Results 51 to 60 of about 271 (169)

A Correlation‐Based Prediction Method of Heat Transfer Coefficients for Flooded Evaporation on Enhanced Tubes

Chemie Ingenieur Technik, Volume 97, Issue 1-2, Page 43-50, February 2025.
An enhanced tube which is optimized for pool boiling was examined with the refrigerants R134a, R1234ze(E), and propane. The measured heat transfer coefficient is compared to literature‐based correlations and also the transferability. For a better prediction of the shell‐side heat transfer coefficient a new correlation is proposed.
Marco Möhrle, Jennifer Frick, Christoph Krieger, Karsten Müller   +3 more
wiley   +1 more source

Theoretical Global Warming Impact Evaluation of Medium and High Temperature Heat Pumps Using Low GWP Refrigerants

Applied Sciences, 2021
This study provides a global warming impact analysis of environmentally friendly refrigerants used as replacements for R134a and R245fa. R290, R1234yf, R1234ze(E), R513A and R450A are considered as refrigerants to replace R134a in medium temperature ...
Morteza Ghanbarpour, Adrián Mota-Babiloni, Bassam E. Badran, Rahmatollah Khodabandeh   +3 more
doaj   +1 more source

Performance Investigation of an Automotive Hybrid Air-Conditioning System without and with an Internal Heat Exchanger (IHX) using R1234ze(E) as Substitute for R134a

International Journal of Automotive Science and Technology
In recent years, there is a growing attention drawn to the area of the technology of combined power/refrigeration cycle, due to its high capability in energy saving. In this study, tow automotive hybrid air-conditioning systems without (ORC–ACS) and with
Youcef Maalem, Hakim Madanı
doaj   +1 more source

Energy analysis of a solar driven vaccine refrigerator using environment-friendly refrigerants for off-grid locations

Energy Conversion and Management: X, 2021
In many remote localities, one of the underlying reasons for not receiving life-saving vaccines is the lack of electricity to store the vaccines in the required refrigerated conditions.
Mohammed Raihan Uddin, Shadman Mahmud, Sayedus Salehin, Md Abdul Aziz Bhuiyan, Fahid Riaz, Anish Modi, Chaudhary Awais Salman   +6 more
doaj   +1 more source

Experimental study of an R1234ze(E)/R134a mixture (R450A) as R134a replacement [PDF]

International Journal of Refrigeration, 2015
The authors thankfully acknowledge "Ministerio de Educacion, Cultura y Deporte" for supporting this work through "Becas y Contratos de Formacion de Profesorado Universitario del Programa Nacional de Formacion de Recursos Humanos de Investigacion del ejercicio 2012".
Mota-Babiloni, Adrián, Navarro-Esbrí, Joaquín, Barragán Cervera, Angel, Moles, Fran, Peris, Bernardo   +4 more
openaire   +3 more sources

Performance of Heat Pump Air Conditioning with R1234ze (HFO) as a Refrigerant

Journal of Optimization, Volume 2024, Issue 1, 2024.
The study shows that refrigerants R1234ze (E) and R1234ze (Z), known for their low global warming potential, are likely to become primary choices in heat pump air conditioning for residential and commercial use. The research evaluates the thermodynamic properties of R1234ze (Z) using experimental, thermodynamic, and numerical analyses.
Subhash Kumar, Vaijanath N. Raibhole, Himadri Majumder, Kalapraveen Bagadi   +3 more
wiley   +1 more source

An Experimental Comparison of the Performances of a Small Water-to-Water Heat Pump Working with R1234ze(E) and Its Mixture R515B

Energies
The study presents the results of an experimental investigation aimed at evaluating the performance of a water-to-water heat pump utilising R1234ze(E) and R515B in a drop-in application.
Luca Molinaroli, Andrea Lucchini, Luigi Pietro Maria Colombo   +2 more
doaj   +1 more source

Performance of Transcritical CO2 Air-source Heat Pump Heating System with Mechanical Subcooling Using Zeotropic Refrigerant

Zhileng xuebao, 2021
In this study, a mechanical subcooling transcritical CO2 heat pump heating system using a zeotropic refrigerant is proposed. A thermodynamic model is developed for this system and compared with that using a pure refrigerant. The results indicate that the
代宝民, 张鹏, 刘圣春, 王铭慧, 孙悦桐, 王嘉豪, 徐田雅慧, 肖鹏   +7 more
doaj  

Effects of Heat Transfer Characteristics of R32 and R1234yf with Al2O3 Nanoparticle through U‐Bend Tube Evaporator

Journal of Engineering, Volume 2024, Issue 1, 2024.
This study used the Ansys Fluent® computational fluid dynamics code in conjunction with a volume of fluid multiphase model and phase‐change model to analyze the flow boiling evaporation heat transfer coefficient and flow patterns of R32 and R1234yf with Al2O3 nanoparticle through the U‐bend tube with a curvature ratio for downward‐oriented flow.
Latifur Islam, Dipayan Mondal, Md. Ashraful Islam, Palash Das, Angelo Maiorino   +4 more
wiley   +1 more source

Analyzing the carbon dioxide emissions of R134a alternatives in water-cooled centrifugal chillers using the life cycle climate performance framework

Frontiers in Energy Research, 2023
Introduction: To reduce greenhouse gases, the Kigali Amendment to the Montreal Protocol seeks a phasedown of hydrofluorocarbons. R134a alternatives were analyzed for use in a water-cooled chiller: R450A, R513A, R516A, R1234ze (E), R515A, and R515B ...
Michael O. Akinseloyin, Carter Hall, Emily M. Stallbaumer-Cyr, Jordan A. Morrow, Melanie M. Derby   +4 more
doaj   +1 more source