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Performance optimization of an integrated adsorption-absorption cooling system driven by low-grade thermal energy

Citation

Nikbakhti, R and Wang, X and Chan, A, Performance optimization of an integrated adsorption-absorption cooling system driven by low-grade thermal energy, Applied Thermal Engineering, 193 Article 117035. ISSN 1359-4311 (2021) [Refereed Article]

Copyright Statement

Copyright 2021 Elsevier Ltd.

DOI: doi:10.1016/j.applthermaleng.2021.117035

Abstract

The integrated adsorption-absorption system is a novel technology to convert low-temperature waste thermal energy into useful cooling, which substantially improves energy utilization efficiency and lowers environmental pollution. This novel system incorporates the adsorption cycle into the absorption cycle so that the generation/adsorption pressure can be adjusted to enhance the system performance at low-temperature heat sources. In this paper, the thermal characteristics of the integrated system are theoretically evaluated. The optimization of the key parameters (e.g. cycle time, switching time, intermediate pressure and solution concentration) are conducted to achieve the best system performance. Furthermore, different configurations of the integrated system and the effect of the heating and cooling flow arrangements on the system performance are also investigated. The results showed that the coefficient of performance of the proposed system was as high as 0.4 at a heat source temperature of 50 C. As the heat source temperature increased from 50 to 85 C, an optimal intermediate (generation/adsorption) pressure varied gently from 2.36 to 2.16 kPa while the optimal solution concentration increased from 52.4 to 65% to achieve the best system coefficient of performance. The results also showed that the maximum specific cooling power is 193.7 W/kg when the heating and cooling water flow arrangement are both in parallel. In contrast, the lowest specific cooling power is 157.9 W/kg for both heating and cooling water flow arrangements in series. When compared the two different configurations, the cooling capacity and coefficient of performance of the configuration with absorption-cycle as the bottom cycle and adsorption-cycle as the top cycle were about 5 and 15% higher, respectively than those of the configuration with adsorption-cycle as the bottom cycle and absorption-cycle as the top cycle.

Item Details

Item Type:Refereed Article
Keywords:adsorption, absorption, low-grade thermal energy, cooling capacity, coefficient of performance
Research Division:Engineering
Research Group:Mechanical engineering
Research Field:Energy generation, conversion and storage (excl. chemical and electrical)
Objective Division:Energy
Objective Group:Energy storage, distribution and supply
Objective Field:Energy systems and analysis
UTAS Author:Nikbakhti, R (Mr Rasoul Nikbakhti)
UTAS Author:Wang, X (Professor Xiaolin Wang)
UTAS Author:Chan, A (Professor Andrew Chan)
ID Code:144298
Year Published:2021
Deposited By:Engineering
Deposited On:2021-05-10
Last Modified:2021-06-30
Downloads:0

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