Performance Analysis of an Ejector-Enhanced Heat Pump System for Low-Temperature Waste Heat Recovery Using UHVDC Converter Valves-Reference-Cited by-同舟云学术

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

Published:2024-07-21 Issue:14 Volume:17 Page:3589
ISSN:1996-1073
Container-title:Energies
language:en
Short-container-title:Energies

Author:

Jin Menghan¹,Zhang Xingjuan²,Zhou Jianhui³,Zhang Limin⁴

Affiliation:

1. State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China

2. School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China

3. State Key Lab of Advance Power Transmission Technology, Beijing 102299, China

4. State Grid Shandong Electric Power Company Construction Company, Jinan 250118, China

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.

Funder

2023 State Grid Corporation of China headquarters technology project

State Grid Economic and Technological Research Institute Co., Ltd.

Publisher

MDPI AG

Link

https://www.mdpi.com/1996-1073/17/14/3589/pdf

Reference19 articles.

1. A New Converter Valve Cooling System Based on Residual Heat Recovery;Zhou;South. Power Syst. Technol.,2019

2. Integrated Design Scheme of External Cooling System of VSC-HVDC Converter Valve and Water-Cooled Transformer;Yang;South. Power Syst. Technol.,2021

3. Fundamental process and system design issues in CO2 vapor compression systems;Kim;Prog. Energy Combust. Sci.,2004

4. Review of recent developments in advanced ejector technology;Elbel;Int. J. Refrig.,2016

5. Harrell, G.S., and Kornhauser, A.A. (August, January 30). Performance tests of a two-phase ejector. Proceedings of the 30th Intersociety Energy Conversion Engineering Conference, Orlando, FL, USA.