ᐅ Energy Saving Regulation 2016 / KFW55 Standard / Gas and Solar in 2016

Created on: 1 Dec 2015 20:37

I have a question regarding the 2016 energy saving regulation. It is often stated that the transmission heat loss is reduced by 20 percent, but I cannot find this figure, unlike the change in primary energy demand, in the legal text. Instead, it says:

From January 1, 2016, the specific transmission heat loss related to the heat-transmitting building envelope of a new residential building must not exceed 1.0 times the corresponding value of the respective reference building.

Does this actually mean that these reference values have not applied before and only became valid from January 2016? Is the 20-percent tightening only implicit or calculated?

Furthermore, the KFW55 standard is based on these reference values concerning transmission heat loss. KFW55 corresponds to 70 percent, so is KFW55 about 30 percent stricter than the 2016 energy saving regulation regarding this parameter?

This is also suggested by the simplified benchmark values for KFW55, e.g., thermal bridge allowance 0.05 x 0.7 = 0.035 or 0.28 x 0.7 = 0.2. “Simplified” is relative, as you still have to calculate all thermal bridges.

Then the equation that KFW70 is roughly equivalent to the 2016 energy saving regulation is definitely not correct. KFW70 is at 85 percent of the reference values, while the 2016 energy saving regulation refers to 100 percent of the reference values. Therefore, KFW70 is still 15 percent stricter regarding transmission heat loss than the new energy saving regulation. Only in comparison of primary energy are the values closer, where KFW70 demands 70 percent and the energy saving regulation a tightening by 25 percent, so 75 percent.

This brings us to gas plus solar in 2016. A KFW70 house exceeds both primary energy demand and transmission heat loss requirements of the 2016 energy saving regulation. If there were KFW70 houses with gas plus solar before, there will continue to be. The requirements of the Renewable Energies Heat Act are met by the system under point I. 1.) a) aa).

Any opinions? Corrections? Counterarguments? Theories? Other comments?

merlin8316 May 2016 10:25

#19

How is the situation with government subsidies for solar thermal systems? There are substantial grants for existing buildings, but not for new constructions. Where is the limit or restriction here? Would it be possible to receive subsidies for an installation shortly after moving in?

ares8316 May 2016 10:43

#20

The BAFA processing time is 2 years.

Goldi0911116 May 2016 13:06

#21

Does it actually make sense to include a buffer tank for the gas condensing boiler if we can build without solar panels, or is that unnecessary?

T2115016 May 2016 14:17

#22

Goldi09111 schrieb:
Does it actually make sense to plan a buffer tank for the gas condensing boiler if we build without solar, or is that pointless?

That makes sense. Otherwise, you would need a gas condensing boiler with an instantaneous water heater for domestic hot water. Without solar, the buffer tank can be smaller than with thermal solar.

I would recommend a buffer tank sized according to the household’s consumption. 150 liters (40 gallons) is quite small. 200 liters (53 gallons) should definitely be sufficient.

In any case, you won’t need a 300 or 400 liter (79 or 106 gallons) stratified storage tank without thermal solar.

You will have some standby heat losses of about 1.5 – 1.8 kWh per day, but the efficiency of the gas instantaneous heating variant is not great either…

Best regards,
Thorsten

Goldi0911118 May 2016 20:53

#23

Thank you for the information.

Geminie9 Jan 2017 14:19

#24

Hello Goldi09111,
I would like to hear how your house construction turned out. Were you able to build using only a gas heating system combined with a ventilation system?

ᐅ Energy Saving Regulation 2016 / KFW55 Standard / Gas and Solar in 2016

Reaktionen