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Energies 2022, 15, x FOR PEER REVIEW 10 of 15 Figure 7. Resistance characteristics of the hot fluid. 3.2. Effect of Hydraulic Diameter on the Performance of PCHE As can be seen in Figure 8, the hot fluid temperature distribution of the two wavy chan nels with different diameters was similar, and the temperature decreased more quickly wit increasing incline angle. Moreover, the temperature decline rate of the channel with d = 1.5 mm was larger than that of the channel with d = 1.8 mm under the same incline angle, an the outlet temperature of the channel with d = 1.8 mm was higher than that of the channe with d = 1.51 mm. This indicates that the overall heat transfer characteristics of the channe Energies 2022, 15, 6347 10 of 15 with d = 1.51 mm were better than those of the channel with d = 1.8 mm. Figure 7. Resistance characteristics of the hot fluid. Figure 7. Resistance characteristics of the hot fluid. 3.2. Effect of Hydraulic Diameter on the Performance of PCHE As can be seen in Figure 8, the hot fluid temperature distribution of the two wavy chan- nels with different diameters was similar, and the temperature decreased more quickly with increasing incline angle. Moreover, the temperature decline rate of the channel with d = 1.51 mm was larger than that of the channel with d = 1.8 mm under the same incline angle, and the outlet temperature of the channel with d = 1.8 mm was higher than that of the channel with d = 1.51 mm. This indicates that the overall heat transfer characteristics of the channel with d = 1.51 mm were better than those of the channel with d = 1.8 mm. Figurre88. .TTemempepreartautrue rdeisdtriisbturitbiountiofnhotf flhuoitdflwuitdh wdiiftfehrednitffcehraennteclhdaianmneltedr.iameter. Figure 9 shows the Nu distribution of hot fluid in the channels with different diameters. Figure 9 shows the Nu distribution of hot fluid in the channels with different diame Table 4 shows the average Nu and total pressure drop of hot fluid. It can be seen from ters. Table 4 shows the average Nu and total pressure drop of hot fluid. It can be seen fro Figure 9 that, when the incline angle of the wavy channel was equal to 0◦ and 15◦, the Nu Figure 9 that, when the incline angle of the wavy channel was equal to 0° and 15°, the N in the channel with d = 1.51 mm was larger than that of the channel with d = 1.8 mm. When the incline angle was 30◦, the Nu of the two channels was almost the same. However, when the incline angle was 45◦, except for the first pitch, Nu in the channel with d = 1.8 mm was larger than that with d = 1.51 mm. This result indicates that, when the incline angle was small, the small-diameter channel showed better heat transfer performance. In addition, Figure 8. Temperature distribution of hot fluid with different channel diameter. Figure 9 shows the Nu distribution of hot fluid in the channels with different diame- ters. Table 4 shows the average Nu and total pressure drop of hot fluid. It can be seen from Figure 9 that, when the incline angle of the wavy channel was equal to 0° and 15°, the Nu - h 1 d - m uPDF Image | Thermal–Hydraulic Performance of a Printed Circuit Heat Exchanger
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