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Technical Brief

Evaluation of Impact of Shading Devices on Energy Consumption of Buildings in Tropical Regions

[+] Author and Article Information
Akash Samanta, Jhumoor Biswas

Indian Institute of Social Welfare
and Business Management,
Kolkata 700073, India

Saibal Saha

Usha Martin Limited,
Kolkata 700071, India

Arindam Dutta

Indian Institute of Social Welfare
and Business Management,
Kolkata 700073, India
e-mail: arindamdutta190@hotmail.com

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 20, 2013; final manuscript received March 3, 2014; published online April 9, 2014. Assoc. Editor: Kau-Fui Wong.

J. Energy Resour. Technol 136(2), 024503 (Apr 09, 2014) (6 pages) Paper No: JERT-13-1246; doi: 10.1115/1.4027154 History: Received August 20, 2013; Revised March 03, 2014

The aim of this paper is to demonstrate the role of shading devices in the improvement of energy efficiency of buildings in hot dusty and dry tropical regions. The effect of shading in reducing the energy consumption of buildings is investigated by considering a case study of a guest house chosen because of its logical design approach to reduce thermal loads. The building plan, measurements, and details on schedules of building usage activities have been used as input data to a simulation program of the building. Based on the inputs, a thermal building model is developed in trnsys 17 simulation program and the effect of external shading on the building has been explored. It is seen that building design and orientation determine the effectiveness of shading. Movable shading over windows has a significant impact reducing temperatures by about 1.5 °C in each thermal zone. The difference in thermal energy loads of the building calculated from modeling simulations of the base case and the control case utilizing movable shading devices is approximately 8%. A programmable logic controllers (PLC)-based movable shading device has been designed to facilitate optimal shading control. The results enable us to draw inferences regarding the additional contribution of the shading factor in energy saving techniques for buildings.

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Figures

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Fig. 1

The 3D building developed using Google Sketchup and the actual geometric layout of ECL guest house

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Fig. 2

trnsys Simulation Studio model components and connections

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Fig. 3

Shading schedule used in the PLC automated movable shading device

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Fig. 4

The PLC automated movable shading device and its position in the building

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Fig. 5

PLC ladder logic for automatic movable window shading device

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