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    A comprehensive comparative investigation on solar heating and cooling technologies from a thermo-economic viewpoint—A dynamic simulation

    , Article Energy Science and Engineering ; Volume 9, Issue 5 , 2021 , Pages 724-742 ; 20500505 (ISSN) Jafari Mosleh, H ; Behnam, P ; Abbasi Kamazani, M ; Mohammadi, O ; Kavian, S ; Ahmadi, P ; Rosen, M. A ; Sharif University of Technology
    John Wiley and Sons Ltd  2021
    Abstract
    The yearly thermo-economic performance is dynamically investigated for three solar heating and cooling systems: solar heating and absorption cooling (SHAC), solar heating and ejector cooling (SHEC), and heating and solar vapor compression cooling (HSVC). First, the effects of important design parameters on the thermo-economic performance of the systems to supply the heating and cooling loads of the building are evaluated. The systems are parametrically analyzed with the weather conditions of Tehran, Iran. The results show that the life cycle costs (LCC) of the SHAC and HSVC systems are alike and much lower than those of the SHEC system. The HSVC system exhibits the best performance from... 

    Numerical and Experimental Investigation of Thermally Driven Exchange Flow and Wind set up in Canopy Steep Area

    , M.Sc. Thesis Sharif University of Technology Davari, Andisheh (Author) ; Jamali, Mirmosaddegh (Supervisor)
    Abstract
    Solar heating in aqautic systems, causes tempreture increasing.This temperature difference will promote an exchange flow between the vegetation and open water. The exchange flow generated by the differential heating and cooling associated with depth variation has also been studied through laboratory experiment and modelling. Differential solar heating can result from shading by rooted emergent aquatic plants, producing a temperature difference between vegetated and unvegetated regions of a surface water body. Horizontal density difference between shaded and open water regions drives currents that carry fluxes between biologically and chemically distinct regions of an aquatic system. Such... 

    Thermally Driven Exchange Flow Between Open Water and Floating Vegetation

    , M.Sc. Thesis Sharif University of Technology Sharifi, Elham (Author) ; Jamali, Mirmosadegh (Supervisor)
    Abstract
    In this thesis, we present the results of a laboratory and numerical model study of the exchange flow generated by the temperature gradient between an open water heated by sunlight and a canopy area made of floating vegetation. Particle Image Velocimetry is employed to obtain the structures of the warm flow intruding the canopy at the surface and the bottom cold return flow for different roots length and vegetation density. Following an initial, transient stage of flow build-up governed by a balance between inertia and buoyancy forces, the flow reaches a steady state in the canopy area with a force balance between buoyancy and vegetation drag dominating the flow within roots. At the steady... 

    A comprehensive comparative investigation on solar heating and cooling technologies from a thermo-economic viewpoint—A dynamic simulation

    , Article Energy Science and Engineering ; December , 2020 Jafari Mosleh, H ; Behnam, P ; Abbasi Kamazani, M ; Mohammadi, O ; Kavian, S ; Ahmadi, P ; Rosen, M. A ; Sharif University of Technology
    John Wiley and Sons Ltd  2020
    Abstract
    The yearly thermo-economic performance is dynamically investigated for three solar heating and cooling systems: solar heating and absorption cooling (SHAC), solar heating and ejector cooling (SHEC), and heating and solar vapor compression cooling (HSVC). First, the effects of important design parameters on the thermo-economic performance of the systems to supply the heating and cooling loads of the building are evaluated. The systems are parametrically analyzed with the weather conditions of Tehran, Iran. The results show that the life cycle costs (LCC) of the SHAC and HSVC systems are alike and much lower than those of the SHEC system. The HSVC system exhibits the best performance from... 

    A thorough investigation of the effects of water depth on the performance of active solar stills

    , Article Desalination ; Vol. 347 , 2014 , Pages 77-85 ; ISSN: 00119164 Taghvaei, H ; Taghvaei, H ; Jafarpur, K ; Karimi Estahbanati, M. R ; Feilizadeh, M ; Feilizadeh, M ; Seddigh Ardekani, A ; Sharif University of Technology
    Abstract
    One of the most important operating parameters which affects the performance and efficiency of active solar stills is brine depth. In all of the previous experimental or theoretical studies, effects of water depth were investigated during only the first 24-hour period (or even shorter periods) of the operation of active solar stills. In other words, only the first day was taken into account. However, the production of an active solar still depends on several parameters such as brine temperature at sunrise (initial temperature), which are all affected by the depth variation after the first day of operation. However, the present research experimentally investigates the long-term effects of... 

    Introducing a dimensionless number as tank selector in hybrid solar thermal energy storage systems

    , Article Journal of Mechanical Science and Technology ; Volume 25, Issue 4 , 2011 , Pages 871-876 ; 1738494X (ISSN) Mohamadi, Z. M ; Zohoor, H ; Sharif University of Technology
    Abstract
    Using hybrid energy storage system is a method for increasing the storage capability of solar thermal energy. If multiple energy storage devices with complementary performance characteristics are used together, the resulting system will be a 'Hybrid Energy Storage System'. In other words, a Hybrid Energy Storage System (HESS) has several media available for storage at any time. In this way, increase in storable energy is obtained without increasing collectors' area. When there are more than one storage mediums, the system should be able to choose the best medium for storing energy according to the conditions. In the previous works, an optimizer program was used to find the proper medium... 

    A new radiation model for a single-slope solar still

    , Article Desalination ; Volume 262, Issue 1-3 , 2010 , Pages 166-173 ; 00119164 (ISSN) Feilizadeh, M ; Soltanieh, M ; Jafarpur, K ; Karimi Estahbanati, M. R ; Sharif University of Technology
    2010
    Abstract
    In this paper, a new radiation model for a single-slope solar still has been developed which for the first time takes into account the effect of all walls of the still on the amount of incident solar radiation on the water surface and each wall. In this model, the walls are projected on the cover to calculate the amount of beam radiation received by any components inside the still. This is in contrary to the previous models in which stills' walls were projected on a horizontal surface and their shadows on the water surface and the walls were either neglected or not computed properly. The predictions of the proposed model are compared with the experimental data obtained in the present work... 

    Optimization of geometrical dimensions of single-slope basin-type solar stills

    , Article Desalination ; Volume 424 , 2017 , Pages 159-168 ; 00119164 (ISSN) Feilizadeh, M ; Soltanieh, M ; Karimi Estahbanati, M. R ; Jafarpur, K ; Ashrafmansouri, S. S ; Sharif University of Technology
    Abstract
    In the present work, effects of height, length, and width of a single-slope basin-type solar still on its distillate production was investigated. For this purpose, a radiation model was developed which accounts for the influences of all walls on quantities of received solar radiation by the base and saline water of the still. Moreover, in this radiation model, the side walls of the still were considered as the trapezoid and the diffuse as well as beam components of solar irradiance were separately taken into account for the first time. Abilities of the present model were compared with earlier ones. Furthermore, the predictions of the current model were compared with the present experimental... 

    Productivity enhancement of solar stills by nano-coating of condensing surface

    , Article Desalination ; Volume 454 , 2019 , Pages 1-9 ; 00119164 (ISSN) Zanganeh, P ; Soltani Goharrizi, A ; Ayatollahi, S ; Feilizadeh, M ; Sharif University of Technology
    Elsevier B.V  2019
    Abstract
    Wettability is one of the most important factors which significantly influences solar still efficiency. Moreover, it determines the condensation mode, i.e., filmwise or dropwise condensation. In the present study, materials with different wettability were applied as the condensing surface to evaluate the effect of wettability on the distillate production of a single slope solar still. To compare the effects of dropwise and filmwise condensation on the condensate yield, the wettability of the condensing surface was changed by applying a nano-silicon solution according to a dip coating technique. All the experiments were conducted at three surface inclination angles. The results revealed that... 

    Nano-coated condensation surfaces enhanced the productivity of the single-slope solar still by changing the condensation mechanism

    , Article Journal of Cleaner Production ; Volume 265 , 2020 Zanganeh, P ; Soltani Goharrizi, A ; Ayatollahi, S ; Feilizadeh, M ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Solar stills are considered an environmentally friendly technique to produce fresh water. The condensation surface plays an essential role in controlling the efficiency of the solar still. This main parameter is critically affected by the wettability of the condensation surface that affects the condensation mechanism, namely drop-wise or film-wise condensation. This study aims to enhance the efficiency of solar stills by altering the surface wettability hence changing the condensation mechanism using nanomaterials. In this experimental work, different condensation surfaces were coated by silicone nanoparticles to change the condensation mechanism from film to dropwise. Scanning electron... 

    Dynamic System Optimal Design Model: Designing and Evaluation of Turboexpander System Operation

    , Ph.D. Dissertation Sharif University of Technology Ebrahimi Saryazdi, Mohammad (Author) ; Saboohi, Yadoolah (Supervisor)
    Abstract
    According to Iran’s energy policies, the natural gas transmission pipeline has expanded significantly over the last decade. Moreover, improving energy efficiency is known as a key strategy in energy policies and programs. Therefore, the need for expansion and development of the rational use of energy has received more and more attention. The use of technologies aimed at energy recovery will be an effective step in this regard. Pressure regulators are most commonly used to reduce this pressure in Iran as one of the significant sources of exergy destruction in Iranian gas transmission system. The turbo-expander system is a kind of technology applied in gas pressure reduction stations to... 

    Effects of amount and mode of input energy on the performance of a multi-stage solar still: An experimental study

    , Article Desalination ; Volume 375 , 2015 , Pages 108-115 ; 00119164 (ISSN) Feilizadeh, M ; Karimi Estahbanati, M. R ; Ardekani, A. S ; Zakeri, S. M. E ; Jafarpur, K ; Sharif University of Technology
    Elsevier  2015
    Abstract
    Effects of the amount and mode of input energy to an active multi-stage solar still were investigated in this work. To control the input energy, an electrical heater controlled by a PLC was utilized to simulate the energy absorbed by solar collectors. The study of the amount of input energy indicated that the freshwater production was a quadratic function of the collector over basin area (CBA) ratio. It was also found that stages 1 to 4 produced about 36%, 26%, 20% and 18% of the overall yield, respectively. Moreover, the effect of employing a thermal energy storage (TES) on the system performance was studied by comparing the mode of feeding energy according to the daily solar radiation... 

    Year-round outdoor experiments on a multi-stage active solar still with different numbers of solar collectors

    , Article Applied Energy ; Volume 152 , 2015 , Pages 39-46 ; 03062619 (ISSN) Feilizadeh, M ; Karimi Estahbanati, M. R ; Jafarpur, K ; Roostaazad, R ; Feilizadeh, M ; Taghvaei, H ; Sharif University of Technology
    Elsevier Ltd  2015
    Abstract
    The present work investigated the outdoor performance of a basin type multi-stage solar still as well as the effect of collector over basin area (CBA) ratio on the distillate production. The effect of CBA was studied in outdoor experiments for the first time. The system consisted of a still coupled with one, two or three flat-plate solar collectors. In order to study the effect of CBA more accurately, the experiments were conducted in both winter and summer. In these experiments, the distilled water production of the multi-stage still was measured during the whole 24. h of a day on an hourly basis. The results revealed that in the winter, the basin coupled to one solar collector (CBA. =... 

    Part load behavior of molten salt cavity receiver solar tower plants under storage mode operational mode

    , Article ASME 2016 10th International Conference on Energy Sustainability, ES 2016, collocated with the ASME 2016 Power Conference and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology, 26 June 2016 through 30 June 2016 ; Volume 1 , 2016 ; 9780791850220 (ISBN) Mostafavi Tehrani, S. S ; Shafiei Ghazani, A ; Taylor, R. A ; Saberi, P ; Sharif University of Technology
    American Society of Mechanical Engineers  2016
    Abstract
    The performance of the tower based concentrated solar thermal (CST-tower) plant is very sensitive to the operation strategy of the plant and the incident heat flux on the receiver. To date, most studies have been examined only the design mode characteristics of the cavity receivers, but this paper significantly expands the literature by considering non-design operating conditions of this important sub-component of the CST-tower plants. A feasible non-design operating conditions of the cavity receivers that was considered in this study is the storage mode of operation. Two practical dynamic control strategies were examined then to find the most efficient approach: fixed solar field mass... 

    Examination of a novel solar still equipped with evacuated tube collectors and thermoelectric modules

    , Article Desalination ; Volume 382 , 2016 , Pages 21-27 ; 00119164 (ISSN) Behshad Shafii, M ; Shahmohamadi, M ; Faegh, M ; Sadrhosseini, H ; Sharif University of Technology
    Elsevier  2016
    Abstract
    In this article, a novel solar still which is equipped with thermoelectric modules to utilize the heat of vapor condensation is experimentally investigated. The use of thermoelectric modules as devices for generating electricity from the temperature difference between two environments (hot vapor steam and cold ambient air) as well as taking outstanding advantages of evacuated tubes as collectors with high performances in adverse climatic conditions, led to utilizing of the energy dissipated due to vapor condensation and a considerable increase in the performance of the system. The effect of using the generated electricity to operate a small propeller fan for inducing forced convection was... 

    Experimental investigation of a solar still equipped with an external heat storage system using phase change materials and heat pipes

    , Article Desalination ; Volume 409 , 2017 , Pages 128-135 ; 00119164 (ISSN) Faegh, M ; Shafii, M. B ; Sharif University of Technology
    Elsevier B.V  2017
    Abstract
    In this study, a novel idea of storing the latent heat of condensing vapor in solar stills by means of phase change materials (PCMs) as a thermal storage is experimentally investigated. During the daytime, the generated water vapor by the solar energy, is conducted to an external condenser filled with PCM to be condensed. The wasted latent heat is absorbed by PCM and thereby stored. It is worth noting that there is no direct contact between the saline water and the PCM, therefore, the solar energy is not directly stored in the PCM. In the evening, the energy stored in the PCM is transferred as heat to the saline water by heat pipes and enables the desalination process to continue. Several... 

    Economic and environmental assessment of a solar-assisted ground source heat pump system in a heating-dominated climate

    , Article International Journal of Environmental Science and Technology ; 2018 , Pages 1-8 ; 17351472 (ISSN) Biglarian, H ; Saidi, M. H ; Abbaspour, M ; Sharif University of Technology
    Center for Environmental and Energy Research and Studies  2018
    Abstract
    In recent years, increasing attention has been paid to the use of renewable energy sources in building sector. The ground source heat pumps are a promising alternative for heating and cooling applications. Despite the high coefficients of performance and significant environmental benefits, their performance may deteriorate over the long-term operation if the annual ground loads are not well balanced. An appropriate solution is the use of hybrid ground source heat pump system through which some portion of the thermal loads can be offset by supplemental components. The aim of this study is to assess the feasibility of a solar-assisted ground source heat pump system for heating a detached house... 

    An experimental evaluation of copper, steel and polypropylene tubes in solar water heaters with thermosyphonic flow

    , Article Applied Solar Energy (English translation of Geliotekhnika) ; Volume 45, Issue 1 , 2009 , Pages 65-69 ; 0003701X (ISSN) Riazi, M. R ; Razavi, J ; Sadeghi, A ; Javaheri, A ; Sharif University of Technology
    2009
    Abstract
    In this paper we report experimental results for the performance and rate of heat transfer in copper tubes in solar water heaters with thermosyphonic flow in continuation of experimental data reported in previous publications (Solar Energy, 2003, vol. 74, pp. 441-445, and Energy Sources, 1997, vol. 19, pp. 147-152). We also show a comparison between performances of three kinds of tubes: copper, polypropylene and steel under similar conditions. An analytical relation for calculation of rate of heat transfer in copper tubes is also presented in terms of Nusselt versus Reynolds and Prantdl numbers. A comparison of experimental data showed that performance of copper tubes is slightly better than... 

    Optimal design for solar greenhouses based on climate conditions

    , Article Renewable Energy ; Volume 145 , 2020 , Pages 1255-1265 Esmaeli, H ; Roshandel, R ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Greenhouses require energy in order to provide a proper environment for crop production. Utilizing solar energy in solar greenhouses is a sustainable solution to face this problem. In this study, a solar greenhouse concept is considered, and a dynamic thermal model is developed to predict the inside air temperature. The model is integrated into an optimization procedure to find the optimal greenhouse design that has the best thermal performance by adjusting its structural parameters. This optimization procedure provides a tool to find the optimal solar greenhouse design for each climate condition and predict its performance. For instance, for the case study of Tehran (Iran), the optimal... 

    Distilled water production with combination of solar still and thermosyphon heat pipe heat exchanger coupled with indirect water bath heater – Experimental study and thermoeconomic analysis

    , Article Applied Thermal Engineering ; Volume 176 , 2020 Rastegar, S ; Kargarsharifabad, H ; Rahbar, N ; Shafii, M. B ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    The aim of this study is to provide a solution for supplying distilled water used in indirect water bath heaters in the pressure reduction stations. A particular type of distilled water production system consists of a typical solar still and a heat pipe heat exchanger was constructed for recovering heat from the exhaust of an indirect gas heater. The system was tested under the climatic conditions of Semnan-Iran. Experimental results showed that in active type, the average daily production rate of distilled water would be 2.06 times higher than passive type. Also, in the proposed system, the average daily energy efficiency and the exergy efficiency would be 65.5% and 41% higher than the...