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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An?lise te?rico-experimental do coeficiente de perfomance (COP) de um sistema de refrigera??o por jato-compress?o

Vargas, Luiz Carlos Pereira 26 April 2010 (has links)
Made available in DSpace on 2014-12-17T14:58:05Z (GMT). No. of bitstreams: 1 LuizCPV_DISSERT.pdf: 4145604 bytes, checksum: cc3f28e35e926d7f9d6bd3a0d675dcd3 (MD5) Previous issue date: 2010-04-26 / The use of waste heat of energy conversion equipment to produce a cooling effect, consists currently in a very interesting way of efficiency improvement of energy systems. The present research has as intention the theoretical and experimental study of a new intermittent refrigeration system ejector cycle characteristics, with use of waste heat. Initially, was doing a bibliographical survey about the vapor ejector refrigeration system technology. In the following stage was doing a simulation of the corresponding thermodynamic cycle, with preliminarily intention to evaluate the performance of the system for different refrigerants fluids. On the basis of the results of the simulation were selected the refrigerant fluid and developed an experimental group of benches of the refrigeration system considered, where pressure and temperature sensory had been inserted in strategical points of the refrigeration archetype and connected to a computerized data acquisition system for measure the refrigerant fluid properties in the thermodynamic cycle. The test results obtained show good agreement with the literature / A utiliza??o do calor residual de equipamentos para convers?o de energia para produzir frio, ? uma forma de melhoria da efici?ncia dos sistemas energ?ticos. A presente pesquisa destina-se ao estudo te?rico e experimental das caracter?sticas de um novo sistema de refrigera??o intermitente por jato-compress?o (ejetor) com uso de calor residual. Inicialmente, foi realizado um levantamento bibliogr?fico sobre a tecnologia de sistemas de refrigera??o por jato-compress?o. Na fase seguinte, investigou-se a concep??o do principal elemento da proposta de sistema de refrigera??o, o ejetor. A metodologia emp?rica utilizada no c?lculo do ejetor est? dispon?vel na literatura. Com o aux?lio do software EES (Engineering Equation Solver) foram realizados estudos (simula??es) para diferentes fluidos refrigerantes sint?ticos. O fluido refrigerante R141b apresentou as propriedades termodin?micas e de transporte necess?rios para o funcionamento eficaz do sistema proposto. Com base nos resultados da simula??o foi selecionado o fluido refrigerante e desenvolvida uma bancada experimental do sistema de refrigera??o proposto, onde sensores de press?o e temperatura foram inseridos em pontos estrat?gicos do prot?tipo de refrigera??o e conectados a um sistema de aquisi??o de dados computadorizado para medi??o das propriedades do fluido refrigerante no ciclo termodin?mico. Os resultados obtidos nos ensaios revelam boa concord?ncia com os encontrados na literatura

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