传热单元数是反映冷热流体间换热过程难易程度的参数，也是衡量换热器传热能力的参数。
指出为取得较高的（火用）效率，传热单元数和水当量比应仔细选择，它们有一最佳值。
The results show that in order to obtain higher exergy efficiency number of transfer unit(NTU)and capacitance ratio should be selected carefully for they have optimum values.
讨论了传热单元数、冷热流体热容量比和流型对换热器传递有效度的影响，并把换热器传递有效度和效率以及换热器无因次熵产数进行了比较。
The effects of heat transfer units number, heat capacity ratio of fluids and flow patterns on exergy-transfer effectiveness are discussed. The comparison among exergy -...
用MATLAB计算食品过程中的物料平衡含水量、气体吸收的传质单元数和传热过程的调节，研究基于MATLAB的非线性方程、非线性方程组的求解和数值积分功能的应用。
The equilibrium water content of the solids for drying, the number of mass transfer units for gas absorption and mass flow rate for heat transfer system were obtained using MATLAB.
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