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?
Could you please provide the name of the engineering firm?
I just realized that my heating engineer has already commissioned the heating load calculation, but without any specifications, so it was done according to DIN standards...
Can anyone here say if a heating load calculation according to DIN (and installation plan) can be converted to other parameters?
Or should I just start a new thread...?
I just realized that my heating engineer has already commissioned the heating load calculation, but without any specifications, so it was done according to DIN standards...
Can anyone here say if a heating load calculation according to DIN (and installation plan) can be converted to other parameters?
Or should I just start a new thread...?
Tolentino schrieb:
Could you please share the name of the engineering firm?
Because I just found out that my heating engineer has already commissioned the heat load calculation without providing specific parameters, so it was done according to DIN standards...
Can anyone here say if a heat load calculation done according to DIN (and the installation plan) can be converted to other parameters?
Or maybe I should just open a new thread... What’s wrong with it being done according to DIN? The firm I found via Google also uses that.
Try searching for IB Heckmann and heat load calculation...
DaSch17 schrieb:
What’s wrong with the fact that it was done according to DIN standards? Interpreting the DIN standard is certainly not an issue. However, the DIN temperature recommendations are more debatable. My wife definitely wouldn’t accept 20°C (68°F) in living areas.
OWLer schrieb:
Design according to DIN standards is certainly not a problem. Temperatures according to DIN standards are more of an issue. My wife definitely wouldn’t accept 20°C (68°F) in living areas.Oh, yes, that’s true. But you can change that with the mentioned independent building consultant (just specify it in the commissioning questionnaire).
We have 22°C (72°F) in the living areas and 23-24°C (73-75°F) in the bathrooms.
K
knalltüte2 Nov 2020 21:28DaSch17 schrieb:
... What do you mean by that? Probably an additional hot water storage tank, since both the flexoTHERM and the aroTHERM only have 190L (50 gallons) tanks. In my opinion, that is too small for a household of four. And otherwise, just a controlled mechanical ventilation system.
...One might think that 180-190L (47-50 gallons) should be sufficient for four people, but possibly with some minor compromises in comfort (Is there a bathtub? Do they all shower at the same time or within a short time frame?)Heating engineers almost always size the storage tank too large, and an oversized tank then causes other problems (efficiency, hygiene/legionella).
Regarding the hot water storage tank:
We (2 adults, 2 children) have a 300L (79 gallons) tank. Showers tend to be quite long (wife) and we have a large rain showerhead, so a lot of water is used. The bathtub is also used regularly.
The 300L (79 gallons) tank seems perfectly sized to me – it shouldn’t be any smaller.
We (2 adults, 2 children) have a 300L (79 gallons) tank. Showers tend to be quite long (wife) and we have a large rain showerhead, so a lot of water is used. The bathtub is also used regularly.
The 300L (79 gallons) tank seems perfectly sized to me – it shouldn’t be any smaller.
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