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Heat and Mass Transfer in a Finite Channel

Tohidloo, Mahdi | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56475 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. The need for cooling and creating thermal comfort conditions for human life is one of today's severe challenges. Therefore, development and innovation to enhance the efficiency of these systems are of great importance. Among the new ideas proposed in this domain, we can mention the M-cycle, which can greatly improve the energy consumption for cooling systems in this sector. In this cycle, the desired cooling is produced by utilizing the latent heat of water evaporation, which is considered a kind of renewable energy. The systems based on this cycle are still under development, and for this reason, there is a necessity to better investigate the heat and mass transfer in the aforementioned systems. In this project, first, the various applications of the M cycle are described and then the physical equations governing this cycle are investigated. Using the principles of computational fluid dynamics, the relevant equations have been solved with the help of Comsol multiphysics software. The cross-flow heat and mass exchanger (HMX) on the air transmission ducts between the dry channel and the wet channels has been simulated and optimized. it has been noted that reducing the cross-section of each channel by a factor of 10% compared to the previous channel is the most optimal mode. For the counterflow HMX, the effect of channel length and different environmental conditions has been investigated. In this way, return flow exchangers with a length of more than 80 cm for cooling water and a length of more than 2.4 meters for cooling air in all weather conditions have better performance compared to conventional cooling systems. The performance of this system in hybrid mode with the combination of HMX based on M cycle theory and Vapor-compression refrigeration systems instead of conventional air-cooled condensers has been investigated to reduce the energy consumption of industrial cold stores, and an average increase of 68% in coefficient of Performance (COP) is observed. The highest increase in efficiency is related to hot cities like Ahvaz and Bushehr with 90% and the lowest increase in efficiency is related to Arid Cities like Rasht with 26%
  9. Keywords:
  10. Mass Transfer ; Heat Transfer ; Evaporal Colling ; Innovative Cooler ; M Cycle ; Energy Efficiency

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