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Unit starting control method and device adapting to variable flow

A start-up control and variable flow technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of frequent start and stop of flow adjustment, and achieve the effect of reducing unit start-up, reducing energy consumption, and reducing frequent start-stop

Active Publication Date: 2019-05-17
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the embodiment of the present invention, a method and device for controlling start-up of a unit adapting to variable flow rate are provided to solve the problem of frequent start-up and stoppage caused by the flow adjustment of the unit in the prior art

Method used

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  • Unit starting control method and device adapting to variable flow
  • Unit starting control method and device adapting to variable flow
  • Unit starting control method and device adapting to variable flow

Examples

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Comparison scheme
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Embodiment 1

[0026] figure 1 It is a flow chart of a method for controlling start-up of a unit adapting to variable flow according to an embodiment of the present invention, as shown in figure 1 As shown, the method includes the following steps:

[0027] Step S101, in the standby state of the unit, monitor the operating parameters of the water system of the unit;

[0028] Step S102, judging according to the operating parameters whether the water system is in an under-load state; and judging according to the operating parameters whether the water system is in a load-increasing state;

[0029] Step S103, if the load of the water system is too small, then trigger the unit to continue to stay in the standby state;

[0030] Step S104, if the water system is in the state of increasing load, trigger the unit to enter the state of ready to start.

[0031] In this embodiment, the start-up timing of the unit is controlled in advance by extracting multi-dimensional operating parameters. Thereby r...

Embodiment 2

[0051] This embodiment introduces the implementation process of the present invention by way of example with reference to the accompanying drawings.

[0052] figure 2 is a flow chart of unit start-up control according to an embodiment of the present invention, such as figure 2 As shown, the process includes the following steps:

[0053] Step S201, collecting chilled water flow of the unit;

[0054] Step S202, judging whether the chilled water flow Q is between 45% and 60% of the rated flow; if yes, execute step S203, if not, execute step S201;

[0055] Step S203, collecting chilled water flow changes of the unit within the last 5 seconds;

[0056] Step S204, judging whether the chilled water flow change is ≤5m 3 / h; if yes, the trigger unit is in the ready-to-start state, execute step S205, if not, execute step S203;

[0057] Step S205, collecting the number of shutdowns of the unit within half an hour;

[0058] Step S206, judging whether the number of shutdowns of the...

Embodiment 3

[0062] corresponds to figure 1 The introduced control method for unit start-up adapted to variable flow, this embodiment provides a unit start-up control device adapted to variable flow, such as image 3 The structural block diagram of the unit start-up control device adapted to variable flow shown, the device includes:

[0063] The parameter monitoring module 10 is used to monitor the operating parameters of the water system of the unit in the standby state of the unit;

[0064] The first state judging module 20 is connected to the parameter monitoring module 10, and is used to judge whether the water system is in an under-loaded state according to the operating parameters;

[0065] The second state judging module 30 is connected to the parameter monitoring module 10, and is used to judge whether the water system is in a state of load increase according to the operating parameters;

[0066] The first processing module 40 is connected to the first state judging module 20, an...

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Abstract

The invention discloses a unit starting control method and device adapting to variable flow. The method comprises the following steps that in a standby state of a unit, running parameters of a water system of the unit is monitored; whether the water system is in an over small load state or not is judged according to the running parameters; whether the water system is in a load increase state or not is judged according to the running parameters; if the water system is in the over small load state, the unit is triggered to continue keeping the standby state; and if the water system is in the load increase state, the unit is triggered to enter a ready-to-start state. According to the method, an unit starting control logic adapting to the variable-flow water system is provided, the multi-dimensional running parameters are extracted, and thus the starting time of the unit is controlled in advance; and therefore, frequent starting and stopping of the unit can be reduced, the fault rate of the unit can be reduced, unnecessary unit starting is reduced, energy consumption of the system is reduced, and the temperature stability of the water system is improved.

Description

technical field [0001] The present invention relates to the field of unit technology, in particular to a method and device for controlling start-up of a unit adapted to variable flow. Background technique [0002] In related technologies, frequency conversion circulating pumps are often used on the chilled water side of the unit. Its working principle is to adjust the flow rate according to the end-use demand. When the end-use demand is low, the system flow rate is reduced to achieve the purpose of energy saving. However, when the system is in low-flow operation, the load is small, and the water temperature reaches the start-up condition of the unit, the start-up of the unit will cause the water temperature to change sharply, and the water temperature will drop in a short time to reach the standby water temperature of the unit, which will easily lead to repeated start-up and stop of the unit , the unit is prone to failure and shortens the service life. The temperature of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/00
Inventor 刘华赵明智龙忠铿罗炽亮王双亮
Owner GREE ELECTRIC APPLIANCES INC
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