Compressor heat recovery calculator

Use this calculator to estimate energy and cost savings from implementing compressor heat recovery. Enter your compressor and heating system parameters to see the annual fuel savings analysis.

Compressor Parameters

Compressor Motor Power (hp_comp):

Nameplate motor rating

Load Factor (LF):

Average fraction of full load while running (TRM default 0.92)

Recovery Efficiency (RE):

Fraction of input energy recoverable as useful heat (TRM default 0.80)

Operating Hours & Location

Location:

Representative city (NY, NJ & New England)

Operating Schedule:

Coincident Heating Hours (hrs):

Compressor hours coincident with heating (auto-filled from location + schedule; hours below a 63°F balance point from 2014–2023 climate normals). Set schedule to Custom to override.

Distribution Fan

Distribution Fan Motor (hp_fan):

Added fan to distribute recovered heat. Use 0 if no fan, or the net hp if an existing fan is reused.

Fan Motor Efficiency (Eff_fan):

NEMA nominal full-load efficiency (TRM default 0.855 for 1 hp)

Heating System Displaced

Heating Fuel Type:

Electricity Cost ($/kWh):

Used to cost the fan penalty (and electric heating, if selected)

Heating System Efficiency (Eff_heating, %):

Thermal efficiency of the displaced system (TRM default 80%)

Fuel Cost ($ per unit):

$/MMBtu for natural gas

Heat of Combustion (Btu/unit):

1,000,000 Btu/MMBtu (by definition)

Results Summary

Compressor Input Power:

74.6 kW

Recovered Heat (avg load):

0 Btu/hr

Coincident Heating Hours:

0 hrs

Annual Heat Recovered

0 MMBtu

Annual Fuel Displaced

0 MMBtu

Fan Energy Penalty

0 kWh

ΔkWh (electric)

0 kWh

ΔMMBtu (fossil)

0 MMBtu

Net Annual Savings

Peak coincident demand savings are N/A for this measure (space-heating load only) and are not claimed.