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Central air-conditioning chilled water control method based on dynamic response to terminal total load change

A control method and dynamic response technology, applied in heating and ventilation control systems, applications, heating methods, etc., can solve problems such as control failure, affecting the rapidity and stability of the system, and poor accuracy

Active Publication Date: 2017-03-08
江苏联宏智慧能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of central air-conditioning chilled water control method based on dynamic response terminal total load change, to overcome two problems in the central air-conditioning chilled water system mode in the prior art, one is for the constant temperature difference control mode due to The large inertia and large time lag characteristics of the chilled water system affect the rapidity and stability of the system. The second is the problem of poor accuracy and control failure caused by the pressure difference in the constant pressure difference control that cannot accurately reflect the change of the end load.

Method used

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  • Central air-conditioning chilled water control method based on dynamic response to terminal total load change
  • Central air-conditioning chilled water control method based on dynamic response to terminal total load change
  • Central air-conditioning chilled water control method based on dynamic response to terminal total load change

Examples

Experimental program
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Effect test

Embodiment 1

[0100] combine figure 1 and figure 2 , a central air-conditioning chilled water control method based on dynamic response to terminal total load changes:

[0101] a1: The first temperature sensor collects the temperature T of the chilled water supply g , the second temperature sensor collects the temperature T of the return water of the chilled water h , calculate the temperature difference between the supply and return water of the chilled water ΔT=T g -T h ;Set chilled water supply and return water temperature difference set value ΔT sp ;Calculate chilled water supply and return water temperature difference set value ΔT sp The difference between the chilled water supply and return water temperature difference ΔT, the difference is sent to the controller;

[0102] a2: The pressure difference sensor collects the pressure difference between the supply and return of the chilled water ΔP; set the minimum pressure difference between the supply and return of the chilled water...

Embodiment 2

[0109] Based on the method described in Embodiment 1, the controller includes a temperature difference controller, a pressure difference controller, an adder, a high value selector, a limiter processor, and a converter, and the control strategy is:

[0110] 1) The temperature difference processor sets the temperature difference ΔT for the chilled water supply and return water sp The output v2 is obtained by processing the difference between the chilled water supply and return water temperature difference ΔT;

[0111] 2) The adder adds the output v2 and the output v1 of the feedforward controller to obtain the output v3;

[0112] 3) The differential pressure sensor sets the minimum differential pressure ΔP for the chilled water supply and return water sp Calculate the difference between the chilled water supply and return water pressure difference ΔP to obtain the output v4;

[0113] 4) The high value selector selects the larger of the output v3 and the output v4 as the outpu...

Embodiment 3

[0117] Based on the method described in Embodiment 1, the transfer function of the feedforward controller is G ff :

[0118]

[0119] The physical meanings of the letters in the formula:

[0120] In the inverter and cold pump water pump system,

[0121]

[0122] k d is the open-loop gain, T d is the inertia time constant, f is the frequency of the inverter;

[0123] In the air conditioning system,

[0124]

[0125] M N Design mass flow for chilled water, T m is the inertia time constant of the system, T is the pure time delay time constant of the system, M is the mass flow of chilled water, Q is the total load at the end, C w is the specific heat capacity of water.

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Abstract

The invention provides a central air-conditioner chilled water control method based on dynamic responses to tail-end total load changes. A system tail-end total load Q is obtained through the real-time statistics of a load of each piece of tail-end equipment; meanwhile, a chilled water supply temperature Tg, a chilled water return temperature Th and a water collector / separator pressure difference DeltaP are collected; the intelligent control that the cooling capacity of a chilling station is matched with the tail-end loads is realized by the system according to Q, Tg, Th and DeltaP in a control way of combining feedback control and feedforward control. According to the method, the feedforward control guarantees the rapidness of the system, and the feedback control guarantees the accuracy of the system; when the two are combined, the demand of the chilling station on timely and accurate response to the tail-end loads is realized; and therefore, the refrigeration performance of the tail-end equipment is guaranteed.

Description

technical field [0001] The invention relates to the technical field of energy and energy saving, in particular to a method for controlling chilled water in a central air conditioner based on a dynamic response to changes in total terminal load. Background technique [0002] With the development of modern science and technology and the improvement of people's living standards, the application of central air conditioners is very extensive, which has made great contributions to the improvement of the quality of people's living and working environment, but also brought a lot of power consumption, which generally accounts for the entire 40% to 60% of building electricity load. The chilled water system is the central part of the central air-conditioning system, and it is the porter of cooling capacity. The energy consumption of the chilled water system accounts for 10% to 15% of the energy consumption of the entire central air-conditioning system. The operation of the chilled wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/00
CPCF24F11/83
Inventor 吴宝财何升强周泽宇
Owner 江苏联宏智慧能源股份有限公司