Determine boiler horsepower from heat transfer area
Boiler horsepower is used rating a boiler's capacity to deliver steam to a steam engine.
The amount of energy needed to produce 34.5 pounds (15.65 kg) of steam, per hour, at a pressure and temperature of 0 psig (0 bar) and 212oF (100oC), with feed water at 0 psig and 212oF. One boiler horsepower is about 33,475 btu per hour (about 9,811 watts, 8436 kcal/hr).
Boiler horsepower can be determined from the heat transfer area
PBoHP = A / 17 (1)
PBoHP = boiler horsepower
A = heat transfer area (ft2)
PBoHP tends to be used only in the USA, Australia, and New Zealand. Be aware that the a boiler horsepower is not the commonly accepted 550 ft lbf/s and the generally accepted conversion factor of 746 Watts = 1 horsepower does not apply.
Boiler Conversion Ratios
|sq.ft. EDR steam||240||Btu per hr.|
|sq. ft. EDR water||160||Btu per hr.|
|Boiler hp||33.5||MBtu per hr.|
|Boiler hp||140||sq.ft. EDR steam|
|Boiler hp||223||sq.ft. EDR steam|
|Boiler hp.||34.5||lb. per hr. steam|
|lb. per hr. steam||970||Btu per hr.|
|to||divide by above||from|