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Calcimator

Geothermal COP Calculator

Calculate coefficient of performance from source and delivery temperatures.

Inputs

°F
°F
BTU/hr
kW

Results

System COP

4.67

Total Power Draw

3.01 kW

≈ 3 microwaves

Compressor COP5.6
Carnot COP (ideal)11.2
EER15.9
How to Use This Calculator
  1. Enter the heat output delivered by the heat pump in BTU/hr or kW.
  2. Input the electrical power consumed by the compressor in kW.
  3. Review the Coefficient of Performance (COP) — higher COP means more efficient operation.
  4. Compare the COP to the fuel-equivalent efficiency of your existing heating system.
  5. Geothermal heat pumps typically achieve a COP of 3–5, equivalent to 300–500% efficiency.

How the result changes with Delivery Temperature

Delivery TemperatureSystem COPTotal Power Draw
689.641.46 kW
885.742.45 kW
1123.963.55 kW
1323.24.4 kW

What each input means

Source Temperature
Entering water temperature from ground loop.
Delivery Temperature
Leaving air or water delivery temperature.
Mode
Operating mode of the heat pump.
System Capacity
Heat pump capacity in BTU per hour.
Circulating Pump Power
Electrical power consumed by the ground loop pump.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Source Temperature = 50, Delivery Temperature = 100, Mode = 0, System Capacity = 48000 = 5 input(s) provided
  2. Calculate System COP
    System COP
    4.67 = 4.67
  3. Calculate Total Power Draw
    Total Power Draw
    3.01 = 3.01
  4. Calculate Compressor COP
    Compressor COP
    5.6 = 5.6
  5. Calculate Carnot COP
    Carnot COP
    11.2 = 11.2

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