http://yetl.yabesh.ir/yetl1/handle/yetl/19043 2026-08-25T13:35:17Z 2026-08-25T13:35:17Z Panda, Swapna Rekha Asthana, Sudeep Kanawade, Ravindra Kumar, Vivek Behera, Sushanta Kumar Kumar, Amit http://yetl.yabesh.ir/yetl1/handle/yetl/4316900 2026-08-23T08:41:24Z 2026-01-01T00:00:00Z

Solar-Powered Waste Compactor for Sustainable Environmental Application Panda, Swapna Rekha; Asthana, Sudeep; Kanawade, Ravindra; Kumar, Vivek; Behera, Sushanta Kumar; Kumar, Amit Abstract. This study presents the design, development, and field evaluation of a compact solar-powered waste compactor aimed at improving municipal solid-waste (MSW) collection efficiency. The system uses 9-V rechargeable batteries charged via a 6-V solar panel mounted on the bin lid. An embedded sensor triggers automatic compaction upon each waste deposit, supplemented by manual control. A fill-level monitoring circuit with light-emitting display indicators and a buzzer signal when capacity is reached. The compaction mechanism increases effective bin capacity by over four times compared to nominal volume, thereby extending collection intervals. A 64-day field trial in New Delhi compared four solar compactors (0.013 m3) with four conventional bins (0.015 m3). Conventional bins required 80 collection trips at a cost of ₹5220.80, whereas solar compactors required only 16 trips costing ₹1044.16. This represents an 80% reduction in transport expenses and an average saving of ₹261.04 per bin per cycle. Projected over one year, a single solar compactor could save approximately ₹47,000 in collection costs, excluding labor and vehicle wear. Considering these savings, the system offers a potential payback period of less than eight years, which can be further reduced with bulk municipal deployment and indirect benefits such as lower greenhouse gas emissions. The Operational advantages included reduced waste spillage, odor suppression, and emission reductions of up to 70–80% due to the enclosed automated design. The results confirm that solar-powered compactors offer a robust, eco-friendly, and economically viable alternative for sustainable urban waste management.

2026-01-01T00:00:00Z Ngu, Jia You Jayamani, Elammaran Lee, Ted Sian Soon, Kok Heng http://yetl.yabesh.ir/yetl1/handle/yetl/4316804 2026-08-23T08:36:41Z 2026-01-01T00:00:00Z

Enhancing Solar Panel Efficiency Using Parallel Perforated Fin-Based Passive Cooling: A Simulation Study Ngu, Jia You; Jayamani, Elammaran; Lee, Ted Sian; Soon, Kok Heng Abstract. The reliance on solar photovoltaic (PV) systems demands effective thermal management to mitigate efficiency losses caused by elevated module temperatures. Previous research investigated solid parallel fins, yet limited studies have explored perforated parallel fins. Hence, this study investigates the performance of perforated parallel fins as a passive cooling solution for monocrystalline solar panels, aiming to enhance heat dissipation through improved thermal convection by mitigating stagnation zones. A 36-cell PV module, with and without fins, was modeled in solidworks and underwent fluid flow analysis using the Flow Simulation library. Five variations of perforated fins were explored, differing in perforation diameter, count, and geometry, and compared with solid fins. Additionally, fin materials (aluminum, copper, and stainless steel) were evaluated to determine their influence on thermal performance. Simulation results were validated using a theoretical matlab model and empirical field data. Findings reveal that 10 mm diameter circular perforated fins in a 9 × 10 array achieved the lowest average module temperature of 50.79 °C corresponding to a −9.80% power efficiency loss, significantly outperforming solid fins (56.42 °C and −11.94% loss). Copper fins demonstrated superior thermal performance, but aluminum offered an optimal balance of conductivity, weight, and cost. Circular perforations cooled the cells by 1.59 °C and 2.13 °C more than square and triangular perforations, respectively. In conclusion, the results affirm perforated fins as an effective and sustainable passive cooling enhancement for PV systems, as aluminum perforated parallel fins cooled PV modules by 24.61 °C and 5.63 °C more than bare and solid parallel finned solar panels.

2026-01-01T00:00:00Z Padamurthy, Ankammarao Nandanavanam, Jalaiah Meduri, Sitaram Enaganti, Prasanth Kumar http://yetl.yabesh.ir/yetl1/handle/yetl/4316799 2026-08-23T08:36:23Z 2026-01-01T00:00:00Z

Experimental Evaluation of Zeolite 5A for Low-Temperature Thermochemical Energy Storage Padamurthy, Ankammarao; Nandanavanam, Jalaiah; Meduri, Sitaram; Enaganti, Prasanth Kumar Abstract. Zeolites are suitable for thermochemical energy storage (TCES) because of their high energy density, thermal stability, and rapid reaction kinetics. However, these zeolites exhibit high regeneration/desorption temperatures. The present study was aimed at examining the thermal stability and energy storage density of zeolite 5A using an open sorption system. The energy storage and recovery characteristics of zeolite 5A were studied through successive desorption and adsorption for ten cycles. Further, the performance parameters were investigated to determine whether the system is suitable for the intended applications. The charge and discharge operations were performed at approximately 90 °C and 35 °C. The stored energy density during the desorption and adsorption was varied from 106.14 kWh/m3 to 119.53 kWh/m3, and 21.87 kWh/m3 to 27.99 kWh/m3, respectively. The change in mass caused by the multi-cycle test run was minimal for zeolite 5A. This makes it suitable for long-term energy storage without compromising its thermal stability. The current work has shown technological proficiency in applying energy sources including solar energy and industrial waste heat for low-temperature energy needs like water heating and building space heating.

2026-01-01T00:00:00Z Mozafarifard, Milad http://yetl.yabesh.ir/yetl1/handle/yetl/4316791 2026-08-23T08:36:08Z 2026-01-01T00:00:00Z

Effect of Geometric/Operating Parameters on Thermal Performance of a Flat-Plate Solar Collector Mozafarifard, Milad Abstract. This work presents a parametric investigation of steady-state two-dimensional heat transfer in the absorbing plate of a flat-plate solar collector. The effects of key parameters, including absorbing plate material, mass flowrate, solar irradiation, absorbing plate thickness, and number of glass covers on the temperature profiles of the absorbing plate and the working fluid are analyzed in detail. A point-to-point Gauss–Seidel iterative algorithm is employed to solve the governing heat conduction equation, incorporating insulated and convective boundary conditions. The results reveal that the use of high thermal conductivity and low emissivity materials such as copper increases the collector efficiency approximately up to 26% compared to conventional materials. Increasing the absorbing plate thickness from δp=0.1mmto10mm leads to an increase of approximately 24% in the collector efficiency. Similarly, reducing the mass flowrate from m˙=0.01kg/sto0.0001kg/s results in a higher efficiency, with an increase of about 25%, while the addition of glass covers significantly reduces thermal losses, increasing the collector efficiency slightly by 6%. Overall, the study demonstrates that an optimal combination of high thermal conductivity and low emissivity materials, thicker absorbing plates, lower mass flowrates, and multiple glass covers can substantially enhance the thermal performance of flat-plate solar collectors. These findings provide practical design guidelines for improving collector performance under various operating conditions.

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