ᐅ Actual Energy Consumption versus Energy Performance Calculation
Created on: 2 Feb 2016 21:56
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ehrlichGood evening,
Starting in March, I will be constructing a bungalow according to the KfW70 energy savings standard from 2014. At the moment, I am considering whether to equip my heating system with solar thermal support or not. My energy performance certificate shows a primary energy demand of 41 kWh/a per m² (13 kWh/a per ft²). I will be installing a gas heating system.
My question is: How much does this figure typically differ from the actual future consumption?
To calculate the payback period, I also need to know the real effect of solar thermal support on heating.
Perhaps there are experts here in the forum who can help me with my decision.
Thank you in advance.
Thomas
Starting in March, I will be constructing a bungalow according to the KfW70 energy savings standard from 2014. At the moment, I am considering whether to equip my heating system with solar thermal support or not. My energy performance certificate shows a primary energy demand of 41 kWh/a per m² (13 kWh/a per ft²). I will be installing a gas heating system.
My question is: How much does this figure typically differ from the actual future consumption?
To calculate the payback period, I also need to know the real effect of solar thermal support on heating.
Perhaps there are experts here in the forum who can help me with my decision.
Thank you in advance.
Thomas
This can only be guessed since the 41 kWh/m² (square meter) exactly corresponds to the KfW70 energy saving regulation calculation from 2014 (there is actually no funding for KfW70 anymore, does this standard even still exist – or are only the ht qp values still relevant?).
So, basically, we only have one piece of information from you, and the actual energy consumption can only be estimated. We actually know nothing about your bungalow, the surroundings, the climate conditions, or how much solar support you are planning.
Since we don’t have a working crystal ball, we can only guess.
Generally, heating costs are so low according to current energy standards that nothing really “pays off” (you won’t get any money back anyway), and it will be difficult to save on the initial investment as well. If you save 10% on heating costs, you will simply pay about 5€ less per month.
So, basically, we only have one piece of information from you, and the actual energy consumption can only be estimated. We actually know nothing about your bungalow, the surroundings, the climate conditions, or how much solar support you are planning.
Since we don’t have a working crystal ball, we can only guess.
Generally, heating costs are so low according to current energy standards that nothing really “pays off” (you won’t get any money back anyway), and it will be difficult to save on the initial investment as well. If you save 10% on heating costs, you will simply pay about 5€ less per month.
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nightdancer3 Feb 2016 14:54ehrlich schrieb:
Good evening,
Starting in March, I will be building a bungalow according to the KfW70 energy saving standard 2014. Currently, I am wondering whether to equip my heating system with solar heating support or not. How far off is this figure from the actual future consumption?
What does the heat load calculation according to DIN 12831 say?!
That is exactly why I asked for more information. For homeowners, the important factors for comparison are not the energy saving regulation class, but rather the building shape, location (the Alps simply have a different climate than the North Sea!), construction method, and so on.
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