09-07-2012, 11:24 AM
Heat Exchangers:Design Considerations
HeatExchangerDesign (1).ppt (Size: 2.3 MB / Downloads: 115)
Heat Exchanger 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.
Overall Heat Transfer Coefficient
An essential requirement for heat exchanger design or performance calculations.
Contributing factors include convection and conduction associated with the
two fluids and the intermediate solid, as well as the potential use of fins on both
sides and the effects of time-dependent surface fouling.
With subscripts c and h used to designate the hot and cold fluids, respectively,
the most general expression for the overall coefficient is