The following ____________ options do not belong to the characteristics of direct air-cooled air-conditioning.
unlimited installation distance
The function of the air system is to rationally organize the flow of indoor air, so that the temperature, humidity and cleanliness of the air in the indoor working area can better meet the process requirements and the comfort requirements of the human body.
Use POE When interface, it has two functions of communication and power supply.
The function of the following () parts is to help with oil return.
In the main road mode, when ups The front-end voltage is at 220V±10%When fluctuating,ups The output voltage will also have Larger fluctuations.
Huawei Monitoring System NETECO Supported functions are ____________ .
configuration management, alarm management, access control management, battery monitoring
The increase of cabinet power density will lead to the emergence of local hot spots in the computer room, and row-level air conditioners can solve local problems. The hot spot is too high.
At present, storage batteries are mainly installed in racks and cabinets in data centers.
In the dynamic ring monitoring system, it can be used to store high-definition images and provide large-scale storage media. The equipment used for long-term storage of video recording is ____________ .
network hard disk video recorder NVR
During the implementation process, corrosive operations should be used ____________ .
anti-corrosion liquid goggles, acid and alkali resistant gloves, acid and alkali resistant clothing, chemical resistant shoes
The following are air-cooled row-level air conditioners ____________ .
During the construction process, if there is an object falling or hitting, it should be used ____________ .
safety helmet, anti-smashing shoes
TN-S The three-phase unbalanced current in the low-voltage power distribution system makes the protection line PS Generate voltage to ground.
ACB The actual work of the circuit breaker can reach several thousand amperes, and at the same time, it requires high segmentation capability and thermal stability. ____________
The dynamic environment monitoring system only has a secondary structure.
The role of the safety valve in the battery structure prevents excessive internal pressure from being excessive ____________ exclude.
The condensate of the air conditioner is formed by condensation after the air warning surface cooler cools down.
There are generally two types of variable air volume ventilated floors, one is through an adjustable air valve, and the other is a dedicated ventilated floor plus adjustable fans.
Regarding the description of the data center cooling system, the following ____________ is wrong.
in the cabinet-level, row-level, and room-level cooling, the airflow path of the row-level cooling method is the shortest
In the access control system interface, the functions that can be realized are ____________ .
The parameters that can reflect the energy efficiency and energy use efficiency of the data center are ____________ .
Climbing personnel must be equipped with necessary safety belts that meet the safety requirements, and use them correctly and reasonably according to the use regulations, while being supervised.
The core components of the refrigeration system mainly include ____________ .
evaporator, condenser, compressor, expansion valve
The following ____________ Yes UPS N The advantages of the system.
low hardware configuration cost,ups Working under the design high load condition, the efficiency is the highest, and the reliability is higher than that of the mains
Huawei Monitoring System NetEco Supports the concept of user groups, and implements role-based user group management. A user group is a group of user-level collections with the same operation permissions, and different user groups have different permissions.
In the dynamic environment monitoring system, viewing the detailed alarm information can help locate the source of the alarm.
RER It is used to measure the use of renewable energy in the data center to promote the regeneration of solar, wind, and water energy, and the use of energy with no carbon emissions or very little carbon emissions.
Environmentally friendly refrigerant R410A Refrigeration performance is better than non-refrigerant R22 better.
For only having Modbus The power supply and distribution equipment of the agreement can be passed ____________ Connected to the dynamic loop monitoring system.
In the air conditioning system, the function of the oil and gas separator is to separate the lubricating oil from the compressor exhaust and return the separated lubricating oil to the compressor.