Applying Simulation Technique of Vapor-Compression Refrigeration

2021 ◽  
Vol 7 (4) ◽  
Keyword(s):  
System Analysis ◽  
Web Pages ◽  
Vapor Compression ◽  
Intensive Courses ◽  
Engineering Software ◽  
Interactive Tools ◽  
Vapor Compression Refrigeration ◽  
R 134A ◽  
College Of Engineering ◽  
Microsoft Windows

Calculation intensive courses lead to the need to integrate computer technology into the classroom, especially in courses such as The Refrigeration and air conditioning at then Dronacharya College of Engineering Gurugram (Haryana). Therefore the opportunity arises for the implementation of interactive tools for ease of calculations. Once the students have mastered the concepts and ability to perform the necessary manual calculations, computer programs can be used to allow the students to study more advanced topics in the material without being bogged down in the calculations. To ease the considerable calculations involved in solving vapor-compression refrigeration (VCR) cycle. This program has recently been revised to be compatible with the Microsoft Windows operating environment prevalent today in engineering software. In addition, a fourth refrigerant, R-134a, was added to account for the addition of new refrigerants in use today. Another modification made to the program was the addition of a tutorial for the thermal system analysis of a VCR cycle. This tutorial emulates the general solution methodology used in the course and reinforces the concepts with the students. The program is available via current web pages for the described course.

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.

A DROP-IN ANALYSIS OF THE PERFORMANCE OF R-22 WITH R-134A FOR A DOSMETIC VAPOR COMPRESSION REFRIGERATION SYSTEM

2019 ◽  
Author(s):  
Lucas Silva ◽  
JOÃO PEDRO ◽  
Ewerton Augusto Sousa Nogueira ◽  
José Felipe Dias ◽  
Sabrina Nogueira Rabelo
Keyword(s):  
Vapor Compression ◽  
Refrigeration System ◽  
Vapor Compression Refrigeration ◽  
R 134A

Experimental Investigation of Vapor Compression Refrigeration System Performance Using Nano-Refrigerant

2014 ◽  
Vol 2 (2) ◽  
pp. 12-27
Author(s):  
Ahmed J. Hamad
Keyword(s):  
Experimental Investigation ◽  
System Performance ◽  
Cuo Nanoparticles ◽  
Working Fluid ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Test Rig ◽  
Vapor Compression Refrigeration ◽  
R 134A ◽  
Thermo Physical Properties

     Experimental investigation of vapor compression refrigeration system performance using Nano-refrigerant is presented in this work. Nano-refrigerant was prepared in current work by mixing 50 nanometers diameter of copper oxide CuO nanoparticles with Polyolester lubrication oil and added to the compressor of the refrigeration system to be mixed with pure refrigerant R-134a during its circulation through refrigeration system. Three concentrations (0.1%, 0.25%, and 0.4%) of CuO-R134 a Nano-refrigerant are used to study the performance of the refrigeration system test rig and to investigate the effect of using Nano-refrigerant as a working fluid compared with pure refrigerant R-134a. The results showed that, the increasing in concentration of CuO nanoparticles in the Nano-refrigerant will significantly enhance the performance of the refrigeration system, as adding nanoparticles will increase the thermal conductivity, heat transfer and improve the thermo-physical properties of Nano-refrigerant. Investigation of performance parameters for refrigeration system using Nano-refrigerant with 0.4% concentration compared with that for pure refrigerant R-134a shows that, Nano-refrigerant has reflect higher performance in range of 10% and 1.5% increase in COP and refrigeration effect respectively and 7% reduction in power consumption for refrigeration system. It can be concluded that, Nano-refrigerants can be efficiently and economically feasible to be used in the vapor compression refrigeration systems.

scholarly journals Cálculo de la generación de entropía a partir del Proceso de Temperatura Promedio en un sistema de refrigeración por compresión mecánica de vapor con R-134a

2019 ◽  
pp. 1-8
Author(s):  
Carlos Rangel-Romero ◽  
Juan Carlos Rojas-Garnica ◽  
Ricardo Hernández-Lazcano ◽  
Javier Andrey Moreno-Guzmán
Keyword(s):  
Condensation Temperature ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Minimum Entropy ◽  
Compression Process ◽  
Average Temperature ◽  
Vapor Compression Refrigeration ◽  
R 134A ◽  
Main Components ◽  
Minimum Entropy Generation

The Average Temperature Process (PAT) is modeled by an equation that is used to calculate the increase in energy needed for the refrigeration cycle, which is equivalent to the energy degradation that corresponds to the production of entropy. This work shows experimentally that the increase in entropy, taking into account the processes of heat transfer that occur in the condensation temperature and in the evaporation temperature between the mechanical vapor compression refrigeration system and the environment, is directly related to the falls of pressure presented in the suction pipe and in the compression process, as well as the heat losses that exist between the main components (evaporator, compressor, condenser and expansion throttling) and the environment. From this development, the behavior of the refrigeration cycle is evaluated in order to obtain a minimum entropy generation criterion in the main components. Analytical as well as experimental results are shown using R-134a refrigerant.

scholarly journals Análisis de la generación de las irreversibilidades a partir del Coeficiente de Operación en un sistema de refrigeración por compresión mecánica de vapor con R-134a

2019 ◽  
pp. 10-15
Author(s):  
Carlos Rangel-Romero ◽  
Juan Carlos Rojas-Garnica ◽  
Guillermo Flores-Martínez ◽  
Antonio Barcelata-Pinzón
Keyword(s):  
Vapor Compression ◽  
Refrigeration System ◽  
Pressure Drops ◽  
Liquid Line ◽  
Expansion Valve ◽  
Individual Contributions ◽  
Suction Line ◽  
Vapor Compression Refrigeration ◽  
R 134A ◽  
Mathematical Process

This paper presents the development of individual contributions, in the generation of irreversibilities, of a refrigeration system based on the Coefficient of Operation (COP). The generation of irreversibilities has been widely analyzed using the principles of the first and second laws of thermodynamics. This analysis uses the parameters of enthalpy, entropy as well as the temperature and heat generated in each component. The method proposed in this work improves the accuracy of the calculations due to the use of the COP in the mathematical process, which includes the processes of heat transfer and pressure drops developed in the evaporator, suction line, compressor, discharge line, condenser, liquid line and expansion valve of the mechanical vapor compression refrigeration system. The mathematical analyzes and the experimental results are shown, with these it is concluded that the exposed procedure is closer to the real conditions than those traditional procedures found in the text books.

Development of a Miniature Vapor-Compression Refrigeration System for Computer CPU Cooling

2013 ◽  
Vol 321-324 ◽  
pp. 383-386
Author(s):  
Yu Fei Yang ◽  
Wei Xing Yuan ◽  
Yi Bin Liao
Keyword(s):  
Core Temperature ◽  
Heat Dissipation ◽  
High Heat ◽  
High Heat Flux ◽  
Cold Plate ◽  
Vapor Compression ◽  
Refrigeration System ◽  
The Core ◽  
Vapor Compression Refrigeration ◽  
R 134A

A miniature vapor-compression refrigeration system for cooling high power CPUs has been developed and tested. The refrigeration system is so small that it can be embedded into the computer case. The refrigerant used in the system is R-134a. The system consists of a miniature rotary DC compressor, a micro-channel condenser, a specially designed cold plate, a short tube restrictor, and related controlling electronics. The compressor is powered directly by the 12V DC power supply of the computer. The cold plate contacts the CPU surface directly and carries away the heat dissipation by conductivity. In a series of tests to cool an Intel Core i7-990X CPU that has 12 cores inside with the refrigeration system, the CPU core temperature can be kept at 23°C in default frequency 3.5GHz and 100% of workload. When the CPU is overclocked to 4.8GHz, the core temperature can be maintained at 59°C. Even when overclocked to 5.0GHz, the core temperature does not exceed 78°C. The test results validate the ability and potential of using vapor-compression refrigeration technology in high heat flux CPU cooling.

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