محمد حسين علي سماع

This study developed a new method for experimentally measuring and estimating multilayer soil thermo-physical properties. It also tested how multi-layered soil influences an earth-air heat exchanger (EAHE) system in Gödöllő, Hungary. Thus, this research has introduced these combination characteristics that increase EAHE system performance by properly estimating soil multi-layer properties and thermal gradients and their thermal performance effects. New laboratory and theoretical methods can evaluate multilayer soil thermal and physical properties depending on moisture content and density. The first layer had the lowest soil moisture content (6.10 %), the fifth layer had the highest (12.8 %), and the mixed layer had the middle value (9.12 %). The densities of these soil types ranged from 930.49 to 1184.03 kg/m3. When installing the EAHE system, the second layer is better for cooling purposes. Third-layer soil pipe air is 3.74 % hotter than second-layer air. Mixed soil heats and cools moderately. It is 1.74 % hotter and 2 % colder than the second and third layers of soil, respectively.

This study presents a MATLAB/Simulink model to predict the distribution of soil temperatures and design Earth-to-Air Heat Exchangers (EAHEs) efficiently. It compares four EAHE configurations, including single-pipe, multi-pipe, multiple-single pipes (MS-pipes), and twisted-single pipes (TS-pipes) systems. The presented model is validated with reliable results and allows for easy modifications to obtain the final design. Results show that MS-pipe EAHE is the better in terms of pressure losses and good in terms cooling potential. The study proves that the installation of the EAHEs in Kufa, Iraq, is highly efficient, achieving cooling potential of 1626 W in August and 129.8 W in March. Additionally, the study highlights the influence of the geometric configuration of EAHEs on both their flow behavior and thermal efficiency, presenting an equation for comparing pipe lengths at different soil depths. This study fills the knowledge gap in the use of MATLAB simulation for designing EAHEs and estimating soil temperatures distribution and it compares four EAHEs configurations.

This paper presents a MATLAB/Simulink model to design and assess Solar Chimney Power Plants (SCPPs) in any location worldwide, offering a simple and efficient approach that saves time and costs, while maintaining the flexibility of the design process. The model evaluates the physical and engineering specifications, pressure loss, power production, and characteristics of SCPPs. The model is applied to evaluate an SCPP in Kufa, Iraq, where no previous study has been conducted to evaluate such renewable energy sources. The proposed model's reliability is demonstrated by comparing the results to those from previous literature. The study concludes that the SCPP's power production built with a glazed roof radius of 50 m, a chimney radius of 5 m, a roof height of 2 m, and the chimney height of 50 m was highest during the summer months due to high solar radiation and temperatures, with the highest average production occurring in July at 537.87 kW, 12% greater than the least productive month of January. The SCPP's annual average power production is 6,122.3 kW, indicating high efficiency for renewable energy in these regions. The study also found that ambient temperature has a greater impact on energy production than solar radiation within a certain range. Otherwise, solar radiation has the greatest impact. The paper highlights the significance of temperature in regions such as Kufa, where the temperature can reach as high as 42.3 °C, and the impact of temperature and radiation on power production. This study provides a reliable model that can aid in designing and evaluating SCPPs in various locations.

دورة تدريبية في استخدامات الطاقة الشمسية تستهدف المهندسين و الفنيين

دورة تدريبية في استخدامات الطاقة الشمسية تستهدف المهندسين و الفنيين