Can efficiency of refrigerator be greater than 1?

If you analyze a refrigerator as a closed system and measure the changes in temperature and entropy in both high temperature and low temperature recipients you will realize that its efficiency is not greater than one.

What is the maximum COP of refrigerator?

For a refrigerator keeping an inside temperature of 4 oC = 277 K operating in a room at 22 oC = 299 K the best possible coefficient of performance is COPmax = 277/(299 – 277) = 12.6. The best possible ratio of the amount of heat removed to the work done is 12.6.

Can the COP be greater than unity?

Coefficient of Performance (COP) The pragmatic definition of the COP is: COP = (What you Get)/(What you Pay For). This measure of performance can have a value greater than unity, and it is this fact that makes a heat pump an attractive device.

Why COP is used instead of efficiency?

In case of a refrigerator ,COP is the ratio of heat absorbed (desired paramter from the sysem ) to work done on the system ,Here the important criteria is heat abosorbed or refrigeration effect. That’s why we use the coefficient of performance instead of efficiency.

Can the value of COP of heat pump be less than 1?

The above formula also shows that the COP of the heat pump can never be less than one; it is always more than one. It is worth mentioning here that efficiency of the engine can never be more than one, but the COP of the heat pump is always more than one.

Can the COP of a heat pump be less than 1?

In case of heat pumps, the COP is always greater than 1 in accordance with second law of thermodynamics. Coefficient Of Performance (COP) is the ratio of “Coldness” produced to the “Heat” or ” Work” supplied.

What is COP of refrigeration cycle?

Coefficient of Performance The COP is determined by the ratio between energy usage of the compressor and the amount of useful cooling at the evaporator (for a refrigeration instalation) or useful heat extracted from the condensor (for a heat pump). A high COP value represents a high efficiency.

What does COP stands for and how we calculate COP of refrigerator?

Coefficient Of Performance
COP stands for Coefficient Of Performance and indicates the efficiency of heating and cooling machines.