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1997 WSEC iiien�ial �g <br />Instructions: <br />A. The following steps will determine the maximum heating system size: <br />1. Structural loss, value (1): May be taken directly from the Proposed UA box on Page 2. <br />2. Air leakage loss, Value (2): This is the volume (FP) of the conditioned space in the dwelling. <br />3. Duct Loss, value (3): Insert value from BTU/HR, Box (a).Climate Factor, <br />4. AT: The local ASHRAE climate factor is ° F for yourjurisdiction <br />To determine AT: (dT= the temperature difference between Outdoor design temperature and <br />Indoor Design Temperature). The heating or cooling Outdoor Design Temperatures shall be <br />selected from 0.6% column for winter and 0.5% column for summer from the Puget Sound <br />Chapter of ASHRAE publication "Recommended Outdoor Design Temperatures, Washington <br />State, ASHRAE.). Indoor Design Temperature shall be 70 OF for heating and 780F for cooling. <br />Example: For Elma, WA. -Winter <br />indoor Design Temperature =70° F <br />Outdoor Design Temperature =24°F <br />...so... (70 ° F)424" F) = 46 AT <br />5. Calculate values a, b, and c by multiplying the numbers in each horizontal row. <br />6. Add values a, b, and c. <br />7. Multiply the sum from Step #6 by 2.0 to obtain the maximum heating system output for the building. <br />8. If the heating system is electric, divide the BTU/hr. value from Step #7 by 3413 to get kWatt output. <br />Heat loss path <br />Values ., <br />;AT-. <br />,ACHE <br />Fact0*4 <br />7131TU/Hr M. <br />Structural loss <br />(1) (BTU!Hr/F) <br />xi`��!' <br />_ (a) <br />Air leakage loss <br />(2) (11:3) <br />x <br />x .60 <br />x 0.018 <br />= (b) <br />Duct losses <br />(3) (BTU/Hr/F) <br />-„ T r t <br />t J,( <br />x .20 <br />= (c) <br />.Permit No. <br />...i4 <br />Name <br />'LOT# <br />city ., .. <br />County <br />Phone# <br />Manufacturer <br />Type of Sys'em <br />Model# <br />Heating Ouput <br />KW' <br />Btu/Hr. <br />Notes: <br />Design Heat Load (D.H.L.) <br />(a+b+c) <br />Maximum Heating Output <br />(Gas, oil, propane, wood) i <br />(Design Heat load x 2.0) <br />40 <br />OR <br />y <br />(Electric, heat pumps) <br />(D. H. L. X 2.0 _ 3413) <br />(BTU/Hr) <br />(BTU/Hr) <br />(Watts) <br />C <br />