Abstract
Adsorption heat pumps are becoming increasingly popular. Due to their design, they enable application of low-temperature heat sources. Evaporators for adsorption chillers make one of the basic design elements determining the correct operation of these devices. The specificity of operation in low pressures and temperatures is the reason why their design significantly differs from that of conventional evaporators. The pluralities of existing solutions as well as the lack of a systematic review of them cause difficulties in correct evaluation and choice of design. The paper presents the current state of art as well as a review of the existing solutions of evaporators used in adsorption heat pumps. The purpose of the review research is to present various solutions of evaporators as well as indicating their advantages and disadvantages in order facilitate the choice of the optimal design.
Highlights
Evaporators for adsorption refrigeration appliances operate at low pressure and temperature regimes
As for an evaporator, for such low pressures that occur in adsorption heat pumps (~1 kPa), the liquid accumulated there forms a liquid column which causes an increase in the saturation temperature in the lower, submerged area of the evaporator, leading to a drop in the cooling capacity of the adsorption heat pump [1,2,3,4]
- flooded; - capillary assisted; - falling film. The latter two designs allow for reducing the most essential disadvantage of flooded evaporators, which is the above-mentioned adverse effect of the hydrostatic pressure of the water column on the functioning of low-pressure evaporators [1,2]. Both within the chilled water flowing inside the tube bundles and on the outside of it, on the side of the cooling agent, represents an essential contribution to the total heat transfer resistance
Summary
Evaporators for adsorption refrigeration appliances operate at low pressure and temperature regimes. The latter two designs allow for reducing the most essential disadvantage of flooded evaporators, which is the above-mentioned adverse effect of the hydrostatic pressure of the water column on the functioning of low-pressure evaporators [1,2]. Heat flow resistance, both within the chilled water flowing inside the tube bundles and on the outside of it, on the side of the cooling agent, represents an essential contribution to the total heat transfer resistance. The paper contains more detailed characteristics of the methods of enhancing heat transfer within evaporators of adsorption chillers
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