Condensation heat transfer coefficients of R1234yf on plain, low fin, and Turbo-C tubes

Park, Ki-Jung; Kang, Dong Gyu; Jung, Dongsoo

doi:10.1016/j.ijrefrig.2010.06.010

Cited by 51 publications

(6 citation statements)

References 4 publications

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“…Del Col et al [4] attributed the lower condensation heat transfer coefficients of HFO-1234yf to its lower thermal conductivity (18% lower than HFC-134a at a saturation temperature of 40°C). These findings differ from those of Park et al [6], who reported minimal differences in the condensation heat transfer coefficients of HFO1234yf and HFC-134a. More recently, Tibirica et al [7] reported almost identical flow boiling performance for HFO-1234ze(E) and HFC-134a.…”

Section: Introductioncontrasting

confidence: 99%

Pool Boiling Heat Transfer Characteristics of HFO-1234yf on Plain and Microporous-Enhanced Surfaces

Moreno¹,

Narumanchi²,

King

2013

Journal of Heat Transfer

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This study characterizes the pool boiling performance of HFO-1234yf (hydrofluoroolefin 2,3,3,3-tetrafluoropropene). HFO-1234yf is a new, environmentally friendly refrigerant likely to replace HFC-134a in automotive air-conditioning systems. Pool boiling experiments were conducted at system pressures ranging from 0.7 to 1.7 MPa using horizontally oriented 1-cm^ heated surfaces. Test results for pure (oil-free) HFO-1234yf and HFC-I34a were compared. The results showed that the boiling heat transfer coefficients of HFO-1234yf and HFC-134a were nearly identical at lower heat fluxes. HFO-1234yf yielded lower heat transfer coefficients at higher heat fluxes and lower critical heat flux (CHF) values as compared with HFC-134a. To enhance boiling heat transfer, a copper microporous coating was applied to the test suifaces. The coating enhanced both the boiling heat transfer coefficients and CHF for both refrigerants at all tested pressures. Increasing pressure decreased the level of heat transfer coefficient enhancements and increased the level of CHF enhancements. The experimental data were then used to develop a correlation for predicting the CHF for a smooth/plain heated surface.

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Section: Introductioncontrasting

confidence: 99%

Pool Boiling Heat Transfer Characteristics of HFO-1234yf on Plain and Microporous-Enhanced Surfaces

Moreno¹,

Narumanchi²,

King

2013

Journal of Heat Transfer

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“…At a system temperature of 75°C and with HFO-1234yf, the condenser frontal size requirements are estimated to be about 400 cm 2 (20 cm × 20 cm) with a maximum T j of about 125°C. HFC-134a may also be considered in this case because it is a refrigerant currently used in automotive systems and because prior studies [17][18][19][20] have shown that its heat transfer performance (boiling and condensation) similar, if not slightly better than, that of HFO-1234yf. Operating at higher system temperatures has advantages because it allows for a more compact condenser.…”

Section: Discussionmentioning

confidence: 99%

Passive two-phase cooling for automotive power electronics

Moreno

Jeffers

Narumanchi

et al. 2014

2014 Semiconductor Thermal Measurement and Management Symposium (SEMI-THERM)

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Experiments were conducted to evaluate the use of a passive two-phase cooling strategy as a means of cooling automotive power electronics. The proposed cooling approach utilizes an indirect cooling configuration to alleviate some reliability concerns and to allow the use of conventional power modules. An inverter-scale proof-of-concept cooling system was fabricated and tested using the refrigerants hydrofluoroolefin HFO-1234yf and hydrofluorocarbon HFC-245fa. Results demonstrated that the system can dissipate at least 3.5 kW of heat with 250 cm 3 of HFC-245fa. An advanced evaporator concept that incorporates features to improve performance and reduce its size was designed. Simulation results indicate the concept's thermal resistance can be 58% to 65% lower than automotive dual-side-cooled power modules. Tests were also conducted to measure the thermal performance of two air-cooled condensers-plain and rifled finned tube designs. The results combined with some analysis were then used to estimate the required condenser size per operating conditions and maximum allowable system (i.e., vapor and liquid) temperatures.

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“…Ki Jung et. al [13], conducted an experiment for a comparative study on R123a and R1234yf in plain, fin, and Turbo C tubes. They found that the R1234yf has the capacity to replace the R134.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of InTube Condensation of HFO-1234yf

N P,

Sadashive Gowda,

Narasimham

et al. 2023

jmmf

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An increase in global warming potential and other environmental concerns are demanding new environmentally friendly refrigerants. For effective performance of refrigeration and air conditioning system condenser design play a vital role. Experiments were conducted to study the condensation of R1234yf refrigerant inside a copper tube of 8.4 mm in diameter and 750 mm in length. The heat transfer coefficients of refrigerant were calculated against mass flux varying from 150–300 kg/m2 s, quality of refrigerant 0.3 to 0.8, and saturated temperature 30 and 500 C. The experimental heat transfer coefficients were compared to the heat transfer coefficients by the recent MM Sha correlation. The experimental results are in good agreement with an absolute mean deviation of nearly 20% with the MM Sha heat transfer coefficient.

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Condensation heat transfer coefficients of R1234yf on plain, low fin, and Turbo-C tubes

Cited by 51 publications

References 4 publications

Pool Boiling Heat Transfer Characteristics of HFO-1234yf on Plain and Microporous-Enhanced Surfaces

Pool Boiling Heat Transfer Characteristics of HFO-1234yf on Plain and Microporous-Enhanced Surfaces

Passive two-phase cooling for automotive power electronics

Experimental Investigation of InTube Condensation of HFO-1234yf

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