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Central air-conditioner chilled water control method based on dynamic response to tail-end total load changes

A control method and central air-conditioning technology, applied in the direction of heating and ventilation control systems, applications, heating methods, etc., can solve the problems of control failure, affecting the rapidity and stability of the system, and poor accuracy

Active Publication Date: 2015-02-18
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-conditioner chilled water control method based on dynamic response to tail-end total load changes
  • Central air-conditioner chilled water control method based on dynamic response to tail-end total load changes
  • Central air-conditioner chilled water control method based on dynamic response to tail-end total load changes

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Experimental program
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Effect test

Embodiment 1

[0100] combine figure 1 with figure 2 , a central air-conditioning chilled water control method based on the dynamic response to the change of the total load at the end:

[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 chilled water return water h , calculate the chilled water supply and return water temperature difference ΔT = T g -T h ;Set chilled water supply and return water temperature difference setting value ΔT sp ;Calculate the set value of the chilled water supply and return water temperature difference ΔT sp The difference with 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 ΔP of the chilled water supply and return; set the minimum pressure difference of the chilled water supply and return to ΔP sp ;Calcula...

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 Process the difference with the temperature difference ΔT of the chilled water supply and return water to obtain the output v2;

[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 chilled water supply and return water sp Calculate the difference between the pressure difference ΔP and the chilled water supply and return water to obtain the output v4;

[0113] 4) The high value selector selects the larger one of output v3 and output v4 as output v5;

...

Embodiment 3

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

[0118] G ff = 2 k d M N e - Ts ( T m s + 1 ) ( T d s + 1 )

[0119] The physical meaning represented by the letters in the formula:

[0120] In the frequency converter and cold pump water pump system,

[0121] M = ...

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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 central air-conditioning chilled water control method based on dynamic response to terminal total load changes. Background technique [0002] With the development of modern science and technology and the improvement of people's living standards, central air-conditioning is widely used, making great contributions to the improvement of people's living and working environment quality, but also brings a lot of power consumption, generally accounting for the entire 40% to 60% of building electricity load. The chilled water system is the central component of the central air-conditioning system and 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 water system not only directly consumes a large amount of ele...

Claims

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Application Information

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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
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