- 26 Aug 2016
- Reaction score
That's very interesting, given the increase in heat pumps trying to get energy from the outside air at 5c at 80% humidity. You'd have thought a stream of flue gas at 50c and 100% humidity would be an attractive target for a heat pump.Ideally the flow would be as far below the dewpoint temperature as possible, not the return. That's why I emphasize the flue temperature not the return or flow; the flue temperature is the giveaway on how successful cooling of the flue gases has been or put another way, how good the heat exchanger is, something people seem to overlook.
I wonder how long before boilers start having flue gas heat recovery based on a heat pump and boilers really do become "more than 100% efficient." In terms of energy in Vs heat into the circuit.