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Expert: Seeyd Amirhossein Seyed Mousavi
Phone: 82883959
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In this study, a novel freezer consisting of an internal phase change material compartment is compared with an ordinary one. A eutectic mixture of polyethylene glycol has been used which is among the non-flammable and non-toxic phase change materials. The freezer was tested under the standard conditions in the test room both with and without phase change materials loaded in the system and all the temperatures inside the device were monitored for 24 h by the monitoring software. A design of experiment analysis was used and the main goal of this work was to use an optimum amount and temperature of eutectic phase change material inside the freezer. The application of phase change materials in the freezer compartment, located in each tray lea
The catalytic upgrading of beech wood pyrolysis oil has been carried out over iron- and zinc-promoted hierarchical Mordenite Framework Inverted (MFI) zeolites to produce a blendable stream with fluid catalytic cracking (FCC) feed. The iron and zinc were introduced to the zeolite structure in different loadings through the impregnation technique using metal nitrate solutions with various concentrations. The aim was to investigate the effect of zeolite acidity control along with mesoporosity of HZSM-5 zeolite on catalytic upgrading parameters. The results showed that the metal doping reduced textural properties through coverage of the catalyst surface by metal species. The existence of metals also altered acid site distribution of the hierarc
The effect of working fluid inventory and heat input on the performance of thermosyphon is investigated in this paper. First, a thermosyphon with diameter of 16 mm made of steel with toluene as working fluid and the length of the evaporator, adiabatic and condenser section 10, 23 and 17 cm was considered, respectively. The working fluid inventory was considered 0.1, 0.14, 0.18 and 0.24 of total volume of thermosyphon and in each case 54–235 W of heat input applied to the evaporator area also. In order to evaluate the transient behavior of the thermosyphon, in any amount of working fluid, 28 W of heat input was considered and temperature of the evaporator area were recorded at different times. The results showed that in startup, in the val
Energy storage plays an important role in improving the applicability of a wide range of energy systems. Buildings could be considered as a desirable place for this purpose. Incorporating phase change materials (PCMs) as form-stable composites into the building materials has been widely taken into consideration in recent years. However, there are still some shortcomings in applying this technique. In this study, we focused on a surface modification method to prevent leakage of PCM from porous aggregates during heating/cooling cycles. Paraffin (PA) as phase change material was impregnated into the expanded perlite (EP) particles by vacuum impregnation method, and prepared EP/PA composite was coated by a layer of polystyrene. Thermal characte
The purpose of this study is to investigate the effects of rhenium and tin loading (between 0 and 5% by impregnation method) on a ZSM-5 zeolite catalyst as well as the product distribution and aromatic yield under different catalytic conditions. A biomass to catalyst ratio of 5–20 is also considered. Due to its feed characteristics, beechwood was selected as the biomass resource, and the catalytic pyrolysis process was chosen, for it is an economic process. For a better analysis of the product distribution, all product samples were identified using gas chromatography coupled with mass spectrometry. Responses then were analyzed utilizing the full factorial method. The models obtained for high-economic-value produced aromatic and heterocycl
Separation of carbon dioxide in flue gases from the combustion equipment is one of the most serious concerns for industries and especially for the power plants which are the main producers of this pollutant gas. From the various separation methods, vacuum pressure swing adsorption (VPSA) process is attracted interest due to its lower energy consumption and high efficiency. A VPSA process was studied for the separation of a mixture of CO 2/N 2 (80% N 2 and 20% CO 2). Experiments were performed in an eight-step, four-bed setup using zeolite 13X and carbon molecular sieve (CMS) as adsorbents. Experimental measurements by the bench-scale system have been obtained in a pressure range of 2.7–4.7 bar, cycle times of 360–600 s, the product flow
Capsulated phase change materials (CPCM) is one of the most interesting and applicable high energy density solutions due to the store of thermal energy, though there has been little investigations for such systems at high temperature (Jamekhorshid et al. in Renew Sustain Energy Rev 31:531–542, 2014 [1], Qian et al. in Energy Convers Manag 98:34–45, 2015 [2]). The aim of this work is to create a CPCM with high durability for high temperature applications. The capsulation can be made by physical or chemical methods (Qian et al. in Powder Technol 282:37–42, 2015 [3]). Phase change materials (PCMs) are substances which melt and solidify at a constant temperature and are capable of storing and releasing large amounts of e
Olefins production plants are large-scale processes in most of which gaseous and liquid hydrocarbons are cracked to produce light olefins. The complex and large-scale nature of these plants makes it an utmost necessity to design and operate them by using of computer-aided optimization and control methods. This review paper provides an overview of the reported research works on the optimization and control of different parts of olefin plants. The main research studies are discussed in to main sections of Optimal design, and Process operation and control. In the optimal design section, the state of the optimal design of cracking furnace systems, cold-end separation systems, and separation columns have been studied. Then in process operation a
Although the power conversion efficiency of perovskite solar cells (PSCs) reached up to 25% that made them comparable to the commercial solar cells, they are facing issues toward commercialization, especially their short lifetime. Remarkably, the most important key factors that regulate the durability of the devices are moisture, light, and heat. In this work, prolonging the device lifetime is focused by designing a flexible moisture-blocked and temperature-controlled encapsulation system. In this regard, a thermally adjusted phase change material is embedded in a polymer encapsulation layer to avoid the moisture diffusion, rapid temperature fluctuation, and undesired crystalline phase change of the perovskite layer in the PSCs under the op