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Experimental study of a thermochemical compressor for an absorption/compression hybrid cycle

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  • Ventas, R.
  • Vereda, C.
  • Lecuona, A.
  • Venegas, M.

Abstract

An experimental study of a thermochemical compressor with ammonia–lithium nitrate solution as working fluid has been carried out. This compressor incorporates a single-pass adiabatic absorber and all the heat exchangers are of the plate type: absorber subcooler, generator and solution heat exchanger. The thermochemical compressor has been studied as part of a single-effect absorption chiller hybridized with an in-series low-pressure compression booster. The adiabatic absorber uses fog jet injectors. The generator hot water temperatures for the external driving flow are in the range of 57–110°C and the absorber pressures range between 429 and 945kPa. Experimental results are compared with a numerical model showing a high agreement. The performance of the thermochemical compressor, evaluated through the circulation ratio, improves for higher absorber pressures, indicating the potential of pressure boosting. For the same circulation ratio, the driving hot water inlet temperature decreases with the rise of the absorber pressure. The thermochemical compressor, based on an adiabatic absorber, can produce refrigerant with very low driving temperatures, between 57 and 70°C, what is interesting for solar cooling applications and very low temperature residual heat recovery. Efficiencies and cooling power are offered when this hybrid thermochemical compressor is implemented in a chiller, showing the effect of different operating parameters.

Suggested Citation

  • Ventas, R. & Vereda, C. & Lecuona, A. & Venegas, M., 2012. "Experimental study of a thermochemical compressor for an absorption/compression hybrid cycle," Applied Energy, Elsevier, vol. 97(C), pages 297-304.
    • Handle: RePEc:eee:appene:v:97:y:2012:i:c:p:297-304
    DOI: 10.1016/j.apenergy.2011.11.052
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    References listed on IDEAS

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    1. Wu, Shenyi & Eames, Ian W., 2000. "Innovations in vapour-absorption cycles," Applied Energy, Elsevier, vol. 66(3), pages 251-266, July.
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    3. Rameshkumar, A. & Udayakumar, M. & Saravanan, R., 2009. "Heat transfer studies on a GAXAC (generator-absorber-exchange absorption compression) cooler," Applied Energy, Elsevier, vol. 86(10), pages 2056-2064, October.
    4. Palacios, E. & Izquierdo, M. & Marcos, J.D. & Lizarte, R., 2009. "Evaluation of mass absorption in LiBr flat-fan sheets," Applied Energy, Elsevier, vol. 86(12), pages 2574-2582, December.
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    Cited by:

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