Industrial refrigeration equipment-Chiller, screw chiller. Low-temperature chiller<Industrial chiller, chiller selection of the point of the proposed: For the use of chillers customers, the chiller selection is already a rare way, for the requirements of the guidelines are clear heart. And for the first time to buy chiller customers, may not be too understanding, they do not know how to use chillers. So how do we choose the most suitable chiller units?
Chillers can be provided to the industry to the industry with chilled water, in order to achieve the purpose of cooling a cooling equipment, according to the different heat can be divided into air-cooled chiller, water-cooled chiller, it can control the temperature in the 5-35 degrees , While the low-temperature chiller can control the temperature between 0 ~ -40 degrees. In the selection of chiller, we have to accurately understand the chiller water temperature how much water temperature, how much traffic, how much water tank, but also on the working environment of the chiller, such as the ambient temperature, the ambient temperature of the seasonal changes , Environmental space and so on.
A high quality and cheap chillers, but also the success of engineering design guarantee, while the system also has a long-term impact:
1, cooling water flow: refers to the use of refrigeration equipment to be used when the cooling water supply cooling water flow.
2, cooling capacity: that is, how much cooling capacity, the more commonly used units of cooling Kcal / h, kw and so on.
3, the water temperature: return water temperature or return water temperature requirements: water temperature is the need for chilled water temperature, return water temperature refers to the cooling water temperature, some cooling requirements of the more stringent equipment will have cooling water supply temperature requirements.
4, the water pressure: some cooling equipment due to its internal cooling structure of the complex structure of the cooling water supply a certain pressure requirements, then consider the chiller rated water pressure can meet the requirements.
5, the pump head: If it is a one-on-one use, pump head should not be a problem. If more than one water-cooled chiller into the system for multiple cooling equipment applications, you need to consider the resistance of the pipeline system, which to calculate the need to configure the number of head of the pump.
6, control regulation requirements: generally refers to the pressure control adjustment and temperature control adjustment.
7, chiller safety function requirements: A. compressor delay start protector B. high and low voltage protection function C. reverse (lack) phase protection D. compressor overload protection E. anti-freeze protection F. compressor overheat protection G Compressors frequently activate protector and abnormal indicator lights and various protection switches.
Evaporator is one of the four components of the refrigeration system, is the ultimate embodiment of the cooling effect and efficiency. Evaporator is generally chiller manufacturer design, matching a good user do not have to worry about. But in order to better maintain the refrigeration system to ensure its efficient operation, the use of chiller evaporator should pay attention to the following points:
1. Effect of liquid level on evaporation temperature. Due to the influence of the height of the refrigerant column, the evaporation temperature at the bottom of the full-liquid evaporator is higher than the evaporation temperature of the liquid level. Different refrigerants, different temperatures in the evaporation temperature are affected by the height of the hydrostatic. Whichever type of refrigerant, the lower the evaporation temperature of the liquid level, the greater the effect of the hydrostatic height on the evaporation temperature. Therefore, the effect of the hydrostatic height on the evaporation temperature can be neglected only when the evaporation pressure is high. When the evaporation temperature is low, it can not be ignored. In other words, the use of full-liquid evaporator at this time becomes uneconomical.
2. The possibility of cold refrigerant freezing. If the evaporation temperature is lower than the solidification temperature of the refrigerant, the refrigerant has the possibility of freezing. In the last flow of the refrigerant, the lowest temperature of the refrigerant is most likely to freeze, and when the water is used as the refrigerant, the temperature of the inner wall of the tube can be as low as 0 ° C. For the sake of safety, however, the temperature of the inner wall of the tube at the end of the last process is maintained above 0.5 ° C. In the case of the salt water as the refrigerant, the wall temperature of the tube should be higher than the solidification temperature of the refrigerant by 1 ° C or higher according to the same principle.
3. The pressure loss of the refrigerant in the evaporator. The pressure p2 of the refrigerant at the outlet of the evaporator is lower than the pressure p1 at the inlet, thereby reducing the suction pressure of the compressor, resulting in a decrease in the cooling capacity when the refrigerant flows through the evaporator.
Cumond engineer remind all: box-type chiller using water tank coil evaporator, open chiller and screw chiller is the use of shell and tube evaporator, anti-corrosion chillers choose titanium tube evaporator or stainless steel plate exchanger. Chiller different evaporator models are different, can also be customized according to customer requirements.