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    Investigation of Flow Rate and Cooling Water Temperature Effects on the Process Parameters in Centrifuge Machine

    , M.Sc. Thesis Sharif University of Technology Aghaei, Majid (Author) ; Otukesh, Mohammad (Supervisor) ; Safdari, Jaber (Supervisor)
    Abstract
    Centrifuge is a method in which great gravitational-like forces are used. Gravitational forces which cause molecules to move and are relevant to molecular weight; can cause isotope separation. The separation of light isotope from heavy one is done with a centrifugal field which produces a pressure gradient for the gas mixture. Pressure gradient is different for each of the isotopes due to the dependence of pressure gradient to the mass of the materials. But the separation in this way is very limited. The capacity of separation can be brought up by producing an additional axial flow in the rotor. This rotational flow can be produced with internal or external incitement. Rotational flow with... 

    An innovative solar assisted desiccant-based evaporative cooling system for co-production of water and cooling in hot and humid climates

    , Article Energy Conversion and Management ; Volume 185 , 2019 , Pages 396-409 ; 01968904 (ISSN) Heidari, A ; Roshandel, R ; Vakiloroaya, V ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    Although evaporative coolers consume much lower electricity than the vapor compression systems, they are not applicable in humid climates. Combination of desiccant wheels and evaporative coolers, known as desiccant-based evaporative cooling systems, allows evaporative coolers to be used in humid climates, which provide significant energy and environmental advantages with respect to vapor compression systems. However, one of the main disadvantages of evaporative cooling is the high water. Regarding the global water crisis, a cooling system which saves both water and energy will be an attractive alternative to the current cooling systems. To this aim, this paper presents a novel... 

    Application of ozone treatment and pinch technology in cooling water systems design for water and energy conservation

    , Article International Journal of Energy Research ; Volume 34, Issue 6 , 2010 , Pages 494-506 ; 0363907X (ISSN) Ataei, A ; Gharaie, M ; Parand, R ; Panjeshahi, E ; Sharif University of Technology
    2010
    Abstract
    Re-circulating cooling water systems offer the means to remove heat from a wide variety of industrial processes that generate excess heat. Such systems consist of a cooling tower and a heat-exchanger network that conventionally has a parallel configuration. However, reuse of water between different cooling duties allows cooling water networks to be designed in a series arrangement. This results in performance improvement and increased cooling tower capacity. In addition, by the integration of ozone treatment into the cooling tower, the cycle of concentration can be increased. The ozone treatment also dramatically reduces the blow-down that, in turn, is environmentally constructive. In this... 

    Water-energy nexus approach for optimal design of hybrid cooling system in direct reduction of iron plant

    , Article Journal of Cleaner Production ; Volume 287 , 2021 ; 09596526 (ISSN) Hashemi Beni, M ; Morad Bazofti, M ; Akbari Mohammadi, A ; Mokhtari, H ; Saboohi, Y ; Golkar, B ; Ghandi, A. H ; Sharif University of Technology
    Elsevier Ltd  2021
    Abstract
    Direct reduction of iron process in steel industry has special production conditions. Low quality cooling water, low cold and high hot cooling water temperature, space limitation for new equipment installation, high value-added of product and severe effect of cooling water temperature on production rate are of these conditions. Considering technical and economic constraints and limitations, this situation makes this process an attractive case study for converting the existing wet cooling tower to hybrid cooling system. In this paper, based on integration of process, dry and wet cooling system and ambient conditions profiles, a new method for designing hybrid cooling system has been proposed.... 

    Exergetic optimization of a PEM fuel cell for domestic hot water heater

    , Article Journal of Fuel Cell Science and Technology ; Volume 2, Issue 4 , 2005 , Pages 284-289 ; 1550624X (ISSN) Saidi, M. H ; Abbassi, A ; Ehyaei, M ; Sharif University of Technology
    2005
    Abstract
    In this paper, a 5 kW PEM fuel cell including burner, steam reformer, and water heater for domestic application has been considered. Water is used for cooling of the fuel cell. Cold water is passed through a cooling channel, warmed up and used for domestic water heating. To increase the efficiency, outlet steam of fuel cell is fed to the reformer. The perfomance of the system is optimized by exergy analysis based on the second law of thermodynamics. Also, the effect of burner, fuel cell temperature and stoichiometric air fuel ratio are investigated. In this analysis, pressure loss in the fuel cell and heat transfer of the cooling channel are taken into account whereas, pressure loss in... 

    Experimental study of forced circulation evaporator in zero discharge desalination process

    , Article Desalination ; Volume 285 , January , 2012 , Pages 352-358 ; 00119164 (ISSN) Farahbod, F ; Mowla, D ; Jafari Nasr, M. R ; Soltanieh, M ; Sharif University of Technology
    Abstract
    Zero discharge desalination process is the most promising technology to prevent salinity and thermal shocks to ecosystem by effluent streams of desalination unit drained into the sea. Pretreatment, solar pond and forced circulation crystallizer are the major steps of one option to provide the purposes of zero discharge desalination process. Reduction of total hardness of wastewater occurs in pretreatment unit and the solar pond is proposed for effluent concentrated brine wastewater of pretreatment unit which seeks production of potable water and concentrated brine. The effluent stream from solar pond is conveyed to one forced circulation evaporator in order to produce salt and distilled... 

    Experimental analysis of a cooling system effect on photovoltaic panels’ efficiency and its preheating water production

    , Article Renewable Energy ; 2018 ; 09601481 (ISSN) Fakouriyan, S ; Saboohi, Y ; Fathi, A ; Sharif University of Technology
    Elsevier Ltd  2018
    Abstract
    This paper addresses a low complexity and high efficient cooling system applicable on photovoltaic (PV) system leading to enhance electrical efficiency and provide preheated water. The developed system consists of a photovoltaic panel, a cooling water system establishing a uniform surface temperature, and a solar water heater. According to the proposed system characteristics, the setup is constructed based on a single mono-crystalline solar panel to absorb more solar radiation intensity and generate more electrical energy per area in compare to a poly-crystalline panel. The preheated water produced by absorbed heat from the photovoltaic is conducted to a solar water heater to satisfy... 

    Experimental analysis of a cooling system effect on photovoltaic panels' efficiency and its preheating water production

    , Article Renewable Energy ; 2019 , Pages 1362-1368 ; 09601481 (ISSN) Fakouriyan, S ; Saboohi, Y ; Fathi, A ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    This paper addresses a low complexity and high efficient cooling system applicable on photovoltaic (PV) system leading to enhance electrical efficiency and provide preheated water. The developed system consists of a photovoltaic panel, a cooling water system establishing a uniform surface temperature, and a solar water heater. According to the proposed system characteristics, the setup is constructed based on a single mono-crystalline solar panel to absorb more solar radiation intensity and generate more electrical energy per area in compare to a poly-crystalline panel. The preheated water produced by absorbed heat from the photovoltaic is conducted to a solar water heater to satisfy... 

    Modeling of thermal pollution in coastal area and its economical and environmental assessment

    , Article International Journal of Environmental Science and Technology ; Volume 2, Issue 1 , 2005 , Pages 13-26 ; 17351472 (ISSN) Abbaspour, M ; Javid, A. H ; Moghimi, P ; Kayhan, K ; Sharif University of Technology
    CEERS  2005
    Abstract
    The Persian Gulf is one of the aquatic ecosystems which has recently faced with different pollutions. Cooling water discharges due to various industries such as power plants can cause important disorders on present ecosystem balance because of its high temperature. Obviously, due to thermal pollution, a great number of aquatic creatures face with a new situation that they can not tolerate. Thermal pollution leads to their migration, creates a potential for new coming species which in turn can thoroughly change the marine ecosystem feature. The other impacts of this phenomenon are: disorders in reproduction, nourishment and other biological habits. In this research, thermal pollution due to...