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Posted By: jonny-b-the floor area of the house is 2380sqft
Posted By: jonny-b-Not too sure how to do the calculations really.
Posted By: Viking HouseHi Jonny, Your house is 220m2 floor area x 2.5m ceiling height = 550m3 volume.550m3 x 0.3 airchanges/hr is 165m3/hr.Also calculate the occupants and choose the largest figure, so 25m3 per person x 4 persons = 100m3.So you would choose a unit that can handle 165m3/hr.
Posted By: Viking House8,000 HRV units were sold in the UK
Posted By: Viking House2,000 filters were sold
Posted By: Viking HouseThese are just 3 of the reasons we moved away from Ducted HRV systems but my opinion is biased
Posted By: PaulJI agree that running MVHR all year seems a bit silly, as the HR is probably good for 5 months in England (SE). Wouldn't it be better to trickle vent intake with MVHR boost extract in the summer and use full MVHR the rest of the time?
Posted By: djh The latest GBM has an article about the pros & cons of turning MVHR off and on.
Posted By: Viking HouseIn 2010 18,000 HRV units were sold in the UK, in 2011 (a year later) only 2,000 filters were sold!
Posted By: jms452 Our MVHR has a 5 year filter life with a suggested yearly vacuum clean, and then there are the washable filters and the fact that MVHR sales are probably ramping up fairly steeply...
Posted By: jms452Without filters efficiency will rapidly degrade - this must be true of the fiwi too?
Posted By: jms452And even if people are stretching out the filter life it shouldn't effect heat exchanger efficiency (negatively) - it just means they are then working slightly below building regs air flows which some people here seem to advocate anyway...
Posted By: Viking HouseWhy do you think efficiency degrades without filters? I'd say efficiency degrades with filters!
It affects the Watt/litre/sec figure.
Posted By: chriskempMVHR needs to run 24/7 to comply with building regulations - especially in buildings <3m3 airtightness.
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