Results 31 to 40 of about 31,202,004 (193)

Vaporizzazione di R1234ze(E) su superfici intensificate [PDF]

, 2022
Sono stati studiati i coefficienti di scambio termico globale e le perdite di carico del refrigerante R1234ze(E) in evaporazione all'interno di un tubo mini microfin di diametro interno 3.4 mm imponendo differenti condizioni operative.
De Caneva, Giovanni
core  

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

Performance Analysis of Solar Combined Ejector-Vapor Compression Cycle Using Environmental Friendly Refrigerants

International Islamic University Malaysia Engineering Journal, 2013
In this study, a new model of a solar combined ejector-vapor compression refrigeration system has been considered. The system is equipped with an internal heat exchanger to enhance the performance of the cycle.
A. B. Kasaeian, S. Daviran
doaj   +1 more source

Climate Change and Refrigerants: Thermodynamic Properties of Low-GWP Fluids for Domestic Applications and Binary Systems for Low-Temperature Options

Applied Sciences, 2020
The most commonly used refrigerants are potent greenhouse gasses that can contribute to climate change. Hydro-Fluoro-Olefins are low Global Warming Potential fluids.
Mariano Pierantozzi, Sebastiano Tomassetti, Giovanni Di Nicola   +2 more
doaj   +1 more source

Iimproving heat dissipation performance of a looped thermosyphon using volatile low-GWP working fluids with a super-hydrophilic boiling surface

Nihon Kikai Gakkai ronbunshu, 2017
With rapid development of electronic devices, their internal heat generation become significantly denser. Accordingly, the thermal management becomes increasingly important for their stable operation.
Chieko KONDOU, Shohei UMEMOTO, Shigeru KOYAMA, Yutaka MITOOKA   +3 more
doaj   +1 more source

Scambio termico bifase di R1234ze(E) in un tubo microalettato di diametro esterno 4 mm [PDF]

, 2022
In questa tesi vengono trattate la condensazione e la vaporizzazione del fluido R1234ze(E) all'interno di un tubo microfin con diametro esterno di 4 mm. Gli obbiettivi principali sono la determinazione del coefficiente di scambio termico e del gradiente ...
Gambarro, Fabio
core  

Scambio termico in vaporizzazione di R1234ze(E)su una superficie nanostrutturata [PDF]

, 2022
Studio della vaporizzazione di R1234ze(E) su una superficie nanostrutturata e su una liscia in condizioni di flow boiling ad una temperatura di saturazione di 30°C. Analisi visiva dei regimi di deflusso.
Vecchi, Riccardo
core  

Vapor Pressure of Hydrofluoroolefins: Critical Review of Experimental Data and Models [PDF]

, 2012
This paper critically reviews vapor pressure data and vapor pressure models for seventeen hydrofluoroolefins, including R1234yf and R1234ze(E), and presents Wagner-type vapor pressure correlations for the seventeen ...
C. Zilio, Brown, J. Steven, Giovanni Di Nicola, S. Brown, Bobbo, Sergio, L. Fedele, Di Nicola, Giovanni, S. Bobbo, J. Steven Brown, Laura Fedele, Polonara, Fabio, Fedele, Laura, Fabio Polonara, Sergio Bobbo, ZILIO, CLAUDIO   +14 more
core   +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
openaire   +2 more sources

Effect of Tube Expansion on Heat Transfer and Pressure Drop Characteristics During Condensation in Micro-Fin Tubes

Frontiers in Energy Research, 2021
Despite of the large number of research dedicated to condensation heat transfer and pressure drop characteristics in pristine micro-fin tubes, experimental investigation on effects of tube expansion have not been reported in the open literature.
Na Liu, Qian Zhao, Zhixiang Lan
doaj   +1 more source