BTU : British Thermal Unit

A measure of heat energy; the amount needed to raise the temperature of one pound of water by one degree Fahrenheit.
HP : The work done per unit of time.
1 horsepower equals 33,000 foot-pounds of work per minute or approximately 746 watts.
Motors for pumps are rated in horsepower.

KWH : A kilowatt hour is a unit of energy.
It is equal to 1000 watts being used for one hour.
This would be equivalent to having ten 100-watt light bulbs on for one hour or one 100-watt light bulb on for ten hours.

refrigeration formula(btu=>hp,etc)
KCAL : A kilogram-calorie is the amount of heat needed to raise the temperature of one kilogram of water (1 liter) by 1 degree Celsius.
PSI : "pounds_per_square_inch" a unit of pressure(mutch used in UK)

1 hp h = 0,7457 kWh
1 Btu = 0.293 W
1 kWh = 3,412 Btu
1 kcal = 3,9683 Btu
1 psi = 0.0689476 Bar

1/8 hp is 0.7457 kW / 8= 0,09321 KW =>93W

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