When we choose the air energy heat pump unit, we often hear people say that the higher the COP value and IPLV value of the air energy heat pump, the better the performance of the unit. So what exactly does COP value and IPLV value refer to?
What is COP value
Coefficient of Performance (COP)
COP is a measure of the performance of a heat pump in terms of heat production, and its unit is (W/W).
The
COP of an air heat pump is the coefficient of performance of the heat
pump, which is the ratio of the amount of heat produced in the heating
cycle to the amount of power consumed in the heating cycle.The higher
the COP value, the higher the amount of heat produced with the same
amount of power consumed, which means that the air conditioner has a
better heating performance. For example, a heat pump heat is 6000W,
heating power is 2000W, energy efficiency (COP) is 6000/2000 = 3.0. COP
value is greater, that is, get the same heat, the smaller the amount of
power paid, and also more energy-saving.
What is IPLV value
Integrated Partial Load Factor (IPLV), because the heat pump equipment in practice can not always work under the maximum load condition (100% load), there may be a lot of times the unit only works under 75%, 50% and other loads. The unit EER, COP is defined under the nominal working condition (nominal working condition is a unit test condition stipulated by the state, which is different from the maximum load condition), and it cannot fully reflect the operating efficiency of the unit, thus the American Heating and Refrigeration Institute (AHRI) and the American Society of HVAC Engineers (American Society of Heating and Refrigeration Engineers, AHRI) and the American Society of HVAC Engineers (American Society of HVAC Engineers, AHRI) are not able to reflect the efficiency of the unit. Therefore, the American Heating and Refrigeration Institute (AHRI) and the American Society of Heating Refrigerating and Air-conditioning Engineers (American Society of Heating Refrigerating and Air-conditioning, ASHRAE) put forward the concept of Integrated Partial Load Variables (IPLV), which can be used to measure the operating effect of refrigeration and heat pump units under partial load conditions.
Calculation formula
The formula for calculating the integrated partial load factor (IPLV) is: IPLV = 1.2% × A + 32.8% × B + 39.7% × C + 26.3% × D
In the formula
A -- Performance coefficient at 100% load, kW / kW, cooling water inlet temperature 30°C / condenser inlet dry bulb temperature 35°C;
B -- coefficient of performance at 75% load, kW / kW, cooling water inlet temperature 26℃ / condenser inlet dry bulb temperature 31.5℃;
C - coefficient of performance at 50% load, kW / kW, cooling water inlet temperature 23°C / condenser inlet dry bulb temperature 28°C;
D - Performance factor at 25% load, kW / kW, cooling water inlet temperature 19°C / condenser inlet dry bulb temperature 24.5°C;
