Performance characteristics map using exergy analysis of reverse Brayton cryocooler for HTS applications: Selection, Optimization, Design and Operational guidelines. (March 2020)

• Record Type: Journal Article
• Authors: Dhillon, Aman Kumar; Ghosh, Parthasarathi
• Is Part Of: Cryogenics. Volume 106(2020)
• Publication Date: 2020-03
• Subjects: Thermodynamic optimization -- Refrigeration technology -- Reverse Brayton -- Exergy analysis -- HTS devices; Low temperature engineering -- Periodicals; Low temperature research -- Periodicals; 536.56
• DOI: 10.1016/j.cryogenics.2019.103024
• Languages: English
• ISSNs: 0011-2275

Abstract

Highlights: Rationalized selection of optimization parameters from process parameters. New hybrid optimization approach based on optima and insight on a system. Reduce computational time from 3 h to 24 min and improve performance by 34.6%. Operational and design guidelines for a reverse Brayton cryocooler. Significant impact of design parameters on optimum process parameters. Abstract: In this paper, investigation has been carried out to find a guideline for selection of optimum process parameters such as the operating pressure and pressure ratio of an RBC for given loads at different temperature for HTS cables. Grid search method-based optimisation technique has been adopted where the exergetic efficiency has been considered as the objective function and the operating pressure and pressure ratio have been adopted as the primary variables. The effects of the change in the primary variables on the other process parameters such as mass flow rate, turbine power output, compressor power input, heat exchangers UA etc. have been investigated. Studies have been made to find out the effects of the design variables such as compressor efficiency, turbine efficiency, heat exchanger minimum approach etc. on the optimum values of the pressure ratio and operating pressure. The applications of the above findings have been elucidated with an example of selection of the process parameters of RBC for a given load conditions for HTS cables and utilized to develop a new simple and effective optimization approach. The findings and methodology may be adopted for RBC used in various other applications by researcher, process designer and operational engineer.