- 學位論文
冷凝熱回收應用於恆溫恆濕系統之節能效益分析
Analysis on energy-saving performance by applying condensed heat recovery to constant temperature and humidity system
摘要
本研究主要針對冷凝熱回收裝置對於恆溫恆濕系統之效益分析。實驗中架設一套恆溫恆濕系統，並將熱回收裝置應用於冷凍設備與空調設備進行探討，其冷凍設備中熱回收裝置是以套管式熱交換器的型式將冷媒與工作流體做熱交換的功用；空調設備中將原本電加熱裝置汰換為熱回收裝置，其中工作流體為水與三氧化二鋁奈米流體等樣本進行實驗；最後結合成為一套恆溫恆濕系統進行分析整體性能、節能效益及穩定度等。實驗結果顯示，使用奈米流體當作熱回收裝置之工作流體，在冷凍設備中，於不同環境溫度下，其COP最多可增進33.8%，壓縮機的耗功最多可節省15.8%；在空調設備中，不同負載下，無論是使用電熱裝置或熱回收裝置，都可經由一段時間達到穩態的趨勢，而使用熱回收裝置時，再熱過程的耗電量最多可節省97%；在恆溫恆濕系統中，於不同負載且能在穩態的情況下，使用熱回收裝置時之整體耗電量最多可降低38.2%，其中再熱裝置耗電量降低97.5%，壓縮機耗電量降低23.8%；因此，本研究所使用冷凝熱回收供給空調設備的再熱源確實可降低整體恆溫恆濕系統之耗電量。
並列摘要
The study mainly analyzes the beneficial effects of condensed heat recovery device on constant temperature and humidity system. A constant temperature and humidity system is mounted to conduct experiments of the study, and a heat recovery device is applied to a refrigeration equipment and an air-conditioning equipment to make further exploration. Regarding the heat recovery device in refrigeration equipment, heat exchange function between refrigerant and working fluid is performed through double-pipe heat exchanger. The original electric heating device in air-conditioning equipment is replaced by heat recovery device. In the experiments, the working fluid is a nanofluid with water and aluminum oxide (Al2O3). Finally, a constant temperature and humidity system is integrated to carry out analysis of its overall functions, energy-saving performance and stability. Experimental results show that after applying nanofluid as a working fluid of heat recovery device in refrigeration equipment under different environmental temperatures, its coefficient of performance (COP) can be increased by 33.8% maximum, and the power consumption of compressor can be saved by 15.8% maximum. In the air-conditioning equipment under different loads, no matter using electrothermal device or heat recovery device, steady trend can be achieved after a certain period of time. When heat recovery device is used, the power consumption during reheating can be saved by 97% maximum. In constant temperature and humidity system, when steady state is obtained under different loads, the overall electricity consumption during use of heat recovery system can be reduced by 38.2%, the electricity consumption of reheating device can be reduced by 97.5%, and the electricity consumption of compressor can be reduced by 23.8%. Therefore, the reheating source of the air-conditioning equipment supplied by the condensed heat recovery device, which is being used in the study, can really reduce the overall electricity consumption of the constant temperature and humidity system.