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学习笔记:主流液冷方案的对比分析

  • 2026-02-05 10:05:24
学习笔记:主流液冷方案的对比分析
大家好,我是老张
前几天听了淼算科技-液冷专家赵总线上的“液冷技术讲解”,对于主流液冷方案有了更全面的了解,今天和大家简单做个分享,比如同样是一台4090八卡服务器用风冷、冷板及浸没对于耗电量的不同,液冷两种主流方案“冷板”和“浸没式”相比各自的优缺点,冷板&浸没方案中冷却液有哪几种优缺点如何?等等
一、4090八卡机不同散热方案下的耗电量对比
下面是目前市场主流的4090八卡机的配置,可以看到设备包括了2颗至强第五代CPU、512G DDR5的内存、1块系统盘、一块加速盘、4块2700W冗余电源以及8张4090的GPU卡;
我们按照粗略估算,单台设备风冷的情况下整机最高功耗约为4.6kw;冷板的散热方案下最高功耗约为4.2kw,浸没式方案的最高功耗约为4.0kw;
我们按照1000台的规模,满负荷运行5年,电费按照7毛一度电算,5年累计可节省约1800万的电费,计算方式如下:

1、风冷‌版的4090八卡机五年电费计算方式如下:

1年耗电量‌:4.6 kW × 24 小时/天 × 365 天/年 = 40,176 kWh

‌五年总耗电量‌:40,176 kWh/年 × 5 年 = ‌200,880 kWh‌

4.6 kW设备满负荷运行五年,总耗电量为200,880度电‌。

总电费=200,880x0.7≈1.41亿;
2、冷板的4090八卡机五年电费计算方式如下:

‌1年耗电量‌:4.2 kW × 24小时/天 × 365天/年 = 36,792kWh

‌五年总耗电量‌:36,792kWh‌/年 × 5年 = ‌183,960kWh‌

4.2kw设备满负荷运行五年,总耗电量约为‌183,960度电‌。

总电费=183,960x0.7≈1.29亿;
3、浸没的4090八卡机五年电费计算方式如下:

‌1年耗电量‌:4 kW × 24 小时/天 × 365 天/年 = 35,040 kWh

‌五年总耗电量‌:35,040 kWh/年 × 5 年 = 175,200 kWh

4kw设备满负荷运行五年,总耗电量约为‌175,200度电‌。

总电费=175,200x0.7≈1.23亿;
二、“冷板”和“浸没式”相比各自的优缺点
简单分析一下主流GPU服务器的散热方式,风冷方案可类别为天热吹电扇,冷板方案则可类比为通过退热贴的方式带走热量,而浸没式类比为直接用浴缸泡澡,虽然都能解决散热但是效率有所不同;
液冷方案中冷板和浸没目前市场比较成熟且应用比较广泛,两种方案各自的优缺点如何呢?分析如下
综合对比
冷板式
浸没式
市占比,冷板高于浸没式
6-7成
3-4成
IT设备改造
改造更平滑,聚焦CPU、GPU芯片上,需风冷辅助
改造比冷板大,主要是考虑前IO的设计以及去掉所有风扇、空前盘等,100%全液冷散热
冷却液方面
主流水基溶液,不绝缘,有泄漏风险
冷却液完全绝缘,无泄漏风险
维护性
配套的管道更多,结构相对复杂,接头多
相对简单
解耦性
玩家多,选择多,但是以整机厂商的整机柜为主
市场玩家少,标准化不足
市场应用范围
以NV的产品为例应用广泛
但可靠性更高,更多头部大厂开始尝试浸没
冷源方面
冷却液流量小,要求进液的温度低,无法全年依赖自然冷源
冷却液流量大,进液温度高,可全年利用自然冷源
1、冷板式冷却液方面
主流的有去离子水、乙二醇、丙二醇和氟化液(支持相变),分析如下:
2、浸没式冷却液方面:

浸没液冷所用冷却液主要分为碳氢油类和氟化液,其中碳氢油类优点为密度小、难挥发、无环保压力、价格实惠,缺点为不挥发,因此特殊情况(如资产变卖)下需要进行清洗(运维时不需要进行清洗)。

氟化液优点为无需清洗,阿里、字节等大厂验证项目多。

主要指标有燃点、闪点、倾点、运动粘度、比热容、导电率、介电常数、电阻率等等,下图是以水为参照,把主流的油类和氟化液方案做了对比;
三、全球液冷市场的区域分布、液冷布局和供应链情况
下图源自零氪1+1,仅供大家参考
可以看到全球液冷市场依然是北美地区占比大,起步早,主要玩家有openAI、Meta、微软、亚马逊这类AI公司、IT公司占主导,采用冷板方案为主,国内市场占全球份额约10%,主要玩家是头部互联网大厂和运营商,26年国内预计液冷将会迎来爆发,在全球的占比会提升。
---正文完;
最近(2.6-2.8共三天)老张受邀作为讲师之一去参与一个“液冷智算中心”主题的培训,其中的两个章节(对应下图中的前两章)是我讲,后面章节是淼算科技的赵总讲解(他在液冷领域非常资深,有多年的实战经验),对课程感兴趣的可以加我vx17603229978咨询;
另外,4月份老张受邀作为嘉宾之一,参加一个液冷峰会活动的主题演讲,活动很有影响力,做液冷相关领域的朋友可以了解一下!

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  1. CONNECT:[ UseTime:0.000750s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001059s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000922s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003819s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001018s ]
  6. SELECT * FROM `set` [ RunTime:0.002749s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001181s ]
  8. SELECT * FROM `article` WHERE `id` = 464816 LIMIT 1 [ RunTime:0.013954s ]
  9. UPDATE `article` SET `lasttime` = 1770285905 WHERE `id` = 464816 [ RunTime:0.014125s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.006923s ]
  11. SELECT * FROM `article` WHERE `id` < 464816 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010312s ]
  12. SELECT * FROM `article` WHERE `id` > 464816 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009193s ]
  13. SELECT * FROM `article` WHERE `id` < 464816 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.028559s ]
  14. SELECT * FROM `article` WHERE `id` < 464816 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.019719s ]
  15. SELECT * FROM `article` WHERE `id` < 464816 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010054s ]
0.286403s