Performance evaluations of an adsorption-based power and cooling cogeneration system under different operative conditions and working fluids

Yanan Zhao, Zuoqing Luo, Rui Long, Zhichun Liu and Wei Liu

Energy, 2020, vol. 204, issue C

Abstract: In order to harvest low-grade waste heat below 80 °C, we present an alternative adsorption-based power and cooling cogeneration system, which consists of an adsorption-based desalination system for generating concentrated and diluted salt solutions as well as providing cooling power, and a pressure retarded osmosis system for converting the produced salinity gradient energy into electricity. Effects of operation conditions, adsorbents, salt types and solvents are systematically investigated to evaluate the coefficient of performance (COP), electric efficiency, and exergy efficiency of the hybrid system. Results reveal that there exists an optimal desorption temperature leading to the maximum COP and electric efficiency. Larger salt concentration results in upgraded electrical efficiency and exergy efficiency, and degraded COP. Adsorbents with larger relative pressure where the adsorbent achieves half of the maximum absorption uptake and moderate adsorption enthalpy are more appealing. Solvents with high vaporization latent heat and specific heat capacity contribute to COP, however, decrease electrical efficiency and exergy efficiency. Salts rendering a larger osmotic coefficient improve electric and exergy efficiencies, however degrade the COP. When operating at a desorption temperature of 50 °C, the maximum exergy efficiency can reach 33.9%, meanwhile the electric efficiency and COP are 1.63% and 0.87, respectively.

Keywords: Low-grade heat; Power generation; Refrigeration; Cogeneration; Exergy efficiency (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:204:y:2020:i:c:s0360544220311002

DOI: 10.1016/j.energy.2020.117993

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