ᐅ Planning Heating and Ventilation Systems for a KfW 40 Plus Single-Family Home
Created on: 30 Sep 2020 09:56
D
DaSch17
Hello everyone,
We have a planning meeting with the heating and ventilation engineer scheduled for October/November.
In preparation, I have been wondering what I should pay special attention to and what is important. I hope to receive some valuable planning tips for this very important trade.
Brief key information about the planned new build:
- 2 full floors, clear structural height per floor 2.85 m (9 ft 4 in)
- KfW 40 Plus standard
- Heated living area approximately 190 m² (2045 ft²)
- Additional heat source: fireplace in the living/dining/kitchen area about 60 m² (645 ft²)
- Floor plan: see post #254 in https://www.hausbau-forum.de/threads/efh-neubauvorhaben-von-tag-1-an-und-die-planung-beginnt.33766/page-43
The following information and requirements (in addition to the planning documents) have already been sent to the heating/ventilation engineer:
Heating technology:
- Split air-to-water heat pump or ground-source (brine-to-water) heat pump
- Eligible for BAFA funding
- Underfloor heating in all rooms (except garage with storage room) with a target temperature of 21-22°C (70-72°F) in all rooms and 22-23°C (72-73°F) in the bathrooms
- Smart grid compatible (for using photovoltaic electricity)
- Cooling function if possible
- Hot water storage tank sized for a household of 4 persons
Controlled residential ventilation:
- Cooling function or summer bypass
What should I pay special attention to? What tips do you have?
We have a planning meeting with the heating and ventilation engineer scheduled for October/November.
In preparation, I have been wondering what I should pay special attention to and what is important. I hope to receive some valuable planning tips for this very important trade.
Brief key information about the planned new build:
- 2 full floors, clear structural height per floor 2.85 m (9 ft 4 in)
- KfW 40 Plus standard
- Heated living area approximately 190 m² (2045 ft²)
- Additional heat source: fireplace in the living/dining/kitchen area about 60 m² (645 ft²)
- Floor plan: see post #254 in https://www.hausbau-forum.de/threads/efh-neubauvorhaben-von-tag-1-an-und-die-planung-beginnt.33766/page-43
The following information and requirements (in addition to the planning documents) have already been sent to the heating/ventilation engineer:
Heating technology:
- Split air-to-water heat pump or ground-source (brine-to-water) heat pump
- Eligible for BAFA funding
- Underfloor heating in all rooms (except garage with storage room) with a target temperature of 21-22°C (70-72°F) in all rooms and 22-23°C (72-73°F) in the bathrooms
- Smart grid compatible (for using photovoltaic electricity)
- Cooling function if possible
- Hot water storage tank sized for a household of 4 persons
Controlled residential ventilation:
- Cooling function or summer bypass
What should I pay special attention to? What tips do you have?
N
nordanney1 Oct 2020 09:34DaSch17 schrieb:
that he is currently installing heat pumps that only require a flow temperature of 28 degrees to adequately heat the room. Could that be correct?Yes, if the entire system is properly designed (sizing of heating circuits, pipe spacing, and hydraulic balancing).D
Daniel-Sp1 Oct 2020 15:24DaSch17 schrieb:
Great. Looking forward to it.
During the phone call, the heating technician mentioned that he is currently installing heat pumps that only require a flow temperature of 28°C (82°F) to adequately heat the room. Is that possible? I had read somewhere that a minimum of 30°C (86°F) is necessary.This is not a matter of the heat pump itself, but depends on the design of the underfloor heating system. However, that sounds promising. I wouldn’t expect a rough, "because we’ve always done it that way" design approach here.K
knalltüte1 Oct 2020 20:33Hi,
here is a reference for our heat pump plus controlled mechanical ventilation system: Alpha Innotec 6kW ground-source heat pump plus Maico controlled mechanical ventilation costs about 20,000 € net including installation. However, we install the ventilation ductwork ourselves starting from the air distributors, which saves some money; but we do this not only for the cost savings.
Both semi-detached houses are slightly smaller than your house but consist of two residential units each. I think your costs will be somewhat higher for this reason. The boreholes (2 x 110 m (360 feet) for the entire house with about 300 m² (3,230 sq ft)) cost each party about 5,000 € net so far without renegotiation. The house is also KfW40+ standard (even passive house standard).
The underfloor heating for my 128 m² (1,377 sq ft) cost around 10,000 € net, which already includes complete floor insulation, partly with the expensive WLG 023 thermal conductivity class ;-(
However, I might be mistaken about the cost of the underfloor heating; it seems a bit high to me right now...
According to calculations, as far as I remember correctly, a 6 kW heat pump alone would have been sufficient for the entire house since the demand was 5.3 kW. However, this was not feasible due to the legal division of the property (Realteilung).
here is a reference for our heat pump plus controlled mechanical ventilation system: Alpha Innotec 6kW ground-source heat pump plus Maico controlled mechanical ventilation costs about 20,000 € net including installation. However, we install the ventilation ductwork ourselves starting from the air distributors, which saves some money; but we do this not only for the cost savings.
Both semi-detached houses are slightly smaller than your house but consist of two residential units each. I think your costs will be somewhat higher for this reason. The boreholes (2 x 110 m (360 feet) for the entire house with about 300 m² (3,230 sq ft)) cost each party about 5,000 € net so far without renegotiation. The house is also KfW40+ standard (even passive house standard).
The underfloor heating for my 128 m² (1,377 sq ft) cost around 10,000 € net, which already includes complete floor insulation, partly with the expensive WLG 023 thermal conductivity class ;-(
However, I might be mistaken about the cost of the underfloor heating; it seems a bit high to me right now...
According to calculations, as far as I remember correctly, a 6 kW heat pump alone would have been sufficient for the entire house since the demand was 5.3 kW. However, this was not feasible due to the legal division of the property (Realteilung).
@superzapp If I calculated correctly, you’re looking at around 42,000 EUR in total with heat pump including drilling. I think my estimate of 40,000 plus drilling is quite realistic.
Can you get a fixed price for the drilling based on the soil survey, or is it always just an estimate with possible additional costs on top?
superzapp schrieb:
The drilling (2x 110m (360 feet) for the entire house with about 300m² (3,230 sq ft)) currently costs each party 5,000 EUR net without renegotiation.
Can you get a fixed price for the drilling based on the soil survey, or is it always just an estimate with possible additional costs on top?
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