Results 81 to 90 of about 2,030 (213)

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

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

Review of experimental research on supercritical and transcritical thermodynamic cycles designed for heat recovery application [PDF]

, 2019
Supercritical operation is considered a main technique to achieve higher cycle efficiency in various thermodynamic systems. The present paper is a review of experimental investigations on supercritical operation considering both heat-to-upgraded heat and
De Paepe, Michel, Kosmadakis, George, Lecompte, Steven, Manolakos, Dimitris, Ntavou, Erika, Pillai, Aditya, Tchanche, Bertrand   +6 more
core   +2 more sources

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

Ejector refrigeration: A comprehensive review [PDF]

, 2016
The increasing need for thermal comfort has led to a rapid increase in the use of cooling systems and, consequently, electricity demand for air-conditioning systems in buildings.
Besagni, Giorgio, Inzoli, Fabio, Mereu, Riccardo   +2 more
core   +1 more source

Comparison of the Thermodynamic Performance and Total Equivalent Warming Impacts of Various Refrigerants Alternative to R134a in Automobile Air Conditioning Systems for Cooling Mode Operations

International Journal of Automotive Science and Technology
The variations of significant energetic and exergetic performance parameters of automobile air conditioning systems operated in cooling mode for refrigerants R1234yf, R1234ze(e), R152a, R430A and R440A, which can be used as alternatives to R134a, were ...
Murat Hoşöz, Eren Kabak
doaj   +1 more source

Thermodynamic Optimization of Advanced Organic Rankine Cycle Configurations for Geothermal Energy Applications

Energies, 2022
The Organic Rankine Cycle (ORC) is commonly accepted as a viable technology to convert from low to medium temperature geothermal energy into electrical energy.
Nenad Mustapić, Vladislav Brkić, Željko Duić, Toni Kralj   +3 more
doaj   +1 more source

Sizing and parametric optimization of a waste heat to power plant based on transcritical organic Rankine cycle [PDF]

, 2015
peer reviewedIn recent years, the transcritical (also called supercritical) organic Rankine cycle (Trans-ORC) has more and more aroused the attention for power generation from low-temperature heat source thanks to the better thermal matching between the ...
Abdelhamid, Kheiri, Feidt, Michel, Le, Van Long, Vincent, Lemort   +3 more
core  

Influence of Different Refrigerants on Motor Cooling Process and System Performance of Compressor with Gas Bearings

Zhileng xuebao, 2023
Motor cooling is key to the reliable operation of centrifugal refrigeration compressors with gas bearings. A mathematical model of a centrifugal refrigeration compressor with gas bearings was devised, and the influences of different refrigerants on the ...
Liu Yiteng, Gao Yiming, Liu Guangbin, Song Junnan, Gong Jieming   +4 more
doaj  

Improving the economy-of-scale of small organic rankine cycle systems through appropriate working fluid selection [PDF]

, 2016
Organic Rankine cycles (ORC) are becoming a major research area within the field of sustainable energy systems. However, a major challenge facing the widespread implementation of small and mini-scale ORC systems is the economy-of-scale.
Sayma, A. I., White, M.
core   +1 more source