Heat Loss Analysis 03
Heat Loss Analysis 03
Heat Loss Analysis 03
References:
- Heat Transfer, J. P. Holman, Natural Convection System (page 347, simplified equation for free convection)
- Field Observation Data
- Mechanical Engineering Handbook, thermal conductivity values
at transfer coefficient through insulated pipes, Btu/hr.sqft.F
surface area, sqft
rature, 72F in dry season, 59F in rainy season
e temperature, 346F
s) - T ambient, C
re) - T ambient, C
Pipe MBtu/hr MBtu/hr Btu/h.sqft.F Btu/h.sqft.F sqft sqft F F inch inch inch Btu/h.ft.F Btu/h.ft.F feet Btu/h.sqft.F Btu/h.sqft.F
Size Qins Qbare Uins Ubare Ains Abare Ti Ta r1 ri r2 kp kins L hIns hBare
16 0.121 0.545 0.201 1.132 2,198.00 1,758.40 346 72 8 7.5 10 24.85 0.0489 420 0.8549 1.1339
30 0.229 1.095 0.208 1.132 4,003.50 3,532.50 346 72 15 14.5 17 24.85 0.0489 450 0.8549 1.1339
36 0.072 0.351 0.210 1.132 1,256.00 1,130.40 346 72 18 17.5 20 24.85 0.0489 120 0.8549 1.1339
Pipe MBtu/hr MBtu/hr Btu/h.sqft.F Btu/h.sqft.F sqft sqft F F inch inch inch Btu/h.ft.F Btu/h.ft.F feet Btu/h.sqft.F Btu/h.sqft.F
Size Qins Qbare Uins Ubare Ains Abare Ti Ta r1 ri r2 kp kins L hIns hBare
16 0.128 0.580 0.203 1.150 2,198.00 1,758.40 346 59 8 7.5 10 24.85 0.0489 420 0.8870 1.1525
30 0.242 1.166 0.210 1.150 4,003.50 3,532.50 346 59 15 14.5 17 24.85 0.0489 450 0.8870 1.1525
36 0.076 0.373 0.212 1.150 1,256.00 1,130.40 346 59 18 17.5 20 24.85 0.0489 120 0.8870 1.1525
no rain condition, Ta = 22 C
Tw_ins 82 C
Tw_bare 162 C
rain condition, Ta = 15 C
Tw_ins 82 C
Tw_bare 162 C
NPV at 8% DR 729,155.693