Title: Analysis on the lowest frequency limit of variable frequency chilled water pump
Abstract: After analyzing the various requirements of chilled water flow rate of the equipments in air-conditioning chilled water system, with consideration of the chilled water loop characteristics and the integrative efficiency of chilled water pump, pump motor and variable frequency drive (VFD), the author presents a general method to determine the lowest frequency or the operating frequency range of variable frequency chilled water pump in air-conditioning system. Meanwhile, a concept of equivalent static head is put forward on the basis of the relationship between air-conditioning (AC) loads and chilled water loop characteristics. The results show that the pump affinity laws cannot be directly used to determine the pump's operating points or the operating frequency range under the variable AC loads.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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