The discussion clarifies the use of the Coefficient of Performance (COP) formulas for refrigerators and heat pumps. For a refrigerator, the formula is COP = Qc/W, where Qc is the heat extracted from the cold reservoir and W is the work input. In contrast, for a heat pump, the formula is COP = Qh/W, which can also be expressed as COP = (Qc + W)/W = Qc/W + 1, indicating that the output includes both the heat extracted and the work input. Understanding these distinctions is crucial for applying the correct formula based on the system's function.
PREREQUISITESEngineers, HVAC professionals, and students studying thermodynamics who seek to understand the performance metrics of refrigeration and heat pump systems.
If you think of COP as: output/input you will avoid confusion. If it is a heat pump, the output is the heat flow to the hot reservoir. If it is a refrigerator the output is the heat flow from the cold reservoir. The input is the work done.ChunkymonkeyI said:Homework Statement
I just want to know when do I use the formula for COP refrigerator vs COP Heat pump. If the heat is absorbing something then what formula do I use