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препараты детям для улучшения мозговой деятельности, DIRECT CONTACT HEAT EXCHANGERS - thermopedia.com, 12 Different Types of Heat Exchangers & Their Application [PDF], Heat exchanger - Wikipedia, Types of Heat Exchanger: Definition, Parts and Application , Direct Contact Heat and Mass Exchanger for Heating, Cooling , Heat Exchanger – Types, Diagram, Working, Applications , Understanding Heat Exchangers - Thomasnet.
The exchange of heat between two fluid streams can, in general, be accomplished using either direct contact or surface-type heat exchangers. There are, however, several limitations to the use of direct contactors. First, if two fluid streams are placed in direct contact, they will mix, unless the streams are immiscible. Thus, stream contamination will occur depending on the degree of miscibility. The two streams must also be at the same pressure in a direct contactor, which could lead to additional costs. The advantages in utilizing a direct contactor include the lack of surfaces to corrode or foul, or otherwise degrade the heat transfer performance. Other advantages include the potentially superior heat transfer for a given volume of heat exchanger due to the larger heat transfer surface area achievable and the ability to transfer heat at much lower temperature differences between the two streams. Still another advantage is the much lower pressure drop associated with direct contactors as compared to their tubular counterparts. A final advantage is the much lower capital cost as direct contact heat exchangers can be constructed out of little more than a pressure vessel, inlet nozzles for the fluid streams, and exit ports. Of course, it is sometimes advantageous to provide internals, as will be discussed later., Direct contact heat exchangers have been used by heat transfer practitioners for more than one hundred years. In fact, the success of the industrial revolution has much to do with their initial use by James Watt in creating the needed vacuum for efficient steam engines., How do Heat Exchangers work? It is a device that allows heat from one liquid (liquid or gas) to be transferred to another liquid or gas without the two liquids mixing or coming into direct contact. They are used for cooling components that feature water to air, liquid-cooled, closed-loop systems..
A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. [1] The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. [2], Types of Heat Exchanger: Definition, Parts and Application :- Heat exchangers are mainly used for transferring of heat from one fluid to another fluid with indirect contact between them. Heat exchangers design is essential for their high efficiency., For more than 100 years ago, direct contact heat and mass exchangers (DCHME) have been widely used in various industries, including chemical process plant, food, and beverage industry, geothermal heat recovery, seawater desalination, waste heat recovery, energy storage systems, production of steam generation for the Rankine power cycle, air cond, Heat exchangers in which there is an intermittent flow of heat from hot to cold fluid via heat storage and heat rejection through the exchanger surface or matrix are referred to as indirect or storage type heat exchanger or regenerator., Conduction is the transfer of thermal energy between materials in contact with one another. Temperature is a measure of the average kinetic energy of molecules in a material. Objects that are at a higher temperature exhibit more molecular motion than objects that are at a lower temperature., Learn about direct contact heat exchangers, devices that efficiently transfer heat between fluids in direct contact, widely used across various industries..