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MVHR

MVHR. Mechanical ventilation heat recovery system. How it works. Used in passive houses to provide a continuous controlled supply of fresh air. Moist warm air is extracted from the kitchen, bathroom and utility rooms.

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MVHR

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  1. MVHR Mechanical ventilation heat recovery system.

  2. How it works Used in passive houses to provide a continuous controlled supply of fresh air. Moist warm air is extracted from the kitchen, bathroom and utility rooms. The heat in this air is transferred to the cool fresh air drawn in from outside. This warm fresh air is supplied to the living room and bedroom

  3. How it works The extracted air and supply air do not mix. Instead they pass either side of a heat exchange plates that allow the transfer of heat energy. The fresh air is filtered as it enters the house for pollen and dust. This provides better air quality that simply opening a window. The MHRV should be placed down stairs to allow easy changing of filters. (utility room)

  4. Cold Weather During cold weather a post heating element is used to raise the temperature of the incoming air to ensure a constant comfortable temperature of 20 degrees is maintained in the home at all times. During warm weather a summer bypass is used to prevent over heating.

  5. Sound Proofing A sound attenuator is used to ensure that noise does not transfer from one space to another. This is particularly important for bedrooms.

  6. Performance criteria The design of the system must be balanced for the entire dwelling to ensure that a minimum air change rate of 0.3 changes per hour is achieved. Also 30m2/hour/person of fresh air must be supplied.

  7. Pros and Cons Advantages Disadvantages Eliminates the need to completely heat the fresh air coming into the house Cut down on heating cost and allows a more air tight building. Lowers your carbon footprint Filters must be changes regularly Dependant on electricity to continue working.

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