Control method and control device of freezing pump after refrigerator closing down and central air conditioner system

Abstract

The invention provides a control method and control device of a freezing pump after refrigerator closing down and a central air conditioner system. During refrigerator closing down, the water supply temperature, the water returning temperature and the freezing water flow of freezing water in a freezing water system are collected so as to obtain the remaining cold amount of a freezing water system, the water supply temperature and the water returning temperature of the freezing water are collected at the first moment after closing down, the energy conservation is used for enabling the cold amount at the front moment and the cold amount at the rear moment to be equal, the freezing water flow at the first moment is calculated, according to the freezing water flow, the freezing pump at the first moment is controlled to run in a frequency-converting manner, the freezing water flow at the second moment is obtained, the freezing pump is controlled to run in a frequency-converting manner, the freezing water flow of the next moment is repeatedly obtained, and the frequency converting running of the freezing pump is controlled until the water supply and returning temperature difference of freezing water is smaller than 1 DEG C. According to the method, through control over frequency-converting running of the freezing pump, the remaining cold amount in the freezing water system is continuously subject to heat exchange with the indoor environment, temperature rise in a room slows down, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of large-scale central air-conditioning, in particular to a control method, a control device and a central air-conditioning system for a refrigeration pump after a refrigerator is shut down. Background technique [0002] In my country, air-conditioning energy consumption accounts for an increasing proportion of the total energy consumption of the society, and air-conditioning energy consumption intercoolers take up a considerable portion of energy consumption. The traditional chiller control generally starts and stops according to the working schedule. After the chiller is turned off, a large part of the remaining cooling capacity remains in the chilled water system, and the control of the chiller pump is either shut down with the chiller. The linkage shutdown, or after the chiller is turned off, the refrigeration pump is switched to power frequency control, which fails to effectively utilize the remaining c...

AI Technical Summary

Problems solved by technology

The traditional chiller control generally starts and stops according to the working schedule. After the chiller is turned off, a large part of the remaining cooling capacity remains in the chilled water system, and the control of the chiller pump is either shut down with the chiller. The linkage shutdown, or after the chiller is turned off, the refrigeration pump is switched to power frequency control, which fails to effectively utilize the remaining cooling capacity in the chilled water system, resulting in waste of energy consumption

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