采用多通道直冷板的两相循环冷却系统实验研究

Experimental Investigation on Two-phase Circulation Cooling System with Multi-channel Direct Cooling Plate

本文搭建了以R1233zd(E)为工质的多通道直冷板两相循环冷却系统,并在冷凝温度为10、15、20℃,质量通量为147~882 kg/(m^(2)·s),热流密度为7.73~39.75 kW/m^(2)工况下对系统热力学循环和冷却性能进行实验研究。实验结果表明:质量通量上升,出口制冷剂焓值降低,热流密度上升,蒸发压力与出口制冷剂焓值升高。不同热流密度下冷板壁面温度随质量通量的变化趋势有所不同:当热流密度为7.73 kW/m^(2)时,制冷剂质量通量由147 kg/(m^(2)·s)增至735 kg/(m^(2)·s),局部壁面最大温差由2.9 K降至1.6 K;当热流密度为39.75 kW/m^(2)时,局部壁面最大温差由3.6 K增至5.2 K。不同质量通量下,表面传热系数随热流密度增加有不同幅度的升高:质量通量为147 kg/(m^(2)·s)时,表面传热系数由1843 W/(m^(2)·K)增至4528 W/(m^(2)·K);而质量通量为588 kg/(m^(2)·s)时,在相同条件下表面传热系数由1536 W/(m^(2)·K)增至3569 W/(m^(2)·K)。

A two-phase circulation cooling system with a multi-channel direct cooling plate was developed.The R1233zd(E)cooling medium was used.The thermodynamic cycle and cooling performance were investigated under the following conditions:the condensing temperature was set to 10℃,15℃,and 20℃,the mass flux varied from 147-882 kg/(m^(2)·s),and the heat flux varied from 7.73-39.75 kW/m^(2).The results show that the enthalpy of the refrigerant at the cooling plate outlet decreases with an increase in the mass flux.Additionally,the system pressure and enthalpy of the refrigerant increase with an increase in heat flux.Under different heat fluxes,the wall temperature of the cold plate varies differently.When the heat flux is 7.73 kW/m^(2),the maximum temperature of local wall difference decreases from 2.9 K to 1.6 K,whereas the mass flux rises from 147 kg/(m^(2)·s)to 735 kg/(m^(2)·s).For a heat flux of 39.75 kW/m^(2),the maximum temperature of local wall difference increases from 3.6 K to 5.2 K.For different mass flux,the surface heat transfer coefficients rise to different degrees with an increase in heat flux.When the mass flux is 147 kg/(m^(2)·s),the surface heat transfer coefficient increases from 1843 W/(m^(2)·K)to 4528 W/(m^(2)·K).However,for a mass flux of 588 kg/(m^(2)·s),the surface heat transfer coefficient under the same condition rises from 1536 W/(m^(2)·K)to 3569 W/(m^(2)·K).