page_title: Heat recovery ventilation
section_title: Working principle
hierarchical_section_title: Heat recovery ventilation / Working principle
caption_attribution_description: English: Ventilation unit with heat pump and ground plate heat exchanger (cooling)
context_page_description: Heat recovery ventilation, also known as mechanical ventilation heat recovery, is an energy recovery ventilation system which works between two sources at different temperatures. Heat recovery is a method which is increasingly used to reduce the heating and cooling demands of buildings. By recovering the residual heat in the exhaust gas, the fresh air introduced into the air conditioning system is pre-heated, and the fresh air enthalpy is increased before the fresh air enters the room or the air cooler of the air conditioning unit performs heat and moisture treatment. A typical heat recovery system in buildings consists of a core unit, channels for fresh air and exhaust air, and blower fans. Building exhaust air is used as either a heat source or heat sink depending on the climate conditions, time of year and requirements of the building. Heat recovery systems typically recover about 60–95% of the heat in exhaust air and have significantly improved the energy efficiency of buildings.
context_section_description: A heat recovery system is designed to supply conditioned air to the occupied space to continue the desired level of comfort. The heat recovery system keeps the house fully ventilated by recovering the heat which is coming from the inside environment. Heat recovery systems basically work by transferring the thermal energy (enthalpy) from one fluid to another fluid, from one fluid to a solid or from a solid surface to a fluid, at different temperatures and in thermal contact. Additionally, there is no direct interaction between fluid and fluid or fluid and solid in most of the heat recovery systems. In some application of heat recovery systems, fluid leakage is observed due to pressure differences which can cause mixture of the two fluids.
caption: Ventilation unit with heat pump & ground heat exchanger - cooling
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