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34 Components design name PCHE. The plates are joined by a technique called diffusion bonding, which includes a thermal process that allows grain growth and produces a free join interface between the plates [52]. The final result is a monolithic metal block which inherits all the properties (a) Metal plates (b) Section of the block Figure 3-1: PCHE plates and section of the final block [2]. of the original material. The benefits of such process are very high pressure containment capabilities, avoidance of corrosion cells, possibility of channels with very small diameters, high effectiveness and tolerance to high temperatures. Figure 3-1 presents a diagram of the plates and a picture of a PCHE section. Figure 3-1a shows the metal plates that can be identified with different colors according to the hot and cold sides of the heat exchanger. Each plate corresponds to a different side, but it is possible to assign two or more plates to a specific stream. The diameters of the channels are approximately semicircular in cross section with diameters between 1.0 and 2.0 mm. However, it is possible to obtain smaller diameters with values of 0.1 mm [16]. The channels can be straight or wavy, but the last option is preferable since it enhances the heat transfer and decreases the component size. Although the maximum dimensions of a PCHE core are 0.6x0.6x1.5 m [16], the core blocks can be welded together to increase the flow capacity until the required values are reached. The typical characteristics of these devices are shown in Figure 3-2. Characteristic Unit weight Max. design P Design T Area/unit volume Minimum pinch Maximum effectiveness Overall HTC Plate thickness Passage width kg bar ◦C m2 /m3 m2 /m3 ◦C % W/m2 W/m2 mm mm — — Value 1 - 60000 650 -271.25 - 900 1300 (100 bar) 650 (500 bar) 1 98.00 LP gas cooler 500 - 1000 HP gas cooler 1000 - 4000 0.5 - 5.0 0.5 - 5.0 Gases: 1000 - 100000 Liquids: 10 - 5000 Reynolds number Figure 3-2: PCHE Typical characteristics and operational envelope [3]. J.S. Bahamonde Noriega Master of Science ThesisPDF Image | Design method for s-CO2 gas turbine power plants
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