The performance of a novel two-stage indirect/thermoelectric assisted direct evaporative cooling (i.e. IEC/TDEC) system is studied by using experimental and numerical simulation methods. In the IEC/TDEC system, the outdoor air is firstly pre-cooled in the first stage cross-flow regenerative IEC to make full use of the nature cooling source, and then further cools down in the second stage TDEC. An experimental set up is designed and built to investigate the influences of main operation parameters (i.e. operating current and number of TEC modules, inlet temperature, humidity and velocity of primary air, the mass flow rate ratio of regenerative air to primary air in the IEC, and also the mass flow rate of cooling water in the TDEC) on the system performance. It is found that the outlet air temperature and relative humidity could be conditioned to meet the comfort demand by adjusting the influential operating parameters. The dew point efficiency could be higher than unity, and the air moisture content increases or decreases dependent on given working conditions. The numerical model of the IEC/TDEC system is established, and validated by comparing with experimental results. The numerical results agree well with experimental results with relative errors within ±10%. Then, the working parameters of TEC modules and several mass flow rate allocation ratios of air are optimized theoretically by using the numerical model. Analytical results show that in the premise of a certain dew point efficiency, a maximum coefficient of performance can be obtained by adjusting the operating current and number of TEC modules. Moreover, the inlet velocity of primary air and two main mass flow rate allocation ratios of air can be optimized to achieve higher system performance.

通过使用实验和数值模拟方法研究了新型两级间接/热电辅助直接蒸发冷却（即 IEC/TDEC）系统的性能。在IEC/TDEC系统中，室外空气首先在第一级错流蓄热式IEC进行预冷，充分利用自然冷源，然后在第二级TDEC进一步冷却。设计并搭建了一个实验装置来研究主要运行参数（即运行电流和TEC模块的数量，一次空气的入口温度、湿度和速度，IEC中再生空气与一次空气的质量流量比）的影响。 ，以及 TDEC 中冷却水的质量流量）对系统性能的影响。结果表明，通过调节有影响的运行参数，可以调节出风温度和相对湿度以满足舒适度需求。露点效率可能高于 1，空气水分含量根据给定的工作条件增加或减少。建立了IEC/TDEC系统的数值模型，并通过与实验结果的对比进行了验证。数值结果与实验结果吻合较好，相对误差在±10%以内。然后，利用数值模型对TEC模块的工作参数和空气的几种质量流量分配比进行了理论上的优化。分析结果表明，在一定的露点效率的前提下，通过调整工作电流和TEC模块的数量可以获得最大的性能系数。此外，可以优化一次空气的入口速度和空气的两个主要质量流量分配比，以实现更高的系统性能。