Energy saving effect analysis of frequency conversion glycol pump of series upstream-cooler ice-storage systems

Analyses the difference between glycol pump frequency conversion and chilled water pump frequency conversion, and calculates the annual operating cost of the ice-storage system with frequency conversion glycol pump or power frequency pump of an office building in Beijing, respectively. The results show that the annual electricity consumption of the frequency conversion glycol pump is less than that of power frequency pump by 21.7%, but the control system is more complex. The system combining frequency conversion glycol pump with refrigerating machine bypass can achieve better energy saving effects, especially for large volume district cooling projects with stage construction.