Heat Recovery Heat Pump

Heat Recovery Based on Exhaust Air

Ventilation, which means totally hygienic inside air, is a basic requirement for living in a healthy house. Controlled domestic ventilation with heat recovery reuses the energy from the exhaust air. Not only that, the additional heat generated internally from lighting, people and domestic appliances is also utilised through heat recovery.

Fresh outside air is supplied to the house through cleanable outside vent holes. The air overflow occurs under the door or through the overflow vent holes. The warm inside air (exhaust air) is drawn into the ventilation system. Warm exhaust air is supplied to the heat pump for heat recovery. When the inside air has passed through the heat pump the discharge air is released into the open air. Before this, the heat pump has extracted sufficient energy from the exhaust air to produce hot water.

Function of the cooling circuit

• The indoor air passes the evaporator at room temperature. Energy is emitted here. The indoor air is then released.
• Another fluid circulates in the heat pump in a closed system with the most important characteristic of having a low boiling point. This fluid is called a refrigerant. When the refrigerant reaches the evaporator, which has received energy from the room air, the refrigerant evaporates.
• The vapour is fed to a compressor where it is compressed. This results in a high increase in temperature.
• The warm refrigerant is fed to the condenser, which is positioned in the boiler water. Here the refrigerant gives off its energy to the boiler water, so that its temperature drops and the refrigerant changes state from gas to liquid.
• The refrigerant then goes via filters to an expansion valve, where the pressure and temperature are further reduced.
• The refrigerant has now completed its circuit and is once more fed into the evaporator where it is evaporated yet again due to the effect of the energy that the collector has carried from the energy source.