ᐅ Which heating system is best for a new build without a mechanical ventilation system?
Created on: 4 Oct 2016 10:44
A
Alpandian89
Hello everyone,
We are planning to build a single-family house (including a basement) next year with a living area of 150 sqm (1,615 sq ft). However, we do not want a ventilation system, and meeting KfW 55 standard is not mandatory.
The plan is to build with either 36.5 cm (14.4 inches) or 42.5 cm (16.7 inches) Poroton blocks. Triple-glazed windows and a stove in the living area are also planned. A gas connection and our own forest are available. One roof side faces southeast/northeast (gable roof with a 45° pitch).
Which heating concept would you recommend?
Please let us know if you need any further information.
Thank you in advance.
We are planning to build a single-family house (including a basement) next year with a living area of 150 sqm (1,615 sq ft). However, we do not want a ventilation system, and meeting KfW 55 standard is not mandatory.
The plan is to build with either 36.5 cm (14.4 inches) or 42.5 cm (16.7 inches) Poroton blocks. Triple-glazed windows and a stove in the living area are also planned. A gas connection and our own forest are available. One roof side faces southeast/northeast (gable roof with a 45° pitch).
Which heating concept would you recommend?
Please let us know if you need any further information.
Thank you in advance.
E
ErikErdgas10 Oct 2016 17:27Hello Alpandian89,
I would add your personal user behavior to the points mentioned. For example, it would be interesting to consider your hot water consumption. The higher the proportion of hot water to be produced, the more the efficiency of the heat pump decreases, which then favors the planned gas condensing boiler solution with solar thermal support. The roof orientation should be relatively well suited for this.
I definitely agree with the point about the ventilation system. Both for energy reasons (heat recovery) and hygiene (air quality, air exchange), this is especially attractive in new builds due to the relatively low costs.
Best regards, Erik
I would add your personal user behavior to the points mentioned. For example, it would be interesting to consider your hot water consumption. The higher the proportion of hot water to be produced, the more the efficiency of the heat pump decreases, which then favors the planned gas condensing boiler solution with solar thermal support. The roof orientation should be relatively well suited for this.
I definitely agree with the point about the ventilation system. Both for energy reasons (heat recovery) and hygiene (air quality, air exchange), this is especially attractive in new builds due to the relatively low costs.
Best regards, Erik
ErikErdgas schrieb:
I would add the aspect of your personal usage behavior to the points mentioned. It would certainly be interesting to consider, for example, your hot water consumption. The higher the amount of hot water to be produced, the more the efficiency of the heat pump drops, which then favors the planned gas condensing system with solar thermal support. The roof orientation should be quite well suited for this. Depending on the heat pump, the annual performance factor for hot water operation can even be better. For example, some units from ROTEX provide water via a hygienic storage system and thus only need to heat up to 45°C (113°F). In such cases, the more hot water you use, the better the annual performance factor. However, overall, the differences are marginal.
Also, natural gas heating systems cannot provide cooling, and eventually, you will have to switch (in 10, 20, or 30 years) because fossil fuels will no longer be politically acceptable.
M
mikiliki123211 Oct 2016 12:38To meet KFW55 according to the 2016 Energy Saving Ordinance, the following parameters must be met:
Roof surfaces, top floor ceiling, dormers U-value ≤ 0.14 W/m²K
Windows U-value ≤ 0.9 W/m²K
Masonry U-value ≤ 0.2 W/m²K (hard to achieve with unfilled Poroton at normal thickness)
Entrance door U-value ≤ 1.2 W/m²K
If using gas, you need controlled residential ventilation and solar:
Condensing boiler, solar domestic hot water system (standard values according to DIN V 4701-10), central ventilation system with heat recovery (heat recovery efficiency > 80%)
Roof surfaces, top floor ceiling, dormers U-value ≤ 0.14 W/m²K
Windows U-value ≤ 0.9 W/m²K
Masonry U-value ≤ 0.2 W/m²K (hard to achieve with unfilled Poroton at normal thickness)
Entrance door U-value ≤ 1.2 W/m²K
If using gas, you need controlled residential ventilation and solar:
Condensing boiler, solar domestic hot water system (standard values according to DIN V 4701-10), central ventilation system with heat recovery (heat recovery efficiency > 80%)
E
ErikErdgas13 Oct 2016 10:58Hello Grym,
Even at 45°C (113°F), the required temperature to be provided is certainly higher than the supply temperature for heat distribution via underfloor heating. Rotex offers a seasonal performance factor calculator on their website. For system temperatures of underfloor heating at 30°C / 23°C (86°F / 73°F), I get a difference in the stated Coefficient of Performance (COP) of about 0.3, and an absolute difference of nearly 0.9 between domestic hot water and heating water production when calculating hot water demand between 20% and 50%. Of course, this can be calculated for various examples going up or down, but I would generally expect to see differences.
I would counter the argument that fossil fuels, in the case of natural gas, will no longer play a role with the position of the Federal Ministry for Economic Affairs and Energy:
“Even in the coming decades, natural gas will continue to make a significant contribution to energy supply in Germany. By far the most important market for natural gas remains the heating market.”
Best regards, Erik
Even at 45°C (113°F), the required temperature to be provided is certainly higher than the supply temperature for heat distribution via underfloor heating. Rotex offers a seasonal performance factor calculator on their website. For system temperatures of underfloor heating at 30°C / 23°C (86°F / 73°F), I get a difference in the stated Coefficient of Performance (COP) of about 0.3, and an absolute difference of nearly 0.9 between domestic hot water and heating water production when calculating hot water demand between 20% and 50%. Of course, this can be calculated for various examples going up or down, but I would generally expect to see differences.
I would counter the argument that fossil fuels, in the case of natural gas, will no longer play a role with the position of the Federal Ministry for Economic Affairs and Energy:
“Even in the coming decades, natural gas will continue to make a significant contribution to energy supply in Germany. By far the most important market for natural gas remains the heating market.”
Best regards, Erik
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