Through test

the influence of cooling water flow rate upon condenser’s peformance has been studied

the variation regulavity of condenser’s pressure

coefficient of heat transfer

terminal temperature difference（TTD） along with the cooling water flow rate being obtained. The test results show that the condenser’s pressure approximately decreases like linearity

and the coefficient of heat transfer approximately increases like linearity along with the cooling water flow rate in the range of tested parameters. But the influence of cooling water flow rate upon the condenser’s TTD has a critical value. Theoritical analysis shows: If the coefficient of heat transfer was calculated by using the formula of American Heat Exchanger Institute （HEI）

the TTD increases along with the increase of cooling water flow rate when the number of transfer units（NTU） is larger than 1.59; the TTD decreases along with the increase of cooling water flow rate when NTU is smaller than 1.59

These agree well with the test results.