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- 저자 : Dehaj Mohammad Shafiey (검색결과 3 건)
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Mohammad Shafiey Dehaj,Hassan Hajabdollahi,Mohammad Ataeizadeh 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.10
This paper reports an investigation into the effects of different nanoparticles, including copper oxide, zirconium oxide, aluminum oxide, and silicon oxide nanoparticles, on thermoeconomic optimization of the gasket plate heat exchanger (GPHE). Effectiveness and total annual cost (TAC) were selected as two objective functions simultaneously. The non-dominated sorting genetic algorithm (NSGA-II) with seven design variables involving particle volumetric concentration and geometrical parameters of the GPHE was used for optimization. Results showed that TAC versus effectiveness was improved when nanoparticles were applied. The results of the optimization show that heat exchanger thermoeconomic parameters are better improved in the case of copper oxide as nanoparticles and generally followed by zirconium oxide, aluminiom oxide, silicon oxide. For example, 2.61% growth in the effectiveness and 6.8% reduction in the TAC are observed in the case of copper oxide nanoparticles compared with the case of without nanoparticles. The effectiveness and TAC decreased with an increase in the corrugation wavelength, while an enhancing in the plate length of the GPHE leads to an increase in effectiveness and TAC. Also, the results indicate that with an enhancement of the particle volumetric concentration of nanoparticles, effectiveness and TAC were increased linearly. Finally, the effect of the price of different nanoparticles on TAC was studied.
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Behrad Haghghi,Amin Saleh,Hassan Hajabdollahi,Mohammad Shafiey Dehaj 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
A cogeneration production system of power and freshwater was studied from the perspective of energy,exergy, economic, and environmental (4E). The main components of this system include a Brayton cycle (BC), dual-pressureheat recovery steam generator (HRSG), steam turbine (ST), and multi-effect evaporation with thermal vapor compression(MEE-TVC). The system was optimized with a multi-objective genetic algorithm using MATLAB software andby considering the performance of two objective functions: the total annual cost (TAC) to minimize and the thermal efficiencyto maximize. The results showed that, with increasing gas turbine inlet temperature, thermal efficiency, exergy efficiency,and emission of pollutants improved, but the gain output ratio (GOR) decreased. GOR of desalination system,exergy efficiency of combined cycle power plant (CCPP), and emission of pollutants improved by increasing the compressorpressure ratio. In investigating the number of effects in desalination unit, by increasing this parameter the productionof freshwater, GOR and exergy efficiency of MEE-TVC was increased. By adding a duct burner to the cogeneration system,the thermal efficiency, the exergy efficiency, and the net power output were reduced by 0.67, 3.9, and 5.91%, respectively. But the freshwater production, GOR, and TAC was improved about 7.97, 9.69, and 1.265%, respectively.
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Solghar Alireza Arab,Ahsaei Seyed Hossein,Iranmanesh Afshin,Dehaj Mohammad Shafiey 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.8
Embedment of phase change materials (PCMs) in buildings elements is a technique to lower the heating and cooling demands. In the present study, a frame of entrance doors filled with the PCMs was simulated for a sunny summer day condition of Rafsanjan city in Iran. It was assumed that the frame is subjected to the indoor and outdoor temperature and solar radiation. The simulation was carried out through 2-D finite element method taking into account heat and mass transfer in the PCM. A parametric study was conducted to investigate the type of PCMs, the volume PCMs as well as their positions in the frame. The results were compared with a common frame filled with air. The obtained findings showed that RT-25 is more effective than capric acid, paraffin and P116. Maximum reduction of heat flux was observed to be 37.72% for the frame filled with RT-25 when its outside walls were in contact with the PCM. The results also reveal that the incorporation of the PCM is effective for passive thermal storage.
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