by Sadayoshi TAKAHASHI, Takanori NAKAMURA, & Shinya ISHIHARA
A chilled water feed system, operable under large temperature differences and equipped with our newly developed high-efficiency, inverter-driven, centrifugal refrigerating machine, has been delivered to a gold ore mine. This system was designed to handle a 20℃ temperature difference at system inlet (25℃) and outlet (5℃), and a refrigeration machine temperature difference of 12℃. This setup enables a refrigeration machine COP = 6.3 and system COP = 5.05. Under maximum load during the field test, a COP of 5.76 was attained. The chilled water temperature can also be controlled to minimize environmental impact in the mine. This system makes full use of the high-efficiency, inverter-driven, centrifugal refrigeration characteristics and is capable of reducing CO2 emission during partial load and load fluctuation conditions.
Keywords
High-efficiency, Centrifugal refrigerating machine, Chilled water feed system operable under large temperature differences, Hishikari Mine, In-mine reduction of environmental inpact, Pump electric power reduction, Coefficient of performance, System efficiency, Partial load, CO2 reduction