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heat loss in bare and lagged pipes calculations
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Length of Pipe = 10 ftPipe No 1 2 3 4
Covering Bare Pipe Paint Silver Chrome Pa
Outside Diameter, in. 1.315 1.315 2.875 3.1875Emissivity 0.88 0.96 0.26 0.16Barometric Pressure [psia] 14.696 14.696 14.696 14.696Steam Pressure [psig] 30 30 30 30
Steam Temperature84 75 79 8387 79 89 9191 90 91 92
Average Steam Temp 87.3 81.3 86.3 88.7Room Temperature 35 35 35 35
33.0 33.0 33.0 33.033.0 33.0 33.0 33.0
Average Room Temp 33.7 33.7 33.7 33.7Time/run [min] 15 15 15 15
85% Magnesia Insulation
Pipe No. 1 2 3 4Trial
Sur
face
Tem
pera
ture
1st
A 108 116 99 61B 107 114 94 61C 112 112 103 62D 110 113 104 66Average 109.25 113.75 100 62.5
2nd
A 115 117 112 57B 115 116 108 62C 119 110 115 62D 117 110 103 64Average 116.5 113.25 109.5 61.25
3rd
A 119 117 104 59B 112 114 108 60C 113 116 104 60D 113 113 112 60Average 114.25 115 107 59.75
113.33 114 105.5 61.17[°F] 236.00 237.20 221.90 142.10
Volume of Condensate (mL) 910 930 940 1070Outside Diameter, in. 1.315 1.315 2.875 3.1875
ft 0.110 0.110 0.240 0.266Room Temperature 33.7 92.66
Emissivity 0.88 0.96 0.26 0.16LE 0 -2.197802 -3.296703 -17.58242
2.525835 2.531105 2.024111 1.5513210.032164 0.035527 0.008182 0.00187
Average Surface Temp [°C]
hc [ Btu/hr.ft^2.°F]hr [ Btu/hr.ft^2.°F]