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Solar heating during the winter? Answered

My hose is badly insulated and leaks everyhwere.
And being a renal there is only so much I can do to fix certain issues.
After looking at some modern designs for heat pumps in homes and how they claim to be able to provide hot water from the sun during the winter I started to wonder...

Has anyone in colder climates a solor hot water thingy on their roof?
I know hey work really great during the summr to keep the costs for hot water down but how do they perform at temperatures between 0 and 15°C ?
How much water can they then still warm up and how quickly?
Can you provide some real life numbers from your system, preferaby in above conditions or below thse temps?

Why am I thinking about slor hot water systems in the winter ayway you wonder?
Well, the Aussie sun still has a decent bite during the sunny winter times.
Even on a 5° day the inside of yur car gets cosy warm quickly if you left it in the sun.
I start my day in the middle of the night when most people turn arund and go for a few more hours.
Means early bed times as well :(
You see the problem ?
You wake up and he house is freezing cold but it makes no sense to turn the heater on for the 30 inutes until you leave for work.
Then you come home to a still freezing home and turn the heater on until you go to bed.
Wouldn't it be great to be able get few more degrees inside by utilising a solar hot water system and a radiator in one of the rooms?....
And with the entire "excess" of a solar hot water system one could even consider using the storage tank to get heated during the day to be used for a few hours when the sun is gone to give the real heater a break...

Any thoughts or user experience with similar?

Comments

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liquidhandwash
liquidhandwash

11 months ago

I had some water heating panels on the roof for a while, the frost got it and killed them I wouldn't recommend them unless you live in a warm climate. Have you considered photovoltaic? You can get used ones quite cheaply and just run an oil heater with it. They will run on DC just fine. You will have to put a capacitor on the thermostatic switch to stop it arcing but apart from that It will work just the same. If you got six of the panels below, and run the heater all day, the oil acts as thermal mass and keep the house warm at night.
https://www.gumtree.com.au/s-ad/cranbourne-east/bu...
the video is very long winded look at about the 7 minute mark



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Downunder35m
Downunder35m

Reply 11 months ago

Not sure if my landlord would agree on a bunch of big panels, otherwise I would consider it.
Not the most efficient way but definately feasable.


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liquidhandwash
liquidhandwash

Reply 11 months ago

I hear what your saying, the advantage it also that you don't have to run pipes everywhere, and you don't need pumps controllers and a dump valve, or a hot water cylinder.
good luck with your project

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Orngrimm
Orngrimm

11 months ago

A good friend of mine has almost all his hot water from the sun also during winter. We live in switzerland and temperatures can go well below freezing.
What he did:
- Added an option to pump warm water from the tank to the collector to melt the Snowcover if present
- Added an option to automatically empty / drain the lines when the water-temperature in the collector goes below i think 5 degrees centigrade. This is only happening if he is on holidays and snow covers the panels.

But with these 2 modifications to his stock-collector, he can generate quite hot water even during overcast winter. I am unsure however, what he added in terms of energy-reclaiming from wastewater and preheating the incoming water to the boiler with collector-Water or Waste-water-heat...
That said, he also has a electrical boiler to kick the water-temp if needed

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Downunder35m
Downunder35m

Reply 11 months ago

Thanks!

I know the normal systems all come with an added heater but we rarely get into the frost temperatures around here.
Like the idea of removing th water from the panel once it gets cold.
Better to have it in the tank than getting really cold.