Abstract: In the cost composition of manufacturing enterprises,the energy consumption cost accounts for a large proportion of the total product manufacturing cost. In recent years,with the continuous emergence of new energy-saving technologies,reducing energy consumption in the product manufacturing process has become an effective means for major manufacturing enterprises to reduce manufacturing costs. The chiller is one of the equipment with large energy consumption in the production process of manufacturing enterprises,With different seasons,weather and time periods,the load of the chiller is quite different. Therefore,through the technical transformation of the frequency conversion of the cooling water system of the chiller,the flow of the cooling water is adjusted according to the actual load of the cold water,so that the cooling water always operates at the best temperature,which not only ensures the safe and normal operation of the chiller,but also has an obvious energy-saving consumption effect,especially in spring,autumn and winter,Under the condition of low temperature and small load,the energy saving effect is more obvious,which has obvious economic and social benefits.

Key words: chiller, cooling water, frequency conversion, energy saving