ᐅ Is the specification of the heat pump the responsibility of the property owner?
Created on: 25 Sep 2010 01:38
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Faktus2010F
Faktus201025 Sep 2010 01:38Hello, we want to build with a contractor. The fine print regarding the heating system states:
"...the specified heat pump is adequately sized for heating. The exact requirements are determined by the heat demand calculation. It may become necessary to use a more powerful heat pump. Any additional costs will be borne by the client."
Is this legally acceptable?! I am paying a fixed amount for a heat pump and don’t even know if it is properly sized. Isn’t it the contractor’s responsibility to ensure this? 😡
Also, regarding wall brackets and fastening (wall openings and electrical connections to be provided by the client) – is this normal?
"...the specified heat pump is adequately sized for heating. The exact requirements are determined by the heat demand calculation. It may become necessary to use a more powerful heat pump. Any additional costs will be borne by the client."
Is this legally acceptable?! I am paying a fixed amount for a heat pump and don’t even know if it is properly sized. Isn’t it the contractor’s responsibility to ensure this? 😡
Also, regarding wall brackets and fastening (wall openings and electrical connections to be provided by the client) – is this normal?
Hello,
If a higher capacity is actually needed??, the more powerful heat generator must always be paid for by the builder. The question is whether the calculations are accurate enough. Usually it’s just estimated and guessed (back-of-the-envelope calculation plus safety margin).
Good luck with this building services technology!
I can only recommend having the heating load, heating surfaces, and piping system calculated externally, as well as sizing the heat generator independently, and then providing those parameters to the general contractor!
Best regards,
Using the above approach leads to making money with additional claims/modifications. In the end, the project might be more expensive than a comparable one!
Faktus2010 schrieb:Apparently, they don’t really know what this means :o
Hello, we want to build with a general contractor. The fine print for the heating system states:
"...the specified heat pump is sufficiently sized for heating purposes.The exact demand calculation is based on the heating load calculation.
Faktus2010 schrieb:They’re just messing around with this. It almost certainly won’t be energy efficient!
..There may be a need for a more powerful heat pump. The additional costs will be borne by the client."
Faktus2010 schrieb:
..Is this legal?! I pay a lump sum for a heat pump and don’t even know if it’s sized properly. Isn’t it the contractor’s responsibility to ensure this?! 😡
If a higher capacity is actually needed??, the more powerful heat generator must always be paid for by the builder. The question is whether the calculations are accurate enough. Usually it’s just estimated and guessed (back-of-the-envelope calculation plus safety margin).
Good luck with this building services technology!
I can only recommend having the heating load, heating surfaces, and piping system calculated externally, as well as sizing the heat generator independently, and then providing those parameters to the general contractor!
Best regards,
Using the above approach leads to making money with additional claims/modifications. In the end, the project might be more expensive than a comparable one!
F
Faktus201028 Sep 2010 00:09They clearly don’t really understand what is meant :o
So, something is just being tinkered with. It is very unlikely to be energy-efficient!
If a higher capacity is actually needed??? The more powerful heat generator must always be paid for by the builder. The question is whether this has been calculated accurately enough. Usually, it’s just estimated and guessed (rule of thumb based on window cross area plus safety margin).
Good luck with this building services system!
I can only recommend having the heating load, heating surfaces, and pipe network calculated externally, and also having the heat generator sized externally, then providing those parameters to the general contractor!
Best regards
Following the above procedure, money is earned through change orders/extensions. In the end, the project could actually be more expensive than a comparable one![/QUOTE]
Thank you for the detailed answer. What exactly is meant by pipe network and heat generator (heat unit)?
"Something is just being tinkered with"
That is absolutely true because we initially decided on a 160 m² (1,722 sq ft) house with a staggered floor and have now switched to two floors with 150 m² (1,615 sq ft). Both have the same heat pump.
So, something is just being tinkered with. It is very unlikely to be energy-efficient!
If a higher capacity is actually needed??? The more powerful heat generator must always be paid for by the builder. The question is whether this has been calculated accurately enough. Usually, it’s just estimated and guessed (rule of thumb based on window cross area plus safety margin).
Good luck with this building services system!
I can only recommend having the heating load, heating surfaces, and pipe network calculated externally, and also having the heat generator sized externally, then providing those parameters to the general contractor!
Best regards
Following the above procedure, money is earned through change orders/extensions. In the end, the project could actually be more expensive than a comparable one![/QUOTE]
Thank you for the detailed answer. What exactly is meant by pipe network and heat generator (heat unit)?
"Something is just being tinkered with"
That is absolutely true because we initially decided on a 160 m² (1,722 sq ft) house with a staggered floor and have now switched to two floors with 150 m² (1,615 sq ft). Both have the same heat pump.
Hello,
The pipe network is the complete system that transports the heating water to the heating surfaces. While the mass flow rates result from the heating load or surface calculations, the pressure losses are determined during the pipe network calculation. Only then can components such as pumps and others be selected.
WE => heat generator
That already indicates a rather superficial approach.
Main contractors or general contractors usually have their own “house brand.” This is then “fiddled in” regardless of whether it is truly optimal.
Getting the building warm later on is not necessarily the biggest challenge. The issue is the actual energy efficiency.
Modern technology is expensive and offers many possibilities, but these potentials can only be realized with precise planning. Over an expected service life of about 25 years, lacking energy efficiency will significantly affect your finances.
Best regards
Faktus2010 schrieb:
.... What exactly is meant by pipe network and WE (heat unit)?
The pipe network is the complete system that transports the heating water to the heating surfaces. While the mass flow rates result from the heating load or surface calculations, the pressure losses are determined during the pipe network calculation. Only then can components such as pumps and others be selected.
WE => heat generator
Faktus2010 schrieb:
..."Something is fiddled in there"
that is absolutely correct because we initially decided on a 160 m² (1722 ft²) house with a mezzanine and have now switched to 2 floors with 150 m² (1615 ft²). Both have the same heat pump.
That already indicates a rather superficial approach.
Main contractors or general contractors usually have their own “house brand.” This is then “fiddled in” regardless of whether it is truly optimal.
Getting the building warm later on is not necessarily the biggest challenge. The issue is the actual energy efficiency.
Modern technology is expensive and offers many possibilities, but these potentials can only be realized with precise planning. Over an expected service life of about 25 years, lacking energy efficiency will significantly affect your finances.
Best regards
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