Physical and operating conditions effects on silica gel/water adsorption chiller performance

Ahmed R.M. Rezk, Raya K. Al-Dadah*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Adsorption refrigeration systems are commercially developed due to the need of replacing the conventional systems which utilise environmentally harmful refrigerants and consume high grade electrical power. This paper presents the key equations necessary for developing a novel empirical lumped analytical simulation model for commercial 450. kW two-bed silica gel/water adsorption chiller incorporating mass and heat recovery schemes. The adsorption chiller governing equations were solved using MATLAB® platform integrated with REFPROP® to determine the working fluids thermo-physical properties. The simulation model predicted the chiller performance within acceptable tolerance and hence it was used as an evaluation and optimisation tool. The simulation model was used for investigating the effect of changing fin spacing on chiller performance where changing fin spacing from its design value to minimum permissible value increased chiller cooling capacity by 3.0% but decreased the COP by 2.3%. Furthermore, the effect of generation temperature lift on chiller performance and the feasibility of using it as a load control tool will be discussed. Genetic Algorithm optimisation tool was used to determine the optimum cycle time corresponding to maximum cooling capacity, where using the new cycle time increased the chiller cooling capacity by 8.3%.

Original languageEnglish
Pages (from-to)142-149
Number of pages8
JournalApplied Energy
Volume89
Issue number1
DOIs
Publication statusPublished - 1 Jan 2012

Fingerprint

Silica gel
gel
silica
Cooling
cooling
adsorption
Adsorption
Press load control
spacing
simulation
Water
electrical power
Refrigerants
Waste heat utilization
Refrigeration
genetic algorithm
water
MATLAB
Thermodynamic properties
physical property

Keywords

  • Adsorption chiller
  • Empirical simulation
  • Silica gel/water

Cite this

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abstract = "Adsorption refrigeration systems are commercially developed due to the need of replacing the conventional systems which utilise environmentally harmful refrigerants and consume high grade electrical power. This paper presents the key equations necessary for developing a novel empirical lumped analytical simulation model for commercial 450. kW two-bed silica gel/water adsorption chiller incorporating mass and heat recovery schemes. The adsorption chiller governing equations were solved using MATLAB{\circledR} platform integrated with REFPROP{\circledR} to determine the working fluids thermo-physical properties. The simulation model predicted the chiller performance within acceptable tolerance and hence it was used as an evaluation and optimisation tool. The simulation model was used for investigating the effect of changing fin spacing on chiller performance where changing fin spacing from its design value to minimum permissible value increased chiller cooling capacity by 3.0{\%} but decreased the COP by 2.3{\%}. Furthermore, the effect of generation temperature lift on chiller performance and the feasibility of using it as a load control tool will be discussed. Genetic Algorithm optimisation tool was used to determine the optimum cycle time corresponding to maximum cooling capacity, where using the new cycle time increased the chiller cooling capacity by 8.3{\%}.",
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Physical and operating conditions effects on silica gel/water adsorption chiller performance. / Rezk, Ahmed R.M.; Al-Dadah, Raya K.

In: Applied Energy, Vol. 89, No. 1, 01.01.2012, p. 142-149.

Research output: Contribution to journalArticle

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