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Parametric analysis aimed at optimizing the control logic of an absorption-based cooling system.

Author(s) : EVOLA G., MARLETTA L., LE PIERRÈS N., et al.

Summary

In recent years, the electricity consumption due to building air-conditioning has relevantly increased. An alternative to conventional air-conditioning systems, based on vapour compression chillers, are the thermally driven chillers, as far as can they be powered also by free thermal energy available from a solar plant. In this paper the performance of a cooling system based on a low-capacity water-cooled LiBr/H2O absorption chiller is studied. The first aim of the work is the definition of the best operating conditions which should be adopted in order to optimize the system performance, in the light of both the First and Second Law of Thermodynamics. To this aim, the following parameters are calculated with reference to the system operation during an average summer day in Mediterranean climate: thermal COP of the absorption machine, electrical COP, exergy efficiency. The performance is investigated in different operating conditions and compared to that of a conventional air-cooled vapour compression chiller, also in relation to the achievable thermal comfort for the occupants. The analysis is carried out in dynamic conditions, by using the simulation platform SimSpark and on the basis of a general model experimentally validated. The paper finally investigates on a possible control strategy based on variable rotational speed of the cooling tower fan.

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Pages: 263-272

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Details

  • Original title: Parametric analysis aimed at optimizing the control logic of an absorption-based cooling system.
  • Record ID : 30001199
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

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