Exhaust air heat pump

OptiSun exhaust air heat pump

OptiSun Exhaust Air Heat Pump (EAHP) is a unit optimized for the OptiSun system and with it you can recover the heat energy of a block house property and store it to the OptiSun hot water boiler.

The type of the OptiSun exhaust air heat pump will be selected for the structure of the target property’s ventilation system. If your block house property has exhaust ventilation and exhaust air fans are in good shape, there is no need to renew them. In that case we add evaporators to the exhaust air fans, and they work as a Heat Recovery Unit (HRU) and will be connected for example to the heat pump in the heat distribution room located in the basement.

If your block house property has gravitational ventilation, you can install a ready exhaust air heat pump unit with the exhaust air fans on the roof. In addition to heat recovering, the modern mechanical ventilation to improve the ventilation of the rooms, will also be achieved.

The structure of the OptiSun exhaust air heat pump

Like the other heat pumps, the main parts of the OptiSun exhaust air heat pump are a condenser (1), an expansion valve (2), an evaporator (3) and a compressor (4).

The evaporator works as a heat recovery unit. It collects heat from the exhaust air flow to the heat transfer fluid which will be transferred to the OptiSun hot water boiler with the heat pump’s condenser.

The function of the OptiSun exhaust air heat pump

The exhaust air fans are continually working. And daily, usually in the morning and in the evening about two hours at a time, they are working intensified. This exhaust air flow will be led out of the house through the ventilation ducts and the evaporator, which works as a heat recovery unit.

The evaporator collects heat from the exhaust air flow to the heat transfer fluid. The evaporator gets cold because the refrigerant state has been changed from high pressure fluid to partly vaporized low pressure fluid with the expansion valve before it.

In the evaporator warmed up refrigerant changes to low pressure vapor which is soaked up to the compressor. The compressor increases the pressure of the refrigerant vapor when it gets warm and flows to the condenser.

The condenser releases its heat to the OptiSun hot water boiler, the refrigerant condenses and changes to high pressure fluid, and the cycle of the heat pump starts again.

If there is enough sun heat available, the heat pump will be stopped to save electrical energy and extend the age of the heat pump.

The installation and connection of the OptiSun exhaust air heat pump to the property’s heating system

The OptiSun exhaust air heat pump will be connected to the OptiSun hot water boiler according to the publication”K1 Rakennusten kaukolämmitys, Määräykset ja ohjeet” which is part of the building regulation collection, and local district heating supplier’s requirements.