GB/T 40815.2-2021 in English
VALIDMechanical structures for electrical and electronic equipment—Thermal management for cabinets in accordance with inch and metric system—Part 2:Method for the determination of forced air cooling
- Issued on:2021-10-11
- Implemented on:2022-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
| Standard No: | GB/T 40815.2-2021 |
| Document status: | VALID |
| Title in English: | Mechanical structures for electrical and electronic equipment—Thermal management for cabinets in accordance with inch and metric system—Part 2:Method for the determination of forced air cooling |
| Title in Chinese: | 电气和电子设备机械结构 符合英制系列和公制系列机柜的热管理 第2部分：强迫风冷的确定方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-10-11 |
| Implemented on: | 2022-05-01 |
| ICS Classification: | 31.240-Mechanical structures for electronic equipment |
| Chinese Classification: | K05-Electrical product mechanical structure |
| Professional Classification: | GB-National Standard |
| Related Keywords: | preferred air duct forms air volume
forced air cabinet air duct form standard air non-standard air duct |
| Related Topics: | GB/T 40815.2
GB/T 40815.2-2021 electrical and electronic equipment |
《GB/T 40815.2-2021电气和电子设备机械结构 符合英制系列和公制系列机柜的热管理 第2部分：强迫风冷的确定方法》由TC34（全国电工电子设备结构综合标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
GB/T40815.2-2021 is equivalent to the IEC626102:2018 international standard, which stipulates the forced air cooling design method of cabinets that comply with the IEC60297 and IEC60917 series. The standard focuses on:
- Definition of thermal boundary conditions (reference temperature, air volume conditions, standard air)
- Standardized specifications for 6 preferred air duct forms
- Air volume matching principle between cabinet and internal plug-in box/chassis
- Complete forced air cooling evaluation flow chart
Key technical points
1. Thermal boundary conditions
| Parameter | Definition | Measurement requirements |
|---|---|---|
| Reference temperature | Equipment inlet air temperature (initial internal temperature) | Measured 30-50mm from the air inlet |
| Standard air | 1.2kg/m³ density, 20℃, 50% humidity | Complies with fan industry standards |
| Total air volume of equipment∑F3-n | Sum of air volumes of all plug-in boxes/chassis | Needed to be ≤ cabinet air volume F4 |
2. Optimal duct form
The standard defines 6 basic duct forms (see Table 1). Typical examples include:
- F→R: front air intake - rear air outlet
- F+B→T: front + bottom air intake - top air outlet
- F+B→R1+R2: Multi-directional air outlet composite duct
Implementation of the evaluation process
The evaluation flow chart (Figure 5) provided in Chapter 5 of the standard includes 7 key steps:
- Actual thermal performance evaluation of the plug-in box/chassis
- Selection of cabinet duct form
- Verification of equipment layout and duct matching
- Selection of forced air cooling device (must meet ∑F3-n≤F4)
- Verification of the thermal working environment temperature range
- Filter pressure drop compensation calculation
- Confirmation of the overall layout plan of the computer room
Engineering application suggestions
Data center cabinet deployment case
In a closed-channel machine room (Figure 8):
- Preferentially adopt cold and hot channel isolation layout
- The cabinet air duct form should match the air supply direction of the air conditioner
- The deviation between the measured inlet air temperature and the reference temperature should be ≤2℃
Typical problem solutions:When the plug-in box air duct form does not match, the non-standard air duct can be converted to a standard form such as F→R or F+B→T by adding an air guide plate.
Standard Evolution Analysis
This document is the second part of the GB/T40815 series and is completely consistent with IEC626102:2018. Technological development is reflected in:
- Systematization of thermal management requirements for imperial/metric cabinets for the first time
- Introduction of thermal network model (Appendix A) for accurate temperature rise calculation
- Strengthening the concept of thermal collaborative design between cabinet level and equipment level
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