Dear forum members,
I have been reading through the posts here for a few days and feel like my head is about to explode 😉 This is really very informative, and I’m very glad I came across this before signing anything! However, I have the impression that there might be no solution for our "problem."
A brief introduction: We have reserved a plot of land and have more or less finalized our choice of a builder who will construct a 1.5-story solid single-family house that can accommodate six people. We opted for gas heating, but with underfloor heating and good insulation to possibly switch to a heat pump as a heat source in the future. The initial offer included a ground-source heat pump plus a controlled ventilation system with exhaust air heat recovery connected to the brine circuit and decentralized supply air. We would very much like to install a ventilation system, preferably one with central exhaust and decentralized supply air when it comes to hygiene and maintenance effort. But it seems that recovering heat from exhaust air to domestic hot water is only possible with an exhaust air heat pump, right? That is probably extremely expensive and also not practical, is it? I would greatly appreciate any tips on how you have solved this issue, for example!
Good luck, Mecc
I have been reading through the posts here for a few days and feel like my head is about to explode 😉 This is really very informative, and I’m very glad I came across this before signing anything! However, I have the impression that there might be no solution for our "problem."
A brief introduction: We have reserved a plot of land and have more or less finalized our choice of a builder who will construct a 1.5-story solid single-family house that can accommodate six people. We opted for gas heating, but with underfloor heating and good insulation to possibly switch to a heat pump as a heat source in the future. The initial offer included a ground-source heat pump plus a controlled ventilation system with exhaust air heat recovery connected to the brine circuit and decentralized supply air. We would very much like to install a ventilation system, preferably one with central exhaust and decentralized supply air when it comes to hygiene and maintenance effort. But it seems that recovering heat from exhaust air to domestic hot water is only possible with an exhaust air heat pump, right? That is probably extremely expensive and also not practical, is it? I would greatly appreciate any tips on how you have solved this issue, for example!
Good luck, Mecc
Hello,
Heat recovery from the exhaust air benefits the central supply air. For example, at an outdoor temperature of -14°C (7°F), the supply air temperature could be around 12°C (54°F). This is much more comfortable than the low supply air temperatures you get with decentralized supply air.
If you choose controlled ventilation with heat recovery, then do it properly. Most people only build once, so half-truths don’t make much sense.
Best regards
Mecc schrieb:Not a bad decision for the future.
..... We have decided on gas, but with underfloor heating and good insulation to possibly switch to a heat pump as a heat source later on.
Mecc schrieb:That is actually the standard and most common setup. Why shouldn’t it work here?
..... one with central exhaust and decentralized supply air.
Mecc schrieb:Why insist on preparing hot water with an additional exhaust air heat pump when a gas condensing boiler is planned? Separating heat generation for heating and domestic hot water is usually only necessary in exceptional cases. For a typical single-family home, one heat generator serving both areas is usually sufficient.
..... But heat recovery from the exhaust air to the domestic hot water seems only possible with an exhaust air heat pump, right?
Heat recovery from the exhaust air benefits the central supply air. For example, at an outdoor temperature of -14°C (7°F), the supply air temperature could be around 12°C (54°F). This is much more comfortable than the low supply air temperatures you get with decentralized supply air.
If you choose controlled ventilation with heat recovery, then do it properly. Most people only build once, so half-truths don’t make much sense.
Best regards
Hello €uro,
thank you very much for your reply! The idea of domestic hot water heating came up because with decentralized supply air, the heat cannot be transferred to the supply air. And the heat has to go somewhere—simply venting it into the atmosphere seems like a waste. But you mean that if controlled residential ventilation is used, it should be done properly. So, also central supply air? We are just concerned about the maintenance costs of a central system, and apparently, a lot can go wrong with calculation errors, missing silencers, and so on. Our builder also warns about the hygienic disadvantages of the central version due to different temperatures of walls, ducts, and air, which could lead to condensation. Sounds like a good breeding ground...
Good luck, Mecc
thank you very much for your reply! The idea of domestic hot water heating came up because with decentralized supply air, the heat cannot be transferred to the supply air. And the heat has to go somewhere—simply venting it into the atmosphere seems like a waste. But you mean that if controlled residential ventilation is used, it should be done properly. So, also central supply air? We are just concerned about the maintenance costs of a central system, and apparently, a lot can go wrong with calculation errors, missing silencers, and so on. Our builder also warns about the hygienic disadvantages of the central version due to different temperatures of walls, ducts, and air, which could lead to condensation. Sounds like a good breeding ground...
Good luck, Mecc
Hello,
Best regards
Mecc schrieb:Well, every general contractor has their own concept that they want to promote. Deviations from this are usually not welcomed ;-) Accordingly, the evaluation of alternative options tends to be negative as well ;-)
...We only have concerns about the maintenance costs of a central system, and apparently so many things can go wrong with miscalculations, missing silencers, and so on. Our building supervisor also warns about the hygienic disadvantages of the central version due to different temperatures of the wall, pipe, and air, which could lead to condensation. That sounds like a good breeding ground...
Best regards
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