“…… This is one of the types of solar water heaters, called 'vacuum tube solar water heaters'. Huang Shi turned around and patted the large round bucket of the solar water heater and said to the people gathered around.

If solar water heaters are divided according to the structural form, they can generally be divided into vacuum tube solar water heaters and flat panel solar water heaters.

The vacuum tube household solar water heater is composed of a collector tube, a water storage tank and a bracket and other related accessories, and the conversion of solar energy into heat energy mainly relies on the collector tube, which uses the principle of floating and cold water sinking on the hot water, so that the water produces microcirculation to achieve the required hot water.

The flat panel solar water heater is composed of a collector, a copper connector, a water tank, an auxiliary water tank, a bracket circulation pipe, a control system, a fully automatic auxiliary heating device, etc., while the collector and the water tank are separated from each other, and the collector can be flexibly installed on the roof, skylight, balcony or wall, not limited by location.

It stands to reason that the flat plate water heater is more advanced than the real tube water heater and should be more popular, because its collector can be installed on the balcony or exterior wall, without affecting the architectural design, and the energy efficiency is far better than that of the vacuum tube, its thermal efficiency can reach more than 52%, which is about 5% higher than the thermal efficiency of the vacuum tube, which is more efficient and energy-saving.

But in fact, on the contrary, whether it is a well-known domestic manufacturer or a user, the majority of the vacuum tube solar water heaters purchased have a market share of more than 80%. It turns out that just because of a bigger reason, vacuum tube solar water heaters are cheaper.

This is also an important reason why solar water heaters have been widely promoted in recent years, especially in the vast rural areas, vacuum tube solar water heaters meet the user's low-cost consumption, installation is very convenient, put on the roof of their bungalow, and even the fixation of the bracket can be saved.

Listening to the chief's introduction that this magic device is a "vacuum tube solar water heater", which can directly convert sunlight into heat energy, can heat cold water from low temperature to high temperature, and then can meet their hot water use in life and production, then everyone's eyes can't help but widen.

"Chief, you said in your previous sermon that in this 'energy conversion', 'electric energy' can be converted into 'heat energy', and it turns out that this 'solar energy' can also be converted into 'heat energy'!" At this time, a young man who was listening to the lecture suddenly spoke.

It turned out that for the past few months, Yellowstone had preached in the Great Hall every Saturday, in addition to telling stories from the "Holy Scriptures", to popularize some scientific knowledge of nature to these people on the island.

For example, after he started the Cummins 100KW diesel generator last month, he gave a long speech on the theme of "the arrival of the electricity age" in a sermon that weekend.

In his speech, he briefly mentioned "energy transformation". Speaking of electricity, it can be converted into heat, such as an electric oven in the kitchen. Electrical energy can be converted into chemical energy, and students can be given the electrolysis experiment that they did in nature class. Electrical energy can also be converted into mechanical energy, such as an electric motor in a water pump.

Of course, in the same way, thermal energy can also be converted into electrical energy, such as thermal power generation, or chemical energy, or mechanical energy, such as steam engines, but not into potential energy. Chemical energy can be converted into electrical energy and heat energy. Mechanical energy can be converted into electrical, thermal, and potential energy. Potential energy can be converted into electrical energy, mechanical energy, etc.

The more important thing is the mutual conversion of mechanical energy and potential energy, the energy conversion process is accompanied by energy loss, it is impossible to achieve 100% complete conversion, it is a one-way irreversible process. But these are complicated and not mentioned in that sermon in Yellowstone.

"Hehe, you're right, but this solar energy can be converted into not only heat, but also electricity." Huang Shi smiled and gave an affirmation to the young man who asked him, he remembered that this young man, others seemed to call him "Little Brother Tang", and now he was working as a construction worker with Niu Dali.

"Ahh "Solar energy" can also be converted into "electrical energy", which makes Niu Dali and their knowledge rise again.

"Chief, is that also using this magic weapon?" At this time, another young man named Li Renjun asked.

"That's not." Huang Shi shook his head, what can generate electricity is solar panels, it and solar water heaters are two different products, vacuum tube solar water heaters are not like flat panel solar water heaters, and there are no solar panels on them.

The round glass tubular collector tube on the vacuum tube solar water heater only absorbs the internal energy from solar radiation, and the process from solar energy to the internal energy of the water heater is only the transfer of internal energy, while the solar panel converts light energy into electrical energy, so it is not simply "solar energy" into "thermal energy" and "electrical energy".

However, if these contents really want to be explained, it will take a long time, and there is no need for that, so Huangshi made a vague brush, "Solar panels are used to convert solar energy into light energy, and solar panels are actually available on our island." ”

After saying that, he pressed his hands down to the ground, and seeing that some of them were young and eager to try, he smiled and said, "However, I won't let you go to find it until this thing is done." ”

……

"These are the 'collector tubes' I just mentioned, and the 'collector tubes' are the use of hot water to float and cold water to sink, so that the water can produce microcirculation and produce the hot water we want." Huang Shi pointed to the blue and faint solar vacuum collector tubes and said.

The structure of these vacuum collector tubes is divided into an outer tube and an inner tube, and a selective absorption coating is plated on the outer wall of the inner tube. The material is generally borosilicate3. 3. Extra-hard glass manufacturing, selective heat absorbing film adopts vacuum sputtering selective coating process.

Its function is equivalent to the electric heating pipe in an electric water heater, but unlike electric water heaters and gas water heaters, solar collectors use the radiant heat of the sun, so the heating time can only take effect when the solar irradiation reaches a certain value.

Then Huang Shi pointed to the big round bucket on the top of the water heater and said, "This is the thermal insulation tank for storing hot water, and when the weather is fine during the day, it collects hot water through the collector pipes I just mentioned, and then flows into these thermal insulation tanks for storage, which can prevent heat loss, and the water is still hot when we take a shower at night." ”

"This insulated water tank is composed of three parts: the inner tank, the insulation layer, and the water tank shell." Huangshi explained the structure of the water heater so carefully because the person sitting underneath was responsible for installing and maintaining them.

However, in general, the tank liner is an important part of storing hot water, and the strength and corrosion resistance of the materials used are very important. There are stainless steel, enamel and other materials on the market. The quality of the insulation material of the insulation layer is directly related to the effect of heat preservation, which is especially important in the cold season. The best insulation method is polyurethane integral foaming process heat preservation. The shell is generally color steel plate, aluminum-zinc plate or stainless steel plate.

Therefore, such an important part is really not easy to break, if it is really broken, the manufacturer still has a one-year warranty and a three-year warranty commitment, Hu Zhentian They only need to know how to remove it, and Huangshi will return them to the manufacturer.

"This is a stainless steel bracket with paint sprayed on it, so it is not easy to age and rust." Huang Shi shook the iron frame that supported the collector and the insulated water tank, the structure was triangular, it looked very solid, and he shook it for a while, and stood firmly on the roof.

He then introduced several connecting pipes of the solar water heater, including the inlet pipe that directs cold water into the hot water storage tank, the hot water pipe that transports heat to the insulated water tank through the collector, and the outlet pipe that outputs to the user's home. This set of connecting pipes is connected to the hot water storage tank, so that the whole system forms a closed loop.

"At the end of the day, let me tell you, this is the controller of the water heater."

Niu Dali and the others saw a white rectangular box appear in Huang Shi's hand after speaking, this box was somewhat similar to the air conditioning remote controls they had seen before, but it would be larger.

"The function of this remote control is to start the water supply, water full and water cut-off, regular heating, heating temperature, as well as the function of displaying the water temperature and water level, and prompting the fault alarm." Huang Shi said and raised the remote control in his hand.

Now the general household solar water heater needs automatic or semi-automatic operation, the control system is indispensable, like the solar water heater he bought back this time also has functions such as electric auxiliary heating and leakage protection, anti-dry boiling, etc., if they have a mobile phone, they can also use mobile phone SMS control.

Then, Huang Shi handed the remote control to Niu Dali, let them pass it around, and then asked them, "Okay, I have finished introducing the basic information of this water heater, you can ask any questions again." ”

"Okay, Xiao Li, you can come." As soon as Huang Shi's voice fell, he found Li Renjun, who had just asked, he raised his hand again, this rule was set by Huang Shi, students in the classroom should raise their hands when they ask questions, and soldiers in the army should shout "report" when they ask questions, so the same rules should be had when he is in a meeting.

"Chief, how many people can use this water heater?" It turned out that last month, people on the whole island had entered the model house to visit, Li Renjun had seen that kind of electric water heater, and heard the Honger girl say that it could only wash three or four people at most, so now this solar water heater, the insulation bucket is much larger, and I can't help but want to ask how many people can wash.

"This one, at least 10 people." Huang Shi smiled and patted the big round bucket, because the average person needs to use about 30 liters of water to take a bath, and the one next to him is 300 liters, so it is enough for 10 people to wash, and it also has electric auxiliary heating.

"Whoa!" This number immediately surprised everyone, obviously they didn't expect it to be so much.

At this time, Niu Dali also spoke and asked, "Chief, what are we going to do later?" ”