Water chilling unit and load control method and control device thereof

Abstract

The invention discloses a water chilling unit and a load control method and a control device thereof. The load control method comprises the following steps that the outlet temperature of chilled waterof the water chilling unit is obtained, and the intermediate temperature of the chilled water between an upstream machine and a downstream machine is obtained; each module machine in multiple modulemachines is judged; if the current module machine is the downstream machine, the absolute value of a first temperature gap between the outlet temperature of chilled water and a user setting temperature is calculated, and the load of the downstream machine is controlled according to the absolute value of the first temperature gap; and if the current module machine is the upstream machine, the absolute value of a second temperature gap between the intermediate temperature of the chilled water and a preset dynamic setting temperature is calculated, and the load of the upstream machine is controlled according to the absolute value of the second temperature gap. Accordingly, a compressor can be quickly adjusted in real time to stabilize the change of the outlet water temperature and enhance thecomfort of users, at the same time, the load distribution of all module machines is uniform, the reliability of the compressor is enhanced, and the service life of the unit is prolonged.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a load control method of a chiller, a load control device of the chiller, and a chiller with the control device. Background technique [0002] Chillers (such as magnetic levitation centrifugal units) are more and more widely used because of their advantages such as oil-free, frequency conversion, high efficiency and energy saving. At present, the cooling capacity of a single maglev centrifuge unit is generally small. When the user needs a large cooling capacity, the system needs to use multiple units in series to obtain greater cooling capacity and higher energy efficiency, or the user can reduce the energy consumption of transportation. , requires a large temperature difference in the system, and the way of series connection of units will also be used. [0003] In related technologies, the main disadvantages of the series control of the system are as follows: first, th...

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Problems solved by technology

[0003] In related technologies, the main disadvantages of the series control of the system are as follows: first, the operating load of the compressors of each unit in the system is unbalanced, which affects the reliability of the compressor and the life of the unit; second, the load adjustment control of each unit is complicated, and the adjustment is not timely. The water temperature fluctuates greatly, and the user's comfort experience is low

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