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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 Screw Chiller Continue To Improve
- Aug 01, 2017 -

Screw chillers due to the simple mechanical structure, Water Cooled Screw Chiller easy maintenance, relatively low prices and maintenance costs and relatively stable operating conditions, the current market in the small cold tons of exclusive first, by the majority of users and designers of all ages.

 But with the expansion of market share, Water Cooled Screw Chiller customer demand continues to improve, the market appeared on the multi-head screw chiller. Due to the lack of in-depth understanding of the air conditioning market, many users even part of the refrigeration and air conditioning industry personnel, the single-head unit and multi-head unit lack of necessary understanding, Water Cooled Screw Chiller often asked about the single-head unit and multi-head unit of the merits and demerits.

Multi-head chillers can impress the user's surface is a multi-head chillers in the system to reduce the load to a certain extent, can reduce the operation of some compressors (multi-head is more than one screw compressor module combination, when the water temperature drop To the approximate interval, Water Cooled Screw Chiller according to the proportion of the effluent temperature integral operation, Water Cooled Screw Chiller will close the module combination running for a long time, the number of starts more than the compressor).

This is a compressor, is 60% to 100% of the air conditioning system load to run, Water Cooled Screw Chiller so that the purpose of achieving energy conservation. It is worth noting that the efficiency of one (or more) compressors is discussed here, not the efficiency of the chiller. In accordance with conventional ideas, the compressor and the motor the best efficiency should be about 50% to 90%. When the compressor and the motor in less than 50% of the case when the efficiency of a sharp decline. Single head chillers load changes, Water Cooled Screw Chiller adjust a wide range, according to the actual load changes, single head chillers can change, you can save part of the power consumption.

 When the cooling load is between 60% and 80%, the unit condenser and evaporator increase the heat transfer margin, which increases the relative heat transfer area of the condenser and evaporator, and the relative heat dissipation area of the cooling tower increases. Reducing the refrigerant and chilled water, air and cooling water heat transfer temperature difference, so that the unit's condensation temperature decreased, the evaporation temperature increases, thereby improving the efficiency of the unit and reduce user use costs. Water Cooled Screw Chiller When the unit 60% of the cold load when the most power, the unit cold tons of power consumption of 0. 6 kW / ton, this time the unit energy efficiency ratio of 5.80.

For multi-head chillers, each refrigeration system is usually independent of each compressor, it is difficult to use the entire unit of the condenser and evaporator area. For example, a unit with two compressor heads, when the load of the entire air conditioning system drops to 50%,Water Cooled Screw Chiller shuts down a compressor and allows only one of the compressors to operate, at which time the compressor is running Off the side of the condenser and the area of the evaporator. The operating compressor is actually running at full load, which will result in a decrease in the partial load efficiency of the multi-head unit.

The more the operating parts of the unit, Water Cooled Screw Chiller the worse the reliability of the unit. Because at the same technical level, the failure rate of the unit and the components of the unit, the control system is proportional to the number of control objects. The single head unit is equipped with a set of refrigeration system and a single control element. The control object is small and the control accuracy is high. Therefore, the reliability of the unit is high and the service life is long. Multi-head unit, the configuration of multiple compressors, a set of controllers to control multiple control components, due to complex system, many devices, Water Cooled Screw Chiller so the reliability of the unit is relatively low, relatively short service life. Based on this situation, some manufacturers to improve the design method, so that each head can be relatively independent operation, Water Cooled Screw Chiller reduce the failure of a single system on the whole machine

When the single head chillers can not meet your cooling capacity, the chiller manufacturers will recommend you use double head or multi-head chillers. Water Cooled Screw Chiller But also can adjust the energy of the chiller, but in the regulation of chillers, should pay attention to each other.

1, only one compressor chiller: in the heating process, when the display temperature ≥ set temperature + temperature automatically start the compressor; in the cooling process, Water Cooled Screw Chiller when the display temperature <set temperature + temperature automatically stop the compressor The

2, there are two compressors of the chiller: in the heating process, when the display temperature> set the temperature automatically start a compressor, Water Cooled Screw Chiller when the display temperature ≥ set temperature + temperature difference automatically start two compressors, in the cooling In the process, when the display temperature <set temperature, automatically stop one, when the display temperature <set temperature - temperature difference when the full stop.