Heat exchanger may be classified according to their flow arrangement. In parallel-flow heat exchangers, the two fluids enter the exchanger at the same end, and travel in parallel to one another to the other side. In counter-flow heat exchanger the fluids enter the exchanger from opposite ends.
What is a louvered fin?
Louvered fins are a widely used means of improving the thermal performance of heat exchangers. One of these, designated here as Type I, is an array of circular tubes, with the tubes deployed perpendicular to an assemblage of parallel louvered fins.
What is fin type heat exchanger?
Tube Fin Heat Exchangers, also called finned coil heat exchangers, consist of tubes that pass through a dense fin stack that is mechanically supported by a mounting frame. Fluid passes through the tube coils, conducts heat to the fins and dissipates heat to air forced through the heat exchanger.
What are the types of fins that are used in heat exchangers?
The main types of fins used in compact heat exchangers include plane, wavy and rectangular fins. The wavy fin and tube arrangement is famous plate fin and tube heat exchanger where it is used in applications that are constricted by high resistance to thermal on the air side of the heat exchanger [4].
What is cross flow heat exchanger?
A cross-flow heat exchanger exchanges thermal energy from one airstream to another in an air handling unit (AHU). A cross-flow heat exchanger is used in a cooling and ventilation system that requires heat to be transferred from one airstream to another.
What are the major types of heat exchangers based on the flow configuration?
There are four principal flow configurations employed by heat exchangers:
- Cocurrent flow.
- Countercurrent flow.
- Crossflow.
- Hybrid flow.
What are louvers made of?
Modern louvers are often made of aluminum, metal, wood, or glass. They may be opened and closed with a metal lever, pulleys, or through motorized operators.
How do you spell louvered?
Correct pronunciation for the word “louvered” is [lˈuːvəd], [lˈuːvəd], [l_ˈuː_v_ə_d].
What is the use of fin in heat exchanger?
Fins are thus used whenever the available surface area is found insufficient to transfer required quantity of heat with available temperature gradient and heat transfer coefficient. In the case of fins the direction of heat transfer by convection is perpendicular to the direction of conduction heat flow.
What is the use of fins in heat exchanger?
How does a cross flow heat exchanger?
A crossflow heat exchanger is designed so that the two fluids flow perpendicular to one another. This is typically utilized when one fluid is a liquid and the other is a gas, as in a car radiator in which hot water flowing left and right is cooled by air moving up or down, Bright Hub Engineering explained.
Where we use cross flow heat exchanger?
It is normally used where hygienic standards require that both airstreams are kept completely separate from one another. It is often used in heat recovery installations in large canteens, hospitals and in the food industry. Unlike a rotary heat exchanger, a cross-flow heat exchanger does not exchange humidity.
What do you know about compact heat exchanger with louvered fin?
The terminology which is used widely in the field of compact heat exchanger with louvered fin is described. The flow phenomenon affected by the operating conditions and the geometric parameters of the louvered fin is examined using the flow visualization techniques found in the literature.
What is the physical principle of the louvered fin?
The physical principle of the louvered fin is based on the breaking the boundary layer of the flow that passes through the louvers. The structure of the flow phenomenon over the louvered fins is given in details at the following section.
How do louvered fins enhance the heat transfer?
The louvered fins enhance the heat transfer by providing multiple flat-plate leading edges with their associated high values of heat transfer coefficient. Although the louvered fins are similar in principle to the offset strip fin, they can enhance heat transfer by a factor of 2 or 3 compared with equivalent un-louvered surfaces.
What are the commonly used forms of plate fin heat exchangers?
The commonly used forms of the extended surface of the plate fin heat exchangers are the triangular or rectangular plain fin, offset strip fin, wavy fin, louvered fin and perforated fin as shown in Figure 1. Figure 1.
