Figure shows a house whose walls consist of plaster (R = 0.45), R-11 fiberglass insulation, plywood (R = 0.65), and cedar shingles (R = 0.55). The roof has the same construction except it uses R-30 fiberglass insulation. The average outdoor temperature in winter is 25 ?F , and the house is maintained at 75 ?F. The house's oil furnace produces 100,000 Btu for every gallon of oil, and oil costs $2.20 per gallon. Assume that the house has 10 single-glazed windows, each measuring 3.0 ft by 4.9 ft. Four of the windows are on the south and admit solar energy at the average rate of 30 Btu/h?ft2. All the windows lose heat; their R- factoris 0.90. Find the total heating cost for the month. How much is the solar gain worth?
Figure shows a house whose walls consist of plaster (R = 0.45), R-11 fiberglass insulation, plywood (R = 0.65), and cedar shingles (R = 0.55). The roof has the same construction except it uses R-30 fiberglass insulation. The average outdoor temperature in winter is 25 ?F , and the house is maintained at 75 ?F. The house's oil furnace produces 100,000 Btu for every gallon of oil, and oil costs $2.20 per gallon. Assume that the house has 10 single-glazed windows, each measuring 3.0 ft by 4.9 ft. Four of the windows are on the south and admit solar energy at the average rate of 30 Btu/h?ft2. All the windows lose heat; their R- factoris 0.90. Find the total heating cost for the month. How much is the solar gain worth?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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please dont copy from chegg ,,,,chegg ans is wrong please give me stepwise ans of both part
Transcribed Image Text:Figure shows a house whose walls consist of
plaster (R = 0.45), R-11 fiberglass insulation,
plywood (R = 0.65), and cedar shingles (R = 0.55).
The roof has the same construction except it uses
R-30 fiberglass insulation. The average outdoor
temperature in winter is 25 ?F , and the house is
maintained at 75 ?F. The house's oil furnace
produces 100,000 Btu for every gallon of oil, and
oil costs $2.20 per gallon. Assume that the house
has 10 single-glazed windows, each measuring
3.0 ft by 4.9 ft. Four of the windows are on the
south and admit solar energy at the average rate
of 30 Btu/h?ft2. All the windows lose heat; their R-
factoris 0.90.
Find the total heating cost for the month.
How much is the solar gain worth?
A = (36 ft)(14
cos 30
h = 14 ft X tan 30
300
10 ft
36 ft
28 ft
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