ᐅ Controlled ventilation systems vs. exhaust air heat pumps
Created on: 26 Jan 2012 14:34
J
JGaismayer
Hello,
For our KfW70 new build (145m² (1560 sq ft) + 70m² (750 sq ft) basement), we had the first meeting with a heating and ventilation specialist together with the architect. I have basically decided that I want a mechanical ventilation system with heat recovery.
In the first meeting, as with all contractors so far, I asked: What would you do in my position? The answer was: No ventilation system, but rather an exhaust air heat pump. If I understood the system correctly,
So basically a ventilation system that does not recover heat from the air, but instead heats the water, if I may summarize this as a layperson. I was told that this unit including installation is €3,000-4,000 cheaper (offers for both systems will be available in 10 days).
I should also add that a gas boiler is planned and that the property is located in a quiet cul-de-sac (quiet corner...).
Although I have read quite a bit about this online beforehand, the topic is still quite new to me... What do you think about this?
Especially since two rooms in the basement are also to be ventilated...
Thanks in advance – Julius
For our KfW70 new build (145m² (1560 sq ft) + 70m² (750 sq ft) basement), we had the first meeting with a heating and ventilation specialist together with the architect. I have basically decided that I want a mechanical ventilation system with heat recovery.
In the first meeting, as with all contractors so far, I asked: What would you do in my position? The answer was: No ventilation system, but rather an exhaust air heat pump. If I understood the system correctly,
- the windows are kept slightly air-permeable (either via ventilation slots in the frame or in the seals)
- exhaust air ducts are installed for wet rooms (bathrooms, kitchen)
- a unit is installed in the basement that draws in air and transfers heat to the domestic hot water through a heat exchanger
So basically a ventilation system that does not recover heat from the air, but instead heats the water, if I may summarize this as a layperson. I was told that this unit including installation is €3,000-4,000 cheaper (offers for both systems will be available in 10 days).
I should also add that a gas boiler is planned and that the property is located in a quiet cul-de-sac (quiet corner...).
Although I have read quite a bit about this online beforehand, the topic is still quite new to me... What do you think about this?
Especially since two rooms in the basement are also to be ventilated...
Thanks in advance – Julius
Arno schrieb:
We are planning something similar. Mechanical ventilation with heat recovery is certain, but for us it will more likely be a KfW55 house. An initial estimate suggests 40 kWh/m²a (13,000 BTU/ft²/year) and 5 kW (17,000 BTU/h) heating load for 150 m² (1,615 ft²) Estimates are usually an unreliable basis for such a significant investment decision. This should be determined with sufficient accuracy. Energy Saving Ordinance or KfW values are not suitable for this purpose and, in fact, it is even not permitted to use them. Arno schrieb:
... But space for geothermal collectors is limited and a borehole is probably not approved. Air-source heat pump? Forecasts are hardly possible without exact data. For a KfW 55 level, a ground-source heat pump is probably a bit excessive. I would definitely include a fully modulating split air-source heat pump in the considerations.Similar topics