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1997 WSEC Residential Design Heat Load Form <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 }he dweiling. <br />3. Duct Loss, vaiue (3): Insert value from BTUIHR, Box (a).Climate Factor, <br />4. �1T: The Iocai ASHRAE ciimate factor i, `iZ ° F for your jurisdiction <br />To determine �T: (dT= fhe temperature diHerence behveen Outdoor design temperature and <br />Indoor Design Temperature). The heating or cooling OuMoor 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 heat;ng and 78°F for cooling. <br />Example: For Elma, WA.-Winter <br />IndoorDesignTemperature =70°F <br />Outdoor Design Tempereture =24° F <br />..so... (70° F)-(24° F) = 46 �T <br />5. Calculate values a, b, and c by multiplying the numbers in e3ch 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 outout for the building. <br />S. If the heating system is etectric, divide the BTU/hr. vaiue from Step #7 by 3413 to get kWatt output. <br />Heat loss path Values �T ACH Factors BTU/Hr <br />Structuralloss (1) .3Z� (BTU/Hr/F) x ��.L =j3�I (a) <br />Air leakage Ioss �z� .3 ys a (ft3) x�I,Z x.60 x 0.018 =� S� (b) <br />Duct losses (3) � -� ` � (BTU/HdF) x .20 = Z -� � (c) <br />Pertnit <br />LOT# <br />City <br />County <br />PhoneA' <br />Manutacturer <br />Type of System <br />Model# <br />Heating Ouput: <br />KW <br />BtulHr. <br />Notes: <br />Design Heat Load (D.H.L.) 7 <br />(a+b+c) . <br />Maximum Heating Output <br />(Gas, oil, propane, wood) � <br />(Design Heat load x 2.0J • <br />OR <br />y <br />(Electric, heat pumps) � <br />(D. H. L. X 2.0 = 3413) • <br />�2.ZI <br />(BTU/Hr) <br />� `I `I Z <br />(BTU/Flr) <br />�� 8 <br />(k�Vatts) <br />su.ivmeo��aeoe <br />i' <br />� �� <br />