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Applications: Engineering with Ceramics
Published in David W. Richerson, William E. Lee, Modern Ceramic Engineering, 2018
David W. Richerson, William E. Lee
The layered design involves a plate–fin concept such as illustrated in Figure 3.8. Note that alternating layers have flow channels at 90° to each other to provide a cross-flow pattern between the hot gases and cold gases. The “plates” separate the hot-gas layers from the cold-gas layers. The “fins” provide high surface area to enhance heat transfer efficiency and to provide structural strength. As an alternative to the rectangular channels, the fins can be in a sinusoidal pattern to yield a corrugated appearance similar to cardboard. A plate–fin heat exchanger can be relatively compact compared to tubular heat exchanger.
Recent Progress on High Temperature and High Pressure Heat Exchangers for Supercritical CO2 Power Generation and Conversion Systems
Published in Heat Transfer Engineering, 2023
The diffusion-bonded plate-fin heat exchanger is a type of compact heat exchanger that consists of a stack of alternate flat plates and corrugated fins, and the joining is accomplished by diffusion bonding to form a solid block of metal with flow passages passing through it. The thermal operational limits of the plate fin style cores depend on the type of materials used and are generally more suitable to lower pressure applications up to 200 bars, which are lower than those of printed circuit style cores [46]. Plain, perforated, offset-strip, louvered, wavy fin geometries have been used in the design of plate-fin heat exchangers for heat transfer enhancement. Plate-fin heat exchangers have been applied in power and energy industries, and a growing research activity is under way on the development of diffusion-bonded plate-fin heat exchangers for supercritical CO2 cycles. The supercritical CO2 flows through the internal fin-supported passages and distributes and collects at the two ends of the header blocks, while the hot air or flue gas flow crosses between the fins. However, studies on general fin performance and applicable fin selection strategies at high temperature and high pressure are limited.
Enhancement of Heat Transfer for Plate Fin Heat Exchangers Considering the Effects of Fin Arrangements
Published in Heat Transfer Engineering, 2018
In Figure 12, cold fluid temperature variations on the channel top surface for fin types of B and C under parallel and counter flow are shown. When the development distance of the first temperature variation is 0.1065 m from the beginning of a flat channel, it is 0.045 m for a channel with fin type of C under parallel flow. As can be seen in Figure 12, for both flow types the temperature gradient distance for fin type of C improves earlier than fin type of B which has lower temperature values of cold fluid. Besides, it is clearly seen that for fin types of B and C larger temperature values are obtained compared to a flat channel. Consequently, it can be said that the use of fins effectively improves the heat transfer performance of a plate fin heat exchanger by enhancing the currents of turbulence and heat transfer surface area.
Research on low-temperature performance of plate-fin hydrogen preheater for a proton-exchange membrane fuel cell
Published in International Journal of Green Energy, 2021
Qinguo Zhang, Zheming Tong, Shuiguang Tong, Zhewu Cheng
Through the study of the icing mechanism of the fuel cell during the cold start, the whole process of the water generation from the fuel cell to the icing during the cold start and the distribution of voltage, current, and temperature were clarified (Wang et al. 2019). The lower anode inlet temperature also adversely affects the life of the MEA, so it is necessary to use an efficient and compact heat exchanger to preheat the hydrogen (Yang et al. 2019). The plate-fin heat exchanger is a new type of high-efficiency radiator formed by stacking a series of metal sheets with a certain shape, which performs heat exchange through the plates (William et al. 2019). Taler and Taler. (2019) used the least square method to determine the new empirical heat transfer relationship between the air and water sides. Cai et al. (2019) optimized the number and spacing of different fins and found that in all cases, thinner and narrower airflow channels with fins can make heat transfer better. Zhu and Ayush, Kumar, and Patil. (2019) found that the uneven distribution of gas-liquid mixtures would have a serious impact on the heat transfer performance of plate-fin heat exchangers. () Sarafraz et al. (2017) found that the particle fouling continuously forms on the inner wall of the heat exchanger, which can improve the roughness, friction coefficient, and pressure drop of the heat exchanger. Wang et al. (2018) studied the effect of the concentration of ethylene glycol-water on the thermal and hydraulic properties of nanofluids based on a plate heat exchanger. Ramtin, Moraveji, and Aloueyan. (2016) experimentally studied the effects of nanofluids on heat transfer enhancement and pressure drop of plate heat exchangers. Based on the analysis of the above literatures, there are few studies on the effect and influencing factors of hydrogen preheating by plate-fin heat exchangers.