各位大虾~下面是2个的选型数据，我想问2个问题(红色标记)：1。冷却水温度与工艺需要温度才差3度，能实现吗?一般{zd1}能差多少度?如何计算?2。为什么换热功率大的反而需要的板层面积少?仅仅因为温差大吗?如何计算?谢谢~Hot side Cold side Fluid Water Water Density kg/m 989.7 992.8 Specific heat capacity kJ/(kg*K)4.18 4.18 Thermal conductivity W/(m*K)0.634 0.623 Viscosity inlet cP 0.432 0.767 Viscosity outlet cP 0.721 0.631 Volume flow rate m/h 2.4 7.2 Inlet temperature°C 65.0 32.0 Outlet temperature°C 35.0 41.9 Pressure drop kPa 1.21 10.0 Heat exchanged kW 81.80 Heat transfer area m4.3 Rel.directions of fluids Countercurrent Number of plates 33 Effective plates 31 Number of passes 11 Extension capacity 4Hot side Cold side Fluid Water Water Density kg/m 973.4 991.8 Specific heat capacity kJ/(kg*K)4.18 4.18 Thermal conductivity W/(m*K)0.667 0.627 Viscosity inlet cP 0.314 0.801 Viscosity outlet cP 0.432 0.586 Volume flow rate m/h 4.7 7.2Inlet temperature°C 90.0 30.0 Outlet temperature°C 65.0 45.9 Pressure drop kPa 13.1 22.0 Heat exchanged kW 131.8 Heat transfer area m1.4 Rel.directions of fluids Countercurrent Number of plates 12 Effective plates 10 Number of passes 11Extension capacity 25