ᐅ Heating Load Calculation & Installation Plan According to DIN: Is a New Calculation Required?
Created on: 2 Nov 2020 11:15
T
Tolentino
Hello dear forum members,
Today I emailed my heating technician with my desired temperatures for each room. Unfortunately, he replied very quickly with a calculation and pipe layout plans that were simply done according to DIN standards. Since the structural engineer has not calculated anything yet, I am quite sure that no solar gains were included in the calculation. In any case, the total calculated heating load seems relatively high to me. What do you think?
I also mentioned that I want a flow temperature of 30°C (86°F) and a maximum pipe spacing of 10 cm (4 inches). He replied as follows:
“Since you have individual room control here, the warmest room always counts as the design peak for the flow temperature. 30 degrees is possible. Also, a fixed spacing for the piping is not practical here, because this would unnecessarily increase the pump power due to flow rate throttling.”
We had actually agreed to deactivate the individual room control and only install it to comply with the energy saving regulations. I don’t know why he forgot this again. I also don’t quite understand the rest. Does anyone have experience with this and can comment? @Daniel-Sp, @T_im_Norden, for example? You are the experts...
Attached are the last page of the heating load calculation and the pipe layout plan. If you also need the detailed calculations for the individual rooms, I can send screenshots of those as well.
Do I need a new calculation? Is there any way to adjust the existing calculation to fit my requested parameters?
Thanks and regards
Tolentino
Today I emailed my heating technician with my desired temperatures for each room. Unfortunately, he replied very quickly with a calculation and pipe layout plans that were simply done according to DIN standards. Since the structural engineer has not calculated anything yet, I am quite sure that no solar gains were included in the calculation. In any case, the total calculated heating load seems relatively high to me. What do you think?
I also mentioned that I want a flow temperature of 30°C (86°F) and a maximum pipe spacing of 10 cm (4 inches). He replied as follows:
“Since you have individual room control here, the warmest room always counts as the design peak for the flow temperature. 30 degrees is possible. Also, a fixed spacing for the piping is not practical here, because this would unnecessarily increase the pump power due to flow rate throttling.”
We had actually agreed to deactivate the individual room control and only install it to comply with the energy saving regulations. I don’t know why he forgot this again. I also don’t quite understand the rest. Does anyone have experience with this and can comment? @Daniel-Sp, @T_im_Norden, for example? You are the experts...
Attached are the last page of the heating load calculation and the pipe layout plan. If you also need the detailed calculations for the individual rooms, I can send screenshots of those as well.
Do I need a new calculation? Is there any way to adjust the existing calculation to fit my requested parameters?
Thanks and regards
Tolentino
D
Daniel-Sp5 Nov 2020 16:29That should be included in the calculation.
Ah, FB (seems to refer to the floor) = 0.35 W/m²K. But it is only listed. Hmm.
Edit:
The heating specialist subtly implied that I’m crazy. So, basically, such a precise calculation is overkill for a single-family house and wouldn’t change the design or building services anyway.
I’ve now asked if he would accept a third-party plan. Let’s see...
Edit:
The heating specialist subtly implied that I’m crazy. So, basically, such a precise calculation is overkill for a single-family house and wouldn’t change the design or building services anyway.
I’ve now asked if he would accept a third-party plan. Let’s see...
T
T_im_Norden5 Nov 2020 16:51What more can be said about that…..
Yes. According to the engineering firm, the floor makes a significant difference.
Who ultimately pays the tradesperson (at least indirectly)? It’s still you. So you need to present a clear note and say: please do it this way. If the installation spacing in the bathroom increases from 5cm (2 inches) to 8cm (3 inches), that’s quite unfortunate. However, it at least ensures that the bathroom will not become the coldest room when using “good” supply temperatures.
Your heating technician doesn’t seem to be fully up to speed technically. Our energy consultant strongly emphasized in the homeowner’s annex that the heating load calculation must not be omitted.
I get the impression that the KFW world and the heating professionals’ world exist in different filter bubbles.
Who ultimately pays the tradesperson (at least indirectly)? It’s still you. So you need to present a clear note and say: please do it this way. If the installation spacing in the bathroom increases from 5cm (2 inches) to 8cm (3 inches), that’s quite unfortunate. However, it at least ensures that the bathroom will not become the coldest room when using “good” supply temperatures.
Your heating technician doesn’t seem to be fully up to speed technically. Our energy consultant strongly emphasized in the homeowner’s annex that the heating load calculation must not be omitted.
I get the impression that the KFW world and the heating professionals’ world exist in different filter bubbles.
I think the heating engineer just doesn’t want anyone interfering. He has been working with heat pumps for over 10 years and considers himself the expert. Then some demanding layperson with limited knowledge comes along and tells him how to do his job.
His design and execution will be sufficient for about 80% of people. I just want the last 20%, or at least 15%.
He’s not used to that. Unfortunately, when the contract was signed with the general contractor, I wasn’t as informed as I am now, otherwise I would have had this included in the contract. So this calculation is not even required (I’m only building according to the energy saving regulations / building code).
I’m hoping that it will be accepted with the external planning now.
He says that the way I want it calculated would cost several thousand euros... hehe.
His design and execution will be sufficient for about 80% of people. I just want the last 20%, or at least 15%.
He’s not used to that. Unfortunately, when the contract was signed with the general contractor, I wasn’t as informed as I am now, otherwise I would have had this included in the contract. So this calculation is not even required (I’m only building according to the energy saving regulations / building code).
I’m hoping that it will be accepted with the external planning now.
He says that the way I want it calculated would cost several thousand euros... hehe.