ᐅ Combination of air-to-water heat pump + solar thermal system + stove, or stove and air-to-water heat pump only
Created on: 2 Feb 2016 22:33
N
Newbie123
Hello forum,
I am currently planning the construction of a new KfW40 single-family house.
The expert’s calculation resulted in the following (summary):
Heated building volume = 532 cubic meters
Usable floor area = 170 square meters
Qp-new building = 29 kWh/(sqm per year)
The construction company’s offer includes the following technology
(where KfW was only calculated with the heat pump):
Novelan heat pump LAD 5 (air-to-water heat pump)
Compact Station Dual 180-liter (47-gallon) domestic hot water tank
+
optional solar thermal system
SPE1 with 2 Roth collectors (2 x 2.52 sqm (27 sq ft))
including a 400-liter (106-gallon) water tank.
If the solar thermal system is installed, the 180-liter (47-gallon) heat pump tank would likely be removed.
I am generally aware that both systems are rather designed for the summer months and show weaknesses in winter, but nevertheless, the extra cost for the solar system (€4,800) seems reasonable to me for ideological reasons… purely from a financial standpoint, it will probably never really pay off.
For the winter months, I am considering connecting the planned wood stove with water heat exchanger to the central water storage tank. For this purpose, something like a Novelan/Alpha Innotec MFS 600-liter (158-gallon) multifunctional storage tank would probably be necessary.
What do you think, is this all nonsense or somewhat justifiable?
Or just take the heat pump with a small water tank plus a regular stove for the living room (which is already planned, as mentioned)?
I am currently planning the construction of a new KfW40 single-family house.
The expert’s calculation resulted in the following (summary):
Heated building volume = 532 cubic meters
Usable floor area = 170 square meters
Qp-new building = 29 kWh/(sqm per year)
The construction company’s offer includes the following technology
(where KfW was only calculated with the heat pump):
Novelan heat pump LAD 5 (air-to-water heat pump)
Compact Station Dual 180-liter (47-gallon) domestic hot water tank
+
optional solar thermal system
SPE1 with 2 Roth collectors (2 x 2.52 sqm (27 sq ft))
including a 400-liter (106-gallon) water tank.
If the solar thermal system is installed, the 180-liter (47-gallon) heat pump tank would likely be removed.
I am generally aware that both systems are rather designed for the summer months and show weaknesses in winter, but nevertheless, the extra cost for the solar system (€4,800) seems reasonable to me for ideological reasons… purely from a financial standpoint, it will probably never really pay off.
For the winter months, I am considering connecting the planned wood stove with water heat exchanger to the central water storage tank. For this purpose, something like a Novelan/Alpha Innotec MFS 600-liter (158-gallon) multifunctional storage tank would probably be necessary.
What do you think, is this all nonsense or somewhat justifiable?
Or just take the heat pump with a small water tank plus a regular stove for the living room (which is already planned, as mentioned)?
N
Newbie1237 Feb 2016 12:34wrobel schrieb:
Hello,
Since the hydronic stove operates with a return temperature boost, it cannot be connected directly to the heating circuit. You will need a buffer tank that can also handle domestic hot water production.
OlliFor this purpose, for example, the MFS 600L multifunction storage tank from Novelan/Alpha Innotec is designed.
However, I am not yet sure if the size of the tank is determined solely based on the estimated water consumption of a family of four, or if there are other dependencies or conditions involved.
Hello again
Yes, something like that would work.
As a rough estimate, you can assume 55 liters (about 15 gallons) of buffer volume per kW of heating capacity of the biomass boiler.
If the heat pump also uses the buffer, it should be somewhat larger.
A bigger storage tank only costs slightly more money and space.
I am currently installing a 1500-liter (about 400 gallons) sanitary storage tank, 20 m² (215 sq ft) collector area, and a 10 kW pellet stove without a heat pump or gas condensing boiler.
Olli
Yes, something like that would work.
As a rough estimate, you can assume 55 liters (about 15 gallons) of buffer volume per kW of heating capacity of the biomass boiler.
If the heat pump also uses the buffer, it should be somewhat larger.
A bigger storage tank only costs slightly more money and space.
I am currently installing a 1500-liter (about 400 gallons) sanitary storage tank, 20 m² (215 sq ft) collector area, and a 10 kW pellet stove without a heat pump or gas condensing boiler.
Olli
Similar topics