At present, solar air conditioning is achieved mainly through cooling and heating using solar thermal energy, which can generally be divided into absorption and adsorption. Absorption refrigeration technologies are those that use absorbent absorption and evaporation properties of absorbents and are divided into ammonia-water absorbent refrigeration and brominated lithium-water absorbent refrigeration, depending on the absorbent. Absorption-based refrigeration technologies are solar collectors that collect solar energy to generate hot water or hot air, and use solar hot water or hot air to replace boiler hot water for cooling in chillers. For reasons of price, process, efficiency, etc., such chillers should not be too small. Solar air-conditioning systems using this technology are generally applicable to central air-conditioning, and systems need to be of a certain size; however, normal household air-conditioning technologies can be converted to solar air-conditioning, which is low-cost and simple. Adsorption-based refrigeration technologies are used to cool with solid adsorbent adsorption to refrigerants, often with molecular sifting of water, active carbon-based methanol adsorption refrigeration. Air conditioners using solar energy as an energy source can generally be divided into three parts:
One is the solar collector. The collectors are diverse in form and performance. The collectors use the most vacuum tubes, the most basic of which are three types: thermal tubes, the vacuum collectors, the glass-wide vacuum collectors, and the straight-through vacuum collectors. Thermal tubes are high-tech energy-saving products that follow the traditional flat-board vacuum collectors, which combine thermal tubes and vacuum technologies and increase the working temperature of solar collectors from 7o ~c to above 120°c, significantly improving the heat performance of the collectors, an ideal product for thermal use。
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