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Centrifugal chiller

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  • Source:顺心彩票
  • Time:2019-08-21 14:36:54
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Details

Centrifugal chiller

The centrifugal chiller uses electricity as the power source. The Freon refrigerant evaporates and absorbs the heat of the brine water in the evaporator for cooling. The vaporized endothermic freon vapor is compressed by the compressor into a high temperature and high pressure gas. After condensation, it becomes a liquid and is throttled into the evaporator through the expansion valve. Thus, 7 ° C - 12 ° C chilled water is prepared for air conditioning at the end of the central air conditioner.

Characteristics

A two-stage refrigerating compressor with a fully inclined aluminum alloy impeller.

Semi-closed motor: cooled by liquid refrigerant, constant temperature and high efficiency.

Working principle: The blade rotates at high speed, and the speed changes to generate pressure, which is a speed compressor.

Less moving parts, low failure rate and high reliability.

The coefficient of performance is high, generally above 6.1. 15%-100% load operation can achieve stepless adjustment, and the energy saving effect is more obvious.

The cooling capacity of centrifugal chillers is mainly caused by water quality: the condenser and evaporator of the unit are heat exchangers. If the heat transfer tube wall is fouled, the cooling capacity of the unit will decrease, but the condenser and evaporator are in the process of designing the manufacturer. It has been considered to be easy to clean, and its cooling capacity has a long decay with the use of time, and the cooling capacity is rarely attenuated.

advanced technology

A combination of a two-stage centrifugal compressor + a spray evaporator.

This design enables the machine to maintain a high energy efficiency ratio at part load and stable operation in complex environments and large load changes, greatly improving the stability and reliability of the unit.

Characteristics

First: the two-stage compression energy efficiency ratio is high.

The operating range is much larger than single-stage compression and it is not easy to enter the surge zone. The cooling efficiency is high, and when the load is reduced, the efficiency attenuation is extremely small. The speed of the compressor impeller is reduced and the wear of the bearing is reduced. Thereby improving the operating life of the unit. Avoid compressor surge problems under low load conditions.

Second: the spray evaporator has much better energy efficiency and maintainability than the full liquid evaporator, and the R134a charge is relatively small.

The refrigerant entering the evaporator is sprayed downward from above the heat exchange tube array. The liquid refrigerant forms a film on the tube wall and flows downward. The refrigerant circulation pump is used as the refrigerant throttling device of the economizer to the evaporator, and the liquid refrigerant at the bottom of the evaporator is extracted and recirculated to increase the supply of the refrigerant above the array in the evaporator, so that all the copper pipes can cover the liquid refrigerant. The unit does not need to accurately correct the level, only for general positioning, the evaporator can play normal and efficient functions.

The unit does not need to be overhauled, only the cleaning of the water system is required, and the maintenance cost is low.

Electric refrigeration has a history of more than 100 years, with mature technology and manufacturing processes, convenient use and maintenance, and has become a popular product for many users.

The average life of the centrifugal compressor is 80,000 hours. The unit freon and oil have been added, and the user can use the water and electricity on site.

note

1. The main control parameters of centrifugal chillers are refrigeration performance coefficient, rated cooling capacity, surge and energy efficiency ratio at partial load, input power and environmental protection of refrigerant type.

2. The selection of the chiller should be considered according to the cooling load and use.

3. When a chiller is selected, the unit with a higher coefficient of performance value is preferred. When the design is selected, it is generally selected according to the large amount of cold that may be required under extreme conditions. According to statistics, the average chiller operating time under 100% load is about 1/4 of the total running time. The operating time ratios of 100%, 75%, 50%, and 25% of the total operating time were approximately 2.3%, 41.5%, 46.1%, and 10.1%. Therefore, when selecting a chiller, priority should be given to models with a flatter efficiency curve. It is recommended to use a two-stage centrifugal compressor + spray evaporator solution. At the same time, the adjustment range of the chiller load should be considered when designing and selecting.

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