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	RE: Do I add Air Con or MVHR to existing A2W ASHP? By JamesPa, 4 hours ago Forum Air-to-Air Heat Pumps & Air Conditioning
	Nought for nought is the very best you can do, as soon as you try to get anything at all you get less because entropy continually increases. This is sometimes parodied as You can't win you can only b...
	RE: Do I add Air Con or MVHR to existing A2W ASHP? By Toodles, 4 hours ago Forum Air-to-Air Heat Pumps & Air Conditioning
	@bobflux It just go to show, ‘You get nought for nought’ when it comes to physics. 😉 Regards, Toodles.
	RE: Do I add Air Con or MVHR to existing A2W ASHP? By bobflux, 5 hours ago Forum Air-to-Air Heat Pumps & Air Conditioning
	Dehumidifying is a side effect of cooling the air, so pretty much all air conditioning units are also dehumidifiers... It blows air over the evaporator fins, and if the fins are below the dew point, h...
	RE: Is the "divide by 2900" rule still valid? By JamesPa, 5 hours ago Forum Air Source Heat Pumps (ASHPs)
	Really flow rate is a pipework limitation not a water pump limitation, you can always fit a pump with a greater head or a supplementary pump, but there is only so much flow you can get through a pipe ...
	RE: Is the "divide by 2900" rule still valid? By AndrewJ, 6 hours ago Forum Air Source Heat Pumps (ASHPs)
	@jamespa Thanks James, very helpful. From the proposal and some email threads I've seen, the installer comes over as pretty competent. Obviously the buffer is a thing at the moment but at least it's...
	RE: Is the "divide by 2900" rule still valid? By JamesPa, 7 hours ago Forum Air Source Heat Pumps (ASHPs)
	There is a thread on openenergymonitor which does suggest that the Vaillant Arotherm plus 7kW in particular doesn't deliver the (typically, depending on FT) 8.5kW it claims during defrost, and is more...
	Is the "divide by 2900" rule still valid? By AndrewJ, 7 hours ago Forum Air Source Heat Pumps (ASHPs)
	Brother in law has recently had a survey completed with the heat loss estimated at 9.73kW, a recommended 12kW Arotherm and a flow temp of 50c at -3c for a SCOP of 3.97. There seems to be some suggest...
	RE: Do I add Air Con or MVHR to existing A2W ASHP? By Toodles, 11 hours ago Forum Air-to-Air Heat Pumps & Air Conditioning
	@bobflux Thanks very much for that information and advice; air con is the answer then! I have read that some units incorporate dehumidifiers so must take a closer look at those. Regards, Toodles.
	RE: Do I add Air Con or MVHR to existing A2W ASHP? By bobflux, 12 hours ago Forum Air-to-Air Heat Pumps & Air Conditioning
	About the original question: Flow rate for MVHR is adequate for ventilation, but way too low for air conditioning. Heat capacity of air is only 1200 J/°C/m3, so consider an air conditioner with 2kW co...
	RE: Do I add Air Con or MVHR to existing A2W ASHP? By Toodles, 1 day ago Forum Air-to-Air Heat Pumps & Air Conditioning
	@old_scientist I’m thinking along the lines of a multisplit external unit with 4 internal units. Has anyone any views or experience of the Daikin Perfera range please? After the news this morning that...
	RE: Heat Pump Books For Beginners: The Ultimate Guide to Heat Pumps, Bodge Buster, From Zero To Heat Pump Hero & Britain's Heat Pump Shitshow By Mars, 1 day ago Forum Air Source Heat Pumps (ASHPs)
	Britain’s Heat Pump Shitshow is now available to pre-order on Kindle for just £2.99 and will be released on 7 September. It isn’t an attack on heat pumps. Good systems work brilliantly, and the book g...