ᐅ Screed drying using a ground source heat pump with trench collector
Created on: 10 Aug 2014 13:31
T
Tauben1a
Hello,
I installed a ground source heat pump with a trench collector for my building project in Brunnthal near Munich.
So far, everything has gone excellently.
However, a discussion has arisen regarding drying the screed using the heat pump and trench collector, specifically about the supply temperature for screed drying.
Our heating contractor used a maximum supply temperature of 45 degrees Celsius (113°F) for the screed drying. This temperature was reached without any problems. The 45 degrees corresponds to the maximum temperature of the built-in screed drying program of the Vaillant heat pump. We did not use the program itself, in agreement with the site manager, because an accelerator was used in the screed and the screed drying program would have taken too long. Therefore, the temperatures were manually adjusted.
The site manager now believes that a supply temperature of 55 degrees Celsius (131°F) should have been used for screed drying, which is 10 degrees higher. This temperature is based on the manufacturer’s specifications for the screed/accelerator, although this specification is not entirely clear, as it requires a maximum supply temperature of the heating system but no higher than 55 degrees. According to Vaillant, the ground source heat pump can practically reach up to 58 degrees Celsius (136°F).
However, the heating contractor says he cannot guarantee such high temperatures because this could cause freezing of the trench collector, which in turn could damage the collector, potentially rendering it unusable.
I also found various warnings about this on the internet.
Does anyone have experience with using a ground source collector (especially a trench collector) for screed drying? Could someone provide information about the maximum supply temperature that can or should not be exceeded with a ground source collector (especially a trench collector)?
Thank you and best regards
Tauben1a
I installed a ground source heat pump with a trench collector for my building project in Brunnthal near Munich.
So far, everything has gone excellently.
However, a discussion has arisen regarding drying the screed using the heat pump and trench collector, specifically about the supply temperature for screed drying.
Our heating contractor used a maximum supply temperature of 45 degrees Celsius (113°F) for the screed drying. This temperature was reached without any problems. The 45 degrees corresponds to the maximum temperature of the built-in screed drying program of the Vaillant heat pump. We did not use the program itself, in agreement with the site manager, because an accelerator was used in the screed and the screed drying program would have taken too long. Therefore, the temperatures were manually adjusted.
The site manager now believes that a supply temperature of 55 degrees Celsius (131°F) should have been used for screed drying, which is 10 degrees higher. This temperature is based on the manufacturer’s specifications for the screed/accelerator, although this specification is not entirely clear, as it requires a maximum supply temperature of the heating system but no higher than 55 degrees. According to Vaillant, the ground source heat pump can practically reach up to 58 degrees Celsius (136°F).
However, the heating contractor says he cannot guarantee such high temperatures because this could cause freezing of the trench collector, which in turn could damage the collector, potentially rendering it unusable.
I also found various warnings about this on the internet.
Does anyone have experience with using a ground source collector (especially a trench collector) for screed drying? Could someone provide information about the maximum supply temperature that can or should not be exceeded with a ground source collector (especially a trench collector)?
Thank you and best regards
Tauben1a
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