Design and simulation of a vapor compression refrigeration cycle for a micro refrigerator

Download

index.pdf

Date

2010

Author

Yıldız, Seyfettin

Metadata

Show full item record

Item Usage Stats

370
views

113
downloads

Cooling of electronic equipments has become an important issue as the advances in technology enabled the fabrication of very small devices. The main challenge in cooling is the space limitation. The use of miniature refrigerators seems to be a solution alternative for the cooling problem. The objective of this study is to design and simulate a vapor compression refrigeration cycle for a micro-scale refrigerator. A MATLAB code is developed for the simulations. The four components of the refrigerator, namely, the condenser, evaporator, compressor and the capillary tube are designed separately. The cycle is successfully completed nearly at the same point where it begins. The cold space temperature, ambient air temperature, condensation and evaporation temperatures, and the evaporator heat load are the predetermined parameters. A fan is used to cool the condenser, and the compressor is selected as isentropic. R-134A is selected as the refrigerant and a simple interpolation code is developed to obtain the thermophysical properties of R-134A. The original design is carried out with an isentropic compressor. For the purpose of comparison, a cycle with a polytropic compressor is also considered. Similarly, two alternative designs for the evaporator are developed and simulated. A second law analysis is performed at the end of the study.

Subject Keywords

Mechanical engineering.

URI

http://etd.lib.metu.edu.tr/upload/12612133/index.pdf
https://hdl.handle.net/11511/19712

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Design and experimental investigation of microchannel heat exchanger Çetin, Murat; Güvenç Yazıcıoğlu, Almıla; Department of Mechanical Engineering (2010) Due to the high performance of electronic components, the heat generation is increasing dramatically. Heat dissipation becomes a significant issue in efficiency promotion and stable operation. Microchannels are of current interest for use in heat exchangers where very high heat transfer performance is desired. Microchannels provide high heat transfer coefficients because of their small hydraulic diameters. In this study, the design and experimental investigation of fluid flow and heat transfer in a microcha...
Development of a web-based dynamic scheduling methodology for a flexible manufacturing cell using agent based distributed internert applications Alataş, Boran; Anlağan, Ömer; Department of Mechanical Engineering (2004) The increasing importance of computer leads to develop new manufacturing methods. One of the most important example; 3unmanned shop floor4 model aims, the mankind can work in jobs that they can be more efficient and more comfortable. As the base of this model, in Middle East Technical University Computer Integrated Manufacturing Laboratory (METUCIM) 3Agent Version 1.14 system is developed. Windows Distributed Internet Applications (DNA) modeling technique is used for the software development. In the develop...
Conceptual design and analysis of an industrial type vacuum sweeper Aygün, Buket; Albayrak, Kahraman; Department of Mechanical Engineering (2009) In this thesis, design and development and manufacturing processes of an industrial type vacuum sweeper is presented. Thesis is financially supported by Ministry of Industry and Trade-Turkey and Müsan A.Ş. (Makina Üretim Sanayi ve Ticaret A.Ş.) under SAN-TEZ project number 00028.STZ.2007-1. It is aimed to make innovative design changes and developments on the Müsan VSM 060 type vacuum sweeper. To achieve this aim, alternative configuration designs are prepared by using commercial 3D modeling program, Catia™...
Modelling part dynamicsin machining processes considering material removal Atlar, Sibel; Özgüven, Hasan Nevzat; Department of Mechanical Engineering (2007) Self-excited chatter vibration in machining is one of the most important limitations on utilizing the increasing productivity of modern machine tools. In order to predict stable depth of cuts at high cutting speeds, the stability lobe diagram for a spindle-tool holder-tool combination must be developed. The frequency response function (FRF) of the system must be known for analytical prediction of the stability lobe diagrams. When the flexibility of the workpiece is important, the workpiece itself should be ...
An investigation on dynamic contact parameters in machining center spindle tool assemblies Özşahin, Orkun; Özgüven, Hasan Nevzat; Department of Mechanical Engineering (2008) In machining centers, with the increasing trends in high precision machining, chatter has become an important problem which results in poor surface finish and low material removal rate. Chatter can be avoided with stability diagrams which provide the stable regions in the machining process for the depth of cut and spindle speed combinations. In order to obtain stability diagrams, tool point frequency response function (FRF) of the system should be obtained. Throughout this study, contact parameters which ar...

Citation Formats

S. Yıldız, “Design and simulation of a vapor compression refrigeration cycle for a micro refrigerator,” M.S. - Master of Science, Middle East Technical University, 2010.