In recent years, the high - efficiency and energy - saving products launched by Tian'er Machinery, such as the stainless - steel environmental - friendly plate - heat - exchanger series dryers, intelligent refrigerated air dryer controllers, and frequency - conversion refrigerated air dryers, have been well - received by the market. In particular, its TRV series frequency - conversion refrigerated air dryer adopts DC frequency - conversion technology, reducing energy consumption by more than 30% compared with traditional products. The minimum operating power is only about 20% of that of the power - frequency refrigerated air dryer. The electricity cost saved in one year can be close to or cover the cost of the dryer. In addition, this series of refrigerated air dryers also has an intelligent adjustment function, which can automatically adjust the compressor frequency according to the working conditions, and has a complete self - diagnosis function, making the operating status clear at a glance.