Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer In 2013
DOI: 10.1115/ht2013-17126 View full text |Buy / Rent full text
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Abstract: A study was conducted to experimentally characterize the pool boiling performance of hydrofluorocarbon (HFC)-245fa. The motivation for this research is to characterize the performance of candidate refrigerants for potential use in automotive power electronics two-phase cooling systems. The HFC-245fa pool boiling experiments were conducted using horizontally oriented 1-cm2 heated surfaces to quantify the effects of pressure and a microporous-enhanced coating on heat transfer coefficients and critical heat flux … Show more

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“…Deposited nanolayers influence chemistry and structure of the base surface and modify the force balance at the triple line. All mentioned factors have a crucial impact on characteristics of the heat transfer process during boiling [13,31,48,49]. No effect was found in the condenser section what agrees with previous studies [5,42].…”
Section: Time Averaged Datasupporting
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“…Deposited nanolayers influence chemistry and structure of the base surface and modify the force balance at the triple line. All mentioned factors have a crucial impact on characteristics of the heat transfer process during boiling [13,31,48,49]. No effect was found in the condenser section what agrees with previous studies [5,42].…”
Section: Time Averaged Datasupporting
“…HFO-1234yf's higher reduced pressure contributes to both its higher boiling heat transfer rates and lower boiling incipient superheat. A prior study [14], has shown that for boiling on plain copper surfaces, HFO-1234yf yields higher heat transfer rates as compared with HFC-245fa when evaluated at the same saturation temperature.…”
Section: Resultsmentioning
“…The FEA imposed heat transfer coefficient boundary conditions to simulate boiling heat transfer from enhanced surfaces within the evaporator. In a prior studies [14,17], the boiling heat transfer coefficients for HFC-245fa and HFO-1234yf were experimentally measured with enhanced surfaces (3M microporous boiling enhancement coating) at various saturated temperatures. In those studies, the measured heat transfer coefficient values exceeded 100,000 W/m 2 -K within a wide heat flux range.…”
Section: Advanced Evaporator Conceptmentioning
“…In addition, fouling and contamination of non-condensable gases are avoidable with these volatile working fluids, which are normally supplied in high purity and operate at higher pressures than the atmospheric pressure. Moreno et al [7][8] investigated the boiling characteristics of volatile fluids R1234yf and R245fa on a microporous coating surface for thermosyphons. However, to the best of our knowledge, assessment results of the system performance have not been reported for those fluids.…”
Section: Introductionmentioning