The CQM (Automatic Heat Exchangers Cleaning System) was finally mounted on refrigerated water compressor 3#, in May 27, 2004, for the refrigerator room of Haizhu Square Subway Station in Guangzhou, and had been put into operation in May 28, the same year. Up till now, namely, August 18, 2004, it has served in safe operation for 80 days, during which the CQM has reached desired result.
1. Solution has been eventually found for clogging of condenser by silt from Zhujiang River.
Ever from the first day of operation, the temperature difference of heat transfer in condensers has been increasing quite slowly. Until now, the
temperature difference is still kept at 2.1oC (condenser 1#) and 2.30C (condenser 2#), about which, however, apparent temperature rises still exist
in two phases.
- During the first month of operation, inlet valve has always been opened
by 1/3 to activate water pump 3#, due to the relatively low water temperature
of the Zhujiang River, thus the performance in cleaning CQM was somewhat
- Around 45th day since operation started, the reduced filtering
performance of water intake made cooling water pump partly clogged,
resulting in volume reduction of cooling water, which finally influenced the
cleaning of CQM. However, after the cooling water volume was further
stabilized, CQM went again into normal operation.
2. Heat exchange rate of condensers has been enhanced by solving the clogging, achieving high energy conservation.
After 45 days of safe operation, the performance in energy saving of CQM was tested, about which comparison had been made for one month with the refrigerated water compressor 1# with no CQM installed. As a result, 2 scientific calculation result has shown CQM saved energy significantly.