Is the power consumption and procedure for screed drying normal?

Hi everyone,

I am building intensively and according to the site manager, a construction dryer is needed for the screed drying. Ergo, for the past week, about 270 sqm have been constantly heated with a 15KW heating device at a flow temperature of 35 degrees. According to the protocol, you should start at 25 degrees but nobody cares about that.

Water is dripping from the walls and the windows are always wet like in a sauna.
Will it get better? Eventually, the water has to be out, right?
I ventilate twice a day, sometimes even three times, and always remove visible droplets.
The consumption at 35 degrees is 200 kWh per day. I calculated that I will reach over 4000 kWh with the planned 3 weeks.
Does that make sense or does it seem like something is broken with the device?

Moisture is seeping in from above through the precast ceilings, is that normal?
Unfortunately, my site manager is not very committed, so I am looking for advice here.

Best regards, Felix

Yes, sorry of course the underfloor heating will be done by me 0. But it's a 20KV heating device and 200kwh consumption per day with 270sqm heating area. Fits, that seems very much to me. That way heating will cost me 2,000€ in the end.

But it is a 20KV heating device

20,000 volts? Or do you mean 20kW - that would be a maximum of 480kWh at full load daily.

So yes, the consumption level is plausible and could easily be twice as high.

Therefore, for 1 week now, about 270 sqm has been heated constantly with a 15KV heating device at a flow temperature of 35 degrees. According to protocol, you should start at 25 degrees but nobody cares.

Then your expert should intervene immediately. There are heating-up protocols for that (although nowadays they are not really meaningful and I myself would dry like that too).
By the way, that would be a 15kW heating device, which could draw a maximum of 360kWh per day. Do you have two devices running?

Water is dripping from the walls and the windows are always wet like in a sauna.
Does it get better? Eventually the water has to be outside, right?

After one week, that is still completely normal.

I calculated that I will reach over 4000 kWh for the planned 3 weeks.

That is also plausible for such a large palace.

for the planned 3 weeks.

For what kind of screed? What kind of heating is being done? Functional heating and/or surface readiness heating?

It is a single 20kw device and it has been running functional heating with a supply temperature of 35 degrees for 1 week. I know it should have started at 25 but for me it started at 35. The construction manager says the screed company has everything under control. It is a CA screed. I thought the heating engineer would come daily but no way, he will probably come only when the temperature is increased.

It is a single 20kw unit

OK. Consumption fits easily.

Functional heating with a flow temperature of 35 degrees has been running for 1 week.

It is plausible, since with new construction this is probably already well above the maximum temperature of the heat pump/floor heating.

The construction manager says the screed company has everything under control.

If they guarantee the functionality in the end, you shouldn’t worry. In fact, they also save costs through this heating method.

I thought the heating engineer comes daily but nope, he’ll probably come only when the temperature is raised.

He doesn’t come anymore. And assume that the temperature won’t be raised either (why should it?).

Summary: It may not be correct according to formal heating-up protocols, but those protocols date back to times with much higher flow temperatures during heating operation. Consumption is also normal. Humidity as well.