Explain classification of heat conversion devices. Also, elaborate the advantages and disadvantages of concentrating and non-concentrating solar thermal devices.

Classification of Heat Conversion Devices:

Heat conversion devices can be classified into two main categories: concentrating and non-concentrating solar thermal devices.

1. Concentrating Solar Thermal Devices:

Concentrating solar thermal devices utilize mirrors or lenses to focus sunlight onto a smaller area, thereby increasing the intensity of solar radiation. This concentrated sunlight is then used to heat a fluid, which in turn generates steam to drive a turbine and produce electricity, or to directly heat a material for industrial processes or space heating. Concentrating solar thermal devices can be further classified into several types:

- Parabolic Trough Systems: These systems use curved, reflective troughs to concentrate sunlight onto a receiver tube placed along the focal line of the trough. The concentrated sunlight heats a heat transfer fluid (such as oil or molten salt) flowing through the receiver, which is then used to generate steam and produce electricity.

- Parabolic Dish Systems: These systems use a parabolic dish-shaped reflector to focus sunlight onto a single focal point at the receiver located at the dish's center. The concentrated sunlight heats a fluid, usually a gas, within the receiver to produce electricity via a Stirling engine or a Brayton cycle engine.

- Solar Power Towers: Solar power towers consist of a field of sun-tracking mirrors (heliostats) that reflect sunlight onto a central _________ ______ ____ ___ _________ ____ _____ _________ _____ ______ ________ ________.
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