Boiling heat transfer and dryout phenomenon of CO2 in a horizontal smooth tube

Prediction of flow boiling heat transfer coefficient for carbon dioxide in minichannels and conventional channels

“…Amongst collected data the criterion of minichannels, i.e., Con > 0.5, is fulfilled only by the research due to Docoulombier et al [25], Wu et al [47] and Yun et al [38,39] for the case of data corresponding to d = 0.98 mm. It can therefore be concluded that in case of carbon dioxide the transition from conventional size channels to minichannels takes place at a channel diameter smaller than 1.5 mm.…”

Steam condensing – liquid CO2 boiling heat transfer in a steam condenser for a new heat recovery system

“…The numerical and experimental overall heat transfer coefficients were evaluated from Eqs. (8) and (11). Fig.…”

“…Knudsen and Jensen [6] included some multipliers to the Shah [7] correlation to fit it to their data. Thome and Ribatski tested the empirical correlation models proposed by Yoon et al [8], Hwang et al [3], Thome and El Hajal [9], and Liu and Winterton [10] to reproduce the wide range of experimental data obtained by Bredesen et al [5], Knudsen and Jensen [6], Yun et al [11], Yoon et al [8], and Koyama et al [12] for macrochannel heat transfer. They concluded that the correlation model proposed by Thome and El Hajal among the four correlation models gave the best fit for the wide range of data [13].…”

The energy efficiency of refrigerants: An assessment based on thermophysical properties

“…This informs the weighting of properties in the evaporation factor in the process of matching the cycle factor sequence with the cop sequence. Yun et al (2003) conducted an experimental study in which the evaporative heat transfer performance of carbon dioxide was compared with that of R134a a synthetic refrigerant. The difference between these two fluids is very clear.…”