シャドーイング練習: Air Conditioning System Basics hvacr how does it work - 動画で英語スピーキングを学ぶ
レッスンを作成中...
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sponsored by danfoss when we look at a typical refrigeration system we have the compressor
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the condenser the expansion valve and the evaporator the condenser
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and the evaporator are both heat exchangers the condenser sits outside the property
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and the evaporator sits inside the room being cooled the compressor circulates a refrigerant in the pipe work
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which cycles between all of these components the expansion valve regulates
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the flow of refrigerant the refrigerant is a specially designed fluid
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which can change between being a liquid and a gas very easily and that's
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because it has a very low boiling point for example refrigerant
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are for 10 a will boil at negative 48 degrees Celsius
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or negative 55 degrees Fahrenheit although this will change with pressure
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but if the refrigerant is inside a pipe within a room
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and the room is at 30 degrees Celsius
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or 86 degrees Fahrenheit then this will be more than enough to cause it to boil from a liquid into a vapor.
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By the way if you want some refrigerant charts you can download these for free from our website.
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I'll link to these in the video description down below.
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So the The refrigerant is entering the evaporator as a low pressure, low temperature liquid vapor mixture.
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It flows on the inside of the pipe
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and at the same time a fan is moving the ambient air of the room over the outside of the pipe.
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This causes the refrigerant to boil.
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It will absorb the heat from the air through the pipe wall and then it evaporates.
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As the refrigerant evaporates, it carries away the heat.
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It's similar to when we boiled water.
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The water heats up, it evaporates and turns into steam and carries this heat away.
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So the air on the outside is entering hot and it's leaving cold.
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The refrigerant continues to travel through the evaporator, picking up more heat which boils it further until it becomes slightly superheated.
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This basically means it's now completely gas and doesn't contain any droplets of liquid refrigerant.
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Liquid damages the compressor, so we want to ensure it can't reach the compressor.
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The compressor sucks in the refrigerant, which is leaving the evaporator as a low -pressure, low -temperature, slightly superheated vapour.
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It then squeezes this together into a much smaller space, and so the pressure increases.
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All the heat which was picked up in the evaporator is now contained in a much smaller volume, so the temperature will increase.
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This is very important and we will see why in just a moment.
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But if you've ever pumped up a bicycle tyre, you will notice the pump becomes hotter as it's compressing the air.
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The refrigerant is then pushed into the condenser where it enters as a high -pressure, high -temperature, superheated vapour.
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the condenser is located outside
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and the outside air might be very warm on a summer's
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day as heat always flows from hot to cold we need to ensure
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that the refrigerant is hotter than the outside air otherwise the
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unwanted heat will not be able to leave the refrigerant and leave our system
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a fan will help to blow ambient air over the condenser to remove this heat
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so the outside air is entering warm picking up heat
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and leaving hot as the heat is removed by the air
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this causes the refrigerant to condense back into a liquid it's a little bit like
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when steam hits the window on a cold day the window is cold
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so it condenses the steam from a vapor into a liquid
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and then this liquid starts to run down the window the
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refrigerant therefore exits as a high pressure medium temperature saturated liquid
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and this heads to the expansion valve the expansion valve needs
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to regulate the amount of refrigerant entering the evaporator to control the superheat
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if it allows too much refrigerant to flow it can flood the evaporator
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so the refrigerant doesn't evaporate a liquid reaches the compressor
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and possibly destroys it but
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if it lets in too little refrigerant the system won't provide enough cooling and
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so it operates inefficiently the expansion valve regulates the refrigerant by
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only allowing it to pass through a small hole this creates
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a large pressure difference across the valve one side is the high -pressure liquid the other side is almost empty
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The small hole causes it to almost spray into the evaporator as a part liquid, part vapor mixture.
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The refrigerant will expand to try and fill the empty space on the other side
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and this will cause it to drop in pressure as well as temperature.
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It's a little bit like spraying a deodorant can or a spray paint can.
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It flows through a small hole causing it to expand as a part vapor
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and part liquid mixture
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and then we can feel the can become cooler now the
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original method to control this was by using a fixed orifice device
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and you might still find these on the back of your
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refrigerators the hole within this device was a fixed size
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so the entire system would simply turn on
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and off to meet the cooling demand it does work
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but we can't maintain a stable temperature control
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because the system is simply turning on
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and off the next evolution was the thermostatic expansion valve this is still widely used today
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and it senses the superheat at the outlet through a bulb
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which is filled with another refrigerant this other refrigerant will expand to close the valve
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when the superheat is too high and it condenses to open the valve when the superheat is too low.
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This type of valve needs to be manually calculated and adjusted by a technician.
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It does work very well but it's prone to mistakes.
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It also takes a long time to calculate and set up
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and it is also only adjusted once per service visit which is not ideal.
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It will also not allow peak performance.
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However it does work very well and these will continue to be used for many years.
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And And so the latest evolution is to use electronic expansion valves.
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These use a controller to measure the exact temperature and pressure
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and adjust the valve position automatically in real time to ensure optimal performance and maximum system efficiency.
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Okay that's it for this video but to continue learning about HVAC
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and refrigeration engineering click on one of the videos on screen now and I'll catch you there for the next lesson.
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Don't forget to follow us on Facebook, Twitter, LinkedIn, Instagram as well as theengineeringmindset .com
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このレッスンの語彙とスピーキングのポイント
このスピーキングレッスンは、動画「Air Conditioning System Basics hvacr how does it work」を教材にしています。 繰り返し出てくる語は次のとおりです：refrigerant, liquid, valve, heat, evaporator。 この動画には、シャドーイング用の文が85文、単語が1097語あります。 音声の長さは7:15です。 話す速さは1分あたり約151語で、日常会話に近い自然なペースです。 英語の頻出3,000語に含まれる単語は77%だけなので、語彙は難しめです。
この動画の重要語彙
動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| liquid 名詞 | /ˈlɪk.wɪd/ | 液体, 流体 |
| valve 名詞 | /ˈvælv/ | バルブ |
| boil 動詞 | /bɔɪ(ə)l/ | 沸かす, 沸騰させる |
| pipe 名詞 | /ˈpaɪp/ | 笛 |
| vapor 名詞 | /ˈveɪpɚ/ | 気体, 蒸気 |
| expand 動詞 | /ɪkˈspænd/ | 広げる, 拡大する |
| spray 名詞 | /spɹeɪ/ | スプレー |
| adjust 動詞 | /əˈd͡ʒʌst/ | 調整する |
| regulate 動詞 | /ˈɹɛɡ.jə.leɪt/ | 調節する |
| pump 名詞 | /pʌmp/ | ポンプ, 喞筒 |
| calculate 動詞 | /ˈkælkjʊleɪt/ | 計算する |
| stable 名詞 | /ˈsteɪ.bəl/ | 馬小屋, 厩舎 |
| chart 名詞 | /t͡ʃɑɹt/ | チャート, 図表 |
| lesson 名詞 | /ˈlɛs.ən/ | 授業, 学科 |
| ideal 形容詞 | /aɪˈdi(ə)l/ | 理想的な, 理想な |
動画に出てくる句動詞
| 単語 | 意味 |
|---|---|
| pick up 動詞 | 拾う, 拾い上げる |
この動画の文法
話し手がよく使っている文型を、動画の実際の表現とともに紹介します。
| 文型 | 動画での表現 |
|---|---|
| 受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる | being cooled · was picked · is located |
| 関係詞節 who / which + 節 — 人や物について情報を加える | refrigerant, which is · heat which was · visit which is |
注意したい発音
話し手はcan't, doesn't, I'llなど、短縮形や弱形を9回使っています。聞こえたとおりの短い形で発音しましょう。
- 「sh」と「zh」の音: evolution /ˌiːvəˈluːʃ(ə)n/, efficiency /ɪˈfɪʃ.ən.si/, specially /ˈspɛʃəli/, technician /tɛkˈnɪʃən/
- 長い単語（アクセントの位置に注意）: evolution /ˌiːvəˈluːʃ(ə)n/, efficiency /ɪˈfɪʃ.ən.si/, manually /ˈmænj(u)əliː/, refrigerator /ɹɪˈfɹɪd͡ʒ.əˌɹeɪ.tɚ/, evaporator /ɪˈvæp.ə.ɹeɪt.ɚ/
日本語話者が苦手な音：
- /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: regulate /ˈɹɛɡ.jə.leɪt/, controller /kənˈtɹoʊlɚ/, droplet /ˈdɹɑplət/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: valve /ˈvælv/, vapor /ˈveɪpɚ/, evolution /ˌiːvəˈluːʃ(ə)n/, evaporator /ɪˈvæp.ə.ɹeɪt.ɚ/, evaporate /ɪˈvæp.ə.ɹeɪt/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: efficiency /ɪˈfɪʃ.ən.si/, flood /flʌd/, fluid /ˈflu.ɪd/, refrigerator /ɹɪˈfɹɪd͡ʒ.əˌɹeɪ.tɚ/
この動画での練習方法
- まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
- まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
- 自分の声を録音して元の音声と比べます。liquid, valve, boilなどの単語に特に注意しましょう。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。