Research On Performance And Chilled Water Variable Flow Control Of Internal-combustion Engine Energy Independence System

Internal-combustion Engine Energy Independence (ICEEI) system was put forward on the basis of energy cascade utilization conception. It is inheritance and development of gas engine heat pump technology and internal combustion engine heat pump technology, and is also a specific application form of energy cascade utilization theory. Theoretical and experimental study was conducted on performance and chilled water system control of ICEEI system, the main research contents are as follows:(1) The concept of ICEEI system was put forward. Fuels used by ICEEI system was studied from both thermodynamics and economics two aspects. Concept of convert performance coefficient was defined which can be used to measure energy utilization efficiency. After influence degree of independent variable to conversion performance coefficient was identified and fuel costs of ICEEI system was studied, introducing life cycle method, cases of typical buildings were analyzed. Then conclusion was got that marsh gas and natural gas have priority over others as fuels of ICEEI system.(2) Experiment table for performance research of ICEEI system was established, and experiments were carried on. The experiments involve three parts: internal-combustion engine characteristics experiments, recovery of waste heat experiments, and overall characteristics experiments of ICEEI system. The results show that the primary energy utilization rates of this system are almost above 1, that is, this system has excellent variable working condition performance and higher energy utilization efficiency.(3) Coustic enclosure with ventilation system were designed in this article and installed on the engine and the compressor to resolve problems of huge heat productivity, complicated noise spectrum characteristics and excessive noise during operational process. Simulations had covered the air temperature and velocity field in the coustic enclosure. Experimental results show that this control method can make the heat drained away in time that guarantees the engine and the compressor's safe operation. Combining the previous research results of our team, we can see that the noise reduction measures make a sharp fall in the noise and meet the design requirements well.(4) From the perspective of heat-transfer mechanism, mathematical model of the room cooling load, fan-coil model, implementation model, sensor model and the chilled water system model were established on the basis of thermolynamic theory, and transfer function of all the models were obtained. Aims at ICEEI system, three controllers were designed, including PID control, fuzzy control and fuzzy adaptive PID control. Using the three controllers established, the chilled water system control was simulated.(5) Construction work related experiment table of chilled water system's variable flow control were completed and the variable flow control experimental program was established also. Combined with demonstration project, the pump regulation problems were analyzed, and the pump shaft power variation range were concluded, providing an important basis for the generating system design of ICEEI system. Utilizing the experiment table, the variable flow control experiments were done.