ENERGY EFFICIENT HOUSING DEMAND CONTROLLED VENTILATION
Occupation affects ventilation requirements
Specifiers and contractors must put pressure on government to have SAP overhauled
spaces, where access for user-maintenance is restricted. It also noted anecdotal reports that a market for replacement filters does not exist at present, which suggests that even basic maintenance is not being undertaken, possibly because users are not aware of the requirement for it.’ There is also the worry that badly installed and unmaintained mechanical systems may actually increase the risk of health and respiratory problems. The good news for DCV is that under the Government’s flagship Green Deal scheme, which will target energy savings among the UK’s existing housing stock, scheduled for launch in October 2012, it would appear that MHRV systems will not be an approved technology for use in refurbished houses. At the Zero Carbon Hub conference,
300 industry stakeholders heard Stewart Baseley, executive chairman, HBF, call for a model of SAP to be put in place that is fully and properly fit for purpose. He said: ‘Without this, builders are in the invidious
48 CIBSE Journal September 2012
position of having to design buildings that they believe should deliver the performance that is expected but subsequently discover – though no fault of their own – that actual performance is not what is predicted.’ The current state of affairs has left the
not so effective MHRV in pole position, simply because SAP has no methodology to measure DCV performance. This has unfortunately put the technology on the back burner despite its many advantages over MVHR in terms of better indoor air quality, energy efficiency, cost and ease of installation and operation. Specifiers and contractors must put pressure on government to have SAP overhauled so it recognises the technology of DCV, and allows any energy-saving ventilation product to be judged fairly and on its merits.
References 1. Mechanical Ventilation with Heat Recovery in New Homes Interim Report, Ventilation and Indoor Air Quality Task Group January 2012
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