Performance Analysis of an Ejector-Enhanced Heat Pump System for Low-Temperature Waste Heat Recovery Using UHVDC Converter Valves

Menghan Jin, Xingjuan Zhang (), Jianhui Zhou and Limin Zhang
Additional contact information
Menghan Jin: State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
Xingjuan Zhang: School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
Jianhui Zhou: State Key Lab of Advance Power Transmission Technology, Beijing 102299, China
Limin Zhang: State Grid Shandong Electric Power Company Construction Company, Jinan 250118, China

Energies, 2024, vol. 17, issue 14, 1-16

Abstract: This article proposes a heating method based on heat pump technology to address the large amount of low-grade waste heat generated by a certain type of ultra-high voltage direct current (UHVDC) converter valve. Thermal performance calculations for two systems, a basic vapor compression heat pump system (BVCHPS) based on thermal expansion valve throttling and an ejector-enhanced heat pump system (EEHPS) are analyzed. The research results show that the EEHPS exhibits superior COP and exergy efficiency when generating hot water above 80 °C using a heat source below 50 °C. Additionally, mathematical modeling analysis identifies optimal structural parameters such as nozzle throat diameter, throat area ratio, and nozzle outlet diameter for the ejector in its design state. The low-temperature waste heat recovered from the UHVDC converter valves can be further used in engineering applications such as heating, refrigeration, seawater desalination, and sewage treatment.

Keywords: UHVDC converter valves; waste heat utilization; ejector-enhanced heat pump system; gas–liquid ejector; exergy analysis (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: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/14/3589/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/14/3589/ (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:17:y:2024:i:14:p:3589-:d:1439779

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 ().