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J <br />l , <br />1997 WSEC ReilsIgmea <br />71, WE <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 (Ft) 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 faMor is ° F for yourjurisdiction <br />To determine AT: (AT= 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 °F for heating and 78' F for cooling. <br />Example: For Elma, WA: Winter <br />Indoor Design Temperature =70°F <br />Outdoor Design Temperature =24'F <br />...so... (7(1' F)424° F) = 46 AT <br />S. 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 heaving 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 />ACH" <br />`Factors .'BTU/Hr-.:. <br />Structural loss <br />(1) (BTU/Hr/F) <br />x <br />Air leakage loss <br />(2) (ft3) <br />x <br />x .60 <br />x 0.018 <br />(b) <br />Duct losses <br />(3) (BTU/Hr/F) <br />a, <br />x .20 <br />= (c) <br />,Permit No. <br />Name <br />strest <br />►t�LOTe <br />CL,aY_ <br />=� <br />Manufacturer <br />Type or System <br />Models <br />Heating Ouput: <br />KW <br />BtulHr. <br />Notes: <br />Design Heat Load (D.H.L.) <br />(a+b+c) (BTU/Hr) <br />Maximum Heating Output <br />(Gas, all, propane, wood) <br />(Design Heat load x 2.0) (BTU/Hr) <br />40 <br />OR <br />4. <br />Maximum Heating Output <br />(Electric, heat pumps) 9 <br />(D. H. L. X 2.0 _ 3413) 1 (kWatts) <br />WIfty crY <br />