The poster was too anxious, and the punctuation was not standardized. It should be "UPS, what are the roles of the upper and lower ventilation of the air conditioner in the computer room?"
Answer:
UPS: AC uninterruptible power supply, the input and output are AC, and it plays a transformation role by itself, completing an "AC - DC - AC" transformation process. To ensure that the output power is of high quality, stable, reliable and uninterrupted, the battery is used as the backup energy source and the battery is connected to its DC part. The input is divided into single-phase and three-phase, and the output is also divided into single-phase and three-phase. Generally, those with power above 20KVA have three-phase input and three-phase output.
Air conditioning: maintain constant temperature and humidity in the computer room to ensure the cleanliness of the air in the computer room. According to the air supply mode, it is divided into two types: upper air supply and lower air supply. Top air supply is divided into two types: hood air supply and duct air supply. The duct air supply is more precise, while the hood air supply is simpler. The upper air supply is mainly used in the cabling machine room on the cabling rack. The lower air supply must have an anti-static overhead floor. The general overhead height is 30 to 50 cm. What is more advanced is that the computer room refrigeration system is divided into cold and hot aisles and isolated from each other, which can improve thermal efficiency. In addition, heat pipe technology has emerged, which can replace air conditioners to a certain extent.
1. The number of air changes in the oil storage room of the diesel generator room is ≧5 times/h.
2. The number of air changes in the substation room is 5-8 times/h, and the number of air changes in the power distribution room is 3-4 times/h.
3. The number of air changes in the refrigeration machine room is 4-6 times/h.
4. The number of air changes in the oil-fired boiler room and fuel-fired direct-fired engine room is ≧3 times/h, and the number of air changes in accident ventilation is ≧6 times/h.
5. The number of air changes in gas boiler rooms and gas direct-fired machine rooms is ≧6 times/h, and the number of air changes in accident ventilation is ≧12 times/h.
6. The ventilation volume of the oil depot should be ≥6 air changes/h; the ventilation volume of the oil pump room should be ≥12 air changes/h; when calculating the air changes of the two, the room height can generally be 4m;
7. The ventilation volume between underground daily fuel tanks should be ≥3 hours/h.
8. The gas pressure regulating and metering room should be equipped with a continuous exhaust system, and the ventilation volume should be ≥3 air changes/h; the accident ventilation volume should be ≥12 air changes/h.
9. The laundry room can be estimated based on the following air exchange times: the air exchange rate for production rooms is 20 to 30 times/h. When there are local ventilation facilities, the overall exhaust air rate is 5 times/h. The ventilation frequency is 2~3 times/h; the ventilation frequency of auxiliary rooms is 15 times/h; the living rooms shall comply with relevant specifications.
10. Public restrooms should be ventilated 10 to 15 times/h; residential bathrooms and boiling water rooms should be ventilated 5 to 10 times/h; for air-conditioned hotel bathrooms, the exhaust air volume should be based on the fresh air volume in the room. 80%~90%.
11. The smoking room should be equipped with mechanical exhaust, and the exhaust volume should be selected based on 10 to 15 air changes/h.
12. The elevator machine room can use mechanical ventilation or refrigeration (with its own cold source air conditioner) to cool down in summer. The air volume used for ventilation and cooling can be determined by the air change method, which is generally 5 to 15times/h.
13. Darkroom ventilation should adopt mechanical exhaust and natural air intake ventilation methods, and the exhaust volume should be ≥5 air changes/h. The air exhaust outlet should be located near the pool. The air inlet should use blackout blinds, and the wind speed through the blinds should be <2m/s.
14. The number of air changes in underground storage rooms and bicycle garages is 2-4 times/h.
15. Underground garage: Set up a mechanical exhaust system. The exhaust system is set according to the fire protection zone. The exhaust volume is 4 times/h (based on a floor height of 3.0 meters). Use low-noise fans and no noise reduction measures.
16. The underground equipment room is equipped with a mechanical exhaust system. The exhaust volume is: 5 times/h in the water pump room, 8-10 times/h in the substation, and 4 times/h in the weak electrical machine room