1, expander efficiency: when the expansion air volume increases, the positive flow air volume will be reduced accordingly. This will lead to a reduction in the heat load at the cold end of the main heat exchanger, and the cold volume moves up to the hot end, making the cold volume at the hot end excessive, which in turn causes the temperature difference between the hot ends of the main heat exchanger to increase.
2. molecular sieve adsorber: the performance of the molecular sieve adsorber directly affects the adsorption effect of moisture and CO2 in the air. When the molecular sieve adsorber has problems such as insufficient filling volume, uneven bed, incomplete regeneration of molecular sieve, poor adsorption performance, structural defects or leakage, it will lead to short-circuiting of air and affect the adsorption effect. Poor adsorption effect will lead to an increase in moisture and CO2 content in the air entering the main heat exchanger, which in turn will cause the temperature difference and resistance of the hot end of the main heat exchanger to rise, affecting the performance of heat transfer.
3. Run cold loss: run cold loss is too large, will lead to the main heat exchanger hot end temperature rise, affecting the heat transfer efficiency.
4. heat exchanger design and structure: fin spacing has a significant impact on heat transfer performance. Under specific conditions, the fin spacing can be reduced to increase the heat transfer area and improve the heat transfer efficiency. But too small fin spacing will also increase the flow resistance, so it is necessary to optimize the design according to the actual situation. The number of tube rows and the selection of tube diameter will also affect the heat transfer performance. An increase in the number of tube rows can increase the heat transfer area, but will also increase the flow resistance and pressure drop. The choice of pipe diameter needs to consider the balance between heat transfer efficiency and pressure drop.
