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The solar adsorption refrigeration system is shown in the figure below. Solid adsorption refrigeration uses the adsorption and desorption of refrigerants (such as water, methanol, ammonia) by solid adsorbents (such as zeolite, activated carbon, calcium chloride) to achieve refrigeration cycles. This adsorption and desorption process causes pressure changes, which is equivalent to the function of a refrigeration compressor. The regeneration of the adsorbent can be carried out at 65 to 200°C, which is very suitable for the utilization of solar energy. Adsorption refrigeration has a series of advantages such as simple structure, low operating cost, no noise, no environmental pollution, basically no power components, and the ability to effectively utilize low-grade heat sources. Solar radiation is intermittent, so solar adsorption refrigeration systems operate in a basic cycle mode. Critoph describes the solar solid adsorption refrigeration cycle into four stages, namely, constant volume heating process, constant pressure desorption process, constant volume cooling process, and constant pressure adsorption process. As shown in the figure, it represents a solid adsorption refrigeration device based on a solar refrigerator. Its components include an adsorption/generator that uses solar heating, a condenser, an evaporator, a valve, and a liquid reservoir. It is characterized by simple structure, low one-time investment, long service life, no crystallization, etc., and it can be used in places with vibration, tilting, and rotation. But compared with compression and absorption systems, this technology is still very immature. The main problem is that the solid adsorbent is a porous medium with low thermal conductivity, so the adsorption and desorption time is long, the refrigeration power is small, and the refrigeration performance coefficient COP value is low.