Shadowing Practice: Envicool Full Chain Liquid Cooling 2GW+ Deployment Case Study presented by Envicool - Learn English Speaking with Video
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My name is Lin Niu.
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I'm the Product Manager for Liquid Cooling Solutions from NVQO.
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Yeah, thank you.
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Today I want to talk about our experiences in liquid cooling solutions for the past 20 years.
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And so nice to have you all here.
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And we are all here because we all know that the way we cool down the infrastructure is changing.
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The question is, how do we get there together?
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So for the following 20 minutes, I will introduce who we are, what we provide, and the ideas behind our work.
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Let's first have a very brief introduction of our company,
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in case some of you may not that familiar with us we are established in 2005 so making 20 years
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in this industry for liquid cooling
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and after 20 years developments we have been a team of over 2 000
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or 5 000 employees globally and from the very beginning of our very first liquid cooling products delivered in 2015,
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we have already delivered over two gigawatts liquid cooling solutions.
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So today I want to discuss with more about liquid cooling solutions with you, with our customers, with our partners.
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Our headquarters and main R &D centers is based in China and to maintain our competitive edge,
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we also have our U .S.
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R &D center in USA.
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It's about 20 minutes drive from here.
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And more critically, our manufacturing -based strategy is to distribute it globally.
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We have our facilities in Thailand, we have facilities in USA,
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and we also have our manufacturing bases in multiple locations in China.
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And this ensures the supply chain resiliency and it can help us to meet critical and aggressive market timeline.
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And about the service network, we have built a complete service network to ensure that wherever our customers are,
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they can easily get in touch with us to get all the supports from technical to service.
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Since 2021, we have seen a surge in customers asking about liquid cooling solutions.
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At that time, most of the rack density are from 20 to 40 kilowatts.
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And the concern of our customers are how much energy they can save if they use this liquid cooling solution.
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And what is the comparison between the air cooling and the liquid cooling?
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About the K -PACs, about the O -PACs.
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But things changed when last year NVIDIA released their NBL 72 rack.
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120 kilowatts per rack make the air cooling no longer available.
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The liquid cooling solution is not just an option solution is the only solution to that high density rack.
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And based on the explosive growth of the AI, it can be tell, it can clearly be tell that in the future,
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one megawatt per rack will be the future.
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And it's in near future, maybe in 2024, 27.
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So what will be the solution for this high -density rack.
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And from the heat transfer theory, we know that if we want to meet high cooling capacity,
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high cooling requirements, we have three main theories.
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The first is about the new coolant type.
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And the second is to increase the heat transfer area.
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And the third is about high flow rates.
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But there are some questions.
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First, for the new coolant type, we can talk about nanofruit, we can talk about refrigerants used in some two -phase cooling systems.
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We need to do a long -term compatibility test to use it before we implement it in a real data center.
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Because those liquid cooling servers, that service they they provide, they support is very critical.
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The second is about the surface, is about the area of the heat transfer surface.
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When we're talking about the new structural design of the heat sink, about the cold place, we need to think about the coast.
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That's one part.
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And the second is about the production feasibility.
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Some of the structure is very hard to make it in real world.
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So that's the second.
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And for the high flow rate, a high flow rate will of course cause a very high pressure job.
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It will cause more space used in these data centers.
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So how to make this happen?
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The last is about the AI training, that it's very different to traditional general servers' works.
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Like in different stages of AI training, the GPU load is different.
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So how do our cooling systems can respond to this constantly or frequently vary those.
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That's our question.
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So the deeper we dive into this system, the more questions we find.
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All these considerations are the foundation of the work and the projects that we are working on.
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In China, we have built a joint lab with some of our customers to do some fundamental research.
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And for the component level,
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we have to do our new code plate design performance and the optimization of the structural study.
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And we also do the leak test of the QD when they are operated under some offsets.
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And we also do the research of the manifold uniform distribution and the coolant, the long -term lifetime property.
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And for the system level, we also built our long -term operations test setup to do the test like
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if the flow rate is over 1 .5 meter per second, what will happen?
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What influence it will have on the whole system and the performance of the code plates and the strength of the filter?
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What will be the influence? and for the coolant parts,
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what is the lifetime model of the coolant?
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Because we need to replace the coolant frequently now with like pitch 25 or other kinds of the coolant.
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So how can we make it last longer?
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That's also one of our topic.
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And also we will do some CDU control logic test.
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As we just discussed, the loads of AI training will vary frequently.
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So how can our cooling system respond to it and make a stable flow rate and a stable temperature supply?
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Those are all the topics and projects we are working on.
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And the goal of our company is very simple.
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We want to support reliable, we want to support sustainable solutions to our customers.
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We want to discuss more with our customers, with our partners, to discuss about their requirements,
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to know more about the problem they are facing, and to provide more reliable products and solutions to them.
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And in U .S., we are also building a test platform in our office.
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This platform is composed of four parts.
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The first is the liquid -to -liquid -CDU loop.
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The second is the sidecar solution, and the in -rack solution, and also the fan wall air cooling solutions.
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With this Mooc data center,
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it can give a very clear understanding to our customers who visit it to know what is the liquid cooling solution,
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what is the direct -to -chip liquid cooling solution, and what is the valve configuration,
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and maybe all the operation procedures that will happen in a real data center.
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And that is one of the main features of this platform.
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And the second is about the testing and the research.
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We will use this platform to do some fundamental research.
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Like for the CDU, we will do the thermal test, we will do the control logic test,
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the function test, and also maybe the whole cooling system validation test.
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And we will also use this platform to do some long -term operation.
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So let's look what we have for this industry.
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We want to provide reliable solutions for our customers.
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So we raised the concept of full -chain nuclear cooling.
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We defined the full chain with three strategic pillars.
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full ecosystem integration, full application scenario, and also the full lifecycle management.
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So first is about full ecosystem integration.
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We will collaborate with customers across the entire industry from the
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chief provider to several manufacturers all the way to the end users.
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Like we will discuss about their requirements.
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We will develop these products with them from the rack level, like code place, like QD and manifolds,
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and all the way to the facility level, like the CDU, different types of the CDU, the code source, the coolant,
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the secondary pipes, and even the control system.
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And with this approach, it can also help us to have a better understanding of the entire system system.
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And that is very critical for the reliability,
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because only in that way we can make all the components work together seamlessly.
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And the second level is full application scenarios.
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We have expanded our products line away from the liquid cooling loop itself.
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We developed the products based on all related application scenarios.
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Like for the production line, we have our whole series of the products for all the critical tasks
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that may happen in a liquid cooling server production line.
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Like in the production line of liquid cooling server, they need to do the failing, draining, leak tests, and the flushing,
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and maybe in the last part, the nitrogen injection and the drying.
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We have a whole series of the products for that.
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And the second is the lab test application scenario.
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Some of our server manufacturer customers need to do thermal tests, need to do the flow tests to their liquid cooling server demo.
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So we will, based on their requirements, to develop those specific equipments for the test.
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And the last is for operation in a real data center.
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For the data center operation and maintenance, for the data center commissioning, we have our load banks and the emulators for the cooling system validation.
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And the last level is the full lifecycle management.
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Reliability is not only about the components, it's about the whole lifecycle management.
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So we will design all the products that we share in last pages all the designs are done by ourselves,
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and all the production and manufacturing are in our own factories.
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And for the installation and maintenance,
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we also have our own teams to do all these works to minimize the complexity for our customers.
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So that's the three -fold.
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We call it a three -fold.
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We call it a full -chain nuclear cooling solution.
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In the following parts I will give some detailed introduction
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Of our products
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First is the CDU CDU is the core components
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For this direct -to -chip liquid cooling
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So we provide in -road CDU We provide in -react CDU Also both we have
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Liquid -to -liquid type
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And liquid -to -air type
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For our liquid in -road CDU Based on our This year's project experiences
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we have already delivered multiple models from 300 kilowatts all the way to 2 .5 megawatts.
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And especially for our 2 .5 megawatts CDU, its cooling capacity is based on 4 -degree Celsius ATD,
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and it has a wide flow rate range from 1 % to 100 % with very stable temperature and flow rate support.
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And the second is about our sidecar, it's also the in -row liquid -to -air CDU.
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Our current model can support 100 kilowatts under 15 degrees Celsius ATD, and we also have N plus 1 pumps,
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N plus 1 the power module, and N plus 1 the vents to support concurrent maintenance.
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And in this Q4, we will have our 240 kilowatt sidecar.
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It's about two rack wide.
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Please, you can check our social media.
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We will release in Q4.
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And then it's about our INRAC CDU.
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We have our INRAC Liquid2Air and Liquid2LiquidCDU.
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For our Liquid2AirCDU, this is mainly used in some lab test scenarios.
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Now our standard model is 20 kilowatts, but of course we can customize based on customer's requirements.
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And for our URAC liquid to liquid CDU,
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the most powerful unit that we have now is 160 kV under 4 degree Celsius ATD.
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And it also has N plus 1 POM redundancy, and it can be compatible for all our WRAC.
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So for the manifold and QD, now the most commonly used QD in this industry now is UQD series series,
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and also now we have MQD series.
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Of course, we have our own design for the QDs, like low flow resistance QD and other types of QD.
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If you have interest, you can come to our booth to have a visit.
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And for our manifold, manifold is a high customized product.
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Now, the largest manifold that we have provided is about 800 LPM per rack.
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The secondary pipe is also a highlight product that we provide.
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For the secondary pipes, because this liquid cooling system requires very high cleanliness, so all these pipes are manufactured in modular
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and they are prefabricated in our own factories and shipped to the project site to do the installation.
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And we have modular pipes.
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And in order to decrease the requirements for the manpower and the lead time,
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we also provide this framed piping.
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It integrates the pipes into the supports, and all the integration will be happening in our own factories.
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You only need to do some tiny connections on site.
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It will decrease about 50 to 70 % of the time
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that it requires to do the installation of the whole secondary loop.
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This is our load bank.
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And our load bank is also a modular requirement.
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For our load bank, we provide this for you 20 kilowatts liquid cooling load bank.
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It can be integrated in one rack,
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multiple this modular liquid cooling load bank can be integrated in one rack to reach about 240 kilowatts per rack.
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And we are also looking for a more higher density of
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this liquid cooling load bank for the test of our future rack, like one megawatts or even higher.
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So the last part is about our products for the production line.
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We have discussed with our server manufacturing customers about the typical process during their production of the server.
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Typically, including the leak test, flushing, draining, fading, burning test,
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and also last part is the draining and nitrogen injection.
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We want to introduce our concept of automation to our customers.
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So there is a video introduce this concept.
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We'll be right back.
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Thank you.
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Thank you.
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Thank you.
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Thank you.
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Thank you.
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Oh, So thank you.
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So that's our production testing line for the liquid cooling servers.
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And I will also introduce some of the details of the parameters of the products
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that you have seen in this testing line.
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So, this one, we call it automatic test tools.
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So, in this unit, we have integrated all the tasks that it requires,
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like all the filling and the drying nitrogen injection to this equipment.
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But for customers who will require that all the function parts need to be separated,
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we also have our separated products for those parts like this is the automatic failing tools.
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And so we are all the explorers in this AI era and we are all the explorers in this liquid cooling era.
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We want to have more collaborations with our customers and with our partners to make innovation.
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So I warmly welcome you to our booth at B14 to have a more detailed view of our products.
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Thank you.
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Vocabulary and speaking notes for this lesson
This speaking lesson is built on the video “Envicool Full Chain Liquid Cooling 2GW+ Deployment Case Study presented by Envicool”. The speaker keeps coming back to these words: cooling, liquid, test, solution, customers. This video has 206 sentences and 2480 words to shadow. The speech runs for 23:22. The speaker talks slowly, about 106 words per minute, so there is time to copy every sound. 83% of the words are among the 3,000 most common in English; the rest is worth studying before you start.
Key vocabulary in this video
15 words from the video worth learning, with pronunciation and meaning:
| Word | Pronunciation | Meaning |
|---|---|---|
| liquid noun | /ˈlɪk.wɪd/ | A substance that is flowing, and keeping no shape, such as water; a substance of which the molecules, while not tending to separate from one another like those… |
| rack noun | /ɹæk/ | A series of one or more shelves, stacked one above the other. |
| server noun | /ˈsɝvɚ/ | A program that provides services to other programs or devices, either in the same computer or over a computer network. |
| requirement noun | /ɹɪˈkwaɪɹmənt/ | A necessity or prerequisite; something required or obligatory. Its adpositions are generally of in relation to who or what has given it, on in relation to whom… |
| pipe noun | /ˈpaɪp/ | A wind instrument consisting of a tube, often lined with holes to allow for adjustment in pitch, sounded by blowing into the tube. |
| scenario noun | /sɪˈnɛəɹioʊ/ | An outline or model of an expected or supposed sequence of events. |
| introduce verb | /ˌɪntɹəˈdus/ | To cause (someone) to be acquainted (with someone else). |
| density noun | /ˈdɛn.sə.ti/ | A measure of the mass of matter contained by a unit volume. |
| component noun | /kəmˈpoʊ.nənt/ | A smaller, self-contained part of a larger entity. Often refers to a manufactured object that is part of a larger device. |
| integrate verb | /ˈɪn.tɪ.ɡɹeɪt/ | To include as a constituent part or functionality. |
| modular adjective | /ˈmɑd͡ʒəlɚ/ | Consisting of separate modules; especially where each module performs or fulfills some specified function and could be replaced by a similar module for the… |
| stable noun | /ˈsteɪ.bəl/ | A building, wing or dependency set apart and adapted for lodging and feeding (and training) ungulates, especially horses. |
| loop noun | /luːp/ | A length of thread, line or rope that is doubled over to make an opening. |
| reliable adjective | /ɹɪˈlaɪəbl̩/ | Suitable or fit to be relied on; worthy of dependence, reliance or trust; dependable, trustworthy |
| integration noun | /ˌɪn.tɪˈɡɹeɪ.ʃən/ | The act or process of making whole or entire. |
Phrasal verbs you will hear
| Word | Pronunciation | Meaning |
|---|---|---|
| cool down verb | /kuːl ˈdaʊn/ | To become cooler; to be reduced in temperature. |
| work together verb | To be coworkers with someone; to share a workspace with someone. |
Grammar in this video
The structures the speaker uses most, with the exact words from the video:
| Structure | In the video |
|---|---|
| Present perfect have/has + past participle — a past action that still matters now | have been · have already delivered · have built |
| Passive voice be + past participle — the focus is on what happens, not who does it | are established · is based · are operated |
Pronunciation to watch
The speaker uses 3 contractions and reduced forms, such as I'm, we'll, we're. Say them the short way, as you hear them.
- The “th” sounds: booth /buθ/, thermal /ˈθɜːməl/
- The “sh” and “zh” sounds: integration /ˌɪn.tɪˈɡɹeɪ.ʃən/, installation /ˌɪn.stəˈleɪ.ʃən/, injection /ɪnˈd͡ʒɛk.ʃən/, structural /ˈstɹʌk(t͡)ʃəɹəl/, flush /ˈflʌʃ/
- Long words — get the stress right: integration /ˌɪn.tɪˈɡɹeɪ.ʃən/, installation /ˌɪn.stəˈleɪ.ʃən/, automatic /ˌɔː.təˈmæt.ɪk/, fundamental /ˌfʌn.dəˈmɛn.təl/, manufacturer /ˌmænjʊˈfæktʃəɹə/
How to practise with this video
- Listen to the whole video once without speaking and note the words you do not know.
- Shadow it sentence by sentence at normal speed, repeating each one until your rhythm matches the speaker.
- Record yourself and compare with the original, paying attention to words like liquid, rack, server.
What is the Shadowing Technique?
Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.