ᐅ Ground Source Heat Pump – What to Watch for When Reviewing a Quote (Single-Family Home, New Build, KfW 70 Standard)
Created on: 31 Jan 2014 08:21
L
Lacos
Hello everyone,
We are planning to build with a general contractor (single-family house, about 136 sqm (1463 sq ft), gable roof, ≤KFW70) and would like to enter the final negotiations with the last 2 or 3 points.
The construction descriptions each list ground source heat pumps (brand name + buffer tank), but without much detail. I would like to ask for your recommendations in this area.
Since brand names probably shouldn’t be mentioned here:
A brine-to-water ground source heat pump with a COP of 4.7 is specified (integrated domestic hot water tank of 185L (49 gallons)). Additionally, a buffer tank, probably between 200 - 300L (53 - 79 gallons), is planned.
1. Is this combination reasonable?
2. What should generally be considered with heat pumps? I definitely want to install a heat meter and a separate electricity meter. What else should be taken into account?
3. Which combination do you consider the most practical (e.g., size of the buffer tank, etc.) for a household of two people (both working, possibly one child in a few years)?
Thank you very much in advance,
Lacos
We are planning to build with a general contractor (single-family house, about 136 sqm (1463 sq ft), gable roof, ≤KFW70) and would like to enter the final negotiations with the last 2 or 3 points.
The construction descriptions each list ground source heat pumps (brand name + buffer tank), but without much detail. I would like to ask for your recommendations in this area.
Since brand names probably shouldn’t be mentioned here:
A brine-to-water ground source heat pump with a COP of 4.7 is specified (integrated domestic hot water tank of 185L (49 gallons)). Additionally, a buffer tank, probably between 200 - 300L (53 - 79 gallons), is planned.
1. Is this combination reasonable?
2. What should generally be considered with heat pumps? I definitely want to install a heat meter and a separate electricity meter. What else should be taken into account?
3. Which combination do you consider the most practical (e.g., size of the buffer tank, etc.) for a household of two people (both working, possibly one child in a few years)?
Thank you very much in advance,
Lacos
@Lacos: Have you had an energy consultation?
I can only share my current situation...
Over the weekend, I received several documents from my energy consultant, including his recommended system configuration:
Key Data:
Excerpt from Chapter 7.1 System Description:
Heating
Hot Water
Consumers:
I can only share my current situation...
Over the weekend, I received several documents from my energy consultant, including his recommended system configuration:
Key Data:
- KFW-70 house standard
- Building envelope area: 756.45 m² (8,140 sq ft)
- Building volume: 1,265.72 m³ (44,672 cu ft)
- Heated air volume: 961.95 m³ (33,963 cu ft)
- Usable floor area: 405.03 m² (4,360 sq ft)
- Surface-to-volume ratio (A/V): 0.60 1/m (0.18 1/ft)
- Window area: 49.26 m² (530 sq ft)
- Currently a two-person household, planning for up to five people in the future
Excerpt from Chapter 7.1 System Description:
Heating
- Generation: Central heat generation with ground-source (brine-to-water) heat pump (annual performance factor 4.4)
- Storage: 450-liter (119 gallon) buffer tank for underfloor heating
Hot Water
- Generation: Ground-source heat pump covering 41% of demand and solar domestic hot water heating covering 59%
- Bivalent storage tank: 750 liters (198 gallons)
Consumers:
- Kitchen sink
- Dishwasher
- 2 industrial sinks
- 3 toilets
- 4 washbasins
- 2 showers
- 1 bathtub
I was glad to have the initial energy consultation since otherwise, there is no reference point at all.
Additionally, I was able to coordinate with the shell construction company to check whether the building materials used are suitable for KfW 70 standard (overall). I can also provide the heating engineer with a document to guide them, as I was not familiar with the different specifications (see key data).
Who will be preparing the KfW application / energy certificate for you?
Additionally, I was able to coordinate with the shell construction company to check whether the building materials used are suitable for KfW 70 standard (overall). I can also provide the heating engineer with a document to guide them, as I was not familiar with the different specifications (see key data).
Who will be preparing the KfW application / energy certificate for you?
Hello everyone,
The energy performance certificate will be prepared by the general contractor – we want to build a turnkey house.
Thank you very much for all the many comments!
Regarding the heat pump, this one has now been selected. It includes an integrated 200-liter (53-gallon) storage tank, and according to the general contractor, no buffer tank will be used for the underfloor heating.
What is also interesting about this heat pump, besides a cooling function, is the touch control and operation via PC / iPhone app (the heat pump has a Wi-Fi module ^^).
Lacos
The energy performance certificate will be prepared by the general contractor – we want to build a turnkey house.
Thank you very much for all the many comments!
Regarding the heat pump, this one has now been selected. It includes an integrated 200-liter (53-gallon) storage tank, and according to the general contractor, no buffer tank will be used for the underfloor heating.
What is also interesting about this heat pump, besides a cooling function, is the touch control and operation via PC / iPhone app (the heat pump has a Wi-Fi module ^^).
Lacos
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