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parting plates) was too high. This increased the size of the heat exchangers beyond acceptable values and hence use of these heat exchangers had to be abandoned. t tf Figure 9.2 Channel shape of the PCHE [from Dewson and Grady, 2003] Table 9.1 PCHE design characteristics – www.heatric.com Unit weight range Maximum design pressure Design temperature range Maximum nozzle size Maximum surface area Typical area/unit volume Minimum temperature approach Heat exchanger effectiveness Typical overall heat transfer coefficients Plate thickness Passage width Typical Reynolds number range (1) 0.2 mm for special cases (2) >10 mm for non-semicircular passages 1 kg to 60 tonnes as a single unit However larger modular assemblies are possible Current maximum design pressure 650 bar (9500 psi) Currently from 2K to 900°C (4R to 1650°F) 900 mm 10,000 m2 (108,000 ft2) per PCHE 1300 m2/m3 at 100 bar (400 ft2/ft3 at 1450 psi) 650 m2/m3 at 500 bar (200 ft2/ft3 at 7250 psi) 1°C (typically 3 - 5°C) 2°F (typically 5 - 10°F) up to 98% LP gas cooler 500 - 1,000 W/m2K (90 - 180 Btu/hrft2°F) HP gas cooler 1,000 - 4,000 W/m2K (180 - 700 Btu/hrft2°F) Water/water 7,000 - 10,000 W/m2K (1230 - 1750 Btu/hrft2°F) 0.5 mm(1) to 5.0 mm 0.5 mm to 5.0 mm(2) Gases: 1,000 - 100,000 Liquids: 10 - 5,000 The second possibility investigated was the use of printed circuit heat exchangers (PCHE) manufactured by HEATRIC. These heat exchangers are not sensitive to high pressures and high-pressure differentials since they consist of many plates into which the channels are chemically etched, followed by diffusion bonding to form a monolithic 204PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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