Analysis of heat transfer enhancement in Rectangular ...

1 International Journal of Current Engineering and Technology E-ISSN 2277 4106, P-ISSN 2347 5161. 2016 INPRESSCO , All Rights Reserved Available at Research Article Analysis of heat transfer enhancement in Rectangular microchannel using refrigerant- R22. Rohit Pingale*, Shriramshastri Chavali and Vivekanand Navadagi Dhole patil College of Engg., Pune University, Pune, India Accepted 15 June 2016, Available online 20 June 2016, Special Issue-5 (June 2016). Abstract Micro heat exchangers are becoming an important area of interest in many fields of developing technology that require compact high heat energy removal solutions. In our work numerical Analysis is has carried out for Rectangular micro channels with five sets of Rectangular configurations, in order to find optimum configuration of microchannel. Analysis of Rectangular microchannel has carried out for forced convection heat transfer condition with constant base area of 30mm length and 20 mm width. Experimental test setup is in developing stage.

2 As compare to other configurations the heat transfer coefficient is more and dominant so 260 m diameter microchannel diameter is more optimistic as compare to other configuration of microchannel theoretically. Also as the heat input increase the configuration with higher hydraulic diameter show less pressure drop as compare to hydraulic diameter of 260 m. Key Words: Microchannel, heat transfer , Pressure drop, heat transfer coefficient. 1. Introduction micro-flow pumps, heat exchanger, valves, thin film coating, combustion, micro-flow sensors and 1 In the comparison with conventional heat exchanger biomedical and biochemical Analysis instruments micro channel has a higher heat transfer performance low to moderate pressure drops, smaller geometric 2. Literature Review size and lower coolant requirement and lower operational cost. Literature review has carried out for work carried out Micro heat exchangers are very vital field in many for microchannel with refrigerant and water as a developing areas that requires compact and high heat medium.

3 The literature review combines the removal solutions. Areas such as macro electronic experimental, theoretical and CFD Analysis of devices, aerospace applications are having space microchannel as follows. limitations so we have to search smaller heat and et al studied the heat exchanger which having high heat removal capacity. In transfer and pressure drop characteristics of R-22 in last researches many discussion was done on validity microchannel tubes air conditioning and refrigeration of macro scale fluid flow relations with micro scale center' in which they studied a out heat transfer and fluid flow relations. In today's word many applications pressure drop characteristics for single-phase and two required very high heat transfer devices maintaining phase flow of refrigerants in micro channel tubes was their temperature below its operating temperature conducted. The refrigerants tested were R-22, R-134a which affects its performance such that in case of high and R-407C.

4 In addition to circular port tubes, square- performance computers chips its temperature must e port tubes were tested with R-22 for both single-phase maintained elow c. and two-phase flow. Experiment using R-22 and CO2 in a horizontal T. Kulkarni, C. W. Bullard, and K. Cho et alanalysed manifold feeding 21 parallel heat exchanger tube using refrigerant side tradeoffs in microchannel evaporators'. counter flow water jacket as a heat source. Micro in which they studied that microchannel condensers channel used in micro heat pump for microprocessor cooling or portable cooling devices, small scale have dominated the automotive a/c market by stationary auxiliary power unit and cryosurgical probe maximizing performance for a fixed size and weight, for ablating tumors or treating heart arrhythmia. The but must operate as evaporators if they are to be used applications of micro system are increasing day by day. in heat pumps. Micro fluidic systems have many applications such as SureshV, And Garimella Dong Liu et al studied about the microchannels considered ranged in width *Corresponding author: Rohit Pingale from 194 micrometer to 534 micrometer, with the 419| MIT College of Engineering, Pune, India, MECHPGCON 2016, INPRESSCO IJCET Special Issue-5 (June 2016).

5 Rohit Pingale et al Analysis of microchannel using refrigerant R22. channel depth being nominally five times the width in exchangers are the latest trend in for heating and each case. Their study was conducted for water flowing cooling technologies providing up to a 40% increase in under laminar conditions through microchannels efficiency. Most micro-channel heat exchangers on the machined in silicon water. heat fluxes as high as market today are constructed out of aluminum. The 790W/cm2 were achieved with the chip temperature invention is a method to produce a copper maintained below 110 degree Celsius. microchannels tube. Honggi Cho and Keumnam Cho et al studied the , And V. and S. G. Kandlikar Performance of microchannel evaporators with about the Numerical investigation of heat refrigerant R-22, in which they do an experimental transfer in Rectangular microchannel under H2. study on the performance comparison of microchannel boundary conditioning during fully develop laminar evaporators with refrigerant R-22 was conducted.

6 The flow for five different cases In present work experiment was performed with both vapor Rectangular microchannel with aspect ratio from to compression system and refrigerant circulation 10 are numerically simulate by using CFD software. system. The cooling capacity proportionally increased Chad D. Bowers, Helena Mai, Stefen Elbel, Pega as the vertical inclination angle of the evaporator Hrnjak et al studied the refrigerant distribution effect increased due to gravity force. on the performance of microchannel evaporator. They , And Ronald J,Juan et al studies on Liquid studied the flow pattern in various directions Flows in Microchannels, in which they studied about evaporator coil orientation by experimental study by the Nominally, microchannels can be defined as flowing the refrigerant over the drop for channels whose dimensions are less than 1 millimeter the refrigerant R245fa was almost three times higher and greater than 1 micron. Above 1 millimeter the flow than that of R134a for the same operating condition.

7 Exhibits behavior that is the same as most macroscopic et al studied flow boiling heat transfer in flows. mini and micro channels. In which he studied about a Mirza Mohammed Shah, And Etcher Thompson et a comprehensive review of flow boiling heat transfer lstudied heat transfer during condensation inside small characteristics of various working fluids in mini and channels. In which he studied about Prediction of heat micro channels is presented in this paper. Due to their transfer during film condensation in mini and high heat transfer and heat removal properties, two microchannels is of much practical interest. No well- phase flows have been studied and applied into the verified method for this purpose is available. The electronics cooling systems. Further developments in applica ility of the author's well-validated general existing research for future research based on this area correlation for condensation in tubes to small channels of review have been established.

8 Is investigated in this paper. Laith Jaafer Habeeb ,Riyadh S. and Al-Turaihi et ,H,A. Mohammed, Shuaib, alstudied the experimental study and CFD simulation et alstudied about the effect of geometrical of two phase flow around triangular obstacle in parameters on heat transfer characteristics of enlarging channels for the study of theoretical Analysis microchannel sheet sink with different shapes and give and experimental highlighting bubbly flow around the summary about their study as follow, they carried out triangular bodies in horizontal bodies. work on geometrical parameters on heat transfer Zhannu Zhou, and Xiande Fang et al studied characteristics of microchannel sheet sink with Evaluation of Correlations of flow boiling heat transfer different shapes. Poiseuille number increases evidently of R-22 in horizontal channels' in which the studied when H/a and L/Dh decreases while b/a increases The about the calculation of two phase flow boiling heat tip angle of triangular shaped micro channels has a transfer of R22 in channels is required in a variety of great effect on the Poiseuille number.

9 Poiseuille number increases evidently with the increase of tip applications, such as chemical process cooling systems, angle from =22. 4 . refrigeration, and air conditioning. Two correlations Saptarshi Basu, Sidy Ndao, Gregory Michna, Yoav for R-22 with the mean absolute deviation and Peles , Michal k. Jensen et alstudied the Flow boiling of analysed. A. Nomerotski, J. Buytart, P. Colline, R. Dumps, E. R134a in circular micro tubes for critical heat flux Greening, M. John, A. Mapelli, A. Leflat, Y. Li., G. condition and fended the experimental critical heat flux Romagnoli and B. Verlaathas studded the experimental data and plot the different graphs on it for the internal and graphical Analysis of Evaporative CO2 cooling diameter of , , and (CHF)- using microchannels etched in silicon for the future Critical heat flux. The Thomsen map identified the flow LHCb vertex detector. They have prepared the regime as annular in all three test section. microchannels on silicon by using the etching process et al carried out Analysis of Rectangular on the chip (plate) for the experimental Analysis .

10 Microchannel for water as cooling medium. CFD Tom Saenen and Martine Baelman et al studied Analysis of Rectangular microchannel carried out to about the size effect of portable two-phase electronic analyse flow assumptions in microchannel. Based on cooling system they studied the results from numerical experimental results a non dimensional co relation is system model are discuses for analytical model. A. proposed for Rectangular microchannel. parameter study performed on small size of cooling Dingkunli et al studied Copper microchannel for system it shows that increasing in boiling temperature HVAC, in which he studied about Micro-channel heat a decrease in vapor quality or mass flow rate. 420| MIT College of Engineering, Pune, India, MECHPGCON 2016, INPRESSCO IJCET Special Issue-5 (June 2016). Rohit Pingale et al Analysis of microchannel using refrigerant R22. P. Rosa , T. G. Karayiannis and M. W. Collins [20] has 3] heat supplied is constant from heater input at base studied the single phase heat transfer in microchannel surface area of microchannel.