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| How to choose a solar water heater ? |
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Solar Water Heater Knowledge
How many kinds of solar water heaters there are?
1. The first era is sealed and solarized heater. This is a whole heater combining gathering heat and accumulating heat into one, which is generally made up with two to there round tubes painted black. The blank coating absorbs heat to heat the water. The advantages: simple structure and lower cost of construction, and the disadvantages: too quick rejection of heat, you can not use it in winter or rainy day. This product is only used in outlying villages and now has been superseded by the large.
2. The second era is flat-plate solar water heater. It is made up with plat-plate heat collecting water tank, and generally runs in natural circulate style. The flat-plate heat collector consists of the body for absorption of heat, transparency coverer, insulating layer for back and side face, and framework. The body of flat-plate heat collector for absorption of heat, produced by nation factories, includes multiple-unit of copper and aluminium plate, copper all-over plate and flat case welded by stamping from stainless-steel, etc. They all insure the cleanliness of water and their side toward the sun paint acrylic acid black lacquer or selective anode oxidated colored coating. Their insulating material for back and side face often use the board of foaming poly ammonia adeps, rock wool and poly styrene (it will shrink when heated, must be separated from the absorbing body by glass wool or reflective thin wool), the framework usually uses the aluminium shape specially projected (inlay the glass and sealing materials). The transparent coverer uses the 5mm flat-plate glass. Its features: lower cost of construction, high rate of heat, it can produce hot water when sunny; but its rejection of heat is too quick and the heat consumption is too much, in cloudy day or winter the temperature of water will not be easy to be high for bathing.
3. The third era is vacuum tube water heater. It usually adopts natural convection for exchanging heat, which is made up of several glass vacuum tubes for heat collection insetting the water tank directly. There is silica gel band between each vacuum tube for collecting heat and the hole of water rank. The vacuum tube transfer heat through super conductor in the copper heat tube rather than water, so the rate of heating is high and the tube does not make water scale. Many water heaters in our country adopts glass tube for heat collection, which is made out of the concentricity sleeve pipes of high borosilicate glass, whose diameter is 37mm, 47mm, or 58mm. The space between the two tubes is drawn to be vacuum of 5*10-3pa, and the outside of the inner tube deposits some gradating aluminium nitrogen/aluminium. The solar spectrum absorbs the coating selectively (the rate of absorption is a=0.90~0.92, the rate of emission is b=0.06~0.1), and the length of the tube has two kinds: 1.2m and 1.5m. The heat consumption rate of the vacuum tube is small (U=0.55~1.2W/m2.0C), so you can use the heater both in rainy and varied weather. The features of the heater is as follows: high heating rate, quick heat absorption, slow heat elimination, small heat consumption; as long as the radiant of the sun reaches the command, you can also use it in winter and rainy days; it also has sumptuous appearance long lasting even more than 15 years and small areas, and it suits the family use well.
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Between the flat-plate water heater and the vacuum tube water heater, which is better?
1. The vacuum tube heater is better in the effect of absorption. With same area for heat collection, the vacuum tube heater can bring out more hot water, but the area of flat-plate heater usually is large, so the effect of it is also good.
2. In the heat consumption the vacuum tube heater is better. The plate type has gel band for sealing, but is not good contrasting to the vacuum tube with high vacuum, this is the reason that why the plate type does not use well in winter and rainy days. The vacuum tube type absorbs heat easily and has small heat consumption because of the vacuum layer spacing out the outside, so it can be used in both winter and rainy days.
3. From the economy, the plate type uses cheap materials and boards for heat absorption with lower costs of constructions. The holder of it usually uses angle block, and the outside coverer of water rank is made of colored steel. Its rude material is cheap, so it is suited for the families with lower incomes. The vacuum tube type has chichi appearance and is endurable, so it is suited for the families with high incomes.
4. With the view of their lifetimes, generally, the flat-plate type is 10~15 years and the vacuum tube type is 15~20 years.
5. From the materials, the flat-plate type usually uses aluminium, copper, angle block, flat glass, etc. and the vacuum tube type uses stainless-steel, high boron silica glass, etc. and the latter is sumptuous and endurable.
What are the merits of solar water heater?
1. Economic. The light of sun is free, you only need cost 2000~3000 ¡ê¡è on instruments for 15~20 years use, which saves much fees for coal gas and electric.
2. Convenient. Place it on the flat of your house, and you have hot water supply every moment without waiting. It is very convenient.
3. Safe. You do not need to be terrified of coal gas poisoning, current leakage and other thing except scalded by the too hot water.
4. Environment protection. It does not emit any exhaust air to pollute the environment, so it is a green environment protection and energy-saving product.
5. Popular. Solar water heater will replace the traditional coal gas heater or electric heater. You are a person noticing environment protection and knowing enjoying life and you are in the beginning of the tidal current if you use it now.
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