Related Resources: heat transfer

Heat Loss from Bare Steel Pipe

Heat Transfer

Heat Loss from Bare Steel Pipe to Still Air at 80°F, Btu/h· ft

Also See:

Pipe Size,
in
Pipe Inside Temperature, °F
180
280
380
480
580
1/2
56.3
138
243
377
545
3/4
68.1
167
296
459
665
1
82.5
203
360
560
813
1 1/4
102
251
446
695
1010
1 1/2
115
283
504
787
1150
2
141
350
623
974
1420
2 1/2
168
416
743
1160
1700
3
201
499
891
1400
2040
3 1/2
228
565
1010
1580
2310
4
254
631
1130
1770
2590
4 1/2
281
697
1250
1960
2860
5
313
777
1390
2180
3190
6
368
915
1640
2580
3770
7
421
1040
1880
2950
4310
8
473
1180
2110
3320
4860
9
525
1310
2340
3680
5400
10
583
1450
2610
4100
6000
12
686
1710
3070
4830
7090
14
747
1860
3340
5260
7720
16
850
2120
3810
6000
8790
18
953
2380
4270
6730
9870
20
1060
2630
4730
7460
10,950
24
1260
3150
5660
8920
13,100

Conversion

Qty
Reference
Unit
is
equal
to
Conversion
Factor
Unit
1
BTU/hour square foot °F
=
1
BTU/hour square foot °F
1
=
0.000135622991
calorie/second square centimeter °C
1
=
1
CHU/hour square foot °C
1
=
5.678263398
joule/second square meter K
1
=
0.45359237
kilocalorie/hour square foot °C
1
=
4.88242768
kilocalorie/hour square meter °C
1
=
5.678263398
watt/square meter K
1
=
5.678263398
watt/square meter °C

Conversion of units

Qty Unit is
equal
to 		Conversion
Factor 		Reference
Unit
1 BTU/hour square foot °F = 1 BTU/hour square foot °F
1 calorie/second square centimeter °C = 7373.3810965421
1 CHU/hour square foot °C = 1
1 joule/second square meter K = 0.17611018191798
1 kilocalorie/hour square foot °C = 2.2046226007073
1 kilocalorie/hour square meter °C = 0.20481614157061
1 watt/square meter K = 0.17611018191798
1 watt/square meter °C = 0.17611018191798

Related:

Reference:

  • ASHRAE Fundamental Handbook, 2019

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