Nine old, 12-ft2 windows with a U-value of U = 1.2 ./0 1·3/4·°F were replaced with new windows having U = 0.3 ./0 1·3/4·°F . Calculate the energy savings on a day during a five-hour period when Tin = 68oF and Toutside = 10oF.
What will be an ideal response?
energy savings for a period of 5 hours = 5,638 Btu/h × 5 h = 28,190 Btu
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