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Questions tagged [solar-thermal]

The use of sunlight to generate heat, usually in water. Heated water can be used directly or it can drive a turbine to generate electricity. For questions on generating electricity using semiconductors see [photovoltaics].

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Are there any good diy examples of home level STES or BTES

I just came across the concept of STES - Seasonal Thermal energy storage and more specifically BTES - Borehole Thermal Energy Storage. https://en.m.wikipedia.org/wiki/Seasonal_thermal_energy_storage ...
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Can hot air move horizontally without a fan (vertical is easy)

Passive solar thermal, taking cool air at bottom and hot air out at top is easy. But can the same 'hot air rising' system be made to work horizontally. IE long black tube on a narrowboat Any ideas ...
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Why is solar energy so expensive?

I was surprised to find out recently that solar power plants tend to be more expensive than traditional energy plants based on depletable resources like coal and oil. Why is that? It seems as though ...
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Reference request - Overview over established solar thermal desalination technologies

I'm looking for an overview of established solar thermal desalination technologies. The wiki page is remarkably poor on sources. "Established" means there is a large scale plant (>50 m³/d) or many ...
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Need critique of my idea for a passive heating and cooling system for a tent/waterbed

The Idea A small thin waterbed mattress inside a tent cot that is filled with water that's heated by the sun during the day and cooled at night. The Details Get this tent cot and water mattress (...
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Is it cost effective to use a solar panel in an apartment if I have a low electricity bill?

I would like to be more sustainable and I am thinking of installing a solar panel on the roof of my apartment, my question is how cost effective I will be knowing that my current electricity bills are ...
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Failed “solar thermal” water heating system

I bought a house in Hawaii in 2014 which had 2 4'x8' solar thermal panels, a 120 gallon solar tank with 1 upper grid tied 4500W element. The previous owners had had multiple problems: leaks, replaced ...
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What software should I use to design and simulate a solar-assisted cooling system? [closed]

I will be developing a solar-assisted absorption cooling system similar to the one described in the image attached. What software could I use to design and simulate a thermal system like the one ...
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How do white roofs cause global warming?

Another user asked the question, and I think the question is important enough to deserve it's own post. I've heard that white roofs drive away clouds and cause global warming. How can this be?
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Are there solar concentrator builds that work without tracking?

In theory, you could take a box, coat the inside with a mirroring material and have a smallish black object inside. Then cut a hole in one wall. Theoretically, a big part of the light entering the box ...
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Pool, sauna and shower with electric heating and solar thermal vs gas heating?

I have four things that need to be heated on my house: Pool (28.000 liters solar thermal heated) Jacuzzi (I think that is like 400-600 liters is gas heated) Showers (actually they are all electric) ...
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Solar Window Heater at Night

I have been thinking for a long time about building a Passive Solar Window Heater similar to this: I live in northern - North America which during the winter ranges from 30°F during the day to 0°F at ...
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How efficient is it to use an electric car as storage for the energetic overload generated during sun hours (peaks) by solar panels?

I guess that the question is quite self-explanatory. I am hoping to invest in a solar panel soon, but I am a little worried about it getting inefficient once government subsidies run out and the ...
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Instructions for making, and comparisons of, *small* solar thermal collectors

The web has probably thousands of pages with instructions on how to build solar devices for heating air, water, and probably things I've never even thought of. Wikipedia describes different types of ...
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How to measure the energy output of a thermal solar hot water system?

I have a (thermal) solar hot water system with electric heating, and I'd like to be able to measure the amount of energy provided by just the solar heating. The system is set up like this: Water ...
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How do I keep my solar panels clean?

What sort of cleaning regime should I have for a solar energy system, and do PV and solar-thermal panels need to be treated differently?
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What advantages (any?) has water heating via photovoltaic system over solar thermal system?

Both solar thermal water heating systems and photovoltaic systems already have a good commercial background. Efficiency of energy gain of a solar thermal system is about 80%, while photovoltaics is up ...