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Copper Tubes - Uninsulated Heat Losses

Heat loss from uninsulated copper pipes - dimensions ranging 1/2 - 4 inches.

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Heat loss at various temperature differences between pipe and ambient air for 1/2" to 4" copper tubes - or pipes - are indicated below:

Note that it is temperature difference that is used - and that 1 ^oC of temperature difference equals to 1.8 ^oF temperature difference.

Nominal bore		Heat loss for the fluid inside pipe (W/m)			Heat loss for the fluid inside pipe (Btu/hr ft)
Nominal bore		Temperature difference (^oC)			Temperature difference (^oF)
(mm)	(inches)	22	38	55	40	68	99
15	1/2	21	32	45	22	34	47
22	3/4	28	43	60	29	45	64
28	1	34	53	76	36	56	79
35	1 1/4	41	64	89	43	67	93
42	1 1/2	47	74	104	49	77	108
54	2	59	93	131	62	97	136
67	2 1/2	71	111	156	74	116	162
76	3	83	129	181	87	135	189
108	4	107	165	232	111	172	241

Example - Heat Loss from a 2" Pipe

A 2" pipe with temperature 75 ^oC (167 ^oF) is located in a room with temperature 20 ^oC (68 ^oF). The temperature difference between the pipe and the ambient room is 55 ^oC (99 ^oF).

The heat loss from the pipe to the room can be estimated from the table (or chart) above to 131 W/m.

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Related Topics

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