Abstract：

In response to the problem of treated dry bulb air temperature rising caused by adsorption/absorption heat in temperature and humidity independent control (THIC) air conditioning systems, which leads to low system performance and poor dehumidification effect, this paper conducts a theoretical study on a novel periodic adsorption-desorption type THIC air conditioning system. A mathematical model for the thermal and humidity performance of the system is established under the modes of dehumidification and cooling in summer and humidification and heating in winter, and the influencing mechanism of the system’s thermal and humidity performance is explored. The research results show that under the dehumidification and cooling mode in summer, as the outdoor temperature increases, the thermal performance of the system decreases, the humidity performance improves, and the comprehensive coefficient of performance of thermal and humidity decreases. With the increase of outdoor relative humidity, the thermal performance of the system remains basically unchanged, the humidity performance improves, and the comprehensive coefficient of performance of thermal and humidity increases. The change pattern of thermal and humidity performance of the system under humidification and heating mode in winter is opposite to that under dehumidification and cooling mode in summer. In addition, as the partial load rate increases, the thermal and humidity performance of the system decreases. Compared with the THIC air conditioning system based on rotary dehumidification, the comprehensive coefficient of performance of thermal and humidity of this system in summer and winter increases by 37.1% and 67.7%, respectively, indicating significant energy-saving effects of the system.

Keywords:periodic adsorption-desorption; temperature and humidity independent control; air conditioning system; thermal and humidity performance; dehumidification and cooling; humidification and heating; energy saving