1. Hidden leakage: cold air leaks from the space under the raised floor and enters the adjacent space or support column. This kind of leakage is quite common and leads to the pressure loss in the cold channel machine room environment, which makes the hot air or wet air filled with dust enter elsewhere. The way to avoid this problem is to check the surrounding and supporting columns under the raised floor and seal any holes you find.
2. Too many perforated floors: There is no reason to place perforated floors in hot channels and empty areas. This will waste cooling capacity. It is also possible that too many perforated floors are placed at the air inlet of the rack. The temperature at the top of the IT rack is lower than the normal temperature, which is a big danger signal.
3. Unsealed raised floor openings: Although many cold channel data center operators have tried to seal cable openings and other holes in the raised floor, few people have completed this work. The remaining holes will cause a large amount of cold air to escape into the unwanted area. Electrical equipment such as power distribution unit or remote power panel is a particularly important place to find unsealed openings.
4. The sealing of the rack is not good: it is common sense to place the spare panel in the empty cabinet area, but not everyone will do so. Some cabinets are not well designed, and the installation rail and the cabinet edge are sealed. Operators concerned with efficiency will seal those openings and potential openings at the bottom of the cabinet.
5. Inaccurate scale of temperature and humidity sensor: sometimes the supplier uses an uncalibrated sensor, and sometimes the scale will become inaccurate over time. This will cause poorly managed cooling units to not work together. It is recommended that the operator calibrate the temperature and relative humidity sensors every six months and make corresponding adjustments when necessary.
6. Let the CRACs control each other to control humidity: Another good way to make two CRACs control each other is to supply different temperature circulating air to the adjacent CRACs. Therefore, CRAC has different humidity readings, one end humidification, and the other is drying the air. To solve this problem, we need to skillfully understand the humidity chart and accurately set the humidity control point.
7. Thinning is precious: many cold channel data center operators preset excessive cooling capacity. If the cooling capacity is greater than required and the safety of the excess CRACs cannot be guaranteed, the whole cooling scheme will be affected because too many units are in an inefficient state. When the cooling temperature under the floor is very high and some racks are difficult to be cooled, the operator's consistent response is to run more cooling units. However, contrary to intuition, the correct approach should be to run fewer CRACs to reduce the load.
8. Idle Jinan chassis and cabinet space: This is another obvious factor, but for some reason it is not taken seriously by everyone. When one or more cabinet spaces are empty, the air flow balance will be damaged, resulting in exhaust gas circulation into the cold channel, or cold air loss in the cold channel. This situation will lead to excessive cooling and supply more air than is actually required to compensate for the loss.
9. Bad rack layout: ideally, you want to arrange the rack in a row according to heating/cooling, and place the main CRACs at both ends of each row. Having a small rack without a specific direction can't help anyone. It doesn't help to arrange the rack from front to back, or make the direction of CRACs and IT lines the same.
10. Cooling management has not received due attention: the benefits of improving cooling management methods have not been considered, resulting in the stranding of operators' capacity and higher operating costs. You can benefit from doing some simple work, such as installing a spare panel, but they are often ignored.
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