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?
Does the outdoor unit of the air-to-water heat pump need to be placed within the building plot? Or can the outdoor unit also be positioned 1m (3 feet) in front of the property boundary?
The neighbor would not be significantly affected, as there is a slight slope of about 1m (3 feet) between the properties.
The neighbor would not be significantly affected, as there is a slight slope of about 1m (3 feet) between the properties.
DaSch17 schrieb:
Hello everyone,
today is the first consultation appointment with the heating engineer who will be installing the heating and ventilation systems. Is there anything I should point out to them or ask about during this meeting?
Thanks The maximum pipe spacing for the underfloor heating should be 10cm (4 inches), and I believe the length for each heating circuit should be between 80-100m (260-330 feet). I learned this from the forum.
Also, there should be a heating load calculation for each room.
T
T_im_Norden30 Oct 2020 13:06Room-by-room heating load calculation and provision of these results.
Specify the heating flow temperature; I would not accept anything above 30°C (86°F).
Set the temperature for each individual room.
Heating circuits should not be longer than 100 meters (330 feet), all approximately the same length.
Do not go below 17x2 mm (¾ x ⅛ inches) pipe size.
Discuss the use of wall heating in bathrooms.
Have it installed under the shower and bathtub.
Try to avoid circuits made from multiple sections joined by press fittings.
Ensure the connection to the heating control valve is adequately sized.
Specify the heating flow temperature; I would not accept anything above 30°C (86°F).
Set the temperature for each individual room.
Heating circuits should not be longer than 100 meters (330 feet), all approximately the same length.
Do not go below 17x2 mm (¾ x ⅛ inches) pipe size.
Discuss the use of wall heating in bathrooms.
Have it installed under the shower and bathtub.
Try to avoid circuits made from multiple sections joined by press fittings.
Ensure the connection to the heating control valve is adequately sized.
What is the reason for designing a KfW40+ house with a hydronic heating system instead of using electric heating like infrared and only heating the domestic hot water with a heat pump?
Whether the fireplace will still be allowed to operate from 2026 onwards is also questionable, since the fuel is fossil, like oil.
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Room-by-room heating load calculation and provision of this data.
Specify the heating system’s flow temperature; I would not accept anything above 30°C (86°F).
And then you want to achieve at least 24°C (75°F) in rooms such as the bathroom?
Whether the fireplace will still be allowed to operate from 2026 onwards is also questionable, since the fuel is fossil, like oil.
---
Room-by-room heating load calculation and provision of this data.
Specify the heating system’s flow temperature; I would not accept anything above 30°C (86°F).
And then you want to achieve at least 24°C (75°F) in rooms such as the bathroom?
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