ᐅ Supply Temperature for Underfloor Heating in New Construction: 38°C

Created on: 31 Oct 2016 09:49
R
rudiherbert
R
rudiherbert
31 Oct 2016 09:49
Good day.
Our pellet heating system in the KfW 70 multi-family house (new build with 6 units) shows a floor heating supply temperature of 38°C (100°F) in the boiler room.
In my opinion, the pellet consumption is quite high.
Over 1 ton of pellets was used in October (which was not very cold).

Therefore, my question is whether a supply temperature of 38°C (100°F) is too high for this new building (the construction is dry!).

Thank you very much
rudi
L
Legurit
31 Oct 2016 10:17
Our lead time is currently at 24.5°C (76.1°F) (when the outside temperature drops below 10°C (50°F)).
However, I am not sure how a pellet heating system is controlled... how it cycles... how long it runs and what it does during operation – through a buffer tank?
K
Knallkörper
31 Oct 2016 14:34
The temperature in the supply line doesn’t provide much information unless the flow rate is also given. Perhaps 34°C (93°F) is fine for the pellet stove. It’s not a heat pump, which can operate more efficiently at lower temperatures.
L
Legurit
31 Oct 2016 15:04
Exactly, that's why I am asking these follow-up questions.
G
garfunkel
31 Oct 2016 21:53
How does the high supply temperature affect the heating in the apartment? Is it already very warm at low control levels and extremely hot at the maximum setting?

Maybe it is also the domestic hot water that has this supply temperature?
R
rudiherbert
1 Nov 2016 09:16
garfunkel schrieb:
How does the high supply temperature affect the heating inside the apartment? Is it already very warm at low controller settings and extremely hot on maximum?

Maybe it's the domestic hot water that has this supply temperature?

Good day.
I will test this.
The heating in the apartment is not running yet!
I have read the supply temperature in the boiler room.
I will turn the room thermostat all the way up and measure or read the room temperature, the floor temperature, and the supply temperature in my distribution cabinet.
I will also check the position of the float in the glass tube.
At the moment, all tubes are fully filled, and the marker (red float) is at the very top.

I will report back.

Thank you