Solar thermal machine beauty
Solar thermal machine is a machine with solar powered. It has many types, uses can also each are not identical, some directly provides power, some used as solar pump, also some for small power generation equipment. However, the basic principle of no more than Rankine cycle engine and Sterling. Have emerged in recent years, direct solar pressure pump, diaphragm pump and solar energy solar hydrogen engine etc..
1) Sterling engine
'Forest engine is a kind of external heating makes the piston reciprocating external combustion engine, in 1916 by the Scotland Robert Sterling (R.Stirltn8) method named. This engine can use a variety of energy, especially because it is external combustion type, so the use of solar energy is very convenient. The characteristics of small volume, high efficiency (up to 40%). Loop Sterling engine by the expansion chamber, a compression chamber, piston, piston and regenerator. The engine should be filled with high-pressure gas, gas can be used air, hydrogen, hydrogen or nitrogen. Expansion chamber by focusing solar radiation, medium cavity is heated, causing swelling, push the piston. Refrigerant and a compression chamber is compressed, so the cooling water heat transfer. The quality of the air distribution piston is greater than the power piston, without any mechanical connection between the two, is completely free state. In the solar heating and water cooling, expansion and compression of the piston is white alternating, motor, power piston power output. Gas distribution piston motion dead plant distribution of refrigerant gas, so that the refrigerant alternative to move between the hot chamber and cold chamber. Heat exchanger made of multilayer metal mesh for general use, it plays a dual role of heat storage and so hot. When the refrigerant heat from the cavity through the heat exchanger into the cold chamber, it is endothermic effect; conversely, it will to refrigerant heat. The power piston output power can be used for power generation, but also can be used for water pump power. So the Sterling engine can constitute a solar generator alone, by hundreds of watts to tens of kilowatts of power. Figure 2.12 is the schematic diagram of solar Stirling generator.
2) solar water pump
The original is the use of solar water pump of the concentrating solar boil the water, the steam to drive a steam engine and pump. This not only large equipment, and the efficiency is very low, is now rarely used. The pressure pump, liquid piston pump diaphragm pump and the sun sun solar water pump model. The pressure pump has the advantages of simple structure, easy processing. The principle is: the use of flat plate solar collector heat low boiling point; use of ethanol (alcohol) as the working fluid, ethanol is heated to generate steam, and along the pipeline into the cylinder; promote the downward movement of the piston, the water transmission pipe flow to the condenser, and the condenser water through the water outlet valve is pushed out; when the piston arrive at the cylinder bottom, steam through the steam pipe into the condenser is condensed, causing the cylinder pressure is reduced; the water under the action of atmospheric pressure from the water flows into the condenser and asked the cylinder, the piston moves up through the air inlet pipe until the population. This is a small circle. The sun
The area of collector can pump, pump water for 25m2, 7.5t, head up to 10 m. |
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