OWENS CORNING COMMERCIAL ENERGY CALCULATOR
Contents
1. k OWENS CORNING COMMERCIAL ENERGY CALCULATOR FREQUENTLY ASKED QUESTIONS INNOVATIONS FOR LIVING k A exp CERT CHI Area mw x 1 gt jx E al lt B y i D d i m A add Ct 2 V 2 INNOVATIONS FOR LIVING qu ON lt OWENS CORNING COMMERCIAL ENERGY CALCULATOR FREQUENTLY ASKED QUESTIONS WHAT 15 THE PURPOSE OF THE OWENS CORNING COMMERCIAL ENERGY CALCULATOR OC CEC The main purpose of the OC CEC Is to provide a simple way to demonstrate how improving the performance of envelope lighting and HVAC systems can help a metal building owner qualify for tax deductions under the Energy Policy Act of 2005 EPAct 2005 As well the OC CEC estimates a simple payback period for any combination of thermal efficiency measures within the metal building DOES EPACT 2005 PROVIDE A TAX DEDUCTION OR A TAX CREDIT Commercial building owners can qualify for a tax deduction and not a tax credit The net value of the tax deduction could be less than the full amount depending on the specific tax circumstances WHO CAN TAKE ADVANTAGE OF THE TAX DEDUCTIONS In most cases the building owner gets the deduction If the owner is a government agency or non profit organization the project designer can take the deduction WHAT ARE THE TAX DEDUCTION AMOUNTS EPAct 2005 allows a 1 80 per square foot tax de2. A August 2007 THE PINK PANTHER amp 1964 2007 Metro Goldw yn M ayer Studios Inc All Rights Reserved The color PINK is a registered trademark of Owens Corning 2007 Owens Corning
3. AND WINDOWS AT 3 0 OF THE WALL AREA The default settings are based on research that indicates the approximate amount of skylights required to provide sufficient natural light in the space to have their artificial lights off during the day and the amount of windows typically found in today s metal warehouses An end user can change these values based on the window and skylight percentages for their particular metal building Acceptable ranges 0 10 for windows and 0 576 for skylights WHY IS IT MORE DIFFICULT TO EXCEED THE EPACT SAVINGS THRESHOLD FOR A METAL BUILDING WITHOUT SKYLIGHTS Skylights introduce natural light into a metal building Natural light allows the OC CEC to reduce the artificial light in the design space through lighting controls which saves energy The annual energy savings estimates for a metal building with upgraded skylights and lighting controls are greater than a building with no skylights and no controls This increase in energy savings offsets the increase in estimated annual energy costs and leads to a larger percentage of EPAct savings for the building DO CHANGES IN THE OF SKYLIGHTS AFFECT THE AMOUNT OF LIGHTING NEEDED 15 THERE A DIRECT CORRELATION The of skylights does not affect the amount of artificial lighting needed as you still need to install sufficient lights to light the building at night It does influence the how many lights need to be on during the day when sufficient natural light e
4. in ASHRAE 2011 2001 As example a user can compare the energy cost savings associated with going from an 10 to an R 19 in a metal building wall for a heated and cooled metal building in zip code 43528 even though 10 is less than the ASHRAE 90 1 2001 wall baseline level of 13 This is accomplished on the results screen WHAT IF MY INSTALLED COSTS OR ENERGY COSTS DIFFER FROM THOSE DISPLAYED Energy costs and installed costs can be adjusted by the end user on a case by case basis Modifying these costs will provide the most accurate payback assessments for a metal building WHAT ARE THE DEFAULT CRITERIA FOR THE BUILDING SCHEDULE FOR HOURS OF OPERATION The default schedule is Monday Friday am 5pm Saturday Low occupancy am 5pm sunday amp Holidays Closed WHO IS GREEN BUILDING STUDIO Green Building Studio is an architectural engineering and construction software company and the industry s leading provider and innovator of web based building energy analysis tools GBS s energy engineering service provides world class green sustainable building design assistance as well as strategic building product market research Owens Corning collaborated with Green Building studio for the development of the OC CEC que CORNY OWENS CORNING INSULATING SYSTEMS LLC ONE OWENS CORNING PARKWAY TOLEDO OHIO USA 43659 1 800 GET PINK INNOVATIONS FOR LIMNG ww W OWenscorning com Pub No 10005368 Printed in U S
5. measures may vary from this modeled estimate The modeled results are based on hourly simulations using the DOE 2 2 computer program The results are based on certain assumptions including density of occupancy number of persons use of the building by occupants heating and cooling preferences of the occupants or the owner if applicable weather patterns and electricity and fuel costs Since these factors will vary from building to building from year to year and from occupant to occupant the actual annual energy costs cannot be precisely predicted for any specific building While the overall plug load for the building modeled has been factored into the energy use of the building as mandated by the rules governing the EPAct 2005 legislation the estimated cost effectiveness of envelope lighting and HVAC measures do not include specific loads for appliances computers and other equipment or machinery and therefore the energy use reflected in any actual utility bills will be different from the modeled building OWENS CORNING COMMERCIAL ENERGY CALCULATOR l FREQUENTLY ASKED QUESTIONS FOR CAN COMPARE INSULATION SYSTEMS THAT ARE LESS EFFICIENT THAN THE LEVELS SPECIFIED IN ASHRAE 90 1 2001 Yes The OC CEC can be used to estimate the energy cost savings and payback associated with more thermally efficient insulation systems in metal building roofs and walls even if the specified baseline insulation levels are less than those
6. to 50 F for all hours of operation The tool specifies a heating capacity of the system to a value that is less then what is required for the space to be considered a fully heated space but larger then 3 4 Btu hr ft required for a semiheated space This thermostat set point and heating capacity approach is used for both the baseline and proposed runs in the OC CEC Regardless what HVAC system is selected the cooling thermostat set point is set high enough to prevent the cooling system from ever coming on for the semiheated building HOW DOES THE OC CEC TREAT BUILDINGS THAT ARE FULLY CONDITIONED FOR HEAT BUT NOT COOLED These buildings are considered nonresidential conditioned space if they meet the criteria specified in Table see page 7 The EPAct calculations are carried out as if the building was heated and cooled see the question on treatment of semiheated spaces We are in the process of evaluating the addition of heat only HVAC systems in the OC CEC OWENS CORNING COMMERCIAL ENERGY CALCULATOR l FREQUENTLY ASKED QUESTIONS FOR WHAT IF MY BUILDING HAS TILT UP CONCRETE WALLS Tilt up concrete walls are not an option in the OC CEC The thermal performance criteria for the metal building walls in the OC CEC are defined in ASHRAE 904 2001 Tables 26 We are evaluating tilt up concrete walls as a new scope modification in the tool CAN MY ENVELOPE LIGHTING OR HVAC SYSTEM BE ADDED TO THE TOOL We will eva
7. FOR LIVING qu ON lt OWENS CORNING COMMERCIAL ENERGY CALCULATOR FREQUENTLY ASKED QUESTIONS HOW DOES THE OC CEC TREAT SEMIHEATED SPACES The IRS references three standards for the EPAct calculation methodology used by the OC CEC e ASHRAE 90 1 200 determines the baseline requirements of the interior light ing systems heating cooling ventilation hot water systems and building envelope e ASHRAE 90 1 2004 Appendix G determines the methods to be used for the baseline performance including specifying what type of HVAC system 15 used in the baseline and proposed runs e 2005 California Title 24 Nonresidential ACM determines the internal loads and schedules of operation including the thermostat set points ASHRAE 90 1 2004 Appendix G does not mention semiheated spaces and 2005 California Title 24 Nonresidential ACM dictates that our thermostat set points be 70 F for heating and 73 F for cooling Hence the standards require us to use an HVAC system that heats and cools the building to the aforementioned set points for the semiheated EPAct runs In most cases semiheated metal buildings will exceed the energy cost savings thresholds specified by EPAct For the annual energy cost saving estimates which are separate from the EPAct calculations the OC CEC uses a forced air heating system that consumes natural gas for heating one or several rooms and reduces the design temperature and thermostat set point
8. ayback is attractive without the tax incentive However per EPAct 2005 only DOE approved software can be used to complete the building simulation for tax purposes The list of qualified DOE software can be found at the following address http www w eere energy gov buildings info qualified software After approval the OC CEC will be added to the software list The OC CEC should not be used for tax purposes until and unless approved by the DOE DOES EPACT 2005 PROPOSE OTHER REQUIREMENTS TO QUALIFY FOR A TAX DEDUCTION Yes In addition to completing the simulation with the OC CEC an inspection must be completed by a qualified individual after the building has been placed in service Taken directly from the IRS Notice 2006 52 a qualified individual is defined as follows Is not related within the meaning of 45 e 4 to the taxpayer claiming the deduction under 1790 2 ls an engineer or contractor that is properly licensed as a professional engineer or contractor in the jurisdiction in which the building is located 3 Has represented in writing to the taxpayer that he or she has the requisite qualifi cations to provide the certification required under section 4 of notice 2006 52 in the case of an individual providing the certification or to perform the inspection and testing described in section 4 05 of this notice in the case of an individual performing the inspection For more detail on the building inspection se
9. back perspective WHAT IS THE PURPOSE OF THE RE ENTER DATA AND EDIT BUTTON DO ON THE PROJECT SCREEN The re enter data button allows a user to re enter building information for the project Length Width Average Wall Height Window 76 etc Submitting this new building information removes previous run data Hit the Calculate button at the bottom of the screen to rerun the building with the new information The edit button allows a user to change the project information Hit the Submit Changes button to save the modification to the project que CORNY INNOVATIONS FOR LIVING OWENS CORNING COMMERCIAL ENERGY CALCULATOR FREQUENTLY ASKED QUESTIONS HOW DOES THE TOOL CALCULATE SIMPLE PAYBACK PERIODS The tool calculates a simple payback periods with and without the tax deduction This payback estimate is designed as a guide in the decision making process Actual payback periods may vary from this estimate based upon assumptions for energy costs and installed costs for various energy efficiency measures There are two payback estimates in the tool Simple Payback period yrs Incremental Cost divided by Annual Energy Savings 2 Simple Payback Period yrs with EPAct Incremental cost EPAct Tax Deduction divided by Annual Energy Savings CAN THE OC CEC BE USED TO PREDICT ACTUAL ANNUAL ENERGY COSTS Actual energy use and cost effectiveness of the envelope lighting and HVAC efficiency
10. duction for commercial buildings that are at least 5076 more energy efficient on an annual energy cost basis than the mandated levels in ASHRAE 9011 2001 In addition EPAct 2005 allows partial deductions for the envelope HVAC and lighting systems of 0 60 per square foot A partially qualifying property must save at least 6 2 376 in energy costs through efficiency improvements in any one of the envelope lighting or HVAC systems The OC CEC uses the Department of Energy DOE 2 2 simulation software to determine whether a metal building can meet or exceed the full EPAct 5076 or envelope only 6 2 376 energy cost savings targets based on the metal building location and space conditioning category HAS A THIRD PARTY CERTIFIED THE CALCULATIONS Per EPAct 2005 DOE approved software must be used to complete the building simulation Currently DOE is reviewing the and we anticipate approval in the later part of 2007 Check our website for updates on approval status While we have made great effort to describe these tax incentives accurately we cannot provide tax advice and suggest you contact a tax professional with any questions specific to your situation OWENS CORNING COMMERCIAL ENERGY CALCULATOR l FREQUENTLY ASKED QUESTIONS FOR CAN USE THE OC CEC PRIOR TO APPROVAL FROM THE DOE The tool can be used to estimate energy cost savings and paybacks with and without the tax deduction and in many cases the p
11. e the following website http www w irs gov irb 2006 26 IRB ar11 html WHAT ARE THE OBJECTIVES OF THE BUILDING INSPECTION Only the systems being used for the tax deductions need to be inspected There are two objectives for the inspection Verify that the taxpayer s building meets the necessary mandatory provisions of Standard 90 1 200l 2 Verify that the specifications of the energy systems installed in the taxpayer s building used for the tax deductions meet or exceed the performance of the GY E energy systems used in the proposed OC CEC building model ATUS que CORNY While we have made great effort to describe these tax incentives accurately we cannot provide tax advice and suggest you contact a tax professional with any questions specific to your situation Per the National Renewable Energy Laboratory NREL Energy Savings modeling and inspection guidelines for commercial tax deductions http www nrel gov docs fyO osti 40228 pdf INNOVATIONS FOR LIVING RY lt OWENS CORNING COMMERCIAL ENERGY CALCULATOR FREQUENTLY ASKED QUESTIONS WHAT DOCUMENTATION IS REQUIRED AND WHAT MUST THE TAXPAYER DO WITH IT The qualified individual shall use the compliance forms from the Standard 90 1 2001 User s Manual or equivalent forms to document that the taxpayer s building meets the mandatory provisions We are in the process of creating equivalent forms in the OC CEC and anticipate uploading these fo
12. luate the addition of new systems to the tool on a case by case basis Requests can be made through a registered tool user or an Owens Corning National Accounts manager for metal building insulation The next update to the OC CEC pull down lists will include different levels of slab insulation RIO and 5 ASHRAE baseline systems for through fastened roofs and units on the 5076 delamping measure 0 6 W sf CAN A RETROFIT METAL BUILDING QUALIFY FOR THE TAX INCENTIVES WHAT I THE DEFINITION OF A BUILDING QUALIFYING FROM A DATE STANDPOINT Retrofits within the scope of ASHRAE 90 1 2001 for commercial buildings and can qualify for the tax incentives T he renovations or building for new construction must be placed in service after December 315 2005 and before January Ist 2009 When considering retrofit applications keep in mind that EPAct rules and qualification for the tax deduction do not change for these structures A retrofit metal building must demonstrate a 5076 reduction in energy cost when compared to a reference building that meets the minimum envelope HVAC and lighting requirements of ASHRAE 90 1 2001 The retrofit building as it exists today is not the baseline building for an EPAct analysis in the OC CEC On the other hand the OC CEC can be used to estimate the energy cost savings associated with improved energy efficiency measures that are less than 20 1 2001 levels and these modifications may make sense from a pay
13. nters the building through the skylight to have the artificial lights off There is an ideal skylight balance where too much solar heat gain creates a cooling problem que CORNY INNOVATIONS FOR LIVING RY lt OWENS CORNING COMMERCIAL ENERGY CALCULATOR FREQUENTLY ASKED QUESTIONS HOW DO PRINT THE RESULTS PAGE Select File then Print on the results page When the print window appears press the Preferences button and select Landscape Press the OK button and Print button This should give you a reasonable print out of the results page You may need to the adjust margins based on your printer We are in the process of creating the ability to convert this page into a pdf document Check the OC CEC website for the status of these uploads WHY ARE THERE NO DOORS INCLUDED IN THE OC CEC AND HOW WILL THE LACK OF DOOR OPENINGS AFFECT MY RESULTS For this early version of the OC CEC it was decided not to include doors due to the complexity associated with specifying them Further one of the major issues with doors is infiltration which is fixed for all options in the EPAct analysis This prevents any benefits from being recognized for a good sealing door versus a poor sealing door We do not know the impact of including doors on the energy cost savings estimates since doors are not part of the model simulations VVe do anticipate adding doors in a future version Check the OC CEC website fo
14. put capacity relative to the floor area is greater than or equal to the following criteria by climate zone Heating Output Climate HDD 65 5 BTU hr ft 2 0 1800 10 BTU hr ft 2 1801 3600 15 BTU hr ft 2 3601 7200 20 BTU hr ft 2 7201 10800 25 BTU hr ft 2 10801 16200 30 BTU hr ft 2 162014 Is the space heated or cooled indirectly by being connected to adjacent spaces NO Will this space be used primarily for living and sleeping This is Nonresidential Conditioned NO Space This is Semiheated Space and must be designated as such by a building official in climates that exceed 1800 HDD 65 Is the space heated by a heating system whose output capacity is greater than or equal to 3 4 Btu h ft2 of floor area but is not a conditioned space YES This is Unconditioned Space and must be designated as such by a building official in climates that exceed 1800 HDD 65 Is the space enclosed within a building that is not a YES conditioned space or a semiheated space There are two Space Conditioning categories in the OC CEC If the above flow chart indicates the space in your metal building is INonresidential Conditioned select Heated and Cooled from the pull down menu If the space is Semiheated select Semiheated from the pull down menu See ASHRAE Standard 90 1 2001 for a detailed discussion of indirectly conditioned spaced ques Om INNOVATIONS FOR LIVING eo INNOVATIONS
15. r the status of these uploads CAN YOU PROVIDE SOME ADDITIONAL DETAIL ON THE SPACE CONDITIONING CATEGORIES IN THE OC CEC WHAT IS THE RIGHT CATEGORY FOR MY METAL BUILDING ASHRAE 90 1 2001 specifies different requirements based on the following three enclosed space conditioning categories Nonresidential Conditioned Space Residential Conditioned Space e Semiheated Space Note Must be approved by a building official in climates that exceed 1800 HDD 65 Table see page 7 provides some high level guidance for determining the appropriate space conditioning category for a metal building This table should only be used as a guide and does not guarantee the proper selection of a space conditioning category consult with local code authoring before finalizing design OWENS CORNING COMMERCIAL ENERGY CALCULATOR FREQUENTLY ASKED QUESTIONS TABLE 1 ASHRAE 90 1 2001 SPACE CATEGORIES GUIDE NO This is Unenclosed Space Is the space surrounded by solid surfaces such as walls floors roofs and openable devices such as doors and operable windows This is Enclosed Space Crawlspaces YES attics and parking garages with natural or mechanical ventilation are not considered enclosed spaces Is the space cooled by a cooling system whose sensible YES output capacity exceeds 5 Btu h ft2 of floor area This is YES Residential Conditioned Space Is the space heated by a heating system whose out
16. rms in the later part of 2007 Check the OC CEC website for the status of these uploads A taxpayer is not required to attach the certification to the return on which the deduction is taken However 1 6001 1 of the Income Tax Regulations requires that taxpayers maintain such books and records to establish the entitlement to and amount of any deduction claimed by the taxpayer Accordingly a taxpayer claiming a deduction under 1790 should retain the certification as part of the taxpayer s records for purposes of 1 6001 of the Income Tax Regulations Consult with your tax advisor or other tax professional to discuss other record keeping requirements HOW DO CLAIM THE TAX DEDUCTION In order to claim the EPAct deduction the tax preparer will need to follow the guidelines as provided by EPAct 2005 Section 1331 paragraph 1790 At this time the IRS has no plans to provide a special form for taxpayers to take this deduction Note These guidelines may change as the legislation is updated which 15 anticipated This document can be viewed at http frwebgate access gpo gov cgi bin getdoc cgi dbnamez109 cong public laws amp docid t publ058 109 WHERE CAN GET COPIES OF THE ENERGY POLICY ACT OF 2005 COMPLIANCE AND GUIDANCE DOCUMENTS FOR COMMERCIAL BUILDINGS Latest NREL guidance document February 2007 htto www nrel gov docs ty07osti 40228 pdt IRS Notice 2006 52 http www irs gov iro 2006 26_IRB ar11 html Energ
17. y Policy Act of 2005 Section 1331 paragraph 1790 http frwebgate access gpo gov cgi bin getdoc cgi doname 109_cong_public_ laws amp docid T publ058 109 Compliance forms from the ASHRAE Standard 90 1 2001 User s Manual http ww w ashrae org technology page 97 While we have made great effort to describe these tax incentives accurately we cannot provide tax advice and suggest you contact a tax professional with any questions specific to your situation OWENS CORNING COMMERCIAL ENERGY CALCULATOR l FREQUENTLY ASKED QUESTIONS FOR WHY DOES THE OC CEC RECOMMEND THE SAME INSULATION SYSTEMS FOR SEMIHEATED AND CONDITIONED BUILDINGS REGARDLESS OF THE BUILDING SIZE SPACE CONDITIONING CATEGORY OR LIP CODE The initial run of the OC CEC for any individual building applies different packages of energy efficiency measures to the designed metal building and looks for a package that will exceed the 5076 energy cost savings thresholds per the EPAct 2005 Hence the same measures may show for a Semiheated and Heated and Cooled metal building After the initial run of the OC CEC for a building an end user can manually determine whether the metal building can qualify for the tax deduction with alternate envelope HVAC and lighting packages by selecting different Proposed measures the results screen of the OC CEC and hitting the Recalculate button WHY ARE THERE DEFAULTS FOR SKYLIGHTS AT 3 5 OF THE ROOF AREA
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