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Topics Tagged ‘Solar’

Solar Based Refrigerator

Added on: July 20th, 2023 by Webmaster No Comments

The solar-based refrigerator is an innovative and sustainable solution that harnesses the power of solar energy to provide cooling without relying on traditional electricity sources. This seminar presentation report explores the principles, working mechanisms, advantages, and applications of solar-based refrigerators. The report delves into the environmental benefits of such systems, including reduced carbon emissions and energy conservation. Furthermore, it highlights the potential for solar-based refrigerators to improve access to refrigeration in remote areas and off-grid regions.

In recent years, the adverse effects of conventional refrigeration methods have become evident, prompting a shift towards more environmentally friendly alternatives. Conventional refrigeration systems, relying on electricity and synthetic refrigerants with high Global Warming Potential (GWP), contribute significantly to greenhouse gas emissions and ozone depletion. Moreover, their energy-intensive nature leads to substantial electricity consumption, resulting in rising energy costs and strained power grids.

In light of these challenges, solar-based refrigerators offer a beacon of hope for a sustainable future. The working principles of solar refrigeration are based on the well-established thermodynamic cycle, where solar energy is utilized to drive the cooling process. By using solar panels to capture sunlight, solar-based refrigerators can produce electricity or direct heat to power the refrigeration cycle, significantly reducing the reliance on conventional grid electricity and mitigating the environmental impact.

This report further delves into the technical aspects of solar-based refrigeration, exploring the components and system design considerations. Energy storage methods, such as batteries and phase change materials, are discussed to ensure continuous cooling during periods of limited sunlight. Additionally, the selection of appropriate cooling components, like evaporators and compressors, and effective insulation techniques are vital for optimizing the performance and efficiency of solar-based refrigeration systems.

The advantages of adopting solar-based refrigerators are multifaceted. Beyond the substantial environmental benefits, these systems offer reduced operating costs, making refrigeration more economically viable in the long run. Furthermore, the versatility and portability of solar-based refrigerators make them ideal for use in remote areas, off-grid communities, disaster relief scenarios, and mobile applications, where conventional cooling solutions may be impractical or inaccessible.

Real-world applications and case studies demonstrate the feasibility and success of solar-based refrigeration across various sectors. From providing essential healthcare services in remote clinics to supporting agriculture through cold storage for perishable produce, these case studies showcase the transformative potential of solar refrigeration in addressing pressing challenges faced by diverse communities.

The seminar presentation report also examines the environmental impact and sustainability of solar-based refrigerators. By substantially reducing greenhouse gas emissions and promoting energy conservation, these systems align closely with global efforts to combat climate change and achieve sustainable development goals. The report emphasizes the positive ecological footprint of solar refrigeration as a powerful tool for environmental preservation.

Despite the numerous advantages, challenges still exist in the widespread adoption of solar-based refrigeration. High initial costs, energy storage limitations, and climatic influences remain areas of concern. However, ongoing research and technological advancements are continuously improving the efficiency, affordability, and reliability of solar-based refrigeration, bolstering its potential to become a mainstream cooling solution in the future.

In conclusion, this seminar presentation report advocates for the adoption of solar-based refrigeration technology as a viable and sustainable alternative to conventional cooling systems. Embracing solar-based refrigerators can lead to a more equitable distribution of cooling solutions worldwide, improving the quality of life for underserved communities and contributing to a greener, more environmentally conscious global society.

Solar Sail

Added on: February 24th, 2020 by Webmaster No Comments

Hundreds of space missions have been launched since the last lunar mission, including several deep space probes that have been sent to the edges of our solar system. However, our journeys to space have been limited by the power of chemical rocket engines?and the amount of rocket fuel that a spacecraft can carry. Today, the weight of a space shuttle at launch is approximately 95 percent fuel. What could we accomplish if we could reduce our need for so much fuel and the tanks that hold it?
International space agencies and some private corporations have proposed many methods of transportation that would allow us to go farther, but a manned space mission has yet to go beyond the moon. The most realistic of these space transportation options calls for the elimination of both rocket fuel and rocket engines — replacing them with sails. Yes, that’s right, sails.
Solar-sail mission analysis and design is currently performed assuming constant optical and mechanical properties of the thin metalized polymer films that are projected for solar sails. More realistically, however, these properties are likely to be affected by the damaging effects of the space environment. The standard solar-sail force models can therefore not be used to investigate the consequences of these effects on mission performance. The aim of this paper is to propose a new parametric model for describing the sail film’s optical degradation with time. In particular, the sail film’s optical coefficients are assumed to depend on its environmental history, that is, the radiation dose. Using the proposed model, the optimal control laws for degrading solar sails are derived using an indirect method and the effects of different degradation behaviors are investigated for an example interplanetary mission.

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