摘要
采用实验和数值模拟的方法,分析了太阳能系统中水箱内部流动与换热情况。换热水箱尺寸为450 mm×400 mm×500 mm,水箱内部中心位置布置15层螺旋管。太阳能系统产生的热水从螺旋管顶端入口流入,从底端出口流出。冷水从换热水箱下部入口流入,从换热水箱上部出口流出。对比2015年9月30日到10月3日连续4 d实验结果的平均值与数值模拟结果,换热水箱内部中心温度两者最大误差为5.1%,冷水出口温度两者最大误差为2.1%。实验和模拟研究发现:冷水进口质量流量在0.03~0.1 kg/s内,冷水温升为10~15℃;换热水箱内部温度分层现象明显,有利于获得较高的出水温度。
The flow and heat transfer in the solar system water tank were investigated by experimental and numerical simulation.The water tank size was 450 mm × 400 mm × 500 mm,and 15 layers of spiral pipe were involved in it.The hot water produced by the solar energy system flowed from the top inlet of the spiral tube to the bottom outlet,while the cold water flowed from the bottom inlet of the water tank to the top outlet.Comparing the experimental results from October 3rd to September 30,2015 with numerical simulations,the maximum temperature deviation in the center of the tank was 5.1%,while it was 2.1% on the cold water outlet.The study presented that the cold water temperature increased around 10 ~ 15 ℃ when the mass flow rate of the inlet cold water was in the range of 0.03 ~ 0.1 kg/s.It also showed that there was significant temperature stratification in the water tank,which was beneficial to obtain higher outlet temperature from the water tank in the solar energy system.
出处
《能源工程》
2017年第2期43-47,70,共6页
Energy Engineering
基金
国家质量监督检验检疫总局科技计划项目(2015QK036)
榆林市重点研究计划项目(2015JH-30)
关键词
太阳能系统
水箱
实验与数值模拟
solar system
water tank
experimental and numerical simulation
