Why is it used?
MVHR is a balanced ventilation system, extracting and supplying equal levels of air around the dwelling, providing a controlled system for the building. As ventilation now has more impact on heat loss from buildings, energy savings from motor consumption and air tightness are driving the design and installation of new technologies. MVHR is just one of the more efficient methods that is favoured in SAP and can help reduce DER’s (dwelling emissions rates) in a cost effective way.
www.sap-appendixq.org.uk for more information.
How Mechanical Ventilation with Heat Recovery works
With tighter new buildings, whole house heat recovery ventilation is the most effective ventilation strategy to satisfy Document F requirements and improve SAP ratings under Document L. Mechanical Ventilation with Heat Recovery (MVHR) continuously extracts humid air from wet areas such as kitchens and bathrooms and using an Xcell heat exchanger, transfers the heat to filtered incoming outside air which is redistributed to the living areas and bedrooms. Xcell heat exchangers are up to 93% efficient which significantly help reduce heating bills, plus the effects of condensation are dramatically reduced.
Ventilation and Fresh Air
Ventilation is important to ensure a healthy environment inside all buildings and can be achieved in a variety of ways from simply opening a window to a complex bespoke system designed for a specific building. Without ventilation a building becomes uncomfortable for the occupiers and often there can be problems with sick building syndrome from increased CO2 levels whichcan affect the concentration levels of the users.
Efficient ventilation can be used for the cooling of a building in the summer months through the effective use of night purging of the heat. This technique can result in a reduction in the use of air conditioning or its complete removal therefore reducing energy consumption. Each ventilation system must be designed to suit the needs of the building and the users and there are many factors that must be considered before selecting the appropriate system such as:
- Internal heat gains
- Building orientation & glazing ratio
- Heavy / Light mass construction
- Building depth - façade to façade
- Occupancy / activities
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