Method for repairing leaks in chiller
Because the leakage of the chiller system not only causes the refrigerant to seep or the outside air to infiltrate, affecting the normal operation of the refrigeration device, but also causing economic losses and polluting the environment. Therefore, the tightness of the chiller system is often an important indicator of the quality of the installation or manufacturing of a refrigeration unit. However, due to the large number of welding points and joints in the installation or assembly process of large chiller systems, leakage is inevitable. This requires the commissioning personnel to carefully check the system for leaks and identify and eliminate leaks. System leak detection is the main project in the whole debugging work, and must be carried out with seriousness and patience. The methods for repairing leaks are as follows:
First, pressure leak detection
The chiller refrigeration system pressure leak detection is the most effective way to check and find the leak point. The leak detection pressure in the chiller refrigeration system is related to the type of refrigerant used, the cooling method of the chiller refrigeration system and the position of the pipe section. For high pressure systems, the leak detection pressure is approximately 1.25 times the design condensing pressure; the low pressure system leak detection pressure should be approximately 1.20 times the saturation pressure at summer temperature. In this way, the refrigeration unit prevents refrigerant leakage whether it is running or stopping. For some refrigeration systems, if there is an acceptance or leak detection standard, the leak should be performed at the specified pressure. Obviously, the leak detection pressure cannot be increased arbitrarily, otherwise it may damage the equipment and cause an accident.
Second, vacuum leak detection
After the chiller system has passed the pressure leak test, vacuum leak detection should also be carried out, because some parts may have one-way leakage. Only after the vacuum leak detection and pressure meet the requirements, the unit's sealing performance can be ensured. In addition, the system can also remove water when pumping out, especially the Freon system, which is an important part of the refrigeration system debugging process. The refrigeration system should be evacuated with a vacuum pump, especially the chiller system of a closed compressor, which must be evacuated with a vacuum pump. This not only reduces the system to an extremely low level, removes air and moisture from the system, but also protects the compressor and motor. It must be pointed out that after long-term use of the vacuum pump, the water vapor in the unit may enter the lubricating oil of the vacuum pump, which will affect its evacuation capacity, so the lubricating oil in the vacuum pump needs to be replaced periodically.