scholarly journals EXPERIMENTAL DETERMINATION OF CONDENSER LENGTH EFFECT ON THE THERMOSYPHON PERFORMAN

2019 ◽  
Vol 19 (3) ◽  
pp. 17
Author(s):  
Talib, Z. Farge ◽  
Sahar, R. Al-Sakini ◽  
Aseel, A. Ismael
Keyword(s):  
Temperature Distribution ◽  
Temperature Gradient ◽  
Ambient Temperature ◽  
Experimental Determination ◽  
Heat Dissipation ◽  
Filling Ratio ◽  
Transformer Oil ◽  
Working Fluid ◽  
Length Effect

ABSTRACTIn the current work, a thermosyphon was used to investigate the effect of condenser length on its performance. Experimentally by using a pipe of copper having same evaporator length of 120 mm and three different condenser lengths which were 400 mm , 500 mm and 600 mm. The internal and external diameters of the thermosyphon were 26 mm and 28 mm respectively. The evaporator part of the thermosyphon was immersed in the electrical transformer oil, which heated by external heater from ambient temperature to approximately 80 oC, while the condenser part was left to cool naturally by air. Five thermocouples were located on the thermosyphon wall to read the temperature distribution at different positions. The working fluid was water with filling ratio of 50%.The results have obviously shown that temperature gradient was decreased when the condenser length increased and giving a better performance for heat dissipation. The percentage of temperature gradient was positively correlated to the condenser length and it was found that condenser length of ( 400 , 500 , 600) mm gave percentage of decreasing temperature gradient are 67.94 % , 72.94 % , and 77.06 % respectively with respect to that without using thermosyphon .

METHOD FOR EXPERIMENTAL DETERMINATION OF THE LIQUID DIELECTRIC RESOURCE AND MEASURES FOR ITS RESTORATION

2019 ◽  
pp. 36-41
Author(s):  
S. P. Vysogorets ◽  
A. N. Nazarychev ◽  
A. A. Pugechov
Keyword(s):  
Experimental Determination ◽  
Oil Quality ◽  
Technical Problem ◽  
Transformer Oil ◽  
Quality Stability ◽  
Transformer Oils ◽  
Resource Characteristics ◽  
Theoretical Foundations

The theoretical foundations of changes in the transformer oil quality characteristics, depending on the aging degree, are presented. The introduction of a new indicator of the exploitational transformer oils quality – “stability against oxidation” – is substantiated as a way of solving the scientific and technical problem of assessing the resource characteristics of a transformer insulating system. In order to select the best measures to maintain the quality of power transformers insulating oils, a newly developed “Method for the Experimental Determination of the Luquid Dielectric Resource and Measures for its Restoration” is presented.

X-ray diffraction method for determination of interplanar spacing and temperature distribution in crystals under an external temperature gradient

2015 ◽  
Vol 48 (3) ◽  
pp. 853-856 ◽  
Author(s):  
V. R. Kocharyan ◽  
A. S. Gogolev ◽  
A. E. Movsisyan ◽  
A. H. Beybutyan ◽  
S. G. Khlopuzyan ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Temperature Gradient ◽  
Single Crystal ◽  
Interplanar Spacing ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
External Temperature ◽  
X Ray ◽  
Spacing Distribution

An X-ray diffraction method is developed for the determination of the distribution of temperature and interplanar spacing in a single-crystal plate. In particular, the temperature and the interplanar spacing differences in two different parts of a quartz single crystal of X-cut are experimentally determined depending on the value of the temperature gradient applied perpendicularly to the reflecting atomic planes (10\bar 11). The temperature distribution along the direction perpendicular to the reflecting atomic planes (10\bar 11) and the interplanar spacing distribution of atomic planes (10\bar 11) are determined as well.

Investigation on the Optimum Volume-Filling Ratio of a Loop Thermosyphon Solar Water-Heating System

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Tao Zhang ◽  
Gang Pei ◽  
Qunzhi Zhu ◽  
Jie Ji
Keyword(s):  
Temperature Distribution ◽  
Thermal Performance ◽  
Solar Collector ◽  
Filling Ratio ◽  
Working Fluid ◽  
Water Heating ◽  
Solar Water Heating ◽  
Volume Filling ◽  
Solar Water ◽  
Optimum Volume

Volume-filling ratio of the working fluid has a predominant effect on the system performance of a closed two-phase solar water-heating (SWH) system. To study this effect, a prototype of a loop thermosyphon SWH system, which uses remolded flat-plate solar collector as the evaporator and the coil pipe in the water tank as the condenser, was set up. A set of long-term outdoor experiments under 10%, 20%, 30%, 50%, and 70% volume-filling ratios were conducted in this paper. R600a was used as working fluid. Loop thermosyphon solar collector thermal performance and system thermal performance under different volume-filling ratios, including the temperature distribution of loop thermosyphon evaporator, were presented. It is shown that the loop thermosyphon solar collector and the system had a better thermal performance than the conventional ones under 30% and 50% volume-filling ratio, and the loop thermosyphon evaporator had an even temperature distribution when the volume-filling ratio was higher than 30%. The optimum volume filing ratio lies in between 30% and 50% of the whole system volume.

Experimental Determination of the Yield Stress for Copper, Cu_99.75

2014 ◽  
Vol 659 ◽  
pp. 40-45 ◽  
Author(s):  
Alin Marian Cazac ◽  
Diana Antonia Gheorghiu ◽  
Constantin Baciu ◽  
Stefan Lucian Toma ◽  
Carmen Bujoreanu ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Ambient Temperature ◽  
Experimental Determination ◽  
Yield Stress ◽  
Degree Of Deformation ◽  
Deformation Simulation ◽  
Deformation Processes

The paper presents the determination of the yield stress for copper, Cu_99.75, at standard ambient temperature, by means of upsetting of cilyndrical specimens, taking account the allowable degree of deformation of this material. The outcomes achieved can be used both plastic deformation processes and volumic deformation simulation of copper Cu_99.75.

scholarly journals Experimental Investigation of Thermosyphon Thermal Performance Using Different Filling Ratio

2021 ◽  
Vol 39 (1A) ◽  
pp. 34-44
Author(s):  
Talib Z. Farge ◽  
Samar J. Ismael ◽  
Rawad M. Thyab
Keyword(s):  
Experimental Investigation ◽  
Thermal Resistance ◽  
Thermal Performance ◽  
Heat Dissipation ◽  
Operating Temperature ◽  
Input Power ◽  
Filling Ratio ◽  
Working Fluid ◽  
Distilled Water ◽  
Percentage Decrease

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.

Sign in / Sign up

Export Citation Format

Share Document