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Design of Control System Based on Fountain and Water Resource Heat Pump Cooling Water

Author: PangZhaoLei
Tutor: WangLei
School: Shandong University
Course: Control Science and Engineering
Keywords: Central air conditioning system Water Source Heat Pump Fountain Energy saving Control system
CLC: TP273
Type: Master's thesis
Year: 2011
Downloads: 14
Quote: 0
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Abstract

Energy issues was increasingly prominent. Confronted with the great challege for the energy problem, we had paid increasing attention to the energy consumption of central air conditioning. New Museum building, which was in Jinan City, Shandong Province,used central air conditioning system to refrigerate in summer. Taking the building area into account, the central air conditioning system was designed with big scale, and this design required lots of cooling towers to work. Limited by the building and humanistic factors, the cooling towers couldn’t be used in the central air conditioning system. Besides, central air conditioning system was generally designed to run with the maximum design load, and it was often at full capacity when running. So, it was a large power consumption when cooling towers were employed. In most part of the running time, air conditioning system load was less than its design specifications, the more cooling towers were used,the more power which was wasted. According to these problems, a plan to use fountain water source heat pump instead of cooling towers was introduced in this thesis, and a control system based on the scheme was developed.In this thesis, the architecture and principle of the central air-conditioning system is researched, and the energy saving potential based on all parts of the central air conditioning system was analyzed. The working principle of cooling water circulation and cooling towers was discussed. Then combining with the Museum Building factors, the plan of replacement wan designed, the pool and fountain work as the cooling towers of the central air conditioning system to cooling the water, besides, a control system based on the replacement was designed. The whole control system was divided into three parts:Management Center, Energy Management Server layer and Monitoring and Control layer. The control system is responsible for collecting real-time information of the water in the pool, and controlling the fountains to ensure heat dissipation requirements. In order to facilitate the application, the Monitoring and Control layer controller was designed for General Purpose controller, and a improved program-updating was adopted, which reduced the difficulty in testing and debugging. After the system completed, trace debugging was carried out about the sub-sectors of the control system, and the date were recorded and analyzed.Analysis of the data showed that, firstly, the replacement of cooling tower design was feasible, the heat dissipation of the pool and the fountains could afford the requirements of the central air conditioning system. Secondly, the communication of the control system network was accurate, and the controllers of all the layers were security and stability when running. Thirdly, the water in the pools could store energy at night, which could supply the central air conditioning system energy requirement of the next day, with 20 percents energy could be saved at least. To sum up, the replacement method and the control system was suitable for the central air conditioning energy saving.

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