Potterton Isis HE Installation, Operation & Maintenance Manual page 35

HEAT
1 Therm = 100,000 Btu/hr
FUEL CONSUMPTION
1 dm 3 = 1 LITRE
3 3
1,000 dm = 1m
PRESSURE
1 PSI = 2.307 FT
1 kPa = 1000 Pa
1 bar = 1000 mbar = 100 kPa
LENGTH
1m = 1000mm
VOLUME
AREA
FLOW RATE
1 kg/sec = 1 lit/sec @
0°C reference temperature
TEMPERATURE
TEMPERATURE DIFFERENCE
1°C = 1 o K
WEIGHT
CONVERSION TABLE
IMPERIAL TO METRIC
1 Btu/hr = 0.2931 W
1 Btu = 1055 J
1 Btu/hr = 0.252 kcal/hr
1 ft 3 = 28.317 dm
1 UK Gall = 4.546 litre
1 UK Gall = 1.2 U.S. Gallon
2
1 lb/in = 6895 Pa
2
1 lb/in = 68.95 mbar
1 in.w.g. = 249.1 Pa
1 in.w.g. = 2.491 mbar
1 in.w.g = 25.4 mm.w.g.
1 inch = 25.4mm
1 ft = 0.3048 m
1 yard = 0.9144 m
1 mile = 1.609 km
3
1 ft = 0.02832 m
3
1 ft = 28.32 litre
2
1 in = 645.2 mm
2
1 in = 6.452 cm
1 ft 2 = 929 cm
2
1 ft = 0.0929 m
1 gall/min = 0.07577 lit/sec
3
1 ft /min = 0.4719 lit/sec
1 ft 3 /min = 0.00047 m
°F to °C = ("X"°F - 32) x 0.5556
"X"°F x 0.5556 = °C
1 lb = 0.4536 kg
1 cwt = 50.8 kg
1 ton = 1016 kg
METRIC TO IMPERIAL
1 kW
1 J
1 kcal/hr
3 (litre) 1 m 3
1 litre
Gallon
1 bar
1 kPa
1 bar
1 Pa
1 mm.w.g.
1 mm.w.g.
1 mm
1 m
1 m
1 km
3 3
1 m
1 litre
2 2
1 mm
2 2
1 cm
2 1 m 2
2 2
1 m
1 lit/sec
1 lit/sec
3 /sec 1 m 3 /sec
°C to °F
"X" °C x 1.8
1 kg
1 tonne
1 tonne
= 3412 Btu/hr
= 0.0009478 Btu
= 3.968 Btu/hr
= 35.3147 ft 3
= 0.2199 Imp.
= 33.45 ft.w.g.
= 0.3345 ft.w.g.
= 14.5 lb/in 2
= 0.3858 in.w.g.
= 0.0394 in.w.g.
= 9.8 Pa
= 0.03937 in
= 3.281 ft
= 1.094 yard
= 0.6214 mile
3
= 35.3147 ft
3
= 0.03531 ft
2
= 0.00155 in
2
= 0.155 in
= 1550 in 2
2
= 10.76 ft
= 13.2 gall/min
3
= 2.119 ft /min
= 2119 ft 3 /min
= ("X" °C x 1.8) + 32
= °F
= 2.205 lb
= 0.9842 ton
= 2204.6 lb