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The following tables illustrate conversion factors often needed for thermal calculations.

You will find these tables to be a useful reference when selecting a cold plate, recirculating chillercooling system or heat exchanger for your application.

Conversion Factors

MULTIPLY BY TO OBTAIN
Watts 3.412 BTU/hr
Watts/°C 1.896 BTU/hr°F
Horsepower 745 Watts
CFM (Cubic Feet per Minute) 0.028 m³/min
PSI (Pounds per Square Inch) 0.069 Bars
PSI (Pounds per Square Inch) 27.68 Inches of Water
GPM (Gallons per Minute) 3.785 LPM (Liters per Minute)
Ft³ (Cubic Feet) 7.48 Gallons
Pressure Head (Feet of Water) 0.434 PSIG
Inches of Water 249 Pascals
In. (Inches) 25.4 mm (millimeters)
lbs (Pounds) 0.454 kg (kilograms)
Tons of Refrigeration 12,000 BTU/Hr
°F (Fahrenheit) 5/9 (°F-32) °C
°C (Celsius) (1.8 x °C)+32 °F
Cp (BTU/lb°F) 4.18 J/kg°C
Density (lb/ft³) 16.018 kg/m³
ΔT (°C) 1.8 ΔT (°F)
Mass Flow (lb/hr) 0.000126 kg/sec

Temperature Conversion

°C °F
-40 -40
-30 -22
-20 -4
-10 14
0 32
10 50
20 68
30 86
40 104
50 122
60 140
70 158
80 176
90 194
100 212
110 230
120 248
130 266
140 284
150 302
160 320
170 338
180 356