ᐅ Solar for hot water and heating, or is photovoltaic better for electricity?
Created on: 4 Feb 2018 18:46
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Pädda
Hello.
Our house will be heated with gas. To just meet the energy-saving regulations, we now need to decide soon whether to install a solar thermal system on the roof for hot water and heating support, or if it would be better to install a photovoltaic system to generate electricity.
What is your opinion on this?
Our house will be heated with gas. To just meet the energy-saving regulations, we now need to decide soon whether to install a solar thermal system on the roof for hot water and heating support, or if it would be better to install a photovoltaic system to generate electricity.
What is your opinion on this?
B
Baumfachmann4 Feb 2018 23:12If the insulation is adequate, then gas with controlled mechanical ventilation
Low maintenance costs and low gas consumption
For my 176m² (1894 ft²) house, insulation to passive house standard, 2 people, 400€ gas per year
Low maintenance costs and low gas consumption
For my 176m² (1894 ft²) house, insulation to passive house standard, 2 people, 400€ gas per year
It’s better to talk about your consumption in kWh. Also, that’s not very cheap. I pay 4.5 cents gross per kWh. For you, that would mean around 8,900 kWh and a heating load estimated at 4–5 kW at standard conditions.
At 4.5 cents plus the gas meter base fee and a reasonable €150 maintenance per year, you would be on par with a heat pump that has a seasonal performance factor of 4.
At 4.5 cents plus the gas meter base fee and a reasonable €150 maintenance per year, you would be on par with a heat pump that has a seasonal performance factor of 4.
Alex85 schrieb:
No. You use gas with controlled ventilation and have the calculation done to see if that is sufficient. If it is, you don’t do anything else (unless you really want to, for example because you like photovoltaic or solar thermal systems).What is the name of the calculation that needs to be done to check if gas with controlled ventilation is already sufficient? Should the general contractor carry out this calculation, or do I need to hire someone else?
Nordlys schrieb:
The general contractor (GC), or more specifically their thermal engineer, who always handles this for them.and here as well: investigate. question. Could this really be? Why? The verifications and calculations are not trivial, but they are logical and can be understood with some effort. We once dealt with such an engineer on a project (which was later canceled). He answered all questions with "I’m not exactly sure; I have to enter it like this into the software.".... :-(Best regards,
der Steph
Thank you very much for your support! This is how I will proceed.
If, in the end, solar thermal has to be installed on the roof, it will only be as large as necessary to comply with the energy-saving regulations. If such a small solar thermal system is installed, would it be better to use it to support the heating, for hot water, or for both? Are there any recommendations?
If, in the end, solar thermal has to be installed on the roof, it will only be as large as necessary to comply with the energy-saving regulations. If such a small solar thermal system is installed, would it be better to use it to support the heating, for hot water, or for both? Are there any recommendations?
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