Полезное:
Как сделать разговор полезным и приятным
Как сделать объемную звезду своими руками
Как сделать то, что делать не хочется?
Как сделать погремушку
Как сделать так чтобы женщины сами знакомились с вами
Как сделать идею коммерческой
Как сделать хорошую растяжку ног?
Как сделать наш разум здоровым?
Как сделать, чтобы люди обманывали меньше
Вопрос 4. Как сделать так, чтобы вас уважали и ценили?
Как сделать лучше себе и другим людям
Как сделать свидание интересным?
Категории:
АрхитектураАстрономияБиологияГеографияГеологияИнформатикаИскусствоИсторияКулинарияКультураМаркетингМатематикаМедицинаМенеджментОхрана трудаПравоПроизводствоПсихологияРелигияСоциологияСпортТехникаФизикаФилософияХимияЭкологияЭкономикаЭлектроника
Power from the Sun
|
|
All energy on the earth is the transformed heat of the sun. For many centuries man has used this transformed solar heat in the form of wood, coal and oil or natural gas, and in a million other ways. But, though natural fuel supplies are great, they wШ come to an end. So today we must ask: "Where else can we find fuel?"
Is it possible to use directly the energy of the sun? The answer to this question is simple:"Yes, it is!"
We now use power from the sun to dry fruits and vegetables. It can also be used to heat and boil water and even to get steam for small factories. It can be used in homes, hothouses and solar refrigerators.
It is very simple to make a solar water -heater.
Blacken the bottom and sides of a box, coat it with heat-insulating material and cover it with a piece of glass. Then stand it out1 in the sun. You will find that the temperature inside the box begins to rise rapidly even if it isn't a very hot day. The bottom of the box, blackened, transforms the light of the sun into heat, while the glass cover stops the heat from escaping.
This simple "hot-box" method has long been used in making solar hotbeds and hothouses.
The temperature inside the box will go up much more quickly and will go much higher, if the top is covered not with one but with several sheets of glass. A hot-box with a temperature of 437° F2 inside it - that is3, two and a quarter times the temperature of boiling water has been built. The box has eight sheets of glass.
Another solar boiler is a box about 16 feet long, seven feet wide and some seven inches high. On a sunny day, it can heat 150 gallons of water to a temperature of about 140° F. The top of the box has two sheets of glass, with a third sheet on the bottom. Inside the box are fourteen rows of half inch iron pipes, with lengths4 of rubber tubing connecting them.
From one side the heater takes in5 cold water. From the other the hot water runs out. The whole process is automatic. This boiler has become very popular.
Date: 2015-12-13; view: 402; Нарушение авторских прав