# Relationship between C.O.P. and outside air temperature

• timsea81
In summary, the coefficient of performance (C.O.P.) is a measure of the efficiency of a heating or cooling system and is directly affected by the outside air temperature. A higher outside air temperature can increase the C.O.P. for cooling systems, while a lower outside air temperature can increase the C.O.P. for heating systems. Extreme outside air temperatures can negatively impact the C.O.P. of both heating and cooling systems, and there is no single ideal temperature for achieving the highest C.O.P. However, moderate outside air temperatures tend to result in the highest C.O.P. for both types of systems. Understanding this relationship can help improve energy efficiency and reduce costs and environmental impact.
timsea81
Since the capacity of an air conditioner is a function of outside air temperature, does it follow that greater efficiency will be achieved by putting the condenser under shade rather than out in the open or on a hot roof? Or does the casing of the unit provide adequate shading to make this difference negligible?

COPmax = Te/(Tc-Te)
This is the maximum achievable COP.
Te is evaporator temperature
Tc is condenser temperature
Generally, Te = Trequired - 10
Tc = Tambient + 10
Yes ! it will

## 1. What is the relationship between C.O.P. and outside air temperature?

The coefficient of performance (C.O.P.) is a measure of the efficiency of a heating or cooling system. It is directly related to the outside air temperature in that a higher outside air temperature can result in a higher C.O.P. for cooling systems, while a lower outside air temperature can result in a higher C.O.P. for heating systems.

## 2. How does the outside air temperature affect the C.O.P. of a heating system?

A lower outside air temperature can result in a higher C.O.P. for a heating system because the system does not have to work as hard to raise the temperature of the air to the desired level. This means that less energy is required to achieve the same amount of heating.

## 3. Can the C.O.P. of a cooling system be affected by extreme outside air temperatures?

Yes, extremely high outside air temperatures can negatively impact the C.O.P. of a cooling system. This is because the system has to work harder to cool the air to the desired temperature, resulting in higher energy consumption and a lower C.O.P.

## 4. Is there an ideal outside air temperature for achieving the highest C.O.P. for heating and cooling systems?

There is no single ideal outside air temperature for achieving the highest C.O.P. as it can vary depending on the specific system and its operating conditions. However, in general, moderate outside air temperatures (around 50-70 degrees Fahrenheit) tend to result in the highest C.O.P. for both heating and cooling systems.

## 5. How can understanding the relationship between C.O.P. and outside air temperature help with energy efficiency?

By understanding the relationship between C.O.P. and outside air temperature, you can make more informed decisions about how to operate and maintain your heating and cooling systems. This can result in improved energy efficiency and cost savings, as well as lower environmental impact.

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