Problems:
1. Refrigerator load is too large.
2. Heat is discharged from the water cooler in the rectifying system.
3. Four units of circulating pumps of thermal oil are in the condition of light load operation.
Improvement measures:
1. Increase the heat exchangers of refrigerator precooler to reduce the power consumption of
the compressor.
2. Install more heat exchangers in the rectifying system to reduce the fuel gas consumption of the thermal oil heater.
3. Operate the thermal oil pump and heater, controlling the number of units and the temperature to match the load.

Problems:
1. Six units of compressors are installed independently, and the number of units in operation is left to personal judgment.
2. While high temperature water discharged from dies and molding equipment is cooled in the cooling tower for reuse, supply water is heated in the boiler.

Measures:
1. Combine six compressors to automatically control the number of units in operation.
2. Control the circulating water volume of the cooling tower.
3. Recover the steam flowing out of the dies, and return it to the boilers through condenser, vacuum pump, and strainer.

Effect:
Reduction of power consumption- 24,525kWh/year
Reduction of heavy oil- 648kL/year
Total energy-saving rate- 17.2%