Investigation on the effects of narrowed channel cross-sections on the heat transfer performance of a wavy-channeled PCHE

Yang, Yu; Li, Hongzhi; Yao, Mingyu; Gao, Wei; Zhang, Yifan; Zhang, Lei

doi:10.1016/j.ijheatmasstransfer.2019.01.044

Cited by 50 publications

(9 citation statements)

References 24 publications

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“…The standard deviations between the experimental data and average Nusselt number correlation/average Fanning factor correlation were 0.0389 and 0.2935, respectively, and the channel averaged Nusselt number and average Fanning factor were predicted within 9.23% and 3.0% by Eqs. ( 14) and (16), respectively. The cold and hot outlet temperatures calculated by Eq.…”

Section: Mesh Generation and Code Validationmentioning

confidence: 99%

“…The thermal and hydraulic correlations including the average Nusselt number, local pitch-averaged Nusselt number, and average Fanning factor for the comparison are described as Nu ¼ 4:065 þ 0:00305Re, 350 < Re < 800 (15) f Re b ¼ 16:51 þ 0:01627Re b , 350 < Re < 1200 ( 16)…”

Section: Mesh Generation and Code Validationmentioning

confidence: 99%

“…The comparison of heat flux and average Prandtl number in the zigzag channel PCHE for different wall thermal conductivity is shown in Figure 19, and it is found that the heat flux and average Prandtl number decrease with the increase of wall thermal conductivity at the same mass flux or at the same average Reynolds number. Based on the numerical results, compared with the case of wall thermal conductivity of 45 W/(mÁK), the heat flux with wall thermal conductivity of 5 W/(mÁK) and 15 W/(mÁK) increases by 16.7% and 11.6% at G ¼ 1.4 kg/(m 2 Ás), 4.0% and 3.2% at G ¼ 5.6 kg/(m 2 Ás), and 0.4% and 0.3% at G ¼ 22.4 kg/(m 2 Ás), respectively, and the average Prandtl number with wall thermal conductivity of 5 W/(mÁK) and 15 W/(mÁK) increases by 14.4% and 6.8% at G ¼ 1.4 kg/(m 2 Ás), 5.0% and 3.0% at G ¼ 5.6 kg/(m 2 Ás), and 2.5% and 1.0% at G ¼ 22.4 kg/ (m 2 Ás), respectively. The comparative results indicate that the reduction of the wall thermal conductivity can improve the thermal performance of the PCHE due to the influence of axial heat conduction in the separating wall.…”

Section: Effect Of Wall Thermal Conductivity On the Axial Heat Conducmentioning

confidence: 99%

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Thermal Performance Analysis in a Zigzag Channel Printed Circuit Heat Exchanger under Different Conditions

Tang

Yang

Pan

et al. 2021

Heat Transfer Engineering

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In this study, the effect of axial heat conduction on thermal performance in a zigzag channel printed circuit heat exchanger (PCHE) with supercritical liquefied natural gas as the working fluid is studied by a numerical method under different conditions. The influence factors include Reynolds number, operating pressure, inlet temperatures of the cold side, and wall thermal conductivity. The results indicate that the axial heat conduction can greatly affect the thermal performance of the PCHE at low Reynolds numbers but decrease it at high Reynolds numbers for different working conditions. At the same average Reynolds number, the thermal performance of the PCHE decreases as the pressure increases, and the inlet temperature of 195 K provides the best thermal performance while the inlet temperature of 220 K is the worst among the three different inlet temperatures of the cold side. Furthermore, the reduction of wall thermal conductivity can improve the thermal performance of the PCHE due to the influence of axial heat conduction in the separation wall.

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Section: Mesh Generation and Code Validationmentioning

confidence: 99%

Section: Mesh Generation and Code Validationmentioning

confidence: 99%

Section: Effect Of Wall Thermal Conductivity On the Axial Heat Conducmentioning

confidence: 99%

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Thermal Performance Analysis in a Zigzag Channel Printed Circuit Heat Exchanger under Different Conditions

Tang

Yang

Pan

et al. 2021

Heat Transfer Engineering

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“…It needs to be pointed out that for each unit cycle, its thermal performance will increase with the increase of the amplitude, but will decrease with the increase of the cycle. Yang et al [114] found that the heat flux distribution on the surface of wavy channel changes periodically through numerical simulation. In each cycle, there is a low heat conduction band area on the arch surface and two low heat conduction band areas on the bottom surface.…”

Section: Pche With Wavy Channelsmentioning

confidence: 99%

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Liao

Zhang

et al. 2021

Energies

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Heat exchangers play an important role in power, the chemical industry, petroleum, food and many other industrial productions, while compact heat exchangers are more favored in industrial applications due to their high thermal efficiency and small size. This paper summarizes the research status of different types of compact heat exchangers, especially the research results of heat transfer and pressure drop of printed circuit heat exchangers, so that researchers can have an overall understanding of the development of compact heat exchangers and get the required information quickly. In addition, this paper summarizes and analyzes several main working fluids selected in compact heat exchangers, and puts forward some discussions and suggestions on the selection of working fluids. Finally, according to the existing published literature, the performance evaluation indexes of compact heat exchangers are summarized and compared, which is convenient for developers and researchers to better grasp the design direction.

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“…Hence, it is necessary to study the thermal performance of the regenerator in the loop. The printed circuit heat exchanger is characterized by its compactness, high efficiency, and high resistance to temperature and pressure making it suitable for use in the S-CO2 Brayton cycle [13]. However, due to the complexity of the flow channel shape and the instability of the physical properties of the supercritical heat transfer medium, the heat transfer mechanism is not very clear.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Thermal-Hydraulic Performance of a New Spiral Z-Type PCHE for Supercritical CO2 Brayton Cycle

Zhao

Wang

et al. 2021

Energies

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Printed circuit heat exchangers (PCHEs) have the characteristics of high temperature and high pressure resistance, as well as compact structure, so they are widely used in the supercritical carbon dioxide (S-CO2) Brayton cycle. In order to fully study the heat transfer process of the Z-type PCHE, a numerical model of traditional Z-type PCHE was established and the accuracy of the model was verified. On this basis, a new type of spiral PCHE (S-ZPCHE) is proposed in this paper. The segmental design method was used to compare the pressure changes under 5 different spiral angles, and it was found that increasing the spiral angle θ of the spiral structure will reduce the pressure drop of the fluid. The effects of different spiral angles on the thermal-hydraulic performance of S-ZPCHE were compared. The results show that the pressure loss of fluid is greatly reduced, while the heat transfer performance is slightly reduced, and it was concluded that the spiral angle of 20° is optimal. The local fluid flow states of the original structure and the optimal structure were compared to analyze the reason for the pressure drop reduction effect of the optimal structure. Finally, the performance of the optimal structure was analyzed under variable working conditions. The results show that the effect of reducing pressure loss of the new S-ZPCHE is more obvious in the low Reynolds number region.

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Investigation on the effects of narrowed channel cross-sections on the heat transfer performance of a wavy-channeled PCHE

Cited by 50 publications

References 24 publications

Thermal Performance Analysis in a Zigzag Channel Printed Circuit Heat Exchanger under Different Conditions

Thermal Performance Analysis in a Zigzag Channel Printed Circuit Heat Exchanger under Different Conditions

A Review on the Thermal-Hydraulic Performance and Optimization of Compact Heat Exchangers

Numerical Study of Thermal-Hydraulic Performance of a New Spiral Z-Type PCHE for Supercritical CO2 Brayton Cycle

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