Solar energy water heater hot water form
1) stuffy dry type solar water heater
In the solar water heater, stuffy dry type structure is simple, the cost is low. This kind of heat exchange all the points have bravery and shine. Have refers to solar fujian sun party of water containing black plastic or gold scrap. When solar radiation to the cabinet drying box, box temperature, the water bile in the water is heated. When the water temperature reached a certain requirement, put hot water use. Currently on the market of plastic single short form or Jane was chip in this type of heater, generally is a seasonal use. Plastic pillow also have cabinet drying heater, water heater only simplified the cabinet drying box, and in a transparent plastic cover on water plastic water bag, inflatable plastic bags, to play the role of a secondary floor glass, under solar radiation, the formation of the greenhouse effect, make the black plastic bag to absorb the radiant heat of the sun, and directly to heat to the bag of the water. This water heater production of hot water is not big, but easy to carry and can be used when traveling
No bravery stuffy dry type water heater, shallow pool of water heater, it works similar to stuffy bask in the sun shi. Usually shallow mission to build his water heater is a field in the building roof, but there are for the use of factory production of tin box of shallow pool. Either with concrete pouring system, or the purchase of shallow pool of shaping box, require light he could not too high, generally for 15-20 handsome, diving depth 5 a lo ng, about 10 c from the surface of the water sealed in a transparent glass. Pool area is not strict, the inner wall of the pool must be coated with black. Such a shallow pool of water heater only seasonal use, in situations where the temperature is not too low, after 4, 5 h the sun to be basked in the stuffy, pool water temperature of 40 ℃ or so. If the constant temperature water, can be basked in hot water in the heat preservation hot water tank, to cold water, can improve the production of hot water.
2) the streaming can sun water heater
Once-through solar water heater collector, heat storage water tank and the corresponding pipe. Today is not in this system water cycle, therefore calls the once-through. To make collector flowed out of the water has enough temperature, the flow of water is usually smaller.
3) circulation solar water heater
Circulating solar water heater is applied to a wide range of water heater. According to the water cycle of the power and can be divided into natural circulation and forced circulation. Figure 2.3 is the natural circulation diagram of solar water heater. Water tank in the cold water enters from the bottom of the collector, temperature rise after absorb solar energy density is reduced, and the density difference between the cold water formed between the cycle power. When circulating water tank using the temperature at the top of the water temperature reached highs, the solenoid valve opens by the thermostat makes the hot water into the hot water tank, meanwhile supply tank automatic filling water. When the water temperature is less than using the lower limit of temperature, temperature controller to close the solenoid valve. This device can users get the required temperature of hot water, use rise very convenient.
Because of the natural circulation pressure head is small, so for large solar energy heating water system usually needs to adopt forced circulation, provided by water circulating pump power.
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