| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 96 === The multi-functional heat pump water heater is a device combining the functions of the heat pump and the water heater, exhibiting multiple operation modes, the capability of simultaneously meeting the needs for the hot water and the cold room, and advantages of highly cleaning efficiency, safety, and convenience, thus very suitable for Taiwan’s weather conditions, energy trends, and environmental requirements. The multi-functional heat pump water heater is the profit-making instrument. Therefore, developing machineries of high functionality, decreasing operational costs, and enhancing competitiveness are the imminent priorities. Currently, the functions of the multi-functional heat pump water heater are all measured according to the concept of the First Law of the Thermodynamics (COP). Such only makes the overall efficiency of the system but not the energy efficiency of the system’s each component known, causing the inability to indicate the improvement directions for the system during the development process.
The primary purpose of the research study is to develop the theoretical irreversibility analysis model for its application to each operation mode system and component function of the multi-functional heat pump water heater, as the diagnostic tool for finding the most optimal improvement options during the development process. Then, the testing data of a series of machinery development cases (prototype and five subsequent improvement cases) will be utilized to verify the compatibility of the diagnosis models. Last, the most optimal development option will be determined according to the cost-effect analysis.
The results indicated that the utilization of the functionality diagnosis methods developed from the theoretical irreversibility analysis model exhibited a high degree of suitability for the assisted identification of the most optimal improvement plan for the multi-functional heat pump water heater during the development process. The functionality diagnosis results for each model of the Prototype A indicated that the compressor exhibited the highest degree of irreversibility, followed by the coil, expansion valve, condenser, and evaporator. Subsequently, five improved machinery sets –B, C, D, E, and F were developed. The functionality diagnosis results revealed that the machinery sets employing the functionality improvement of the compressor in junction with the coil、condenser and evaporator as the foundation exhibited much more significant improvements. In conformity with the cost-effect analysis (COP cost), it clearly indicated that the testing machine E was the most optimal development option. The functionality diagnosis method constructed by the research study for the multi-functional heat pump water heater can provide a diagnosis instrument for the subsequent heat pump water heaters of various capabilities or similar functions during the development process.
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