Fluorobenzene as new working fluid for high-temperature heat pumps and organic Rankine cycles: Energy analysis and thermal stability test

Energy Conversion and Management, Год журнала: 2024, Номер 321, С. 119023 - 119023

Опубликована: Сен. 16, 2024

Язык: Английский

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Optimizing working fluids for advancing industrial heating performance of compression-absorption cascade heat pump

Applied Energy, Год журнала: 2024, Номер 376, С. 124281 - 124281

Опубликована: Авг. 28, 2024

Язык: Английский

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Multi-objective optimization on combined heat pump and mechanical vapor recompression system for waste heat recovery of offshore wind power converter

Desalination, Год журнала: 2025, Номер unknown, С. 118585 - 118585

Опубликована: Янв. 1, 2025

Язык: Английский

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Refrigerants evaluation and energy performance optimization for a high-temperature carbon dioxide + hydrofluoroolefin / hydrochlorofluoroolefin cascade heat pump dryer with two air heating circuits

Energy Conversion and Management, Год журнала: 2025, Номер 330, С. 119677 - 119677

Опубликована: Фев. 26, 2025

Язык: Английский

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High temperature heat pumps for industrial heating processes using water as refrigerant

Energy, Год журнала: 2024, Номер unknown, С. 133847 - 133847

Опубликована: Ноя. 1, 2024

Язык: Английский

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A Technological Update on Heat Pumps for Industrial Applications

Energies, Год журнала: 2024, Номер 17(19), С. 4942 - 4942

Опубликована: Окт. 2, 2024

It is now widely confirmed by scientific evidence that greenhouse gas emissions must be reduced to counteract the effects of global warming. The production heat for industrial purposes responsible 36.8% world energy-related due widespread use fossil fuels. Heat pumps are a key technology in transition towards more sustainable processes. In this paper, systematic review literature produced last 5 years international journals regarding integration processes presented. Firstly, papers presenting innovative configurations high temperature (HTHP), i.e., delivering temperatures range between 100 °C and 200 °C, suitable many but still under development, reviewed. Then, reporting solutions specific sectors (e.g., distillation, drying, desalination, etc.) analyzed. Finally, about alternative low-GWP refrigerants pumps, both pure compounds mixtures, described. concluded progresses have been realized (2020–2024) identification applications, further research certainly required.

Язык: Английский

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Thermodynamic analysis of a modified cascade high temperature heat pump with zeotropic mixtures for heating production up to 200 °C

Energy Conversion and Management, Год журнала: 2024, Номер 324, С. 119307 - 119307

Опубликована: Ноя. 23, 2024

Язык: Английский

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Solvent Effect on Decomposition Kinetics of Ammonium Carbamate for a Chemical Heat Pump

The Journal of Physical Chemistry C, Год журнала: 2024, Номер 128(42), С. 17859 - 17869

Опубликована: Окт. 10, 2024

Low-grade heat can be efficiently managed and utilized with a chemical pump based on ammonium carbamate (AC). However, the limited knowledge of AC's reaction properties restricts its further development. AC is often dissolved in solvent to enhance circulation. Therefore, effects dissolution solvents decomposition kinetics were investigated. Ethylene glycol (EG) was selected as solvent. It found that AC–EG solutions considered coupling EG evaporation. By decoupling these two processes, respective kinetic parameters computed by using thermal analysis methods. The results decrease both activation energy pre-exponential factors, which ultimately leads slight rate. A coupled rate model for developed. Kinetic predictions AC-based endothermic reactor conducted. demonstrated has excellent instantaneous cooling capability thanks advantageous huge heat, absorption power reaching up 2114.01 W·mol–1 at 85 °C solution 15% concentration, indicating potential efficient low-grade management.

Язык: Английский

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Energy and environment analysis of R1234yf/R245fa cascade air source heat pump system with double ejectors

Energy Conversion and Management, Год журнала: 2024, Номер 325, С. 119404 - 119404

Опубликована: Дек. 18, 2024

Язык: Английский

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Optimizing Working Fluids for Advancing Industrial Heating Performance of Compression-Absorption Cascade Heat Pump

Опубликована: Янв. 1, 2024

Independent cascade hybrid heat pump (ICHHP) can bridge the large temperature gap between low-grade air sources and high-temperature industrial demands. However, working fluids used in previous studies are just considered sufficient as long they perform their functional role. They may not always be most suitable choices different situations, maximum efficiency of ICHHP has been achieved. Ionic liquids (ILs) alternative absorbents have shown potential to enhance performance with unique ability tailor thermal properties by freely combining anions cations. scarcity IL thermodynamic data, underscored limited vapor-liquid equilibrium experiments, impeded full exploitation this inherent advantage. Obviously, lack dedicated research on screening optimal limits performance. To address identified limitations, fluid is recommended work comprehensively evaluating among 100 combinations under conditions. The results indicate that R161 best choice for compression subloop. For absorption subloop, improvement more sensitive anionic species, order influence generally being [OAC]- > [Br]- [OMS]- [TFA]-. Specifically, H2O/[EMIM][OAC]—R161 stands out, improvements coefficient (COP) exergy 9.4% 5.6%, respectively, compared other candidates. Furthermore, it doubles COP relative reference H2O/LiBr—R134a, enhancing perfectibility from 0.41 0.81. Consequently, superior fluid, significantly advancing heating lift

Язык: Английский

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