Daikin HRV System

Comments:

Heat recovery ventilation is a ventilation system that employs a counter-flow heat exchanger between the inbound and outbound air flow. The Daikin HRV (Heat Recovery and Ventilation) system provide fresh air and improved climate control, while also saving energy by reducing the heating (or cooling) requirements.

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Background:

Heat recovery ventilators (HRV’s), as the name implies, recover the heat energy in the exhaust air, and transfer it to fresh air as it enters the building.

Benefits:

As building efficiency is improved with insulation and weather-stripping, buildings are intentionally made more air-tight, and consequentially less well ventilated. Since all buildings require a source of fresh air, the need for HRVs has become obvious. While opening a window does provide ventilation, the building's heat and humidity will then be lost in the winter and gained in the summer, both of which are undesirable for the indoor climate and for energy efficiency, since the building's HVAC systems must compensate. HRV technology offers an optimal solution: fresh air, better climate control and energy efficiency.

Technology:

HRVs can be stand-alone devices that operate independently, or they can be built-in, or added to existing HVAC systems. For a small building in which nearly every room has an exterior wall, then the HRV device can be small and provide ventilation for a single room. A larger building would require either many small units, or a large central unit. The only requirements for the building are an air supply, either directly from an exterior wall or ducted to one, and an energy supply for air circulation, such as wind energy or electricity for a fan.