【摘要】 通过考察温度分布函数及其一阶导数和二阶导数,分析了3种情况下冷、热两种流体在间壁式单程换热器两侧的温度分布情况.结果表明:当两侧恒温时,温度分布线是平行于横轴的直线;一侧恒温一侧变温时,有温度变化流体的热容流量大小影响其温度分布线的单调性和凹凸性;当两侧变温且两种流体并流时,冷、热流体热容流量的大小影响温度分布线的单调性和凹凸性,热容流量的相对大小影响温度分布变化的相对快慢;当两侧变温且两种流体逆流时,冷、热流体热容流量的大小影响温度分布线的单调性,热容流量的相对大小影响温度分布线的凹凸性和变化的相对快慢.更多还原

【Abstract】 Three cases of temperature profile of cold and hot fluids in wall-type heat exchangers with single pass were analyzed by considering temperature distribution functions, their first derivatives and second derivatives. The results show that the temperature profile is of two lines parallel to the horizontal axis when the temperatures of two fluids on the two sides of heat exchangers are constant. The monotonicity, concavity and convexity of temperature profile are influenced by the specific heat capacity flow rate value of the fluid of different temperature when the temperature of one fluid is constant and the temperature of the other fluid is varied. The monotonicity, concavity and convexity of temperature profile for parallel flow in heat exchanges are influenced by the specific heat capacity flow rate values of two fluids. The relative speed of temperature change is influenced by the specific heat capacity flow rate relative values of two fluids when the temperatures of two fluids are variables. The monotonicity of temperature profile for counter flow in heat exchanges is influenced by the specific heat capacity flow rate values of two fluids. The concavity and convexity of temperature profile and the relative speed of temperature changes are influenced by the specific heat capacity flow rate relative values of two fluids when the temperatures of two fluids are variables.更多还原