| Summary: | 碩士 === 大同大學 === 機械工程學系(所) === 94 === Since the invention of calculators, the speed of calculation continued to increase and calculation costs continued to decrease. Through fluid mechanics CFD software calculations, more successful examples of indoor environment energy conservation have been reported. In Taiwan, more than 98% of energy supplies rely on imports. As domestic power use continues to increase, the shortage of power supply from Taiwan Power Company repeatedly exists in summer. Therefore tasks of saving energy and raising efficiency become top priority. How to use CFD software applications for reducing unnecessary energy consumption is an important issue for conservation energy.
This text has adopted commercial CFD software PHOENICES analysis in simulating flow field and temperature field distribution inside the convenience store for entrance with air curtain. Through this simulation the indoor air velocity and temperature are attained, and get the overall flow distribution and heat conduction direction inside the convenience store. Through onsite measuring to indoor air velocity value and temperature value for using numerical analysis. It shows that air curtain wind velocity intensity indeed affects indoor air-conditioning system energy consumption. When air curtain wind velocity is too strong, outside air and inside air will be the air curtain current, causing mixed cold and hot air indoor and affecting shopping comfort. When air curtain velocity is too weak, it is impossible to isolate the outside air from causing natural convection heat transfer, and to reduce indoor air-conditioning energy consumption.
The installation of air curtain can maintain the effect on the heat (Coldness) of the air. At same time it improves the comfortableness and saving of energy. If an automatic door is available, better air-conditioning system efficiency is facilitated. Inside experimentally simulated the convenient store open space measuring of 10.8m*6.8m*2.8m, after installing air curtain, There are use 5 levels are set to monitor energy conservation result. The experiment shows that when the air curtain is not installed, cold air loss is 5.87 kW, after the air curtain is installed with wind velocity set at 2m/s, the cold air loss is 3.47kW. To benefit it s energy conservation is 60% ~ 70%. Therefore, it shows that installing appropriate air curtain inside an open-type of convenience store space helps reducing long-standing operation of the air-conditioning system, recycles and regulates the temperature to achieve energy conservation results.
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