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Heat exchanger for air

Calculates the efficiency of a heat exchanger.

Heat exchanger for air

Input Result
Supply air Värmeväxlare
Extract air
Outdoor air
Exhaust air
Efficiency % %


The schematic image is for a cross-flow heat exchanger, but the calculations also work on other types of heat exchangers.

Outdoor air

The air temperature entering the heat exchanger is usually the same as the design of the outdoor air temperature.

Extract air

The temperature of the air that leaves the room and enters the heat exchanger.

Supply air

The temperature of the air going into the room.

Exhaust air

The term for the air that has passed the heat exchanger and is on its way out into the outside.


The efficiency of the current heat exchanger will vary depending on the type of shifting is selected. Some common types of heat exchangers are listed below.

Rotary Heat Exchanger

Rotary Heat Exchanger which briefly is a rotating wheel as air passes through while exhaust heat is transferred to the supply air this type of heat exchanger typically have an efficiency of 80-85%

Plate Heat Exchanger

Plate heat exchanger recovers heat through the heat exchanger where the supply and exhaust air is never in contact with each other the most common types of plate heat exchangers are:
- Plate heat exchanger typically have an efficiency of 50-60%.
- Counterflow heat exchanger typically have an efficiency of around 90% recovery rate.

Liquid connected heat recovery

Liquid connected heat recovery consists of a heating coil in the respective air and are connected to each other via pipes. The efficiency of liquid connected recovery is normally between 50-60%.


Efficiency: Efficiency