Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (03): 176-184.doi: 10.13475/j.fzxb.20210104909

• Machinery & Accessories • Previous Articles     Next Articles

Mathematical modeling and dynamic simulation of air conditioning system in spinning workshop

JI Jie1, HAN Yunlong1, GAO Jie2, WANG Huming2, LU Biao1   

  1. 1. School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China
    2. Jiangsu Jingya Environmental Technology Co., Ltd., Wuxi, Jiangsu 214426, China
  • Received:2021-01-21 Revised:2021-06-28 Online:2022-03-15 Published:2022-03-29

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Abstract:

In order to study the dynamic change of temperature and humidity in spinning workshop and provide operation platform for the automatic control strategy of air conditioning system, the models of spray chamber and spinning workshop were established respectively on the basis of heat, moisture and air-volume balance. The dynamic simulation platform of spinning air conditioning system was developed by Python and PyQt5 which support business logic programming with developed graphical user interface. The fresh air control strategy of dew point was established, and the automatic control of the temperature and humidity in the workshop was achieved based on the proportional integral derivative(PID)control algorithm. Taking the structure, process and air conditioning equipment of a spinning workshop as the basic parameters and boundary conditions of the simulation platform, the temperature and humidity changes in the workshop after changing the control parameters of air conditioning equipment were simulated. The results show that the simulation platform of air conditioning system of the spinning workshop is useful to adjust and control the air conditioning equipment. It can calculate the machine dew point of spray chamber, the changing value of the temperature and humidity, and the response time when the temperature and humidity are stable to the set temperature and humidity for the workshop. The simulation platform of spinning air-conditioning system has the virtual operation environment of a spinning workshop, which can be used to study the control strategy of the air-conditioning system.

Key words: spinning workshop, air conditioning system, mathematical model, simulation platform, PID control algorithm

CLC Number: 

  • TS108.3

Fig.1

Model of air conditioning system in spinning"

Fig.2

Control strategy of temperature"

Fig.3

Control strategy of humidity"

Tab.1

Basic setting parameters"

车间初始参数 数值 车间初始参数 数值
空气密度/(kg·m-3) 1.2 墙体温升系数 40
墙体密度/(kg·m-3) 2 500 喷水室迎风面积/m2 13
空气比热容/
(kJ·kg-1·℃-1)		 1.01 水泵额定转速/
(r·min-1)		 2 900
墙体比热容/
(kJ·kg-1·℃-1)		 0.93 水泵额定流量/
(m3·h-1)		 200
车间体积/m3 14 000 送风机额定转速/
(r·min-1)		 890
墙体体积/m3 100 送风机额定送风量/
(m3·s-1)		 66.67

Fig.4

Main interface of simulation platform"

Fig.5

Simulation parameter setting. (a) Basic setting module;(b) Spinning workshop module;(c) Spray chamber thermal module;(d) Control strategy module; (e) PID control module"

Fig.6

Influence of fresh air on machine dew-point temperature and moisture content"

Fig.7

Influence of second return air valve opening on temperature and humidity. (a) Change of temperature;(b) Change of moisture content"

Fig.8

Influence of fan frequency on temperature and humidity.(a) Change of temperature;(b) Change of moisture content"

Fig.9

Changes of temperature and humidity with parameters of workshop"

Fig.10

PID automatic control of temperature and humidity"

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