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Article

A Novel Approach to Enhancing the Determination of Primary Indicators in Non-Idealised Absorption Chillers

by
Gábor L. Szabó
Department of Building Services and Building Engineering, Faculty of Engineering, University of Debrecen, Ótemető Str. 2-4, 4028 Debrecen, Hungary
Energies 2024, 17(19), 4858; https://doi.org/10.3390/en17194858
Submission received: 30 August 2024 / Revised: 24 September 2024 / Accepted: 25 September 2024 / Published: 27 September 2024
(This article belongs to the Section K: State-of-the-Art Energy Related Technologies)

Abstract

The accurate optimisation of absorption chillers is often impeded by idealised models that overlook system interactions and machine complexities. This study introduces a validated mathematical description for predicting the primary indicators of non-idealised absorption chillers, accounting for factors such as the electrical work of the Solution Circulation Pump, entropy changes within the refrigerant cycle, and exergy losses. Validation against 13 years of data (2008–2021) from the University of Debrecen’s absorption chiller indicated close agreement, with deviations within acceptable limits. The use of a solution heat exchanger shifted cooling indicators towards their minima. Sensitivity analyses indicated that a 2.5% reduction in condenser temperature increased COP by 41.3% and Cooling Exergetic Efficiency by 15.5%, while a 2.5% reduction in the Heat Fraction Factor improved both by 34%. Adjusting absorber temperature and Heat Fraction Factor down by 2.5%, alongside a 2.5% rise in generator temperature, resulted in a 100.8% increase in COP and a 52.8% boost in Cooling Exergetic Efficiency. These insights provide a solid foundation for future optimisation strategies in real-life absorption chiller systems.
Keywords: absorption machine; primary indicators; non-idealised heat pump absorption machine; primary indicators; non-idealised heat pump

Share and Cite

MDPI and ACS Style

L. Szabó, G. A Novel Approach to Enhancing the Determination of Primary Indicators in Non-Idealised Absorption Chillers. Energies 2024, 17, 4858. https://doi.org/10.3390/en17194858

AMA Style

L. Szabó G. A Novel Approach to Enhancing the Determination of Primary Indicators in Non-Idealised Absorption Chillers. Energies. 2024; 17(19):4858. https://doi.org/10.3390/en17194858

Chicago/Turabian Style

L. Szabó, Gábor. 2024. "A Novel Approach to Enhancing the Determination of Primary Indicators in Non-Idealised Absorption Chillers" Energies 17, no. 19: 4858. https://doi.org/10.3390/en17194858

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