How to find the Suitable Heat Exchanger?
You may believe that all heat exchangers are the same, but this is not the case. There are numerous varieties and models, each of which is designed for a specific function and use. What is the purpose of heat exchangers? Of course, the necessity for thermal processing of diverse goods, whether in the food, dairy, chemical, or pharmaceutical industries, is the correct response to this issue. In today's marketplace, a large selection of heat exchanger styles are available, and one of the first issues that arises on "standard" applications is the fact that many various types of heat exchangers can be found, all performing the same functions. Is this correct or incorrect? To reach a conclusion, one must examine the reasons why one heat exchanger is preferred over another, as well as whether the choice is correct based on the facts given. Consider a hypothetical application that could make use of a variety of heat exchangers. Let's choose a plate, spiral, or tubular design and ignore any product characteristics, focusing instead on why these selections were made: 1) The first customer went for a plate heat exchanger because it was less expensive. 2) The second customer had been prejudiced towards non-traditional tubular designs but was satisfied with his or her choice. 3) Because he or she was concerned about prospective gasket issues, the third customer chose a spiral-type heat exchanger. In addition, he or she could not ensure that the maximum temperature restriction would be met. https://www.youtube.com/watch?v=7NIYIPH-qHA A processor must be able to choose from a variety of heat exchanger equipment in order to match the best heat exchanger to the specific application. To make the best decision, consider both operating temperatures and pressures, the fluid qualities of the product, space, maintenance, multiproduct use on the same equipment, and, of course, price. Heat exchangers in most processors come in a variety of shapes and sizes, including kettles, plates, tubulars, spirals, and scraped surface heat exchangers. This equipment is used in a variety of ways within these processing plants. Pasteurize, sterilise, preheat, cool, deep cool, crystallise, slush freeze, temper, gel, or polymerize can all be done with them. Let's look at each one in more detail. 1. Kettle: Simply put, this is a tank with an outer jacket meant to hold heating or cooling fluid. While being mixed, blended, or agitated, the product is heated or chilled. Kettles, on the other hand, are neither thermally efficient nor operate continuously. 2. PHE: Plate Heat Exchangers are a type of heat exchanger that uses plates to transfer heat A number of corrugated metal sheets or heat transfer plates are clamped together in a frame to make these units. Gaskets separate the adjoining plates, forming a narrow, unbroken area through which liquid flows. The gaskets separate the fluids, which then travel through alternate routes (passes). Multiple fluid streams can be supported at once by grouping these channels and including intermediate separating/connecting plates. 3. Tubular Heat Exchanger: Tubular Heat Exchangers are a unique type of heat exchanger. These can come in a variety of styles. Two or three concentrically installed tubes make up a double- or triple-pipe unit. The heating or cooling medium passes through the inner tube, as well as the annular space between the intermediate and outer tubes in a triple-tube configuration. The product passes through the annulus between the two inner tubes or the inside tube in the opposite direction. 4. Shell and Tube Heat Exchanger: A tube sheet is made out of a bundle of parallel tubes with their ends extended. A cylindrical shell encloses the bundle. The tubes are connected in such a way that they can hold either the product or the media, depending on the application. 5. Heat Exchangers with a Scraped Surface: These are made up of a tube or cylinder with an inner tube (heat exchange surface) and an outer tube. The annular space is located between the two, and it is here that the media flows counter-current to the product. A revolving bladed shaft is concentrically positioned inside the inner cylinder to continuously agitate and remove the product from the heat exchange wall regions. Price is the most important factor to consider when choosing a heat exchanger, but a processor should never put the dollars for the initial capital expenditure ahead of his or her long-term goals and requirements. The price per square foot of heat exchange area can range anywhere from $25 to $2,500. (table 1). A processor should have a clear idea of where he or she wants to go a year from now. If he or she does, the processor should be aware of the current and future types, phases, and materials of construction necessary for the product (if it is a sensitive or complex product). Both are crucial to his or her operation's overall operational efficiencies and profitability.