地源热泵与螺旋管式相变蓄热耦合系统的实验研究

EXPERIMENTAL STUDY OF PHASE CHANGE HEAT STORAGE PROCESS WITH SPIRAL PIPE IN GSHP SYSTEM

针对地源热泵供热节能及不同地区峰谷电价政策,设计并搭建与地源热泵耦合的螺旋管式相变蓄热实验台,并进行实验研究。通过监测蓄热装置工作参数及螺旋圈内、外,螺旋圈之间相变材料的温度场、蓄热过程发生相变的过程等,分析相变材料的蓄热特点和不同工况对蓄热过程的影响。结果表明,螺旋管周边相变材料发生相变的速度最快,且可成导热与自然对流的耦合作用,自然对流对相变过程的影响最大。因此蓄热装置中的螺旋管应尽量放置在下部,可提高相变材料蓄热效率,缩短蓄热的时间,节约能源。

Phase change heat storage test bench with storage process also has been studied. Heat storage influence of inlet water temperature to heat storage spiral pipe has been design and built. Phase change heat characteristics of phase change material （PCM） and the process have been analyzed through measuring the inlet temperature, outlet temperature, PCM temperature inside of the spiral circles, PCM temperature outside of the spiral circles and between the spiral circles. The results showed that the paraffin near the spiral copper pipe melts first. The paraffin melting speed is slow down gradually from top to bottom because of heat convection. Spiral pipe should be fixed up close to the bottom as far as possible. The utilization ratio of PCM is improved. The influence of inlet water temperature melting speed of paraffin. is important to the temperature difference between inlet and outlet temperature and to the The higher the water temperature of inlet, the faster the melting speed of PCM is.