Hello,
My husband and I are currently trying to decide which heating system to install in our planned house.
I insist on having a ventilation system and a wood-burning stove in the living room. So the heating should be compatible with these.
Our chosen construction company has now offered us three heat pumps:
Air-to-water heat pump: Nibe F2040-8 with Nibe VVM320
Exhaust air heat pump: Nibe F750 P with supply air module SAM 40
Ground source heat pump: Nibe 1245-6 with deep drilling
My husband currently prefers the exhaust air heat pump because he thinks it works like the air-to-water heat pump but makes better use of the warm air from running computers... Everywhere I read, though, it says: "Avoid exhaust air heat pumps unless you are building a passive house."
Does the supply air module actually make it function somewhat like an air-to-water heat pump, but with better use of the warm indoor air?
The house is planned as a two-story timber frame construction with KfW 55 standard. To be honest, I am completely overwhelmed by this complicated heating topic. The more information I get, the more complex it seems.
My husband and I are currently trying to decide which heating system to install in our planned house.
I insist on having a ventilation system and a wood-burning stove in the living room. So the heating should be compatible with these.
Our chosen construction company has now offered us three heat pumps:
Air-to-water heat pump: Nibe F2040-8 with Nibe VVM320
Exhaust air heat pump: Nibe F750 P with supply air module SAM 40
Ground source heat pump: Nibe 1245-6 with deep drilling
My husband currently prefers the exhaust air heat pump because he thinks it works like the air-to-water heat pump but makes better use of the warm air from running computers... Everywhere I read, though, it says: "Avoid exhaust air heat pumps unless you are building a passive house."
Does the supply air module actually make it function somewhat like an air-to-water heat pump, but with better use of the warm indoor air?
The house is planned as a two-story timber frame construction with KfW 55 standard. To be honest, I am completely overwhelmed by this complicated heating topic. The more information I get, the more complex it seems.
T
toxicmolotof7 Sep 2016 17:10An exhaust air heat pump can never compensate for a loss of 6kW... At least not according to my understanding of the system.
I like the pink forum, but repeating the same points over and over is quite annoying.
- Everything except Passive House standard is rubbish, no matter how uneconomical it might be....
- Trench collectors are the only true form of energy harvesting, and the cost comparisons are always conveniently made between DIY trench installation and all the other options fully installed by professionals, with disadvantages completely ignored or dismissed...
On the topic: No exhaust air heat pump, I totally agree. Whether geothermal or air-to-water heat pumps are the better choice depends on economic efficiency and heavily relies on the quotes for the systems as well as various other conditions. There is no clear right or wrong here; each case must be assessed individually.
- Everything except Passive House standard is rubbish, no matter how uneconomical it might be....
- Trench collectors are the only true form of energy harvesting, and the cost comparisons are always conveniently made between DIY trench installation and all the other options fully installed by professionals, with disadvantages completely ignored or dismissed...
On the topic: No exhaust air heat pump, I totally agree. Whether geothermal or air-to-water heat pumps are the better choice depends on economic efficiency and heavily relies on the quotes for the systems as well as various other conditions. There is no clear right or wrong here; each case must be assessed individually.
R0Li84 schrieb:
By the way, planting on the properties above is no problem at all. Or are you all avoiding planting trees because the drinking water pipe runs into the house at that spot? (It’s made of the same material as the brine pipes and lasts forever).Our heating system uses ground collectors installed in the garden. We were specifically advised not to plant anything with deep roots over them. Especially in spring, you can notice from the vegetation and snowmelt that the soil is a bit cooler. The advantage: lawn mowing starts 14 days later.
Saruss schrieb:
I wouldn’t want to blow 6kW of hot air around..Nobody does that, right? The exhaust air heat pump also heats via underfloor heating.
Tego12 schrieb:
On the topic: No exhaust air heat pump, totally agree with that. Yes, but WHY?
Alright, often these are air-to-air heat pumps. But even if the heat pump is supposed to transfer heat into water, consider this: if you need 6 kW (kiloWatts) of heat, where does it come from? From your exhaust air? If the exhaust air heat pump operates with a COP (coefficient of performance) of only 2, it requires 3 kW (kiloWatts) of heat from the exhaust air. Unfortunately, the heat capacity of air is very low, so it needs to draw in a large volume of exhaust air. How is this replaced? By fresh, cold air from outside. To prevent the indoors from getting cold, this air must also be heated by the heating system. This requires even more exhaust air, and so on. The exhaust air heat pump eventually ends up working just to generate enough warm air to keep running. At a certain outdoor temperature or required output, this simply fails, and you end up heating directly with electricity.
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