石蜡复合混凝土太阳能相变蓄能炕系统的热性能研究

Study on solar-energy phase change storage kang Composited by paraffin and concrete

设计了一种以相变材料石蜡与混凝土相结合相变蓄能炕采暖系统,并将其与传统火炕、纯混凝土炕和纯石蜡炕进行了对比分析.在供热温度35℃、供热流量0.95L/min实验条件下,测试了系统炕面温度、石蜡温度、进出口温度和炕面热流密度等参数.实验结果表明:石蜡混凝土炕面温度分布均匀,其炕头、炕中和炕尾温度无明显差异,供热效果与纯石蜡炕相近,且系统初投资比纯石蜡炕节省了30%.石蜡混凝土炕面平均温度为33.29℃,比传统火炕高10℃,炕面降温速率却仅为传统火炕的15%.与纯混凝土炕相比,由于结构不同,石蜡混凝土炕体在炕面平均温度、夜间温度下降速率、炕面热流密度和供回水温差特性上均优于纯混凝土炕.

The phase change storage kang heating system is designed by using phase change material composited by paraffin and concrete(Paraffin-concrete),and comparisons have been made of the new heating system with the traditional kang,pure concrete kang and pure paraffin kang.At the set temperature of 35℃and the flow rate of 0.95 L/min,the temperature of each monitoring point is measured.The results show that the paraffin-concrete kang surface temperature is evenly distributed,heating effect is remarkable same as pure paraffin kang,and 30%initial investment can be saved compared with the pure paraffin kang.Paraffin-concrete kang surface average temperature can reached 33.29℃,10℃higher than the traditional kang,paraffin-concrete kang surface cooling rate is only 15%compared with traditional kang.For the characteristics of kang surface temperature,temperature cooling rate in the night,kang surface thermal flux and temperature difference between supply and back-water pipes,the paraffin-concrete kang is better than the pure concrete kang due to the different structures.