Abstract
Ultra-low temperature district heating (ULTDH) systems were proposed to operate at lower temperatures in combination with booster heat pumps working from 313 K to 333 K. This can increase the system efficiency and enable the exploitation of renewable heat sources, but only based on the proper design for system boundary conditions. The techno-economic analysis of ULTDH systems revealed that the seasonal coefficient of performance of booster heat pumps should be sufficiently high to ensure the competitiveness of ULTDH systems. We study the potential of a novel magnetocaloric heat pump integrated into a domestic hot water application based on ULTDH systems. The magnetocaloric heat pump is based on the active magnetic regenerator (AMR) system that uses the reversible magnetocaloric effect of a solid-state refrigerant with no
global warming potential to build a heating/cooling cycle. The solid refrigerant can be layered with different magnetic phase-change temperatures to provide a good temperature match between the user water stream and the refrigerant flow. The heating capacity can be tuned in a wide range by combinatorial control of frequency, fluid flow rate, blow fraction and offset fraction. An experimentally validated model with an average error of ~9.2% was used to study the partial load operation. A COP improvement of 68% was obtained at a partial load of 47.4% by simultaneously tuning the frequency and fluid flow rate. Important factors for the magnetocaloric heat pump integration in the ULTDH system were identified.
global warming potential to build a heating/cooling cycle. The solid refrigerant can be layered with different magnetic phase-change temperatures to provide a good temperature match between the user water stream and the refrigerant flow. The heating capacity can be tuned in a wide range by combinatorial control of frequency, fluid flow rate, blow fraction and offset fraction. An experimentally validated model with an average error of ~9.2% was used to study the partial load operation. A COP improvement of 68% was obtained at a partial load of 47.4% by simultaneously tuning the frequency and fluid flow rate. Important factors for the magnetocaloric heat pump integration in the ULTDH system were identified.
| Original language | English |
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| Title of host publication | Proceedings of ECOS 2022: 35rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems |
| Publication status | Accepted/In press - 1 Jul 2022 |
| Externally published | Yes |
| Event | 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2022 - DGI-Byen, Copenhagen, Denmark Duration: 3 Jul 2022 → 7 Jul 2022 Conference number: 35 https://ecos2022.dtu.dk/ |
Conference
| Conference | 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2022 |
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| Abbreviated title | ECOS 2022 |
| Country/Territory | Denmark |
| City | Copenhagen |
| Period | 3/07/22 → 7/07/22 |
| Other | The purpose of the conference is for participants to present new research results and exchange views on performance, economics, and environmental impact of energy systems, their design and possible advancements. Submission of applied and fundamental science papers are encouraged. We cordially welcome you to submit papers from all over the world. We expect that you will enjoy a fruitful week through the conference, where we look forward to host the ECOS community in Denmark for the second time. |
| Internet address |