Many people will be surprised, but this cheap reflective film has been working for about 2 month in wind, rain and snow. These are my experiments to create a solar heater which is 50 times cheaper than similar parabolic mirrors for the production of solar electricity. My cheap mirror is designed to convert solar energy into thermal energy for liquid with a temperature of about 300 ºC, which will produce electricity similar to these well-known solar power plants. We know that these power plants can generate solar electricity not only during the day, but also at night, thanks to a similar heat storage, and therefore they are better than solar panels which give us electricity only during the day.
The goals of my future solar heater are described by this formula which leads us to the cost of solar heat at the level of 0.5 / kWh, and it is approximately 10 times cheaper than the cost of heat from natural gas. In addition, this cheap thermal energy can be used to generate solar electricity which is cheaper than electricity from thermal and nuclear power plants.
The topic of this video is my measurements of the efficiency of this type of mirrors, which is a combination of this cheap mesh, and this reflective film at a price of 25 cent / sq.m. I will analyze the features of this spot of solar radiation from my cheap mirror, and I will show the results of my measurements of its thermal capacity.
But I am also doing other work to create my cheap solar heater, and for example, now we see the initial stages of my experiments on creating a motion system for this receiver. Therefore, let's look at how this spot of solar radiation from my mirror moves due to the movement of the sun across the sky from morning to evening, when the west-east line is here. Now it is morning, and we pay attention to this screen, and here we see that spot of radiation from my mirrors. Time points of one day on the 23 of December are shown here. We see that my mirror is absolutely motionless, but the screen must move, and now I will show the same, but more slowly. We understand that this screen simulates this receiver for heating liquid up to 300 ºC by this spot of solar radiation.
I plan to finish testing this receiver motion system in about 6 months, and then I will describe it in more detail. Of course, this is just one of the system options in a large variety of motion systems of receiver or mirrors. That is why I plan to study other system options as well, and I will describe them in my future videos. Now I remind you that the traditional widely known option is this movement of the mirror together with the receiver.
In addition, the test of the lifespan of my cheap reflective film continues, and I will describe its results in my future videos, after a few months. I have experience with similar tests, and therefore I think that the lifespan of this reflective film will be approximately 12 months. But this film is very cheap, and its replacement is easy, and the annual costs of its replacement will be consistent with these operating costs.
However, let's analyze the efficiency of my mirrors, because the efficiency affects this value in the formula of the cost of our solar heat. Unfortunately, my experiments have found several unpleasant surprises.
Let's analyze why this spot has a large height in this vertical direction. Now I have covered this peripheral part of the mirror so that we can see the phenomenon of large spot height better. Now this open height of the mirror is even less, and our unpleasant phenomenon is visible more clearly. This is the next step, when only these 4 central cells are open and form such spot. Then we come to this stage of our experiment, and this single cell of our mirror will now show us its spot. Now we will see this spot from the single cell in a different way, and the spot is located here.
Let's pay attention to the width of the spot in this direction. We understand that now the spot is at the focal point, and further its width increases.
At the same time, let's look at the height of the spot in this direction. This height of the mirror cell is 15 cm, but the height of the spot is larger, and for example, now this height is about 20 cm, and now the spot height has increased to 25 cm.
That is why we can conclude that the film surface is convex in the vertical direction, and this phenomenon will prevent our mirror from focusing solar radiation well. The convexity of our film is clearly visible now if we pay attention to these reflections of vertical wires or to these gaps between the wires and the reflective film.
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