ᐅ New Construction + Exhaust Air Heat Pump According to Provider, Is a Trench Collector Affordable?
Created on: 13 Mar 2016 16:19
E
expose
Hello,
I am currently working on a new construction project that is approaching the final stages, except for the heating system. Originally, a gas boiler with solar support for domestic hot water was planned. This would make the house comply with the KfW 70 energy standard. It is a bungalow with 125 m² (1345 sq ft) of living space (4 rooms, kitchen integrated into the living area, bathroom, toilet, utility room) on an 835 m² (8980 sq ft) plot.
The builder has now proposed an exhaust air heat pump with decentralized ventilation. The additional costs, including extra insulation of the floor slab to meet the KfW 55 standard, are around 6,000–7,000 euros. In principle, I like the idea of being independent from fossil fuels, but after looking closely at such a heating system, I am not completely convinced by the concept. Especially the ventilation seemed questionable to me, as there was a noticeable cold draft and the rooms felt somewhat stuffy overall.
The builder himself has no experience with these heat pumps yet but plans to install several in the future.
During my research on exhaust air heat pumps, I also came across heat pump technology with ground loop collectors and find this concept much more interesting.
The fact is, the extra cost compared to the gas boiler, about 6,000–7,000 euros, represents the upper limit of my budget. It must not get more expensive.
I am a bit unsure about how to proceed. How can I determine whether a ground loop collector would be suitable, and whether it would fit my budget? Are there possibly other heat pumps with external units that might be an option? Or could my concerns about the exhaust air heat pump be unfounded?
Thank you in advance.
I am currently working on a new construction project that is approaching the final stages, except for the heating system. Originally, a gas boiler with solar support for domestic hot water was planned. This would make the house comply with the KfW 70 energy standard. It is a bungalow with 125 m² (1345 sq ft) of living space (4 rooms, kitchen integrated into the living area, bathroom, toilet, utility room) on an 835 m² (8980 sq ft) plot.
The builder has now proposed an exhaust air heat pump with decentralized ventilation. The additional costs, including extra insulation of the floor slab to meet the KfW 55 standard, are around 6,000–7,000 euros. In principle, I like the idea of being independent from fossil fuels, but after looking closely at such a heating system, I am not completely convinced by the concept. Especially the ventilation seemed questionable to me, as there was a noticeable cold draft and the rooms felt somewhat stuffy overall.
The builder himself has no experience with these heat pumps yet but plans to install several in the future.
During my research on exhaust air heat pumps, I also came across heat pump technology with ground loop collectors and find this concept much more interesting.
The fact is, the extra cost compared to the gas boiler, about 6,000–7,000 euros, represents the upper limit of my budget. It must not get more expensive.
I am a bit unsure about how to proceed. How can I determine whether a ground loop collector would be suitable, and whether it would fit my budget? Are there possibly other heat pumps with external units that might be an option? Or could my concerns about the exhaust air heat pump be unfounded?
Thank you in advance.
Curly schrieb:
I find such systems simply not practical in areas where the plots are hardly larger than 400 m² (4300 sq ft). This means there is no way to avoid disturbing the neighbors with the noise. I think the statement that "such systems" (air-to-water heat pumps) are not practical in densely built areas is a bit too general! At least for units installed inside the house, this issue should not apply. So the possibility does exist.
N
nasenmann4 Apr 2016 13:40Curly schrieb:
I find constant background noise even worse than occasional passing vehicles.
Best regards,
SabineIf the device is continuously making noise, something must have gone seriously wrong. I remember wanting to check how loud the unit was at my place. It took a long time before I was actually standing in front of it while it was running. From the neighbor’s terrace, you couldn’t hear anything at all.
With today’s weather, when I get home, the heating controller shows that the pump last ran 10 hours ago—for just a few minutes.
In the summer, it hardly runs at all. The hot water is then supplied more than enough through the solar thermal system on the roof.
Noise disturbance is something else entirely.
Also, if the pump runs more frequently in winter, hardly anyone sleeps with the window open or feels disturbed relaxing in the hammock in the garden.
Honestly, before building, I also worried about whether it might be too loud and disturb neighbors. Possibly cheap, noisy units have been installed incorrectly here and there. But what I have heard and seen at friends’ and acquaintances’ places convinced me otherwise. There is certainly no basis for generalizing that air-to-water heat pumps are loud and cause disturbance.
In our street, someone has an air-to-water heat pump installed in the utility room, with two air outlets to the outside—one facing the street and the other towards the neighbor. When I approach this house, I can hear the sound of rushing air from about 15 meters (50 feet) away. Is that normal?
Regards,
Sabine
Regards,
Sabine
nasenmann schrieb:
In summer, it will hardly run at all. Hot water is then supplied more than enough through the roof. Noise pollution is a different matter.However, most have eliminated the uneconomical solar panels by using an air-source heat pump.
N
nasenmann4 Apr 2016 15:38It’s not always just about cost-effectiveness, but that’s another topic.
Even when the pump has to produce hot water in sunshine, it won’t become a constant running noise.
Even when the pump has to produce hot water in sunshine, it won’t become a constant running noise.
I have been using an air-to-water heat pump for three years now and am very satisfied.
Heating and hot water costs are around €65 per month / year-round.
Bathroom/living room temperature is about 23°C (73°F), total living area approximately 200m² (2,150 ft²).
Noise disturbance? When I stand on the porch at night and hear the oil burner pump from the neighboring house starting up (through the chimney), it is about as loud as my heat pump. And in summer, it hardly runs at all, while in winter the windows are closed anyway.
PS: I decided against a ventilation system – it did not appeal to me.
Heating and hot water costs are around €65 per month / year-round.
Bathroom/living room temperature is about 23°C (73°F), total living area approximately 200m² (2,150 ft²).
Noise disturbance? When I stand on the porch at night and hear the oil burner pump from the neighboring house starting up (through the chimney), it is about as loud as my heat pump. And in summer, it hardly runs at all, while in winter the windows are closed anyway.
PS: I decided against a ventilation system – it did not appeal to me.
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