Search for: freshwater
0.006 seconds

    Seawater desalination via waste heat recovery from generator of wind turbines: How economical is it to use a hybrid hdh-ro unit?

    , Article Sustainability (Switzerland) ; Volume 13, Issue 14 , 2021 ; 20711050 (ISSN) Rostamzadeh, H ; Rostami, S ; Amidpour, M ; He, W ; Han, D ; Sharif University of Technology
    MDPI AG  2021
    Over recent years, the concept of waste heat recovery from the generators of wind turbines for driving a thermal-driven desalination system was introduced, and its advantages were highlighted. However, any selection of a bottoming thermal-driven desalination system among different existing technologies should be taken under consideration before making an ultimate recommendation. Unfortunately, no comprehensive comparison is available in the literature to compare the performance as well as the cost aspects of using the waste thermal energy of the generator of a wind turbine for desalinating seawater, comparing them with those of a layout where the power of the wind turbine is directly... 

    Two-dimensional numerical solution of steady withdrawal from the lens of freshwater in a tropical island

    , Article 2006 2nd ASME Joint U.S.-European Fluids Engineering Summer Meeting, FEDSM 2006, Miami, FL, 17 July 2006 through 20 July 2006 ; Volume 2006 , 2006 ; 0791837831 (ISBN); 9780791837832 (ISBN) Jabbari, E ; Haji Mohammadi, M ; Saeedpanah, I ; Sharif University of Technology
    The work presented here is a study of the steady withdrawal of water from the lens of freshwater situated above the ocean's salt water and within the island. It is the aim of this paper to investigate the process of withdrawal from the lens of freshwater with a view to establishing the critical flow values for withdrawal and the effects of sink location and density differences on these values, and also to determine the effects of relative density differences. Steady solutions are found for the shape of the interface between salt and freshwater beneath a tropical island. A Green_s function approach is used and proves to be much more robust than spectral methods. Computations of the surface... 

    An industrial application of low-grade sensible waste heat driven seawater desalination: a case study

    , Article Desalination ; Volume 470 , 2019 ; 00119164 (ISSN) Rahimi, B ; Marvi, Z ; Alamolhoda, A. A ; Abbaspour, M ; Chua, H. T ; Sharif University of Technology
    Elsevier B.V  2019
    This paper reports on the application of low-grade sensible waste heat (liquid phase) driven multi-effect distillation (MED) technology to exploit waste heat sources that are generally abundant in the petrochemical industries especially, those located close to the Persian Gulf's coastline. For this purpose, a techno-economic feasibility study by considering local capital and operating costs for a selected petrochemical plant has been conducted. In this study, a sensible waste heat stream (practically at 80 °C in the liquid phase), which is actively cooled by the cooling process of the plant, is considered as the heat source for the proposed desalination process. This process can recover... 

    Role of exchange flow in salt water balance of Urmia Lake

    , Article Dynamics of Atmospheres and Oceans ; Vol. 65, issue , 2014 , pp. 1-16 ; ISSN: 03770265 Marjani, A ; Jamali, M ; Sharif University of Technology
    In this paper we examine how exchange flow in Urmia Lake plays a crucial role in dynamics of the lake. Urmia Lake, a very large hyper-saline lake of high ecological significance, is located in northwest of Iran with a 15-km causeway dividing it into north and south lakes. A 1250-m opening in the causeway near the east coast links the two lakes. The differences in mean water levels and densities of the two lakes increase in spring due to large freshwater inflows into the south lake. High evaporation dominates the lake in summer. By incorporating the results of a two-layer hydraulics theory into a mixing model of the lake, we show that the exchange flow through the opening diminishes the water... 

    Physico-chemical and biological characteristics of Sarabs (spring pools) in the Kermanshah Province of Iran

    , Article Iranian Journal of Science and Technology, Transaction B: Engineering ; Volume 30, Issue 5 , 2006 , Pages 621-635 ; 03601307 (ISSN) Khatami, S.H ; Shayegan, S. J ; Sharif University of Technology
    Sarabs (spring-fed pools) are an important natural freshwater resource in Iran where they are used for potable, agricultural and recreational purposes. A survey of 17 Sarabs was undertaken in the Province of Kermanshah to obtain data on their water quality and biology which would help inform future management of these multifunctional resources. These Sarabs differed greatly in size (50-30000m2 surface area) and were situated at altitudes of between 622 and 1697 m above sea level. The average dissolved oxygen content and pH of the water was between 4.5 and 10mg O2/1, and 6.95 and 7.6 respectively. The Sarabs differed particularly in their dissolved solids content from 100μS/cm (detectable... 

    Semianalytical solutions for contaminant transport under variable velocity field in a coastal aquifer

    , Article Journal of Hydrology ; Volume 560 , 2018 , Pages 434-450 ; 00221694 (ISSN) Koohbor, B ; Fahs, M ; Ataie Ashtiani, B ; Simmons, C. T ; Younes, A ; Sharif University of Technology
    Elsevier B.V  2018
    Existing closed-form solutions of contaminant transport problems are limited by the mathematically convenient assumption of uniform flow. These solutions cannot be used to investigate contaminant transport in coastal aquifers where seawater intrusion induces a variable velocity field. An adaptation of the Fourier-Galerkin method is introduced to obtain semi-analytical solutions for contaminant transport in a confined coastal aquifer in which the saltwater wedge is in equilibrium with a freshwater discharge flow. Two scenarios dealing with contaminant leakage from the aquifer top surface and contaminant migration from a source at the landward boundary are considered. Robust implementation of... 

    Freshwater and cooling production via integration of an ethane ejector expander transcritical refrigeration cycle and a humidification-dehumidification unit

    , Article Desalination ; Volume 477 , 2020 Gholizadeh, T ; Vajdi, M ; Rostamzadeh, H ; Sharif University of Technology
    Elsevier B.V  2020
    Despite the fact that humidification-dehumidification (HDH) desalination systems can be driven by various renewable or waste heat energies, many of the available renewable technologies are expensive in some parts of the globe. Hence, proposing and developing high-efficient mechanical-based HDH units can be an encouraging alternative which is more highlighted in recent investigations. In pursuance of this objective, three innovative mechanical-driven HDH units are simulated and the results are compared with each other. The simulated hybrid desalination system consists of a HDH unit and an ethane ejector expander transcritical refrigeration cycle (ethane-EETRC). The simulated hybrid systems...