Water chilling unit control method

Abstract

The invention discloses a water chilling unit control method. The method comprises the following steps that (1) the chilled water inlet and outlet temperature difference Ymax in the full load state is detected; (2) the initial value X of the target chilled water outlet temperature is determined according to the chilled water inlet and outlet temperature difference Ymax in the full load state and is used as an initial parameter of a water chilling unit for control; (3) the indoor required load is detected regularly, and when the indoor required load changes, the current chilled water inlet and outlet temperature difference Y corresponding to the current indoor required load is detected; (4) a new target chilled water outlet temperature X current is computed; and (5) control is conducted according to the new target chilled water outlet temperature X current. According to the water chilling unit control method, when the indoor required load is lowered, through a mode of lowering the chilled water outlet temperature, decrease of the temperature difference is offset, then the effect that the water inlet temperature is constant is ensured, the water inlet temperature directly reflects the sendible temperature, and thus comfort is not influenced.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method for controlling a chiller. Background technique [0002] The energy consumption of the chiller is often an important part of the energy consumption of the public building system. The power consumption of the main engine of the chiller accounts for more than half of the total power consumption of the air conditioning system, and its operating efficiency has a significant impact on the overall efficiency of the air conditioning system. During the operation of the air-conditioning season, the chiller operates at part load most of the time. The chiller routinely sets the target chilled water outlet temperature as X degrees. If the temperature decreases, the inlet water temperature will be relatively low; the indoor human perception temperature will still be low, which will affect the comfort. And when the indoor demand load continues to decrease, the chiller will e...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low indoor human-sensed temperature and poor comfort when the indoor demand load is reduced during the operation of the existing chiller, and the chiller is likely to reach the shutdown temperature and cause frequent start-up and shutdown, the present invention proposes a chiller The control method is to reduce the outlet temperature of chilled water when the indoor demand load decreases, which is used to offset the decrease in temperature difference, thereby ensuring a constant inlet water temperature. The inlet water temperature directly reflects the human feeling temperature, so it will not affect comfort

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