Calculate according to the formula Φ=(T1-T2)/(δ/λ A), where Φ is the heat flow from point 1 to point 2, W; T1 is the temperature at point 1, ℃;T2 is the temperature at 2 points, ℃;λ is the thermal conductivity, which is a parameter representing the thermal conductivity of materials, W/(m · ℃);δ is the medium thickness, m;
Reference standard: Qian Songwen's 2002 version P74 (59) in the Heat Exchanger Design Manual is calculated according to the formula △ tm=(△ t2 - △ t1)/ln (△ t2/△ t1), where △ t1 is a small temperature difference, ℃;△ t2 is a large temperature difference, ℃;△ tm is the logarithmic average temperature difference, ℃;
Reference standard: When Qian Songwen's 2002 version of Heat Exchanger Design Manual P74 (59) △ t1/△ t2<2, the average temperature of the heat exchanger is calculated according to the formula △ tm=(△ t1+△ t2)/2;When △ t1/△ t2 ≥ 2, calculate according to the formula △ tm=(△ t2 - △ t1)/ln (△ t2/△ t1), where △ t1 is a small temperature difference
Reference standard: Qian Songwen's 2002 version P74 (59) in the Heat Exchanger Design Manual is calculated according to the formula △ tm=(△ t1+△ t2)/2, where △ t1 is a small temperature difference, ℃;△ t2 is a large temperature difference, ℃;△ tm is the arithmetic mean temperature difference, ℃;
Calculate according to the formula, where α i is the heat transfer film coefficient of fluid in the pipe, W/(m2 · ℃);α o is the heat transfer film coefficient of fluid outside the tube, W/(m2 · ℃);Ri and ro are respectively the fluid fouling thermal resistance inside and outside the pipe, (m2 • ℃)/W);Ai and Ao are respectively the heat transfer area of the inner and outer surfaces of the heat exchange tube, m2; Am is the inner
Calculate according to the formula Q=mc (T1-T2), where m is the mass, kg; c is the specific heat capacity, J/(kg · ℃);T1 is the initial temperature, ℃;T2 is the termination temperature, ℃;Q is the heat absorbed or released, positive value represents heat absorption, negative value represents heat release, J;
The heat flow rate refers to the heat transfer process caused by the relative displacement between the parts of the fluid caused by the macro movement of the fluid and the mixing of cold and hot fluids.Calculate according to the formula Φ=hA (T-TW), where h is the convective heat transfer coefficient, W/(m2 · ℃);A is the heat transfer area, m2; T is the temperature of hot fluid, ℃;TW ...
Reference standard: Qian Songwen, 2002 edition P59 (44), Design Manual of Heat Exchanger, calculates according to the formula F=π di2no/4, where di is the inner diameter of the heat exchanger, m; no is the number of heat exchange tubes per pass;F is the sectional area of pipe passage, m2
Reference standard: Qian Songwen, 2002 version P59 (44) of the Heat Exchanger Design Manual, calculates according to the formula A=π don (L-0.03), where do is the outer diameter of the heat exchanger, m; L is the length of the heat exchanger, m; n is the number of heat exchangers;0.03 is the sum of the thickness of two tube plates, m; A is the heat exchange area, m2
Reference standard: Qian Songwen, 2002 Edition, P39 (24) of the Heat Exchanger Design Manual, calculates according to the formula A=π d (L - δ - 0.003) n, where d is the outer diameter of the heat exchanger, m; L is the length of the heat exchanger, m; δ is the thickness of the tube sheet, m; n is the number of heat exchangers;A is the heat exchange area, m2
Reference standard: Qian Songwen, 2002 Edition, P34 (19) of the Heat Exchanger Design Manual is calculated according to the formula A=π d (L-2 δ - 0.006) n, where d is the outer diameter of the heat exchanger, m; L is the length of the heat exchanger, m; δ is the thickness of the tube sheet (assumed to be 0.05m), m; n is the number of heat exchangers;A is the heat exchange area, m2
The fuel oil consumption is calculated according to the effective heat load of the heating station, the heat value of the fuel oil, and the efficiency of the heating system.Specifically, it is calculated by the formula g=q/(E η R), where q is the effective heat load, W; E is the fuel oil heat value, J/kg; η R is the heating system efficiency;G is the fuel consumption for heating, kg/s
The effective heat load of the heating furnace in the heating station is calculated according to the mass flow, specific heat capacity, incoming oil temperature and outgoing oil temperature.
![On line calculation program for total heat transfer coefficient K of shell and tube heat exchanger [Recommended]](https://cdn.youqichuyun.com/data/attachment/portal/201304/05/182132lsl2wow0rhqhhosc.gif.thumb.jpg)
