Αποτελέσματα Αναζήτησης
29 Ιουλ 2024 · This heat transfer calculator will help you compute rates for each type of heat transfer. To do it: Choose a type of heat transfer, e.g. we want to calculate fluid convection. Enter a heat transfer coefficient. Let's assume it is 2000 W/m 2 ·K. Specify the surface area of 1 m 2. Enter the bulk temperature of 20 °C and surface temperature of ...
Heat Transfer Area. Usually heat is transferred in heat exchangers over a certain Heat Transfer Area. The latter is formed differently in the various heat exchanger types. For instance, in shell-and-tube heat exchangers the heat transfer area is formed by the outside surface area of all tubes.
The structure of the gas flow which determines the heat transfer and flow losses is complex. It consists of horseshoe vortices in the stagnation area and flow separation in the wake of the tubes. The horseshoe vortices increase the heat transfer. In the wakes the heat transfer is low.
Q = mcΔT, where Q is the symbol for heat transfer (“quantity of heat”), m is the mass of the substance, and ΔT is the change in temperature. The symbol c stands for the specific heat (also called “ specific heat capacity ”) and depends on the material and phase.
The heat transfer analysis of a heat exchanger involves relating the total heat transfer rate to variables like inlet and outlet temperatures of the hot and cold fluids, the overall heat transfer coefficient, and the overall heat transfer surface area. The analysis is essentially based on the energy balance between the heat gained by the cold ...
Heat transfer processes are classified into three types. The first is conduction, which is defined as transfer of heat occurring through intervening matter without bulk motion of the matter.
Algebraic expressions for the correction factor Fhave been developed for vari- ous shell-and-tube and cross-flow heat exchanger configurations [1–3], and the results may be represented graphically. Selected results are shown in Figures 11S.1 through 11S.4 for common heat exchanger configurations.
