Evaporation heat transfer and pressure drop characteristics of R-290 (propane), R-600 (butane), and a mixture of R-290/R-600 in the three-lines serpentine small-tube bank

Wen, Mao-Yu; Ho, Ching-Yen

doi:10.1016/j.applthermaleng.2005.02.013

Cited by 51 publications

(12 citation statements)

References 12 publications

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“…This is due to the fact that these refrigerants have higher values of the latent heat of vaporization unlike R410a, R404a and R134a. These results are consistent with investigation other researchers [5,8,3,16]. …”

Section: Figure 4 Coefficient Of Performance From Refrigerants Boilisupporting

confidence: 83%

Теплонасосні Технології Та Їх Потенційний Вплив На Проблеми Енергоефективності Та Захисту Навколишнього Середовища В Енергетичному Секторі України

Ostapenko¹,

Стоянов²,

Яковлева³

et al. 2015

Refrigeration Engineering and Technology

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Section: Figure 4 Coefficient Of Performance From Refrigerants Boilisupporting

confidence: 83%

Теплонасосні Технології Та Їх Потенційний Вплив На Проблеми Енергоефективності Та Захисту Навколишнього Середовища В Енергетичному Секторі України

Ostapenko¹,

Стоянов²,

Яковлева³

et al. 2015

Refrigeration Engineering and Technology

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“…(2c), boiling number can be found from, Bo ¼ q h fg G , while X tt is the Martinelli parameter defined by 2c) and (2e), were obtained by an iteration process to minimize the errors between the theoretical calculated HTC and experimental results [30]. The constant values are shown in Table 3.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…Eq. (2b) introduces the relationship between force convective boiling heat transfer of pure refrigerant and the output heat, taken from Wen et al [30] h…”

Section: Thermal Conductivitymentioning

confidence: 99%

Thermal performance analysis of Al2O3/R-134a nanorefrigerant

Mahbubul

Saadah

Saidur

et al. 2015

International Journal of Heat and Mass Transfer

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a b s t r a c tNowadays, nanofluids are being considered as an efficient heat transfer fluid in various thermal applications. Refrigerant-based nanofluids, termed as ''nanorefrigerants'', have the potential to improve the heat transfer performances of refrigeration and air-conditioning systems. This study analyzed the thermophysical properties and their effects on the coefficient of performance (COP) resulted by addition of 5 vol.% Al 2 O 3 nanoparticles into R-134a refrigerant at temperatures of 283-308 K. The analysis has been done for a uniform mass flux through a horizontal smooth tube using established correlations.The results indicate that the thermal conductivity, dynamic viscosity, and density of Al 2 O 3 /R-134a nanorefrigerant increased about 28.58%, 13.68%, and 11%, respectively compared to the base refrigerant (R-134a) for the same temperature. On the other hand, specific heat of nanorefrigerant is slightly lower than that of R-134a. Moreover, Al 2 O 3 /R-134a nanorefrigerant shows the highest COP of 15%, 3.2%, and 2.6% for thermal conductivity, density, and specific heat, respectively compared to R-134a refrigerant. Therefore, application of nanoparticles in refrigeration and air-conditioning systems is promising to improve the performances of the systems.

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“…Some particularly relevant literatures are reviewed here. An experimental investigation of heat-transfer and pressure-drop behavior of R-290, R-600 and R-290/R-600 (55/45 wt%) in the three-line serpentine small-diameter (2.46 mm) tube bank was reported by Wen and Ho [5]. Wen et al [6] measured the boiling heat transfer of R-600a/R-290-oil refrigerant mixtures in serpentine small-diameter U-tubes.…”

Section: List Of Symbolsmentioning

confidence: 97%

Boiling heat transfer and pressure drop of R-600a flowing in the mini-channels with fillisters

Wen

Jang

2014

Heat Mass Transfer

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This study investigated the boiling heat transfer and pressure drop of hydrocarbon refrigerant (R-600a) flowing in six minichannels with fillisters made by electrical-discharge machining. The tests were run at a inlet pressure of 259-293 kPa and under saturated conditions, with the Reynolds number of 4,400-11,000 (i.e. mass flux of 195-487 kg/m 2 s), heat flux of 1,790-8,950 W/m 2 and outlet vapor quality of 0.041-0.25. Effects of the geometries of the fillisters, Reynolds number, heat flux and refrigerant quality on the heat transfer coefficient, friction factor and enhancement performance ratio were examined. The results of the minichannels with fillisters (Tests 1-4) compared to the minichannels without any fillister (Test 5) showed that the heat transfer coefficients increase about 1.05-1.34, 1.11-1.25, 1.23-1.59 and 1.07-1.21-fold, respectively. In addition, the friction factors for Tests 1, 2, 3 and 4 were about 3.3-9.4, 11.2-15.6, 14.7-21.9 and 5.0-6.3 % larger compared to that of the minichannels without any fillisters for Test 5. It was also found that Test 3 had the best enhancement of the performance. In summary, this study strongly suggests the use of fillisters constructed in minichannels. List of symbolsA Heat transfer surface area of a single mini-channel (m 2 ) A c Cross-sectional area of a single mini-channel (m 2 ) B Width of the minichannels (m) D h Hydraulic diameter (m) h Heat transfer coefficient (W/m 2 K) H c Depth of the minichannel (m) H f Depth of the fillister (m) I fg Latent heat (J/kg) k Thermal conductivity (W/m K) L Length of the mini-channels (m) _ m Liquid mass flow rate (kg/s) n Number of fillisters N Number of mini-channels P Pressure (kPa) Pr Prandtl number, Pr ¼ C p' l ' =k ' DP Pressure drop (kPa) Q Actual heat transfer rate to the working fluid (W) q Heat flux (W/m 2 ) T Temperature (K) X Length of the fillister (m) Y Gap between fillister (m) DT Wall superheat, DT ¼ T w À T sat (K) h Enhancement performance ratio, defined in Eq. (7) u Velocity (m/s) l Liquid viscosity (Pa s) q Fluid density (kg/m 3 ) Subscripts f Minichannels with fillisters '

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Evaporation heat transfer and pressure drop characteristics of R-290 (propane), R-600 (butane), and a mixture of R-290/R-600 in the three-lines serpentine small-tube bank

Cited by 51 publications

References 12 publications

Теплонасосні Технології Та Їх Потенційний Вплив На Проблеми Енергоефективності Та Захисту Навколишнього Середовища В Енергетичному Секторі України

Теплонасосні Технології Та Їх Потенційний Вплив На Проблеми Енергоефективності Та Захисту Навколишнього Середовища В Енергетичному Секторі України

Thermal performance analysis of Al2O3/R-134a nanorefrigerant

Boiling heat transfer and pressure drop of R-600a flowing in the mini-channels with fillisters

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