Heat recovery ventilation enables the exchange of air in rooms without the risk of contamination and odors penetrating into the supply air. The main task of the heat recovery ventilation system is to provide the house with fresh, filtered air heated by the exhaust air and remove (extract) stale, "polluted" air.
Energy recovery units are not only characterized by heat recovery function, thanks to the advanced technology of the enthalpy (counterflow) exchanger they recover heat and moisture from the air.
The spacing between the cellulose fibers allows free passage of water vapour molecules. Thus, larger molecules, like those of odours, cannot pass through the heat exchanger. This prevents the contamination of the fresh air supplied indoors. Moreover, the energy efficiency of heat recovery units reaches (depending on the model) from 250 to 1000 m3/h.
Instead of a standard heat exchanger, an enthalpy exchanger is used, which transforms the unit into an Energy Recovery Ventilation (ERV) system, as opposed to a standard Heat Recovery Ventilation (HRV) system. Meaning both thermal and latent energy from the stale air is extracted from wet rooms.
An enthalpy exchanger is an air-to-air heat exchanger that additionally transfers moisture from one stream to another. The so-called latent energy, which reduces the energy demand for air conditioning.
Energy recovery ventilators are recommended for cold and warm climates. In moderate climates, the client can choose between heat and enthalpy exchangers, taking into account its advantages. At the design stage, it is difficult to determine whether there will be a problem with too dry air, often the decision to buy an enthalpy exchanger is made after 1-2 years of using the heat recovery system.
Advantages of an energy recovery ventilator
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The heat exchanger is made from plastic and processed cellulose which has a high water vapour permeability ratio, good airtightness, and good resistance to ageing.
The spacing between the cellulose fibres allows free passage of water vapour molecules. Larger molecules, like those of odours, cannot pass through the heat exchanger.
This prevents the contamination of the fresh air supplied indoors. The heat recovery ventilators are available in an output range from 250 m3/h to 1000 m3/h.
A standard HRU-ERGO energy recovery ventilator features 10-speed energy-efficient fans, automatic air bypass, defrosting mode (based on a fan speed control algorithm), 2 air filters, and steel duct connections.
|Heat and energy recovery ventilators with enthalpy|
Its modern design will seamlessly match every energy-efficient
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The spacing between the cellulose fibres in the material allows
|Counter-flow heat exchanger for heat recovery ventilators|
A preliminary heater (preheater) is installed on the exhaust duct of HRU (fresh air from outside) and it is used to preheat the air supplied to the heat recovery unit.
The preliminary heater is fitted to prevent freezing of the heat exchanger at extremely low outside temperatures and it does not affect the temperature in the room. The standard HRU-ERGO unit has an automatic frost protection function, which protects from freezing by periodic altering of fans’ speed.
It is recommended to use a heater with one contactor type HDE-CO1 or with two contactors type HDE-C02. A secondary heater is installed on the supply air duct (fresh supply air to the room) and it is used for additional heating of the supply air temperature. After connecting the heater to the HRU-ERGO unit we are able to task the temperature in the room when we feel that thermal recovery alone is not enough for our comfort. We recommend a duct heater HDE-CO2 with two contactors.
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