دانلود رایگان مقاله انگلیسی بررسی عملکرد مبدل حرارتی کلی بازسازی شده با جریان دوره ای - نشریه الزویر

Abstract

This study proposes a new regenerative type of the periodic total heat exchanger system, which consists of four centrifugal fans and two fixed wheels. The total heat exchanger, which operates periodically to replace the rotation of the fixed wheel in conventional design, can save more energy from motors. The fixed wheels alternately store and release energy using the heat and moisture storage materials of aluminum and silica gel. The operation periods are 2 minutes, 3 minutes, 4 minutes, 6 minutes, and 8 minutes. The results show that under the temperature and humidity ratio differences of 10℃ and 4 g/kg between indoors and outdoors, the operating period of 3 minutes has the best performance of sensible heat effectiveness, latent heat effectiveness, and total heat effectiveness. When the temperature and humidity differences increase, the optimal operating period becomes shorter. In order to increase heat effectiveness, adding another high temperature and low moisture air for regeneration in the total heat exchanger increases the latent heat effectiveness, but the sensible heat effectiveness decreases. Keywords: Periodic total heat exchanger, Storage material, Operation period.

4. Conclusion

In this paper, the total heat exchanger, which operates periodically to replace the rotation of the fixed wheel in conventional design, can save more energy from motors. Energy storage materials were added in the periodic total heat exchanger to improve its performance. A series of experiments were conducted to investigate the new design, and the results indicated three main findings. First, under the temperature and humidity ratio differences of 10℃ and 4 g/kg, the best performance of each heat effectiveness is at the operating period of 3 min. Sensible heat effectiveness is the highest value at 80%. This level of effectiveness is similar to that of commercial products. Second, when the temperature and humidity differences increase, the optimal operating period becomes shorter. Third and finally, adding high temperature, low moisture air to regeneration in the total heat exchanger increases latent heat effectiveness but decreases sensible heat effectiveness.