真空泵浦於空調上雙效熱泵應用效益之研究

Abstract

本研究依據水在真空下汽化所得的潛熱來製冷，如果在真空下只有水被汽化，意即只有水汽會通過真空微壓縮泵浦，則100%水汽在通過真空微壓縮泵浦後，可以利用冰水將水汽冷凝回液態水，水汽分子被冷凝回液態水後，這空間裡就產生了真空狀態，所以利用完全水汽被冷凝的現象，可以製造出免費的真空，而本論文設計使用20oC的冰水來冷凝真空微壓縮泵浦出口的水汽，主要原因是一般淺層溫能所提供的水溫為20oC~22oC，這樣可以用真空汽化加上淺層溫能來達到零碳及節能效果。 本論文分為單獨真空制冷系統及雙效熱泵真空系統研究與分析兩大部分。 首先，本研究開發一套結合淺層溫能冰水及真空系統來製冷，可以達到節能減碳的效果，此套單純系統採用20oC淺層溫能冰水可提高系統冷卻能力， 第二部分為真空雙效熱泵系統，系統的組成包含一結合真空微壓縮泵及冰水來製造免費的真空，除了製冷外，可將冰水加熱到30oC，再將高溫水拿去使用其熱能，降溫後，部分迴流到真空蒸發槽，來補充被蒸發的水分。

In this research, we use the latent heat principle that liquid type water can be cooled by neighbor liquid water molecular vaporization under vacuum. In vacuum chamber only water will be vaporized. It means that 100% water vapor will pass through light-duty vacuum compressor. At the exhaust of vacuum compressor, it will be only 100% water vapor. If we could use liquid cooling water to condense this 100% water vapor, then 100% water vapor will become liquid water at the exhaust. It means that no gas was found at the exhaust. Therefore, we could consider that condensation is actually a free vacuum pump if the loading is only water vapor. We purpose to use cooling water from shallow geothermal energy. Most of the case from shallow geothermal energy we can get 20 oC ~22 oC cooling water from underground. We design to use 20oC cooling water to simulate shallow geothermal energy cooling water to condensate the vapor at the exhaust of the vacuum compressor. With this combined system we aimed to achieve zero carbon and energy saving. We design two kind of vacuum cooling systems in this research. One is only vacuum cooling and recycle water vapor by cooling water. The other one is to create vacuum cooling and exhaust hot water at same time. The first system focus on vacuum cooling efficiency and exhaust hot vapor gas will be recycled by shallow geothermal energy cooling water. In this design we try to achieve better cooling efficiency as a simple model. The second system is to make cooling and heating at same time. We create cooling by vacuum, and we use exhaust heat to increase cooling water temperature above 30oC. Finally, we feedback the condensate back to vacuum cooling chamber.