Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

DCMV v MVHR

  • 22-09-2011 8:08pm
    #1
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭


    I'm not particularly biased towards the use of either, just fascinated to know the experiences of people who have installed DCMV?

    New Regs are finally addressing air-tightness, some would say our Regs are not going far enough, considering how far we've come with insulation.. I've just had a read of the new US codes (following a read of the greenbuilding advisor article) and they seem to be a small bit ahead of us in Ireland. But it's becoming clear that with increased air-tightness there are questions and decisions to be made regarding how we supply adequate fresh air to our new and retro-fitted homes. I'm presuming the goal is still to reduce Co2 emissions, although its easy to get lost with technology and the cost of course..



    PHPP insists on MVHR, and I for one do see the merit in its use. But then there's occupant behaviour, maintenance, initial product cost and electrical running costs to consider. There are also the irrational fears associated with units not working and the odd horror story that's pre-empted new codes of practice and safety features - But such fears can be applied to anything new, just like electricity less than 50 years ago. Now that's all mentioned, is there any alternative?


    Is Demand controlled Mechanical ventilation an alternative to MVHR, when the overall running costs + initial set-up costs and less maintenance are considered? With DCMV's reduced electrical and primary energy consumption, is there some merit to this? It also has the bonus of having some of its kit already familiar to users as its includes direct extract fans at the usual kitchen & wc locations.


    Some are calling DCMV a natural/passive alternative to MVHR systems which it imo is not. Although I hope we might get to an easy to design/install Bedzed type solution someday. It should also be noted that imho neither system should installed unless an air-tightness level of say 3m3/(h.m2)@50Pa is achieved.

    So, any home-owners/ designers any experience of DCMV? lets leave the actual units names to PM but experiences here. thanks


Advertisement