The Control Method of Staggered Defrost for Multiple Groups of Units

Abstract

The invention relates to a control method for staggered defrosting of multiple units. The control method for the staggered defrosting of multiple units comprises the following steps of presetting the defrosting cycles of N units, respectively being T+(1-1)a, T+(2-1)a...T+(N-1)a; electrifying the N units for running, correspondingly presetting one defrosting cycle for each unit, and enabling the N units to separately carry out defrosting according to respective defrosting cycles; and when the duration that the units run according to the preset defrosting cycles reaches a rotating cycle K, presetting the defrosting cycles corresponding to the N units again according to the N defrosting cycles, wherein the former preset defrosting cycles of at least two units are not equal to the corresponding defrosting cycles reset in this time. The control method for the staggered defrosting of multiple units can regulate the accumulative defrosting duration of the units in a balancing manner under the condition of meeting the heat supply requirements of users, and at the same time, can regulate the running duration of each unit in a balancing manner.

Description

technical field [0001] The invention relates to the technical field of unit operation control, in particular to a control method for multiple sets of units to perform defrosting in a staggered manner. Background technique [0002] Large-scale HVAC projects use N sets of heat pump units for common heating to meet the demand, but usually the factory configuration of the same type of units is generally the same, so when N sets of heat pump units are used for common heating at the same time, the following problems will occur: [0003] 1. The N groups of units set by the unit enter the defrosting state at the same time, causing the N groups of units to stop heating at the same time and unable to meet the user's heating demand; [0004] 2. The target temperature set by the N groups of units is the same. When the temperature on the user side reaches the target temperature, the N groups of units will stop or start at the same time, resulting in unnecessary waste of resources; [00...

AI Technical Summary

Problems solved by technology

[0003] 1. The N groups of units set by the unit enter the defrosting state at the same time, causing the N groups of units to stop heating at the same time and unable to meet the heating demand of users;

[0004] 2. The target temperature set by the N groups of units is the same. When the temperature on the user side reaches the target temperature, the N groups of units will stop or start at the same time, resulting in unnecessary waste of resources;

[0005] 3. If different defrosting cycles are set for each unit, running for a long time under this defrosting cycle may cause the defrosting of the unit with a long defrosting cycle to be unclean and affect the heat exchange efficiency of the unit; If the frost is too frequent, the heating capacity of the unit will be reduced; if different target temperatures are set for the unit, the heating capacity of each unit will be different. different

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