Design and Operation of Sustainable Systems

Design and Operation of Sustainable Systems 1
Design and Operation of Sustainable Systems
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Design and Operation of Sustainable Systems 2
1. Introduction
A heliostat is a device that consolidates a mirror, as a rule a plane mirror,
which swings to keep reflecting light toward a destined target, compensating for the
sun's reasonable developments in the sky. The objective may be a physical pinnacle,
distant from the heliostat, or an area in space. To do this, the keen surface of the
mirror is held inverse to the bisector of the edge between the headings of the sun and
the objective as saw from the mirror. In basically every case, the objective is
stationary concerning the heliostat, so the light is reflect in a fixed manner. Most
present-day heliostats are obliged by PCs (Viswanathan 2015). The PC is given the
extension and longitude of the heliostat's circumstance on the earth and the time and
date. From these, using galactic theory, it figures the heading of the sun as saw from
the mirror. Its compass bearing and purpose of rising. By then, guided the objective,
the PC registers the course of the required edge bisector, and sends control signs to
motors, routinely stepper motors, so they turn the mirror to the correct position. This
arrangement of activities is rehashed every now and again to keep the mirror
legitimately situated. Heliostat field or sunlight based pinnacle gatherer is a standout
amongst the most encouraging concentrated sun based power advances accessible in
the market. Because of its high working temperature, heliostat field collector can be
actualized in a wide scope of uses from sun-powered power age to mechanical
commodity creation. There are a few as of now working, under development, and
arranged heliostat fields the world over. One of them is in Odeillo, France, and
another one is PS10 in Spain
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Figure 1: Odeillo and PS10, respectively, Source: Viswanathan 2015
2. Bearing Diameter Selection
The requirements for this case is that the bearing to be designed would to be
operational for 25 years and hence, the size should be adjusted to meet this
compromise. The bearing will be of the type, dry. Its diagram is as shown below.
Figure 2: Dry or partially Lubricated, Source: Lecture Slides
There is also a need to reduce maintenance costs. Under common parlance,
the ratio of length to diameter of journal bearings is 1-2 (Khonsari & Booser, 2017).
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Figure 3: Design Values for Journal Bearing, Source Khonsari & Booser, 2017)
Design includes the utilization of the dimensionless number. The Sommerfeld Number
(Khonsari & Booser, 2017).
This number, S = 14.3 ×106
P = W/ld
From table c/d = 1/1000. Therefore d/c = 1000
Since the sun rotates from East to West once a day, we assume that N to be 10 rpm.
Weight = 300 × 9.81 = 2943 N
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