The hot and cold fluids alternate between each of the plates. With a plate type heat exchanger, the heat penetrates the surface, which separates the hot medium from the cold one very easily. The shell and tube heat exchangers are the work horses. This article discusses some general aspects of plateandframe heat use these design charts for preliminary sizing. There are different types of compact heat exchanger design available. You can simulate the plate heat exchanger perfect for your needs, any time of the day, from anywhere. Heat exchanger theory and the heat exchanger design equation.
The heat exchanger theory article provides you with information about the fundamentals of a heat exchanger and will be useful for a heat exchanger inspection concept to describe this theory, you may know we need to heat or to cool process fluids in industrial plants to facilitate process reactions. Design and analysis of a newly installed plate heat exchanger apparatus for the wpi unit operation laboratory course. Hisaka websimulator hws plate heat exchanger this is the. More than 90% of heat exchangers used in industry are of the shell and tube type 7. The basic heat exchanger design equation can be used for a variety of types of heat exchangers, like double pipe heat exchangers or shell and tube heat exchangers. For clarity and brevity, we chose to simplify information and calculation methods that are exposed only partially and which refer to the simplest cases. In cross flow heat exchangers, one fluid flows through tubes and second fluid passes around the tubes perpendicularly.
Since all heat exchangers considered in this experiment have a single pass for both the hot and cold fluids, the discussion below is limited to singlepass heat exchangers. How to design a tubular heat exchanger hrs heat exchangers. However, new improvements in gasket design and overall heat exchanger design have allowed some large scale applications of the plate type heat exchanger. The theory of heat transfer from one media to another, or from one fluid to another, is determined by several basic rules. Classification according to design or type tubular plate type extended surface regenerative phe spiral plate coil printed circuit gasketed welded brazed doublepipe shellandtube spiral tube pipe coils crossflow to tubes parallel flow to tubes plate fin tubefin ordinary separating wall heat pipe wall rotary fixedmatrix rotating hoods. Types of heat exchangers shell and tube, plate type. Design of platefin tube dehumidifiers for humidification. A plate type heat exchanger, as illustrated in figure 2, consists of plates instead of tubes to separate the hot and cold fluids. Governing equations for the wet control volume figure 2 center illustrates the twodimensional discretization of the platefin tube heat exchanger in the y and z directions.
The heart of the heat exchanger contains a fully welded circular plate pack made by pressing and cutting round plates and welding them together. The design of a heat exchanger addresses mainly three phases. In process industries, shell and tube exchangers are used in great numbers, far more than any other type of exchanger. Plate heat exchanger were first introduced in the 1920s. The heat exchanger is adiabatic with respect to the environment no heat losses heat and mass transfer are calculated at constant pressure. Klarexs netherlands selfcleaning heat exchanger consists of a design that reduces the surface area by approximately 20% see fig. Fired heaters the selection of a heat exchanger depends on many factors including capital and operating costs, fouling, corrosion tendency, pressure drop, temperature ranges, and. Special models are however also suitable for higher pressures. The determination of the optimum heat exchanger design for a specific, well defined application can be regarded as a two stage process. High value for overall heat transfer coefficient, for the same two fluids, a flat plate heat exchanger typically has a u value much higher than either a shell and tube heat exchanger or a spiral heat exchanger. Plate heat exchangers are designed to optimize heat transfer, because the corrugated plates provide by far the greatest surface area through which the heat can be drawn from one gas or liquid to the other. Heat exchanger design an overview sciencedirect topics. Unit operations lab heat exchanger 11 heat exchanger heat exchange is an important unit operation that contributes to efficiency and safety of many processes. Plate heat exchangers were first produced in the 1920s and have since been widely used in a great number of sectors a plate exchanger consists of a series of parallel plates that are placed one above the other so as to allow the formation of a series of channels for fluids to flow between them.
The first stage is concerned with the selection of the most appropriate heat exchanger type, for example, the choice of a shell and tube exchanger as opposed to a plate, rotating wheel, heat pipe, etc. Qualitative dependence of the fluid temperature on position inside a singlepass heat exchanger is shown in fig. Heat exchangers types, theory and basics training youtube. In addition, we will examine various aspects of heat exchanger design and. Heat transfer theory tells us that the log mean temperature difference is the average temperature difference to use in heat exchanger design equation calculations. The heat transfer plates are made in stainless steel and are brazed with copper as standard. The technology features a shell and tube heat exchanger in the vertical position. Plate heat exchanger theory phe structure and functional. In any process, it should be kept as close as possible to the design value, with a tolerance range established according to the available pumping power. For a more complete explanation of heat transfer theory and calculations, download the following brochure. We will begin first, by discussing th e basic principles of heat tr ansfer for a heat exchanger.
Optimisation of plateplate fin heat exchanger design kunpeng guo the university of manchester 2015 abstractphd thesis with increasing global energy consumption, stringent environmental protection legislation and safety regulations in industrialised nations, energy saving has been put under high priority. The heat exchanger design equation can be used to calculate the required heat transfer surface area for a variety of specified fluids, inlet and outlet temperatures and types and configurations of heat exchangers, including counterflow or parallel flow. A unique, singlesource volume offering essential material on heat exchanger design in a unified approach suitable to many applications, fundamentals of heat exchanger design details an indepth thermal and hydraulic design theory underlying twofluid heat exchangers for steadystate operation. The effectiveness of a plate heat exchanger with a finite number of plates is affected by the end channels, and the channels between two adjacent passes. A third type of heat exchanger is a plate and shell heat exchanger, which combines plate heat exchanger with shell and tube heat exchanger technologies. Plate heat exchanger working principle, how a plate heat. Now it is widely used in a great number of sectors like sugar industry, pharmaceutical industry, food processing industries etc. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a. Access the url below and click on the websimulator icon. Hrs heat exchangers has its own specific formulas for use with corrugated tubes. Heat exchangers types, theory and basics training bin industrial training. The plate andframe heat exchanger design consists of stacked of corrugated plates which are bonded together. In this chapter we will examine the basic theory of heat exchangers and consider many applications. A heat exchanger follows this principle in its endeavour to reach equalisation.
All these heat exchangers can be operated in both parallel and. As older facilities are upgraded or newly designed facilities are built, large plate type heat exchangers are replacing tube and shell heat exchangers and becoming more common. This is due to the larger area the plates provide over tubes. Pdf heat exchanger design handbook matt pennington. The units also have a flexible design and are easy to service and maintain. In addition, we will examine various aspects of heat exchanger design and analysis. Theory and selection heat exchangers are devices that transfer heat between two luids. It is therefore possible to heat or cool fluids or gases which have minimal energy levels. This threepart series outlines the lost opportunities and the importance of proper heat exchanger selection. A heat exchanger follows this principle in its endeavour to reach equalization. A major qualifying project submitted to the faculty of. The relation between the parameters and the heat transfer coefficients is defined in a mathematical formula that is specific to the geometry i.
Doc report heat exchanger ridzuwan rahimi academia. Gasketed plate heat exchangers hxxxliquid gasketed plate heat exchangers are particularly suitable for large fl ows and high cooling capacities. Plateandframe heat exchangers designing compact heat exchangers part 1. In our daily activity, sizing request the inclusion of many other parameters and heat exchanger equation. The stack of heat transfer plates and gaskets is clamped together with bolts in a frame. This means that the plate heat exchanger can also be dismantled for cleaning and maintenance. Pdf heat exchangers are devices used to transfer heat between two or more fluid streams at different temperatures. Modeling and design of plate heat exchanger intechopen. Heat exchanger and its types engineering solutions.
Copper brazed plate heat exchangers are pressure resistant up to 30 bar, nickel brazed up to 10 bar. Jul 01, 2016 because the cooler fluid exists the counter flow heat exchanger at the end where the hot fluid enters the heat exchanger, the cooler fluid will approach the inlet temperature of the hot fluid. The pressure drop is an important parameter that needs to be considered in the design and optimization of a plate heat exchanger. Welded, semiwelded and brazed heat exchangers are used for heat exchange between highpressure fluids or where a more compact product is required. Plate heat exchanger, how it works working principle hvac industrial engineering phx heat transfer duration. Conventional heat exchangers suffer from fouling, leading to a decrease in the heat transfer coefficient with time.
A compact heat exchanger is a device characterized by a high heat transfer area per unit volume more than 300 m2m3. Optimisation of plateplatefin heat exchanger design. Often, for recovering energy from an industrial exhaust, a dimpletype heat exchanger would be used. Design and analysis of a newly installed plate heat exchanger.
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