太阳能烟囱-地埋管耦合系统连续自然通风可靠性实验研究
郑迪萌,龙天河,叶 恺,卢 军,李永财

(重庆大学 土木工程学院,重庆 400045)

太阳能烟囱; 土壤-空气换热器; 自然通风; 实验测试

Experimental research on the reliability of continuous natural ventilation of SC-EAHE coupled system
ZHENG Dimeng, LONG Tianhe, YE Kai, LU Jun, LI Yongcai

(School of Civil Engineering, Chongqing University, Chongqing 400045, China)

solar chimney; earth-to-air heat exchanger; natural ventilation; experimental study

DOI: 10.15986/j.1006-7930.2021.06.005

备注

作为利用地热能和太阳能的两种典型技术,土壤-空气换热器(EAHE)和太阳能烟囱(SC)已被深入研究和广泛应用.将两者合理结合,利用太阳能烟囱产生的热压,可以取代风机为EAHE中空气的流动提供驱动力,再将室外新鲜空气引入室内,同时降低建筑能耗.作为全被动式系统,SC-EAHE系统性能取决于当地的土壤蓄放热能力和天气状况,为了研究连续自然通风时,不同天气条件下耦合系统的可靠性,以及其对室内热环境的影响,利用全尺寸实验台,对SC-EAHE系统的相关性能参数及室内空气温度进行了为期一周的连续测试.实验结果表明:耦合系统在夏季可以维持可观的自然通风量和制冷量,在太阳辐射充足时,风量最大值为230～280 m3/h,制冷量最大值为600～800 W; 在太阳辐射强度较低时,风量和制冷量的峰值分别为170～220 m3/h和400～600 W; 地埋管出口空气温度为25.8～27 ℃,相对湿度为9.1%～84.1%,波动幅度比室外空气分别减小了93.48%和53%; 实验房间平均温度比对比房间降低2.5 ℃,室温波动降低48.2%; 系统连续运行后土壤温度升高0.8 ℃,在自然状态下需要6 d恢复到初始状态.
As two typical techniques using geothermal and solar energy, earth-to-air heat exchanger(EAHE)and solar chimney(SC)have been deeply studied and widely used. If these techniques are put in combination reasonably, the buoyancy produced by solar chimney can drive air flow in EAHE, which will introduce fresh air into room and reduce building energy consumption. As a totally passive system, the performance of SC-EAHE coupled system depends on the heat storage and release capacity of local soil, and weather condition. In order to test the reliability of the coupled system under different weather condition during continuous natural ventilation and the influence of the coupled system on the indoor thermal environment, this study conducts a week-long continuous test of relevant parameters and indoor temperature through a full-scale experimental platform. The experiment results show that the coupled system can keep considerable ventilation air rate and cooling capacity in summer. When the solar radiation is sufficient, the maximum of air rate and cooling capacity is respectively 230～280 m3/h and 600～800 W. When the solar radiation intensity is low, the peak values of air volume and cooling capacity are 170～220 m3/h and 400～600 W respectively. The temperature and relative humidity of outlet air of the buried pipe is respectively 25.8～27 ℃ and 9.1%～84.1%. The fluctuation range is respectively reduced by 93.48% and 53% compared with outdoor air. The average temperature of the test chamber is 2.5 ℃ lower than that of the reference chamber, and the fluctuation of the room temperature is reduced by 48.2%. The soil temperature rises by 0.8 ℃ after continuous operation of the system and it takes 6 days to recover to the initial state in the natural state.