ᐅ Solar Thermal for Domestic Hot Water and Additional Heating Support?
Created on: 8 Jun 2017 15:50
S
ShawN46
Hello everyone,
in our new house (existing property), a natural gas condensing boiler system is installed in combination with a solar thermal system (both were installed about 1.5 years ago).
Now I am wondering if it would be worthwhile to upgrade the solar thermal system to provide heating support as well?
A heating technician friend of mine said that especially in combination with underfloor heating (which we plan to install, as until now we have only had conventional radiators), adding heating support through solar thermal makes sense (mainly because of the relatively low flow temperature, of course). Another heating technician, however, believes that a solar thermal system should only be designed for domestic hot water, and anything beyond that would be a waste of money...
Therefore, I would be interested in your opinions or even better, your experiences regarding solar thermal for domestic hot water only, or for domestic hot water plus heating support!
Current setup: natural gas condensing boiler 17 kW, solar thermal flat plate collectors with 9.36 m² (101 sq ft), 800-liter (210-gallon) combined stratified storage tank.
Thanks in advance!
Best regards
in our new house (existing property), a natural gas condensing boiler system is installed in combination with a solar thermal system (both were installed about 1.5 years ago).
Now I am wondering if it would be worthwhile to upgrade the solar thermal system to provide heating support as well?
A heating technician friend of mine said that especially in combination with underfloor heating (which we plan to install, as until now we have only had conventional radiators), adding heating support through solar thermal makes sense (mainly because of the relatively low flow temperature, of course). Another heating technician, however, believes that a solar thermal system should only be designed for domestic hot water, and anything beyond that would be a waste of money...
Therefore, I would be interested in your opinions or even better, your experiences regarding solar thermal for domestic hot water only, or for domestic hot water plus heating support!
Current setup: natural gas condensing boiler 17 kW, solar thermal flat plate collectors with 9.36 m² (101 sq ft), 800-liter (210-gallon) combined stratified storage tank.
Thanks in advance!
Best regards
AOLNCM schrieb:
Just like other extras in the house. Ventilation system, fireplace (with heating support), ETICS insulation, KNX, batteries (accumulators).With the small difference that some extras are practical and at least have some kind of cost-benefit ratio, while others are pure money burners...
Heating support (underfloor heating, etc.) through solar thermal systems unfortunately belongs to the latter group...
Very interesting.
Everyone knows that it’s not worth it. No one asks him about the heated area or the previous year’s consumption.
For a 100m² (1,076 sq ft) house, I wouldn’t push it on anyone either. For a larger property, 10% might possibly become interesting under certain circumstances.
Everyone knows that it’s not worth it. No one asks him about the heated area or the previous year’s consumption.
For a 100m² (1,076 sq ft) house, I wouldn’t push it on anyone either. For a larger property, 10% might possibly become interesting under certain circumstances.
S
Steffen8010 Jun 2017 09:33AOLNCM schrieb:
Sure.
The sizing of the heating system depends, among other things, on the usable floor area. How large the house is, how well it is insulated, and how much reserve capacity the new system has? I don’t know.
An 800-liter (210-gallon) combined stratified storage tank starts to get interesting.
The 9.36m² (100.7 sq ft) of its collectors (there must be four) is a bit tight.
With 800 liters (210 gallons), five collectors would be better.Exactly. We have a 1000-liter (260-gallon) combined storage tank, 15m² (161 sq ft) of solar collectors, and two completely separate heating circuits (low and high temperature). My goal is to only need gas in winter. When planning, I wasn’t focused on “saving” but on achieving as much self-sufficiency as possible.
Here, as an example, 1000 liters and 14 m² (150 ft²). From the end of April until now, mid-June, 1 m³ (35 ft³) of gas per week during a week of continuous rain (first graphic).
The fact that all the "not worth it" cases might actually, possibly, under certain circumstances, be worth it can be seen in the second graphic.
It is clear from the numbers that this is not a 100 m² (1,076 ft²) house; much more interesting is the comparison to similar households.
The fact that all the "not worth it" cases might actually, possibly, under certain circumstances, be worth it can be seen in the second graphic.
It is clear from the numbers that this is not a 100 m² (1,076 ft²) house; much more interesting is the comparison to similar households.
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