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COP of Chiller or Efficiency Of Process Chiller

Efficiency of Process Chiller

  Chiller is a machine that removes heat from water or air via vapor-compression cycle or vapor-absorption cycle.This cooled water or air further used for cooing purpose for equipment or for Chillers are widely used in every field like in industry, commerce and in building air conditioning.Air conditioning and chillers both are the heat pumps, chiller uses water for heat exchange media and air conditioning uses air . After the heat exchange process waste heat exhausted in ambient or recovered it for heating purpose.


    Chillers efficiency depends on the energy consumed by the chiller and cooling delivered by the chiller in that consumed energy.The chiller efficiency always measured in "COP" which stands for 

Coefficient Of Performance.

   Coefficient of performance is just simple, it is the ratio of refrigeration effect produced by the chiller to the energy consumed by the chiller to produce that refrigeration effect.Both units are used in Kw.

  Take a example for calculations of Chiller Efficiency, the Chiller which is producing cooling effects of 1250 kw/h or 42,65,177.5 in a metric unit. The electrical energy required to produce that effect is 230 kw, then the COP of Chiller is,

   COP =(Cooling effects produced by chiller)÷Electrical Energy required 


   COP= 1250÷230
COP=4.5

  This means that the 4.5 kw of Refrigeration effect is produced in a 1kw of electrical energy input.

Factors Affecting on Chiller Efficiency

  •     For reducing Chiller efficiency we need to know the purpose of Chiller is that the remove heat from the water or air which is further used for the cooling or chilling purpose. The main power consumption source in Chiller is compressor which lift the refrigerant through system from low pressure and temperatures to high pressure and temperature refrigerant from evaporator to Condenser. That's why our compressor should be in proper working conditions that means time to time servicing for compressor required. Which will keep your compressor efficient working. 
  •   Another factors Affecting on Chiller efficiency is the cooling water temperature comes from cooling tower to Chillers Condenser. If your cooling water temperature will not in its regular working range, then it will produce high Discharge pressure from compressor which will affect on the efficiency of Chiller.
  • Chiller Condenser and evaporator should be cleaned time to time for proper heat exchange. Dirty Condenser and evaporator will produce excessive load on compressor to produce required cooling effects. That leads Chiller to consume more electrical power to produce required Refrigeration effects. 







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