What is the COP of Heat Pump

  • By:Heyi
  • Date:2021/08/04

What is COP?

COP refers to the ratio of the heating capacity to the power consumption of the air source heat pump water heater.

The COP value is a very important parameter in the home appliance industry. In the air energy water heater, the COP represents the heating performance coefficient. When the air-energy heat pump water heater works in a cycle, its heating performance coefficient COP refers to the ratio of the heating capacity of the compressor to the compressor shaft power PE under a certain working condition.

To put it simply, the COP value of an air source water heater is actually the ratio of the heating capacity and the input power achieved by the heat pump system. Under the same working conditions, the larger the ratio, the higher the efficiency and energy saving of the heat pump system.


How to calculate COP?

Its calculation formula is: εs=Q0/Ne=Q0/N0·ηs=ε0·ηs.

Q0: The cooling capacity (heating capacity) required by the cooling system

N0: Theoretical power of the refrigeration compressor

Ne: shaft power

ε0: is the theoretical cooling coefficient (heating coefficient)

ηs: is the total efficiency (adiabatic efficiency)

The COP value (cooling efficiency) is actually the ratio of the cooling capacity (heating capacity) to the input power that the heat pump system can achieve. Under the same working conditions, the larger the ratio, the higher the efficiency of the heat pump system, the more energy-saving it is; Before comparing the COP value of the refrigeration system, it is necessary to first determine whether each heat pump system is under the same working conditions, and then perform the calculation and comparison.


How to improve COP?


How to further increase the COP value to help families or businesses reduce power consumption and thus reduce electricity bills, let’s talk about it in detail:


  • 1. The heat carrier refrigerant plays a key role in the entire heat pump system, and the heat carrier refrigerant is required to have the properties of a refrigerant in addition to: the unit heat absorption should be large, the heat absorption and release should be faster and more; evaporation The temperature (two states of refrigerant: liquid and gas transition temperature point) should be low (it can still absorb heat at -10°C); while producing hot water at 65°C, the critical pressure of the refrigerant is required to be low, which is lower than that of ordinary heat pump systems The protection pressure is 2.6MPa (compressor protection pressure is 2.8MPa), otherwise the pressure is too high, which is not good for the compressor or makes the compressor enter high-pressure protection and cannot make high-temperature hot water, or even the compressor is damaged by working under high pressure for a long time.


  • 2. For evaporators with larger heat exchange area, the larger the surface area in contact with the air, the more heat can be transported under the same conditions, and the higher the energy efficiency ratio COP value will be, the more energy-saving it will be.


  • 3.Regular maintenance of heat pumps: The compressor, the key component of the heat pump unit, requires good performance indicators such as compressor displacement, cooling capacity, energy efficiency ratio, and rotation rate, and must match the entire system and the refrigerant used, otherwise the refrigerant will have a corrosive effect on copper. , damage the heat pump system.It is very important to have qualified technicians provide services for your air source heat pump, usually at least once a year. This will help ensure that it operates at maximum efficiency and does not consume more than necessary energy.


  • 4.the refrigerant must be environmentally friendly. Environmentally friendly refrigerants mainly include R410a, R134, etc. The common refrigerant R22 in the past is a refrigerant that pollutes the environment, and the effect is not as good as the latest R134 and R410a. Developed regions such as Europe and the United States have banned the use of these polluting refrigerants.


  • 5.Insulating the house as much as possible can help keep heat indoors for as long as possible, thus reducing the demand for heat pumps to provide the required indoor temperature and use less energy.


Maximizing the benefits of air source heat pump COP

Improving the COP of air source heat pumps can also provide other benefits, such as:

Reduce energy costs

  • Maximizing the COP of an air source heat pump means reducing electrical input power, which in turn can reduce operating costs by minimizing electricity consumption.
  • However, as the outdoor temperature changes throughout the year, energy costs will also change accordingly.

Reducing greenhouse gas emissions

  • Using less electricity to power a heat pump means less emissions, depending on the location and method of power generation.





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