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1- If 1 gallon of oil = 1.4 therm, how many gallons have been wasted by heat loss in Feb? (1 therm = 100,000 BTU)   2- If $1.30 per therm, how much did you waste from house heat loss in Feb

1- If 1 gallon of oil = 1.4 therm, how many gallons have been wasted by heat loss in Feb? (1 therm = 100,000 BTU)   2- If $1.30 per therm, how much did you waste from house heat loss in Feb

Elements Of Electromagnetics
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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1- If 1 gallon of oil = 1.4 therm, how many gallons have been wasted by heat loss in Feb? (1 therm = 100,000 BTU)

 

2- If $1.30 per therm, how much did you waste from house heat loss in Feb?

 

 

Window insulation: U-factor and R-value: U-factor measures how well a product prevents heat from escaping a home or building (thermal conductivity). U-factor ratings generally fall between 0115 and 1.20. (See more at: http://www.nfrc.org/windowratings/Energy- ratings.html#sthash.EUkrrint.dpuf) A lower U-factor means a better-insulating window. The more common term R-value refers to the resistance of the window to heat conduction, and it is the inverse of the U- factor (that is, R-value=1/U-factor). Better windows have high R-values and low U-factors. Determine all surface type of areas in Table 8-1 from the house in figure 1 and calculate R-values with the given U-factor. Surface Type Walls b) Ceiling (Assume the ceiling area is the same as rectangular floor area, A-L x W) c) Total window x 8 ea (argon-filled, double glazed for all windows) d) Total door (insulated steel entry doors) x 2ea Unit: BTU Table 8-1 Size of area (width x height-ft³) 3300 ft^2 1800 ft^2 72 ft^2 28 ft^2 HL=Heat loss (BTU)- Hv x hours = In summary heat loss for D days is HL (A/R) AT* D days *24 hrs U-factor R-values 0.06 0.025 0.35 If loss for one day, H = 24 hrs If we are talking about a D days then H-24 hrs x D (e.g. During February, H-24 hrs x 28 days) 0,20 16.66 40 2.85 5
Transcribed Image Text:Window insulation: U-factor and R-value: U-factor measures how well a product prevents heat from escaping a home or building (thermal conductivity). U-factor ratings generally fall between 0115 and 1.20. (See more at: http://www.nfrc.org/windowratings/Energy- ratings.html#sthash.EUkrrint.dpuf) A lower U-factor means a better-insulating window. The more common term R-value refers to the resistance of the window to heat conduction, and it is the inverse of the U- factor (that is, R-value=1/U-factor). Better windows have high R-values and low U-factors. Determine all surface type of areas in Table 8-1 from the house in figure 1 and calculate R-values with the given U-factor. Surface Type Walls b) Ceiling (Assume the ceiling area is the same as rectangular floor area, A-L x W) c) Total window x 8 ea (argon-filled, double glazed for all windows) d) Total door (insulated steel entry doors) x 2ea Unit: BTU Table 8-1 Size of area (width x height-ft³) 3300 ft^2 1800 ft^2 72 ft^2 28 ft^2 HL=Heat loss (BTU)- Hv x hours = In summary heat loss for D days is HL (A/R) AT* D days *24 hrs U-factor R-values 0.06 0.025 0.35 If loss for one day, H = 24 hrs If we are talking about a D days then H-24 hrs x D (e.g. During February, H-24 hrs x 28 days) 0,20 16.66 40 2.85 5
Home Heat Loss Calculation Table Use coldest month of Feb (28 days) average of 20 degree "F outside. Assume inside temperature of the house is 70 °F Table 8-2 Surface Type Wall Ceiling Window Door Area (ft³) A1-An2 x 2-1059 2-2118 Insulation R-value (from Table 8-1) AT (°F) Daily (1 day) Loss in BTUS I Grand total of all conduction heat losses in BTU E 28 day month lost in BTU Σ 2
Transcribed Image Text:Home Heat Loss Calculation Table Use coldest month of Feb (28 days) average of 20 degree "F outside. Assume inside temperature of the house is 70 °F Table 8-2 Surface Type Wall Ceiling Window Door Area (ft³) A1-An2 x 2-1059 2-2118 Insulation R-value (from Table 8-1) AT (°F) Daily (1 day) Loss in BTUS I Grand total of all conduction heat losses in BTU E 28 day month lost in BTU Σ 2
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