Heat Transfer coefficients – Overal Heat Transfer Coefficient –U

Used for informational reference only

TypesApplicationOverall Heat Transfer Coefficient - U -
W/(m2 K)Btu/(ft2 oF h)
"Tubular, heating or cooling"Gas at atmospheric pressure inside and outside tubesMay-356-Jan
Gas at high pressure inside and outside tubes150 - 50025 - 90
Liquid outside (inside) and gas at atmospheric pressure inside (outside) tubes15 - 7015-Mar
Gas at high pressure inside and liquid outside tubes200 - 40035 - 70
Liquids inside and outside tubes150 - 120025 - 200
Steam outside and liquid inside tubes300 - 120050 - 200
"Tubular, condensation"Steam outside and cooling water inside tubes1500 - 4000250 - 700
Organic vapors or ammonia outside and cooling water inside tubes300 - 120050 - 200
"Tubular, evaporation""steam outside and high-viscous liquid inside tubes, natural circulation"300 - 90050 - 150
"steam outside and low-viscous liquid inside tubes, natural circulation"600 - 1700100 - 300
"steam outside and liquid inside tubes, forced circulation"900 - 3000150 - 500
Air-cooled heat exchangersCooling of water600 - 750100 - 130
Cooling of liquid light hydrocarbons400 - 55070 - 95
Cooling of tar30 - 6010-May
Cooling of air or flue gas60 - 18030-Oct
Cooling of hydrocarbon gas200 - 45035 - 80
Condensation of low pressure steam700 - 850125 - 150
Condensation of organic vapors350 - 50065 - 90
Plate heat exchangerliquid to liquid1000 - 4000150 - 700
Spiral heat exchangerliquid to liquid700 - 2500125 - 500
condensing vapor to liquid900 - 3500150 - 700
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