Abstract：

In the existing air conditioning system with temperature and humidity independent control (THIC), there are problems such as the increase of air dry-bulb temperature caused by adsorption/absorption heat, the decrease of system performance, and the limitation of dehumidification and cooling effect. For this reason, this paper tests and theoretically studies a new periodic adsorption-desorption type outdoor air conditioning system based on heat and humidity synergistically handling. The performance of the system in the dehumidifying and cooling mode in summer and the humidifying and heating mode in winter is tested. The enthalpy function mathematical model of the system’s heat and humidity performance is established, and the influencing mechanism of the system’s heat and humidity performance is investigated. The study results show that the new periodic adsorption-desorption type outdoor air conditioning system based on heat and humidity synergistically handling can effectively process outdoor air into the set temperature and humidity range, and as the temperature or relative humidity of the outdoor air increases, that is, as the enthalpy of the outdoor air increases, the dehumidifying and cooling performance of the system is improved. On the other hand, as the temperature or relative humidity of the outdoor air decreases, that is, as the enthalpy of the outdoor air decreases, the performance of the system in humidifying and heating is improved. In the summer dehumidification and cooling mode, the refrigeration COP of the outdoor air conditioning system is higher by 10.7% to 253.2% than that of the traditional dehumidifying outdoor air conditioning system, and the energy-saving effect is significant.

Keywords:periodic adsorption-desorption; heat and humidity synergistically handling; enthalpy function; outdoor air conditioning system; dehumidifying and cooling; humidifying and heating; coefficient of performance (COP)