system is 3.2 and the efficiency of the furnace is 0.90, determine the net annual cost savings due to installing reflective coating on the windows. Also, determine the simple payback period if the installation cost of reflective film is $20/m2.
system is 3.2 and the efficiency of the furnace is 0.90, determine the net annual cost savings due to installing reflective coating on the windows. Also, determine the simple payback period if the installation cost of reflective film is $20/m2.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:A manufacturing facility located at 32° N latitude has a glazing area of 60 m² facing west that consists of
double pane windows made of clear glass (SHGC = 0.766). To reduce the solar heat gain in summer, a
reflective film that will reduce the SHGC to 0.35 is considered. The cooling season consists of June, July,
August, and September, and the heating season, October through April. The average daily solar heat fluxes
incident on the west side at this latitude are 2.35, 3.03, 3.62, 4.00, 4.20, 4.24, 4.16, 3.93, 3.48, 2.94, 2.33,
and 2.07 kWh/day · m² for January through December, respectively. Also, the unit costs of electricity and
natural gas are $0.09/kWh and $0.45/therm., respectively. If the coefficient of performance of the cooling
system is 3.2 and the efficiency of the furnace is 0.90, determine the net annual cost savings due to installing
reflective coating on the windows. Also, determine the simple payback period if the installation cost of
reflective film is $20/m².
Answers: $53, 23 years
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