Research on Energy-Saving of New Type Low-Temperature Air Flow Dehumidification System Based on Exergy Analysis Method

Abstract

Currently two humidity control methods, namely liquid desiccant and rotary wheel dehumidification, are commonly used to handle humid fresh air. For these two methods, a large amount of heat would be consumed in the processes of solution regeneration and adsorbent regeneration, which results in a serious waste of energy. This paper deals with a new type low-temperature airflow system, which was combined with an ice-storage device. Based on exergy balance model, its performance parameters, such as the cooling load, energy consumption and exergy efficiency, were calculated and compared with those of a rotary wheel dehumidification system and a liquid desiccant system under the same conditions according to experimental data of a practical project in Guangzhou. The calculation results show that the exergy efficiency of new type low-temperature airflow system is higher than that of the rotary wheel dehumidification system by 96.14% and higher than the liquid desiccant system by 40.31%, which conditionally means the proposed low-temperature airflow dehumidification system has much better performances.