The Analysis of Tianjin Subway Environmental Control System

2012 ◽  
Vol 535-537 ◽  
pp. 2135-2138 ◽  
Author(s):  
Li Chang ◽  
Chen Hui Tang ◽  
Zheng Li
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Environmental Control ◽  
Distribution Characteristic ◽  
Two Systems ◽  
Subway System ◽  
Environment Control ◽  
Environment Simulation ◽  
The Difference ◽  
Different Characteristics

The paper takes Tianjin subway as an example, and use the Subway Environment Simulation (SES) program to establish subway system with platform screen doors or different characteristics of two systems to carry out the simulate computation in summer, transition season and winter of the two systems; by analyzing the difference between two environment control modes, get the chart of the temperature distribution characteristic. The table result showed that it has more advantages using closed system than PSD system in Tianjin by using the primary invests and saving energy consumption.

Simulation and Comparative Analysis on Environmental Control in Subway

2012 ◽  
Vol 209-211 ◽  
pp. 1068-1072
Author(s):  
Ming Liu ◽  
Bao Gang Zhang ◽  
Liu Wen ◽  
Zhong Zhi Huang
Keyword(s):  
Temperature Field ◽  
Energy Consumption ◽  
Comparative Analysis ◽  
Environmental Control ◽  
Thermal Environment ◽  
Airflow Velocity ◽  
Waiting Room ◽  
Local Climate ◽  
Average Temperature ◽  
Environment Control

To ensure passengers can have a comfortable thermal environment in the subway waiting room is one of the main targets in subway environment control. By using the CFD software, this paper takes an island platform with double-layer of Shenyang as the object to simulate the thermal environment of platform screen door and ventilation in the open system, then detailed analysis on the variation of the temperature field, airflow velocity field in the typical position. The results indicated that average temperature of no-PSD system platform is 2.5 ~3 °C higher than that of PSD system, standing room is 1.5 °C higher than that of PSD system , but these also meet the requirement of the standards of the environmental control and passengers’ thermal comfort. Meanwhile, through the comparative analysis to the energy consumption of the two systems, we find ventilating condition has superior to PSD system in energy saving, and it is more suitable for the local climate in the northeast.

Piggery Environmental Control System Based on Wireless Sensor Networks with Energy Optimization

2014 ◽  
Vol 687-691 ◽  
pp. 865-868
Author(s):  
Wei Xing Zhu ◽  
Xiu Yi Mei ◽  
Yao Lu ◽  
Jian Fei Zhang
Keyword(s):  
Wireless Sensor Networks ◽  
Control System ◽  
Sensor Networks ◽  
Environmental Control ◽  
Energy Optimization ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Control Center ◽  
Environment Control ◽  
Two Phases

According to the characteristics of piggery, such as complex environment, numerous control objects, complex wiring, a piggery environment control system based on wireless sensor networks was designed. This system consisted of the wireless network composed of various devices and sensors in piggery, the control center with ARM-LINUX and the remote control center. The energy of sensor nodes was offered by batteries in wireless sensor networks so that the power source was limited. In order to strengthen the node energy management, the LEACH algorithm was combined with AODV routing protocol, and a new optimization algorithm called LEACH-A was proposed in this paper. The wireless sensor networks execution process was divided into two phases, including cluster building and data transmission. In the two phases, the node residual energy was calculated by a weighted function and the cluster head role was changed by the size of remaining energy. NS-2 simulation results show that the proposed algorithm prolonged the lifetime of the nodes and the networks, and realized the energy optimization management.

scholarly journals A hybrid environment control system combining EMG and SSVEP signal based on brain-computer interface technology

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
Mamunur Rashid ◽  
Bifta Sama Bari ◽  
Norizam Sulaiman ◽  
Mahfuzah Mustafa ◽  
Md Jahid Hasan ◽  
...  
Keyword(s):  
Control System ◽  
Real Time ◽  
Control Method ◽  
Environmental Control ◽  
Brain Computer Interface ◽  
Computer Interface ◽  
Neural Pathways ◽  
Common Spatial Pattern ◽  
Environment Control ◽  
Bci System

AbstractThe patients who are impaired with neurodegenerative disorders cannot command their muscles through the neural pathways. These patients are given an alternative from their neural path through Brain-Computer Interface (BCI) systems, which are the explicit use of brain impulses without any need for a computer's vocal muscle. Nowadays, the steady-state visual evoked potential (SSVEP) modality offers a robust communication pathway to introduce a non-invasive BCI. There are some crucial constituents, including window length of SSVEP response, the number of electrodes in the acquisition device and system accuracy, which are the critical performance components in any BCI system based on SSVEP signal. In this study, a real-time hybrid BCI system consists of SSVEP and EMG has been proposed for the environmental control system. The feature in terms of the common spatial pattern (CSP) has been extracted from four classes of SSVEP response, and extracted feature has been classified using K-nearest neighbors (k-NN) based classification algorithm. The obtained classification accuracy of eight participants was 97.41%. Finally, a control mechanism that aims to apply for the environmental control system has also been developed. The proposed system can identify 18 commands (i.e., 16 control commands using SSVEP and two commands using EMG). This result represents very encouraging performance to handle real-time SSVEP based BCI system consists of a small number of electrodes. The proposed framework can offer a convenient user interface and a reliable control method for realistic BCI technology.

scholarly journals Fuzzy Logic Based Environment Control of Operation Theatre

2021 ◽  
Vol 12 (1S) ◽  
pp. 220-232
Author(s):  
Sakshi Srivastav, Et. al.
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Fuzzy Logic Control ◽  
Fuzzy Logic Controller ◽  
Environmental Control ◽  
Environmental Parameters ◽  
Operation Theatre ◽  
Micro Particles ◽  
Logic Control ◽  
Environment Control

It is very critical and important to maintain the appropriate climatic conditions in the operation theatre. In paper, we present an approach to control total environmental conditions for the operation theatre. Generally for environmental control of operation theatre air conditioning system is installed. In operation theatre environmental parameters like humidity, temperature, oxygen and particles etc. have to be controlled precisely. All the environmental parameters are of nonlinear nature hence, difficult to control or model with the help of conventional control systems. Keeping in mind the complexity and nonlinearity of these parameters as fuzzy logic controller (FLC) for controlling all the environment of operation theatre has been designed. For this fuzzy logic control system temperature, micro particles, humidity & oxygen have been taken as input parameters and based on these parameters  speed of AC motor as well as the speed of exhaust motor are controlled. The control system is implemented with the help of different fuzzy rules and their membership functions derived from actual conditions. The performance of the system for control of operation theatre was studied and it has been observed that the result obtained with the fuzzy logic control system provides more effective and economical control. The fuzzy logic control system has been implemented using fuzzy Tech development tool.

Bayesian network method for fault diagnosis of civil aircraft environment control system

2019 ◽  
Vol 234 (5) ◽  
pp. 662-674
Author(s):  
Cui Liu ◽  
Jianzhong Sun ◽  
Fangyuan Wang ◽  
Shungang Ning ◽  
Guofan Xu
Keyword(s):  
Control System ◽  
Fault Diagnosis ◽  
Bayesian Network ◽  
Environmental Control ◽  
Fault Isolation ◽  
Commercial Aircraft ◽  
Extraction Technology ◽  
Data Set ◽  
Network Method ◽  
Environment Control

This paper addresses the issues of fault diagnosis of the environmental control system of a certain commercial aircraft model of which the environmental control system has a high failure rate in field and causes many unplanned maintenance events. Because of the complexity and reciprocal compensation mechanism of the environmental control system, it is difficult to carry out fault isolation timely once the failure occurred during aircraft turnaround time, which thus may cause flight delay or even cancelation. The original contribution of this work is to propose a Bayesian network–based fault diagnosis method for commercial aircraft environmental control system where a multi-information fusion mechanism is used to incorporate the system first principle, expert experience and condition monitoring data. It incorporates extraction technology of sensor feature parameters and the structural learning of Bayesian network to realize the effective diagnosis of multiple faults. A case study is conducted based on a data set from a commercial aircraft fleet. The results show that the fault isolation ratio of this method is greater than 89%. The proposed Bayesian fault diagnosis network method can be used as a troubleshooting tool for airline maintenance technicians in fault isolation of environmental control system, reducing the time spent on-line troubleshooting and aircraft downtime.

scholarly journals Sustainability of Evaporative Cooling System for Environment Control for Preservation of Unearthed Historical Sites within Archaeological Museums in China

2020 ◽  
Vol 12 (23) ◽  
pp. 9882
Author(s):  
Bin Chang ◽  
Yuexi Dang ◽  
Xilian Luo ◽  
Chuck Wah Yu ◽  
Zhaolin Gu
Keyword(s):  
Energy Consumption ◽  
Environmental Control ◽  
Cooling System ◽  
Evaporative Cooling ◽  
High Energy ◽  
Suitability Analysis ◽  
Large Space ◽  
Desiccation Cracking ◽  
Evaporative Cooling System ◽  
Environment Control

Archaeological museums are usually constructed at the location where historical relic sites are unearthed and are often characterized by large-space building layouts and high energy consumption for the environmental control. However, the traditional strategies for environmental control are limited in protecting the unearthed relics from desiccation cracking and salt concentration. In this study, an environmental control strategy of evaporative cooling system is proposed as a solution to develop a sustainable preservation environment to maintain the condition of the ancient relics at a state of moist saturation. Afterwards, a verification of sustainability and climate suitability analysis of the proposed system were conducted. The results indicate that (1) the evaporative cooling system can fulfil the high humidity preservation environment requirements for the unearthed historical relic sites with a low energy consumption; and (2) the potential use of the evaporative cooling systems is significant in Xi’an and Chengdu (i.e., being 62% and 75%, respectively), and not in Lanzhou and Urumqi. As a conclusion, the proposed strategy provides a sustainable protocol for the preservation of unearthed historical relic sites in archaeological museum.

Phase Change Material Melting in an Energy Storage Module for a Micro Environmental Control System

2018 ◽  
Vol 10 (6) ◽  
Author(s):  
Mustafa Koz ◽  
H. Ezzat Khalifa
Keyword(s):  
Control System ◽  
Energy Consumption ◽  
Thermal Comfort ◽  
Phase Change ◽  
Phase Change Material ◽  
Environmental Control ◽  
Design Parameters ◽  
Airflow Rate ◽  
Local Cooling ◽  
Change Material

Abstract An experimentally validated finite element model (FEM) was developed to analyze the design parameters of a latent heat storage device (LHSD) for a micro environmental control system (μX). The μX provides local cooling to an office worker in a room whose thermostat setpoint has been elevated from 23.9 °C (75 °F) to 26.1 °C (79 °F) in order to reduce heating, ventilation, and air conditioning (HVAC) energy consumption. For this application, the LHSD is designed to provide ≥50 W of cooling for a full, 8.5 h workday to restore thermal comfort in the warm, 26.1 °C room. The LHSD comprises several parallel slabs of encased phase change material (PCM) with interposed airflow channels. The airflow rate is selected to obtain ≥50 W of cooling at the end of the 8.5 h operation. The LHSD exhibits a decreasing cooling rate over the 8.5 h period when a constant airflow is passed through it, indicating that more cooling is supplied during the day than the minimum 50 W required for thermal comfort. The parametric analysis explores the effects of PCM thermal conductivity, slab thickness, air channel width, and number of slabs on LHSD performance. Parametric cases are compared against each other on the basis of their required PCM mass and energy consumption.

scholarly journals The characteristics of particulate matter in different subway station environmental control systems in Beijing

2021 ◽  
Author(s):  
xinru Wang ◽  
liang xia ◽  
fei pei ◽  
zu wang ◽  
yiqiao liu ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Control System ◽  
Control Systems ◽  
Environmental Control ◽  
Strongly Correlated ◽  
Environment Control ◽  
Solid Foundation ◽  
Subway Stations ◽  
Pm2.5 And Pm10 ◽  
Screen System

Abstract The characteristics of inhalable particulate matter (PM2.5, PM10) in urban subway stations can have a major impact on passengers’ health. Existing research largely fails to focus on different environmental control systems and there are few studies focused on different pollution conditions. This study therefore focused on measuring and comparing the characteristics of PM2.5 and PM10 at subway stations with three control systems in Beijing different pollution conditions. Stations including three types of control system (open, closed and screen door) and outside were monitored and analyzed using a general linear model. The concentration of PM2.5 and PM10 at different locations, such as on platforms, in carriages and in working areas, was compared and analyzed under different external pollution conditions. The results show that at different environment control systems the characteristics of PM2.5 and PM10 are different. The concentrations of particles in closed system are generally higher than screen system at platform. While the pollution in carriage is heavier for open system than that of screen system. The PM2.5/PM10 ratio was 91%, 90% and 83.84% at closed, open and screen system, respectively. While, the PM2.5 and PM10 levels inside the stations were strongly correlated with the outdoor conditions regardless of the environmental control system. This is the first study to show the PM concentration characteristics for different subway environmental control systems. As such, it provides a solid foundation for air clean studies at subway stations with different control systems.

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