Several energy-efficient solutions (Part 3)

     13. When you can buy a new car, choose a gas-saving type. Instead of going to consume 1 gallon of gas that only goes 30km, if your car goes 64km with the same amount of gas consumption and you travel 16,000km per year, you will reduce about 7,000kg CO2 emissions.

     14. Reduce the amount of domestic waste. The way is to minimize the use of pre-packaged products or you can use products that are reusable and recyclable. Cutting or recycling each kilogram of waste to the environment will save energy and reduce at least 0.5kg of CO2 emissions.

     15. Recycle the refrigerant of the vehicle’s air conditioning system. In the United States, leaks from car air-conditioning systems are the main cause of CFC emissions, a substance that pores the ozone layer and causes the warming effect of the earth.

16. Insulation for walls and roof. This reduces energy costs by 20% to 30% and reduces CO2 emissions from 300 kg to 2500 kg per year.

     17. Modernizing the window system. Replace the traditional door with double-layer glass doors, between two layers of glass with argon gas. Using this type of glass door can reduce 2.4 tons of CO2 annually for gas-heated apartments, 3.9 tons for oil heating and 9.8 tons for electric heating.

     18. Plant trees and light-colored walls. If you live in hot climates or painted in dark colors if you live in a cold climate. Reducing energy consumption by utilizing shade from the right paint colors can help you reduce up to 2.4 tons of CO2 per year.

     19. Install energy efficient equipment and implement energy saving and minimizing measures in the workplace. Establish or join local associations and groups and work with authorities to implement these measures in schools and public buildings

     20. Contact local and national environmental authorities to get your opinion on economical and efficient use of energy as well as environmental issues.

Several energy-efficient solutions (Part 2)

     6. Don’t overdo the heater and air conditioner. A 2 degree reduction in the heater in winter will help reduce 6% of CO2 emissions, equivalent to 191 kg of CO2.

7. Regularly clean and replace the filter. Energy is lost when air conditioners and heaters have to work “harder” to draw air through a dusty filter. Cleaning the filter will save 5% of energy and reduce 80kg of CO2 emissions.

     8. Use energy-saving compact bulbs for the best light efficiency. Although the initial investment cost is higher than conventional bulbs, compact bulbs in the long run will be more economical because they only use of the electricity and have a lifespan of 8-12 times longer than conventional bulbs. provides equivalent brightness. When lighting a normal bulb, only 10% of the electricity is used to light up and the remaining 90% of the electricity is only used to make the bulb heat up.

     9. Insulate your hot water heating system at a cost of only $ 10- $ 20 but will save 450 kg of gas for hot water heating

     10. Install a nozzle to reduce water flow to limit hot water use. It costs about $ 10- $ 20 but annually reduces about 650 kg of CO2 emissions and saves 200 kg of gas.

     11. Self-conditioning indoor / apartment. Seal up air leaks on windows or doors. This costs only about $ 1 per window and will reduce 2,500kg of CO2 emissions. Ask your supplier to do an energy audit to see if your home is energy efficient or not. This service can be either free or for a very small cost. Make sure they check your home heating and air conditioning system as well.

     12. Walk, bike, carpool or use public transport whenever possible. For example, if your car travels 30 km and consumes 1 gallon of gasoline, each year you reduce 3200km of travel will reduce 4000kg CO2 per year.

Several energy-efficient solutions (Part 1)

Saving energy not only saves money but also reduces the need to use fossil fuels such as kerosene, coal, natural gas.

Reducing the use of these fuels also means reducing CO2 – the main cause of global warming and other forms of pollution – is released into the environment.

     With just a few small actions, you will reduce a large amount of CO2 emissions and reduce the cost of household bills.

     1. Increase the refrigerator’s temperature. Refrigerators consume about 20% of the electricity of all appliances in the home. Make sure the power save mode switch is always turned on. Check the gaskets around the doors to make sure they stay clean and snug.

     2. Set the washing machine to warm or cold water, not the hot wash mode. This will reduce about 227 kg of CO2 for electric machines to heat water and 68 kg of CO2 for gas types.

     3. Make sure that when washing dishes with a machine, the bowls and dishes must be filled in the basket.  You can turn off the chopsticks drying mode. This will save you 20% of your machine’s electricity consumption.

     4. Reduce the temperature of the hot water heater. Instead of setting the temperature to 600C, set 500C. If each family reduced the temperature of the hot water heater to 100C, we would reduce 45 million tons of CO2 emissions each year – equivalent to the amount of CO2 emitted by both Kuwait or Lebanon.

     5. Every time you replace old appliances, choose energy-efficient products. Look to see if there is an energy saving label on the product. Buy the product best suited to the needs of the family, not too big. A horizontal cage washing machine, for example, can save 60% to 70% of water usage compared to a vertical cage machine. Replacing a 1973 refrigerator with a new energy-efficient model could reduce 1.4 tons of CO2 emissions. Buying a solar water heater system reduces 4.9 tons of CO2 per year.

Alternative energy sources in the future (Part 2)

On the surface of the earth there is a huge source of heat that humans have not exploited and utilized, one of which is heat from volcanoes.

The researchers believe that people can use this abundant source of heat to generate electricity for activities in public places, such as lights on the streets. This is a source of clean, abundant energy and promises to be exploited in the near future.

Energy from wind

Compared with large-scale “windmill” fields, a small-scale wind power generation system can provide enough electricity for each household. The average mini windmill system can produce 1-10kw of electricity, enough to provide the amount of electricity for lighting and other electric devices in a house.

America is one of the countries using wind energy the largest in the world today. Windmills in the US provide about 18,000 megawatts of electricity to at least 5.4 million households living in the country. According to estimates of the US energy agency, by 2030, the windmills will provide an amount of electricity accounting for about a fifth of the electricity that the country uses. Currently in the world, many countries are focusing on exploiting this energy source. In addition to the US, Denmark is also a country that uses a large amount of wind power with 20% of the energy that its people currently use is supplied by windmill fields.


There are two ways in the world to collect solar energy: mirror systems that focus sunlight to heat water to create steam that drives generating turbines, and a second way to use solar panels is to convert heat energy into electricity. Both methods are currently being used and are very effective.

Nuclear energy

The developed countries in the world are currently using this type of energy mainly and in the future, nuclear energy will still be the number one priority for many countries in the world. In the US alone, this country is currently planning to build 100 new nuclear reactors to power one-fifth of the nation’s population.

Alternative energy sources in the future (Part 1)

Faced with the danger that limited fossil energy resources on the earth are gradually running out, new energy sources have been gradually being more interested by scientists and people. They are considered to be important energy sources in the future.

Faced with the danger that limited fossil energy resources on the earth are gradually running out, new energy sources have been gradually being more interested by scientists and people. They are considered to be important energy sources in the future.

Generating electricity from steam on the sea surface

There is a natural phenomenon that occurs frequently in the ocean: when the sun’s rays hit the water, the water on the surface begins to heat up and evaporate. Taking advantage of this phenomenon, scientists have come up with the idea of ​​producing electricity from this phenomenon. The project is called OTEC (ocean thermal energy conversion – converting energy from water vapor in the ocean).

Accordingly, people will take advantage of the water heated by the sun on the surface of the sea to heat ammonia gases and liquids with low boiling point. The purpose of this work is to create a stream of gas that pushes the turbines to spin to produce electricity. The gas is then cooled by seawater and reused again. This process goes on continuously, causing the turbines to continuously work to produce electricity.

According to scientists, this is an extremely abundant source of electricity. With less than 1/10 of 1% of the solar energy absorbed in the ocean, it could produce 20 times more electricity than it needs to supply the US needs in a day. . The only problem is that the cost of building such structures at sea is not small.

Energy from hydrogen gas

To create this energy source, it is necessary to arrange the hydrogen compartments in liquid form and the duct for this hydrogen gas to react with oxygen gas to form a stream of electrons that rotates the electric motor. This energy source is mainly used to operate environmentally friendly cars. The only waste this new energy generation technology produces is water (the result of a combination of hydrogen and oxygen).

Generates energy from ocean waves

To do this, the scientists used a hydrodynamic device that resembles the shape of a windmill operating in water. When water from rivers or waves at sea hits the device, it spins turbines and generates electric current. In principle, the system works and generates electricity exactly like the windmills. Scientists evaluate this is an extremely abundant source of energy that humanity can utilize, and at the same time can help the earth reduce the impact of the greenhouse effect.

8 Benefits Of Using Solar Power

Solar energy is obtained from solar radiation and it can be converted into electricity or heat. Solar energy is a renewable resource that is available in nature and is free for all to use. 

Thanks to advancements in technology, we can now harness even more solar energy into a constant source of electricity available to us. Here are 8 benefits of using this renewable solar power.

1. Reduce the impact on the environment

Solar power has very little negative impact on the environment compared to any other energy source. It does not create greenhouse gases, does not pollute water, has no impact on the surrounding environment. It also requires very little water to maintain, such as nuclear power plants, which require 20 times more water. Solar power generation does not make any noise, which is a great benefit when installing solar power projects in urban areas.

Hệ thống điện năng lượng mặt trời tập trung CSP

2. Reduce electricity bills

Generating your own electricity means you will use less electricity from the supplier. This will instantly translate into savings on your energy bills. Alternatively, you can also make money by selling the unused electricity, which you generated, back to the grid. The more energy you produce, the less electricity you will need from the supplier, which will increase your self-reliance when producing breakdowns.

3. Use solar electricity during peak hours

Energy demand tends to be higher during the peak time frame at 09:30 – 11:30 and evening at 17:00 – 20:00 from Monday to Saturday. . With the additional solar input, the prices within those timeframes can be reduced. To save electricity effectively, especially during hot weather, you should use electricity to operate properly electrical equipment, especially cooling equipment.

4. Solar electricity is applied everywhere

As long as there is sunlight, solar energy can be deployed anywhere. This is especially useful for remote areas without access to any other power source. There are a large number of people around the world who have no electricity. Independent solar systems can be deployed in those areas and improve the lives of millions. Furthermore, solar energy is also used to power spacecraft and boats.

Máy nước nóng năng lượng mặt trời trên mái nhà

5. Roof cooling and protection

Solar power system built on the roofs of households, factories, resorts … is open and concentrated in sunlight. Installing solar power will help cool your home, reduce the natural impact on the home’s infrastructure, but also create electricity for your living and production activities.

6. Less electricity loss during long distance transportation

Some of the energy, about 3-5%, is lost during transportation and distribution. The longer the distance between the production point and the supply point, the more energy is lost. Those losses may seem insignificant, but they can affect installation performance in areas with high population density. Having solar panels on the roof or in the yard significantly reduces this distance, thereby increasing the efficiency of the electrical system.

7. Improved grid security

The grid is less vulnerable to a power outage if more power plants are spread out. A network with high penetration of solar energy has thousands of energy production centers spread out. This improves the security of the grid in the event of an overload, natural disaster or caused by man.

8. Create jobs

Most of the cost associated with the solar energy system comes from the installation of the panels. This contributes to local job creation. Using the solar system boosts the economy and positively affects the local community.

What is solar power and the role of solar energy? (Part 2)

Other applications from solar energy

Create water heaters using heat from the sun for use in living, swimming pools, …

Solar heating system is applied in construction, using monolithic materials such as stone, cement, water, …

Water treatment systems use solar heat and solar electricity to desalinate or disinfect

Solar cookers, people also use the technique of converging sunlight to create heat for cooking, typically industrial kitchens in India are serving up to 35,000 meals per day.

Solar electric vehicle

Countries around the world have developed various types of solar-powered vehicles such as cars, planes, ships, balloons. In Australia, they hold an annual race called the “World Sun Challenge” for universities and businesses to compete on long distances of 3,021km, the most recent winners’ speed up. to 90.87 km/h.

Solar power storage

Since solar power generating systems only generate electricity directly in daylight conditions with good lighting, storing electricity or maintaining solar power generation for service at night is a problem. important issues to deal with.

To regulate the temperature in the home, construction engineers design monolithic systems to store the sun’s thermal energy to warm or cool the home.

For the operation of CSP plants (centralized solar power plants), use molten salt stored in storage tanks to keep the plant running.

With photovoltaic battery systems to generate solar power, the most common form is using rechargeable battery systems for complete storage (for independent solar power systems ) or excess electricity. (for grid-connected solar power systems ).

The development of solar power

With the development history of photovoltaic batteries over half a century, the technology and efficiency of solar power systems have increased significantly, major manufacturers in the world are still constantly researching to improve the performance of solar batteries. Manufacturing standards and raw materials are also being raised to meet health and environmental requirements.

Great benefits from solar power

Solar power is the source of electricity converted from sunlight energy into electricity, so first we have an infinite resource to exploit.

Economic significance of solar power

The supply is endless, the cost of producing solar cells is decreasing, the output of electricity is increasing over time, contributing to reducing the cost of electricity consumption.

Energy security

Future solar power could replace other forms of electricity generation from burning fossil fuels as well as restrict hydropower changing ecosystems.

Environmental benefits of solar power

Solar power is recognized as a green, clean and environmentally friendly source of energy, solar cell recycling technology has also gradually improved, according to 2014 statistics,  the average CO2 emissions of solar power is 41g/kWh compared with coal power is 820g/kWh and oil and gas is 490g/kWh

In addition, solar power is widely used in human life from daily life to production, capable of deploying on a very diverse scale and suitable for all subjects.

What is solar power and the role of solar energy? (Part 1)

Solar power is created in two popular ways in the world today: using solar panels and using the heat capture system (centralized solar power CSP) to operate the flux power plant.

What is solar power?

Solar power is electricity generated from the conversion of sunlight into electricity by using solar panels or from a solar power plant based on the reflection principle to operate the boiler. the water turns the turbines to generate electricity.

Solar battery

Solar cells, also known as photovoltaic cells (PV: Photovoltaic ), solar cells are devices that convert sunlight into electricity, this generated electricity is also commonly known as energy electricity. Sun. The mechanism of action of this device is based on the photoelectric effect in physics.

See more about how solar cells work:

Solar cells were first created in 1880, in 1954 silicon solar cells created by researchers Gerald Pearson, Calvin Fuller and Daryl Chapin from the US, the original selling price of energy cells. the sun is up to 286 USD/watt with conversion efficiency of only 4.5-6%.

Silicon solar cell technology has been developed until now, major manufacturers in the world such as Canadian , Sharp, Q-cell, .. have improved the technology and raised the efficiency level to 16-25. % and nearly 40% in laboratories. In the future, solar cell technology will continue to be developed to be more efficient in many aspects.

Centralized solar power

The CSP: Concentrated solar power system uses mirrors, lenses, and tracking systems to reflect sunlight over a wide area into a small beam that generates enormous heat. This heat is used to melt salt at temperatures up to 566 0 C. The molten salt is led to boil the water tank to create a strong steam flow that turns the generator turbine.

Historically, the first person to use this technique was the great Greek scientist Acsimet (Archimedes), who used a bronze mirror to focus the sunlight that burned Roman ships.

The advantage of the CSP system is that the raw materials for the production of equipment are quite popular and cheap, high efficiency, does not adversely affect the environment, but only suitable for building power large solar energy.

The pros and cons of wind energy (Part 2)

The defect of wind energy

1. The biggest drawback to wind power is that it is discontinuous. Electricity can be produced and provided adequately when the wind is strong enough, there are times when the wind settles, producing electricity by wind power is impossible. Efforts have been made to store wind energy successfully and use it in conjunction with other forms of energy, however, to make this source of energy a major source of energy in the near future, This needs to be quicker and more spacious.

2. Due to the intermittent nature of wind energy, it needs to be stored or additional ordinary energy sources must be used. However, its storage costs a lot of money and countries have to use fossil fuel plants to meet their energy needs.

3. There have been previous reports of the dangers posed by windmills to birds. Because of the considerable height of windmills, it often causes collisions with flying birds, and a large number of birds die for this reason.

4. Windmill installation faces severe opposition from people living in a neighborhood where wind power plants were planned to be built. Factors such as the speed of the wind and its frequency are taken into account before choosing where to install a windmill and sometimes locals strongly oppose the plan. One of the main reasons for their opposition is that windmills will cause noise pollution.

In addition, some argue that wind turbines adversely affect the aesthetics of a city and the tourism industry in their area.

We have just shared some advantages and disadvantages of wind energy. Wind power is undoubtedly one of the future sources of energy, but it is important that governments around the world need to allocate resources to improve existing technologies. While wind energy has its drawbacks, we have no reason to forsake this renewable source of clean energy and hinder efforts to realize its full potential.

Little known things about wind energy

Wind is abundant, green and clean energy for the environment. For centuries, people have known how to take advantage of the wind to produce and generate electricity.

However, there are some interesting things that we may not know about this type of energy.

1. Wind is one of the oldest forms of energy

From 5,000 BC, the effects of wind have been known in sailing. Sailors were the first to find an easier way to navigate the sea, laying the groundwork for human understanding of important concepts like dynamics and lift. Starting with the winged mill, these principles became the key to the next innovation, opening the revolution to automating time-consuming activities in agriculture.

Practical applications of wind were also found in the ninth century in Iran (as described by Abu Ishaq al-Istakhri). It is also a large form of pinwheels with propellers with a cloth-covered structure and a transmission system with ropes, pulleys used to move large stones in construction or to transfer water from lower to higher. Rough engines in pinwheel formations in India and Iran have vertical rotating shafts, and horizontal rotating discs.

2. MW of wind energy reduces 2,600 tons of CO2

According to information from the US Renewable Energy Laboratory (NREL), wind power is of interest because 1MW of wind power produced will help reduce about 2,600 tons of CO2 emissions into the environment. The fact that the less fossil fuel is consumed, the less CO2 it emits and the lower its CO2 emissions, which is now the standard for monitoring the progress of adopting alternative forms of energy.

A typical example is in Massachusetts (USA), in 2004, on average each citizen of this state emitted 4.5 tons of CO2 from using electricity. Meanwhile, only 1 MW of wind power can supply about 400 houses without emitting any CO2. Besides reducing CO2 emissions, wind power also brings more benefits than hydroelectricity, 1MW of wind power will save about 1,293 million liters of water.

3. Actual wind energy is solar

The source of this endless green energy is from the sun. Sunlight warms our planet, but because the Earth is constantly moving, the surface of the Earth is not even, making the temperature different from place to place.

The difference in temperature causes abnormalities in atmospheric pressure; gas molecules will move from the high pressure area to the low pressure area, forming the wind. The intensity, blowing time and wind direction are influenced by a number of factors such as weather, vegetation, water surface and topography.

All of these volatile factors make the wind unpredictable and become one of the reasons for the concern that wind is never stable enough to provide for human energy needs. The most predictable winds blow around the coast, increasing the cost of building wind farms.

4. Wind power does not pose a threat to birds

One of the main concerns of the opposition to wind power is the danger of wind turbines to wildlife, especially birds. However, despite its enormous size and dangerous speed, the wind turbines do not affect the wildlife, or flight paths of birds. Research by the National Academy of Sciences in the United States confirmed that the number of birds killed by wind farms accounts for only a negligible proportion of the total number of birds killed by humans.

5. World wind power output increased 4 times from 2000 to 2006

Wind power output increased rapidly from 2000 to 2006. Even in the year of global economic downturn in 2009, the wind power industry still developed strongly. This year alone, world wind power production has increased to 158,000 MW. Wind power is now able to meet the electricity needs of 250 million people and more than 70 countries already have wind farms.

According to a UN report, switching from fossil fuels to renewable energy (not just wind) requires more than $ 12 trillion. This commitment is not easy to implement in the next two decades, especially when traditional materials are still relatively cheap. Therefore, to maintain growth from 2000 to 2006, governments need more incentives to encourage wind power development.