In the hot season, air conditioners have become indispensable items in many families. However, for families with limited economic resources, it is not easy to buy a new air conditioner for 7-10 million VND. Therefore, many people choose to buy used air conditioners to save costs. Because the price of old air conditioners is usually only 30-50% of the price of new air conditioners of the same type. Old air conditioners are usually used domestic products that are liquidated, upgraded, or broken air conditioners that are bought, repaired, and sold in the market. Besides, there are also old air conditioners introduced as imported directly from Japan. Old air conditioner is the choice of many people. According to some owners of refrigeration equipment repair facilities in Hanoi, this year’s hot season, due to the impact of the Covid-19 epidemic, the economy is difficult, old air conditioners have become very popular. The old air conditioners of well-known brands such as Daikin, Panasonic, Toshiba, … with a capacity of 1.0-12.0 HP with prices ranging from 3-5 million VND / unit are interested by many customers. Currently, it is not difficult to find ads on Facebook, forums or groups selling these items, for only 3-5 million VND, for a model of air conditioner. In the hot season, on the “web market”, old air conditioners are advertised more and receive greater attention from customers, especially students, workers, and low-income people. Products for sale often come with a commitment to original, 80-90% new. Many refrigeration repair shops also took advantage of the increased demand to buy used air conditioners and imported this product. Many shop owners buy used air conditioners to repair and then resell. Customers who buy used air conditioners are free of charge for cleaning, installation of duplex gas pumps, insulation pipes, and drainage pipes to pay like new machines. Need to consider when choosing to buy used air conditioners Buying used air conditioners has the advantage of saving initial costs. But according to many experts, this is not necessarily an effective economical solution. Because buying old air conditioners has many potential risks and is also an economic problem that users need to consider carefully. If you are not careful, you will not save much, but will cause trouble, frustration, and quarrels in the house because the air conditioner does not work as expected. The monthly cost of using an old air conditioner will be much more expensive than a new one. Because old air conditioners often have low cooling efficiency because the engine has weakened after a long time of use. To create the desired coolness, the air conditioner needs to “work” more. As a result, electricity bills also increase a lot. Buying used air conditioners carries many risks. Moreover, old air conditioners have many potential risks such as spending a lot of money to repair, even being tricked into buying poor quality products. In fact, many refrigeration equipment repair facilities have not hesitated to enchant old, broken air conditioners and put them on the market and sell them at high prices. If the old air conditioner is renewed, clean the cover without interfering with the inside, then rest assured to use. But if you have touched the outdoor unit, the indoor unit of the machine or replaced the components, it has affected the life and performance of the machine. With the machine is too old, workers often use chemicals to bleach the plastic, when purchased, it looks very new but very quickly degrades. When buying these air conditioners, users think they can buy cheap goods, but in fact, they are expensive and break down quickly. Another problem is that old air conditioners often have a fault that is not cold or cold because of problems related to gas (less gas, gas leak, out of gas) or because it has a lot of dust that has not been cleaned carefully. In addition, old air conditioners often run not smoothly, or make loud noises, which may be due to excess gas, compressor problems or loose screws that are not checked and replaced. Another common mistake in old air conditioners is water leakage due to water leakage in the pipes from the cold unit; air conditioner jump atatat; the air conditioner is not running. According to electronics experts, in case you have to buy old air conditioners, you should buy them from relatives, friends or ask acquaintances who are knowledgeable about air conditioning techniques for advice to avoid being damaged or buying air conditioners. The old one is repaired and sold by a butt-cheek mechanic. Should buy products with popular brands and models, do not buy floating air conditioners. When buying, it is also necessary to carefully check the parts of the air conditioner such as the case, the hot unit, the cold unit, the gas conduction weld, etc. Should choose to buy the air conditioner at the electronics centers, reputable stores and have the mode. guarantee. If possible, buy a new air conditioner. On the market today, electronics supermarkets often launch many attractive incentives to attract customers. Accordingly, many 1- or 2-way air conditioners with a capacity of 9,000-12,000 BTU are being discounted to only 4-10 million VND per unit. New air conditioners are cheaper and cheaper, modern technology should save more electricity. Hanh Nguyen (Synthetic)

The solar power market has many attractive factors for investors. Photo: VNA According to the Japan Economic Times, the revised law to promote countermeasures to prevent global warming was approved by the Japanese National Assembly on May 26. The content that attracted attention was that the goal of carbon neutrality before 2050 was first recorded in a Japanese law. To realize the goal of a coal-free society, Japan, the US, Europe and China alone will require an investment of up to 8.5 trillion yen in the period 2021-2050. The world will enter fierce competition in the field of technology that can change the world economic map. Japan’s Law on Promoting Countermeasures to Prevent Warming is expected to come into effect in April 2022, which clearly states the provision stipulating the basic perception of the government’s goals related to the implementation ” carbon neutral” to ensure a balance between greenhouse gas emissions and the amount of gas absorbed by vegetation. The regulation in the law shows the commitment of the Japanese Government to inherit the policy even when the government has a transfer, and is the basis for promoting business investment in the long run. Around the goal of carbon neutrality, the European-American countries have expressed their intention to achieve this goal before 2050. Countries around the world are also urgently using the public-private partnership mechanism to develop the carbon neutrality. new techniques to achieve the goal of a zero-emission society. Japan is currently at the forefront of the world in the development of next-generation battery technology and is realizing hydrogen-related techniques. The development of CO2 landfilling techniques is also being evaluated in Japan. The battery needed to develop electric cars is considered as one of the indispensable techniques to realize a zero-emissions society. However, in the field of lithium-ion battery production, Japan has not shown an advantage over Chinese manufacturers such as Contemporary Amperex Technology (CATL) and South Korean chemical company LG. Perhaps Japan can only create an advantage in this area by developing a new generation of solid batteries that can extend the travel distance on a single charge that companies like Toyota and Panasonic are at the forefront of this trend. this direction. Renewable energy production devices are also said to be the key to building a zero-emission society. During the 2000s, the Sharp and Sanyo Electric companies swept the world market for solar panel development and manufacturing. However, to date, about 80% of the world’s shipments are made in China. Japanese businesses have lost in the bidding war. Expectations are being held for solar panels using materials with a special crystalline structure (Perovskite) researched and developed by Toshiba and Ricoh. The technique of using hydrogen is expected to bring about a breakthrough in achieving the goal of carbon neutrality in the iron and steel manufacturing sector, which uses a large amount of energy source and is currently the three major Japanese steel corporations as well. is collaborating on research into hydrogen-using steelmaking technology. A test furnace has been set up at Nippon Steel’s factory (Kimitsu City, Chiba Prefecture) with the goal of realizing the technique before 2030. According to calculations by chemists, hydrogen is used instead of coke, combined with the use of carbon dioxide (CO2) separation and recovery techniques, can reduce CO2 emissions into the environment by 30%. According to Astamuse, a company that analyzes patent application trends, Japan can maintain its number one position in the world in terms of patents related to hydrogen engineering. In the context that countries around the world are increasing the speed of technical development, the issue of concern is how Japan will promote public-private partnership to bring hydrogen technology to applications in industries. industry of this country. For a country as highly dependent on fossil fuels as Japan, the turning point is CCS – capturing and burying CO2 underground. Currently in the world, the US is the leading country in research, development and realization of this technology. Some companies in Japan such as J-Power and Toshiba are also promoting the development of techniques to capture and landfill CO2 generated from thermal power plants. Car manufacturers in Japan have pioneered the world in the development and popularization of the hybrid vehicle (HV) model that combines an electric motor with a gasoline engine and has made a great contribution to cutting reduce greenhouse gas emissions. Hybrid cars are widely used in Japan, but in European and American countries, the trend of using electric vehicles (EVs) is more prevalent. If they can take advantage of the electrification technique used in HV cars, Japanese enterprises are fully capable of dominating the EV development competition in the world.