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Schlee (China) Refrigerating Equipment Manufacturing Co.,Ltd

Add:Jupu Road, Pukou Development Zone, Nanjing City, Jiangsu Province, China

Contact us:Annie





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Water Cooled Chiller Increasing
- Aug 08, 2017 -

The construction scale of data center is increasing, Water Cooled Chiller the refrigeration solution of large-scale chiller is used, although the system is complex, the energy efficiency is high and the effect of energy saving is obvious. Data center based on its own application characteristics, the centrifugal chillers have higher requirements, such as the requirements of more stable and reliable units, Water Cooled Chiller energy saving, to avoid surging, fast restart and so on. The variable-frequency centrifugal chillers fit the application requirements of the data center, and are already widely used in the data center industry.

For the data center, short time cooling and interruption will not only cause a lot of indoor heat accumulation, the temperature is rising rapidly, but also will lead to the IT equipment performance reduction, service life shortened a series of more serious consequences. Water Cooled Chiller Therefore, in order to deal with the extreme situations of short power outage or power switching, the data center usually requires the chillers to be restarted and loaded in the shortest possible time.

Variable-frequency chillers do not have the start time interval limit, Water Cooled Chiller the unit can be restarted frequently, the unit in the case of rapid start-up with UPS, Water Cooled Chiller can be achieved within 1 minutes restart, 2 minutes to reach 80% load output, fixed-frequency unit is difficult to achieve.

Surge is mainly due to condensation pressure and evaporation pressure differential pressure is too high or compressor refrigerant flow too low. When the fixed frequency unit is running at low load, Water Cooled Chiller it can only choose to adjust the opening degree of the diversion vane, and it is easy to catch the surge phenomenon. When the variable frequency unit is running at low load, while adjusting the opening of the diversion vane and the speed of the motor and adjusting the running state of the unit, Water Cooled Chiller the centrifugal unit can be controlled to avoid the surge point quickly, avoiding the damage of the surge to the unit and ensuring the safety of the unit operation.

Inverter units also have other advantages, such as partial load operation noise reduction, improve unit power factor, reduce the standby generator capacity, if the configuration of airborne start-up cabinets can also save floor space.

But at the same time, frequency converter units will also be the communication and data center distribution network to generate higher harmonics. High-order harmonics not only cause the equipment itself and the power grid considerable additional reactive power, Water Cooled Chiller and will interfere with the communication system, serious situation will cause the system to panic, control abnormal downtime, or even loss of real-time data, affecting the normal operation of equipment and shorten the service life. Therefore, it is required to configure the filter for the water chiller's airborne frequency conversion device. Especially IT equipment and inverter under the same transformer, Water Cooled Chiller the active filter should be configured.

With the extensive use of centrifugal chillers in large data centers, the frequency conversion technology has become more mature and popular. But the majority of inverter units for the Single-stage compressor group, we also look forward to the multi-level compression and frequency conversion technology organic combination, Water Cooled Chiller through more cases to see how the effect

Chiller Refrigeration piping Accessories mainly include a variety of valves and connectors. According to the refrigeration system, the water chillers are different from the requirements of the piping accessories. If the cooling pipe accessory material is wrong, or the installation does not meet the requirements, Water Cooled Chiller it will directly affect the refrigeration effect of the chiller.

Ammonia system water chiller pipeline mainly uses welding, and tube wall thickness is less than 4mm with gas welding, 4mm above the use of welding, necessary place can also be used flange connection, single should bring concave and convex mouth; Elbows are all used to simmer; the valve and the pipe wire buckle connection must not use the white oil hemp silk, should use pure pure glycerin and the yellow powder to reconcile the packing, Water Cooled Chiller the branch tube and the collection tube box connect, Water Cooled Chiller the branch pipe should open the curved fork mouth and sets Yu Ping connection, lest causes the fluid to be uneven