Dear heat pump experts and experienced home builders,
I would like to better understand what heat pump capacity we actually need.
Our project:
2 full floors
No basement
148 sqm (1,593 sq ft)
KFW55 standard
In our energy demand calculation, a 6 kW air-to-water heat pump is recommended.
However, the heating load calculation in the plan specifies an 8 kW air-to-air heat pump.
Both calculations seem to follow a standard procedure, as this is a developer project.
Which figures in both documents should I focus on?
To me, 8 kW seems quite high, but this is just a feeling formed by reading here in the forum.
The underfloor heating is already installed, also standard, and the screed has been curing for 4 weeks, waiting for the system to be heated up.
But there is no heat pump installed yet.
The builder would credit us €15,000 if we handle the purchase and installation of the heat pump ourselves.
All these questions are overwhelming us.
Is this even possible? Can we choose a different model or manufacturer?
Is it worthwhile, is €15,000 a reasonable amount?
Is 6 kW enough? ...
We need solid information to stand our ground with the builder.
Help!
Thanks!
I would like to better understand what heat pump capacity we actually need.
Our project:
2 full floors
No basement
148 sqm (1,593 sq ft)
KFW55 standard
In our energy demand calculation, a 6 kW air-to-water heat pump is recommended.
However, the heating load calculation in the plan specifies an 8 kW air-to-air heat pump.
Both calculations seem to follow a standard procedure, as this is a developer project.
Which figures in both documents should I focus on?
To me, 8 kW seems quite high, but this is just a feeling formed by reading here in the forum.
The underfloor heating is already installed, also standard, and the screed has been curing for 4 weeks, waiting for the system to be heated up.
But there is no heat pump installed yet.
The builder would credit us €15,000 if we handle the purchase and installation of the heat pump ourselves.
All these questions are overwhelming us.
Is this even possible? Can we choose a different model or manufacturer?
Is it worthwhile, is €15,000 a reasonable amount?
Is 6 kW enough? ...
We need solid information to stand our ground with the builder.
Help!
Thanks!
D
danielohondo18 Nov 2022 08:51Our electricity price has increased from 28 cents to 39 cents per kWh. Gas has decreased from 16 cents to 15 cents per kWh.
Since construction has just started and we don’t have a heat pump yet, I am definitely willing to install a photovoltaic system, but the local solar installer hasn’t responded.
Since construction has just started and we don’t have a heat pump yet, I am definitely willing to install a photovoltaic system, but the local solar installer hasn’t responded.
junijulibaut schrieb:
Dear heat pump experts and experienced home builders,
I would like to better understand how much heat pump capacity we really need.
Our project:
2 full floors
No basement
148 sqm (1593 sq ft)
KFW55 standard
Our energy demand calculation recommends a 6 kW air-to-water heat pump.
However, the heating load calculation in the plan specifies an 8 kW air-to-air heat pump.
Both calculations follow standard procedures, as they come from the developer.
Which specifications in these documents should I focus on?
8 kW seems like a lot to me, but this is just an impression based on what I have learned from reading in this forum.
The underfloor heating is already installed, also standard design, the screed has been curing for 4 weeks and is ready for commissioning.
However, there is no heat pump yet.
The developer would credit us €15,000 if we arrange the heat pump and installation ourselves.
This raises many questions.
Is this even possible? Can we choose a different model or manufacturer?
Is it worth it, and is €15,000 a reasonable amount?
Will 6 kW be enough?.....
We need solid information to negotiate with the developer.
Help!
Thanks!Just go with the developer’s solution; it's better to have 2 kW too much than too little!
T
Torti2022neu24 Nov 2022 13:14Nutshell schrieb:
Just go for BT, better 2kW too much than too little!Factually incorrect. Heat pumps are usually undersized. Oversizing leads to efficiency losses and higher initial costs.D
Daniel-Sp24 Nov 2022 13:34... and not rarely causing increased material wear due to cycling
It can still be improved.
During a conversation with the construction management today, it came up that an 11 kW Daikin was ordered.
148 m² (1593 sq ft)
2 full stories
KfW55 standard
I am baffled.
The heating load calculation shows, for the AT reference location at -12°C (10°F), a standard heating load of 5115 W,
and the normative heating load (including warm-up allowance) is given as 6233 W.
How do you arrive at 11 kW from that?
I can’t make sense of it after studying the document.
That can’t be correct. I have no expertise in the matter, but my gut feeling screams NO!
Would it make sense to share the document here?
An engineering firm for heating load calculations is always recommended here. Which one was it again?
I am considering commissioning a calculation and then purchasing the appropriate heat pump myself.
Who knows when the 11 kW system will arrive, since it was only ordered in May 2022, and the heating load calculation is from February 2022.
Thanks
wp.seeker
on the next karma level
During a conversation with the construction management today, it came up that an 11 kW Daikin was ordered.
148 m² (1593 sq ft)
2 full stories
KfW55 standard
I am baffled.
The heating load calculation shows, for the AT reference location at -12°C (10°F), a standard heating load of 5115 W,
and the normative heating load (including warm-up allowance) is given as 6233 W.
How do you arrive at 11 kW from that?
I can’t make sense of it after studying the document.
That can’t be correct. I have no expertise in the matter, but my gut feeling screams NO!
Would it make sense to share the document here?
An engineering firm for heating load calculations is always recommended here. Which one was it again?
I am considering commissioning a calculation and then purchasing the appropriate heat pump myself.
Who knows when the 11 kW system will arrive, since it was only ordered in May 2022, and the heating load calculation is from February 2022.
Thanks
wp.seeker
on the next karma level
SaniererNRW123 schrieb:
You can also calculate your heating load using a different tool. Try googling "trench collector heat pump consumption database energy saving ordinance heating load." It comes very close to a detailed calculation (it’s from a group of DIY enthusiasts). I gave it a try, and here’s what I got:
I already set it to 24°C (75°F), which is quite warm. We don’t actually need it that warm, more like the 21°C (70°F) group.
Wärmepumpe.seeker
at the next karma level
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