Solar Thermal Engineering
Fatemeh - Ahani; Elham - Sarkardehi; Maryam - Ansarimanesh; Hamed - Moslehi
Abstract
Approximately 40% of fossil energy consumption in Iran is attributed to office and residential buildings. Therefore, optimizing energy consumption and managing energy demand in these buildings is essential. A key aspect of this optimization is the building's outer shell, which plays a vital role ...
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Approximately 40% of fossil energy consumption in Iran is attributed to office and residential buildings. Therefore, optimizing energy consumption and managing energy demand in these buildings is essential. A key aspect of this optimization is the building's outer shell, which plays a vital role in heat control. One effective method for reducing energy consumption in buildings is the implementation of double-skin facades (DSFs), which have demonstrated superior performance compared to single-skin facades. Considering the high energy consumption of office buildings in Iran, this research aimed to minimize energy use in the computer center building at Shahrood University of Technology. The research methodology consisted of a literature review, field measurements, and simulation. The validity of the research data was evaluated against field measurements, and its accuracy was confirmed. Using Design Builder version 7 simulation software, twelve models of double-skin facades were analyzed and categorized into box window facades and shaft boxes, both located on the southern elevation of the computer center building. The results indicate that the double-skin facade featuring a box window reduces the building's energy consumption by 6.4% to 9.7% compared to the single-skin facade. Additionally, the double-skin facade of the shaft box also decreases energy consumption, ranging from 5.5% to 9.3% compared to the single-skin facade.
Desalinations Systems with Renewable Energies
Neda Mehtari; Mostafa Kahani; Mohammad Zamen
Abstract
The current research focuses on the utilization of three waste water streams from a power plant located in southwestern Iran for desalination purposes and to prevent the waste of heat from the boiler blowdown stream while reducing carbon dioxide emissions by preheating the cooling water. Three different ...
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The current research focuses on the utilization of three waste water streams from a power plant located in southwestern Iran for desalination purposes and to prevent the waste of heat from the boiler blowdown stream while reducing carbon dioxide emissions by preheating the cooling water. Three different scenarios are simulated using the Thermoflow-GT master 23 software, considering the conditions of power plant. The optimal values for the top brine temperature (TBT) of cooling water and the mass flow rate of the hot steam are selected by sensitivity analysis. The premier scenario consists of eight stages, with five stages dedicated to heat recovery (HGS) and three stages for heat rejection section (HRS). The optimal value for the TBT of cooling water is determined to be 90℃, the produced freshwater capacity in the desalination unit is found to be 1.69 kg/s, and the gain output ratio (GOR) of the system is about 3.60. The proposed unit requires 0.47 and 10.15 kg/s of hot steam and cooling water, respectively and the overall heat transfer coefficient is 2069.2 W/m2 ℃. In addition, the feasibility of utilizing a solar farm to generate the necessary thermal energy for the system is being evaluated.
R. Alayi; F. Jahanbin
Abstract
The purpose of this research is to supply the electricity required by renewable energies used by the photovoltaic cell, in this regard, have been using the type of crystal silicon photovoltaic cells. The used software with this regard is Homer. Homer is capable of simulating renewable energies to monitor ...
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The purpose of this research is to supply the electricity required by renewable energies used by the photovoltaic cell, in this regard, have been using the type of crystal silicon photovoltaic cells. The used software with this regard is Homer. Homer is capable of simulating renewable energies to monitor demand for loads. Electricity is generated by the Pv cell, but the energy produced in DC. While the energy required is alternating after the voltage converter is used for conversion. The storage will be used at times when there is no electricity produced by the PV cell or the production of electricity is higher than the demand, in this study the battery is considered a storage unit. The important results of this study can be attributed to the production of 15339 kW electricity by the Pv cell.