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The Research and Development of the Control System for the GSHP Plant Room

Author: LinZe
Tutor: AnDaWei
School: Tianjin University
Course: Heating, Gas Supply , Ventilation and Air Conditioning Engineering
Keywords: GSHP control system for the plant room PID by-pass
CLC: TU85
Type: Master's thesis
Year: 2007
Downloads: 120
Quote: 0
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Abstract


Although there are more than ten years since the GSHP was used in our country, compared to the technology of the traditional refrigeration system, this period is not much long. The paper about the control system for the GSHP is seldom. Because the technology of control system for the traditional refrigeration has been uesed for a long time, referenced to it, we can research and develop the control system for the GSHP.The GSHP has its own characteristics. Its control system must be special. The characteristics of control system for the traditional refrigeration are in the beginning of this paper, and based on this I put the characteristics of the GSHP, the control strategy for the GSHP, the method of selecting setting and installation of the sensors and actuators. Next the requirements and blue prints for control system for the GSHP are followed. In the end the control system for the GSHP with the technology of computer and automation is researched and developedThis control system used the technology of MCU, data collection, the PID arithmetic, asynchronous serial communications, visual basic 6.0, database etc. The main functions are collecting the data of the GSHP plant room; using the PID control method to control the degree of the opening of the valve on the by-pass which between the cold-water collecting header and supply cold-water distribution header, and control the degree of the valve opening that between the cool-water collecting header and supply cool-water distribution header, sharing the data with PC. The PC can set the parameters of control system, save all the data which making the analysing of this system more conveniently in the future.The last part of this paper is the the performance of this GSHP with the data which is saved by this control system. The results indicated that this control system of GSHP plant room can reflect the situation of this GSHP running, and can adpated according to the changes of the load. The conclusion is that this control system has achieved the aims of the design.

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