Equivalent diameter heat exchanger

• for pressure drop. In which the equivalent diameter corresponds to.

  

D is the equivalent diameter defined in the case of the plate heat exchangers as approximately 2 the mean gap.

Equivalent diameter heat exchanger. The equivalent diameter is 4 times the flow area over the wetted perimeter. If you work this out with a simple circular tube then the equivalent diameter is the diameter of the tube as you would expect it to be. This formula is useful for getting the Reynolds number for.

The Equivalent diameter of the tube for transverse fin heat exchanger formula is defined as the diameter equivalent of the tube through which the fluid will flow in a transverse fin heat exchanger is calculated using Equivalent diameter Reynolds Numberviscosity of fluid Mass Flux. To calculate Equivalent diameter of the tube for transverse fin heat exchanger you need Reynolds Number Re. The equivalent diameter is rewritten here for convenience heated c e P A D 4 5129 From Figure 521 the equivalent diameter for the square pitch layout is o t o e d P d D π 4 2 π 2 4 5130a From Figure 521 the equivalent diameter for the triangular pitch layout is.

4222 Shell Equivalent Diameter The equivalent diameter is calculated along instead of across the long axes of the shell and therefore is taken as four times the net flow area as layout on the tube sheet for any pitch layout divided by the wetted perimeter. 1 414 wetted perimeter 4free -. D is the equivalent diameter defined in the case of the plate heat exchangers as approximately 2 the mean gap.

Heat exchangers analysis and heat translate calculations are provided. The conventional and prevalent methods such as KERN method are presented. De equivalent diameter of shell side m The shell-side heat transfer coefficient ho is then calculated as.

In the case of a double pipe heat exchangers youll need two distinct equivalent diameters. - for heat transfer. Deq Di2 - do2do.

• for pressure drop. Deq Di - do. If you limit the discussion to finned circular tubes changes in the fin shape eg.

Serrated fins will cause different heat transferpressure drop behavior even for the same length scale. I model the heat exchanger as a double pipe exchanger with the equivalent heat transfer surface area of the entire device. The question I do have now is the following.

I do calculate the Reynoldsnumber with the hydraulic diameter of the entire tube bank within the shell to obtain the heat transfer coefficient of the plain tubes. 16 rows The equivalent diameter of a rectangular tube or duct can be calculated as Huebscher de 130. Similar correction factors are available for exchanger types other than shell and tube including crossflow and compact exchangers.

Tube Side Heat Transfer Coefficients. Tube side heat transfer coefficients are easy to determine since the Seider-Tate equation or equivalent applies. Here are the steps to calculate shell diameter of a shell and tube heat exchanger using preliminary design.

Knowing the hot and cold fluid inlet and outlet temperatures and mass flow rate of. 5 T temperature K U overall heat transfer coefficient W m2K v specific volume m3 kg w flow velocity m s Greek α thermal diffusivityα k ρc p m2 s β heat transfer area per volume m2 m3 δ gap between the plates of a plate or spiral heat exchanger m ε heat exchanger effectiveness -. 4 Hydraulic Radius This calculation is used for Heat Exchanger Calculations specially for Double Pipe Heat Exchanger for annulus Heat Transfer Calculations Characteristic Length is the ratio of Volume Area.

The plate width is set by a numeric value of 01524 m. The initial plate spacing for the hot stream is 00043 m and for the cold stream is 00088 m and the core diameter is 00508 m. The second case study consists of designing a condenser for a cryogenic process.

The data were taken from a case study to design a compact heat exchanger 13. In which the equivalent diameter corresponds to. The correlation showed excellent agreement 2b Where n is equal to 2 for a single U-tube system and is corresponding to 2 do for double U-tube ground heat exchanger.

Gu and ONeal 15 utilized a steady-state heat transfer simulation based on the. And the tube diameter. The Reynolds number associated to the shell-side velocity Res is given by.

𝑣 𝜇 4 where Deq is the equivalent diameter and 𝜇 is the shell-side stream viscosity. The equivalent diameter present in the Reynolds number depends on the tube layout. Concentric Tube or Pipe Heat Exchangers are used in a variety of industries for purposes such as material processing food preparation and air-conditioning.

They create a temperature driving force by passing fluid streams of different temperatures parallel to each other separated by a physical boundary in the form of a pipe. This induces forced convection transferring heat tofrom the.