What is the optimum temperature range for the heat distribution in a heat pump installation?

The majority of heat pumps have an operating temperature limit of 50°C – 55°C in most applications. Reducing the output temperature required from the heat pump will increase its performance; ideally the flow temperature should be 35°C for UFH systems and 45°C for Fan coil/Low temperature radiator systems.

What effect does a lower outdoor temperature have on the COP of a heat pump?

As the outdoor air temperature drops, the heat pump needs to work harder, so it becomes less efficient. The COP continues to drop until we reach an outdoor temperature of -4°F (-20°C).

What is the supply air temperature for an air source heat pump?

The coils of your heat pump operate at lower heat levels than fossil fuel systems. Air at the supply grills almost always has a temperature ranging from 85° to 106°F in the winter.

How does the return temperature affect the cop?

In order to achieve higher COPs, two (or more) heat pumps are often connected in series. Each heat pump then can operate with a smaller temperature difference. In such a case, the DH return temperature will also influence the overall COP. A lowered return temperature results in a lower condensing temperature for the first heat pump in the series.

How can the COP of a heat pump be improved?

As can be seen, the COP of a heat pump system can be improved by reducing the temperature difference (T hot – T cold ). Therefore, reducing the output temperature (T hot) is very efficient, but requires very efficient heat transfer from heat pump system to surroundings (i.e. use of piped floor).

What does cop stand for in heat pump?

For cooling, Q represents the heat that we take away from a cold reservoir. Air conditioner, for example, takes heat away from a room (cold reservoir). Note: COP for heating and COP for cooling may be different. The best mini-split heat pumps, for example, are capable of cooling down space as well as heating it.

What should the temp be in an indoor heat pump?

The air leaving the indoor coil will be typically between 80 and 100 degrees. As the temperature outside drops so does the coefficient of performance (COP), making it more expensive but giving about the same heat.