Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

As Much Hot Water As Your Need Or The Sun In Trap

14.02.2006


A unique solar collector was developed by specialists of the Moscow “ALTEN” company under the guidance of Boris Kazandzhan, Professor, Doctor of Science (Engineering), Moscow Power Engineering Institute. Originality of the novelty lies in its extremely high efficiency. The collector not only manages to entrap the heat of solar beams falling on its surface, but also to utilize it to a great extent for direct purpose – for water heating.



Evidently, the idea of water heating in sunlight is not at all new. Water barrels painted black are installed on self-made showers perhaps at every country plots, allowing their owners to take a warm shower in summer. Alas, even in the hottest day, the temperature in the barrel is not too high, and there is no means for warming the house by radiators with the water heated in such an old-fashioned way.

The problem is that it is very difficult to catch solar energy and then to retain it. Habitual objects: a water barrel or a bench at the sunny side near the pond in the park do catch visible light energy and become warm – and immediately give a major part of this energy back into the ambient space, mainly in the form of infra-red radiation and convection.


To increase efficiency of absorption of solar energy and to reduce loss of heat, a special selective multi-layer coating based on titanium carbide is used. On the outside, it is dark as it should be to absorb light well. But its peculiarity is that having become warm, the coating almost does not radiate thermal energy. Thus, the coating allows to entrap solar energy in the visible and near infra-red spectral region where more than 90 percent of solar energy is concentrated, and almost not to irradiate energy into the spectral regions corresponding to radiation of heat. The heat entrapped in such a way is collected by water that flows along copper tubes embedded into aluminium shapes covered by a selective coating and forming a so-called absorber. Instead of water, however, some other heat carrier may be used, but water is the cheapest of all.

To protect the reserved heat from being blown away by wind, in other words – to reduce loss of heat into the environment due to convection, the absorbers are inserted into special plastic casings. The casings are made of polycarbonate, which is not solid but cellular. The cells are hollow, that is why the air inside them is motionless, thus allowing to preserve the heat of water warmed by the Sun no worse than a good down-bed does. As for polycarbonate, it passes the light through very well, it does not get warm and does not cast shadow, so it does not impede the work.

As a result, during a sunny day, one collector of 2 square meters in area can heat approximately 150 liters of water up to the temperature of 60 to 70 degrees C. If necessary, water can be heated up to the boiling point. Several collectors can provide for hot water-supply and heating of a small cottage. Evidently, in the moderate climate, for instance, in the Moscow Region, it makes sense only during the “long” summer season since early spring till late autumn. In wintertime, one cannot survive only on solar heat, be the efficiency of such system even one hundred percent. However, in the mild European climate the system would serve all year round, to say nothing about warm areas. In near future, the first house with such heating will appear in the town of Sochi. Its front will be decorated with the ALTEN solar collector boards. The house will be provided with hot water the whole year round.

Sergey Komarov | alfa
Further information:
http://www.informnauka.ru

More articles from Power and Electrical Engineering:

nachricht Engineers program tiny robots to move, think like insects
15.12.2017 | Cornell University

nachricht Electromagnetic water cloak eliminates drag and wake
12.12.2017 | Duke University

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Error-free into the Quantum Computer Age

A study carried out by an international team of researchers and published in the journal Physical Review X shows that ion-trap technologies available today are suitable for building large-scale quantum computers. The scientists introduce trapped-ion quantum error correction protocols that detect and correct processing errors.

In order to reach their full potential, today’s quantum computer prototypes have to meet specific criteria: First, they have to be made bigger, which means...

Im Focus: Search for planets with Carmenes successful

German and Spanish researchers plan, build and use modern spectrograph

Since 2016, German and Spanish researchers, among them scientists from the University of Göttingen, have been hunting for exoplanets with the “Carmenes”...

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

The body's street sweepers

18.12.2017 | Life Sciences

Fast flowing heat in layered material heterostructures

18.12.2017 | Materials Sciences

Life on the edge prepares plants for climate change

18.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>