Hello everyone,
We have commissioned our builder to install a geothermal heat pump with deep drilling.
The heating technician plans to install a Junkers STM-100 model.
This will be combined with a hot water storage tank and a buffer tank for the underfloor heating system.
Additionally, a Wolf CWL 300 or Wolf 400 ventilation system with heat recovery is planned.
Since we have no knowledge of this topic at all, it is very difficult for us to assess it.
In principle, we trust the builder and the heating technician, but our experience with our last build showed that asking some reasonably intelligent questions can lead to significant improvements in the equipment used.
Does anyone have any tips on what we should pay attention to?
Thank you very much
Ostsee
We have commissioned our builder to install a geothermal heat pump with deep drilling.
The heating technician plans to install a Junkers STM-100 model.
This will be combined with a hot water storage tank and a buffer tank for the underfloor heating system.
Additionally, a Wolf CWL 300 or Wolf 400 ventilation system with heat recovery is planned.
Since we have no knowledge of this topic at all, it is very difficult for us to assess it.
In principle, we trust the builder and the heating technician, but our experience with our last build showed that asking some reasonably intelligent questions can lead to significant improvements in the equipment used.
Does anyone have any tips on what we should pay attention to?
Thank you very much
Ostsee
ostsee schrieb:
...we commissioned a geothermal heat pump with deep drilling from our builder. The heating technician wants to install a Junkers STM-100 model. What heating demand was calculated according to DIN 12831? Were the thermally effective air volume flows (air volume plan according to DIN 1946-6) of the controlled residential ventilation system sufficiently taken into account? What demand (energy, capacity) was determined for the source sizing?
ostsee schrieb:
...and a buffer tank for the underfloor heating. With brine-to-water heat pumps, a buffer tank (what type is meant here – separation, series, parallel?) can significantly reduce the annual performance factor and should be avoided if possible! ostsee schrieb:
...In principle, we naturally trust the builder and the heating technician, ... I would not be so optimistic about that. ostsee schrieb:
...Does anyone have tips on what we should pay attention to? Yes, have the complete planning documents thoroughly reviewed. Best regards.
Hmm... let’s see, we have an energy performance certificate according to DIN 4108-6 and DIN 4701-10.
Usable floor area is approximately 240 m² (2583 ft²)
Volume approximately 760 m³ (26833 ft³)
Building envelope approximately 590 m² (6351 ft²)
Windows approximately 52 m² (560 ft²)
If I understand the sources correctly, the energy consultant provides the following figures:
Total Heat
Domestic hot water = 1446 kWh/year
Heating = 1151 kWh/year
Ventilation = 0 kWh/year
Total Auxiliary Energy
Domestic hot water = 218 kWh/year
Heating = 663 kWh/year
Ventilation = 724 kWh/year
Total Primary Energy:
Domestic hot water = 4326 kWh/year
Heating = 4716 kWh/year
Ventilation = 1882 kWh/year
According to the developer, the buffer storage tank is necessary to ensure a certain circulation volume.
I admit that I didn’t really understand this whole thing.
According to their information, one or more heating circuits would have to be left open and unregulated if the system does not include a buffer storage tank...
Usable floor area is approximately 240 m² (2583 ft²)
Volume approximately 760 m³ (26833 ft³)
Building envelope approximately 590 m² (6351 ft²)
Windows approximately 52 m² (560 ft²)
If I understand the sources correctly, the energy consultant provides the following figures:
Total Heat
Domestic hot water = 1446 kWh/year
Heating = 1151 kWh/year
Ventilation = 0 kWh/year
Total Auxiliary Energy
Domestic hot water = 218 kWh/year
Heating = 663 kWh/year
Ventilation = 724 kWh/year
Total Primary Energy:
Domestic hot water = 4326 kWh/year
Heating = 4716 kWh/year
Ventilation = 1882 kWh/year
According to the developer, the buffer storage tank is necessary to ensure a certain circulation volume.
I admit that I didn’t really understand this whole thing.
According to their information, one or more heating circuits would have to be left open and unregulated if the system does not include a buffer storage tank...
B
Bauexperte19 May 2012 10:16Hello,
This is currently the latest trend; almost every second prospective buyer comes with such a statement.... in most cases paid for expensively but not really practical.
€uro will be able to explain the rest to you better than anyone else here on the HBF.
Kind regards
ostsee schrieb:
According to the developer, the buffer tank is necessary to guarantee a certain circulation volume....
This is currently the latest trend; almost every second prospective buyer comes with such a statement.... in most cases paid for expensively but not really practical.
€uro will be able to explain the rest to you better than anyone else here on the HBF.
Kind regards
ostsee schrieb:
Hmm.. let's see, we have an energy saving regulation certificate according to DIN 4108-6 and DIN 4701-10.... This certificate’s only purpose is to decide on the project’s compliance in terms of primary energy on "paper" only! If you look closely at the fine print, you will notice that actual cost estimates for consumption or heating system sizing are not permitted based on these specifications!ostsee schrieb:
....According to the developer, the buffer tank is necessary to guarantee some circulation volume. It will be a general contractor/subcontractor, not a developer. Furthermore, they probably contracted the cheapest subcontractor available for heating and domestic hot water. This subcontractor is likely incapable of proper system sizing. Most likely, a parallel buffer tank? is being installed as a makeshift solution because they don’t understand the hydraulics. This adds both cost and reduces efficiency!ostsee schrieb:
....I admit that I didn’t really understand the whole thing That is always convenient for a salesperson.ostsee schrieb:
...According to him, we would have to leave one or more heating circuits open and unregulated if no buffer tank is integrated into the system... Technical nonsense! Ask to see all calculation documents beforehand! They probably don’t even exist.Best regards,
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