Poistoilmalämpöpumpun

Poistoilmalämpöpumppu, often abbreviated as PELP, is a type of heat pump commonly used in Nordic countries, particularly Finland, for both heating and ventilation in residential buildings. Its primary function is to recover heat from the exhaust air of a building. This recovered heat is then used to heat the incoming fresh air, thus reducing the energy needed to heat the building and pre-heating domestic hot water.

The operation of a poistoilmalämpöpumppu involves extracting stale indoor air and passing it through a heat exchanger. This heat exchanger transfers thermal energy from the exhaust air to a refrigerant. The warmed refrigerant then circulates to a compressor, which increases its temperature and pressure. This high-temperature refrigerant then transfers its heat to the building's heating system, typically a water-based radiator or underfloor heating system, and also to the domestic hot water tank. After releasing its heat, the refrigerant cools and is pumped back to the exhaust air heat exchanger to repeat the cycle.

Poistoilmalämpöpumput offer several advantages, including energy savings and improved indoor air quality. By utilizing the heat from outgoing air, they significantly reduce the demand on primary heating sources like electricity or oil. They also contribute to a more controlled ventilation process, ensuring a constant supply of fresh, pre-heated air while expelling moisture and pollutants. However, their effectiveness can be influenced by outdoor temperature and the building's insulation levels. Maintenance, including cleaning of filters and heat exchangers, is essential for optimal performance.