A manufacturing facility located at 32° N latitude has a glazing area of 60 m² facing west that consists ofdouble pane windows made of clear glass (SHGC = 0.766). To reduce the solar heat gain in summer, areflective 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 fluxesincident 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 andnatural gas are $0.09/kWh and $0.45/therm., respectively. If the coefficient of performance of the coolingsystem is 3.2 and the efficiency of the furnace is 0.90, determine the net annual cost savings due to installingreflective coating on the windows. Also, determine the simple payback period if the installation cost ofreflective film is $20/m².Answers: $53, 23 years

GIven: A=60 m2 COP=3.2 Efficiency=0.9 cost of electricity= $0.09 /kWh Cost of natural gas= $0.45…

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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Concept explainers

Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.

Question

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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