Experimental investigation on boiling heat transfer and pressure drop of R245fa in a horizontal micro-fin tube

Abstract

An experimental investigation on the boiling heat transfer and frictional pressure drop of R245fa in a 7 mm horizontal micro-fin tube was performed. The results show that in terms of flow boiling heat transfer characteristics, boiling heat transfer coefficient (HTC) increases with mass velocity of R245fa, while it decreases with the increment of saturation temperature and heat flux. With the increase of vapor quality, HTC has a maximum and the corresponding vapor quality is about 0.4, which varies with the operating conditions. When vapor quality is larger than the transition point, HTC can be promoted more remarkably at higher mass velocity or lower saturation temperature. Among the four selected correlations, KANDLIKAR correlation matches with 91.6% of experimental data within the deviation range of ±25%, and the absolute mean deviation is 11.2%. Also, in terms of frictional pressure drop characteristics of flow boiling, the results of this study show that frictional pressure drop increases with mass velocity and heat flux of R245fa, while it decreases with the increment of saturation temperature. MULLER-STEINHAGEN-HECK correlation shows the best prediction accuracy for frictional pressure drop among the four widely used correlations. It covers 84.1% of experimental data within the deviation range of ±20%, and the absolute mean deviation is 10.1%.

Keywords

boiling heat transfer / frictional pressure drop / prediction correlations / micro-fin tube / R245fa fluid

References

[1] TchanaheB F, LamnrinosG, FrangoudakisA. Low-grade heat conversion into power using organic Rankine cycles-a review of various applications [J]. Renewable and Sustainable Energy Reviews, 2011, 15(8): 3963-3979

[2] WangZ-q, ZhouN-j, Guojing. Fluid selection and parametric optimization of organic Rankine cycle using low temperature waste heat [J]. Energy, 2012, 40(1): 107-115

[3] XiaX-x, WangZ-q, HuY-h, ZhouN-jun. A novel comprehensive evaluation methodology of organic Rankine cycle for parameters design and working fluid selection [J]. Applied Thermal Engineering, 2018, 143: 283-292

[4] SunW-q, YueX-y, WangY-h, CaiJ-ju. Energy and exergy recovery from exhaust hot water using organic Rankine cycle and a retrofitted configuration [J]. Journal of Central South University, 2018, 25: 1464-1474

[5] YangF-b, ZhangH-g, SongS-s, BeiC, WangH-j, WangE-hua. Thermoeconomic multi-objective optimization of an organic Rankine cycle for exhaust waste heat recovery of a diesel engine [J]. Energy, 2015, 93(2): 2208-2228

[6] KangS H. Design and experimental study of ORC (organic Rankine cycle) and radial turbine using R245fa working fluid [J]. Energy, 2012, 41(1): 514-524

[7] SafarianS, AramounF. Energy and exergy assessments of modified organic rankine cycles (ORCs) [J]. Eenrgy Report, 2015, 1: 1-17

[8] TibiricaC B, RibatskiG. Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube [J]. International Journal of Heat and Mass Transfer, 2010, 53(11): 2459-2468

[9] LiuZ, WintertonR H S. A general correlation for saturated and subcooled flow boiling in tubes and annuli, based on a nucleate pool boiling equation [J]. International Journal of Heat and Mass Transfer, 1991, 34(11): 2759-2766

[10] ChamayR, BonjourJ, RevellinR. Experimental investigation of R245fa flow boiling in minichannels at high saturation temperatures: Flow patterns and flow pattern maps [J]. International Journal of Heat and Fluid Flow, 2014, 46(4): 1-16

[11] GungorK E, WintertonR H S. Simplified general correlation for saturated flow boiling and comparisons with data [J]. Chemical Engineering Research and Design, 1987, 65(2): 148-156

[12] Pike-WilsonE A, KarayannisT G. Flow boiling of R245fa in 1.1 mm diameter stainless steel, brass and copper tube [J]. Experimental Thermal and Fluid Science, 2014, 59: 166-183

[13] RevellinR, ThomeJ R. Experimental investigation of R134a and R245fa two-phase flow in microchannels for different flow conditions [J]. International Journal of Heat and Fluid Flow, 2007, 28(1): 63-71

[14] Muller-SteinhagenH, HeckK. A simple friction pressure drop correlation for two-phase flow in pipes [J]. Chemical Engineering and Processing Process Intensification, 1986, 20(6): 297-308

[15] SandlerS, ZajaczkowskiB, KrolickiZ. Review on flow boiling of refrigerants R236fa and R245fa in mini and micro channels [J]. International Journal of Heat and Mass Transfer, 2018, 126: 591-617

[16] SaitohS, DaigujiH, HiharaE. Correlation for boiling heat transfer of R134a in horizontal tubes including effect of tube diameter [J]. International Journal of Heat and Mass Transfer, 2007, 50(25): 5215-5225

[17] DianiAndrea, MancinSimone, RossettoLuisa. R1234ze(E) flow boiling inside a 3.4 mm ID microfin tube. International Journal of Refrigeration, 2014, 47: 105-119

[18] DianiA, MancinS, RossettoL. R1234ze(E) flow boiling inside a 3.4 mm ID microfin tube [J]. International Journal of Refrigeration, 2014, 47: 105-119

[19] LallemM, BranescuC, HaberschillP. Local heat transfer coefficients during boiling of R22 and R407C in horizontal smooth and micro-fin tubes [J]. International Journal of Refrigeration, 2001, 24(1): 57-72

[20] WuX-m, ZhuY, TangY-jie. New experimental data of CO₂ flow boilingin mini tube with micro fins of zero helix angle [J]. International Journal of Refrigeration, 2015, 59: 281-294

[21] CuiW-z, LiL-j, XinM-d, JenT C. A heat transfer correlation of flow boiling in micro-finned helically coiled tube [J]. International Journal of Heat and Mass Transfer, 2006, 49(17): 2851-2858

[22] JiangG-b, TanJ-t, NianQ-x, TaoW-qing. Experimental study of boiling heat transfer in smooth/micro-fin tubes of four refrigerants [J]. International Journal of Heat and Mass Transfer, 2016, 98(7): 631-642

[23] HanX-h, LiP, YuanX-r, WangQ, ChenG-ming. The boiling heat transfer characteristics of the mixture HFO-1234yf/oil inside a micro-fin tube [J]. International Journal of Heat and Mass Transfer, 2013, 67(12): 1122-1130

[24] ZhangX-y, ZhangJ, JiH-w, ZhaoD-yu. Heat transfer enhancement and pressure drop performance for R417A flow boiling in internally grooved tubes [J]. Energy, 2015, 86(15): 446-454

[25] PadovanA, DslcoD, RossettoL. Experimental study on flow boiling of R134a and R410A in a horizontal microfin tube at high saturation temperatures [J]. Applied Thermal Engineering, 2011, 31(17): 3814-3826

[26] CAVALLINI A, DEL COL D, ROSSETTO L. Flow boiling inside microfin tubes: Prediction of the heat transfer coefficient [C]// Proceedings of ECI International Conference on Boiling Heat Transfer. Spoleto, Italy, 2006.

[27] AkhavanB A, MohseniS G, RazavinasabS M. Evaporation heat transfer of R-134a inside a micro-fin tube with different tube inclinations [J]. Experimental Thermal and Fluid Science, 2011, 35(6): 996-1001

[28] ChiouC-b, LuD-c, ChenC-cong. Heat transfer correlations of forced convective boiling for pure refrigerants in micro-fin tubes [J]. Applied Thermal Engineering, 2011, 31(5): 820-826

[29] ColomboL P M, LucchiniA, MuzzioA. Flow patterns, heat transfer and pressure drop for evaporation and condensation of R134A in microfin tubes [J]. International Journal of Refrigeration, 2012, 35(8): 2150-2165

[30] TangW-y, LiWei. A new heat transfer model for flow boiling of refrigerants in micro-fin tubes [J]. International Journal of Heat and Mass Transfer, 2018, 126: 1067-1078

[31] RouhaniZ, AxeissonE. Calculation of void volume fraction in the subcooled and quality boiling regions [J]. International Jouranal of Heat Mass Transfer, 1970, 13(2): 383-393

[32] MoffatR J. Describing the uncertainties in experimental results [J]. Experimental Fluid Thermal Science, 1998, 1(1): 3-17

[33] KandlikarS G. A general correlation for saturated two-phase flow boiling heat transfer inside horizontal and vertical tubes [J]. Journal of Heat Transfer, 1990, 112(1): 219-228

[34] LockhartR W, MartinelliR C. Proposed correlation of data for isothermal two-phase two-component flow in pipes [J]. Chem Eng Prog, 1949, 45(1): 39-45

[35] ChisholmD. A theoretical basis for the Lockhart-Martinelli correlation for two-phase flow [J]. International Journal of Heat and Mass Transfer, 1967, 10(12): 1767-1778

[36] FFIEDEL L. Improved friction pressure drop correlation for horizontal and vertical two-phase pipe flow [J]. Proc of European Two-phase Flow Group Meet. Ispra, Italy, 1979.