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Compact evaporators for sorption systems.

Évaporateurs compacts pour les systèmes à sorption.

Author(s) : GIRAUD F., TREMEAC B., VALLON P., et al.

Type of article: Article

Summary

Compact evaporator like plate heat exchangers can play a significant role in reducing the investment cost of low cooling power sorption systems. If water is used as refrigerant, their design remain mainly empirical. There is thus a need of better characterization of the influence of the driving parameters in order to optimize the evaporator design. For this purpose, two different experimental set-ups were developed. The first one, allows to study the performance of an industrial evaporator implemented in an adsorption system of 5 kW. The second one allows to study the thermal behavior and the flow regime inside the channel of a smooth platetype heat exchanger initially designed to provide a cooLing capacity of 0.7 kW. It is shown that, regarding the first heat exchanger (jndustrial heat exchanger), the maximal cooling capacity which could be achieved in the experimental domain is of 2 kW, which is less than half of the cooLing capacity expected. Regarding the smooth plate-type heat exchanger, it is shown that 70 % of the heat exchange is due to the evaporation of a liquid film previously created by the growing and then the breaking of bubbles of several centimeters. Dimensionless numbers were then developed in order to pro vide some first tools and guideLines towards the design of compact evaporators.

Details

  • Original title: Évaporateurs compacts pour les systèmes à sorption.
  • Record ID : 30023976
  • Languages: French
  • Source: Revue générale du Froid & du Conditionnement d'air - n.1162
  • Publication date: 2017/03

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