Compact ammonia/water absorption chiller of different cycle configurations: parametric analysis based on heat transfer performance

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dc.contributor.authorTao, Xuan
dc.contributor.authorThanganadar, Dhinesh
dc.contributor.authorPatchigolla, Kumar
dc.date.accessioned2022-09-13T14:00:36Z
dc.date.available2022-09-13T14:00:36Z
dc.date.issued2022-09-06
dc.description.abstractAmmonia/water absorption chillers are driven by low-grade heat and cover wide refrigeration temperatures. This paper analyses single-stage ammonia/water absorption chillers. A numerical model was developed based on the heat exchanger performance. The model captures variational heat exchanger performances and describes the actual cycle with varying boundary conditions. The detrimental effects of refrigerant impurity were analysed quantitatively under different operating conditions. The model was validated with experimental data. A basic cycle and three advanced cycles were analysed for sub-zero refrigeration by comparing the thermodynamic performances. A compression-assisted cycle extended the activation temperature from 80 to 60 °C. At the heat source of 120 °C, when a counter-current desorber or bypassed rich solution was used, the COP increased from 0.51 to 0.58 or 0.57, respectively. The operating parameters included the heat source temperatures, heat sink temperatures, the mass flow rates and mass concentrations of rich solutions. Higher heat source temperatures increase cooling capacity. The increase was around 20 kW for the basic cycle of sub-zero refrigeration. There is an optimum heat source temperature maximising the COP. Higher heat source temperatures increased the refrigerant mass flow rate and reduced the mass concentration. The mass concentration can decrease from 0.999 to 0.960.en_UK
dc.identifier.citationTao X, Thanganadar D, Patchigolla K. (2022) Compact ammonia/water absorption chiller of different cycle configurations: parametric analysis based on heat transfer performance. Energies, Volume 15, Issue 18, September, Article number 6511en_UK
dc.identifier.issn1996-1073
dc.identifier.urihttps://doi.org/10.3390/en15186511
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18441
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectammonia/wateren_UK
dc.subjectcycle configurationsen_UK
dc.subjecttemperature glideen_UK
dc.subjectheat source temperatureen_UK
dc.subjectheat transfer modelen_UK
dc.subjectplate heat exchangeren_UK
dc.subjectabsorption coolingen_UK
dc.subjectsolar refrigerationen_UK
dc.titleCompact ammonia/water absorption chiller of different cycle configurations: parametric analysis based on heat transfer performanceen_UK
dc.typeArticleen_UK

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