scholarly journals Experimental Test of Locally Fabricated Public Water Cooler

2020 ◽  
Vol 8 (5) ◽  
pp. 5069-5074
Keyword(s):  
Cooling System ◽  
Capillary Tube ◽  
Raw Materials ◽  
Ambient Air ◽  
Hot Water ◽  
Experimental Result ◽  
Vapor Compression ◽  
Main Challenge ◽  
Vapor Compression Refrigeration ◽  
Water Cooler

The main challenge in the rift valley and low land regions of Ethiopia, the society directly utilize ground hot water for both drinking and shower due to this cause the society is forced to buy cooled bottled mineral water daily. The use of locally fabricated public water coolers seems to be a solution to this problem. The objective of this study is the performance evaluation of locally fabricated public water cooler using a vapor compression refrigeration system. The four basic components of the water cooler, namely, the condenser, evaporator, compressor and the capillary tube are designed and selected separately. The amount of water to be cooled(0.083m^3), ambient air temperature(28℃), water temperature (44℃), the time required to cool water and the evaporator heat load(cooling load of water is 12847.87 KJ) are the predetermined parameters. The raw materials used to fabricate public water cooler are aluminum sheet, compressor, evaporator coil, condenser coil, capillary tube, filter-dryer, refrigerant fluid, water tap, insulator and thermostat. A comparison of experimental and theoretical results has been done and the COP of the cooling system from the theoretical analysis is 3.89 and correspondingly that of an experimental result is 3.17. This shows some variation is observed because of the ideal assumption of the vapor compression refrigeration processes. Also, a Comparison of the present study with literature has been done.

scholarly journals CFD Analysis of the Optimization of Length of Capillary Tube for a Vapor Compression Refrigeration System

2021 ◽  
Vol 9 (8) ◽  
pp. 2567-2578
Author(s):  
Ms. K. P. Bhangle
Keyword(s):  
Capillary Tube ◽  
Flow Analysis ◽  
Small Diameter ◽  
Flow Characteristics ◽  
Working Fluid ◽  
Vapor Compression ◽  
Adiabatic Flow ◽  
Ansys Cfx ◽  
Vapor Compression Refrigeration ◽  
R 134A

Abstract: The capillary tube is commonly employed in refrigerant flow control systems. As a result, the capillary tube's performance is optimal for good refrigerant flow. Many scholars concluded performance utilising experimental, theoretical, and analysis-based methods. This paper examines the flow analysis of a refrigerant within a capillary tube under adiabatic flow circumstances. For a given mass flow rate, the suggested model can predict flow characteristics in adiabatic capillary tubes. In the current work, R-134a refrigerant has been replaced by R600a refrigerant as a working fluid inside the capillary tube, and the capillary tube design has been modified by altering length and diameter, which were obtained from reputable literature. The analysis is carried out using the ANSYS CFX 16.2 software. The results show thatutilising a small diameter and a long length (R600a refrigerant flow) is superior to the present helical capillary tube. The most appropriate helical coiled design with a diameter of 0.8 mm and a length of 3 m is proposed. Keywords: Capillary Tube, Condenser, Refrigeration effect, CFD.

scholarly journals Numerical investigations of solar-assisted hybrid desiccant evaporative cooling system for hot and humid climate

2020 ◽  
Vol 12 (6) ◽  
pp. 168781402093499
Author(s):  
Shafqat Hussain ◽  
Abdulrahim Kalendar ◽  
Muhammad Zeeshan Rafique ◽  
Patrick Oosthuizen
Keyword(s):  
Relative Humidity ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Ambient Air ◽  
Coefficient Of Performance ◽  
Cooling Load ◽  
Vapor Compression ◽  
Humid Climate ◽  
Numerical Investigations ◽  
Evaporative Cooling System

This article presents numerical investigations of the solar-assisted hybrid desiccant evaporative cooling system integrated with standard air collectors for applications under the hot and humid climatic conditions of Kuwait city. The objective is to introduce the energy-efficient and carbon-free solar-assisted hybrid desiccant evaporative cooling system to alleviate the principal problems of electricity consumption and carbon emissions resulting from the use of the conventional vapor-compression cooling systems. In the normal building, during cooling load operation, the solar-assisted hybrid desiccant evaporative cooling system can cope with the cooling load particularly sensible by evaporative cooling and latent through desiccant dehumidification. The outcomes of this work indicate that solar-assisted hybrid desiccant evaporative cooling device integrated with air collectors is capable of providing average coefficient of performance of 0.85 and has the potential to provide cooling with energy saving when compared with conventional vapor-compression refrigeration systems. It was concluded that under the intense outdoor environmental conditions (ambient air at greater than 45°C and 60% relative humidity), the delivered supply air from the evaporative cooling was nearly at 27°C and 65% relative humidity. To solve this problem, the system was assisted with conventional cooling coil (evaporator of heat pump) to supply air at comfortable conditions in the conditioned space.

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.

Hybrid Desiccant Cooling System Using Condensing Heat as the Regeneration Source. Part I: System Model

2011 ◽  
Vol 383-390 ◽  
pp. 6422-6426 ◽  
Author(s):  
Xing Han ◽  
Xu Zhang
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Energy Saving ◽  
Cooling System ◽  
System Model ◽  
Sensible Heat ◽  
Vapor Compression ◽  
Refrigeration Unit ◽  
Vapor Compression Refrigeration

In this paper, a scheme of hybrid desiccant dehumidification system was proposed. This system can recovery the condensing heat from the vapor compression refrigeration unit to remove moisture from the air. But the trick of energy saving is the sensible heat exchanger after the desiccant rotary wheel. After analysis of its energy consumption characteristic, the system model was established.

scholarly journals АНАЛІЗ ЕФЕКТИВНОСТІ ОХОЛОДЖЕННЯ ПОВІТРЯ КОГЕНЕРАЦІЙНОГО ГАЗОПОРШНЕВОГО МОДУЛЯ УСТАНОВКИ АВТОНОМНОГО ЕНЕРГОЗАБЕЗПЕЧЕННЯ

2019 ◽  
pp. 76-80
Author(s):  
Андрій Миколайович Радченко ◽  
Анатолій Анатолійович Зубарєв ◽  
Сергій Георгійович Фордуй ◽  
Володимир Володимирович Бойчук ◽  
Віталій Васильович Цуцман
Keyword(s):  
Air Temperature ◽  
Elevated Temperatures ◽  
Cooling System ◽  
Electric Energy ◽  
Ambient Air ◽  
Hot Water ◽  
Lubricating Oil ◽  
Air Cooling ◽  
Air Conditioner ◽  
Engine Room

The analysis of the efficiency of cooling air of cogeneration gas-piston module of installations for combined production of electric energy, heat, and cold is performed. The installation for energy supply includes two JMS 420 GS-N.LC GE Jenbacher cogeneration gas-piston engines manufactured as cogeneration modules with heat exchangers for removing the heat of exhaust gases, scavenge gas-air mixture, cooling water of engine and lubricating oil. The heat of hot water is transformed by the absorption lithium-bromide chiller AR-D500L2 Century into the cold, which is spent on technological needs and for the operation of the central air conditioner for cooling the incoming air of the engine room, wherefrom it is sucked by the turbocharger of the engine. The temperature of the scavenge gas-air mixture at the entrance to the working cylinders of the engine is maintained by the system of recirculating cooling with the removal of its heat into surroundings by the radiator. Because of significant heat influx from working engines and other equipment, as well as through the enclosures of the engine room from the outside to the air-cooled in the central air conditioner in the engine room, from where it is sucked by a turbocharger, the air temperature at the inlet of the turbocharger is quite high: 25...30 °C. At elevated temperatures of the ambient air at the inlet of the radiator for cooling scavenge gas-air mixture and the air at the turbocharger inlet the fuel economy of engine is falling, which indicates the need for efficient cooling of air. The efficiency of cooling the air of the gas-piston module was estimated by a reduction in the consumption of gaseous fuel and the increase in electric power of the engine. For this purpose, the data of monitoring on the fuel efficiency of the gas-piston engine with the combined influence of the ambient air temperature at the inlet of the radiator and the air at the turbocharger inlet were processed to obtain data on their separate effects and to determine the ways to further improve the air cooling system of the gas-piston module.

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.

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