Low Temperature Chiller

A low temperature chiller unit, like other types of chiller units, works on the principle of refrigeration to remove heat from a process or environment and maintain a specific temperature. However, the unique feature of a low temperature chiller unit is its ability to maintain extremely low temperatures with high precision.

The working principle of a low temperature chiller unit begins with a compressor that circulates a refrigerant through a closed loop system. As the refrigerant flows through the compressor, it is compressed and its temperature rises. The hot, compressed refrigerant is then passed through a condenser, where it is cooled and condensed into a liquid state.

From the condenser, the liquid refrigerant is passed through an expansion valve or throttle valve, which reduces its pressure and causes it to expand rapidly. This expansion causes the refrigerant to cool significantly, and it becomes a low-pressure gas as it enters the evaporator.

The evaporator is the part of the chiller unit that comes into direct contact with the process or environment that requires cooling. As the low-pressure refrigerant gas passes through the evaporator, it absorbs heat from the process or environment, causing it to cool down. The now-warmed refrigerant gas is then returned to the compressor to begin the cycle again.

To maintain precise low temperatures, a low temperature chiller unit may use additional components such as a refrigerant sub-cooling system, which cools the refrigerant below its condensing temperature before it enters the evaporator. This allows the chiller to maintain consistent low temperatures even in environments with high heat loads or fluctuations.

Inspection of low temperature chiller
Before using the low-temperature chiller, it is necessary to troubleshoot and overhaul the whole machine.

First of all, it is necessary to check whether the power switch is normal, whether the safety of the fuse is good, and whether the connection of other parts of the chiller is normal, so as to ensure everything is normal before starting to operate.

Secondly, after the use of the chiller, also want to carry out a certain inspection, to see if there is because of the use of the fault, found that should be handled in a timely manner.

In addition, after a long period of use, the low-temperature chillers should regularly check the use of the heater copper pipe, refrigerating oil, oil filter element, drying filter and other components. In case of any damage, they should be replaced in time.

Maintenance of low temperature chiller
Antifreeze
When the ambient temperature is below zero and the chiller is out of service, the concentration and density of the refrigerant inside the evaporator should be checked to prevent freezing. The cooling water system can run the cooling pump for 24 hours or drain the cooling water.

Maintenance of electronic control system
Now we use mostly intelligent electric refrigeration equipment, electronic control system of intelligent controller (plc and single-chip microcomputer), control panel, ac contactor and other electrical components. In a year the stopping down inside there will be a lot of dust when breaking the total power clean out all the electrical components, clean up before the power on, to prevent battery drain and program loss in the controller.

Routine maintenance of the unit
General water cooling cold water chiller use one to two years to do a routine maintenance (including the replacement of frozen oil oil filter drying filter element) to ensure that the use of the unit more stable and efficient.

Clean condenser and cooling tower
Condenser and cooling tower is a circulation system, usually the cooling tower is an open cycle, heat exchange with the air for a long time there will be a lot of dust and silt in the cooling tower packing and cooling water when the unit is out of use should be cleaned the cooling tower packing, basic plate and condenser line.