Hello everyone,
We are currently building a house and are generally quite satisfied with the construction company. I have already asked a few questions here about the heating system and so on. In the contract, I had it specified that a heat demand calculation according to DIN 12831 should be carried out.
Now, after selecting the fixtures and finishes, I received a calculation according to DIN 4701 (Energy Saving Ordinance 2009).
I still feel on the safe side since everything is documented in writing. What puzzles me now is—shouldn’t the heat demand calculation be done soon? Is the construction company making things difficult for themselves?
We decided beforehand on a geothermal heat pump with brine and heat recovery in a KfW 55 house. Assuming it turns out to be insufficient—what would happen then? (It’s clear that it would either be cold or expensive.) Could it be that we might have to pay a lot more if the heating is undersized? Or am I worrying too much?
Best regards and many thanks,
We are currently building a house and are generally quite satisfied with the construction company. I have already asked a few questions here about the heating system and so on. In the contract, I had it specified that a heat demand calculation according to DIN 12831 should be carried out.
Now, after selecting the fixtures and finishes, I received a calculation according to DIN 4701 (Energy Saving Ordinance 2009).
I still feel on the safe side since everything is documented in writing. What puzzles me now is—shouldn’t the heat demand calculation be done soon? Is the construction company making things difficult for themselves?
We decided beforehand on a geothermal heat pump with brine and heat recovery in a KfW 55 house. Assuming it turns out to be insufficient—what would happen then? (It’s clear that it would either be cold or expensive.) Could it be that we might have to pay a lot more if the heating is undersized? Or am I worrying too much?
Best regards and many thanks,
haunt schrieb:
...they should be available on site. That would then be fine. Only the heating surface sizing and the hydraulics are still missing. Is a mechanical ventilation system planned?Best regards
The documents arrived today:
According to the DIN 12831 calculation, our house has a Qn value of 4318 watts.
A Nilan compact system is planned for heating. According to the manufacturer, the heat pump provides 3 kW and the controlled residential ventilation (VP18) provides 2 kW. As a backup, there is also a 2 kW electric heating element.
Underfloor heating will be installed throughout the entire house.
What surprises me is that the calculation states: Category 1b (according to the Energy Saving Ordinance without mechanical ventilation system).
Otherwise, it looks good, doesn’t it?
Best regards,
Haunt
According to the DIN 12831 calculation, our house has a Qn value of 4318 watts.
A Nilan compact system is planned for heating. According to the manufacturer, the heat pump provides 3 kW and the controlled residential ventilation (VP18) provides 2 kW. As a backup, there is also a 2 kW electric heating element.
Underfloor heating will be installed throughout the entire house.
What surprises me is that the calculation states: Category 1b (according to the Energy Saving Ordinance without mechanical ventilation system).
Otherwise, it looks good, doesn’t it?
Best regards,
Haunt
Edit:
Manufacturer’s specifications:
For the COMPACT P: Heat transfer approximately 2 kW
Heating output without outdoor air preheating approximately 500 W, with outdoor air preheating approximately 1000 W, each based on -12°C (10°F)
For the JVP3:
At 100% power, 3.9 kW at S0/W35
At 80% power, approximately 2.9 kW at S0/W35
To be honest, I don’t understand the manufacturer’s responses. Do I now have to subtract the 2 kW heat transfer of the controlled residential ventilation system from the heating load calculation?
Confused regards
Manufacturer’s specifications:
For the COMPACT P: Heat transfer approximately 2 kW
Heating output without outdoor air preheating approximately 500 W, with outdoor air preheating approximately 1000 W, each based on -12°C (10°F)
For the JVP3:
At 100% power, 3.9 kW at S0/W35
At 80% power, approximately 2.9 kW at S0/W35
To be honest, I don’t understand the manufacturer’s responses. Do I now have to subtract the 2 kW heat transfer of the controlled residential ventilation system from the heating load calculation?
Confused regards
haunt schrieb:
...What surprises me is that the calculation states: Category 1b (according to the Energy Saving Ordinance without mechanical ventilation system) This likely means the entire heating load calculation is incorrect, which, by the way, is not uncommon. Best regards
Today I had a long conversation with the heating system manufacturer. They received the heat demand calculation from our home builder, which I find very positive.
Of course, I am just a layperson and cannot assess the situation fully, but according to the company, I can expect a total electricity consumption of 6,000 kWh (6,000 kilowatt-hours) per year.
3,000 kWh (3,000 kilowatt-hours) for the heating system
3,000 kWh (3,000 kilowatt-hours) for private consumption (which aligns with our experience)
There are suitable packages available online. Thanks to the home builder, we already have a second meter in the house and will probably be able to negotiate an even cheaper tariff.
Of course, I am just a layperson and cannot assess the situation fully, but according to the company, I can expect a total electricity consumption of 6,000 kWh (6,000 kilowatt-hours) per year.
3,000 kWh (3,000 kilowatt-hours) for the heating system
3,000 kWh (3,000 kilowatt-hours) for private consumption (which aligns with our experience)
There are suitable packages available online. Thanks to the home builder, we already have a second meter in the house and will probably be able to negotiate an even cheaper tariff.
€uro schrieb:
This suggests that the entire heat load calculation is likely incorrect, which, by the way, is not uncommon. Related question: How can I find a good MEP engineer?
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