Lecture_5.2_Heat_Loss

Lecture_5.2_Heat_Loss - AE202 Lecture 5.2 Heat Loss Heat...

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AE202 Name______________________ Lecture 5.2 Heat Loss Date_______________________ Heat flow rate (q) [BTU/hr] q = [ BTU/hr] A = Actual area [square feet] U T = Actual temperature difference [°F] U T = (T i - T o ) [°F] T i = T o = Temperature T i Inside temperature Winter design = °F Summer design= °F T o Outside design temperature City Pittsburgh AP (Airport) CO (County Office) Latitude Longitude Elevation Winter Design Dry Bulb (State College) @99% ________°F @97 ½% ________°F Basement T D = T i – T soil T soil = T avg – A A = Amplitude T ave = Average air winter temp
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Basement walls Amount of heat flow is proportional to: Length of path U-Value q = u x A x ____ [BTU/hr] TD = Ti – Tsoil Tsoil = T avg – A
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Basement floor q = u x A x TD [BTU/hr] Basement Calculations q = U x A x TD [BTU/hr] Floor Basement Rule of thumb Basement wall 2545/500 = 5.09 BTU/(hr x ft 2 ) _________ BTU/(hr x ft 2 ) Basement floor 960/600 = 1.6 BTU/(hr x ft 2 ) _________BTU/(hr x ft 2 ) q = U x A x TD [BTU/hr] 0 – 1 0 – 2 0 – 3 0 – 4 0 – 5
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Slab on Grade (Review lecture #12, pg. 2) q = F 2 x P x U T Degree Day- Measurement of how cold and how long the winter is Miami, FL 144
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This note was uploaded on 04/01/2008 for the course A E 202 taught by Professor Ling,mosesdf during the Fall '07 term at Penn State.

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Lecture_5.2_Heat_Loss - AE202 Lecture 5.2 Heat Loss Heat...

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