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A Hybrid no Frost Refrigeration System Using a Membrane Based Desiccant System

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Résumé

Frosting is a major problem in refrigeration systems and its accumulation on the evaporator of a vapor compression cycle deteriorates the coil’s performance. In some applications, frost is avoided by dehumidifying the air using solid desiccant wheels which are regenerated usually through electrical means causing high energy consumption. Thus the use of liquid desiccants that offer easier energy integration allows proposing a hybrid system where the desiccant regeneration is done by the waste thermal energy from the condenser of the compression cycle. The system’s dehumidifier consists mainly of a membrane based heat and mass exchanger necessary to prevent the escarpment of the desiccant solution droplets to the air avoiding corrosion problems. This paper proposes a model of such a membrane exchanger to derive sensitivity analysis of the key design parameters. Three architectures are studied where in the first architecture the desiccant solution only dehumidifies the air while the evaporator does the entire cooling. In the second architecture the desiccant simultaneously cools and dehumidifies the air and here the evaporator of the vapor compression cycle is used only to cool the desiccant. The third is where the desiccant dehumidifies and only pre-cools the air while the evaporator cools the air in cascade.
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Dates et versions

hal-01561415 , version 1 (12-07-2017)

Identifiants

  • HAL Id : hal-01561415 , version 1

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Rasha Mustapha, Khalil El Khoury, Zoughaib Assaad. A Hybrid no Frost Refrigeration System Using a Membrane Based Desiccant System. 30th International Conference on Efficiency, Cost, Optimisation, Simulation and Environmental Impact of Energy Systems (ECOS 2017), Jul 2017, San Diego, Californie, United States. ⟨hal-01561415⟩
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