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Efficient deep dehumidification hybrid air conditioning system.

Author(s) : EVRON Y., GOMMED K., GROSSMAN G.

Type of article: Article, IJR article

Summary

Air conditioning (A/C) systems serve two main functions: temperature and humidity control of the conditioned space. This work focuses on a hybrid A/C system consisting of a liquid desiccant system (LDS) and an absorption chiller. An efficient deep-dehumidification hybrid A/C system (EDHACS) configuration is proposed. It is designed to enhance both performance and control. A detailed simulation study of the EDHACS has been conducted, and selected results are described in this article. Liquid desiccant systems (LDS) are exceptionally good at air dehumidification, and hence capable of handling the latent heat load. In conventional air conditioning (A/C) systems, this task is achieved by over-cooling the air below its dew point, which leads to both thermodynamic and practical inefficiencies. An optimal A/C system may be hybrid, consisting of a chiller to handle the sensible load and a low- grade heat driven liquid-desiccant-system (LDS), potentially with storage capability, to handle the latent load. The hybrid system has the added advantage of allowing independent control of temperature and humidity, thereby providing much-improved thermal comfort.
Simulation results show that the EDHACS outperforms any other hybrid configuration that was tested. Its dehumidifier is split in two to take advantage of both the ambient and the chiller cooling capacity as heat sinks. By minimizing absorbent circulation between the two dehumidifiers, two distinct dehumid- ifier temperature levels are maintained, thereby further improving performance –resulting in increased COP and capacity values, and lower supply air temperatures.

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Pages: 50-58

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Details

  • Original title: Efficient deep dehumidification hybrid air conditioning system.
  • Record ID : 30026903
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 105
  • Publication date: 2019/09
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2018.11.008

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