Heat loss guide slideshare part 7

Sep 11, 20130 likes246 views

This document outlines how to calculate heat loss through infiltration using the crack method. It provides the formula to calculate heat loss in Btu/h as a function of airflow in cfm and temperature difference in F. It then works through an example calculation for a house with four windows totalling 18 linear feet, assuming a leakage rate of 0.1 cfm per linear foot, to find a total heat loss of 2,220 Btu/h.

STEP 7: Calculate the heat loss through infiltration by crack method
q (Btu/h) = 1.1 * V (cfm) * T ( F)
V (cfm) = (P*leakage rate)each window
V (cfm) = 18*(3’ + 3’ + 4’ + 4’)*(0.10 cfm/ft)
= 25.2 cfm
q (Btu/h) = 1.1 * (25.2 cfm) * 80.1 F = 2,220 Btu/h

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