Copper Pipes and Heat Loss

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Heat loss from copper tubes at various temperature differences between tube and air

Values from the table below can be used to indicate the heat losses from uninsulated copper pipes:

Nominal bore		Heat loss for fluid inside pipe
		(W/m)			(Btu/hr.ft)
		Temperature difference (^oC)			Temperature difference (^oF)
(mm)	(inches)	22	38	55	70	100	130
15	1/2	21	32	45	22	34	47
22	3/4	28	43	60	29	45	53
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

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