scholarly journals Choke Point in Mini Expansion Device for the Development of Portable Vaccine Kit

2019 ◽  
Vol 9 (2) ◽  
pp. 3387-3393
Keyword(s):  
Capillary Tube ◽  
Food Preservation ◽  
Hydraulic Diameter ◽  
Small Scale ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Data Logger ◽  
Capillary Tubes ◽  
Vapor Compression Refrigeration ◽  
Experimental Rig

Vapor compression refrigeration system is substantial to human comfort and needs that contributes to the progress mainly in agriculture, food preservation and in medical application. One of the applications that this study focused on is the study of the choke points in mini expansion device for the development of portable vaccine carrier kit. This study utilized a vapor compression refrigeration system, and aims to improve the system operation of a small-scale vapor compression refrigeration system by using spirally-arranged capillary tubes with five(5) different hydraulic diameters, namely; 0.20mm, 0.25mm, 0.30mm, 0.35mm and 0.40mm. A 1/8 horsepower vapor compression refrigeration system of a water dispenser is used as an experimental rig that supply the required refrigerant flow on the spirally- arranged expansion device. Guitar strings are used to reduce the hydraulic diameter of the commercially available capillary tubes. With the inserted guitar strings, the five(5) different hydraulic diameters in this study would be connected to the experimental rig. The data gathering method is developed by using a data logger and the fabricated spirally-arranged capillary tubes connected to the experimental rig. The determination of its lengths of choke point and the behavior of the pressure drop is measured during the different trials used for every hydraulic diameter of the spirally-arranged capillary tube. The mathematical equation that correlates the hydraulic diameters of the capillary tubes and their corresponding choke points is represented by the equation y = -1,836.0x2 + 2,319.0x-1 - 1.7860, where y is the distance of the capillary tube choke point and x is the hydraulic diameter of the fabricated spirally-arranged capillary tubes. This equation correlates the hydraulic diameter of a capillary tube to its corresponding choke point length with a value of R2 = 0.9947.

Investigation Analysis on the Performance Improvement of a Vapor Compression Refrigeration System

2014 ◽  
Vol 592-594 ◽  
pp. 1638-1641
Author(s):  
M. Ravi Chandra ◽  
Kappati Manikanth Reddy
Keyword(s):  
Capillary Tube ◽  
Welding Process ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Counter Flow ◽  
Heating And Cooling ◽  
Flow Heat ◽  
Vapor Compression Refrigeration ◽  
Arc Welding Process ◽  
Design And Manufacture

The principal objective of the paper is to modify the conventional vapor compression refrigeration system by connecting heat exchangers thereby heating and cooling of water is done simultaneously. The vapor refrigerant is supplied to the hermetic sealed compressor where the refrigerant gets compressed to a temperature of 100-120◦ C. The compressor is connected to a counter flow heat exchanger. Experimentation is carried out to design and manufacture a modified vapor compression refrigeration system. The main parameters considered during the design are connection of a compressor to a hermetically sealed compressor, keeping polyurethane foam as insulating material, adjusting the capillary tube and finned evaporators. The operations carried during the fabrication of equipment are bending, brazing and arc welding process. After the experimental setup has been fabricated the system is checked for the performance by using refrigerants R-22 and R-407.The results are plotted between heating temperatures, cooling temperatures with respect to time in minutes.

scholarly journals Pressure Drop if Tetraflouroethane in Small Hydraulic Diameter Capillary Tubes

2020 ◽  
Vol 9 (4) ◽  
pp. 2246-2252
Keyword(s):  
Stainless Steel ◽  
Pressure Drop ◽  
Capillary Tube ◽  
Current Trend ◽  
Pressure Sensors ◽  
Hydraulic Diameter ◽  
Modern World ◽  
Data Logger ◽  
Capillary Tubes ◽  
Pressure Drops

Developing a compact device has become a current trend in this modern world which pertains to a lesser energy consumption. It also applies to a mini refrigerator unit to accommodate a small device being cooled wherein the cooling unit has to be in a smaller configuration compared with the conventional sizes. This study focuses on the pressure drop of capillary tubes with six(6) different small hydraulic diameters of 0.20mm, 0.25mm, 0.30mm, 0.35mm, 0.40mm, and 0.45mm with 3 different total lengths of 300mm, 600mm, and 900 mm. Tetraflouroethane liquid refrigerant is used as the cooling medium for the refrigeration system which allows the expansion of the refrigerant in order to absorb heat from the surroundings. In fabricating these six(6) different small hydraulic diameters, stainless steel strings were inserted into the conventional capillary tubes to reduce and attain the required hydraulic diameters. The pressure sensors were installed and pressure readings were then obtained in every 300-mm section of the capillary tube assembly. By allowing the pressurized tetrafluoroethane refrigerant to flow from its reservoir tank through the capillary tubes, pressure readings were taken by the data logger in every 300-mm section of the capillary tube. With these data, the pressure drops were then calculated. Pressure drop of all the six(6) sets of capillary tubes were tested and analyzed. The result showed that the 0.20mm with a length of 900 mm capillary tube has the greatest pressure drop compared to the other specimens of the capillary tubes. It then implies that fabricating a small hydraulic diameter of capillary tube as small as 0.20mm by stainless steel string insertion is possible for 300-mm section, however for the longer section it needs more skills in inserting the string.

Experimental Analysis of R134a/LPG as Replacement of R134a in a Vapor-Compression Refrigeration System

2017 ◽  
Vol 25 (02) ◽  
pp. 1750015 ◽  
Author(s):  
Jatinder Gill ◽  
Jagdev Singh
Keyword(s):  
Experimental Analysis ◽  
Capillary Tube ◽  
Energy Performance ◽  
Tube Length ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Experimental Conditions ◽  
Discharge Temperature ◽  
Wide Range ◽  
Vapor Compression Refrigeration

This paper presents an experimental analysis of a vapor compression refrigeration system (VCRS) using the mixture of R134a and LPG with mass fractions of 28:72 as an alternative to R134a. In this work, we compare the energy performance of both refrigerants, R134a/LPG (28:72) and R134a, in a monitored vapor compression refrigeration system under a wide range of experimental conditions. So, the System with R134a/LPG (28:72) was tested by varying the capillary tube length and refrigerant charge under experimental conditions. Performance comparisons of both the systems are made taking refrigerant R134a as baseline, and the results show that the compressor power consumption, compressor discharge temperature and pull down time obtained with R134a/LPG (28:72) of 118[Formula: see text]g and capillary tube length of 5.1 m in vapor compression refrigeration system are about 4.4% 2.4% and 5.3%, respectively, lower than that obtained with R134a in the studied range. Also, when using R134a/LPG (28:72), the system shows values of refrigeration capacity and COP are about 10.6% and 15.2% respectively, higher than those obtained using R134a, In conclusion, the mixing refrigerant R134a/LPG proposed in this study seems to be an appropriate long-term candidate to replace R134a as a new generation refrigerant of VCRS, because of its well environmentally acceptable properties and its favorable refrigeration performances.

scholarly journals A Review of Literature on Various Techniques of COP Improvement in Vapor Compression Refrigeration System

2021 ◽  
Vol 9 (11) ◽  
pp. 1753-1759
Author(s):  
Anupam Mishra
Keyword(s):  
Power Consumption ◽  
Heat Dissipation ◽  
Water Mist ◽  
Nano Particles ◽  
Coefficient Of Performance ◽  
Small Scale ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Nano Fluid ◽  
Vapor Compression Refrigeration

Abstract: This review paper is a study on various methods of performance improvement in domestic refrigeration systems, based on the vapor compression refrigeration VCRS cycle. Here air-cooled, water-cooled, fog cooled, evaporatively cooled condensers and nano-fluid lubricant /coolant methods their working and efficiency are reviewed, compared, analyzed and presented. The paper inspects the work done by different researchers for the maximization of heat loss from condenser & compressor and bringing about necessary modifications to reduce the overall power consumption of domestic refrigerators by improving Coefficient of Performance (COP). Numerous works have been done on improving the heat dissipation capacity of condenser but using nano-fluid in lubricant base as refrigerant and in the compressor shell as coolant is a new technology. Nano-fluid increase heat transfer due the high conductivity nano particles. It has been observed that water cooled condensers and compressors with nano-lubricants/coolants give the best performance improvements but they suit better for big or large refrigeration systems like centralized air conditioning systems or cold storage warehousing, whereas air cooled and evaporative condensers are optimal for small scale or low power appliances like domestic refrigerators, water coolers or split air conditioners to reduce overall power consumption by increasing the COP. Keywords: Refrigeration system, COP improvement, Condenser, Water mist, Evaporative cooling, Nano-fluid coolant, VCRS cycle.

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