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An absorption refrigerator is a refrigerator that uses a heat source to provide the energy needed to drive the cooling process. Solar energy, burning a fossil fuel, waste heat from factories, and district heating systems are examples of heat sources that can be used.
The characteristics of the adsorbent/refrigerant pair is crucial in determining the system performance of an adsorption refrigeration system. [4] [1] The typical system performance indicators for an adsorption refrigeration system are the coefficient of performance and the specific cooling effect. [4]
The cooling performance coefficient is 0.8 to 1.6, the heating performance coefficient is 1.2 to 2.5, and the heat transfer performance coefficient is 0.4 to 0.5. [4] When they are applied in industry, the absorption heat pumps should be properly placed in terms of energy and they must satisfy the limitations of special features of the ...
The first cooling systems for food involved ice. [6] Artificial refrigeration began in the mid-1750s, and developed in the early 1800s. [7] In 1834, the first working vapor-compression refrigeration system, using the same technology seen in air conditioners, was built. [8] The first commercial ice-making machine was invented in 1854. [9]
Single, double or triple iterative absorption cooling cycles are used in different solar-thermal-cooling system designs. The more cycles, the more efficient they are. Absorption chillers operate with less noise and vibration than compressor-based chillers, but their capital costs are relatively high. [10]
The Helsinki district cooling system uses otherwise wasted heat from summer time CHP power generation units to run absorption refrigerators for cooling during summer time, greatly reducing electricity usage. In winter time, cooling is achieved more directly using sea water.
When combining a passive daytime radiative cooling system with thermal insulation and evaporative cooling, one study found a 300% increase in ambient cooling power when compared to a stand-alone radiative cooling surface, which could extend the shelf life of food by 40% in humid climates and 200% in desert climates without refrigeration. The ...
Passive cooling covers all natural processes and techniques of heat dissipation and modulation without the use of energy. [1] Some authors consider that minor and simple mechanical systems (e.g. pumps and economizers) can be integrated in passive cooling techniques, as long they are used to enhance the effectiveness of the natural cooling process. [7]
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