1. A small metal building is to be constructed of corrugated steel sheet walls with a total wall surface area of about 300 m². The air conditioner consumes about I kW of electricity for every 4 kW of cooling supplied and two wall construction are to be compared on the basis of cooling costs. Assume that electricity costs S0.15/kWh. Determine the electrical energy savings per week of using 260 mm of fiberglass batt insulation to the steel sheet wall (U-0.17 W/ m² "C) instead of 159 mm of fiberglass insulation (U= 0.31 W/m² °C) assuming an overall temperature difference of 20 °C across the wall.
1. A small metal building is to be constructed of corrugated steel sheet walls with a total wall surface area of about 300 m². The air conditioner consumes about I kW of electricity for every 4 kW of cooling supplied and two wall construction are to be compared on the basis of cooling costs. Assume that electricity costs S0.15/kWh. Determine the electrical energy savings per week of using 260 mm of fiberglass batt insulation to the steel sheet wall (U-0.17 W/ m² "C) instead of 159 mm of fiberglass insulation (U= 0.31 W/m² °C) assuming an overall temperature difference of 20 °C across the wall.
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:1. A small metal building is to be constructed of corrugated steel sheet walls with a total wall surface area of
about 300 m². The air conditioner consumes about 1 kW of electricity for every 4 kW of cooling supplied
and two wall construction are to be compared on the basis of cooling costs. Assume that electricity costs
S0.15/kWh. Determine the electrical energy savings per week of using 260 mm of fiberglass batt insulation
to the steel sheet wall (U-0.17 W/m² "C) instead of 159 mm of fiberglass insulation (U-0.31 W/m² °C)
assuming an overall temperature difference of 20 °C across the wall.
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