I need help with the second table.and these questions 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-factorratings 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 TypeWallsb) Ceiling (Assume the ceiling area is the same as rectangular floorarea, 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 2eaUnit: BTUTable 8-1Size of area(width x height-ft³)3300 ft^21800 ft^272 ft^228 ft^2HL=Heat loss (BTU)- Hv x hours=In summary heat loss for D days isHL (A/R) AT* D days *24 hrsU-factor R-values0.060.0250.35If loss for one day, H = 24 hrsIf we are talking about a D days then H-24 hrs x D (e.g. During February, H-24 hrs x 28 days)0,2016.66402.855 Home Heat Loss Calculation TableUse coldest month of Feb (28 days) average of 20 degree "F outside. Assume inside temperature of the house is 70 °FTable 8-2Surface TypeWallCeilingWindowDoorArea (ft³)A1-An2 x 2-1059 2-2118Insulation R-value(from Table 8-1)AT (°F)Daily (1 day)Loss in BTUSIGrand total of all conduction heat losses in BTU E28 day monthlost in BTUΣ2

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Answered: 1- If 1 gallon of oil = 1.4 therm, how…

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

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.17P

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