A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water use
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...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-01-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X24016460 |
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| author | Yantong Li Natasa Nord Huibin Yin Gechuanqi Pan Changhong Wang Tingting Wu Inge Håvard Rekstad |
| author_facet | Yantong Li Natasa Nord Huibin Yin Gechuanqi Pan Changhong Wang Tingting Wu Inge Håvard Rekstad |
| author_sort | Yantong Li |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-7c0d2bf440c94c8f9c6bd2481aeef4d1 |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-7c0d2bf440c94c8f9c6bd2481aeef4d12025-01-08T04:52:40ZengElsevierCase Studies in Thermal Engineering2214-157X2025-01-0165105615A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water useYantong Li0Natasa Nord1Huibin Yin2Gechuanqi Pan3Changhong Wang4Tingting Wu5Inge Håvard Rekstad6Guangdong Provincial Key Laboratory of Multi-energy Complementary Distributed Energy Systems, Dongguan University of Technology, Dongguan, 523808, ChinaDepartment of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim NO-7491, NorwayGuangdong Provincial Key Laboratory of Multi-energy Complementary Distributed Energy Systems, Dongguan University of Technology, Dongguan, 523808, China; Corresponding author.Guangdong Provincial Key Laboratory of Multi-energy Complementary Distributed Energy Systems, Dongguan University of Technology, Dongguan, 523808, China; Corresponding author.School of Integrated Circuits, Guangdong University of Technology, Guangzhou, 510006, ChinaSchool of Integrated Circuits, Guangdong University of Technology, Guangzhou, 510006, ChinaDepartment of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim NO-7491, NorwayCarbon 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.http://www.sciencedirect.com/science/article/pii/S2214157X24016460Model-basedOptimal controlWater-to-waterCO2 heat pumpDomestic hot water |
| spellingShingle | Yantong Li Natasa Nord Huibin Yin Gechuanqi Pan Changhong Wang Tingting Wu Inge Håvard Rekstad A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water use Case Studies in Thermal Engineering Model-based Optimal control Water-to-water CO2 heat pump Domestic hot water |
| title | A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water use |
| title_full | A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water use |
| title_fullStr | A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water use |
| title_full_unstemmed | A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water use |
| title_short | A study of optimal control approaches of water-to-water CO2 heat pump for domestic hot water use |
| title_sort | study of optimal control approaches of water to water co2 heat pump for domestic hot water use |
| topic | Model-based Optimal control Water-to-water CO2 heat pump Domestic hot water |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X24016460 |
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