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 🙂
I have now acquired my second pellet fireplace stove.
Both operate without a buffer tank and modulate very little. The radiators are sized larger accordingly (heat pump design). One heats a volume of 800m³ (28,250 ft³), the other 600m³ (21,190 ft³), each with a capacity over 20 kW. Domestic hot water is provided by 7.5m² (81 ft²) of solar thermal panels on one, and by an on-demand water heater on the other.
Both have somehow made controlled residential ventilation unnecessary. The amazing thing is that I am able to approach the KfW55 energy-saving standard from 2009, even though the buildings were constructed to KfW100 or higher. Old, newly rediscovered heating methods work effectively again, which had been forgotten due to the typical undersizing seen today.
Happy New Year.
Both operate without a buffer tank and modulate very little. The radiators are sized larger accordingly (heat pump design). One heats a volume of 800m³ (28,250 ft³), the other 600m³ (21,190 ft³), each with a capacity over 20 kW. Domestic hot water is provided by 7.5m² (81 ft²) of solar thermal panels on one, and by an on-demand water heater on the other.
Both have somehow made controlled residential ventilation unnecessary. The amazing thing is that I am able to approach the KfW55 energy-saving standard from 2009, even though the buildings were constructed to KfW100 or higher. Old, newly rediscovered heating methods work effectively again, which had been forgotten due to the typical undersizing seen today.
Happy New Year.
No funding is available because everything was built by myself not according to the regulations, which tend to prohibit more sensible solutions rather than allow them; therefore, there is no real primary energy factor.
PS: According to the Energy Saving Ordinance, an almost 100% loss-free heating system could not be installed.
PS: According to the Energy Saving Ordinance, an almost 100% loss-free heating system could not be installed.
What interests me is only the very low energy consumption of the large, solidly built house; the fuel fits into a corner of the garage. Tricks to manipulate the KfW rating are not of interest here! 🙂
Pellets are calculated with a primary energy factor of 0.2. This makes it easy to achieve a better rating.
In reality, however, heating systems in homes show higher consumption due to greater losses, similar to issues seen with VW.
For that reason, I simply left those losses out from the start.
Pellets are calculated with a primary energy factor of 0.2. This makes it easy to achieve a better rating.
In reality, however, heating systems in homes show higher consumption due to greater losses, similar to issues seen with VW.
For that reason, I simply left those losses out from the start.
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