Design Calculators - Mechanical

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Chiller Capacity and COP Calculator

This calculator determines the cooling capacity, Coefficient of Performance (COP), and Energy Efficiency Ratio (EER) of a chiller. It allows input based on chilled water flow rate and temperature difference, or directly from the cooling load and power input.

Key Inputs:

  • Chilled Water Flow Rate: Flow rate of water through the chiller evaporator.
  • Chilled Water Inlet Temperature (\(T_{in}\)): Temperature of water entering the chiller.
  • Chilled Water Outlet Temperature (\(T_{out}\)): Desired temperature of water leaving the chiller.
  • Chiller Power Input (\(P_{in}\)): Electrical power consumed by the chiller.
  • Specific Heat of Water (\(c_p\)): Assumed constant (4.186 kJ/kg°C or 1 Btu/lb°F).
  • Density of Water (\(\rho\)): Assumed constant (1000 kg/m³ or 8.34 lb/gal).

Calculated Outputs:

  • Cooling Capacity (\(\dot{Q}\)): The rate of heat removal by the chiller.
  • Coefficient of Performance (COP): Ratio of cooling output to power input (dimensionless).
  • Energy Efficiency Ratio (EER): Cooling output in Btu/hr per Watt of power input.
  • kW/ton: Power input in kW per ton of cooling (Imperial efficiency metric).

Chilled Water Parameters

Calculation Results

Parameter Value