Thermal Constants

Table of Thermal Conduction Values for Common Substances

Substance

K ( W/m. K)

Air

0.024

Aluminium

237

Antimony

18.5

Beryllium

218

Brass

110

Cadmium

92

Cobalt

69

Constantan

22

Copper

398

Gold

315

Iridium

147

Cast Iron

55

Pure Iron

80.3

Wr’t Iron

59

Lead

35.2

Magnesium

156

Molybdenum

138

Monel

26

Nickel

90.5

Platinum

73

Silver

427

C. Steel

50

St. Steel

25

Tin

67

Water

0.58

Zinc

113

Table of Overall Heat Transfer Coefficients for some common Fluids and Heat Exchanger Surfaces [45]

Fluid

Transmission Surface

Fluid

Uo (W/m2 K)

Water

Cast Iron

Air or Gas

7.9

Water

Mild Steel

Air or Gas

11.3

Water

Copper

Air or Gas

13.1

Water

Cast Iron

Water

230-280

Water

Mild Steel

Water

340-400

Water

Copper

Water

340-455

Air

Cast Iron

Air

5.7

Air

Mild Steel

Air

7.9

Steam

Cast Iron

Air

11.3

Steam

Mild Steel

Air

14.2

Steam

Copper

Air

17

Steam

Cast Iron

Water

910

Steam

Mild Steel

Water

1050

Steam

Copper

Water

1160

Steam

Stainless Steel

Water

680

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