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
T
T_im_Norden5 Nov 2020 19:48He’s not interested in spending several thousand euros... Seriously.
Who is the client, you or the general contractor?
Who is the client, you or the general contractor?
Hmm...
The heating engineer just informed me that he will not be carrying out the project. I haven’t spoken to the general contractor yet, but does anyone know a reliable heating engineer in the Berlin area?
Someone who handles requests professionally and doesn’t quit out of wounded pride?
The heating engineer just informed me that he will not be carrying out the project. I haven’t spoken to the general contractor yet, but does anyone know a reliable heating engineer in the Berlin area?
Someone who handles requests professionally and doesn’t quit out of wounded pride?
Just for your information here as well: The general contractor is trying once more to talk with the heating specialist but doesn’t expect much. He doesn’t have another heating or plumbing professional available and will probably credit me for this trade so I can find my own contractor.
So, I’ve had the conversation with the general contractor (GC). I left with mixed feelings.
On one hand, he gave me a fairly plausible explanation for why, from his perspective, I should search on my own. He believes a private individual has better chances of finding a plumbing company that will actually carry out the work. Not necessarily due to capacity issues, but because a plumbing company carefully considers entering a new business relationship with a GC they don’t know yet. There are fewer questions raised when dealing directly with a private person.
However, he also promised to continue looking for alternatives himself.
He also mentioned that he has worked with this subcontractor for years, if not decades, and has never encountered a case like this. He can’t really explain why the subcontractor lost interest now (the email exchange is available to him). He suspects that I cornered the plumber with very detailed questions and requirements, and since the GC knows the plumber to be somewhat impulsive, the subcontractor probably just gave up too quickly. Nevertheless, even in a direct conversation with him, the answer regarding execution of my construction project was a firm “No.”
However, the GC thinks I might still be able to convince him.
Regarding a credit, the GC assured me that he will fully reimburse the plumber’s costs to him. I actually believe that. But he is not offering me any share of his margin for this trade based on the overall costs.
At the moment, I am still waiting for offers from alternative plumbers. I have now contacted eight companies. Two have declined, one due to lack of capacity until 2021, the other because my requirements were too demanding. Two have at least expressed interest but have not yet had time to prepare an offer (which is something).
For now, I will wait and continue to look for other ways to get in touch with good companies.
On one hand, he gave me a fairly plausible explanation for why, from his perspective, I should search on my own. He believes a private individual has better chances of finding a plumbing company that will actually carry out the work. Not necessarily due to capacity issues, but because a plumbing company carefully considers entering a new business relationship with a GC they don’t know yet. There are fewer questions raised when dealing directly with a private person.
However, he also promised to continue looking for alternatives himself.
He also mentioned that he has worked with this subcontractor for years, if not decades, and has never encountered a case like this. He can’t really explain why the subcontractor lost interest now (the email exchange is available to him). He suspects that I cornered the plumber with very detailed questions and requirements, and since the GC knows the plumber to be somewhat impulsive, the subcontractor probably just gave up too quickly. Nevertheless, even in a direct conversation with him, the answer regarding execution of my construction project was a firm “No.”
However, the GC thinks I might still be able to convince him.
Regarding a credit, the GC assured me that he will fully reimburse the plumber’s costs to him. I actually believe that. But he is not offering me any share of his margin for this trade based on the overall costs.
At the moment, I am still waiting for offers from alternative plumbers. I have now contacted eight companies. Two have declined, one due to lack of capacity until 2021, the other because my requirements were too demanding. Two have at least expressed interest but have not yet had time to prepare an offer (which is something).
For now, I will wait and continue to look for other ways to get in touch with good companies.
Yes, I am currently wavering between resignation and determination (periods when I search for addresses and check websites to see if they might be suitable). Many thanks also for your tips @Mycraft, but unfortunately, none have responded so far. The workload is just too high at the moment. I will follow up again...
