Originally Posted by a64pilot
Hp Hours ?
Horse Power hours.
The same dimensions as Watt hours, BTUs or calories.
1 HP hour = 745.7 Watt hours = 2,544 BTU = 641.62 kilo calories. (Take your pick)
It's the energy produced by 1 Horse Power in 1 hr.
It's useful if you are working with an engine
rated in HP.
As an example, an approximation for fuel consumption
of a diesel engine
is 0.225 litres per hour per horsepower.
If I run one of my 40 HP Yanmars at 2800 RPM
, I know it is generating about 16 HP *. If I run it for 1 hour. that's 16 HP hours which equates to 16 x 0.225 = 3.6 litres of diesel
If I run it for 2 hours, that 32 HP hours = 7.2 litres.
* based on HP = Max HP x cube root of (RPM/Max RPM)