Building Energy Use: Modeling and Analysis of Lighting Systems-A Case Study

Article Construction & Building Technology

LED there be light: The impact of replacing lights at schools in South Africa

M. J. Booysen et al.

Summary: South Africa's private sector has been implementing energy-saving mechanisms, while the public sector faces misplaced incentives hindering the adoption of energy-efficient technology. With falling LED lighting costs and rising electricity prices, the conversion is becoming more cost-effective. The education sector is a promising test case, where savings from utilities can enhance value-adding services in schools, although the cost-benefit of replacements and decision-making options may present challenges.

ENERGY AND BUILDINGS (2021)

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Article Green & Sustainable Science & Technology

Energy Retrofit. A Case Study-Santi Romano Dormitory on the Palermo University

Domenico Curto et al.

Summary: Today, there is a significant focus on the electrical and thermal consumption related to buildings, requiring energy retrofits to achieve energy savings goals. Detailed analysis of each building's specific requirements, load profiles, and facility needs is essential for effective improvement. A case study by the Department of Engineering at Palermo University demonstrated that significant energy savings can be achieved through measures such as replacing generation systems, installing co-generators, replacing windows, and switching to LED lighting.

SUSTAINABILITY (2021)

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Article Thermodynamics

A three-dimensional thermal analysis for cooling a square Light Emitting Diode by Multiwalled Carbon Nanotube-nanofluid-filled in a rectangular microchannel

Mohamed Bechir Ben Hamida et al.

Summary: This paper investigates the thermal management of LED and the use of different nanofluids in the cooling system. The study found that using MWCNT-Water in the microchannel is the most effective way to cool the heat sink and reduce the junction temperature of the LED lamp.

ADVANCES IN MECHANICAL ENGINEERING (2021)

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Article Thermodynamics

A three-dimensional thermal management study for cooling a square Light Edding Diode

Mohamed Bechir Ben Hamida et al.

Summary: This study uses a three-dimensional, time-dependent code to simulate the thermal management of square LED lamps and finds that drilling holes in the heat sink can reduce the junction temperature of the LED lamp. The role of the convection heat transfer coefficient is crucial in ensuring good heat dissipation and cooling of the lamp by increasing the internal exchange surface.

CASE STUDIES IN THERMAL ENGINEERING (2021)

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Article Multidisciplinary Sciences

Optimization of fins arrangements for the square light emitting diode (LED) cooling through nanofluid-filled microchannel

Mohamed Bechir Ben Hamida et al.

Summary: In this study, a finned micro-channel design for LED cooling was optimized using a nanofluid and geometry variables to enhance heat transfer efficiency. The results showed that the length of the fin had the most significant impact on the Nusselt number, with Al2O3 nanoparticles at phi=0.05 providing the greatest heat transfer value. Different fin arrangements increased nanofluid temperature by up to 6.5%, improving the LED cooling process.

SCIENTIFIC REPORTS (2021)

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Article Thermodynamics

A three-dimensional thermal analysis and optimization of square light edding diode subcomponents

Mohamed Bechir Ben Hamida et al.

Summary: This paper aims to assess thermal management and optimize parameters of a single-chip LED in order to maximize light output and device reliability. A 3D numerical code is developed to solve equations for mass, momentum, and energy, and different materials for various subcomponents are studied to reduce junction temperature.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2021)

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Article Green & Sustainable Science & Technology