The most common type of heat recovery used for ventilation systems, is the plate heat exchanger. Energy is transferred from one air stream to another with no cross contamination. In areas where the input and extract systems are remote from each other, a run-around coil system can be used to overcome practical installation issues.
VRV/VRF systems can provide cooling and heating for large offices and less complex areas, with multiple ceiling mounted cassette or ceiling concealed fan units for each single external condensing unit. But still need a fresh air system to provide the minimum tempered fresh air for the occupancy of the area.
Heat recovery enables a system to recover up to approximately 50% of the energy from the extract airstream of a ventilation system. As environmental issues become increasingly influential in the design of mechanical ventilation systems, the inclusion of a heat recovery facility can contribute to considerable energy savings, and the reduction of related carbon emissions.