2011 2nd International Conference on Control, Instrumentation and Automation (ICCIA)

Research on Large-Scale Public Building Energy Consumption Monitoring system

Based on GPRS Technology

Wang Changtao, Wang Jian

Information and Control Engineering Faculty Shenyang Jianzhu University

Shenyang wct@sia.cn, wangjianJes@163.com

Abstract-In this paper, management platform is proposed for

building energy monitoring system which combined embedded

system, GPRS communication technology with RS485 bus

technology. Supply GPRS core software and hardware

implementations method. The program can monitor electricity,

water, heat and other energy parameters in public buildings at

real-time by building energy consumption monitoring system,

in order to achieve the intelligent monitoring and management

for building energy consumption, and achieve remote

monitoring for building energy consumption parameters by

SMS and Internet.

Keywords- GPRS, Energy monitoring, RS485

I. INTRODUCTION

With the development of China's economic construction and social civilization, the pressure of energy saving and emission reduction is higher and higher. In building energy consumption, high energy consumption in national office buildings and large-scale public building is especial prominent. Thus, Notice of Strengthening the Implementation of Energy Management in Government Office Buildings and Large-Scale Public Buildings [1] is provided by the Ministry of Housing. Aim to establish energy consumption monitoring platform to implement energy consumption dynamic detection [2], promote recording energy statistics and performing energy audit [3]. Because of architecture network facilities performance difference, it become possible for using wireless data transmission to achieve communication between building energy consumption controller and monitoring platforms.

GPRS (General Packet Radio Service) network architecture is adding two new node types SGSN (serving GPRS support node) and GGSN (gateway GPRS support node) on existing GSM system [4]. Always online, according to traffic accounting, quick login, high-speed transmission, unlimited in coverage and reliable transmission, all of these are the main advantage of the GPRS network transmission.

This article introduce the GPRS technology and background to the building energy consumption monitoring, and put forward the solution of public building energy consumption monitoring system based on GPRS. Finally summarize the GPRS hardware and software implementation.

978-1-1673-1690-3/12/$31. 00 (C2013 IEEE 424

Zhang Rui, Ma Bin

Information and Control Engineering Faculty Shenyang Jianzhu University

Shenyang zhangrui0325@sjzu.edu.cn, Mabin551 I @163.com

II. SYSTEM ARCHITECTURE

Building energy consumption monitoring system based on GPRS includes hardware system and software system [6]. Software system consists of application modules, database, automated data collection based on GPRS, etc. The focus in this article is the automated data collection based on GPRS. Figure 1 show hardware system is distributed and located in control field of building energy consumption.

Field control layer. The main function of the field control layer is to achieve acquisition, conversion, transmission and control of the monitoring information. Field control layer support two kinds of mode, one is sending a request command to the measuring device command according to the data center command, the other is regularly sends a request to the measuring device [7]. When carrying out building wiring, the distance is greater than 50m, adopt RS485 communication way to connect I/O modules, shielded line is good choice if the distance is less than 50m [8].

Figure I. Hardware structure of consumption monitoring system

Data center. The data from all remote monitoring sites is integrated and stored in the database by the data center, and generated the data that could be released on WEB. Data center is also responsible for uploading the data from all remote monitoring sites to the higher level energy consumption monitoring center.

Data communication from the control layer to the data center utilize GPRS transmission mode. The connection with the data center is initiated by data acquisition subsystem. After the establishment of the TCP connection keeping the status, data acquisition subsystem regularly sends heartbeat packet to the data center and monitors the status of the

2011 2nd International Conference on Control, Instrumentation and Automation (ICCIA)

connection, re-establishes the connection once the connection is broken.

Summary, the core of the system is the building energy consumption data collector. Figure 2 is the field control devices; it can automatically run and process data, manage and control the terminal equipment acquisition through the RS485 bus. Controller through GPRS to achieve communication with data center and other external network, users could remote monitor the system by SMS and internet.

III. SOFTWARE AND HARDWARE REALIZATION AO GPRS WIRELESS TRANSMISSION MODULE

GPRS communication module is installed in the building energy monitoring data acquisition controller. Its main function is to connect to the Internet through the GPRS network, and take the initiative to establish communication link with the monitoring center. GPRS communication terminal transceiver module mainly consists of G24 module, antenna, SIM card, related level translator circuit and RS232 serial port.

G24 transceiver module uses AT command to operate and apply RS232 serial port for data communication [10]. First, the communication terminal module attaches to the GPRS network through SGSN node; and PPP (Point to Point Protocol) protocol get a randomly assigned IP address through GGSN node to connect to Internet; through the Internet, communication terminal module establish communication link with the monitoring center, according to port number which is set by monitoring center [II]. Software process is shown in Figure 3.

Figure 2. The control box

Figure 3. G24 Communication software process

schematic drawing

425

1) To test whether G24 communicate normally or not.

Firstly, selecting serial port and setting baud rate. Send

"AT", tithe module returns "OK", then the communication

is normal, or re-issued.

2) Access to Internet. When there is GPRS coverage,

send "A T+CGA TT= 1 " so that the module attached to the

GPRS network. Send the "AT+MIPCALL=1, cmnet" to

establish wireless communication with the GGSN through

P P P protocol.

3) Connect controller center. Send

"AT+MIPOPEN=<Socket ID>, <Source Port>,

< "Destination

Port >, <Protocol> " to

Address ">, <Destination

the module to establish

communication link with monitoring center. If return

"+mipstat: 1, 1 ". I{return "+MIPOPEN: Socket /D, 1", it

is illustrated that communication link with monitoring

center has been established. If return "+MIPSTAT: 1,1 ",

then it is illustrated that physical link is broken, and need

to re-connect [I 2].

4) Data transceiver. Sending data uses

"AT+MIPSEND=1, 'Data'; +MIPPUSH=1 ". This design

uses the G24 default encoding, and has to use ASCII code in

hexadecimal form. Once the data arrives, G24 module will

return "+MIPRTCP: <Socket ID>, <Left>, <Data>"

through RS232 serial port. If all the data has been received,

left is 0; "Data" which is received is the hexadecimal ASCII

code form.

5) Disconnect the communication link. Send

"AT+MIPCLOSE=Socket /D" to the module. if the module

returns "OK", the disconnection was successful. The core code of GPRS wirelessly automated data

collection part is to realize reliably and stably wireless energy consumption detection data transmission from field control layer to data center. Data center stores energy consumption data which is transmitted by GPRS into database, and display, analysis in the next step. Data center web-enabled map is shown in Figure 4.

Figure 4. WEB function figure

IV. SUMMARIZES

The article proposes building management platform for building energy consumption monitoring system combined

2011 2nd International Conference on Control, Instrumentation and Automation (ICCIA)

GPRS with RS485 bus technology. Analyze the feature and advantage of the system architecture and provide GPRS

core software and hardware implementations. The program can monitor electricity, water, heat and other energy parameters in public buildings by monitoring system. The program has been applied in Shenyang large public building energy consumption monitoring platform, system running in good condition.

The reserch be supported by fund and program of Housing and Urban Development of China (2010jsb;2011-kl-32;sjwlO-04).

REFERENCES

[1] Ministry of Construction, Breakdown of energy consumption data acquisition guidelines of state of lice buildings and large-scale public buildings energy consumption monitoring system[M] 2008

[2] Ministry of Construction, Breakdown of energy consumption guidelines for data transmission technology of state office building and large-scale public building energy consumption monitoring system[M] 2008

[3] Tsinghua University Building Energy Efliciency Research Centre (TUBERC). Annual report on China building energy efficiency[M],China Building lndustry Publishing Company. 2010

426

[4] Wang Jia, Yu JuQi, Wireless communication technology in the intelligent building energy consumption data acquisition application[J] Intelligent Building, 2008(7) 38-40.

[5] Zai Lei, Liu ShengDe, Hu XianBin, ZigBee technology and application[M], Beijing Aerospace University Publishing Company,2007.

[6] Ma ZenQiang, Van Van, Jing HaiMing. Study of GPRS-based data acquisition system[M]. Micro-computer lnfonnation,2005.

[7] Guan YaoWu, etc. lntensive reading of ARM Embedded wireless communication system development case [M]. Electronics Industry Publishing Company.

[8] Wang ZaiYing,ecl Intelligent Building Building automation system theory and application[M]. Electronics lndustry Publishing Company.

[9] Li Lian Y e, ecl Intelligent building engineering design and implementation[M]. China Electric Power Publishing Company,2006.

[10] Shen Yuan, Shi Zhan, Chen XiaoRong. Application of GPRS technology in remote data acquisition system[J], lnstrumentation Technology,2006( 6 ):27-28.

[11] Ma Bin, Zhang Na, Guo Qiang, Et A1. Application of C# serial port class between PC and IC card read- writer in serial communications[J]. Journal of Shenyang Jianzhu University : Natural Science, 2008,24(3): 508-511.

[12] Sriskanthan N , Tan F , Karande A. Bluetooth based home automation system[J]. Microprocessors and Microsystems, 2002, 26 (6) : 281-289