Go Greener Tips

When light falls on any surface, its temperature rises comparing with the surrounding air. This temperature increase is the result of accumulation of heat on the surface due to energy absorption of solar radiation. If a heated surface we’ll have capacity, which will circulate the water, the water will be heated.

Time raising the temperature to the desired level depends on the amount of calories, which receives water from the sun, as well as from the device absorbing elements (solar collectors) and batteries (tank, tank).

Dr. SGAbbott, a pioneer in the study of solar energy, in his book “How to use the heat from the Sun” describes the primitive, but nonetheless a convenient generator of hot water this way: “I bought a 6 m long, black garden hose, wound 4m around a wooden frame and raised the design of the stairs on the south side of the roof of my house. Others 1,5 m I tied to the faucet in the yard and to the faucet in the bathroom. With this simple device on a sunny day we had a very warm 22 liters of water every half hour.

Of course, installation, commercially profitable, now is not so simple. However, they are arranged but the same principle, albeit with much greater efficiency.

Modern solar hot water generator consists of two main parts: a solar collector and the reservoir with warm water. The surface of the collector can heat water from 50 ° C to 80 ° C. In the vacuum collectors with ideal surfaces, the temperature reaches 300-350 ° C. The use of parabolic radiation concentrators allows to reach even higher temperatures. Sun-heated water from the reservoir (55-56 ° C) enters the heat exchanger solar tank (tank), which is heated to the desired use of water (150 – 500 liters). This heating may be different depending on the duration and intensity of sunlight. The circulation of heated water could be due to thermosyphon principle or with a pump, which is controlled by a thermostat, set at the highest reservoir.

Tanks (tanks) may be made of metal or plastic and must be thermally insulated. For industrial purposes, which require a lot of water, use of mass production of tanks with a capacity of several thousand liters. These tanks are suitable for hospitals, barracks, bath houses, campgrounds, hotels, boarding schools, etc.

Collectors may be combined in series, and the daily rate sun-warmed water, thus, will be increased.

8 North Africa and the Middle East are set to give a day 50-100 thousand liters of hot water. Large installation of this kind exist in Europe. For example, the French firm “Sofe has built a highly productive installation at the hotel with 35 rooms and camping. In Bern, Switzerland, operating facility, which produces 9 thousand liters of hot water with the help of 40 m2 surface of the reservoir.

In some Japanese plants solar collectors and tanks, batteries constitute a single system. To ensure that the natural thermo circulation, tanks must be at least 600 mm higher than the upper reservoir, if it is not possible to use a circulating pump. Contact with the house is reinforced by thin copper tubes with a diameter of 30 mm, the use of which avoids the heat. For cloudy days provides electric heating element with capacity 0,5 – 2 kWh, an adjustable thermostat. Tanks and piping work under pressure of about 6 atm., And the test pressure, in many cases equal to 10.12 atm.

Be smart and use the help of solar power grants to convert your life to enhanced ecological balance with nature. Read about solar power grants, how to make proper use of them and where you can apply for these solar power grants.

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