Calculation formula for heat transfer area of a tubular heat exchanger
The heat transfer area calculation of a tubular heat exchanger needs to be carried out according to the specific actual situation. Generally, the following formula can be used:
A=q/(U×ΔT)
Wherein, A represents the heat transfer area of ​​the heat exchanger, in square meters; q represents the heat transfer per hour of the heat exchanger, in kilowatts; U represents the heat transfer coefficient, in W/(square meters×degrees Celsius); ΔT represents the temperature difference, in degrees Celsius.

Calculation of heat transfer coefficient

The heat transfer coefficient U is determined based on the physical properties and flow state of the fluid inside and outside the heat exchanger. The heat transfer coefficient U is different for different fluids, different flow states and different tube bundle structures.

In general, the heat transfer coefficient U can be calculated using the following formula:
U=1/(1/h_i+d/k+Δx/ln(D_i/D_o)/k+1/h_o)
Wherein, h_i and h_o represent the convection heat transfer coefficients inside and outside the tube, respectively; d represents the outer diameter of the tube; k represents the thermal conductivity of the tube; Δx represents the thickness of the tube wall; D_i and D_o represent the inner and outer diameters of the tube, respectively.

Calculation of temperature difference

The temperature difference ΔT refers to the temperature difference between the inside and outside of the heat exchanger, and its calculation requires the temperature of the inlet and outlet fluids. If the flow rate and temperature of the inlet and outlet fluids are known, ΔT can be calculated using the following formula:
ΔT=T_i-T_o
Wherein, T_i and T_o represent the temperatures of the inlet and outlet fluids, respectively.

Precautions

In the actual design of the heat exchanger, it is necessary to consider various factors such as the use scenario of the heat exchanger, the physical properties of the heat exchange fluid, and the flow characteristics inside the heat exchanger. When making specific calculations, the above formula needs to be improved and adjusted to achieve the best heat exchange effect.

Conclusion

The heat exchange area calculation of the tubular heat exchanger involves many factors and needs to be calculated according to the specific situation. The key is to determine the values of the heat transfer coefficient and temperature difference. In the actual design process, it is necessary to optimize and adjust according to factors such as the usage scenario and fluid properties to achieve a design solution that is conducive to the heat exchange effect.

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