用于空调能量回收的板式脉动热管换热器

为提高脉动热管换热器在空调系统排风能量回收中的换热效率，提出了一种新型并联槽道板式脉动热管及由其组成的换热器。首先对单片热管在空调排风夏季工况下的能量回收情况进行了传热性能实验研究，影响因素包括槽道当量直径、充液率、工质种类、风速、风温、微倾角；然后对一组由7片热管顺排形成的板式脉动热管换热器的换热效率进行了计算。研究表明：新型板式脉动热管的适用工质为R141b，最佳充液率为25%；传热性能随新风温度及风速的升高而增强，新风、排风温差小于6℃时热管不启动；随风速增加，换热量增加，但换热效率有所降低；给定工况下板式脉动热管散热器的换热效率为44.1%；微倾角可使空调能量回收系统在保证良好换热效率的同时实现换季不换向，热管安装宜采用+2°左右的微倾角。

A plate pulsating heat pipe heat exchanger for air-conditioning energy recovery

In order to improve the heat transfer efficiency of the pulsating heat pipe heat exchanger(PHPHE)in the exhaust energy recovery of air conditioning system, a new type of parallel channel plate pulsating heat pipe heat exchanger was proposed. Firstly, the detailed research was carried out on the heat transfer performance of the single-chip heat pipe in the air-conditioning of exhaust energy in summer condition. The influencing factors include channel equivalent diameter, liquid filling rate, working fluid type, speed of wind and inclination angle. On the bases of the above, the heat transfer efficiency of the PHPHE formed by seven pieces of heat pipe in line was calculated. Results showed that R141b is an appropriate working fluid and the optimum filling rate is 25%. The heat transfer performance was enhanced with the increase of fresh air temperature and wind speed. The pulsating heat pipe almost cannot start up, when the difference between the indoor air temperature and the exhaust air temperature is less than 6℃. The heat transfer efficiency of the PHPHE is 44.1%. The micro-inclination angle can make this system keeping higher heat transfer efficiency without orientation changes in different seasons. The better installation angle is around +2°.