The Heat Reclaim Ventilator (HRV) is used to introduce outside air into a conditioned space while reducing the heat load on the system, providing heating and cooling. The Daikin HRV systems are up to 84% efficient in temperature exchange efficiency. They also exchange the enthalpy of the air being processed (transfer of moisture) and are up to 77% efficient in heating and 70% efficient in cooling.
This type of system is a must in passive homes, where the air leakage of the house is very minimal, causing problems with moisture. It’s also a good option to have in any home providing air changes. The HRV draws air in from outside and exhaust air from inside.
The exhausted and outside air both pass each other in the heat exchanger, and this is where the heat energy is exchanged from the outgoing and to the incoming air. The enthalpy of the air is exchanged as well. The HRV can be set up on its own controller or piggyback onto the Daikin air conditioning controller and work in conjunction with the air conditioning system.
There is also an option to connect the system to a CO2 sensor that varies the amount of air required to meet the CO2 set point. There is also a bypass option that can ventilate the house and provide cooling at night when the air outside is cooler than inside. The exhausted air could be drawn from the bathroom toilets etc and delivered back into the supply air from the air conditioning system.
The HRV systems are designed to be run for extended periods, providing a small amount of air flow over a long period of time. A boost option can be wired in that sets the system to full speed when the bathroom is in use, then dropping back to low speed.
