1. Know the precision air conditioner: The precision air conditioner can control the temperature and relative humidity to plus or minus 1 degree Celsius, which greatly improves the life and reliability of the equipment. For many people who know the precision air conditioner for the first time, the precision air conditioner is very mysterious. What is the difference between ordinary air conditioners and ordinary air conditioners? The difference, this article will explain in detail the principle composition and failure of the precision air conditioner in the computer room. 2. Working principle of precision air conditioning The compressor sucks refrigerant vapor, compresses it into high-pressure and high-temperature steam, and then discharges it into the condenser. In the condenser, it releases heat to the cooling medium (water or air), condenses into high-pressure liquid, and throttles to low-pressure and low-temperature refrigeration through a throttle valve. The agent enters the evaporator again to absorb heat and vaporize, so as to achieve the purpose of circulating refrigeration.
The following table is the approximate cooling load index, after calculating the approximate cooling capacity, to ensure a reasonable cooling capacity. 4. Classification of precision air conditioners: According to the air outlet method, it can be divided into: upper outlet air, lower return air, lower outlet air, upper return air, upper outlet air, side return air. Divided into cooling methods: air-cooled air conditioning and water-cooled air conditioning. The difference between precision air conditioning and ordinary air conditioning Water-cooled air conditioners are divided into: chilled water cooling and cooling water cooling. 5. The main components of precision air conditioning: Air duct system: motor, fan, air filter, air volume adjustment. Humidification device: infrared humidification (high-intensity quartz lamp, stainless steel reflector, stainless steel evaporating water tray, temperature overheat protector, water inlet solenoid valve, manual valve, humidification water level controller) electrode boiler humidification (electrode boiler, steam spray tube , Inlet solenoid valve, drain solenoid valve, water level controller). Refrigeration system: compressor, evaporator, condenser, expansion valve. In addition, there are auxiliary parts: liquid storage tank, one-way valve, sight glass, fan speed governor, high and low pressure detection switch, drying filter, pipeline solenoid valve, etc. 6. Convenient calculation method for cooling capacity of precision air conditioner: Method 1: Power and area method: Qt=Q1+Q2 Q1 Indoor equipment load (= equipment power X0.8) Q2 environmental heat load (=0.18KW/㎡; X machine room area) Method 2: Area method (when only the area is known): Qt=S x p Qt total cooling capacity (kw) S Machine room area (㎡;) P Cooling capacity estimation index Equipment room equipment load: 500 servers, equipment room requires a total design power of 60KW, and equipment room area: 70㎡; calculated by power and area method, the formula is as follows: Qt=Q1+Q2 Qt = total cooling capacity (KW) Q1 = indoor equipment load (= equipment power 60KW) Q2=Environmental heat load (=0.15KW/㎡; machine room area) Qt=60KW+ (0.15KW/㎡; 70㎡)=60KW+10.5KW=70.5KW Suggested use: Two sets of equipment with a sensible cooling capacity of 35 KW, run at the same time, or use three sets, one for both uses. The following table is the approximate cooling load index, after calculating the approximate cooling capacity, to ensure a reasonable cooling capacity. Computer room equipment load: 500 servers, computer room requires a total design power of 60KW, computer room area: 70㎡; calculated by power and area method, the formula is as follows: Qt=Total cooling capacity (KW) Q1 = indoor equipment load (= equipment power 60KW) Q2=Environmental heat load (=0.15KW/㎡; machine room area) Qt=60KW+ (0.15KW/㎡; 70㎡)=60KW+10.5KW=70.5KW Suggested use: Two sets of equipment with a sensible cooling capacity of 35 KW, run at the same time, or use three sets, one for both uses.
