Standard design the plate heat exchanger consists of a pack of corrugated metal plates with portholes for the passage of the two fluids between which heat transfer will take place. Experimental investigation of the characteristics of a. An important, exclusive feature of the plate heat exchanger is that by the use of special connector plates it is possible to provide connections for alternative fluids so that a number of duties can be done in the same frame lane 1966, hargis et al. Introduction plate heat exchanger is a type of heat exchanger which consists of many corrugated stainlesssteel sheets separated by polymer gaskets and clamped into a steel frame. To solve a thermal problem, we need to know several parameters. The following assumptions are made in the modelling of plate heat exchanger see 4, 5,8,11. Calculate the required heat transfer rate, q, in btuhr from specified information about fluid flow rates and temperatures. It is the shell and tube heat exchanger temperature, considering normal operating conditions. It is not uncommon for plateandframe heat exchangers to have overall heat. Therefore, it can produce the most effective performance from the compact size. This greatly eliminates the risks of leakage and diffusion. The purpose is to utilise the cooling effect, utilise which without a heat exchanger is otherwise lost to.
You can simulate the plate heat exchanger perfect for your needs, any time of the day, from anywhere. The overall heat transfer coefficient of the exchanger is 300 wm2 k, and the area for heat transfer is 15. If possible, the heat exchanger should be designed to be selfcleaning, in other words so that the growth rate of fouling layer will slow down and eventually stop at a certain level. Hisaka websimulator hws plate heat exchanger this is the. Another approach introduce the definition of heat exchanger effectiveness, which is a. 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. This includes knowledge of precautions regarding media type, pressures, temperatures in the heat exchanger as well as specific precautions required by the process. This means that the plate heat exchanger can also be dismantled for cleaning and maintenance.
Maintaining a plate heat exchanger and its related cost is not just a good idea it is a necessity for any successful business strategy concerned with its continued manufacturing productivity. Tubeintube heat exchanger type he tubeintube heat exchanger type he is used primarily for heat transfer between the liquid and suction lines of the refrigeration plant. Assume tube diameter and bwg, assume tube length, l 2. In the industries there are all di erent types of heat exchanger designs available. Heat exchangers heat exchangers are used to transfer heat between two sources. Higher heat resistance and pressure resistance to support under severe conditions of 350. 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. Heat exchanger, life cycle assessment lca, life cycle cost lcc, stainless steel, carbon steel, environmental impact. Design considerations for plate type heat exchanger. The normal maximum operating temperature for a plate heat exchanger is approximately 120 degrees celsius. It is important that the frame is strong, rigid, and durable, as it is the foundation of any plate heat exchanger. A plate heat exchanger is considered with n, number of channels. In any heat exchanger there must be a fluid that requires a change in energy heating or cooling and a fluid.
Delivery of heat exchanger operating like it is new. General heating and cooling duties, heat recovery, pasteurization and uht treatment of a broad range of food products. The conditions are determined which decide the dimensions and velocities for a heat exchanger. The goals of this proje ct were to design a plate heat exchanger apparatus and evaluate the potential of replacing the current double pipe heat exchanger by this newly designed plate heat exchanger for the unit operation laboratory course. Flat plate heat exchanger design for mtr reactor upgrading. A plate heat exchanger is a compact type of heat exchanger that uses a series of thin plates to transfer heat between two fluids. The plate pack is assembled between a fix frame plate and a movable pressure plate and compressed by tightening bolts. Heat exchanger is an important and expensive item of equipment that is used almost in every industry oil and petrochemical, sugar, food, pharmaceutical and power industry. Index terms compact heat exchanger, corrugated plates, friction factor, forced convection. The stack of heat transfer plates and gaskets is clamped together with bolts in a frame. A technical reference manual for plate heat exchangers in. Cleaning heat exchanger plates with special chemicals. A heat exchanger is a device for heat transfer from one medium to another. Brazed heat exchanger general information the structure of plate heat exchanger.
Our gasketed plate heat exchanger range is the result of decades of experience, research and development in heat transfer technology. In design of sthe, you assume a value of u and perform iterations to see if the assumed value meetsexceeds ht or pressure. A gasket, of suitable material, between the plates, seals the fluid and directs the flow. E1mnl032a design and rating of shell and tube heat. Alfa laval gasketed plate heat exchangers are the most costeffective solution. Gasketed plate heat exchanger design phex is a software tool that is made to demonstrate the thermal analysis and calculations of gasketed plate heat exchangers. The plate pack is assembled between a frame plate and a pressure plate and compressed by tightening bolts. Thanks to the thin heat transmission plates, and high. Instead, the thermal plates are sealed by tig welding without. Any flow pattern may exist in the plate heat exchanger loop flow, series flow and complex flow. The two outer passes a cold and a hot one, actually.
Calculating number of plates in plate heat exchangers. A more detailed description of aircooled heat exchanger geometries is given refs. Same as with the design pressure, this value is defined by the thermal design. Dynamic modeling of a heat exchanger universiteit twente. A plate and frame heat exchanger is a very efficient heat transfer device. Alfa laval phe manual m15, tl10, tl20, ts20, mx25, m30.
Can someone please explain how the number of plates are calculated. The heat exchanger shall be operated by persons who have studied the instructions in this manual and have knowledge of the process. Dynamic modeling and control of plate heat exchanger article pdf available in international journal of heat and mass transfer 55s 2324. Life cycle assessment and life cycle cost of heat exchangers. Please note that the software can only do the basic design calculations the mechanical design.
Fast and detailed cleaning of heat exchanger plates. The basic principles of plate fin heat exchanger manufacture are the same for all sizes and all materials. The plate heat exchanger consists of a pack of corrugated metal plates with portholes for the passage of the two fluids between which heat transfer will take place. Modeling and design of plate heat exchanger intechopen. Optimal design of plateandframe heat exchangers for. In the phe the plates create a frame where the plates are pressed with headers and tie bars, and the seal is guaranteed by gaskets. Access the url below and click on the websimulator icon. This deterioration in performance is typically due to the buildup of scale, sediment andor biological mass on the plates. It consists of 101 plates, with 100 spaces between them. The alternative channels maximises the heat transfer surface in a compact manner. Heat transfer, conduction, convection, radiation contents 1. Due to the high heat transfer efficiency of the plates, plate type heat exchangers are usually very small when compared. A plateandframe heat exchanger figure 1 consists of pressed, corrugated metal plates.
For the modeling purpose of this report a simpli ed two uid counter current heat exchanger is used with a onedimensional ow, as shown in gure 3. Make an initial estimate of the overall heat transfer coefficient, u, based on. Mit brazed plate heat exchangers can be designed with plates having different heat transfer charecteristics. It may not be a practical design, but it suffices for an example. Combining each of these resistances in series gives. Most processes require the heating or cooling of streams to produce a desired temperature before the stream can be fed to operations. Apr 11, 2014 calculating number of plates in plate heat exchangers posted in student. It transfers heat by placing thin, corrugated metal sheets side by side and connecting them by gaskets. The plate andframe or gasketed plate heat exchanger essentially consists of a pack of thin rectangular plates sealed around the edges by. Intermediate heat transfer, a second course on heat transfer for undergraduate seniors and beginning graduate students. Operating any plate heat exchanger at temperatures above the design temperature of the gasket material will result in gasket and adhesive failure. Half of these are reserved for a hot water flow and the other half for a cold water flow. Gaskets, in addition to their sealing effect, serve to direct the flow of the fluids, and are placed along the grooves at the edges of the plates.
I have been reading about phes, however i have not come across any methods for calculating the number of plates required in phes. Plate andframe heat exchangers phes are used in many different processes at a broad range of temperatures and with a variety of substances. The two most common heat exchanger design problems are those of rating and sizing. Correcting flaws in construction and piping that may have a detrimental effect on heat transfer. This is due to the larger area the plates provide over tubes. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing and sewage treatment. 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 plates are fitted with a gasket which seals the interplate. Chapter 5 heat exchangers faculty of engineering and. The exchange can take place between a process stream and a utility stream cold water, pressurized steam, etc, a process stream and a power source electric heat, or between two.
This innovative gasketless design makes it possible to signi. The heat exchanger must fulfil process requirements after fouling. The hot and cold fluids alternate between each of the plates. This has a major advantage over a conventional heat exchanger in that the fluids are exposed to a much larger surface area because the fluids spread out over the plates. The calculations are performed through a series of click buttons arranged in order. Thermal science teaches us that for a flat plate heat exchanger, the overall heat transfer coefficient u is such that its inverse, called thermal resistance, is the sum of thermal resistances between the two fluids. Plate heat exchanger design mathematical model model parameters abstract the developments in design theory of plate heat exchangers, as a tool to increase heat recovery and ef.
It is not uncommon for plate andframe heat exchangers to have overall heat. For a shellandtube exchanger, an inline arrangement is considered with. The basic concept of a heat exchanger is based on the premise that the loss of heat on the high temperature side is exactly the same as the heat gained in the low temperature side after the heat and mass flows through the heat exchanger. Introduction a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. Heat exchanger effectiveness ntu method if more than one of the inlet and outlet temperature of the heat exchanger is unknown, lmtd may be obtained by trial and errors solution. Plate heat exchangers with 10 and 21 plates are used with a u type arrangement and one pass for each fluid. Higher temperatures may be reached with special gasket and adhesive materials. The 10 plate package heat exchanger consists of 5 channel. Cleaning plate heat exchangers d epending upon the nature of the fluids involved and the application, the heat exchanger s performance level may decline over a period of time. The corrugations, sidebars, parting sheets and cap sheets are held together in a jig under a predefined load, placed in a furnace and brazed to form the plate fin heat exchanger block. This study aims to obtain an applicable model which is able to design flat plate heat exchanger for many applications. A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids. A better understanding of the basic principles of heat transfer and. Therefore a plate type heat exchanger, as compared to a similarly sized tube and shell heat exchanger, is capable of transferring much more heat.
Gasketed plate heat exchangers hxxxliquid gasketed plate heat exchangers are particularly suitable for large fl ows and high cooling capacities. A plan for increasing heat exchanger performance for shell and tube exchangers should consider the following steps. Pdf dynamic modeling and control of plate heat exchanger. Welded plates expand the limits of plate heat exchangers. Optimisation of plateplatefin heat exchanger design. Shell and tube heat exchangers page 5 of 30 mnl 032a issued 29 august 08, prepared by j. The sigmawig allwelded plate heat exchanger does not use elastomer gaskets to seal each plate.
Using plate type heat exchangers as our core technology, hisaka works provides thermal solutions to our customers all over the world. This has a major advantage over a conventional heat exchanger in that the fluids are exposed to a much larger surface area because the fluids are spread out over the plates. A plate type heat exchanger, as illustrated in figure 2, consists of plates instead of tubes to separate the hot and cold fluids. Production and supply of every type of nut and pin. Design and analysis of a newly installed plate heat. Research into phes has increased considerably in recent years and this is a compilation of knowledge on the subject. Some plates require a hanger, which attaches the plate to the upper guide bar. Heat exchangers 73 individual thermal resistances of the system. Various types of fins and attachments are illustrated in fig. The optimal design of a multipass plateandframe heat exchanger with mixed grouping of plates is considered. It is safe to say that it would be rare to find someone in this industry that does not believe in having a plate heat exchanger maintenance strategy. At this stage the student can begin to apply knowledge of mathematics and computational methods to the problems of heat transfer. A plate andframe heat exchanger figure 1 consists of pressed, corrugated metal plates. John richard thome ltcm sgm epfl heat transfer heat exchanger design 1er mars 2008 6 41 the cross.
Plate heat exchanger working principle, how a plate heat. Basics of heat transfer this lecture is intended to refresh the post graduate students memory about the basics of heat transfer regarding the various modes of heat transfer, analogy between heat transfer and electric circuits, combined modes of heat transfer and the overall heat transfer coefficient. Flow of the substances to be heated and cooled takes. A total heat transfer area on one side of the heat exchanger, ntucminu, or the heat transfer area of the control volume encompassed by one fin on one side of a single heat exchanger cell m 2. Plate type heat exchanger design linkedin slideshare. Each plate also contains flow directors at the top and bottom of the heat transfer surface in the port hole areas, which evenly distribute the fluids. Gasketed plate heat exchanger design software thermal. For plate and platefin exchangers, the porosity between plates is taken. Our gasketed plate heat exchangers are optimizing heat transfer by large surfaces of corrugated plates drawing heat from one gas or liquid to the other. Heat exchanger the purpose of a heat exchanger is just thatto exchange heat.