Cooling source of central air-conditioning system and cooperation with terminal equipment
Cooling source of central air-conditioning system and cooperation with terminal equipment
The chiller is a widely used cold source in the central air conditioner. There are two chillers, one uses the other...
Text label: central air conditioning system, terminal equipment, clean room design and installation
Cooling source of central air-conditioning system and cooperation with terminal equipment
The chiller is a widely used cold source in the central air conditioner. If there are two chillers, one will be used and one will be backed up; if there are three chillers, two will be used and one will be backed up; if there are four chillers in the refrigeration station, three will be used and one ready; The drive of the water pump is transported to the end equipment of the remote air conditioning system. The air-conditioning chilled water supply temperature is 5-9°C, generally 7°C, and the temperature difference between the air-conditioning chilled water supply and return water is 5-10°C, generally 5°C; the water divider aggregates the chilled water provided by different chillers in the refrigeration station To the water distributor, the water distributor provides the cold source to the air-conditioning terminal equipment distributed in different positions through the branch pipeline. The temperature of the chilled water at the end of the air conditioner is 7°C, the design temperature of the return water is 12°C, and it flows back to the water collector. Since the temperature of the chilled water return water has increased, it is higher than 7°C by a value, but does not exceed 5°C , but also flow back to the chiller to continue cooling.
The condenser in the chiller produces a large amount of heat during operation. The heat is taken away by the cooling water circulation and dissipated into the space through the cooling tower. After absorbing heat from the condenser, the cooling water heats up and passes through the cooling water inlet pipe. It is injected into the cooling tower space, and the cooling tower fan blows the injected cooling water into smaller droplets. When the small droplets fall into the bottom of the cooling tower, they exchange heat with the surrounding air, and then the cooling water outlet pipe after the temperature drops. Flow back to the chiller to continue the cooling cycle described above. In order to overcome the obstacles of damping and water potential energy encountered in the flow of cooling water, a cooling water pump can be used. In the system structure of the refrigeration station, the cooling water pump is connected to the water outlet side of the cooling tower. The central air-conditioning system is a centralized or semi-centralized air-conditioning system, which usually provides low-temperature chilled water from a cold source. The chilled water flows into the cold water coil of the air-conditioning unit. The cold water coil is embedded in the metal surface cooler, on the metal surface cooler. There are many fine holes, when the fresh air from the fresh air outlet and the return air from the return air outlet are mixed in the mixing chamber, and then pass through the fine holes of the surface cooler, the temperature is lowered, and the cold air with suitable temperature and humidity is sent from the air outlet; The cold air generated by the air-conditioning unit is sent to each air-conditioning room through the air supply duct, and the return air of each air-conditioning room gathers the return air in the return air duct and circulates back to the air-conditioning unit. The heat exchange occurs in the room, and the cold energy is transported to the air-conditioning area, the temperature rises, and it returns to the air-conditioning unit to continue the cooling treatment, and the humidity treatment is carried out at the same time, and the above cycle process is continued. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and purification workshops.
In order to ensure the normal operation of the chiller and the safety of the system, through programming, the operation is strictly in accordance with the requirements of the start-stop process of each equipment, and the start and stop of the chiller and the start-stop control of auxiliary equipment must meet the logical interlock of the process requirements relationship; the chiller linkage start sequence: cooling tower fan → cooling tower electric butterfly valve → condenser of refrigerator → electric butterfly valve → cooling water pump → chilled water evaporator → electric butterfly valve → chilled water pump → chiller start. The stop sequence of the chiller linkage is as follows: the chiller stops → the chilled water pump stops → the cooling water pump stops → the cooling tower fan stops. The start-up and shutdown process of the chiller is just the opposite. The chiller has a self-locking protection function. The chiller monitors the water flow status of the cooling water and chilled water circuits through the water flow switch. If it is normal, the self-locking is released, allowing the chiller to start and stop normally. The chiller is equipped with an automatic protection device. When the flow rate is too small, it will automatically stop running. One side of the chiller runs in a constant flow mode. However, for the end of the air conditioning system, the flow can be adjusted by adjusting the regulating valve, so that the water on the load side of the end of the air conditioning system can be adjusted. The flow changes; a bypass is set between the chilled water supply and return water mains. When the terminal flow changes, the bypass flow is adjusted to offset the impact of the change in the terminal flow on the chilled water flow on the chiller side.
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