Executive capability adjustment method and device of water chilling unit

Abstract

The invention provides an executive capability adjustment method and device of a water chilling unit. The executive capability adjustment method includes the steps that outlet chilled water temperature of the water chilling unit during starting is obtained; the difference value of the outlet chilled water temperature and a preset target value is determined; the target value is adjusted according to the difference value, and the frequency loading speed is determined according to the adjusted target value; and the executive capability of the water chilling unit is adjusted according to the frequency loading speed. According to the executive capability adjustment method and device of the water chilling unit, the technical problem in the prior art that adjustment is carried out at the same frequency loading speed, so that excessive loading and unloading of the unit are caused is solved, and therefore the needed time from starting to stabilization is effectively shortened, and the purpose of stable and fast starting of the unit is realized.

Description

Technical field [0001] The invention relates to the technical field of water chillers, and in particular to a method and device for adjusting the execution capability of a water chiller. Background technique [0002] At present, most of the frequency conversion centrifugal chillers monitor the chilled water outlet temperature in real time, and adjust the speed (frequency) of the unit according to the difference between it and the set target value, so as to achieve the purpose of adjusting the capacity of the unit. Specifically, when the chilled water outlet temperature is higher than the target value, the unit's execution capability is increased. When the chilled water outlet temperature is lower than the target value, the unit's execution capability decreases. When the chilled water outlet temperature is equal to the target value, the unit's execution capability Keep moving. [0003] However, although the above-mentioned adjustment method can make the chiller meet the user's requ...

AI Technical Summary

Problems solved by technology

[0003] However, although the above-mentioned adjustment method can make the chiller meet the user's requirements, due to the hysteresis of the water temperature adjustment, that is, after adjusting the speed or frequency of the unit, it will take a while to make the temperature reach the value corresponding to the adjusted speed or frequency. temperature

In this way, when the chilled water outlet temperature is constantly approaching the target value, it is easy to cause the unit to be overloaded, so it takes a long time from startup to stable operation. However, the constant fluctuation of the actual chilled water outlet temperature will cause the actual freezing The difference between the water outlet temperature and the target value is also constantly fluctuating, so the unit will continue to perform loading and unloading actions until it stabilizes

[0004] In view of the above problems, no effective solution has been proposed

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