Abstract
High temperature heat pumps (HTHP) are an effective technology for generation of industrial process heat and recovery of waste heat. This paper investigates the performance of HTHP, optimally integrated with PY /T, waste heat recovery, and energy storage in industrial multi-energy systems. Because of the time-varying waste heat (heat source) and process heat (heat demand), as well as the intermittency of renewable energy and integration of energy storage, dynamic models of HTHP are required for performance simulation of industrial multi-energy systems. The dynamic models are developed in Matlab using a component-oriented approach. The compressors are modeled with performance characteristics data. The heat exchangers (evaporators and condensers) are modeled using the lumped parameter and variational approach. The systems work with different refrigerants which properties are calculated using Coolprop. Assessment of the HTHP design and operation performance characteristics is presented. The influence of different operating conditions on the performance characteristics is investigated. The results show high energy efficiency and high operational flexibility of HTHP in industrial multi-energy systems. High COP (5-12) is obtained depending on temperature lift, compressor efficiency, evaporator and condenser operating conditions, and heat pump cycle. A HTHP based on a cascade system topped with a mechanical vapor compression (MVC) system for steam generation is proposed for application in the dairy industry. The HTHP is further integrated with thermal energy storage for the temporal decoupling of thermal energy flows. Dynamic simulations show that the system can supply the heat demand with constantly high COP of the first cascade, second cascade, and the MVC above 5. Successful operation strategies result in alleviating electricity consumption peaks, locally balancing the PV electricity generation and HTHP consumption, and matching the waste heat availability and process heat demand in the time domain. The HTHP achieves efficient, clean, and sustainable electrification of the industrial thermal sector and represents an important asset of distributed integrated multi-energy systems.
| Original language | English |
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| Title of host publication | International Refrigeration and Air Conditioning Conference |
| Publication status | Published - 21 Oct 2024 |
| Event | 20th International Refrigeration and Air Conditioning Conference, IRACC 2024 - Purdue University, West Lafayette, United States Duration: 15 Jul 2024 → 18 Jul 2024 Conference number: 20 |
Conference
| Conference | 20th International Refrigeration and Air Conditioning Conference, IRACC 2024 |
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| Abbreviated title | IRACC |
| Country/Territory | United States |
| City | West Lafayette |
| Period | 15/07/24 → 18/07/24 |
Keywords
- High temperature heat pumps
- Waste heat recovery
- COP
- Operational flexibility
- Dynamic models