A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water use

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2024-12-09 DOI:10.1016/j.csite.2024.105615

Yantong Li, Natasa Nord, Huibin Yin, Gechuanqi Pan, Changhong Wang, Tingting Wu, Inge Håvard Rekstad

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引用次数: 0

Abstract

Carbon dioxide (CO2) heat pumps are not causing ozone layer depletion, while offering high temperature water. Typical control (TC) can realize normal operation of water-to-water CO2 heat pump. However, the approach for developing model-based optimal control (MC) for further improving the performance of water-to-water CO2 heat pump is still lacking. Hence, this study presents MC approaches for water-to-water CO2 heat pump. The developed model-based controller was composed of the optimization strategy and system models. The objective of optimization strategy was to maximize system coefficient of performance by identifying optimal setpoint values of discharge pressure and outlet water temperature at the gas cooler side. System models of compressor power and heat rate at the gas cooler side were established using large amount of data from virtual CO2 heat pump. The reliability of virtual CO2 heat pump was validated by experimental data. Results of case studies demonstrated that the system coefficient of performance with MC could be improved by 7.8 %–14.6 % in comparison with that with TC. This study therefore gave a guideline for optimal control of water-to-water CO2 heat pump.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.