I have described many different types of solar collectors for hot water supply, space heating of a house, pool water heating and other.
My 3rd KZfaq channel: / @cheapsolarheat3630
№ 15:
This is number 15, and the link to this solar heater is: • Sunbag Solarheizung - ...
The heater has a concave mirror and this absorber from evacuated tubes which convert solar energy into heat for hot water supply and space heating of a house. We understand that the sun rays are focused by the concave mirror on the evacuated tubes. In addition, the tubes receive some energy directly from the sun.
This type of solar heaters was tested by me. For example, I made several similar solar heaters on the basis of this absorber from a cheap polymer film. The results of their testing have been described by my 3rd KZfaq channel, and its link is: / @cheapsolarheat3630
№ 14:
Our number 14 can be made from an old satellite dish. It is obvious that here, solar radiation can create a high temperature which can cut an aluminum can and other.
We understand that a similar effect can be achieved not only with a concave mirror, but also with a lens. For example, it could be a similar lens which has a diameter of 74 cm. Or it could be a Fresnel lens. Or it could be such aqua lens.
Typically, such lenses or mirrors are used for cooking. But some people are trying to install a Stirling engine to produce electricity. Or it can be an absorber which heats water for hot water supply or other purposes.
№ 13:
These solar heaters use old plastic bottles around dark pipes or hoses. Adding some types of dark or reflective surfaces can significantly increase the efficiency. Typically, these systems are used for hot water supply.
№ 12:
This is number 12, and it is a relative of these solar heaters with number 14. It is obvious that the number 14 requires constant movement in 2 directions according to the motion of the sun. But the number 12 has a simpler and cheaper design because these solar heaters must follow the sun in only 1 direction, instead of 2.
My solar station has a similar design, but it does not require following the sun from morning to evening. The principles of such solar heaters without following the sun were described by these two videos of my KZfaq channel. I built this station almost 6 years ago for space heating of the house and for heating water of its pool.
My KZfaq channel pays a lot of attention to our number 12 because I see great prospects for this type of solar heaters. I am trying to reach the cost of our solar heat less than 1 cent / kWh, and it is several times cheaper than the cost of heat from natural gas. If we achieve this goal, such solar heaters will be interesting for district heating, similar to this solar station which gives heat to one of the Danish towns. If our heat with high temperature will be cheaper than 0.5 cent / kWh, we can create similar solar stations for the production of maneuverable electricity with a price of 3-5 cent / kWh.
That is why my station is testing these cheap mirrors on the basis of reflective polymer films and on the basis of free strips of glass mirrors which are wastes of various glass workshops. In addition, I am trying to find even cheaper types of mirrors, and for example, my previous video described these experiments. Another of my old videos described the features of this mirror which is a stainless steel sheet.