Performance Study Of Solar CPL/LHP Flat-Plate Collector Evaporator

In this thesis, the new solar CPL/LHP flat-plate collector evaporator was researched by experiments firstly, and the phase interface and temperature field inside were studied by simulation. The study provided a reference for the design and optimization of the new solar CPL/LHP flat-plate collector evaporator. The main contents are as follows:(1)The solar CPL/LHP flat-plate collector evaporator was designed, and the experimental apparatus was set up. The pressure loss of the experimental apparatus was checked in the thesis. The results show that: The maximum capillary force of the flat-plate collector evaporator is 2400 Pa, when the heating power Q≈1160W, the pressure loss of the system is about 2400 Pa, reaching the capillary limit of the flat-plate collector evaporator.(2)The start-up performace, variable power operation and the anti-gravity properties were studied in the thesis. The results show that: when the heating power is in the scope of 200W-700 W, the flat-plate collector evaporator has a good start-up performance; with the sustained changing power and random changing power, the flat-plate collector evaporator also has a good start-up performanc; and the anti-gravity height has nothing to do with the heating power.(3)The failure mode of the new collector was studied, the results show that: if the resistance of the steam side is too large and the non-condensable gas in the flat-plate collector evaporator is excessive, it will lead to make the working fluid flow back into the flat-plate collector evaporator, the system fails finally; if the heating power reaches the boiling limit of the flat-plate collector evaporator, the working fluid will be dried out, the system fails finally.(4)The heat transfer performance of the flat-plate collector evaporator was studied by experiment, the results show that: with the heating flux increasing, the heat transfer coefficient increases firstly, then drops. when the heating flux reaches 14 kW / m2, the heat transfer coefficient reaches 9kW/(m2·K); when the heating flux is more than 14 kW / m2, the heat transfer coefficient drops gradually.(5)The phase interface and the temperature field in the flat-plate collector evaporator were studied by simulation. The results show that: with the thermal conductivity of different materials increasing, the vapor-region expands gradually; with the heating temperature increasing, the inlet temperature and the radio of the fin and the channel increasing, the vapor-region expands gradually; with the porosity increasing, the vapor region reduces gradually, but not significantly.