Industrial refrigeration equipment - chillers, screw chillers, low temperature chillers <industry chillers, chiller selection recommendations: For customers who use supercooled chillers, chiller selection is already a good road, for the requirements of the guidelines It's all clear to heart. For customers who bought the chiller for the first time, they may not know too much about it and do not know how big a chiller to use. So how do we match the chillers that are right for you?
The chiller is a kind of refrigeration equipment that can provide industrial chilled water to various industries to achieve cooling purposes. According to different cooling methods, the chiller can be divided into an air-cooled chiller and a water-cooled chiller, which can control the temperature to 5-35 degrees. Between, and low temperature chiller can control the temperature between 0 ~ -40 degrees. In chiller selection, we need to know exactly how much the inlet water temperature of the chiller is, the temperature of the outlet water, the flow rate, and the size of the water tank. We must also be familiar with the working environment of the chiller, such as how much the ambient temperature is, and the seasonal changes in the ambient temperature. , environmental space, etc.
A quality and cheap chiller is a guarantee of successful engineering design. It also has a long-term impact on the operation of the system:
1. Cooling water flow: It refers to the cooling water circulation flow of the chiller that needs to be supplied when the refrigeration equipment is used.
2, cooling capacity: that is, how much cooling capacity, the more commonly used refrigeration unit has Kcal / h, kw and so on.
3, the water temperature: backwater temperature or return water temperature difference requirements: the water temperature refers to the need for frozen water temperature, return water temperature refers to the cooling water temperature, some cooling requirements more stringent equipment will have cooling water supply temperature requirements.
4, the water pressure: Some need cooling equipment due to the complex internal cooling structure of the device, there is a certain pressure on the cooling water supply requirements, then need to consider the chiller rated water pressure can meet this requirement.
5, the pump head: If it is a one-on-one use, the pump head should not be a problem. If multiple water-cooled chillers are connected in parallel to form a system for multiple cooling applications, the resistance of the piping system must be taken into consideration to calculate how many pump heads need to be deployed.
6, control and regulation requirements: generally refers to the pressure control adjustment and temperature control adjustment.
7. Chiller safety protection function requirements: A. Compressor delay start protector B. High and low voltage protection function C. Reverse (absent) phase protection D. Compressor overload protection E. Freeze protection F. Compressor overheat protection G The compressor frequently starts the protector and abnormal indicator lights and various protection switches.
The evaporator is one of the four components of the refrigeration system and is the ultimate embodiment of the cooling effect and efficiency. Evaporators are generally designed by the chiller manufacturers and users who choose to use them do not have to worry about. However, in order to better maintain the refrigeration system and ensure its efficient operation, the following points should be noted in the use of chiller evaporators:
1. The influence of the liquid level on the evaporation temperature. Because of the influence of the height of the refrigerant liquid column, the evaporation temperature at the bottom of the flooded evaporator is higher than the evaporation temperature at the liquid surface. Different refrigerants at different liquid surface evaporation temperatures are affected differently by the height of the hydrostatic liquid. Regardless of the type of refrigerant, the lower the evaporation temperature of the liquid surface, the greater the influence of the height of the liquid on the evaporation temperature. Therefore, the effect of the hydrostatic height on the evaporation temperature can be ignored only when the evaporation pressure is high. When the evaporation temperature is low, it cannot be ignored. That is, using a flooded evaporator at this time becomes uneconomical.
2. The possibility of freezing of the brine. If the evaporation temperature is lower than the solidification temperature of the brine, the brine may freeze. In the last flow of the refrigerant, the temperature of the refrigerant is the lowest at which the freezing is most likely. When water is used as the refrigerant, the temperature of the inner wall of the tube can theoretically be as low as 0°C. However, for the sake of safety, the temperature of the inner wall of the tube at the outlet of the last process is usually maintained at 0.5°C or higher. In the case where brine is used as a refrigerant, according to the same principle, the temperature of the inner wall of the pipe should be higher than the solidification temperature of the brine by more than 1°C.
3. Pressure loss of the refrigerant in the evaporator. The pressure loss caused by the refrigerant flowing through the evaporator will inevitably cause the pressure p2 of the refrigerant at the outlet of the evaporator to be lower than the pressure p1 at the inlet, thereby reducing the suction pressure of the compressor, resulting in a decrease in the cooling capacity.
Johnson Machinery Tips: Tank chiller water tank coil evaporator, open chiller and screw chiller is the choice of shell and tube evaporator, anti-corrosion chiller choose titanium tube evaporator or stainless steel plate exchanger. Different chiller models have different evaporators, but they can also be customized according to customer requirements.
News of Refrigeration News can refer to "R290 New Refrigerant Products - Low Carbon Environmental Protection"