What is thermal design of heat exchanger?
Thermal design of a shell and tube heat exchanger typically includes the determination of heat transfer area, number of tubes, tube length and diameter, tube layout, number of shell and tube passes, type of heat exchanger (fixed tube sheet, removable tube bundle etc), tube pitch, number of baffles, its type and size.
How do you calculate effective heat exchanger?
The effectiveness (ϵ) of a heat exchanger is defined as the ratio of the actual heat transfer to the maximum possible heat transfer. Qmax is the minimum of these two values i. e.
How do you calculate heat exchanger velocity?
To get: V = Velocity (ft/sec), the calculation is: Example: A heat exchange with a flow rate (F) of 100 gpm through a heat exchanger with 2 passes (P) that has 100 tubes (N) with diameters (D) of 1 inch will have a velocity of 0.82 ft/sec: Is that good?
How are baffle cuts calculated?
Baffle Cut and Spacing, Jc l c = baffle cut = distance from the baffle to the inside of the shell, mm or in.
What is sizing of heat exchanger?
Sizing of heat exchangers is done based on the required surface area for heat transfer.
How do you calculate the temperature of a heat exchanger wall?
According to the formula of heat resistance RP of heat exchanger plate, TW2 = tw1-q1rp is used to calculate the wall temperature TW2 on the other side; 5.
How is Nusselt number calculated?
Formula
- Nusselt Number : Nu = hL/k.
- Convection Heat Transfer Coefficient : k = Nuk/L.
- Characteristic Length : L = Nuk/h.
- Thermal Conductivity of the Fluid : k = hL/Nu.
- Where, Nu = Nusselt Number, h = Convection Heat Transfer Coefficient, L = Characteristic Length, k = Thermal Conductivity of the Fluid.
How do you calculate overall heat transfer coefficient in heat exchanger?
The overall heat transfer coefficient R = Resistance(s) to heat flow in pipe wall (K/W) Other parameters are as above. The heat transfer coefficient is the heat transferred per unit area per kelvin.