GEOTHERMAL LÀ GÌ

admin - 08/05/2023 17

Reading Passage 2

You should spend about 20 minutes on Questions 14-26, which are based on Reading Passage Two.

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POWER FROM THE EARTH

Geothermal nguồn refers lớn the generation of electrical power nguồn by making use of heat sources found well below the earth's surface.

As is well-known, if a hole were to be drilled deep into the earth, extremely hot, molten rock would soon be encountered. At depths of 30 to lớn 50 km, temperatures exceeding 1000 degrees Celsius prevail. Obviously, accessing such temperatures would provide a wonderful source for geothermal power. The problem is, such depths are too difficult khổng lồ access: drilling down some 30 or more kilometres is simply too costly with today's technology.

Fortunately, sufficiently hot temperatures are available at considerably shallower depths. In certain areas, where the earth's surface has been altered over time—through, for example, volcanic activity-temperatures exceeding 300 degrees Celsius can be found at depths of a mere 1 to 3 km, which can be feasibly accessed. These particular areas are potentially ideal for the generation of electricity through geothermal means.

It is possible to explain geothermal power nguồn generation as a steam power nguồn system that utilizes the earth itself as a boiler. When water is sent down lớn the depths of 1 to 3 km, it returns khổng lồ the surface as steam & is capable of generating electricity. Electricity generated in this manner hardly produces any carbon dioxide or other waste materials. If the steam and hot water are routed back underground, the generation of electricity can be semi-permanent in nature.

Furthermore, geothermal power can provide a stable supply of electricity unlike other natural energy sources such as solar power and wind power, which both rely heavily on weather conditions. Accordingly, the generation of electricity through geothermal power is four khổng lồ five times more efficient than through solar power.

As for wind power, geothermal power is some two times more cost effective. Only the generation of hydroelectric nguồn comes close— the cost of power production from each is about the same.

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Although geothermal power nguồn generation appears khổng lồ be a most attractive option, development has been slow. The world's first successful attempt at geothermal power nguồn generation was accomplished in Italy in 1904. Power nguồn generation in nhật bản first started in 1925 at Beppu City. Since that time, countries as diverse as Iceland and New Zealand have joined the list of nations making use of this valuable source of energy. In the year 2000, Beppu thành phố hosted the World Geothermal Congress, whose goal was khổng lồ promote the adoption of geothermal energy production throughout the world.

The international geothermal community at the World Geothermal Congress 2000 called upon the governments of nations khổng lồ make strong commitments khổng lồ the development of their indigenous geo-thermal resources for the benefit of their own people, humanity và the environment. However, several factors are still hindering the development of geothermal power nguồn generation. Firstly, it has a low density of energy which makes it unsuitable for large-scale production in which, for example, over 1,000,000 kilowatts need to be produced. Secondly, the cost is still high when compared khổng lồ today's most common sources of energy production: fossil fuels và atomic energy.

A further consideration is the amount of risk involved in successfully setting up a new geothermal nguồn production facility. The drill-ing that must extend 2,000 khổng lồ 3,000 m below the surface must be accurate to within a matter of just a few metres one side or the other of the targeted location. Khổng lồ achieve this, extensive surveys, drilling expertise and time are needed. It is not uncommon for a project to lớn encompass ten years from its planning stage to lớn the start of operations. The extent of the risks involved is clear.

Although it has long been considered a resource-poor nation, Japan, which is thought to lớn have about 10% of the world's geothermal resources, may well have considerable advantages for tapping into geothermal power. It does have one of the longest serving power nguồn stations using geothermal energy. The station, built in 1966, pointed the way khổng lồ the future when the country was affected by the two global oil shocks in the 1970s. Now there are some 17 plants in operation throughout the country which are responsible for a total đầu ra of over 530,000 kilowatts. This figure, though impressive, accounts for a mere 0.4% of Japan's total generation of electricity.

Clearly then, further progress needs to be made in the development of geothermal energy. As long as costs remain high in comparison to lớn other sources of energy, geothermal nguồn wilt struggle khổng lồ match the efficiency of existing power sources. Further research và inno-vation in the field, as well as government tư vấn and a sense of urgency, are needed to lớn help propel geothermal energy towards its promising future.

SECTION 2: QUESTIONS 14-26