Results 41 to 50 of about 739 (173)

A Comprehensive Energy, Exergy, Exergoenvironmental, Economic, and Indoor Environmental Quality Assessment of a Split Air Conditioning System

International Journal of Energy Research, Volume 2026, Issue 1, 2026.
This study presents a comprehensive experimental and multicriteria performance assessment of a 9000 BTU/h split‐type air conditioning system operating with R410A, integrating energy, exergy, environmental (total equivalent warming impact [TEWI] and life cycle climate performance [LCCP]), exergoenvironmental, economic, uncertainty, and indoor ...
Zafer Cingiz, Claire Gao
wiley   +1 more source

Experimental performance studies of small wall room air conditioner for R410A retrofitted with R290

MATEC Web of Conferences, 2018
An original R410A wall room air conditioner was retrofitted with R290 for performance experiments. The R410A wall room air conditioner has a COP and a refrigerating capacity 6.0597and 1929.3 W respectively.
Fajar TK Berkah, Nicolas Dipto I Geraldus   +1 more
doaj   +1 more source

Experimental Comparative Analysis of R‐1234yf, R‐744, and R‐290 Heat Pump Systems for Electric Vehicles

International Journal of Energy Research, Volume 2026, Issue 1, 2026.
As global regulations on carbon dioxide emissions continue to tighten, the automotive industry is increasingly focused on reducing its carbon footprint. Consequently, electric vehicle (EV) refrigerants are being developed to minimize their environmental impact.
Sangmin Lee, Hoseong Lee, Hanbyeol Jeon, Hongseok Choi, Hoseong Lee   +4 more
wiley   +1 more source

Performance Study and Optimization on Alternative Refrigerant R290 in R22 Low Temperature Heat Pump System

Zhileng xuebao, 2019
This study addresses the experimental performance of the alternative refrigerant R290 in the R22 low-temperature heat pump system. Results show that when R22 was directly replaced by R290 in the original system, both the heat exchange and coefficient of ...
Zhang Yun, Liu Cichong, Chen Xiaoning, Li Dawei, Shi Junru, Chen Jiangping   +5 more
doaj  

The Spectrum of Neurologic Phenotypes Associated With NUS1 Pathogenic Variants: A Comprehensive Case Series

Annals of Neurology, Volume 98, Issue 3, Page 561-572, September 2025.
Objective A growing body of evidence indicates a strong genetic overlap between developmental and epileptic encephalopathies (DEEs) and movement disorders. De novo loss‐of‐function variants in NUS1 have been recently identified in DEE cases. Herein, we report a large cohort of cases with pathogenic NUS1 variants and describe their clinical presentation
Sarah M. Brooker, Maria Novelli, Robert Coukos, Neha Prakash, Walaa A. Kamel, Marta Amengual‐Gual, Mathieu Anheim, Giulia Barcia, Tanya Bardakjian, Franciska Baur, Steffen Berweck, Bigna K. Bölsterli, Melanie Brugger, Thomas Cassini, Nicolas Chatron, Brian Corner, Hormos Salimi Dafsari, Jean‐Madeleine de Sainte Agathe, Colin A. Ellis, Kimberly M. Ezell, Cendrine Foucard, Steven J. Frucht, Maria C. Garcia, Deepak Gill, Anne Guimier, Rizwan Hamid, Damià Heine‐Suñer, Peter Herkenrath, Marie Hully, Ioannis U. Isaias, Louis Januel, Chloe Laurencin, Taylor Laut, Alinoe Lavillaureix, Gaetan Lesca, Marion Lesieur‐Sebellin, Luca Magistrelli, Cecilia Marelli, Heather C. Mefford, Bryce A. Mendelsohn, Saadet Mercimek‐Andrews, Claire Miller, Shekeeb S. Mohammad, Francesca Morgante, Sirisha Nandipati, Thomas Opladen, Mahesh Padmanaban, Micaela Pauni, Gianni Pezzoli, Amelie Piton, Francis Ramond, Giulietta M. Riboldi, Christelle Rougeot‐Jung, Fernando Santos‐Simarro, Ingrid E. Scheffer, Naoual Serari, Christine M. Stahl, Ann Stembridge Kung, Susana Tarongí Sanchez, Christel Thauvin‐Robinet, Marianne Till, Christine Tranchant, Christopher Troedson, Thomas F. Tropea, Olivier Vanakker, Patricia Vega, Maxi Leona Wiese, Udo Wieshmann, Laura J. Williams, Thomas Wirth, Michael Zech, Hans Zempel, Emmanuel Roze, Vincenzo Leuzzi, Serena Galosi, Victor S. C. Fung, Gemma Carvill, Dimitri Krainc, Elizabeth Gerard, Niccolò E. Mencacci   +79 more
wiley   +1 more source

Advances in Research and Development of Transcritical CO2 Heat Pump Systems Intergrated With Sustainable Energy and Energy Storage: Applications and Perspectives

IET Smart Energy Systems, Volume 1, Issue 2, Page 168-200, September 2025.
This review focuses on the recent advances in the key research and technology development of transcritical CO2 heat pumps and integrated energy systems including sustainable ‘green’ heating, energy storage, electro‐thermal storage, waste heat recovery and disruptive electrification of renewable energy, combined heating and power, and new hybrid systems.
Lixin Cheng, Hongzhi Li, Haijun Wang
wiley   +1 more source

Experimental Research on Performance of Small Room Air Conditioner with R290

Zhileng xuebao, 2006
The performance of small room air conditioners using R290 as a substitute for R22 was studied in this study.Tests were conducted for a KF-26GW/K air conditioner and a high EER KFR-27GW/E air conditioner.The charging quantity,the lengths of single ...
肖洪海, 张桃, 胡艳
doaj   +2 more sources

Charge Reduction and Performance Analysis of a Heat Pump Water Heater Using R290 as a Refrigerant—A Field Study

Energies
Heat pump water heaters (HPWHs) are a proven technology for water heating that has been commercialized. The adoption of HPWHs for domestic and commercial water heating is growing rapidly because of their superior performance compared with alternative ...
Ahmed Elatar, Joseph Rendall, Jian Sun, Jamieson Brechtl, Kashif Nawaz   +4 more
doaj   +1 more source

Simulation study on performance of a dual-source hybrid heat pump unit with alternative refrigerants

Energy and Built Environment, 2020
To solve the problems of single heat source heat pump systems in severe cold regions, a dual-source hybrid heat pump unit (DSHHPU) is proposed. The mathematical models of the DSHHPU when charging R134a or its alternative refrigerants R32, R290 and R600a ...
Chenguang Bai, Zongwei Han, Haotian Wei, Xiaomei Ju, Xinwei Meng, Qi Fu   +5 more
doaj   +1 more source

Energy and Exergy Efficiency Analysis of an Ejector‐Expansion Refrigeration Cycle Using the Working Fluid R134a and Its Potential Substitutes

Energy Science &Engineering, Volume 13, Issue 5, Page 2389-2400, May 2025.
ABSTRACT This paper proposes an ejector‐expansion refrigeration cycle (EERC) with two evaporating temperatures to recover partial expansion work and greatly reduces the throttling loss of the other expansion valve connected to the evaporator compared with the conventional bievaporator refrigeration cycle (CBEC).
Xiaoqin Liu, Weibin Wang, Jianyong Wang
wiley   +1 more source