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LonWorks technology in the control of the heating system
s, communication distance up to 2700m, to fully meet the communication requirements of the control signal, without using repeaters to extend communication distance. Five Quarters heating control system shown in Figure 3. One by one one by one back to back 84 of 17 QINGDAO hot water back to the water volume V in Figure 3 quarters Heating Control System Figure 3 is a five dormitory heating system diagram. There are four five dormitory quarters. Hot water at each entrance of buildings on an electric control valve installation, installation of a backwater export thermal resistance sensor. 4 RTD temperature signal in the sensor nodes into a standard analog signal first, and then generate digital signal sampling, in accordance with the LonTalk protocol package output. The modulated signal transmitted through telephone lines to the boiler control room. Demodulated signal and then through the MODEM, serial network adapter into the ATM network. Points detected from the ATM network console each block building return water temperature signal, the PID operation have to import and export of the valve opening control signal. The signal into the ATM network, the serial network adapters and modems, through the modulation control signal through telephone lines back to five quarters, and then demodulated by the modem, to another node. In this node, the LonTalk protocol in accordance with the reassembled packets to analog control signals, sent to the electric control valve, control valve opening,air jordan shoes cheap, at any time adjust the water flow. This system ensures that each block of F return water temperature measured basic equal to the given temperature. If the floor of the return water temperature is below a given temperature, return water temperature measured through the field nodes, MO-DEM, phone lines, serial communication adapter,ugg prezzo, ATM network into the computer, through computer control algorithms, the output control signal, and then After another ATM network, serial communication adapter, telephone line, MODEM, electric actuator to reach the scene node, transfer large hot water valve opening, and finally to return water temperatures rise. When the return water temperature is higher than a given value,air jordans, the control signal is off a small hot water valve. Thus, the control system to ensure that the return water temperature of each Block F are consistent with the given value,ugg milano, there would be no significant difference in dorm room was. The control system of a dormitory with five quarters like, do not repeat them here. In engineering practice, the more mature products are the United States Echelon LonWorks (Echelon) the company's LonPoint systems, electronic information industry, the Ministry of R & D centers in six LCN-N systems, and building automation Chongqing Sichuan Instrument Company for a 2000 system for ART Select References: [1] East China Architectural Design Institute. Intelligent Building Design Technology [M]. Shanghai: Tongji University Press, 1996. [2] Li. Intelligent building system engineering [M]. Beijing: Electronic Industry Press, 1998. 3 Wei,ed hardy clothing, et al: IrODw. rks in the heating system control Ken 85THEAPPLYOFLONWORKSTECHNOLOGYONHEATINGSYSTEMCONTROLLIWei, LIQuanmin (ShandongInstituteofArchitectureandEngineering, Dept.. fInf0rmati. n & Electrica1Engineering, ji'nan250014, China) Abstract: Torealizetheautomationcontrolover-the. hLeaatningstyrsatnemiotndliarigtael-sisgcnaalels, adecpoenntrdoeldp. ronj. e1cttswchasarpaucttefroirs-a diwar, nwhichLonWorkstechnologywasusedandLantotransmQga. g spit uc children ... ... ... ~, ticsarethat, Lanusesstructure. ffreetopoi. gY. thecablingissimplicity, anditcanconnectwithmanytarheatingstati. nyphonewire, andachieVethec. ntrolc. vering1arge-extent �� Keywords: intelligentbuilding; aut. maticc. ntrol; b. iler; 1. nWorks; Heatingsystem
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