HRV stands for Heat Recovery Ventilation and it was developed in order to recover the heat or energy contained in exhaust air.
HRV supplies fresh new air flow as well as enhanced climate control as well as saving energy by simply minimizing the heating (or cooling) demands.
ERV stands for Energy Recovery Ventilators and is employing similar mechanicsand transfers the actual moisture degree of the exhaust air to the intake air.
HRV should be employed if a person uses the heating system in their house more often than the cooling and air conditioning system and ERV should be used when the exact opposite happens.
The need for HRV /ERV was created because of enhanced building efficiency with insulation and weatherstripping.
Nowdays, buildings are generally created much more air-tight, and as a result lesser ventilated and considering that just about all structures need a supply of fresh air, the actual demand for HRVs has come to be apparent.
Even though opening a window can produce air flow, the building's heat and moisture will then be lost in the winter as well as gained in the summer, both of which are undesired for any indoor environment and also for energy efficiency, because the building's Heating and air conditioning systems need to make up for it.
HRV technologies provide the ideal answer: fresh air, greater climate control as well as Energy efficiency.
Heat recovery ventilation-HRVs and ERVs may be stand-alone units that function separately, or they could often be built-in, or even added in to already present HVAC systems. For a smaller building in which almost each and every room has an exterior wall, then the actual HRV/ERV unit could be smaller and supply air flow for a single room.
A much larger building might demand either numerous small-scale devices, or even a good sized central unit. The only requirements for the building tend to be an air supply, either directly through an exterior wall or ducted to one, as well as an energy supply for air flow, such as wind energy or electricity for a fan. Whenever employed with 'central' HVAC systems, then the system would end up being of the 'forced-air' form.