4 ms·
There are units which exchange heat with water, but typically they won't reach more than 40-45 C°, maybe 50, I doubt 55, so radiators heating won't work, you ne
by jaclaz 4y ago
There are units which exchange heat with water, but typically they won't reach more than 40-45 C°, maybe 50, I doubt 55, so radiators heating won't work, you need fan-coils or - better - under floor heating.
Additionally (it depends) usually pipes used in traditional radiator heating system are smaller in section (when compared to those used in fan-coil heating/refreshing) so your existing pipes may be too small to allow the system to work efficiently.
Personally I am not impressed by them, if not in direct small (split) systems, the exchange to water seems like losing a lot of energy.
But the good thing is that they allow, in reverse, to cool the house in the warm months (though not comparable to a traditional A/C system).
The 10 years duration sounds like what you can expect (to be compared to a traditional burner that would cost less than half a heat pump and is more in the 20+ years duration).
There is also the issue that (at least in my experience) they are "slow" when compared to a gas/kerosene/oil burner, so you need to keep the house somewhat heated at all times as it takes more time to raise temperature[1].
[1] there is a lot of debate around whether it is more efficient (with traditional fuel burners) to switch heating off when you are not in the house (potentially letting the temperature go down to - say - 8-10 C°) and boost to the wanted temperature when you are in or keep at all times the house warm (at - say - 13-15 C°) and only increase the temperature to 18-20 C° when you are in
- 2Gkashmiri 4y agowhat if we use, as you said, FCUs instead of a traditional radiator? i understand other commenters are talking about individual air conditioning but that increases the electrical load exponentially because you have multiple units running at the same time... think of the poor wires. has anyone been crazy enough to preheat the heatpump from solar ? would that even work?
- jaclaz 4y agoAs said, very likely the pipes you have (dimensioned for radiators) are too small for fan-coils. There is not much issue with several units, the problem was with electric motors starting (old motors can have something like 5 times normal current peaks when starting) modern motors all have electronics that smooth them down. You mean: https://en.wikipedia.org/wiki/Solar-assisted_heat_pump https://en.wikipedia.org/wiki/Solar-assisted_heat_pump
- 2Gkashmiri 4y agonot these... they aren't available in india :-( i mean air to water source heat pump that would get inputs from a standalone solar water heater..... solar water heater>heat pump>??? profit https://www.racold.com/heat-pump-water-heaters/domestic https://www.racold.com/heat-pump-water-heaters/domestic 150Litre one basic model costs INR 122,000 or US $ 1452. https://www.racold.com/solar-water-heaters/alpha-pro https://www.racold.com/solar-water-heaters/alpha-pro the basic 100 Litre one costs inr 24000 or us$ 285. this is retail prices while government subsidy is like in 10,000 or US$119. you can see the idea,
- ZeroGravitas 4y agoMixergy does a water tank that can accept input from multiple heat sources including solar thermal and solar PV and heat pumps. Not sure how widely available it is though. https://www.mixergy.co.uk/products/solar-tank/ https://www.mixergy.co.uk/products/solar-tank/
- te0006 4y ago>There are units which exchange heat with water, but typically they won't reach more than 40-45 C°, maybe 50, I doubt 55, so radiators That's what two heating "experts" told me in Spring 2021 when my gas furnace for central heating needed to be replaced and I asked them wether it would be possible to just replace it with an electric heat pump. "Impossible", they said, your house is not insulated strongly enough and you don't have floor heating, so the outgoing temp will not suffice". It's not true. There are many heat pumps on the market now, and have been since 2020, which manage to deliver 55°C without problem, amongst them, self-contained "monobloc" devices[1] - a box mounted at the outside of the house, which only needs cables and two pipes for connecting to the central heating circulation. With COP values of 3-4 depending on outside temp and outgoing heating water temp. Look at your actual outgoing temp settings (or "heating curve") on the gas furnace. If you never need >55°C, or only need such a temperature on three extremely cold days each year, then a heat pump might be a good idea. Except you can't buy them right now, at least in parts of Europe, for reasons that need not be repeated here. [1] e.g. this one, which even delivers 60°C: https://www.daikin.eu/en_us/product-group/air-to-water-heat-pump-low-temperature/daikin-altherma-3-m.html https://www.daikin.eu/en_us/product-group/air-to-water-heat-...
- jaclaz 4y agoSure, everything is possible, in theory, in practice it has to be seen specifically. As said typically heat pumps work around 45-50 °, those that can reach higher temperature do exist, but are not common. There is a rather nice paper (by Caleffi which produces mostly valves) that is a good intro to the conversion from burner boilers to heat pumps or other lower temperature heating systems: https://www.caleffi.com/sites/default/files/file/idronics_25_na.pdf https://www.caleffi.com/sites/default/files/file/idronics_25...