Study On Flexible Experimental Platform For Small-scale Refrigeration Equipment

Because of the characteristics of high-performance, energy saving, inverter air conditioner has become the major developing direction of air-conditioning. At present, for inverter air conditioner product development, the development process of refrigeration system and electric control system was relatively isolated, which is difficult to guarantee the development schedule and performance quality leading to heavy experiments workload and long development cycle. How to accelerate the development of inverter of inverter air-conditioning product has become the important research topics for enterprises to vying for market share and improve the efficiency.A flexible experimental platform for small-scale refrigeration equipment which is modular and replaceable was presented. The experimental platform realized control of charged components of small-scale refrigeration equipment, collecting and analyzing various parameters during the experimental process. Achieving the optimal design of refrigeration system, and directly implement its control function on the platform. Obtaining various parameters required for dentifying and improving control strategies. So as to short product development cycles and improve quality.Through research the development process and laws of refrigeration equipment, combined with the inverter air conditioner product standard and test method of our country, the hardware design of the platform was first put forward. Details of its system design process and working principle. The hardware system includes computers, programmable logic controller (PLC), inverter, input capture module, output control module and so on, realizing collection and process of the experimental data, controlling of compressors, electronic expansion valves, blowers and other components.According to research and development needs, the general features and design of software frameworks and structures was presented. The ControlStar integrated development environment (IDE) was used in subordinate computer for software design, realizing the management of hardware system. According to the design of object-oriented software design ideas, all use cases was detailed designed through the Unified Modeling Language (UML) on the system. In .NET developing environment, software design of interface display, data processing, control algorithms and performance analysis was realized. The system database was developed by SQL Server 2005 in order to storage the experimental data. Data access was completed by ADO.NET, Linq to SQL, etc.In the analysis of existing control strategies for inverter air conditioners, various control algorithms which was suitable for inverter air conditioners microprocessors and met the practical requirement of product development was proposed. Designers could call, modify, observation, research these algorithms so as to meet the requirements of controller design type. The module of fault diagnosis and performance analysis was designed. Rule-base expert system diagnostic analysis method which realizing the optimization of refrigeration system was proposed.At last, the experimental platform was debugged and summed up the work. A number of recommendations were proposed for the inadequacies. Experimental results show that the platform implements the various functions required by the subject.