ᐅ Which type of heat pump is most suitable for our new construction?

TripleB schrieb:
..How do I carry out a preliminary assessment, or what details does it include? Or is this done by an energy consultant?

This is done by a building services engineer (TGA planner). This includes calculating the actual demand (capacity, energy) for heating, hot water, and, if applicable, ventilation. Heating load is included. It also determines the expected consumption.

Many prospective homeowners mistakenly believe that the final energy consumption listed in the Energy Saving Ordinance/KfW certificate represents the actual consumption. This is not the case!

TripleB schrieb:
...Unfortunately, I don’t have one. Who can prepare this for me and what does it cost?

If needed, feel free to send me a private message or a direct email.

TripleB schrieb:
..., or who can best advise us. Is there a recommendation here?

See above. At the very least, it should be someone with appropriate professional qualifications who is not involved in sales or installation, to simply avoid conflicts of interest.

TripleB schrieb:
...I read that consumer advice centers also offer energy consultations for 5 euros – is that any good, or does it help us make a decision?

For a rough general overview, that might be useful. However, that stage has already been exceeded here, since specific parameters for the particular construction project need to be determined.

Best regards

Hello,

TripleB schrieb:

Basically, the question seems to be how we should approach this best, or who can advise us most effectively. Is there a recommendation? I read that consumer advice centers also offer energy consultations for 5 euros – is that worthwhile, or does it help us make a decision?

In my experience, you can skip the latter – and as €uro correctly pointed out, you are already too far along for that.

Try contacting your local energy agency; Google will show you the way. I have had excellent experiences with them; they provide unbiased information.

Regards,
Bauexperte

Hello everyone,

After having to focus on other topics over the past few weeks, I recently commissioned a heating load calculation from an independent HVAC planner according to DIN 12831. However, I have changed my mind about one thing. Basements 1 and 2 will not have underfloor heating and therefore will remain unheated.

To be honest, the heating load calculation doesn’t really help me decide whether it’s best to use an air source heat pump, a ground source heat pump, or something else. So I am hoping for more advice from you based on this information.

In general, is the heating system’s capacity sized exactly to the calculated building heating load, or is it recommended to include a margin for safety? If so, how much would you suggest?

Thank you in advance for your support!

Best regards,
TripleB

Hello,

TripleB schrieb:
Hello everyone,
After having to focus on other topics in recent weeks, I recently commissioned a heating load calculation by an independent building services engineer, according to DIN 12831.

The creator might be independent, but is it really a building services engineer? ;-) I am quite familiar with this printout by now ;-)
The heating load calculation is formally incorrect!!! Consequently, everything that follows from it is affected! Whether there might still be "leftovers" concerning the component geometry "in the basement" cannot be assessed this way. Who prepared the air volume plan according to DIN 1946-6 for this?

TripleB schrieb:
....To be honest, the heating load calculation does not really help me decide whether I should use an air-source heat pump, a ground-source heat pump, or something else, so I hope for more advice from you based on this information 🙂

No one can reliably answer that, since, for example, the actual energy demand for heating and hot water is unknown. With high demand, a ground-source heat pump might be interesting; with low demand, an air-source heat pump could be preferable. For ground-source heat pumps, the design of the source, and for air-source heat pumps, the evaluation of performance curves in relation to regional climate conditions, play a crucial role if you are aiming for an economical solution.
The tendency is as follows:
With low to moderate insulation standards and cool to moderate outside temperature patterns, usually a ground-source heat pump is preferred.
With moderate to very good insulation standards and moderate to mild outside temperature patterns, an air-source heat pump is usually recommended.
The boundaries between these are fluid.

TripleB schrieb:
...Generally speaking, is the heating output precisely sized according to the calculated building heating load, or is it advisable to include a buffer? If so, how large would that be?

If the heating load calculation is correct, the heat generator is sized accordingly, as this is its intended purpose! 🙂
Buffers (performance add-ons) tend to do more harm than good.
The benefits of comprehensive planning and dimensioning can be seen here:

However, this does not come cheap.

Best regards

€uro schrieb:
The HLB is formally incorrect!!! Accordingly, everything that follows from it!

Why is the HLB formally incorrect? It would be helpful to receive explanations or more detailed information on this. What about the design of the underfloor heating— is that also incorrect?

€uro schrieb:
Whether there might still be “skeletons” regarding the component geometry “in the basement,” cannot be assessed like this.

What exactly does that mean? I don’t understand...

What should I do now about this matter—discard it, ask for a refund/write it off? Is the component completely unusable? A heating engineer came up with similar, slightly higher values concerning the HLB...

Best regards
TripleB

TripleB schrieb:
Why is the heating load calculation (HLB) formally incorrect? It would be helpful to receive explanations or more detailed information on this.

Why do I have to provide a justification for this? Where is the airflow plan according to 1946-6 standard? You should contact the person responsible for this faulty work, who was compensated for it.

TripleB schrieb:
...What about the design of the underfloor heating, is that also incorrect?..

That should be quite obvious, because if the room heating loads are wrong, then the underfloor heating system design based on those loads is also incorrect. The subsequent hydraulics (pipe network calculation) built on this will be wrong as well!

TripleB schrieb:
...What should I do now – discard it, ask for a refund/write it off? Is the whole thing unusable? A heating engineer came up with similar but slightly higher values regarding the HLB...

Pure guesswork!

Best regards.