Lecture 6A - Solar Thermal - Part 1

Lecture 6A - Solar Thermal - Part 1 - ECE 4364/5374G...

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2/17/11 1 ECE 4364/5374G-6A (c) Saifur Rahman 1 Professor Saifur Rahman Electrical & Computer Engineering Dept. Virginia Tech ECE 4364/5374G: Alternate Energy Systems Lecture 6A: Solar Thermal - 1 ECE 4364/5374G-6A (c) Saifur Rahman 2 Solar Thermal systems convert sunlight into heat for various forms of end-use; space heating, water heating, industrial process steam, cooking, absorption cooling, crop drying, solar greenhouse, salt production by brine evaporation, desalination, and electricity production. There are many experimental and developmental solar energy utilization systems. Many of them started in late 70’s. Currently there is more focus on commercially viable technologies rather than exploring new concepts. In the United States and in many countries, solar water heating is a commercial technology and is widely available. Solar thermal electricity is still a prototype technology. Chapter 8 Solar Thermal Systems
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2/17/11 2 ECE 4364/5374G-6A (c) Saifur Rahman 3 Solar Thermal Electricity (Central Collector) Source: www.nrel.gov/data/pix ECE 4364/5374G-6A (c) Saifur Rahman 4 Solar Thermal Electricity (Linear Focus Collector) Source: www.nrel.gov/data/pix
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2/17/11 3 ECE 4364/5374G-6A (c) Saifur Rahman 5 Solar Thermal Electricity (Point Focus Collector) Source: www.nrel.gov/data/pix ECE 4364/5374G-6A (c) Saifur Rahman 6 The design and operation of a simple flat plate collector is discussed in the following. The efficiency of a collector depends upon its temperature; the higher the operating temperature of a collector the greater is the heat loss. On the other hand, higher operating temperature results in more efficient use of the collector fluid. The objective of the design is to minimize the heat loss from the collector while maintaining as high an operating temperature as possible. Theory of Collector Opera=on
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2/17/11 4 ECE 4364/5374G-6A (c) Saifur Rahman 7 Solar Collector ECE 4364/5374G-6A (c) Saifur Rahman 8 Source: www.nrel.gov/data/pix/searchpix_visual.html Solar Collector
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2/17/11 5 ECE 4364/5374G-6A (c) Saifur Rahman 9 Heat Loss Calcula=on The earth-atmosphere system absorbs a portion of the incident energy of the sun. In turn, this energy is radiated back into the space, creating an energy balance. Both the sun and objects on earth behave like black-body radiators, the power radiated from which is proportional to their surface temperature.
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