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Experimental investigation of a multi-effect active solar still: The effect of the number of stages
, Article Applied Energy ; Volume 137 , 2015 , Pages 46-55 ; 03062619 (ISSN) ; Feilizadeh, M ; Jafarpur, K ; Feilizadeh, M ; Rahimpour, M. R ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
In this work, the effect of the number of stages on the productivity of a multi-effect active solar still was experimentally investigated for the first time. Moreover, system performances in continuous and non-continuous modes were compared. For this purpose, indoor experiments were conducted on 4 similar solar still devices with different stages (1-4 stages) in order to accurately control the environmental conditions. In addition, water production was hourly measured during the whole 24-h experiment. The results show that with increased number of stages, distillate production can be predicted with a quadratic function. Moreover, adding a maximum of 6 and 10 additional stages can...
Experimental Investigation of the Performance of Multiple Effect Active Solar Stills
, M.Sc. Thesis Sharif University of Technology ; Roostaazad, Reza (Supervisor) ; Jafarpur, Khosrow (Co-Advisor) ; Maghsoodi, Vida (Co-Advisor)
Abstract
Energy and environmental crises force different countries to consider new clean sources of energy, especially renewable energies. Fortunately, Iran is located on the solar belt and has a great potential to utilize this huge source of clean, sustainable, accessible and cheap energy. One of the applications of the solar energy is desalination of salty and polluted waters. In this regard, the performance of Multiple Active Solar Stills is investigated in this research. To do so, four similar samples of this device with one, two, three and four stages, were constructed on which many experiments were conducted for 24 hours periods. Experiments were conducted in both continuous (several days) and...
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 ; 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...
Experimental investigation of the effect of solar collecting area on the performance of active solar stills with different brine depths
, Article Desalination ; Volume 358 , 2015 , Pages 76-83 ; 00119164 (ISSN) ; Taghvaei, H ; Jafarpur, K ; Feilizadeh, M ; Karimi Estahbanati, M. R ; Sharif University of Technology
Abstract
Solar collecting area is one of the most important operating parameters of active solar stills. No experimental work has been performed to investigate the effect of this parameter to date. Furthermore in all of previous theoretical studies the effect of solar collecting area was examined during only the first 24-hour period of the operation of stills with one specified brine depth. However the present work experimentally studies the long-term simultaneous effects of collector area and brine depth on the performance of active solar stills. For this purpose four parallel active solar stills with different collector areas were fabricated and experiments were conducted for 5 consecutive days...
Modeling and Experimental Investigation of a solar Hybrid System to Produce Freshwater from Waste Heat of Photovoltaic Module by Using Thermosyphon heat pipes with different Configurations
, M.Sc. Thesis Sharif University of Technology ; Behshad Shafii, Mohammad (Supervisor) ; Roshandel, Ramin (Supervisor)
Abstract
With regard to an increasing world population and the constant capacity of water resources, new and valid methods should be implemented to preserve freshwater resources and accordingly produce drinking water. In the present study, a solar hybrid system was studied by experimental and theoretical means to facilitate the transformation of waste heat from photovoltaic module (PV module) into useful heat that can be used in a solar desalination (SD) system for freshwater production purposes. The study aimed to fabricate a SD system by using both PV module and thermosyphon heat pipes (THPs) technologies in a single system. In the modeling section, the goal is to present a comprehensive model...
Design and Fabrication of Humidifier-Dehumidifier with Bubble Column Method and Heat Recovery
, M.Sc. Thesis Sharif University of Technology ; Moosavi, Ali (Supervisor)
Abstract
In present Thesis, the HDH desalination system has designed and fabricated based on three different functions. Two-stage bubble column humidification-dehumidification system, heat recovery converter, and the elimination of the cooling system are among the innovations of this study.Also, the desalination system is processed and controlled by a control system based on the Python language. The experiment is designed for three different systems based on the three different functions, different maximum temperatures and different mass ratios of water to air have been taken into account. Essential parameters of HDH systems have been analyzed in this study. The experimental results have pointed out...
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) ; 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) ; 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. =...