跟读练习: How Pumped Storage Power Plants Work (Hydropower) - 通过视频学习英语口语
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So in this lesson, we're going to have a look at a special type of hydropower plant known as a pump storage power plant.
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We've already looked at how various types of hydropower plant work, and this type is not much different from some of the others we've seen.
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However, it's got quite a unique operating characteristic, which I'm going to discuss with you in a moment.
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So we can see we've got our water inlet, and that is on the opposite side of this reservoir wall.
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I'll spin around so we can actually go down and have a look at the inlet.
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There is the inlet.
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We can see we've also got a gate so we can close off the water inlet to the penstock.
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We've then got our penstock which comes down, comes all the way down the hill.
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This is actually quite a large head of pressure or a large head to have with this type of power plant.
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Now having a large to medium head is a characteristic of a pump storage power plant.
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What's unusual here is that the penstock is split into two and feeds two separate turbines.
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Remember, you don't normally see that on power plants where you have a medium to large head.
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Normally, one penstock will supply one turbine.
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Now, I'm gonna go and have a look at the turbines and generators from the outside, because I did actually try and look earlier from inside and it's quite cramped.
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We can see that we've got a turbine runner which is housed within this casing, and the water itself comes from the penstock.
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You can see it coming in here.
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It's fed to the turbine runner, And then it's discharged and it will go out through the draft tube and into the river.
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See if we can find the draft tube.
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And this is it here, and on the opposite side, we also have another draft tube.
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So this is very similar in a way to some of the other hydro plants that we looked at.
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It's just that the head is much larger.
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If we've got a larger head, then that means we can have either a Pelton type turbine
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or a Francis type turbine we're not going to have a Kaplan type turbine because the head is simply too large.
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Pump storage power plants though only utilize a Francis type turbine.
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They do not use Pelton type turbines or Kaplan.
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And there's a very simple reason for this.
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Francis type turbines can be used to pump water back up the mountain.
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That means we can generate electricity when water flows down the mountain
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and then we can pump the water back up again to the upper reservoir in order to refill the upper reservoir.
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But why would we do this?
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Why would we pump water back up and then let water back down again later?
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Well a pump storage hydropower plant is very similar to a battery, except we're not storing chemical energy.
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We're actually storing the potential energy of the water at a higher elevation.
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Let's imagine for a moment that it's a very sunny, windy day.
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And that means that we're generating a lot of electricity from wind turbines and solar power.
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This also means that electricity is cheap.
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It's in abundance.
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So imagine we're paying one cent per kilowatt hour just to keep things simple.
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Now it might be that the people operating this pump storage plant think
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that one cent per kilowatt hour is very cheap
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and they'll buy the electricity in order that they can power the Francis turbines and pump the water from the lower reservoir,
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in this case a river, up to the upper reservoir.
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And they'll do this all day because it's been sunny all day and there's also been a lot of wind, so we've got a lot of cheap electricity.
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When the upper reservoir's full, and this may take eight to 10 hours,
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maybe more, maybe less, we'll hold on to all of this stored potential energy.
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And what we'll do, we'll wait until it's dark And all of a sudden, all of that abundant electrical supply that was provided by the sun from solar power,
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and maybe the wind dies down as well, all of that abundant electrical power will disappear.
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It'll no longer be available in the national grid.
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If you like this video and would like to see more engineering related tutorials, then check out some of the links in the video description area.
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If you wanna support the channel, then please do like this video or share it on social media.
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Really does help us out.
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You can also leave a comment in the comment section.
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And if you've got any questions, then please just ask, and I will try to respond to you within 48 hours.
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Thanks very much for your time.
背景与上下文
在这节课中，讲者为我们介绍了一种特殊类型的水电站，即抽水蓄能电站。这种电站的操作原理与其他水电站相似，但它具有独特的特点。了解这些水电站的工作方式不仅有助于我们理解水力发电的原理，同时也为我们在日常生活中与他人交流提供了丰富的词汇和表达。
日常交流中的五个重要短语
- 水的入口：在水电站中，水的进口是供水的重要部分。
- 水轮机：用来发电的设备，是工作重点。
- 压力头：水从高处流下时产生的压力，影响发电效率。
- 泵送水回上游：抽水蓄能电站的一项关键功能，用于储存能量。
- 可再生能源：如风能和太阳能，与抽水蓄能电站密切相关。
逐步跟读指南
为了提高您的英语发音，建议紧跟讲者的语速和发音进行模仿，这是 shadow speech 方法的一部分。以下是一些逐步跟读的建议，帮助您更好地进行英语口语练习：
- 第一步：首先，观看视频并理解基本内容。注意讲者的语调和节奏。
- 第二步：暂停视频并逐句重复讲者所说的内容。模仿他/她的发音和语调。
- 第三步：使用专业的 shadowing site 进行练习，找到相似主题的英语材料。
- 第四步：定期跟读和录音，回放并评估自己的进步，找出发音的弱点。
- 第五步：鼓励自己进行自由对话，融入从视频中学到的新短语，进一步提高口语表达能力。
通过这些方法，您将能够在理解水电站工作原理的同时，提高您的英语口语水平，为日常交流打下坚实的基础。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。