Abstract
Design of effective heat transfer devices and minimizing costs are desired sections in industry and they are important for both engineers and users due to the wide-scale use of heat exchangers. Traditional approach to design is based on iterative process in which is gradually changed design parameters, until a satisfactory solution is achieved. The design process of the heat exchanger is very dependent on the experience of the engineer, thereby the use of computational software is a major advantage in view of time. Determination of operating parameters of the heat exchanger and the subsequent estimation of operating costs have a major impact on the expected profitability of the device. There are on the one hand the material and production costs, which are immediately reflected in the cost of device. But on the other hand, there are somewhat hidden costs in view of economic operation of the heat exchanger. The economic balance of operation significantly affects the technical solution and accompanies the design of the heat exchanger since its inception. Therefore, there is important not underestimate the choice of operating parameters. The article describes an optimization procedure for choice of cost-effective operational parameters for a simple double pipe heat exchanger by using CFD software and the subsequent proposal to modify its design for more economical operation.
Highlights
Heat exchangers belong to the most important elements of energy facilities and they are used in a wide field of industry [1]. They are devices for heat transfer among heat carrying fluids. They can be classified according to numerous criteria e.g. according to way of use, design arrangement, way of the heat exchange or according to contact of one and other fluid (mixer-heat exchanger – it does not have a heat exchange surface and the fluids are mixed together; regenerator – it have one heat exchange surface, which is alternatively flowed around by hot and cold fluid stream and the exchangers use heat accumulation; there is recuperator, which is referred to as indirect transfer type, because a wall separates the fluid streams) [2]
The main assessment detail from CFD analyses was the performance of heat exchanger, which was expressed by the ratio between incomes from the heat distribution and operating costs for circulation of heat transfer fluid
Double pipe heat exchangers are often used in special operating conditions such as low flow volume, for large temperature differences, at desired residence time, for fast temperature changes or at high pressure operation and if there is a requirement for pure parallel flow or counterflow [2]
Summary
Heat exchangers belong to the most important elements of energy facilities and they are used in a wide field of industry [1]. They are devices for heat transfer among heat carrying fluids. They can be classified according to numerous criteria e.g. according to way of use (heaters, coolers, evaporators, condensers, etc.), design arrangement (heat transfer between two or more fluids, etc.), way of the heat exchange (without or with phase change) or according to contact of one and other fluid (mixer-heat exchanger – it does not have a heat exchange surface and the fluids are mixed together; regenerator – it have one heat exchange surface, which is alternatively flowed around by hot and cold fluid stream and the exchangers use heat accumulation (it is referred to as direct transfer type); there is recuperator, which is referred to as indirect transfer type, because a wall separates the fluid streams) [2]
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