Thermodynamic analyses on hybrid sorption cycles for low-grade heat storage and cogeneration of power and refrigeration. (1st December 2019)

• Record Type: Journal Article
• Authors: Godefroy, Alexis; Perier-Muzet, Maxime; Mazet, Nathalie
• Is Part Of: Applied energy. Volume 255(2019)
• Publication Date: 2019-12-01
• Subjects: Thermochemical cycles -- Sorption -- Hybrid cycles -- Power and refrigeration cogeneration -- Thermal storage -- Thermodynamic analysis; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2019.113751
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: New ways of hybridizing thermochemical and power cycles are proposed. Power and cold cogeneration cycles with an intrinsic storage feature are targeted. They valorize low-grade heat sources, e.g. industrial waste heat or solar heat. The thermodynamic analyses screen 5 performance criteria and a set of 103 reactants. The highest energy and exergy efficiencies are respectively 0.61 and 0.40. Abstract: This paper investigates three ways of coupling a solid/gas sorption refrigeration cycle with a Rankine cycle to create innovative hybrid cycles enabling power and refrigeration cogeneration with intrinsic energy storage. A new methodology has been developed to analyze these hybrid cycles and assess five relevant performance criteria (required heat source temperature, energy efficiency, exergy efficiency, power production ratio, and exergy storage density). Screening of 103 reactive salts implemented in the different hybrid cycle configurations highlights the most favorable configuration and reagent to meet the requirements of various applications. Analyses show that energy and exergy efficiencies can reach 0.61 and 0.40, respectively. Exergy storage density ranges from 142 to 640 kJ/kgNH3 when the heat source temperature is increased from 107 °C to 250 °C.