ᐅ Design of Underfloor Heating for a KfW 55 Energy-Efficient House with a Ventilation System
Created on: 17 Feb 2023 16:29
D
dream2023
Dear users,
I am a bit overwhelmed with whether our underfloor heating is being planned correctly. The house is still in the shell stage. I have requested the installation plans and heat load calculations from the general contractor. The heat load was calculated according to DIN EN 12831. I have this calculation and the results from the planning office.
The pipe spacing is mostly 18cm (7 inches), except in the bathrooms (once 6cm (2.5 inches), once 12cm (5 inches)) and the utility room (24cm (9.5 inches)). What unsettles me more is the fact that in both bathrooms an undercoverage of the heat load is stated ("missing heat ...kW"). Additional heating devices are not planned there so far.
May I post the planning documents if I redact personal information and the data of the planning office?
Best regards
I am a bit overwhelmed with whether our underfloor heating is being planned correctly. The house is still in the shell stage. I have requested the installation plans and heat load calculations from the general contractor. The heat load was calculated according to DIN EN 12831. I have this calculation and the results from the planning office.
The pipe spacing is mostly 18cm (7 inches), except in the bathrooms (once 6cm (2.5 inches), once 12cm (5 inches)) and the utility room (24cm (9.5 inches)). What unsettles me more is the fact that in both bathrooms an undercoverage of the heat load is stated ("missing heat ...kW"). Additional heating devices are not planned there so far.
May I post the planning documents if I redact personal information and the data of the planning office?
Best regards
D
dream202320 Feb 2023 10:19Yes, the lack of coverage in the bathrooms is definitely a concern for me. But I also think it might still be possible to manage it.
Basically, I would have preferred a 15 cm (6 inch) installation spacing in the living and bedrooms. That’s not possible with the planned system. Reducing everything to 12 cm (4.7 inches) might be a bit too much...
The plan comes from the design office he hired. However, it sounded over the phone like it would be implemented as is. I’ve now asked him for an appointment, and we’ll see what further optimization suggestions he makes. I’ll be happy to share the outcome of the conversation.
I wish you the best of luck with your underfloor heating.
Basically, I would have preferred a 15 cm (6 inch) installation spacing in the living and bedrooms. That’s not possible with the planned system. Reducing everything to 12 cm (4.7 inches) might be a bit too much...
The plan comes from the design office he hired. However, it sounded over the phone like it would be implemented as is. I’ve now asked him for an appointment, and we’ll see what further optimization suggestions he makes. I’ll be happy to share the outcome of the conversation.
I wish you the best of luck with your underfloor heating.
D
dream202320 Feb 2023 11:10OWLer schrieb:
Why do you want to have 15°C (59°F) in the hallway and utility room, but only 20°C (68°F) everywhere else? Isn’t that a bit chilly?The hallway really surprises me. We didn’t specify those values. What would be an appropriate temperature for living spaces? Is 20°C (68°F) too low? What would be suitable? 22°C (72°F)?
Because this is what the standard specifies: 24°C (75°F) for the bathroom, 20°C (68°F) for living areas, and 15°C (59°F) for secondary rooms. If the heating installer follows the planner’s calculations, I would consider raising the temperature slightly. This would lead to (generally more appropriate) shorter pipe spacing in the living areas. Make sure they don’t just increase the flow temperature in order to reach these values.
D
Daniel-Sp20 Feb 2023 13:09Hello,
a temperature difference from 24°C (75°F) to 15°C (59°F) cannot be achieved in a KfW 55 standard building. If implemented as planned, you will end up heating the adjacent rooms through the bathroom, which is already underheated.
It is better to plan for 24°C (75°F) in the bathrooms and 22°C (72°F) for the rest of the rooms.
Will a controlled mechanical ventilation system be installed as well?
a temperature difference from 24°C (75°F) to 15°C (59°F) cannot be achieved in a KfW 55 standard building. If implemented as planned, you will end up heating the adjacent rooms through the bathroom, which is already underheated.
It is better to plan for 24°C (75°F) in the bathrooms and 22°C (72°F) for the rest of the rooms.
Will a controlled mechanical ventilation system be installed as well?
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