| 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 === Ever-increasing energy consumption and rising environmental awareness have triggered a rapid growth in the number of researches on the more effective utilization of natural energy resources, such as recovery of industrial waste heat. Energy storage systems play a crucial role in effective utilization of energy resources. Storage of cold energy during off-peak hours for use during the peak hours in daytime, for example, helps save electricity and reduce the need of building new power plants. Moreover, using natural, pollution-free solar energy can be used to effectively store heat energy in water as an alternative replacement of traditional gas or electrical water heater. heater. Relying on the changes in liquid phases to transmit heat energy, heat pipes also boast the advantages of effective heat transfer and low cost, and passive design further endows heat pipes with admirable reliability and great potential of serving as energy storage systems.
The study accordingly develops a closed loop thermosyphon energy storage system to store energy in water by absorbing heat energy with its evaporation end and releasing heat energy with its condenser. Under different heating capacities, three types of evaporation pipes – smooth pipe, meshed tube, and sintered tube – are used to perform an experiment for verifying the average energy storage efficiency of the developed system. Additional experiment parameters include the working fluids (water and ethanol) and the system’s filling rate. In conducting the experiment with multiple controllable factors, the Taguchi method is used with the hope to achieve the same results as an all-factor approach with the minimum number of experiments. Experiment results are analyzed by Signal/Noise ratio so as to trace the relationship between the experiments and to identify the better parameters for the closed loop thermosyphon experiment.
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