# What is delta T (ΔT)? Graham Hendra explains what the mysterious delta T (ΔT) is when it comes to heat pump systems.

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Delta T, also known as temperature difference or temperature gradient, is the difference in temperature between two points. It is commonly used in the field of thermodynamics to describe the difference in temperature between the heat source and the heat sink in a heat pump or other heating or cooling system.

For example, in a heat pump, the delta T is the difference in temperature between the heat source (e.g. the ground or the air) and the heat sink (e.g. the indoor air). The larger the delta T, the more efficient the heat pump will be, as it will be able to transfer more heat from the heat source to the heat sink.

Delta T is typically expressed in units of temperature, such as degrees Celsius or degrees Fahrenheit. It is calculated by subtracting the temperature of the heat sink from the temperature of the heat source. For example, if the temperature of the heat source is 20C and the temperature of the heat sink is 10C, the delta T would be 10 degrees Celsius.

Overall, delta T is an important concept in the field of thermodynamics, as it describes the difference in temperature between two points and can be used to determine the efficiency of a heating or cooling system.

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