Green Building Bible, Fourth Edition |
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These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
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Posted By: RobLYou can't "gain" more heat from a heatpump than there is available "in" the air.
Posted By: WillInAberdeenAs was mentioned previously, the heatpump has an advantage if it cools the outgoing air to much lower than outside ambient temperature, or if there are thermal gains in the building, but that's a bit niche in the UK.Exactly. Considering that the usual limitation with ASHPs in typical UK humid conditions is the effect of icing if the temperature is dropped too far and that the exhaust air from a house is normally expected to contain more water vapour than the outside air it would appear that “super-cooling” [¹] extract air might be a bit silly.
Posted By: WillInAberdeenhttps://www.gov.uk/government/uploads/system/uploads/attachment_data/file/255762/summary_detailed_monitoring_2_flats_exhaust_air_source_heat_pumps.pdf" rel="nofollow" >https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/255762/summary_detailed_monitoring_2_flats_exhaust_air_source_heat_pumps.pdf
A small but detailed study of some social housing with EAHPs to provide both DHW and CH. On rare occasions they performed well (CoP>3) but were mostly a poor fit to the tenants' preferred heating patterns, of heating certain rooms to a high temperature for a few hours of each day. The units also seemed to be undersized for the tenants DHW demands. Possibly a conventional ASHP would also have been a poor fit.
Similar story here
http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6696" rel="nofollow" >http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6696