Teague Research Center

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1 Continuous Commissioning Report for the Teague Research Center Building #445 Submitted to: Utilities Energy Office Physical Plant Department Texas A&M University Prepared by: Energy Systems Laboratory 03/31/2006

2 Executive Summary The building assessed in this report is the Teague Research Center. It is a five-story building (including basement) consisting of offices, labs, and classrooms located on the main campus of Texas A&M University. The HVAC system is a dual duct VAV with terminal reheat, and incorporates 7 air handling units. Four AHUs are DDC controlled by Siemens; the other three AHUs are pneumatically controlled. There are 2 DDC controlled chilled water and 2 pneumatically controlled hot water pumps located in the Computer Services Addition (building #517) that serve both buildings. The Continuous Commissioning measures that were implemented include optimization of chilled water valve controls on AHU 2-1 and AHU 3-1. These measures were implemented in the time period between October 2005 and March Furthermore, several measures were proposed that have yet to be implemented, including the installation of a chilled water inline booster pump for a basement lab and motion sensors to control lighting. It is hoped that these measures will be implemented soon to complete this phase of the Continuous Commissioning process for this building. It is estimated that implementation of the proposed Continuous Commissioning measures would result in an additional $9100 per year savings. It is recommended that these measures be implemented so that the maximum amount of savings can be achieved.

3 Acknowledgements The Continuous Commissioning (CC ) process detailed in this report was a collaborative effort among the Energy Office, Area Maintenance, and the Energy Systems Laboratory at Texas A&M University. Many persons from each entity are responsible for the work done in the building, from the field and comfort measurements and CC measures determination, to the maintenance and controls items implemented. This document is designed to serve as a deliverable from the Energy Systems Laboratory to the Energy Office, and primarily details the CC activities and measures in which the Energy Systems Laboratory has been involved. For information concerning the Office of Energy Management please contact Homer L. Bruner, Jr. at (979) The lead CC investigator for this building was Hui Chen. For additional information regarding the information in this report or the overall Continuous Commissioning program at the Energy Systems Laboratory, please contact Song Deng at (979) i

4 Table of Contents I. Introduction... 1 II. Facility Information... 1 A. General Building Description... 1 B. HVAC & Lighting Description... 2 III. Continuous Commissioning Activities... 4 A. Existing Building Conditions (Pre-CC) Existing HVAC Conditions Existing Comfort/Indoor Air Quality Conditions... 4 B. Continuous Commissioning Measures Implemented Measures Proposed Measures... 5 IV. Requested Action... 5 V. Savings Analysis... 6 VI. Retrofit Recommendations... 6 VII. Conclusions...6 Appendices... 7 ii

5 List of Figures and Tables Figure 1. Teague Research Center... 1 Figure 2. Teague Research Center location Table 1. Building pumping information Table 2. HVAC system airflow design information Table 3. Implemented CC measures...5 Table 4. Proposed CC measures...6 iii

I. Introduction Since 1997, more than 70 TAMU - College Station buildings have been commissioned, resulting in energy savings to the University of millions of dollars.

6 I. Introduction Since 1997, more than 70 TAMU - College Station buildings have been commissioned, resulting in energy savings to the University of millions of dollars. For the fiscal year 2006, 25 buildings (totaling 2.5 million square feet) have been identified to be commissioned, of which the Teague Research Center is the twelfth. This building was identified as a prime candidate due to its high energy cost per square foot. Commissioning began in October 2005 and was completed in March II. Facility Information A. General Building Description Figure 1. Teague Research Center. 1

7 Figure 2. Teague Research Center location. The Teague Research Center, pictured above in Figure 1, was constructed in 1967 and is located on the main campus near the O & M building (see Figure 2 above). It is home to Computer & Information Services It consists primarily of offices and classrooms. The building has five floors (including basement) for a total area of 63,515 square feet. It is generally occupied during regular weekday hours, with some occupancy in nights and weekends. B. HVAC & Lighting Description The chilled water system in the building utilizes 30 hp, 1300 gpm pumps, one constant speed and one with VFD, both run by EMCS control. The pump with VFD is DDC controlled by pressure differential. The chilled water piping system is two-way variable speed flow loop without bypass. The heating water system utilizes two 15 hp, 800 gpm constant speed pumps with pneumatic control. The hot water piping system is two-way constant speed flow loop with bypass. A summary of the building pumping information is shown below in Table 1. 2

8 Table 1. Building pumping information. CW System HW System Number of pumps 2 2 Pump control source APOGEE Local Pneumatic Pump speed control VFD Constant Pump speed control method DP Bldg Valve control method DP DT Piping system type Two-way variable speed flow loop without bypass Two-way constant speed flow loop with bypass Control valve type DDC Pneumatic Nameplate GPM Nameplate Head (ft) Nameplate HP Nameplate RPM The HVAC system in the building operates with two different duct and control systems, and consists of seven air handling units. For the three AHUs located in the basement, the HVAC system is single duct VAV with reheat and the control system is pneumatic control. The other four AHUs operate a dual duct VAV system and the controls system is DDC, powered by Siemens. The original building design had 36 exhaust fans in the building to vent fume hoods in labs. These lab spaces were remodeled and are now classrooms and offices. Of the original fans, 9 were removed and only 5 are in use. The total design supply flow in the building is 91,140 cfm. Table 1 below gives an overview of the units comprising the building HVAC system with their design information. Table 2. HVAC system airflow design information. Building Name: Teague Research Center Total Area: 63,515 ft^2 Unit Function Service Supply cfm Outside Air cfm Exhaust cfm Note AHU B-1 Supply Neutron Generator AHU B-2 Supply Service Corridor AHU B-3 Supply Basement AHU G-1 Supply Ground Floor AHU 1-1 Supply First Floor AHU 2-1 Supply Second Floor AHU 3-1 Supply Third Floor The lighting system in this building is composed of T8 lamps on all floors. 3

9 III. Continuous Commissioning Activities A. Existing Building Conditions (Pre-CC) 1. Existing HVAC Conditions At the time commissioning began, the chilled water valves on AHU 2-1 and AHU 3-1 were found to be operating at 100% flow. The discharge temperatures were 44.7 ºF and 44.2 ºF, respectively. The discharge temperature set point in APOGEE for both AHUs is 55.8 ºF. However, both chilled water valves were in the fully open position. Inspection proved that the valves were operating correctly. There was a discrepancy in the value requested by the control program and the value received in the field for valve position. The chilled water valve controllers on each of the 3 AHUs were not operating correctly when the commissioning process began. For AHU B-1 and AHU B-2, the controllers were not functioning properly. The controller on AHU B-3 was out of range, and did not match the ranges specified in the control program. 2. Existing Comfort/Indoor Air Quality Conditions At the time commissioning began, the overall building indoor air quality was found to be good. B. Continuous Commissioning Measures 1. Implemented Measures Table 3. Summary of implemented CC measures in building. Category CC Measure Result AHU Optimization of AHU 2-1 and AHU 3-1 DDC controls CHW savings; Improved comfort To resolve the problems described in the previous section, a Continuous Commissioning measure was implemented in the building. Table 3 above is a summary of the Continuous Commissioning measure that has been implemented in this building. The implemented measure was the optimization of the DDC for the chilled water valves on AHU 2-1 and AHU 3-1. This was done to match the AHUs with the scheduling for discharge temperature setpoints. The result of this measure was that the valve operation control was altered by Siemens to ensure that the controller on APOGEE and the actual valve position agreed. 4

10 2. Proposed Measures Table 4. Summary of proposed CC measures that have not been implemented in the building and their estimated potential savings. Category CC Measure Purpose Estimated Potential Savings Pumping Lighting Install inline pump on CHW loop Install motion sensors in training center, conference rooms, restrooms and study lab Energy savings for reduction in main CHW pump usage; provide require gpm to chiller Energy savings in lighting in occupied spaces only $8,400/year $700/year Several Continuous Commissioning measures are proposed that for various reasons have not been implemented. Table 4 above is a summary of the Continuous Commissioning measures that have not been implemented in this building with a rough estimate of how much each measure would save if implemented. Their implementation will complete this phase of Continuous Commissioning for this building and will correct the remaining problems with building performance. One of the proposed measures is installation of a 0.5 hp inline booster pump on the CHW loop. Its purpose will be to provide the chillers in the ground floor labs with the necessary flow requirements of 3 gpm. This measure will result in a reduction in the differential pressure requirement for the main 30 hp chilled water pump for that loop which is located in the Teague Computer Services Addition (building #517). The other proposed measure is to install motion sensors in the training center, conference rooms, restrooms and study lab in order to reduce energy costs due to lighting unused spaces. IV. Requested Action Maintenance issues that were noticed in the building that need attention include chilled water valve controllers on AHU B-1 and AHU B-2 being replaced, the preheat valve on AHU B-2 leaking through, the preheat controller for AHU B-2 is not working, all basement air filters are dirty, and the outside air damper solenoid for AHU B-2 is not functioning and needs to be replaced. For a summary of these deferred maintenance issues, see the table in Appendix A. 5

11 V. Savings Analysis At this point in the commissioning process, post-cc data is unavailable and thus savings cannot be determined. These values will be given at a later date by the ESL data analysis group. It is estimated that implementation of the proposed Continuous Commissioning measures would result in a $9,100 per year savings. VI. Retrofit Recommendations No major building retrofits are recommended at this time. VII. Conclusions The Teague Research Center has been a part of the A&M system since High energy consumption in the building made it a good candidate for Continuous Commissioning. The process was performed over a period of five months. It is believed that the measures that have been implemented up to this time will save on energy costs, in addition to improving comfort in the building. If the proposed measures are implemented, it is estimated that an additional $9100 per year can be saved and the remaining comfort issues can be resolved. Better energy efficiency will occur in the building, as well as, an increase in the productivity of occupants who will be more comfortable in their working environment. A list of deferred maintenance issues that need to be resolved has been generated. It is recommended that the proposed issues be resolved and the proposed measures be implemented to maximize the value of the Continuous Commissioning of this building, and most importantly, to maximize energy savings and comfort levels in the building. In this way, the Texas A&M University campus can move forward in its quest for energy efficiency and the Continuous Commissioning process will have been beneficial in aiding in this endeavor. 6

12 Appendices 7

13 Appendix A: Summary of deferred maintenance issues in building at time of CC. Issue Replace leaking preheat valve on AHU B-2 Replace stuck chilled water valve on AHU B-2 Replace chilled water controllers on AHU B-1 and AHU B-2 Replace air filters on AHU B-1, AHU B-2, and AHU B-3 Replace outside air solenoid in panel for AHU B-2 Status Pending. Pending. Pending. Pending. Pending. 8

Advantages of Financing Continuous Commissioning As An Energy Conservation Retrofit Measure

Advantages of Financing Continuous Commissioning As An Energy Conservation Retrofit Measure Guanghua Wei, P.E. Malcolm Verdict, C.E.M Joseph T. Martinez Energy Systems Laboratory, 3581 TAMU Texas A&M University