Whole Building Assessment Initiative

Transcription

1 Gaudet Middle School Middletown, Rhode Island Prepared for NATIONAL GRID Prepared by B2Q Associates, Inc. Beverly, MA Whole Building Assessment Initiative Revision Date 8/24/2010

2 5 Arrowhead Lane Beverly, MA Whole Building Energy Assessment Gaudet Middle School, Middletown, RI National Grid Whole Building Assessment Initiative Executive Summary... 3 Facility Description... 4 Utility Data and Benchmarking... 7 Electricity End-Use Reconciliation Estimate Energy Efficiency Measures for Further Study Energy Efficiency Measure Table Additional Information on Energy Efficiency Measures Recommendations Not Included in Summary Table Next Steps Appendix A Energy Use Patterns Appendix B Statement of Energy Performance Appendix C Images Appendix D Building Equipment Whole Building Energy Assessment Gaudet Middle School Page 2

3 Executive Summary Gaudet Middle School National Grid's "Whole Building Assessment Inititive" is an energy efficiency initiative which takes a holistic approach to reducing energy consumption and costs. The WBA Program provides customers with an array of potential energy efficiency projects and an action plan which utilizes incentives offered by National Grid. Potential projects feature many no- and low-cost measures which can be implemented quickly and typically have payback times of less than one year. Other projects are suggested where the energy and cost savings are at a high level and would allow the facility to rapidly recover its investment and generate cash flow. The customer's facility is "benchmarked" during the Assessment, a comparison of energy consumption with national averages for the facility type, which can be used to monitor energy reduction after project completion. Mechanical Measures Total Cost $270,810 Financial Highlights Potential Electric Potential Gas Incentive Incentive Net Cost $200 $6,520 $264,090 Project Performance Mechanical Measures Simple Payback (years) Simple Return % Annual Savings $30,320 Monthly Savings $2,527 Annual Energy Use Reduction Mechanical Measures Electricity (kwh) 83,808 Natural Gas (therms) 16,904 Equivalent Source Energy (kbtu) 2,553,591 Mechanical Measures Annual Pollution Reduction Metric Tons Pounds Sulfur Pounds Nitrogen Carbon Dioxide Oxides Oxides Equivalent Carbon Reduction Trees Planted 150 Gallons Gasoline 15,033 Whole Building Energy Assessment Gaudet Middle School Page 3

4 Walk-Through Date: 3/24/10 Address: 1113 Aquidneck Avenue, Middletown, RI Facility Description Building Description This facility is a two-story school and is approximately 140,000 ft 2. This building was built in The school is 100% heated and 80% cooled. It has single-pane glass throughout. Utilities Electric Supply Company: National Grid Electric Distribution Company: TransCanada Electric Rate Code: G2 Gas Supply and Distribution Company: National Grid HVAC Approximately (66) Unit Ventilators (UVs) serve classrooms, library and computer rooms, and have 2- way valves. See Appendix D for Equipment List. (4) Roof Top Units (RTUs) serve Planetarium, Language Labs, and Bradley room (4) Air Handling Units (AHUs) with pneumatic thermostats for gym, heat only (2) AHUs serve upper and lower music rooms, 3-way valves on both; upper music room unit appears to have no fresh air intake (1) AHU in cafeteria designed for ventilation is not used Heating (2) Weil-McLain model 2094 gas-fired hot water boilers, each 6856 MBH max input, 2459 MBH min input, with 5 hp blower motors (2) Baldor Super-E dual temp pumps with alternate run times serve the Hot Water (HW) loop, each 30 hp, controlled by single VSD (has no display reading). These pumps also serve the chilled water loop during the summer. (4) HW zone pumps: (1) 2 hp serves kitchen and cafeteria zone (1) 1 hp serves gym and workshop zone (1) 3 hp and (1) 5 hp serve two classroom zones (1) 20 hp HW pump, serves as backup HW Baseboard (HWBB) in cafeteria (2) York and (1) Trane Split AC/heat Units for language classrooms and Bradley room, estimated 1 to 3 tons each Via UVs, AHUs, and HWBB (2) A.O. Smith Cyclone XHE gas Domestic Hot Water (DHW) heaters (1) A.O. Smith 85 gallon gas DHW heater Cooling (1) McQuay 300 ton air-cooled chiller on roof, 2 screw compressors installed in 2004, served by dual temp pumps (1) York Split System serves planetarium, estimated 5 tons Whole Building Energy Assessment Gaudet Middle School Page 4

5 (3) Sanyo Split AC Units serve the server room and computer rooms Via UVs, AHUs, and RTUs Lighting Most rooms are lighted by fluorescent fixtures with 32 watt T8 fluorescent lamps and standard efficiency electronic ballasts. The gym has fixtures with T5 high output (HO) lamps. Building Automation System (BAS or EMS) Honeywell Enterprise Buildings Integrator software is used to control settings and monitor operation of the boilers and AHUs. The BAS does not control the UVs but indicates whether they are in occupied or unoccupied mode. Other Equipment Approximately (266) computers Gas cooking equipment may be replaced in the near future. Kitchen sprayer appears to be the newer, efficient type. (1) Electric dishwasher booster Air compressor, (2) 1.5 hp compressor motors (4) Vending machines Schedules & Space Capacities Occupancy schedules are as follows: Typical school day: 7:30am 2pm, M F After school activities: 2pm 3pm, M F, 20% occupied Evening activities: 4pm 9pm, 20% occupied Weekend activities: 10am 2pm, Sat., 10% occupied Summer cleaning and camps: 7am 3:30pm, M F Maximum capacity of gym is 1171 occupants Whole Building Energy Assessment Gaudet Middle School Page 5

6 Contacts Customer s Contacts Edward Collins Director of Facilities Management ecollins@mpsri.net National Grid Anita Hagspiel Principal Analyst/ Program Manager anita.hagspiel@us.ngrid.com William Isaksen Energy Efficiency Consultant william.isaksen@us.ngrid.com National Grid s TA Consultants Richard Andelman B2Q Associates, Inc randelman@b2qassociates.com Joshua Doolittle B2Q Associates, Inc jdoolittle@b2qassociates.com Bob Beach B2Q Associates, Inc bbeach@b2qassociates.com Whole Building Energy Assessment Gaudet Middle School Page 6

7 Utility Data and Benchmarking The table below compares this building to a typical benchmark using EPA Portfolio Manager. Portfolio Manager is a Web-based tool supported by the EPA which rates your building against similar buildings. Building Information Performance Ratings $/kwh $/therm $ $1.05 Operating Costs / SqFt EPA Rank (1-100) 2009 Electric $/sqft EPA Bldg Area Occ UnOcc 2009 Fuel Total Building Type Type sqft W/ft2 W/ft2 $/sqft $/sqft Middle School K , $0.92 $0.82 $1.73 Electric and Fuel Use Energy Use Indices Site Source Year Actual Electric kwh Actual Fuel kbtu Norm. Fuel kbtu kwh/sqft Norm. Fuel kbtu/sqft Norm. Facility Total kbtu/sqft National Average kbtu/sqft % Diff National Average kbtu/sqft Norm. Facility Total kbtu/sqft National Average kbtu/sqft % Diff National Average kbtu/sqft ,800 8,415,332 8,616, % % ,400 10,873,981 10,687, % % The terms in the table above are described on the next page. Buildings can apply for an Energy Star Award when they receive a rank of 75 or above. This building would need to reduce energy use by 27% to receive the Energy Star Award. Whole Building Energy Assessment Gaudet Middle School Page 7

8 The following terms are used in the table above: Building type: The type of building being examined. EPA Building Type: EPA Portfolio Manager has a limited number of building types used for benchmarking one building against another. The EPA building type indicates what type of building was chosen to compare this building against. Occ W/sqft: This is the occupied Watts per square foot, which is an indication of how much energy is being used while the building is occupied on a typical day. Unocc W/sqft: This is the unoccupied Watts per square foot, which is an indication of how much energy is being used while the building is unoccupied on a typical day. High levels of unoccupied W/ft2 indicate that equipment is running when there are few people in the building, and may indicate the opportunity to shutoff equipment. EPA Rank: This is the rank of the building in EPA s Portfolio Manager benchmarking tool. The scale is 1 to 100, with an average building ranking a 50. Buildings can apply for an Energy Star Award when they receive a rank of 75 or above. Site and Source: Shown in the table above are the total annual electric and fuel use, and approximate costs per square foot based on average electric and fuel rates. Site and Source benchmark indices are also shown. Site means how much energy is consumed at the site, while Source means how much energy is consumed back at the power plants used to generate the energy, which is then transmitted to the Site. The difference is in the conversion of kwh for Site the conversion is kbtu/kwh, while for Source it is 10.3 kbtu/kwh. Site/Source National Avg. kbtu/sqft: The Site or Source energy intensity (energy use per square foot) this facility would consume if it had an EPA Rank of 50. Actual Fuel kbtu: How much heating energy was used during the year, including gas, oil, propane, and other heating fuels. Measured in kbtu, which is 1000 Btu s, or 1/100 of a therm of natural gas. Norm. Fuel kbtu: The heating energy used during the year, normalized to 30 yr averages based on Heating Degree Days. kwh/sqft: The total electric energy use per year in kilowatt-hours divided by the gross square footage of the building. Norm Site Total kbtu/sqft: The total Site-based energy use of the building, including electricity use and normalized fuel use, divided by the gross square footage of the building. Norm Source Total kbtu/sqft: The total Source-based energy use of the building, including electricity use and normalized fuel use, divided by the gross square footage of the building. Whole Building Energy Assessment Gaudet Middle School Page 8

9 Electric and gas utility data for this facility are shown below: 30,000 25,000 Gas Use Previous and Current Year-to-Date Therms 20,000 15,000 10,000 5,000 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Gas Use 2008 (therms) 16,340 13,857 11,106 7,420 5, ,634 9,381 15,429 Gas Use 2009 (therms) 18,895 21,197 15,890 8,110 2, ,322 9,433 25,364 Month Electric Use and Demand Previous Year and Current Year-to-Date Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Electricity Use 2007 (kwh) 78,600 79,200 79,800 70,800 57,400 58,600 74,600 74,800 76,600 75,600 72,000 83,200 kw Electricity Use 2008 (kwh) 73,800 86,400 70,800 71,200 65,000 81,400 63,600 71,400 76,200 66,800 70,400 79,800 Electricity Use 2009 (kwh) 79,800 76,600 71,400 71,400 66,400 69,800 64,200 58,200 74,000 81,000 79,800 88,800 Electric Demand 2007 (kw) Electric Demand 2008 (kw) Electric Demand 2009 (kw) ,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 0 kwh Whole Building Energy Assessment Gaudet Middle School Page 9

10 Benchmarking Notes: Gas use in the year of 2009 is nearly 20% higher for the entire year than in Gas use in the months of February and December 2009 was more than 50% higher than in those same months in Use in March of 2009 was also notably higher than in March of B2Q was informed that the main gas meter was replaced with a new meter in January of It may be possible that metering issues were the cause of the increased use in 2009, however B2Q cannot confirm that within the scope of this report. It should be investigated whether this is indeed the case, or if other factors caused the increased use in Electric demand in the months of September and October is significantly higher than in previous years. There may be good reason for this increased demand, however it may also indicate that cooling equipment is operating into the late fall, and could be set back or shut down. Electricity consumption data displays more consumption during the swing seasons (spring and fall) than is expected for a facility of this type. This may indicate that economizer mode is not operating to fully utilize free cooling during these months. Whole Building Energy Assessment Gaudet Middle School Page 10

11 Electricity End-Use Reconciliation Estimate The chart below estimates the percentage of annual electricity use by each of the resources listed. 7% Lighting 37% 0 HVAC Cooling 27% VAC Fans 4% ug Loads, Misc equip, Kitchen 24% Whole Building Energy Assessment Gaudet Middle School Page 11

12 Energy Efficiency Measures for Further Study The energy efficiency measures (EEMs) recommended for further study are summarized on the next page. This is based on initial discussions and observations, and each will require further detailed study of the systems to ensure that they are compatible with the technologies suggested. Costs and savings estimates for each measure are shown as initial estimates, with further refinement needed through detailed study of the facility. As the opportunities listed here are studied in more detail, additional opportunities may emerge. These initial cost and savings estimates are expected to be within 15% of the final numbers, which will be determined after a detailed study of the facility. Important Note(s): 1. Since a menu of choices is supplied for this report, there is deliberately overlap in costs and savings estimates. This means that there is overlap in the savings estimates if all measures were to be done together. It also means that there are likely economies of scale to be realized by doing multiple projects, and that cost estimates could be lowered. 2. Additional recommendations and explanations are included in the text following the EEM table. Not all recommendations are included in the EEM table because some measures may need more detailed study or are otherwise outside the scope of this preliminary study. 3. All electric and gas rebates included on the following table are estimates and actual incentives need to be confirmed with the utility. Whole Building Energy Assessment Gaudet Middle School Page 12

13 Energy Efficiency Measure Table Utility Rates Electric Rate Gas Rate Results Climate Impact Table Pounds of Pollutants Equivalent Reduced Trees Planted Equivalent Gallons of Gasoline Total Cost $264,090 $0.15 $/kwh Total Savings $30,320 Carbon Dioxide 300, ,033 $1.05 $/therm Simple 8.7 years Sulfur Oxides 295 Nitrogen Oxides 350 Savings Estimate (kwh) Savings Estimate (therms) Savings Estimate ($) Cost Estimate ($) Potential Electric Incentive ($) Potential Gas Incentive ($) Net Cost ($) Simple Payback (years) Energy Efficiency Measure 1 1a No/Low Cost Measures Computer Power Management 13,300 0 $1,995 $500 $0 $0 $ b Schedules, Setpoints, O&M 3, $1,388 $1,000 $0 $0 $1, c Vending Machine Controls 3,200 0 $480 $720 $200 $0 $ d Education & Awareness 17, $3,119 $1,000 $0 $0 $1, Demand Controlled Ventilation (DCV) - Gym 0 3,259 $3,422 $31,720 $0 $4,889 $26, Retro-Commissioning Lite 16,797 2,525 $5,170 $20,400 $3,613 $0 $16, BAS Replacement 45,067 10,874 $18,178 $224,070 $0 $0 $224, Air Sealing/Weatherization 5,039 1,262 $2,081 $5,000 $0 $0 $5, High Efficiency Destratification Fans ,087 $1,045 $7,800 $0 $1,631 $6, Total % of Total 83,808 16,904 $30,320 $270,810 $200 $6,520 $264, % 20% Entries for Measure 1b, Schedules, Setpoints, and O&M, and Measure 3, Retro-Commissioning Light, are not included in column totals since the costs/savings overlap significantly with Measure 4, BAS Install. Depending on which measures are pursued, energy savings calculations and incentive amounts may be adjusted. Depending on the scope of a Retro-Commissioning Lite project, gas incentives may apply. The cost estimate for Measure 6, High Efficiency Destratification Fans, assumes that existing electrical wiring is nearby and that the existing support structure is sufficient for the fans. Otherwise, project costs will likely increase. Electric and gas incentives may be available if the replacement BAS includes new points. Work with your National Grid representative to determine if these incentives apply. Whole Building Energy Assessment Gaudet Middle School Page 13

14 Additional Information on Energy Efficiency Measures 1. No/low cost measures: National Grid is providing guidance on a number of no and low cost measures which can be implemented. Please review the Notebook provided by National Grid. Reviewing these measures and educating personnel can provide immediate energy savings and improve comfort throughout the buildings. In addition, the following no/low cost measures are recommended: a. Computer Power Management: Power Management features are standard in Windows and Macintosh operating systems, and can place monitors and computers into a low-power sleep mode after a period of inactivity. Touching the mouse or keyboard wakes the computer and monitor almost instantly. There are many ways to activate sleep features across entire networks of computers, including free solutions that utilize open source software and/or tools that you may already have at your disposal. Alternatively, a number of commercial software packages offer more feature-rich solutions for a fee, and may deliver more energy savings. To maximize power savings, set computers to enter system standby or hibernate after 30 minutes or less of inactivity, and set monitors to enter sleep mode after 15 minutes or less of inactivity. The lower the time settings, the more energy you save. On laptops, be sure to activate these settings in the AC as well as DC (battery) power profiles. See the Energy Star website for more information at: b. Schedule, Setpoints and O&M Measures: All spaces should have their schedules and temperature setpoints for occupied and unoccupied periods reviewed and tightened in the BAS. See Appendix A for more detailed information about energy use patterns and electric loads. Check all copiers, personal appliances, printers, etc. and ensure they are set to power down to their standby or energy saving modes when not in use. Create a preventative maintenance (PM) program, to systematically check and manage the following items: Adjust Belts Fix Refrigerant Leaks Clean Condenser Coils Maintain Cabinet Integrity Clean Evaporator Coils Maintain Outside Air Dampers Clean Filters Check Airflow Check Refrigerant Charges Maintain Fans Maintain Condenser Fans and Seal Ducts Motors Whole Building Energy Assessment Gaudet Middle School Page 14

15 Incorporating a quality PM vendor will keep equipment running smoothly and efficiently, and identify potential problems early on. c. Vending Machine Controls: These controls will power down the vending machine including lights and refrigeration whenever there is no foot traffic in front of the machine for a period of time. This is done through the use of a motion sensor. The controls periodically power up the refrigeration system to maintain product temperature and to sense machine operation so that the machine is only powered down when the compressor is not operating in order to prevent adverse impacts on compressor life. d. Education and Awareness: This measure is geared towards teaching occupants about their impact on energy use and energy efficiency and is more community focused than the other recommended measures. This is a people-driven facility, and educating the people who use it about energy efficiency and raising their awareness about how they can individually make a positive impact can go a long way towards reducing energy consumption. National Grid can assist your facility in implementing this measure. Action Items: Utilize internal IT staff for Computer Power Management Utilize internal facilities staff for Schedule, Setpoints, and O&M Arrange for self-install of Vending Machine Controls Work with National Grid to create an Education and Awareness Program 2. Demand-controlled ventilation (DCV) in the Gym: DCV is a control strategy that adjusts the quantity of outdoor ventilation air supplied to a zone based on the number of occupants and the ventilation rate required to provide adequate indoor air quality. Designers often design HVAC systems for the maximum number of occupants in a space, however these spaces are rarely used to full capacity. For areas with highly fluctuating occupancy characteristics, a significant amount of heating and cooling energy can be saved by applying the right amount of ventilation air to satisfy the ventilation requirements. Typically CO2 sensors are used to indicate the occupancy levels, and the amount of ventilation air required. Action Items: Contact B2Q or other qualified vendor to implement this recommendation 3. Retrocommissioning (RCx) Lite: RCx is the process of systematically going through the building to determine whether equipment is functioning correctly, and then recommending and implementing no or low cost measures which can be implemented to improve energy efficiency and reduce maintenance costs. During the site visit, we sampled equipment and found that, in general, there is opportunity for adjusting equipment operations and improving energy efficiency. Below is a list of items which can be addressed, many at no or low cost. a. All spaces in the building need to have their schedules and temperature setpoints reviewed, to tighten the occupied and unoccupied periods and setpoints. Whole Building Energy Assessment Gaudet Middle School Page 15

16 b. Examples of potential problems are mentioned below: i. The HW loop temperature was noted to be 134 o F, when the Outside Air (OA) temperature was 64 o F, although heating system enable setpoint was noted to be 55 o F in the BAS. The heating system should have been disabled at this OA temperature. This may indicate a bad sensor or sequence error in the system, and may be wasting energy by causing the boilers to run when they should not be. ii. There were no winter holidays set in the BAS schedule. It may be that facilities staff manually sets the equipment back during these times, however, this may also indicate that equipment may be running when the building is unoccupied, wasting energy. iii. The Chilled Water (CHW) temperature was noted to be 105 o F. This may indicate a poorly place temperature sensor, as the chiller should be valved off. iv. It was unclear from the BAS whether the VFD modulation and the bypass valve modulation were properly synched. If they are out of synch, the bypass valve could be modulating long before the VFD ramps down the pump speed. This can lead to wasted energy, as the VFD should be ramping down but is not. c. Optimal start/stop is an algorithm which optimizes the start and stop time of equipment, so that units are automatically turned on to bring space temperatures to their setpoints only at the time needed, rather than starting or stopping on a fixed schedule. Optimal start/stop strategies should be implemented into the Building Automation System (BAS). d. As part of the RCx process, building facility staff should be trained on the use of the Building Automation system to utilize the system to its maximum potential. This is extremely important, as it will help staff monitor and diagnose equipment, as well as optimize the runtime of equipment and the overall energy use of the building. e. One immediate RCx measure is to perform a walk-through during unoccupied periods to audit equipment which is operating even though it should be turned off during these periods. f. Upgrade BAS software to the latest version. Up to date software adds advanced control strategies such as optimal start/stop, seven day scheduling, water loop temperature reset, reliable economizing based on enthalpy calculations, etc. New software is also Web-based and accessible via an Internet Browser by anyone authorized. This allows facility managers to easily check on systems or make changes from remote locations if alarms (problems) are generated and sent to their cell phones. A software update would greatly help with existing scheduling issues, saving significant energy. Refer to EPO data in Appendix A for more details. Please note that the cost of implementing this measure has not been included in the Energy Efficiency Measure Table above. Whole Building Energy Assessment Gaudet Middle School Page 16

17 g. Take advantage of trending BAS points over time to view how equipment behaves over several weeks. Often examining a point (temperature, humidity, etc) requires seeing how that information behaves over a period of time. By setting up trends on all the equipment in the building, at any point in time facility staff can review how that equipment has been behaving over the past several weeks, and determine if there is now a problem. No trends are currently set up. h. Air balancing is the process of measuring and adjusting the airflow to the needs of the occupants and should be performed as a part of the RCx process. Having balanced system airflow is important to maintaining the overall effectiveness and efficiency of equipment. An indication of an unbalanced system is the occurrence of noticeable temperature differences in adjacent areas, which forces the HVAC system to use more energy in an attempt to accommodate temperature setpoints in these areas. We recommend spot testing to determine if the HVAC system has unbalanced airflow. Please note that the cost of implementing this measure has not been included in the Energy Efficiency Measure Table above. i. Take pictures using an infrared camera to identify areas where heat loss is occurring in the building shell and equipment. Target suspected problem areas, windows, exterior doors, plenum ductwork, and exhaust vents (when dampers are closed). Action Items: Incentives for RCx Studies are available from National Grid. Determine if these incentives apply Contact B2Q or other qualified vendor for implementation of this recommendation 4. Building Automation System (BAS) Replacement: A new front-end BAS for the entire building will greater provide user-friendly control over the HVAC equipment throughout the building, including boilers, pumps, chillers, etc. The object of a BAS is to provide an optimal level of control of occupant comfort while minimizing energy use and operating costs. The BAS would add advanced control strategies such as optimal start/stop, seven day scheduling, water loop temperature reset, reliable economizing based on enthalpy calculations, etc. The system would be WEB-based and accessible via an Internet Browser by anyone authorized. This would allow facility management to easily check on systems if alarms (problems) are generated and sent to their cell phones, or make changes from remote locations as needed. A BAS would have the ability to monitor energy usage, including electricity, gas, oil and water use. This gives the facilities staff better control of the building s energy use and enables them to trend or track BAS points over periods of time to compare current equipment function to past data. The BAS also provides staff with specific information on how the equipment is functioning for maintenance purposes. Facilities staff indicated that the existing BAS did not give the desired level of control over HVAC equipment. Additionally, the existing BAS is a proprietary system that only the installation company can work on, which limits competitive pricing for maintenance and further system expansion. Whole Building Energy Assessment Gaudet Middle School Page 17

18 Please note that the costs and savings of a BAS Install overlap significantly with a Retrocommissioning (RCx) effort. As a result, only the costs and savings of a BAS Install have been included in column totals in the Energy Efficiency Measure Table above. Action Items: Contact B2Q or other qualified vendor to implement this recommendation 5. Weatherize Building Envelope: This measure is to increase the heat retention of all spaces in the facility by improving door and window seals, and eliminating conditioned air leakage. Typical weatherization measures include caulking gaps and joints, weatherstripping outside doors and access panels, and air-sealing air handling units and ducts. During our walkthrough we noticed several spaces with air leakage problems. Action Items: Contact B2Q or other qualified vendor to implement this recommendation 6. High Efficiency Destratification Fans in Gym: Consider installing these fans on the gym ceiling. Destratification fans help to circulate the air in a large space to maintain an even temperature throughout. Warm air rises, and can get trapped near the ceiling, away from the space temperature sensors. This can lead to heating and ventilating units working harder to heat the space, because the sensors are reading the lower temperature air near the floor even though there is plenty of warm air in the space. By helping to mix the air in the space better, these fans help minimize unnecessary load on the equipment serving this space. Action Items: Contact B2Q or other qualified vendor to implement this recommendation Whole Building Energy Assessment Gaudet Middle School Page 18

19 Recommendations Not Included in Summary Table 1. Price Response: Consider enrolling in the Price Response program. This involves taking steps to reduce your electric demand, or shed load, based on the current price of electricity. Customers enrolled in this program receive credit for each kw of load that can be shed. New BAS systems can incorporate demand reduction strategies so that load can be easily shed through the control system. Typical load shedding measures include raising the chilled water temperature, raising cooling setpoints, turning off lights, and setting VFDs to minimum speeds. 2. Window Upgrade: The school currently has single-pane windows throughout the entire building. Consider replacing all of the existing windows with double-pane windows. Single-pane type of window is inefficient because there is only one layer of glass as a barrier between outside weather conditions and conditioned air inside of the building. Double-pane windows have two layers of glass, plus one layer of air between the glass panes for much greater insulation than single-pane windows. This should be considered as part of a capital replacement plan. Contact National Grid regarding incentives before purchasing and installing new windows. 3. Replace Kitchen Equipment: Facilities staff indicated that the school was considering replacing some of the gas cooking equipment in the kitchen. When planning for this upgrade, consider purchasing high efficiency cooking equipment. National Grid offers incentives of up to $1,000 each for high efficiency equipment such as deep fryers and ovens. Contact National Grid regarding incentives and eligibility before purchasing the new equipment. 4. Replace Old Unit Ventilators in classrooms: replace older unit ventilators in the classrooms with new units. Several of the units appear to be more than 30 yrs old and are in need of replacement with new units. This should be done as part of a planned capital replacement of the units. Contact National Grid regarding incentives before purchasing Unit Ventilators. 5. Lighting Upgrades: National Grid offers incentives for upgrading existing lighting to more efficient lighting fixtures. In addition, there are a number of lighting control strategies that can be used to reduce energy consumption. We recommend the following upgrades and control strategies for further investigation: a. Lighting Occupancy Sensors: Occupancy sensors can reduce unnecessary energy use by performing the duties of turning lights in an area on and off when they sense someone entering or leaving an area. Areas that are good candidates for occupancy sensors are those that are used infrequently or unpredictably, such as classrooms, private offices, conference rooms, storage rooms, and bathrooms. This facility has several of these types of areas, most notably the classrooms and corridors. 6. Green your building by enrolling in the LEED EB O&M rating system: A sustainable building maximizes operational efficiency while minimizing environmental impacts. As a cutting-edge, consensus-based system for certifying green building performance, operations and maintenance, the LEED for Existing Buildings: Operations & Maintenance (O&M) Rating System provides a road map for property managers, Whole Building Energy Assessment Gaudet Middle School Page 19

20 portfolio owners and service providers who wish to drive down operating costs while increasing occupants productivity in an environmentally responsible manner. The LEED for Existing Buildings: O&M Rating System is a set of voluntary performance standards for the sustainable ongoing operation of buildings. It provides sustainability guidelines for building operations, periodic upgrades of building systems, minor spaceuse changes, and building processes. It is intended to provide existing buildings an entry point into the LEED certification process. LEED for Existing Buildings: O&M certification is based on actual building operating performance, not design expectations. The certification application must provide data demonstrating that the building s operations meet the LEED for Existing Buildings: O&M prerequisites and attempted credits. The performance of the entire building must be included in measurements and calculations; tenant spaces may not be excluded. LEED for Existing Buildings: O&M addresses building exterior and site maintenance programs, efficient and optimized use of energy and water, the purchase of environmentally preferred products and food, waste stream management and ongoing indoor environmental quality. In addition, LEED for Existing Buildings: O&M provides sustainability guidelines for whole-building cleaning and maintenance, recycling programs and systems upgrades to improve building energy performance, water consumption, indoor environmental quality and materials use. Action Items: Contact B2Q for more information on improving sustainability and certifying your building through the USGBC LEED EB O&M process See for more information. Whole Building Energy Assessment Gaudet Middle School Page 20

21 Next Steps Immediately implement no/low cost measures Determine objectives and level of interest to proceed with detailed study Contact NGRID to review opportunities and begin detailed audit of opportunities. B2Q is available to assist with the implementation of any selected measures. Detailed report reviewed Implementation of recommended measures Please feel free to contact us if you have any questions. Sincerely, Bob Beach Joshua Doolittle Richard Andelman, PE, CEM, CBCP Whole Building Energy Assessment Gaudet Middle School Page 21

22 Appendix A Energy Use Patterns A summary of the annual electricity demand and consumption is shown in the table below, and in more detail on the following page. This information is from account , and represents a period of one year from January 1 December 31, Energy Usage Table 2009 Total Energy Usage ( kwh) 893,011 Total Weekday Energy Usage ( kwh) 726,174 Total Weekend Energy Usage ( kwh) 166,837 Weekday Maximum Demand ( kw) 392 Weekend Maximum Demand ( kw) 144 On-Peak - Total Energy ( kwh) 502,245 Off-Peak - Total Energy ( kwh) 390,766 Weekend vs weekday demand 37% Weekend vs total energy use 19% Weekday vs total energy use 81% It can be seen in the table above that the weekend energy use is approximately 19% of the total energy use. This is slightly higher than is typically expected for a school. There may be good reason for this weekend use such as theater or sporting events, however this may also indicate that some equipment is running on the weekend that can be shut down or set back. Whole Building Energy Assessment Gaudet Middle School Page 22

23 The 2D demand graph on the following page is a graphical representation of when peak periods are occurring at the facility. The X-axis shows the day of the year, and the Y-axis shows the hour of the day. The colors of the graph indicate the range of electricity demand (kw), with each corresponding range identified by the legend at the top of the graph. Similar to a topographical map, each band can be thought of as a contour line of electricity demand. The dark bands in the graph depict times when the demand is equal to or less than the lower end of the kw scale. Occupied building schedules can be identified from this graph as the bands of color between approximately 7am and 3:30pm. It can be seen that demand on a typical school day is approximately 250 kw and lower. It can also be seen that demand is often at least 100 kw for most of the winter months until 12am, which is greater than one-third of the demand during a typical school day when the building is fully occupied. There may be good reason for this demand, such as night classes or activities, however this may also indicate that equipment is running when the building is not fully occupied and can be shut down or set back. Whole Building Energy Assessment Gaudet Middle School Page 23

24 12/2 27/ /1 18/ //9/ /3 30/ /2 21/ /1 12/ //3/ /2 25/ /1 16/ //7/2009 9/2 28/2009 9/1 19/ /1 10/2009 9//1/2009 8/2 23/ /1 14/2009 8//5/2009 7/2 27/ /1 18/2009 7//9/2009 6/3 30/2009 6/2 21/ /1 12/2009 6//3/2009 5/2 25/ /1 16/2009 5//7/2009 4/2 28/ /1 19/2009 4/1 10/2009 4//1/2009 3/2 23/2009 3/1 14/2009 3//5/2009 2/2 24/2009 2/1 15/2009 2//6/2009 1/2 28/2009 1/1 19/2009 1/1 10/2009 1//1/2009 Gaudet Middle School 2D Map 2009 kw :15 20:15 18:15 16:15 14:15 12:15 10:15 8:15 6:15 4:15 2:15 0:15

25 The graph below shows the following: Green peak annual energy demand. 9/24/2009 Red average annual weekday demand. Blue average annual weekend demand. Maroon Swing Season day (4/20/2009) shown for example It can be seen from this graph that the demand profile on a swing season day is very similar to the average weekday demand profile. It can also be seen that the demand on the peak day shows sharp increases and drops in short periods of time. This may indicate that a lot of cooling equipment is coming on at the same time such as the chiller, pumps, and RTUs. Demand limiting features that can be incorporated into a new BAS can help to minimize these sharp demand peaks. The graph also shows that the baseline demand of approximately 70 kw is about one-third of the average annual weekday (occupied) demand at noon of approximately 210 kw. This is higher than expected for this type of facility and indicates that there is potential to reduce the baseline demand. Selected Date Range Thursday, January 01, 2009 Through Thursday, December 31, 2009 Whole Building Energy Assessment Gaudet Middle School Page 24

26 The load duration curve is a plot of the percentage of time that this building s load is at various demand levels. For example, on a downward sloping curve, the demand at a 10% level would indicate that the demand is at or above that level for 10% of the time. A curve with a steep section at the beginning, such as this one, would be indicative of a load profile that spends very little time at high or full load, and a flat curve would indicate that there is very little variation in load over time. This plot is useful in identifying the potential for load reduction. We plotted this curve for period of one year, as described in the Energy Use Table above. The data from this curve shows that the load is below approximately 220kW for approximately 95% of the time. It appears that there is a significant opportunity for load reduction, as evidenced by the difference between the peak of nearly 400kW and the 5% load of approximately 220kW. This is a very steep load duration curve and it would be possible to shed load using demand limiting control strategies available with a BAS upgrade. Selected Date Range Thursday, January 01, 2009 Through Thursday, December 31, 2009 Whole Building Energy Assessment Gaudet Middle School Page 25

27 Appendix B Statement of Energy Performance Whole Building Energy Assessment Gaudet Middle School Page 26

28 OMB No STATEMENT OF ENERGY PERFORMANCE Gaudet Middle School Building ID: For 12-month Period Ending: December 31, Date SEP becomes ineligible: N/A Date SEP Generated: May 06, 2010 Facility Gaudet Middle School 1113 Aquidneck Ave Middletown, RI Year Built: 1968 Gross Floor Area (ft 2 ): 140,000 Facility Owner N/A Primary Contact for this Facility N/A Energy Performance Rating 2 (1-100) 42 Site Energy Use Summary 3 Electricity - Grid Purchase(kBtu) 3,279,614 Natural Gas (kbtu) 4 10,874,000 Total Energy (kbtu) 14,153,614 Energy Intensity 5 Site (kbtu/ft 2 /yr) 101 Source (kbtu/ft 2 /yr) 160 Emissions (based on site energy use) Greenhouse Gas Emissions (MtCO 2 e/year) 986 Electric Distribution Utility National Grid - Narragansett Electric Co National Average Comparison National Average Site EUI 95 National Average Source EUI 150 % Difference from National Average Source EUI 7% Building Type K-12 School Stamp of Certifying Professional Based on the conditions observed at the time of my visit to this building, I certify that the information contained within this statement is accurate. Meets Industry Standards 6 for Indoor Environmental Conditions: Ventilation for Acceptable Indoor Air Quality N/A Acceptable Thermal Environmental Conditions N/A Adequate Illumination N/A Certifying Professional N/A Notes: 1. Application for the ENERGY STAR must be submitted to EPA within 4 months of the Period Ending date. Award of the ENERGY STAR is not final until approval is received from EPA. 2. The EPA Energy Performance Rating is based on total source energy. A rating of 75 is the minimum to be eligible for the ENERGY STAR. 3. Values represent energy consumption, annualized to a 12-month period. 4. Natural Gas values in units of volume (e.g. cubic feet) are converted to kbtu with adjustments made for elevation based on Facility zip code. 5. Values represent energy intensity, annualized to a 12-month period. 6. Based on Meeting ASHRAE Standard 62 for ventilation for acceptable indoor air quality, ASHRAE Standard 55 for thermal comfort, and IESNA Lighting Handbook for lighting quality. The government estimates the average time needed to fill out this form is 6 hours (includes the time for entering energy data, PE facility inspection, and notarizing the SEP) and welcomes suggestions for reducing this level of effort. Send comments (referencing OMB control number) to the Director, Collection Strategies Division, U.S., EPA (2822T), 1200 Pennsylvania Ave., NW, Washington, D.C EPA Form

29 FOR YOUR RECORDS ONLY. DO NOT SUBMIT TO EPA. Please keep this Facility Summary for your own records; do not submit it to EPA. Only the Statement of Energy Performance (SEP), Data Checklist and Letter of Agreement need to be submitted to EPA when applying for the ENERGY STAR. Facility Gaudet Middle School 1113 Aquidneck Ave Middletown, RI Facility Owner N/A Primary Contact for this Facility N/A General Information Gaudet Middle School Gross Floor Area Excluding Parking: (ft 2 ) 140,000 Year Built 1968 For 12-month Evaluation Period Ending Date: December 31, 2009 Facility Space Use Summary Space Type Middle School K-12 School Gross Floor Area(ft2) 140,000 Open Weekends? Yes Number of PCs 266 Number of walk-in refrigeration/freezer units 2 Presence of cooking facilities Yes Percent Cooled 80 Percent Heated 100 Months o High School? School District o N/A No N/A Energy Performance Comparison Evaluation Periods Comparisons Performance Metrics Current (Ending Date 12/31/2009) Baseline (Ending Date 12/31/2009) Rating of 75 Target National Average Energy Performance Rating N/A 50 Energy Intensity Energy Cost Greenhouse Gas Emissions Site (kbtu/ft2) N/A 95 Source (kbtu/ft2) N/A 150 $/year N/A N/A N/A N/A N/A $/ft2/year N/A N/A N/A N/A N/A MtCO 2 e/year N/A 926 kgco 2 e/ft2/year N/A 7 More than 50% of your building is defined as K-12 School. Please note that your rating accounts for all of the spaces listed. The National Average column presents energy performance data your building would have if your building had an average rating of 50. Notes: o - This attribute is optional. d - A default value has been supplied by Portfolio Manager.

30 Appendix C Images HW boiler, cafetorium, air handling unit, dual temp pumps, gym and 1 of 4 AHUs Whole Building Energy Assessment Gaudet Middle School Page 27

31 Appendix D Building Equipment Total kw kw per per Chiller Nom Tons Nom kw Qty Fans Fan Fan kw Chiller McQuay Pumps Qty Nom Motor HP kw HW HW Zones HW Zones HW Zones HW Zones AHU Serves SF Nom HP SF BHP Fan kw 1 gym gym gym gym offices & halls (total 5) Music Rooms Music Rooms RTU Serves SF Nom HP SF BHP Cool (kw) Fan kw 1 Admin/Offices Planetarium Unit Vent Qty Estimated HP kw each total kw Classrooms Whole Building Energy Assessment Gaudet Middle School Page 28