Results 41 to 50 of about 1,918 (181)
Flow visualization of R1234ze(E) in a 0.643 mm microchannel tube
International Journal of Heat and Mass Transfer, 2019 Abstract This paper presents the discussion of regimes of two-phase flow of R1234ze(E) in a 24-port microchannel tube with average hydraulic diameter of 0.643 mm, obtained by visualization. The experiment is conducted in the same facility in the previous work for R32 (Li and Hrnjak, 2019). The conditions cover mass flux from 50 to 225 kg m−2 s−1. The
Houpei Li, Pega Hrnjak
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Organic rankine cycle modelling and the ORCmKit library: analysis of R1234ze(Z) as drop-in replacement of R245fa for low-grade waste heat recovery [PDF]
, 2016 Due to the wide interest in organic Rankine cycles (ORCs) as a sustainable technology and the importance of numerical analyses and optimization procedures while considering such systems, we created a dedicated open-source library named “ORC modelling Kit”
De Paepe, Michel +5 more
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Experimental analysis of R-450A and R-513A as replacements of R-134a and R-507A in a medium temperature commercial refrigeration system [PDF]
, 2017 This work presents the experimental evaluation of R-513A (GWP = 573) and R-450A (GWP = 547) as R-134a (GWP = 1301) drop-in replacements and as R-507A (GWP = 3987) retrofits in a commercial direct expansion refrigeration system for medium temperature ...
Cabello López, Ramón +4 more
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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 +3 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 +6 more
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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 +3 more
wiley +1 more source
Pool boiling of R515A, R1234ze(E), and R1233zd(E) on a reentrant cavity surface
International Journal of Heat and Mass Transfer, 2020 Abstract This paper quantifies the pool boiling performance of R515A, R1234ze(E), and R1233zd(E) on a flattened, horizontal Turbo-ESP surface for air-conditioning. The measured boiling curve for R515A had roughly a 14 % larger heat flux than that of R1234ze(E) for heat fluxes greater than 45 kWm−2. For heat fluxes between 14 kWm−2 and 85 kWm−2, R515A
M.A. Kedzierski, L. Lin
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Experimental study of an R1234ze(E)/R134a mixture (R450A) as R134a replacement [PDF]
International Journal of Refrigeration, 2015 This work presents an experimental analysis of a non-flammable R1234ze(E)/R134a mixture (R450A) as R134a drop-in replacement. While R134a has a high GWP value (1430), the R450A GWP is only 547. The experimental tests are carried out in a vapour compression plant equipped with a variable-speed compressor.
Mota-Babiloni, Adrián +4 more
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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 +4 more
wiley +1 more source
Investigation on the performance of air source heat pump system with new environment friendly refrigerants for a low carbon building [PDF]
, 2016 Energy is an important development factor. It is consumed in different format from different sources in daily human activities. Solar energy, as the most fundamental renewable energy resource, serves in a clean, domestic and environmentally friendly way
Cuce, E, Ding, Y, Lu, C, Riffat, S
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