Research on the Design of Auxiliary Generator for Enthalpy Reduction and Steady Speed Scroll Expander

Jiongjiong Cai, Peng Ke, Xiao Qu and Zihui Wang
Additional contact information
Jiongjiong Cai: School of Automation and Electrical Engineer, Zhejiang University of Science and Technology, Hangzhou 310023, China
Peng Ke: School of Automation and Electrical Engineer, Zhejiang University of Science and Technology, Hangzhou 310023, China
Xiao Qu: School of Automation and Electrical Engineer, Zhejiang University of Science and Technology, Hangzhou 310023, China
Zihui Wang: School of Automation and Electrical Engineer, Zhejiang University of Science and Technology, Hangzhou 310023, China

Energies, 2022, vol. 15, issue 9, 1-17

Abstract: To help the reverse Brayton cycle cool the refrigerant from 100 K to 50 K, an auxiliary generator, with a housed stator, is studied and optimized, and the influences of weights in the cost- function on the results are discussed. The power demand and adiabatic characteristics of reverse Brayton cycle expansion are analyzed, after which the optimization indexes, including output rated power, efficiency, the air gap between rotor and stator, loss, and volume, are decided. The initial model of the auxiliary generator is then constructed and the parameters to be optimized are also determined. Taking the low loss and sinusoidal back-EMF as the evaluation indexes, the single parameter optimizations of the auxiliary generator are carried out. The co-simulation of the generator and its corresponding driving circuit is investigated, with which the power generation efficiency is calculated. The global optimizations of the generator parameters are carried out using a genetic algorithm. A suitable analytic hierarchy process (AHP) model is proposed, with which a three-order judgment matrix is constructed, and the effects of different weight combinations, in the cost-function, on generator performance are compared. The experimental results show that the output back-EMF amplitude is 28.2 V, which is about 10% smaller than the simulation results; the output power of the auxiliary generator under load is about 3.7 W, meeting the rated demand.

Keywords: cryogenic refrigeration; scroll expander; motor optimization; maximum efficiency output; analytic hierarchy process (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/9/3104/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/9/3104/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:9:p:3104-:d:800952

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().