Results 21 to 30 of about 2,030 (213)

Waste heat recovery of the hydrogen–water mixture from high‐temperature water electrolysis by cascade heat pump for steam generation

Energy Science &Engineering, Volume 11, Issue 9, Page 3070-3081, September 2023., 2023
A cascade heat pump is used to absorb latent heat of steam condensation. After twice compressions, the temperature of the working fluid is sufficiently high to vaporize liquid water. The heat pump fully utilizes thermal energy instead of direct electric heating, saving 65% of power consumption. Abstract Waste heat recovery is common in high‐temperature
Zhicong Fang, Zhiguang Chen, Zekun Yang, Shuhao Zhang   +3 more
wiley   +1 more source

Analysis of low‐temperature pumped thermal energy storage systems based on a transcritical CO2 charging process

Energy Science &Engineering, Volume 11, Issue 9, Page 3289-3306, September 2023., 2023
In this work, pumped thermal energy storage systems based on a transcritical CO2 charging process are investigated. A two‐zone water storage tank with a storage temperature of 115°C is used as thermal energy storage. For discharge, an Organic Rankine Cycle and, alternatively, a transcritical CO2 heat engine are investigated.
Jonas Bodner, Josefine Koksharov, Frank Dammel, Peter Stephan   +3 more
wiley   +1 more source

Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling Mechanisms

Applied Sciences, 2022
A comparative analysis of the flow boiling characteristics of R450A, R515B, and R1234ze(E) inside a 7.0 mm OD microfin tube was performed. The mass velocity was explored from low values, starting from 50 kg m−2 s−1, up to 400 kg m−2 s−1, and the heat ...
Yuce Liu, Luisa Rossetto, Andrea Diani
doaj   +1 more source

Mixture Condensation of Ethanol/Water and Ethanol/Siloxane in a Vertical Double Pipe

Chemie Ingenieur Technik, Volume 95, Issue 5, Page 724-731, May 2023., 2023
Experimental data is presented for mixture and pure fluid condensation within a wide composition range. Influential parameters for the heat transfer deterioration of mixtures are discussed. The results enable an explicit calculation of condensation heat transfer coefficients depending on the mixture composition.
Conrad Zimmermann, Nico Lubos, Cagatay Necati Dagli, Stephan Kabelac   +3 more
wiley   +1 more source

Investigation of the Interactions between Refrigerant, Flowsheet, and Compressor in Residential Heat Pumps

Energy Technology, Volume 11, Issue 2, February 2023., 2023
The interdependencies of the refrigerant, flowsheet, compressor, and operating point are evaluated for residential heat pumps. The study shows that the optimal refrigerant strongly depends on the flowsheet and the compressor modeling approach.
Christoph Höges, Dennis Roskosch, Jona Brach, Christian Vering, Valerius Venzik, Dirk Müller   +5 more
wiley   +1 more source

Drop-In Replacement of R134a in a Household Refrigerator with Low-GWP Refrigerants R513A, R516A, and R1234ze(E)

Energies, 2023
This study proposes the experimental evaluation of alternative refrigerants with low global warming potentials (GWPs) such as R1234ze(E), R513A, and the mixture R516A as a drop-in replacement for R134a in a domestic refrigerator with a volumetric ...
Juan M. Belman-Flores, Yonathan Heredia-Aricapa, Juan J. García-Pabón, Vicente Pérez-García, César G. Pérez-Reguera   +4 more
doaj   +1 more source

Parametric Evaluation of the Flow Boiling Heat Transfer Properties of R22 and R407c inside Horizontal Microfin Tube

International Journal of Energy Research, Volume 2023, Issue 1, 2023., 2023
The flow boiling heat transfer performance of R22 and R407c, in a microfin tube with a helix angle of 22° and an apex angle of 48°, was evaluated in a study. The study is aimed at investigating the impact of heat flux, mass flux, saturation temperature, and vapor quality on the heat transfer coefficient during flow boiling.
Sandipan Deb, Neeraj Kumar Vidhyarthi, Sagnik Pal, Ajoy Kumar Das, Debabrata Barik, Nagaraj Nandihalli   +5 more
wiley   +1 more source

Performance Improvement of OTEC‐ORC and Turbine Based on Binary Zeotropic Working Fluid

International Journal of Chemical Engineering, Volume 2023, Issue 1, 2023., 2023
In this paper, the composition of binary nonazeotropic working fluids is explored from the perspective of improving OTEC‐ORC efficiency, and the turbine is designed to accommodate with the working fluid. It is found that the OTEC‐ORC using a R152a/R32 mixture as the working fluid is significantly higher than the OTEC‐ORC thermal efficiency and system ...
Qingfen Ma, Jie Huang, Zezhou Gao, Hui Lu, Hongfeng Luo, Jingru Li, Zhongye Wu, Xin Feng, Maciej Jaskulski   +8 more
wiley   +1 more source

Analysis of the Potential of Solar‐Assisted Heat Pumps: Technical, Market, and Social Acceptance Aspects

Solar RRL, Volume 6, Issue 8, August 2022., 2022
Solar‐assisted heat pumps have the potential to increase the share of renewables in the energy systems and the flexibility of smart grids. An assessment covering technical, economic, and social aspects is given to allow a holistic overview on the application of such systems.
Valeria Palomba, Giuseppe E. Dino, Andrea Frazzica   +2 more
wiley   +1 more source

Fundamentals, Thermophysical Properties, and Heat Transfer Characteristics of Nanorefrigerants: A Review

Journal of Nanomaterials, Volume 2022, Issue 1, 2022., 2022
Cooling applications that utilize latent heat property of fluids involve large heat transfer and throw more space for energy conservative research studies. Heating ventilation air‐conditioning and refrigeration systems, which have now grown as an integral part in human life, circulate refrigerants and necessitate developments to become energy‐efficient.
M. Feroskhan, T. Venugopal, Naif Mana Almakayeel, T. M. Yunus Khan, Saleh Alghamdi, Ali Saeed Almuflih, N. Gobinath, Samson Jerold Samuel Chelladurai   +7 more
wiley   +1 more source