A step by step guide to operating version1.0:

Transcription

1 : User s Guide Daylight Analysis Tool, Powered by SkyCalc A step by step guide to operating version1.0: Establishing your settings; including labor rates and markups Basic building entry procedures and definitions Description of reports and analysis outputs available List of support materials for reference Getting Started Introduction Welcome to SunLite Calc, the web based daylighting analysis tool specifically for the innovative SunLite Strip series of skylights from Butler Manufacturing. SunLite Calc is powered by SkyCalc, the industry recognized energy calculator developed by Heschong Mahone Group, an independent research and consulting firm specializing in building design, construction technology, policy development and program design. It is our intent that with accurate inputs, you can responsibly promote an effective array of SunLite Strip units on new or retrofit Butler Buildings that feature MR-24, CMR or TLS standing seam roof systems, coupled with effective lighting controls to reduce your clients electric lighting expense while improving the overall building aesthetics, employee productivity and customer satisfaction. SunLite Calc is an online tool accessible through MyBuilderNet.com and is only for Butler Builders and their clients. It can be used on a number of device and web browser configurations, including PCs, Macs, ipads, iphone s, Androids etc. To get started, login to your MyBuilderNet account. While on the main page, you will see the link to SunLite Calc, click there. Please review the disclaimer upon entering the site and click OK to proceed. Page 1

2 User s Guide Once inside, it s best to start by establishing your specific user settings. Before entering your building information, be sure to define your user settings by clicking here. Settings Under settings, you have the ability to define different labor rates and markups for different jobsite conditions, clients, in town vs. traveling crews, etc. in the privacy of your office and not while in front of your client. Note: The unit costs listed represent the STANDALONE unit price for each volume tier, without freight and taxes, and should be used for budgeting Page 2 SunLite Calc User s Guide - Version 1.0 March 2012

3 Recent Projects Project Tab Product Tab : User s Guide purposes only. Pricing may vary and you should always use project specific pricing. Skylight Markup percentage will be applied to the unit prices listed in the Skylight Cost table only. Your install rates defined below should include your markup on labor. Installation rates will vary per project and also by unit description (Upslope, downslope, continuous and stand alone), contact your product specialist for appropriate man hour estimating guidance. When complete, click on Create Markup Code to save your settings. Select Is Default to select the markup code you prefer as the default. SunLite Calc allows the user to save and later search for existing projects. Be sure to name each project something will be distinctive should you need to recall it later. Enter a Project Name and description that will be memorable as you will often have numerous alternates and revisions. When selecting nearest climate, choose one that shares climatic characteristics with your project location. Keep in mind we will be updating the number of cities as we continue to develop this tool. At a minimum you should be able to accurately model a location located within the climatic zones as described by ASHRAE. We ve been told international cities will soon be available as well, we will keep you posted. Click on Create Project when complete. Version 1.0 only features one daylighting option, SunLite Strip so that decision is made for you! Note: By selecting product details, you will expand a window that lists each of the key performance measures for the standard dual glazed, stamped prismatic acrylic lens that SunLite Strip currently features. IF you receive a custom quote for an alternative glazing, DO NOT use SunLite Calc as the results will not be accurate! Contact your product team to see if an alternate version of SkyCalc can be run on demand. Page 3

4 User s Guide For Installation Code, select the desired setting you defined earlier if different than your default setting. Similar to the Product Definition, there is only one unit length to define in version 1.0. We appreciate the field benefits of being able to connect multiple units for each roof penetration, but to begin your model, we ve found it easier to first determine the appropriate amount of daylight you want to achieve and then determine the best layout as your building plans develop. Select Next when complete to advance to the next tab. Note: At several points while entering data for a model, you may experience screens flickering or otherwise transitions from screen to screen that aren t entirely smooth. In most cases you ve done nothing wrong, it s simply the complex calculations taking place behind the scenes, pulling data from a large number of tables. Page 4 SunLite Calc User s Guide - Version 1.0 March 2012

5 : User s Guide Important Note: From this point forward information will be split into two areas; basic and optional. Basic Inputs represent the bare minimum amount of information required to perform an analysis. Optional Inputs are for additional information you may have specific to a project that would vary Building Tab The first selection on the Basic Inputs tab is Building Type. Select from the list the end use that most closely matches your projects. Clearly this list doesn t cover each and every type of building out there. What the authors of the program tried to do was model distinct schedules and intensities of use for people, equipment, lighting, heating and cooling. Next, enter the square footage of the building or section of building you d like to model, followed by eave height. Please keep in mind the calculations in the program assume a simple, one-story rectangular floor plan based upon total floor area. SunLite Calc should only be used to evaluate the daylit areas in the buildings. Rooms or areas of buildings with substantially different uses, configurations, schedules or light levels should be evaluated separately. Building Wall Color (Interior) deals specifically with reflectance of the interior surface so select the one that most closely matches your project. Partition/Shelving Type is an area to communicate obstructions that would interfere with the distribution of daylight. It assumes the obstruction you define runs evenly and consistently throughout your building. Each of these absorb considerable amounts of both daylight and electric light, and the lighting power density calculations are adjusted accordingly. A building which is partially open and partially filled with racks should be evaluated as two separate spaces. You may find that these different spaces produce different energy savings and may require different daylighting designs. Page 5

6 User s Guide Finally, the calculation of illumination levels and lighting power densities for areas with shelving or partitions is a rough approximation based on the Floor Cavity approach of the lumen method. The method loses accuracy as the shelves get higher in proportion to ceiling height. For greater accuracy, we recommend that you use a lighting design program to determine more precise values for lighting power densities for a given illuminance target. These can be entered under the optional inputs tab for Lighting. Optional Inputs- Building The Building section tab, Optional Inputs describes in greater detail the building characteristics that are used in SunLite Calc analysis. Keep in mind that by Building we mean daylit space that is analyzed, which may actually only be a portion of the actual building. As a default, SunLite Calc assumes each building is a single story rectangle twice as long as it is wide. You can override this assumption by revising the building width. The length will be recalculated based upon the overall area of the building. This is also the place to revise ceiling, wall floor and shelving reflectances if you have more accurate values. Lighting Tab This section is asking you to define the existing or proposed electric lighting system and its controls. SunLite Calc calculates a default lighting power density for your system, based on the footcandle setpoint, the fixture type and other building characteristics. The Lighting System pull down menu defines the lighting type for general lighting. Only one system can be modeled at a time. When you select a specific lighting system, it is used to determine amount of lighting power needed to achieve your target illuminance. The pre-defined lighting systems in SunLite Calc are: Open cell fluorescent- deep cell parabolic fixtures containing T-8 fluorescent lamps and electronic ballasts. Lensed fluorescent lensed troffers containing T-8 lamps and electronic ballasts Direct/Indirect fluorescent suspended fixtures with reflector grid, with 39% uplight and 32% downlight, with T-8 lamps and electronic ballasts Indirect fluorescent suspended luminous bottom indirect fixtures 66% up light and 12% downlight with T-8 lamps and electronic ballasts Page 6 SunLite Calc User s Guide - Version 1.0 March 2012

7 : User s Guide Industrial fluorescent industrial strip fixtures with a porcelain enameled reflector, T-8 lamps and electronic ballasts High Bay Metal Halide high bay intermediate distribution ventilated reflector with clear metal halide lamp and magnetic ballasts Low Bay Metal Halide low bay lensed bottom reflector unit with a clear metal halide lamp and magnetic ballasts High Bay HPS Same as High Bay Metal Halide but with clear HPS lamp Low Bay HPS same as Low bay Metal Halide except with clear HPS lamp Note: These are the standard lighting types modeled in SkyCalc, it is likely that we will add to this list in future releases. However, if you would like to model a different lighting system, the original version of SkyCalc allows for user defined systems. You will need specific light distribution metrics including lumen intensities. The format of this table and the source for more data for other fixture types can be found on page 443 of the 8 th Edition of the IESNA Handbook. Your product teams can work with you to input these values into the public version of SkyCalc for your use. You can also select View Systems to see an example of each type. Click on View Systems again to return to Basic Input mode. Lighting Setpoint is expressed in footcandles and is a critical input to your calculations as it triggers your lighting controls to adjust or turn of lighting once this desired level is reached. We ve included a Rules of Thumb chart with some basic parameters often seen for lighting setpoint per building end use, that can be accessed by clicking on the i button (see below). Page 7

8 User s Guide Select the i button to expand the Lighting Setpoint Rules of Thumb Light Fixture Height is expressed as an average height given the rise in slope of your building. Lighting Controls are without doubt as essential to your electric lighting savings as the skylights, because if you won t see savings unless the lights turn off. That said, SunLite Calc has an extensive list of pre-defined lighting controls. The list has two sections: Switching Controls, which are common to all lighting technologies and Dimming & Hi/Lo Ballasts, which are specific to a certain type of lighting technology. Therefore you ll notice that your choice of controls may vary depending on the type of lighting system. The Lighting Controls pull down menu selects the lighting control strategy. The Lighting Control Graph below the pull down menu illustrates the relationship between the lighting power required by the electric lighting system and the available daylight inside the building for the selected control strategy. It also indicates the current illumination target measured in footcandles. Note: One of the options in the pull down menu is No Lighting Controls. This allows you to illustrate just the heating and cooling energy impacts of skylights without controls. Page 8 SunLite Calc User s Guide - Version 1.0 March 2012

9 : User s Guide The Lighting Control Graph illustrates the relationship between electric lighting power, available daylight and trigger points when lights shut off based on your Lighting Setpoint Optional Inputs- Lighting This section describes the characteristics of the electric lighting system and it s schedule of peration. The operation schedule is important because SunLite Calc assumes that the lighting control system turns down the electric lighting when daylight is available only when the lights are scheduled to be on. The Lighting Power Density, in Watts per square foot, is calculated from the lighting setpoint, the type of lighting system, and the shape and reflectances of the building and it s shelving. We ve included a chart with common lighting power densities grouped by end use for your reference, simply click on the i button. Note: Lighting Power Density is a metric used to qualify for EPAct tax deductions and other incentives. Page 9

10 User s Guide Utilities Tab Task Height describes the height of a horizontal task surface above the floor (such as a desk surface). If the primary activity of the space is walking (such as a lobby) then the task height would be the floor, measured at zero, Retail facilities often consider the task height at eye level, etc. Fraction Lighting Uncontrolled describes the fraction of the ambient lighting system that is not controlled in response to daylight (might be operated on an emergency circuit that leaves them on at all times. Lighting Schedule is the fraction of lighting to be used during a given hour of operations, these can be revised via the lighting schedule pull down menu. Room and Luminaire Depreciation describes the percentage of light that will be available from the electric lighting system in several years time, as compared to light from a new fixture with clean surfaces. This is already accounted for in the program based on the useful life of each lamp technology. SunLite Calc estimates the energy cost savings (or increases) for lighting, heating and cooling and sums them up to give you a net impact that can be expected in the buildings energy costs. SunLite Calc assumes that the buildings electrical lighting and cooling systems use electricity and heating systems also use electricity or other fuels. Enter the average yearly cost of electricity per kwh. This can be found by dividing the total electricity costs on a bill by the total consumption of electricity in kwh for that period. This cost is typically higher than the quoted usage cost per kwh of electricity because it includes other charges, such as peak electrical demand charges. Page 10 SunLite Calc User s Guide - Version 1.0 March 2012

11 : User s Guide Heating Fuel Units pull down menu allows you to specify the cost of heating fuels in units the supplier provides, eliminating the need for unit conversions. Optional Inputs- Utilities The HVAC section describes the operating characteristics of the HVAC system specified on the basic inputs tab. The program models HVAC based on a 1 or a 0 schedule. When the schedule is 1, the specified heating and cooling setpoints are maintained in the space, when the schedule is 0, the setback temperatures apply. You can specify an economizer which brings in outside air to provide cooling when the outside air is cool enough. Results Tab Congratulations, you have completed the required inputs in order to model your building! You ll notice a new area below the previous menu of tabs that display the skylight count, effective skylight to floor %, annual savings and the calculate results button. There are a few things to pay attention to here: Skylight Count this is where you enter the number of unit skylights to model. Next to that is the icon for the unit description pop up window, where you determine the orientation of the total number of units you re modeling. Page 11

12 User s Guide Filling in the unit description box is required before you generate the Payback Analysis report as it relates to the labor amount you ve defined in settings for each type of unit. Keep in mind, the total number of units must match your allotted unit description. Note: Based on the size of your building, there are a minimum number of skylights required for uniform daylight distribution. The analysis provided by this tool requires uniform distribution. If the number you select is less than the number required for uniformity, a red box will appear under the results bar stating the minimum number needed. If you are modeling your facility for a certain ESFR or effective skylight to floor ratio, you can also determine the number of unit skylights by using the slide bar. Page 12 SunLite Calc User s Guide - Version 1.0 March 2012

13 : User s Guide Unsure what % is right for your facility? Click on the i button and refer to the rules of thumb chart grouped by end use. Annual Cost Savings displays the estimated net savings (or loss) of the building you defined and calculated results for. To the right of the savings is the Calculate Results button, which starts the engine that calculates the results of the inputs you ve defined. There s literally hundreds of calculations performed the moment you click! Note: The Annual Cost Savings displayed only refreshes when you Calculate Results, NOT after each change you make. So it s very important that you re-calculate after changes in order to get accurate results. Below the results bar are four reports that have been generated for you each time you calculate results: Table Results, Graph Results, Climate Results and Payback Analysis. Let s look at each report in detail. Table Results Table Results summarizes the key information used to calculate energy savings from skylights in tabular form. This tab also presents the energy and cost savings results for the skylighting system defined from the inputs. Most of the terms have been defined previously in this guide, those specific to this report are: Page 13

14 User s Guide Full Daylighting: the number of hours that the interior daylight levels were above the lighting setpoint. Graph Results Overall Skylight System tvis: The fraction of the light from the sky that leaves the skylight well. It is a product of the VLT (Variable Light Transmission) of the glazing, the well factor, the dirt factor and the safety screen or grid factor. (All of these are predefined for the SunLite Strip and locked in) Skylight CU: The fraction of light leaving the skylight well that reached the work plane, accounting for geometry and interior reflectances. The Savings from Design Daylighting System table itemizes the savings from the proposed skylighting system, as compared to the same building without skylights for lighting, heating and cooling. Note: A negative figure means that the skylighting system will result in more energy used than saved. It s not uncommon for a well designed skylighting system to have negative values for heating and/or cooling, but this is typically overshadowed by substantially higher lighting energy reductions. If the total esfr gets too large, you will experience diminishing returns. These graphs could also be called optimizers in that they depict how close the esfr is to the optimum design condition. With all other variables held constant, they vary the esfr from 0-12%. The resulting performance curve is plotted for both whole building energy savings and dollar value of those savings. The performance fo the proposed design is also indicated. If you were to change the physical characteristics of the skylights, the daylighting control system, energy costs, or details about the building and its operation, then the shape of the curves would change. Page 14 SunLite Calc User s Guide - Version 1.0 March 2012

15 : User s Guide This graph speaks to the relationship between the amount of heating and cooling is gained/lost vs. the amount saved on lighting. This seems counterintuitive to some. If so, refer to the DOE report listed in SunLite Calc under the Downloads Tab At this point you can enter a new number of skylights to analyze based on maximizing your clients return. Don t forget to hit the button in order to re-run the calculations! Page 15

16 User s Guide Climate Results The Average Daily Foot Candles graph displays the average indoor daylight illuminance in foot candles for each hour in each month for the SunLite Strip for the project you ve defined. This gives an indication of how bright it will be inside from daylight only. The calculations are based on the average weather conditions for each hour of each month, using typical weather data (TMY) for the location selected. Of course, on any given day the value may be higher or lower, depending on actual conditions. The shading of the graph, which is relative to the Lighting Setpoint you defined earlier, indicates the hours during which the electric lighting system will be completely on, at minimum power, or somewhere in between. Page 16 SunLite Calc User s Guide - Version 1.0 March 2012

17 Payback Analysis : User s Guide The final element of SunLite Calc is to take the analysis completed, apply estimates for product cost and labor and balance that against the energy savings to formulate a simple Payback Period. At the top of the report, you ll see a recap of the project you ve defined (setpoint, roof u-factor, lighting controls and fixture height), an estimate of the unit costs for the number of SunLite Strip units you ve elected and the labor you ve estimated to install them. Why do we call it a simple Payback Period? Perhaps it s easier to explain what this number does not include; any increases in utility cost, net present value of the energy savings, EPAct tax deductions, utility company rebates (peak shaving, etc.), increased worker productivity and satisfaction, increased sales, better looking merchandise, LEED point contribution, etc. Page 17