ᐅ Request for Evaluation of Heating and Ventilation Concept for a New Single-Family House
Created on: 31 Dec 2015 19:32
H
holg182
Hello everyone,
We are planning to build a detached single-family house, about 160 sqm (1,722 sq ft), on an 1100 sqm (11,840 sq ft) plot at the edge of town with a slight slope on slate soil. We are aiming for approximately a KfW 70 energy efficiency level, although with the current interest rates we are not relying on the related subsidies. Overall, our planning is going quite well, but when it comes to heating and ventilation, we are unsure if our plan really makes sense. Therefore, we appreciate your opinions on this 🙂
In general, we want to build and operate the house simply and cost-effectively, and it would be great if we could do this with a clear conscience for the environment. Our idea:
- A fairly well-insulated building envelope (see above), without it becoming a bottomless pit.
- Air-to-water heat pump
- Pellet stove in the living room
- Controlled mechanical ventilation (with heat recovery)
- Underfloor heating
The idea is that the air-to-water heat pump supplies most of the heat for the house, and the pellet stove in the living room provides extra support when it gets very cold outside. Ideally, this would happen automatically—so that the pellet stove switches on as soon as the outside temperature drops to a certain value, e.g., -3°C (27°F).
Here are a few questions for you experts:
1. Does this concept make sense as a whole?
2. Or would it be better / simpler / more cost-effective overall to use gas for purchase, operation, and maintenance?
3. Should the pellet stove in our setup be water-bearing (hydronic) or not?
4. Should the controlled mechanical ventilation system include heat recovery, or is that not necessarily required? Does a central or decentralized system make more sense here?
5. How can I find someone who can plan, recommend, offer, and install the right equipment for this setup (and not just the products that provide them with the highest commission)?
Thank you very much for your opinions—and Happy New Year in advance 🙂
We are planning to build a detached single-family house, about 160 sqm (1,722 sq ft), on an 1100 sqm (11,840 sq ft) plot at the edge of town with a slight slope on slate soil. We are aiming for approximately a KfW 70 energy efficiency level, although with the current interest rates we are not relying on the related subsidies. Overall, our planning is going quite well, but when it comes to heating and ventilation, we are unsure if our plan really makes sense. Therefore, we appreciate your opinions on this 🙂
In general, we want to build and operate the house simply and cost-effectively, and it would be great if we could do this with a clear conscience for the environment. Our idea:
- A fairly well-insulated building envelope (see above), without it becoming a bottomless pit.
- Air-to-water heat pump
- Pellet stove in the living room
- Controlled mechanical ventilation (with heat recovery)
- Underfloor heating
The idea is that the air-to-water heat pump supplies most of the heat for the house, and the pellet stove in the living room provides extra support when it gets very cold outside. Ideally, this would happen automatically—so that the pellet stove switches on as soon as the outside temperature drops to a certain value, e.g., -3°C (27°F).
Here are a few questions for you experts:
1. Does this concept make sense as a whole?
2. Or would it be better / simpler / more cost-effective overall to use gas for purchase, operation, and maintenance?
3. Should the pellet stove in our setup be water-bearing (hydronic) or not?
4. Should the controlled mechanical ventilation system include heat recovery, or is that not necessarily required? Does a central or decentralized system make more sense here?
5. How can I find someone who can plan, recommend, offer, and install the right equipment for this setup (and not just the products that provide them with the highest commission)?
Thank you very much for your opinions—and Happy New Year in advance 🙂
There will likely be more photovoltaic systems in the future that are energy self-sufficient during the summer and at the same time supply several neighbors in the low-voltage grid. There will likely be more heat pumps, which means higher energy consumption in winter. There will likely be more electric cars, which naturally consume more energy in winter and may be used significantly less in summer, possibly replaced by bicycles. Overall, winter electricity demand is expected to be noticeably higher than in summer going forward. These are general trends, not absolute rules or black-and-white thinking...
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Sebastian795 Jan 2016 12:55Generally speaking... yes, that’s the right word 🙂
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Peanuts745 Jan 2016 13:16Sebastian79 schrieb:
Since plots are generally getting smaller rather than larger, placing the outdoor unit “somewhere where it doesn’t cause disturbance” is quite a challenge...
Especially the more affordable units can be noisy in winter – even if they meet standards. At my father’s place in the east, on the outskirts of Berlin, many people have installed them on their small houses – it’s awful.In our case, it is located opposite the entrance and also away from the garden and terrace. Sure, you can hear the outdoor unit in winter if a window is open on that side, but otherwise, and in summer, we don’t hear anything. The bedroom is on the opposite side as well.
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Sebastian795 Jan 2016 13:22In summer, they also run very little, and only at low speed.
And of course, you don't hear anything – that's usually the case, because the builder typically sets it up so that they don't notice it at all 😀
And of course, you don't hear anything – that's usually the case, because the builder typically sets it up so that they don't notice it at all 😀
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Peanuts745 Jan 2016 14:19Sebastian79 schrieb:
In summer, they also run less and only at low speed.
And of course you don’t hear anything – that’s usually the case, since the builder generally sets it up so you don’t notice it 😀Exactly, as you said, it’s very quiet in summer, and in winter you normally have the windows closed, so you don’t hear anything either.
And you don’t have to place it directly next to the front door or on the patio.
That’s why, if you’re not installing a heat pump yourself, you might just as well be disturbed by one from a neighbor.
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Sebastian795 Jan 2016 15:15Yes, that's exactly what I was referring to as well.
Sorry, but I would never even consider putting such a unit on my property – firstly because of the annual performance factor, and secondly because of the noise, for my own sake and especially for my neighbors.
Sorry, but I would never even consider putting such a unit on my property – firstly because of the annual performance factor, and secondly because of the noise, for my own sake and especially for my neighbors.
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