Chiller and its control method and device

Abstract

The invention discloses a cooling water unit and a control method and device thereof. The control method comprises the steps that an evaporation-condensation parameter set of the cooling water unit isdetected and comprises an evaporation parameter and a condensation parameter; the detected evaporation-condensation parameter set is matched with data in an energy conservation database, and the datastored in the energy conservation database comprise an evaporation-condensation parameter set under an energy conservation condition and an operating state parameter, corresponding to the evaporation-condensation parameter set under the energy conservation condition, of the cooling water unit; and when the detected evaporation-condensation parameter set is matched with the evaporation-condensation parameter set under the energy conservation condition in the energy conservation database, the cooling water unit is controlled to run according to the operating state parameter corresponding to thematched evaporation-condensation parameter set. The operating state of the unit is adjusted directly through change situations of the two parameters, so that energy conservation of the cooling waterunit is realized under the condition of improving control accuracy, and the energy conservation excellent performance of the cooling water unit is guaranteed.

Description

technical field [0001] The invention relates to the technical field of refrigeration control, in particular to a water chiller and its control method and device. Background technique [0002] In the field of refrigeration control technology, the energy consumption of chillers accounts for a large proportion of the energy consumption of central air-conditioning systems in buildings. Improving the energy efficiency of chillers is one of the main ways to save energy in central air-conditioning systems. In addition to optimizing the structure of the chiller, optimizing the control method of the chiller is the main means of energy-saving operation. At present, the control of chillers usually takes the chilled water temperature as the target, and adjusts the operating parameters in real time to meet the requirements of energy saving. However, real-time adjustment is time-consuming and energy-consuming. The unit needs to adjust and calculate according to the changing working condi...

AI Technical Summary

Problems solved by technology

Although this method avoids the disadvantages of real-time adjustment and re-adjustment of the unit, the method takes local weather factors and real-time environmental factors as adjustment factors to control the accuracy of other operating components of the central air-conditioning system such as water pumps and cooling towers. Higher, but the control accuracy is not high for the control of the chiller, although the adjustment time is saved, but the energy-saving excellence of the adjustment cannot be guaranteed

[0003] To sum up, the current chiller control is difficult to meet both control accuracy and energy saving.

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