What is parabolic trough system?
Parabolic trough is a set of concave mirrors that concentrate solar rays on the receiver tube that is located in the focus. These troughs can track the Sun around one axis, typically oriented north–south to ensure the highest possible efficiency.
What is rim angle in parabolic trough collector?
A cross-section of a parabolic trough collector is shown in Figure 3.37, where various important factors are shown. The incident radiation on the reflector at the rim of the collector (where the mirror radius, rr, is maximum) makes an angle, φr, with the center line of the collector, which is called the rim angle.
Which focusing is used in parabolic trough collector?
2.1 Parabolic trough collector. PTC systems use the mirrored surface of a linear parabolic reflector to focus direct solar radiation onto an absorber pipe that runs along the focal line of the concentrator and contains a working fluid that is generally used to produce steam that drives a steam turbine.
What is a parabolic trough made of?
The parabolic trough reflector when used as a solar thermal energy collector is constructed as a long parabolic reflecting mirror which is usually painted a reflective silver, or made from polished aluminium, or uses mirrors which extends linearly into the trough shape.
What is parabolic collection?
A parabolic trough is a type of solar thermal collector that is straight in one dimension and curved as a parabola in the other two, lined with a polished metal mirror.
Does the rim angle depend on the aperture width?
For a given aperture width, the focal length will set the rim angle. Optical performance will depend on the distance between the reflecting surface and the absorber for a given slope error.
What is parabolic trough reflector?
The parabolic trough reflector is a solar thermal energy collector designed to capture the sun’s direct solar radiation over a large surface area and focus, or more generally “concentrate it” onto a small focal point area increasing the solar energy received by more than a factor of two which means more overall heat …
How much energy does parabolic trough produce?
The parabolic solar trough operates at about 75% efficiency, and at 495 square foot can collect approximately 270 kWh / 10 hours on a clear day. This solar energy can be used to do work such as to heat water to higher temperatures of 212°F (100° C), killing all bacteria in the water making the water safe to drink.
What is the concentration ratio of parabolic dish solar collector?
Schematic of a parabolic-dish solar concentrator [57]. These collectors consist of a set of parabolic dish–shaped mirrors. The operating temperature of the systems is over 1800K while the concentration ratio typically is in the range between 1000 and 5000K.
What is a parabolic trough?
A parabolic trough is a type of solar thermal collector that is straight in one dimension and curved as a parabola in the other two, lined with a polished metal mirror. The sunlight which enters the mirror parallel to its plane of symmetry is focused along the focal line, where objects are positioned that are intended to be heated.
What is the efficiency of a parabolic solar trough?
The parabolic solar trough operates at about 75% efficiency, and at 495 square foot can collect approximately 270 kWh / 10 hours on a clear day.
What is the difference between parabolic trough and linear Fresnel system?
Similar to a parabolic trough is a linear Fresnel system. These collectors resemble parabolic troughs but use long flat Fresnel mirrors. This technology is much cheaper to install but has lower efficiency. Examples are limited to a few plants.
What is the operating temperature of parabolic-trough collector?
The operating temperature of the system is in the range of 500–700K and the geometric concentration ratio of the parabolic-trough system is in the range of 30–100 ( Table 8.3) [57]. Parabolic-trough collector is a viable technology for harnessing solar energy for industrial process heat in Cyprus [58].