Industrial chiller preparation before starting and selection considerations

Whether you purchase special industrial refrigeration equipment, air-cooled chillers, water-cooled chillers, or screw chillers, low-temperature chillers, you should generally do the following before starting the unit:

1, first check the power is normal. The power supply voltage should not exceed or fall below ±10% of the rated voltage of the unit. Commonly used voltages include 3-phase 380V and single-phase 220V. When the voltage is too low or too high, the chiller cannot be started.

2. The compressor system of the water system carefully inspects the cooling water system and the chilled water system for water and water pressure, and whether the cooling water and chilled water piping systems are unblocked.

3. Check whether the various pressure gauges, thermometers, flow meters, solenoid valves, relays, and energy regulating valves of the chiller unit are intact.

4, check the transmission device, if the belt drive, its various protection devices are completely reliable, all kinds of wrong equipment, protective equipment is complete and effective.

5, check the chiller unit high pressure system, low pressure system of various types of valves, start or run the switch state is correct.

6, check the crankcase lubricants. The oil level should not be lower than the indicated oil level, nor should it be higher than the indicated oil level. If the lubricating oil is not enough, add the same size, type of lubricant.

7. Check whether there is leakage in the industrial chiller refrigerant system and whether the lubricating oil system leaks oil.

8. Check whether the liquid level of the liquid tank is normal and the liquid level should be kept between one-third and two-thirds.

9. Read handover records, install and repair relevant records, reports and drawings.

When choosing an industrial chiller, what issues should be noted? Dechang Machinery explains:

The industrial chiller refrigeration capacity ranges from 8600Kcal/h to 103200Kcal/h, and the compressor power can be from 3KW-30kw. It can be widely used in various industries of industrial refrigeration, and there are a variety of models to choose from. What problems should we pay attention to when selecting industrial chillers? Johnson Machinery Analysis:

1. The selection of an industrial chiller should be based on the cooling load and where it is intended to be used. For a refrigeration system with a low-load operating condition for a long time, it is suitable to choose a multi-head scroll compressor or a screw compressor for easy conditioning and energy saving. This is what we often call a double-head screw chiller. With changes in the load, the chillers automatically determine the number of start-ups and ensure that the open compressor is in the best working condition, thereby effectively saving energy.

2. When selecting industrial chillers, priority is given to units with higher values ​​of performance factors. According to the statistics of the past, normal chillers are operating under 100% load for less than 1/4 of their operating hours throughout the year. The proportions of running time for 100%, 75%, 50%, and 25% load during the sub-run time were approximately 2.3%, 41.5%, 46.1%, and 10.1%. Therefore, priority should be given to chillers with relatively flat efficiency curves when selecting chillers. At the same time, when the design is selected, the adjustment range of the chiller load should be taken into account. The multi-head screw chiller has excellent part load performance, and the screw chiller can be selected according to the actual conditions of the factory.

3. When selecting industrial chillers, they should pay attention to the conditions of nominal conditions. The actual cooling capacity of a chiller is related to the following two points:

1, cold water outlet temperature and flow;

2, the cooling water inlet temperature, flow rate and fouling factor.

4. When selecting an industrial chiller, attention should be paid to the normal working range of this type of industrial chiller, mainly the current limit value of the motor is the current value of the shaft power under the surface condition.

Johnson Machinery Tips: In the design of industrial chillers should pay attention to: Under nominal operating conditions, cold water outlet temperature should not exceed 15 °C, air-cooled units outdoor dry bulb temperature improperly exceed 43 °C. During use, it is necessary to carefully observe and listen to the sounds and abnormalities of the various components of the crew, and to regularly perform maintenance work on the chillers. When the units are not used for a long time, clean the water in the pipelines and cover the units with the objects, etc. Wait.