Experimental Investigation of Thermosyphon for Different Parameters (original) (raw)
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Comparative Study of Two Phase Closed Thermosyphon with Different Fluids and Fill Volume Ratio
IOSR Journal of Mechanical and Civil Engineering, 2014
In this paper an experimental study was performed to observe the effect of fill volume ratio, inclination angle and heat input supplied to understand the heat transfer characteristics of a two phase closed thermosyphon (TPCT) charged with glycol and water. For the experimentation purpose four copper TPCT's of same dimensions were designed which are filled with aqueous solution of Propylene Glycol (PG) with 50% purity and De-ionized (DI) water with fill volume ratio of 40% and 60% and are heated with hot water in evaporator jacket from 60°C to 90°C. TPCT's were also tested for the inclination of 0° to 50° from vertical. Temperature distributions along the length of TPCT's were noted, heat supplied to evaporator along with heat removed from condenser section were also measured. The experimental results indicate that the PG TPCT works better at higher heat inputs and its optimum inclination angle is between 20° to 30° and that for DI water TPCT is 10° to 20°. Efficiencies of TPCT's were found to increase with respect to increase in heat input but are less affected with fill volume effect.
Thermal Performances Of Two Phase Closed Thermosyphon With Different Inclination Angles
2020
Thermal performance of a two phase closed thermosyphon (TPCT) is analyze for different inclination angles. TPCT is circular pipe and filled with acetone. A Simple circular pipe made up of aluminum and it tested for heat input of 50W to 300W at a different inclination angle 30, 40, 50, 60, 90. TPCT used with 30c/o filling ratio. Thermal efficiency of TPCT and the mean temperature difference between evaporator and condenser (Te-Tc) determined and plotted with 30c/o of filling ratio. Whole analysis shows that inclination has no significant effect thermal performance of TPCT.
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/experimental-investigation-of-two-phase-closed-thermosyphon-using-propylene-glycol-as-a-working-fluid https://www.ijert.org/research/experimental-investigation-of-two-phase-closed-thermosyphon-using-propylene-glycol-as-a-working-fluid-IJERTV3IS080521.pdf In the present study the heat transfer characteristic of two phase closed thermosiphon (TPCT) using Propylene Glycol (PG) is analysed experimentally and compared with De-ionized (DI) water for different inclinations and heat input. For the experimentation, two copper thermosyphon of same dimensions are designed. Both are filled with equal fill volume ratio. One TPCT is charged with de-ionized water and the other with aqueous solution of Propylene Glycol with 50% purity. The experimental results indicate that the Propylene Glycol thermosyphon works better at higher heat inputs and the optimum inclination angle for PG thermosyphon is between 20°-30° and that for DI water is 10° to 20°.
Thermal Characteristics of a Circular Finned Thermosyphon Using Different Working Fluids
Applied Mechanics and Materials, 2014
The two-phase closed thermosyphon (TPCT), which is essentially a gravity-assisted wickless heat pipe, utilizes the evaporation and condensation of the working fluid inside the TPCT to transport heat. This experimental study was carried out to understand the thermal performance of circular finned thermosyphon using nanofluid with alcohol and was analyzed, compared with alcohol and base fluid DI water. The concentration of nanoparticle used in this setup was 110mg/lit of TiO 2 combined with 0.2 ml of ethylene glycol. The heat input (Q) were 10W, 12W, 14 W and 16 W and the orientation 30°, 45°, 60° and 90°.The results demonstrate that TiO 2 nanofluid with 0.2 ml of ethylene glycol improves the performance through reduction in thermal resistance by 85.86%.
Experimental Investigation of Thermosyphon Thermal Performance Using Different Filling Ratio
Engineering and Technology Journal
The present work investigated the thermal performance of thermosyphon by using distilled water as a working fluid at different filling ratios (50%, 60%, and 70 %). The thermosyphon was manufactured from a copper tube with outer and inner diameters (26 and 24) mm, respectively. The thermosyphon was tested experimentally at different input power (100, 200 and 300) Watt. The operating temperature of the oil was chosen below 85°C. Experimental results revealed that the filling ratio of 60% exhibited the best heat dissipation at the highest operating temperature. While the low operating temperature and 50 % filling ratio show better heat dissipation. Further, it was found that the thermal resistance of the thermosyphon was obviously decreased with increasing the input power. The percentage decrease in the thermal resistance of the thermosyphon at a filling ratio of 0.6 was 14.6 % compared with that filling ratio of 0.5 at an input power of 300 W.
Heat Transfer Analysis of Two Phase Closed Thermosyphon using Aqueous Solution of n-Butanol
Two phase closed thermosyphon is proved to be a good heat transfer device. A large amount of heat is transferred from evaporator section to condenser section with relatively a small temperature difference. In this paper, the heat transfer of two phase closed thermosyphon is analysed experimentally with different inclinations and heat input. For this experiment, two copper thermosyphons of length 1000 mm, inner diameter 17 mm and outer diameter 19 mm are designed. Both are charged with 60 ml of working fluid with an evaporator length of 400 mm and condenser length of 450 mm. One thermosyphon is charged with de-ionized water (DI) and the other with aqueous solution of n-butanol. It is found that the heat transfer coefficient of aqueous solution of n-butanol is higher than that of de-ionized water.
Heat Transfer Enhancement Techniques in Two Phase Closed Thermosyphon: A Review
The performance of heat transfer is one of the most important research areas in the field of thermal engineering. Due to the high heat transfer effectiveness, thermosyphon has its own importance in the low temperature heat transfer. Researchers observed that geometrical factors and working solutions have significant influence on the performance of thermosyphon. Therefore the experimental study of thermosyphon is essential to find out the factors affecting the performance of thermosyphon. In this review paper main focus is given to parameters like filling ratio, aspect ratio, heat load, mass flow rate and inclination angle, which affects the thermal performance of thermosyphon. Also the new heat transfer enhancement techniques like use of binary mixture, use of ultrasonic wave, resurfacing and CFD analysis are enlighten. From the literature it seems to be need of binary solution, new efficient and minimum ODP and GWP refrigerants and mathematical modelling of thermal performance of thermosyphon.
Heat transfer characteristics of closed-end thermosyphon (CE-TPCT)
Engineering Science and Technology, an International Journal, 2021
This study investigated the heat transfer characteristics of a Closed-End Thermosyphon (CE-TPCT) made of copper tubes with 5.5 mm diameter. The experiments were conducted with working substance filling rates of 0%, 30%, 50%, and 70% of the volumetric evaporator section, the evaporator temperatures of 50, 70, and 90°C and inclination angle of 90°. The lengths of the evaporator section, adiabatic section and condenser section used in the experiments were 60 mm, the distance between the compartments was 5Di. Water was the working substance used in the experiments with the mass flow rate of the water inlet at the condenser section of 0.25 L/min. The water inlet temperature at the condenser was 20°C. Obtained results were compared with convectional Thermosyphon (TPCT) which was tested under the same conditions. The results showed that CE-TPCT at the filling rate of 70% at the evaporator section volume had an average heat transfer rate and average heat flux of 140.72 ± 4.92 W and 33.41 ± 1.16 kW/m 2 , respectively, throughout the experiment. These results were higher than the other tested parameters. The highest heat transfer rate of 220.32 ± 7.71 W and average heat flux of 52.31 ± 1.83 kW/m 2 were recorded at the evaporator temperatures of 90°C. The experiment also showed a lower average total thermal resistance throughout when it was compared with other test parameters which was equal to 0.547°C/W. This resulted in high heat transfer coefficients and relative thermal efficiency of 625.11 W/m 2 Á°C and 1 respectively, the highest value of all studied experimental variables. When the maximum heat flux results between CE-TPCT and TPCT under the same condition parameters were compared, CE-TPCT demonstrated a higher heat flux value of 18.24%. The heat transfer characteristics of the CE-TPCT obtained from this study provides an alternative application choice for various types of heat exchanger that can reduce energy consumption in the future.
Experimental Study of Closed-Loop Thermosyphon System Using Different Working Fluids
2020
Thermosyphon is a heat transferring device which transfers heat over long distance and where the liquid is returned to the evaporator by gravitational force. The closed-loop thermosyphon (CLT) transfers heat with phase change phenomenon. A large amount of heat is transferred from evaporator section to condenser section with a relatively small temperature difference. The thermal performance of closedloop thermosyphon (CLT) is influenced by the governing parameters like filling ratio, heat input, adiabatic length, working fluids, etc. This paper investigates the effects of these parameters on thermal performance of closed-loop thermosyphon system for different working fluids. In this work the filling ratio (FR) is varied in the range of 30-80% in the step of 10% at various heat inputs of 0.5-2 kW with a step of 0.5 kW for each evaporator and adiabatic length (vapor line length) is taken as 200 mm. The working fluid used as methanol, ethanol, acetone, and distilled water. The performance plots of the performance parameters like thermal resistance, evaporative heat transfer coefficient (HTC), and condenser heat transfer coefficient for these different working fluids, heat inputs, and filling ratios are plotted and results are analyzed. From the result, it is found that acetone has comparatively lowest thermal resistance. Water has comparatively highest evaporative heat transfer coefficient as well as condenser heat transfer coefficient.
IJCSIS, 2019
In this work, the heat dissipation of the prototype thermosyphon system was investigated for different filling ratio, number of fins at vertical and 45° angle. The prototype was well insulated to ensure the heat lost by the thermosyphon only. Three different filling ratios of the working fluid (25 %, 50 %, and 75%) for the vertical and 45° inclination angle were investigated. Also, a four different number of fins (30, 40, 50 and 70) were investigated in this work. A computer program used to control the temperature of the oil inside the prototype vessel and to calculate the heat power dissipation. The experiment was conducted using the copper tube which has an outside diameter of 22.3 mm with a thickness of 0.8 mm. The length of thermosyphon for three sections (evaporator, adiabatic and condenser) was (23, 7 and 35 cm) respectively. The working fluid used was the distilled water in all the experiments. The results show that the highest heat dissipation power in the case obtained of using thermosyphon with an inclination angle of 45o, the number of fins of 70 and filling ratio of 50%. Key words: Prototype with Thermosyphon inclination angles, filling ratios, number of fins, heat dissipation.