(Redirected from EFI System partition) The EFI system partition (ESP) is a partition on a data storage device (usually a hard disk drive or solid-state drive) that is used by computers adhering to the Unified Extensible Firmware Interface (UEFI).
As much as 80 to 90% of the electrical energy used by an air compressor is converted to heat. A properly designed heat recovery unit can recover 50 to 90% of this heat for heating air or water.
Divide this number by 1,000 to get 9.9 kilowatt hours. Discover the cost of running the compressor by multiplying the kilowatt hours used by the rate charged by your utility company. Using a rate of 7.2 cents/kWh, the example of 9.9 kWh comes out to 0.072 x 9.9 = $0.71 -- or 71 cents -- for three hours of running time.