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Heat Recovery Ventilation (HRV)

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How a Heat Recovery Ventilator (HRV) Works

Modern houses are generally sealed and the air is laden with moisture and pollutants created from the daily activities of its occupants. The installation of an air exchanger inside the house will remove stale and polluted air from the house to the outside and replace it by an equivalence of fresh air. Generally, an air exchanger system installed properly will renew the air of all the important parts of the house. How does this happen?

Through a ductwork system installed in the walls; those ducts ending with fresh air distribution grilles and stale air exhaust grilles. Fresh air distribution grilles are located in each room of the house needing fresh air (which are, among others, bedrooms, kitchen and living room).

The stale air to outside grilles are generally located at the highest level of the house, where the excess humidity and pollutants build-up. The fresh air distribution and stale air exhaust ducts are connected to the air exchanger.

Two other ducts are also connected to the unit: one for gathering fresh air from outside and the other one to exhaust the stale air to outside. The heat recovery ventilator manages the exchange of air throughout the whole house.

diagram-heat-recovery@2x

What Heat Recovery Ventilation (HRV) is used for

Ventilation through open windows is not always ideal, especially during the colder months when you are trying to keep your premises warm. The use of an energy efficient heat recovery ventilator will help to maintain a fresh ambiance and help to recover up to 90% of the warmth created inside. With an ever increasing demand for building air tightness for improved energy efficiency, effective ventilation is also necessary for improving indoor air quality and the protection of building structures from fungal growth.

The ventilation system helps to reduce the impact of humidity and the accumulation of pollutants by exchanging inside air with fresh air from outside. During the heating season, heat is transferred from the warm indoor exhaust air into the cold outdoor supply air inside the HRV heat exchanger. The HRV heat exchanger not only transfers this heat, but transfers some of the moisture in the more humid exhaust air into the less humid supply air. This heat/energy transfer means that your home heating system uses less when compared to any other form of ventilation.

During the cooling seasons the process depends whether or not you are exhausting air conditioned air. If you are not air conditioning the indoor air, ventilation is generally accomplished by opening windows and turning off the air exchanger. If you are air conditioning the indoor air, heat is transferred from the warm/hot outdoor supply air into the cool indoor exhaust air inside the heat exchanger, thus reducing the temperature of the fresh air coming in.

The heat exchanger not only transfers this heat but transfers some of the moisture in the more humid supply air into the less humid exhaust air, thus reducing the humidity of the fresh air coming in. This heat/energy transfer means that your house cooling system uses less energy when compared to any other form of ventilation. This transfer of heat or energy is accomplished with very little or no mixing of the 2 air streams, meaning the pollutants are exhausted and the heat/energy is recovered.

Benefits

  • The efficient design provides optimal indoor air quality
  • Up to 90% heat recovery.
  • Quiet operation 19-29 dBA
  • Energy saving
  • Eliminates excess moisture
  • Compact in design the twin function works by reversing the operation every 70 seconds to provide fresh outdoor air whilst extracting indoor stale air.

Call Homevent to see how our Heat Recovery Ventilator product can provide you with a clean, fresh, efficient air supply to your home.