Cooling concept new building - split air conditioning / air-to-water heat pump cooling function / combination

  • Erstellt am 2021-06-20 11:49:35

Samantheus

2021-06-20 11:49:35
  • #1
Hello everyone,

I am currently planning the construction of a single-family house and am still undecided regarding the cooling concept. I have attached the current floor plan. Regarding the floor plans, I also have a thread in the floor plan planning forum ( ).

It is a KFW 55 new building (Poroton brick, reinforced concrete ceiling) with an air-to-water heat pump, controlled residential ventilation, and roller shutters/blinds on all windows. The garden side with the large windows faces southwest, the entrance side faces northeast. The office on the garden side must definitely be air-conditioned as it is in constant use with many technical devices that generate a lot of heat. Otherwise, by nature, I am someone who likes it very cool, vacationing in Scandinavia but definitely not in Greece, Egypt, or such. In other words, the comfortable temperature is considerably lower than for most other people.

Now I am considering how best to cool the house (apart from shading, etc.).

Option 1:
Split air conditioning in the office

Option 2:
Split air conditioning in the office + cooling function of the air-to-water heat pump (approx. 5k EUR additional cost)

Option 3:
Split air conditioning in the office + living/dining/kitchen area

Option 4:
Split air conditioning in the office + living/dining/kitchen area + upstairs hallway (but this probably only works above the stairs, supply temperature. not ideal because cool air then sinks directly to the ground floor?)

Option 5:
Split air conditioning in the office + living/dining/kitchen area + child + child + sleeping

Furthermore, I am wondering how big the difference is whether you do it right away as part of the new construction or retrofit it later (significantly more expensive if you do it later? Potential problems with KfW 55?).

Regarding the question of whether to take a split device per room or the multi-split option, I am also still unsure. Currently, I do not have any concrete offers with prices available.

Thank you in advance!

Best regards
Sam

View:
[ATTACH alt="kuehlkonzept-neubau-splitklima-lwwp-kuehlfunktion-kombination-505519-3.png" type="full"]62766[/ATTACH][ATTACH alt="kuehlkonzept-neubau-splitklima-lwwp-kuehlfunktion-kombination-505519-1.png" type="full"]62764[/ATTACH]

Floor plan:
[ATTACH alt="kuehlkonzept-neubau-splitklima-lwwp-kuehlfunktion-kombination-505519-5.png" type="full"]62768[/ATTACH][ATTACH alt="kuehlkonzept-neubau-splitklima-lwwp-kuehlfunktion-kombination-505519-2.png" type="full"]62765[/ATTACH][ATTACH alt="kuehlkonzept-neubau-splitklima-lwwp-kuehlfunktion-kombination-505519-4.png" type="full"]62767[/ATTACH]
 

Mycraft

2021-06-20 11:56:27
  • #2
Due to your specifications, you need variant 5.

Multisplit would be the system of choice, preferably VRV, then you can design everything as you wish. However, it is not cheap. An installation during new construction is more convenient and also cheaper in terms of appearance afterwards because you can hide everything.

Later on, you will have to make compromises regarding the necessary wiring, for better or worse. Also, 5 outdoor units on the house look bad.

The cool air from the upper floor naturally sinks down to the ground floor, but it doesn't stop there. Because there is also warm air on the upper floor. It just takes a bit longer, but eventually, an equilibrium is established throughout the whole house. Because warm air always rises up to exactly your system.
 

Samantheus

2021-06-20 14:27:33
  • #3
Thank you very much for the quick response.

Can you roughly estimate what price range that would be? If it is completely unreasonable, I would first opt for a cheaper solution and see how the heat development is.
 

JoachimG.

2021-06-20 14:57:14
  • #4
I had a cooling system offered for our new building. Cooled area would be about 150 sqm - 5 indoor units as wall units - 1 outdoor unit. Completely from Daikin - 14 kilos. Duct units (to hide them in the suspended ceiling) - 21 kilos.
 

Mycraft

2021-06-20 15:05:37
  • #5
You can't really say. It also depends on the local companies and what they offer and their prices.

Depending on the manufacturer, you are looking at 3, 4, or 5 multisplits for 3.5 - 6 thousand plus installation. I would estimate about 10K for the complete solution + installation (calculated very, very tightly).

Single singlesplits are of course much cheaper, as you are already looking at 500 per room, but then you have an outdoor unit for each device. You have to make many compromises, and in the end, it doesn’t necessarily look nice. Also, extensions of the lines may be necessary, and the price for that could easily exceed the price of the system.
 

Strahleman

2021-06-20 18:35:52
  • #6
At least for the Nuremberg area, you have estimated quite well. With us, 4 indoor units + an 8.3kW multi-split outdoor unit cost almost 10k euros and the installation about 6k euros (new build). If you are considering an air conditioning system, I would have it pre-installed directly in the new build. The refrigerant lines as well as condensate drains can be laid quite neatly under plaster and especially you can still respond individually to problems and usually solve them quite easily. That is not necessarily possible with an existing house anymore.
 

Similar topics
19.01.2013KfW 70 - which roller shutters in the new city villa?10
06.02.2017Insulate new construction 36.5 aerated concrete?60
05.08.2014New single-family house (KFW70)/aerated concrete vs. sand-lime brick/what to use?71
17.02.2015KFW funding sensible / Energy advisor, construction supervision?10
19.06.2015Build according to KFW 70 or the Energy Saving Ordinance 201442
31.12.2015Preparing electrical work for a smart home new construction17
28.02.2016Buy a house, renovate or build new?41
08.05.2016Renovation & Attic Expansion: KfW? Cost-effectiveness vs. New Construction?18
10.05.2016KfW funding for two-family house26
30.12.2017Heating system new construction (heat pump + stove + solar)35
25.09.2018New construction - assessment of energy efficiency15
25.02.2020Financing option - Assessment - New construction21
10.07.2020KfW - construction: is it necessary or not?99
15.09.2020New single-family house or core renovation of a house built in 197839
29.01.2021Is the 2014 Energy Saving Ordinance a KfW standard?24
11.01.2021Bungalow expansion to single-family house - costs, KfW funding & planning12
20.06.2021KfW Program 440 - Charging Stations for Electric Cars - Wallbox26
03.03.2021Purchase single-family house new build energy saving regulation standard prospectively sufficient?24
08.07.2021Installing air conditioning --> KFW funding gone?82
24.07.2021Disconnection of pipes before demolition -> Costs/Experience?15

Oben