Mengchen Xiao Zhen was sent from The Temple of Oufei
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"We now make the air conditioner a power station, and it doesn't cost a penny to light it at night!"
It was no one else who said this, it was Dong Mingzhu, chairman of Gree.
She claimed that if the technology were applied globally, "the global temperature could be reduced by half a degree."
As soon as the remarks came out, there was an uproar on the Internet, and as soon as the problem arrived, the number of views instantly soared to nearly 900,000.
But let's take a closer look... Isn't this a photovoltaic energy storage air conditioner!
Photovoltaic power generation, literally, is "light-generated volts", using photovoltaic semiconductors to convert solar energy into direct current power. Sounds ideal, but the current conversion efficiency is low and the material cost is expensive.
We dug deeper and found that things were not simple.
<h1 class="pgc-h-arrow-right" data-track="9" > Gree has photovoltaic air conditioners, but it does not sell well</h1>
According to a research report by China Investment Securities, as early as the end of 2013, Gree launched a photovoltaic inverter centrifuge, and since then it has been focusing on "central air conditioning without electricity charges".
According to the report of the Market Star, the central air conditioner of Gree Electric Appliances has been equipped with the "photovoltaic direct drive variable frequency centrifuge" with independent research and development and photovoltaic direct drive utilization rate of 99.04% in 2015.
The report also said that Gree's photovoltaic air conditioners have been sold overseas as early as 2015
In the blink of an eye to 2021, how is Gree's photovoltaic air conditioner?
We went to gree's official website to look at it, and found that under the commercial central air conditioning column, there are indeed two products: "photovoltaic direct drive frequency conversion multi-line" and "CVS series photovoltaic direct drive frequency conversion centrifugal chiller".
Currently, neither of these products is of the household type, so prices cannot be viewed on the official website.
However, from the perspective of Gree Dong Pearl Store, the cumulative sales volume of "CVS series photovoltaic direct drive inverter centrifuge" is still 0 pieces...
It is no wonder that Miss Dong wants to invent a new technology to upgrade photovoltaic air conditioning to "set light energy, energy storage, air conditioning" as one of the optical storage air conditioning - not only can use solar energy to generate electricity, but also energy storage to generate electricity.
However, Gree's recent photovoltaic-related patents seem to have little to do with light storage air conditioners.
Zhihu @ Moriyama said that he had written more than 20 hardware patents, but when he saw Gree's march 2021 patent, he did not understand it at first.
After careful study, @Moriyama believes that this patent feels like a bunch of things - only introduces a power switching circuit, using the high efficiency scheme of switching power supply. However, if this can also be patented, "100 can be completed in 3 days."
It seems that Gree does not intend to disclose its "new technology" from the patent.
So, from the perspective of technology and cost alone, is it feasible for Miss Dong to claim that "air conditioners become power stations"?
<h1 class="pgc-h-arrow-right" data-track="23" > "air conditioner as a power station" is feasible? </h1>
First, let's take a look at Miss Dong's description of "light storage air conditioner":
Gree is developing a new technology, can be the combination of light energy, energy storage and air conditioning, air conditioning becomes a power station, do not need to pass through the city grid, do not need remote transmission, the energy gathered up through the air conditioning power generation, in order to ensure that the air conditioning cooling or heating at the same time, the excess electrical energy storage, all the lighting at home at night, do not spend a penny on electricity.
So, is this solution feasible in the end?
From a technical point of view, according to the Times Weekly, Wu Hui, general manager of the research department of the Yiwei Economic Research Institute, said:
The combination of solar energy, energy storage and air conditioning, the logic is reasonable, and it should essentially be a distributed optical storage system. But the air conditioner itself is impossible to generate electricity, she said it should be a solar cell, an energy storage battery, the two parts together to power the air conditioner.
From a cost point of view, Liang Zhenpeng, a veteran industrial economy observer, said that the technology mentioned by Dong Mingzhu is unlikely to enter the homes of ordinary people in the next few years:
Generally speaking, the photovoltaic at the top of the house is directly integrated into the power grid, as Dong Mingzhu said, there are many problems in it. For example, what to do on rainy days, what to do on cloudy days, whether the voltage can ensure stability, etc., there are many technical problems.
Specifically, Zhihu @ Unscrupulous HR said that the recovery cost cycle of photovoltaic power generation is more than 5 years.
As for energy storage, it is generally to eat the peak-valley power difference to obtain profits, valley electricity storage, peak power generation, but in the actual use process, the energy storage battery will decay, the reserves are greatly reduced, and may not be able to return to the cost.
After netizens heard this news, they also exploded the pot.
Some netizens believe that this technology is indeed worth looking forward to.
However, some netizens believe that photovoltaic power generation itself is not feasible, and the utilization rate is too low.
Some netizens said that the feeling is iq tax, and the previous mobile phones and cars have not moved...
However, from a global perspective, light storage and air conditioning is actually not the largest power generation product of the brain hole.
There are many "hidden" self-generating schemes that make the building really "cost one kilowatt hour of electricity".
<h1 class="pgc-h-arrow-right" data-track="39" > a variety of self-generating schemes</h1>
In fact, buildings generate their own electricity, and all over the world are trying.
After all, it feels quite romantic to live a self-sufficient idyllic life.
There is a retired Swedish engineer who has made a big renovation of his family.
In the summer, when the sun is shining, the excess electricity is used to electrolyze water. The hydrogen produced is stored in the basement and then used to generate electricity from hydrogen fuel cells in winter.
Hydrogen fuel cells also generate heat during operation, and by the way, the heating problem in winter is solved.
Looking at the country, there are also ingenious building self-generation schemes.
Hanergy Group launched the "Han Wall", a scheme to generate electricity from the building's exterior walls. The technology used is thin-film solar power generation, which can be attached to the exterior walls of buildings.
It has been used in many buildings at home and abroad.
It can also be made into flexible "Han tiles" and pasted on the tiles of traditional buildings.
In addition to harnessing solar energy, wind energy is also a hot area for clean energy.
Take this sea hotel in Qatar, for example.
So pretty!
But I don't see where the power generation device is?
You wouldn't have guessed that this circular building generates electricity by rotating.
The white "umbrella" that surrounds the hotel is actually a vertical wind turbine, which can generate electricity by the wind generated by the rotation of the entire hotel.
From the above examples, it can be seen that in order to achieve not connecting to the power grid and only relying on their own power generation, the conditions are still quite harsh.
Commercial applications have to be large buildings with special designs.
Home use must also be a large independent house with enough surface area to collect solar energy, and a large basement for storing gas.
For example, the cost of the Swedish engineer's solution is about 700,000 yuan, and it will take more than 180 years to recover the cost according to the average electricity expenditure of Swedish households.
For households with only a small balcony in a city's tall buildings, it is even less cost-effective to have limited solar energy available and a lack of means of storing surplus energy in the summer.
In fact, none of the three schemes mentioned above have the biggest brain hole in the way of power generation.
Argentina is a big cattle grower, and their country's agricultural technology research institute tried to generate electricity from cattle as early as 2014.
Cows, ruminants, the microorganisms in the stomach produce a large amount of methane in the process of digesting food, and the way the cattle excrete methane is -
Fart.
According to The Argentine researchers, 300 liters of methane can be collected from a cow a day, which can be used to run a refrigerator for 24 hours.
However, there has been little new news about the project since then, and it seems to have stayed in the experimental stage.
Source of comment (authorized):
Zhihu@無良HR:https://www.zhihu.com/question/470429897/answer/1984844763
Zhihu @ Moriyama: https://www.zhihu.com/question/470429897/answer/1984201854
Reference Links:
[1]https://www.energy-observer.media/en/solutions/videos/hans-olof-nilsson-and-first-hydrogen-powered-house
[2]http://zhf.hanergythinfilmpower.com/index.php?m=content&c=index&a=show&catid=12&id=3#slide=1
[3]https://amazingarchitecture.com/hotel/eco-floating-hotel-qatar-by-hayri-atak-architectural-design-studio-haads
[4]https://www.fastcompany.com/3028933/these-backpacks-for-cows-collect-their-fart-gas-and-store-it-for-energy.
[5]http://www.ahscb.com/page/1/2015-05/04/02/2015050402_pdf.pdf
[6]https://pdf.dfcfw.com/pdf/H3_AP201312260004835087_1.pdf
[7]http://img.cheerue.com/D5C994E3-F0CF-4E81-676E-B20D75A511B0_thinkv_2018-09-14_5b9b70782a5e7.pdf
[8]https://patent-image.qichacha.com/pdf/586ff5ccdebbeed64e67e041d53d1391.pdf
[9]http://www.zhilengxuebao.com/zlxb/ch/reader/create_pdf.aspx?file_no=20160501&year_id=2016&quarter_id=5&falg=1
[10]https://www.163.com/dy/article/GEDIF6LA0519D4UH.html
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