A Set Point Optimization Method for Absorption Chiller Based on Inverse Neural Network

doi:10.7652/xjtuxb201801018

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A Set Point Optimization Method for Absorption Chiller Based on Inverse Neural Network

更新时间：2025-07-09

- A Set Point Optimization Method for Absorption Chiller Based on Inverse Neural Network
- Vol. 52, Issue 1, Pages: 123-128+142(2018)
- 作者机构：
  
  天津大学电气自动化与信息工程学院,天津,300072
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201801018
  CLC： TB651;TP273
- Online First：10 January 2018，
  
  Published：2018
- 稿件说明：
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A Set Point Optimization Method for Absorption Chiller Based on Inverse Neural Network[J]. 2018, 52(1): 123-128+142.
DOI：

A Set Point Optimization Method for Absorption Chiller Based on Inverse Neural Network[J]. 2018, 52(1): 123-128+142. DOI： 10.7652/xjtuxb201801018.

摘要

针对吸收式制冷机组非线性、难以控制的特点

提出了一种基于逆神经网络模型的设定点优化方案。首先

以11.5 kW单效溴化锂吸收式制冷机组为对象

使用人工神经网络方法建立了机组模型

通过对溴冷机制冷原理的分析

建立了系统结构为5-6-2的网络模型

该神经网络模型的相关系数大于0.99且方均根误差小于0.2%

与实验数据取得了良好的拟合效果; 然后

利用该模型对溴冷机的各个输入参数进行灵敏度分析

并据此选择热水供水温度与冷却水流量作为优化方法的控制输入参数; 最后

以冷冻水输出温度作为系统控制输出

对其进行优化计算

并采用改进的粒子群优化算法与逆神经网络相结合的方法

计算制冷机组的最优控制输入参数。通过实验与仿真分析

可知该算法的计算时间在30 s以内

低于吸收式制冷机组的稳定时间; 溴冷机的目标输出与仿真计算结果间的误差小于0.02%

表明该方案可以应用于吸收式制冷机组的在线控制。

Abstract

In view of the nonlinearity and difficulty in control of absorption chiller

a set point optimization method based on inverse neural network model is proposed. Firstly

taking an 11.5 kW single-effect lithium bromide absorption chiller as the research object

an artificial neural network method is used to establish a model of the unit. Through the analysis of the chiller

a network model with a 5-6-2 structure is established. The correlation coefficient of the neural network model is more than 0.99 and the root mean square error is less than 0.2%

so the experimental data are well fitted. Subsequently

the sensitivity analysis of each input parameter of the chiller is conducted to select the hot water supply temperature and the cooling water flow rate as the control input parameters to be estimated. Finally

as the control output of the system

the chilled water output temperature is optimized. The optimal control input parameters of the chilling system are estimated by combination of an improved particle swarm optimization and the inverse neural network algorithm. Through the analysis of experiment and simulation

the calculation time of this method is within 30 s

which is shorter than the stable time of absorption chiller. Moreover

the error between target output and simulation calculation is less than 0.02%. These results show that the proposed scheme is suitable for online control of absorption chiller.

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references

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