Where can I find COP of Carnot heat pump?
For a heat pump operating at maximum theoretical efficiency (i.e. Carnot efficiency), it can be shown that: COP=Q/W=Thot/(Thot−Tcold).
What is COP of Carnot cycle?
The COP of a Carnot refrigeration cycle is a function only of the upper and lower temperatures of the cycle, and it is true that the reversed Carnot cycle is the most efficient refrigeration cycle operating between these two specified temperature levels.
What is the COP of heat pump?
The Co-efficient of performance (COP) is an expression of the efficiency of a heat pump. When calculating the COP for a heat pump, the heat output from the condenser (Q) is compared to the power supplied to the compressor (W). COP = |Q| W.
Is a heat pump a Carnot cycle?
Refrigerators and heat pumps are essentially the same device; they only differ in their objectives. Reversing the Carnot cycle does reverse the directions of heat and work interactions. A refrigerator or heat pump that operates on the reversed Carnot cycle is called a Carnot refrigerator or a Carnot heat pump.
What is the maximum COP for a heat pump?
about 4.5
In fact, the highest COP a heat pump can achieve is about 4.5. Any heat pump with a COP of above 3 has very high energy efficiency.
Can COP of heat pump be less than 1?
Thus, we can say that the COP of the refrigerator and air-conditioner can be less than one or greater than one. The above formula also shows that the COP of the heat pump can never be less than one; it is always more than one.
How can COP be greater than 1?
The COP usually exceeds 1, especially in heat pumps, because, instead of just converting work to heat (which, if 100% efficient, would be a COP of 1), it pumps additional heat from a heat source to where the heat is required. Most air conditioners have a COP of 2.3 to 3.5.
Why can COP be greater than 1?
The COP usually exceeds 1, especially in heat pumps, because, instead of just converting work to heat (which, if 100% efficient, would be a COP of 1), it pumps additional heat from a heat source to where the heat is required.
Why is the heat pump COP less than 1?
For few unconventional cycles such as vapour absorption cycle, the COP can be less than 1. But since vapour absorption cycles are generally heat-operated, they become economic because cost of energy input is low. In case of heat pumps, the COP is always greater than 1 in accordance with second law of thermodynamics.
Is a higher or lower COP better?
Coefficient of Performance (COP) is the efficiency ratio of the amount of heating or cooling provided by a heating or cooling unit to the energy consumed by the system. The higher the Coefficient of Performance the more efficient the system.
Why COP is used instead of efficiency?
Efficiency is a dimensionless obtained by dividing two quantities of same units. The Coefficient of Performance (COP) can depend on numerous other variables and can be used to easily compare the performance of two different units, or the same unit under different conditions.