Heat Exchangers: Design Considerations. Parallel Flow. Counterflow. Heat Exchanger Types. Types. Heat exchangers are ubiquitous to energy conversion and utilization. They involve heat exchange between two fluids separated by a solid and encompass a wide range of flow configurations.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Heat Exchanger TypesTypes
Heat exchangers are ubiquitous to energy conversion and utilization. They involve heat exchange between two fluids separated by a solid and encompass a wide range of flow configurations.
Unfinned-One Fluid Mixed
the Other UnmixedTypes (cont.)
direction (y) is prevented for the finned tubes, but occurs for the unfinned condition.
shell-side fluid, both of which enhance convection.
One Shell Pass,
Two Tube Passes
Two Shell Passes,
Four Tube Passes
one or both fluids is a gas.
flow passages, and laminar flow.
(a) Fin-tube (flat tubes, continuous plate fins)
(b) Fin-tube (circular tubes, continuous plate fins)
(c) Fin-tube (circular tubes, circular fins)
(d) Plate-fin (single pass)
(e) Plate-fin (multipass)
1 / U A = 1 / h1 A1 + dxw / k A + 1 / h2 A2
U = the overall heat transfer coefficient (W/m2K)
A = the contact area for each fluid side (m2)
k = the thermal conductivity of the material (W/mK)
h = the individual convection heat transfer coefficient for each fluid (W/m2K)
dxw = the wall thickness (m)
n = 0.4 for heating (wall hotter than the bulk fluid) and 0.33 for cooling (wall cooler than the bulk fluid)
Evaluation of depends on the heat exchanger type.
A Methodology for Heat Exchanger
- The Log Mean Temperature Difference (LMTD) Method -LMTD Method
Special Operating ConditionsSpecial Conditions