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A novel energy storage system for latent heat recovery in solar still using phase change material and pulsating heat pipe
, Article Renewable Energy ; Volume 163 , 2021 , Pages 2115-2127 ; 09601481 (ISSN) ; Rajabi Ghahnavieh, A ; Shafii, M. B ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
In this study, a latent heat storage unit and built-in condenser were integrated with a solar still. Storage of dissipated latent heat of vapor during the day and using it after sunset prolongs system operation. During the day, the entire solar radiation was consumed to heat the saline water and only the heat coming from the condensation of vapor was stored in the phase change material (PCM). The dissipated heat from the condenser body was transferred to the PCM and stored. Additionally, the existence of PCM on the outer surfaces of the condenser prevented the rise of condenser wall temperature during the day and kept the condenser temperature low. After sunset, the heat stored in the PCM...
Latent Heat Energy Vapor Storage in Phase Change Materials in Solar Stills
, M.Sc. Thesis Sharif University of Technology ; Rajabi, Abbas (Supervisor) ; Shafie, Mohammad Behshad (Supervisor)
Abstract
Providing fresh water, ending fossil fuels, using renewable energy and achieving a clean biological environment in different parts of the world especially in Iran beside having access to many saline water sources, Shows the need for research in the field of solar still desalination. The goal of current study is to increase the performance of the solar still system through the use of an energy storage system and an additional condenser. Adding an additional condenser to a conventional solar still lead to an increase in the rate of evaporation and consequently increase the production of the system. Also, by collecting distilled water from the sidewalls, the amount of water produced...
Acceleration of Image Reconstruction on the Magnetic Resonance Imaging System
, M.Sc. Thesis Sharif University of Technology ; Vossoughi, Nasser (Supervisor) ; Vosughi Vahdat, Bijan (Supervisor) ; Zamani, Pooria ($item.subfieldsMap.e)
Abstract
Magnetic Resonance Imaging ,MRI, although as one of the most advanced medical imaging equipment is well known but compared to other medical imaging systems needs more time to imaging, so it has caused the patient dissatisfaction. According to the recently researches, filling the image data in a space of information that called ‘k-space’, in the process of image reconstruction, is the main reason of slow MRI. Image reconstruction methods for accelerating like half scan based on image reconstruction by using only a part of k-space is used in MRI systems today, but this method is associated with lower SNR image. Recent research on the theory of compressed sensing has been opened a new approach...