PENGARUH SUDUT LOUVERED STRIPS TERHADAP LAJU PERPINDAHAN PANAS PADA COUNTER FLOW HEAT EXCHANGER

Nyoman Arya Wigraha

doi:10.23887/jptk-undiksha.v8i2.2854

PENGARUH SUDUT LOUVERED STRIPS TERHADAP LAJU PERPINDAHAN PANAS PADA COUNTER FLOW HEAT EXCHANGER

Jurnal Pendidikan Teknologi dan Kejuruan ◽

10.23887/jptk.v8i2.2854 ◽

2011 ◽

Vol 8 (2) ◽

Author(s):

Nyoman Arya Wigraha

Keyword(s):

Heat Exchanger ◽

Performance Ratio ◽

Counter Flow ◽

Tube Heat Exchanger ◽

Plain Tube ◽

Flow Heat

Pengaruh turbulator Louvered strips terhadap laju perpindahan kalor dan faktor gesekan aliran turbulen pada double tube heat exchanger dapat memecah (partitioning) dan mengganggu (blockage) pola streamline dari fluida yang mengalir ke saluran pipa dalam (inner tube) sehingga mengakumulasi aliran turbulensi dan meningkatkan laju perpindahan kalor dalam pipa. Louvered strips memiliki variasi sudut serang (q = 15°, 25°, 30°) yang terpasang ditengah-tengah pipa bagian dalam dan searah aliran fluida masuk. Laju aliran fluida (air) panas di bagian pipa dalam diteliti dengan interval 400 lt/jam sampai 900 lt/jam dan laju aliran air dingin di bagian pipa luar konstan 900 lt/jam. Data hasil pengujian dari masing – masing sudut serang turbulator ini dibandingkan data tanpa turbulator (plain tube), secara keseluruhan terjadi peningkatan laju perpindahan kalor sebesar 26 % sampai 58 % dari pada tanpa turbulator serta menghasilkan faktor gesekan dari 25 % sampai 40 %. Dengan performance ratio rata –rata tertinggi pada turbulator dengan sudut 30O sebesar 0,948. Kata kunci: Louvered strips, Heat Exchanger, Counter flow, turbulensi, faktor gesekan, turbulator, efektifitas

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VARIASI KEMIRINGAN SUDUT TURBULATOR TERHADAP LAJU PERPINDAHAN PANAS PADA ALAT PENUKAR KALOR ALIRAN BERLAWANAN (COUNTER FLOW HEAT EXCHANGER)

JST (Jurnal Sains dan Teknologi) ◽

10.23887/jst-undiksha.v4i2.6057 ◽

2015 ◽

Vol 4 (2) ◽

Author(s):

Nyoman Arya Wigraha

Keyword(s):

Heat Exchanger ◽

Performance Ratio ◽

Counter Flow ◽

Tube Heat Exchanger ◽

Plain Tube ◽

Flow Heat

Pengaruh turbulator yang berbentuk Louvered strips terhadap laju perpindahan panas dan faktor gesekan aliran turbulen pada double tube heat exchanger dapat memecah (partitioning) dan mengganggu (blockage) pola streamline dari fluida yang mengalir ke saluran pipa dalam (inner tube) sehingga mengakumulasi aliran turbulensi dan meningkatkan laju perpindahan kalor dalam pipa. Turbulator Louvered strips memiliki variasi sudut serang (q = 15°, 25°, 30°) yang terpasang ditengah-tengah pipa bagian dalam dan searah aliran fluida masuk. Laju aliran fluida (air) panas di bagian pipa dalam diteliti dengan interval 400 lt/jam sampai 900 lt/jam dan laju aliran air dingin di bagian pipa luar konstan 900 lt/jam. Data hasil pengujian dari masing – masing sudut serang turbulator ini dibandingkan data tanpa turbulator (plain tube), secara keseluruhan terjadi peningkatan laju perpindahan kalor sebesar 26% sampai 58% dari pada tanpa turbulator serta menghasilkan faktor gesekan dari 25% sampai 40%. Dengan performance ratio rata –rata tertinggi pada turbulator dengan sudut 30O sebesar 0,948.

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Investigation on fluid flow heat transfer and frictional properties of Al2O3 nanofluids used in shell and tube heat exchanger

10.21203/rs.3.rs-98296/v1 ◽

2020 ◽

Author(s):

sreejesh S R chandran ◽

Debabrata Barik ◽

ANSALAM RAJ T G ◽

Reby ROY

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Transfer Rate ◽

Working Fluid ◽

Flow Properties ◽

Counter Flow ◽

Tube Heat Exchanger ◽

Frictional Properties ◽

Flow Heat ◽

Shell And Tube

Abstract Nanofluids are generally utilized in providing cooling, lubrication phenomenon, controlling the thermophysical properties of the working fluid. In this work, nanoparticles of Al2O3 are added to the base fluid which flows through the counter flow arrangement in a turbulent flow condition. The hot and cold fluids used are ethylbenzene and water respectively and have different velocities on both shell and tube side. This study emphasizes the analysis of flow properties, friction loss, and energy transfer in terms of heat using nanofluid in the heat exchanger. The heat transfer rate of present investigation with nanoparticle addition is 4.63% higher in comparision to Dittus Boelter correlation. Apart from this, the obtained friction factor is 0.0376 very much closer to Gnielinski and Blasius correlations. This investigation proved that appropriate nanoparticle additions and baffle inclinations have fabulous impact upon the performance of heat exchanger and its effectiveness.

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EFEK TURBULATOR LOUVERED STRIP TWISTED TERHADAP KINERJA DOUBLE TUBE HEAT EXCHANGER

Jurnal Ilmiah Inovasi ◽

10.25047/jii.v15i1.65 ◽

2016 ◽

Vol 15 (1) ◽

Author(s):

Ahmad Robiul Awal Udin ◽

Azamataufiq Budiprasojo

Keyword(s):

Heat Exchanger ◽

Performance Ratio ◽

Tube Heat Exchanger ◽

Plain Tube

Pengaruh turbulator terhadap kinerja aliran turbulen pada double tube heat exchanger dapat memecah (partitioning) dan mengganggu (blockage) pola streamline dari fluida yang mengalir ke saluran pipa dalam (inner tube) sehingga mengakumulasi aliran turbulensi dan meningkatkan laju perpindahan kalor dalam pipa. Penelitian Louvered strip twisted ini memiliki variasi sudut serang (q = 15°, 25°, 30°) yang terpasang ditengah pipa bagian dalam dan searah aliran fluida masuk. Laju aliran fluida (air) panas di bagian pipa dalam diteliti dengan interval 400 lt/jam sampai 900 lt/jam dan laju aliran air dingin di bagian pipa luar konstan 900 lt/jam. Kinerja dari double tube heat exchanger meliputi laju perpindahan kalor (QΔLMTD), faktor gesekan (f), NTU (Number of Transfe Unit). Data hasil pengujian dari masing – masing sudut serang turbulator ini dibandingkan data tanpa turbulator (plain tube), secara keseluruhan terjadi peningkatan laju perpindahan kalor sebesar 40 % sampai 72 % dari pada tanpa turbulator serta menghasilkan faktor gesekan dari 51 % sampai 61 %. Dengan performance ratio rata –rata tertinggi pada turbulator dengan sudut 30O sebesar 0,995.

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Flow Prediction and Conjugate Heat-Transfer Analysis of a Counter Flow Heat-Exchanger with Protruded Fin

International Journal of Vehicle Structures and Systems ◽

10.4273/ijvss.12.3.11 ◽

2020 ◽

Vol 12 (3) ◽

Author(s):

Manikandan Mohan ◽

K.C. Udaiyakumar

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Conjugate Heat Transfer ◽

Flow Analysis ◽

Heat Transfer Analysis ◽

Counter Flow ◽

Tube Heat Exchanger ◽

Flow Heat ◽

Optimized Model ◽

Cfd Method

Voluminous cram has been carried out in this project which is intended to improve the conjugate heat-transfer performance of a heat-exchanger. In this study, CFD method is effectively used to predict the effect of Protruded Fins in heat exchanger, which protrudes inside the tube in addition to the shell side. CFD analysis on Protruded Finned Heat Exchanger (PFHE) is carried out with three different fin configurations like rectangular, triangular and parabolic fins. The baseline model of counter flow shell-tube heat-exchanger is considered with standard dimensions and analyzed initially without fins. Later the numbers of fins are increased to optimize the fin position and counts. The shape of the fins is then modified to find an optimized model with a higher heat-transfer coefficient. Hence, the present conjugate heat-transfer and flow analysis focus on optimizing the number of fins for a heat-exchanger with counter flow along with the shape optimization of fins. The computational values are measured with the net heat exchange between the cold and hot-fluids in terms of temperature difference. Also, the area averaged surface heat transfer co-efficient (h) of the heat exchanger with different fin configurations are plotted and compared.

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The Shell and Tube Heat Exchanger Efficiency and Its Relation to Effectiveness

Heat Transfer, Volume 1 ◽

10.1115/imece2003-41633 ◽

2003 ◽

Cited By ~ 6

Author(s):

Ahmad Fakheri

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Heat Transfer Rate ◽

Heat Exchangers ◽

Transfer Rate ◽

Counter Flow ◽

Tube Heat Exchanger ◽

Optimum Heat ◽

Flow Heat ◽

Shell And Tube

The heat exchanger efficiency is defined as the ratio of the actual heat transfer in a heat exchanger to the optimum heat transfer rate. The optimum heat transfer rate, qopt, is given by the product of UA and the Arithmetic Mean Temperature Difference, which is the difference between the average temperatures of hot and cold fluids. The actual rate of heat transfer in a heat exchanger is always less than this optimum value, which takes place in a balanced counter flow heat exchanger. It is shown that for parallel flow, counter flow, and shell and tube heat exchanger the efficiency is only a function of a single nondimensional parameter called Fin Analogy Number. Remarkably, the functional dependence of the efficiency of these heat exchangers on this parameter is identical to that of a constant area fin with an insulated tip. Also a general algebraic expression as well as a generalized chart is presented for the determination of the efficiency of shell and tube heat exchangers with any number of shells and even number of tube passes per shell, when the Number of Transfer Units (NTU) and the capacity ratio are known. Although this general expression is a function of the number of shells and another nondimensional group, it turns out to be almost independent of the number of shells over a wide range of practical interest. The same general expression is also applicable to parallel and counter flow heat exchangers.

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PERFORMANCE ANALYSIS OF MICROCHANNEL COUNTER FLOW HEAT EXCHANGER USING DIFFERENT NANOFLUIDS

10.1615/ihmtc-2017.920 ◽

2018 ◽

Author(s):

Bharath P ◽

Doddamani Hithaish ◽

Saravanan Venkatesh ◽

C K Umesh

Keyword(s):

Heat Exchanger ◽

Performance Analysis ◽

Counter Flow ◽

Flow Heat

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Experimental Investigation of Heat Transfer Enhancement by Using Different Number of Fins in Circular Tube

Wasit Journal of Engineering Sciences ◽

10.31185/ejuow.vol6.iss3.99 ◽

2018 ◽

Vol 6 (3) ◽

pp. 1-12

Author(s):

Kamil Abdul Hussien

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Cold Water ◽

Finned Tube ◽

Hot Water ◽

Copper Tube ◽

Smooth Tube ◽

Tube Heat Exchanger ◽

Mass Flow Rates ◽

Flow Heat

Abstract-The present work investigates the enhancement of heat transfer by using different number of circular fins (8, 10, 12, 16, and 20) in double tube counter flow heat exchanger experimentally. The fins are made of copper with dimensions 66 mm OD, 22 mm ID and 1 mm thickness. Each fin has three of 14 mm diameter perforations located at 120o from each to another. The fins are fixed on a straight smooth copper tube of 1 m length, 19.9 mm ID and 22.2 mm OD. The tube is inserted inside the insulated PVC tube of 100 mm ID. The cold water is pumped around the finned copper tube, inside the PVC, at mass flow rates range (0.01019 - 0.0219) kg/s. The Reynold's number of hot water ranges (640 - 1921). The experiment results are obtained using six double tube heat exchanger (1 smooth tube and the other 5 are finned one). The results, illustrated that the heat transfer coefficient proportionally with the number of fin. The results also showed that the enhancement ratio of heat transfer for finned tube is higher than for smooth tube with (9.2, 10.2, 11.1, 12.1 13.1) times for number of fins (8, 10, 12, 16 and 20) respectively.

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