Review
Thermodynamics
Akash Dwivedi, Mohammad Mohsin Khan, Harveer Singh Pali
Summary: A novel framework has been employed to enhance heat transfer in heat exchangers through microchannels. The use of nanofluids as working fluids shows better thermal behavior. Flow disrupters and ceramic microchannels can also improve heat transfer performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Zhengyong Jiang, Mengjie Song, Chaobin Dang, Yuyan Jiang, Man Pun Wan, Christopher Yu Hang Chao
Summary: This study aims to optimize the heat transfer capabilities of heat exchangers by analyzing the effect of expanding microchannels on flow instability. It was found that the mean deviations in the models for two heat exchangers with and without cross-cutting were 10.03% and 5.95%, respectively. When increasing the number of cross-cutting plates, the maximum increase in heat transfer coefficient was 58.17 kW/(m(2)center dot K). Additionally, adding fins in downstream channels can further stabilize the flow, and moving the position of the fins downstream can increase the heat transfer coefficient of the heat exchanger by 26.58%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mengjie Song, Jiang Zhengyong, Dang Chaobin, Jiang Yuyan, Shen Jun, Luo Xiaoyan
Summary: Flow boiling heat transfer in microchannels is widely used to solve the heat dissipation problem of high heat flux devices. Experimental studies and mathematical modeling were conducted to optimize the heat transfer performance of rectangular radial microchannel heat exchangers with and without grooves. The results showed that heat exchangers with grooves had better heat transfer performance and adjusting structural parameters significantly influenced the heat transfer coefficient.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Tingbo Hou, Danmin Xu
Summary: This study investigates the influence of the ellipticity of an elliptical concave cavity on the pressure drop and heat transfer performance of a microchannel heat exchanger (MHE). The results show that an MHE with ellipticity 1.0 exhibits the best pressure drop and heat transfer performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Ruozhou Du, Junjia Zou, Jiabao An, Long Huang
Summary: This research conducted an in-depth review of mathematical models for heat exchanger performance prediction and found that the existing iterative methods are computationally expensive and have limitations based on the assumption of adiabatic fin tips. To address these issues, a systematic regression approach was developed, improving the accuracy and calculation speed of performance prediction.
APPLIED THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
C. P. Liang, F. Ture, Y. J. Dai, R. Z. Wang, T. S. Ge
Summary: This paper studied a series of condensation experiments on a desiccant coated microchannel heat exchanger under high temperature and high humidity conditions, discussing the dynamic characteristics and parametric effects, finding stable performance of DCMHE under continuous condensation conditions, and proposing an optimal range for inlet air velocity.
ENERGY AND BUILDINGS
(2021)
Article
Chemistry, Multidisciplinary
Tong Xiong, Guoqiang Liu, Gang Yan
Summary: In this study, a modified microchannel heat exchanger (MCHX) with extended fins was developed to improve frost performance. Compared to conventional MCHX, the modified MCHX distributes frost more evenly and has higher heat transfer capacity and accumulated frost mass during the 60-minute frosting cycle. Furthermore, the modified MCHX has greater potential to improve thermal-hydraulic performance under uneven frost layer distribution conditions. The purpose of this work is to provide useful guidance for the optimal design of MCHX under frosting conditions.
APPLIED SCIENCES-BASEL
(2023)
Article
Thermodynamics
Bo Shen, Zhenning Li, Kyle R. Gluesenkamp
Summary: The study evaluates two residential split heat pumps using low-GWP refrigerants R452B and R454B, compared to R410A. Results show that R452B and R454B are viable replacements for R410A in heat pumps, but with lower capacities. Performance varies depending on the type of heat exchangers used.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Hongliang Qian, Pega Hrnjak
Summary: This study experimentally measured the void fraction in headers of microchannel heat exchangers and found a strong correlation between void fraction, local quality, and refrigerant distribution in the tubes. A drift-flux void fraction model based on local variables was proposed for predicting void fraction in headers with better accuracy compared to widely used correlations.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Nazanin Abdi, Mohammad Samipoorgiri, Alimorad Rashidi, Ashkan Zolriasatein
Summary: This study investigated the impact of nanofin array coatings on the overall heat transfer coefficient (U-Value) of a micro-channel heat exchanger. By electrodeposition, dendritic copper nanofin arrays were grown on copper plates, leading to an increase of 41-135% in the U-Value compared to the non-coated versions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Mechanics
Samer Ali, Talib Dbouk, Mahmoud Khaled, Jalal Faraj, Dimitris Drikakis
Summary: Concentric tube heat exchangers play a vital role in many industries, and this study explores the optimization of flow and heat transfer by morphing the tube's walls. The results show significant improvements in heat transfer with the morphed design compared to straight concentric tube designs.
Article
Energy & Fuels
Qingzi Zhu, Mehdi Pishahang, Michael Bichnevicius, Caleb Amy, Mario Caccia, Kenneth H. Sandhage, Asegun Henry
Summary: Compact heat exchangers have gained attention in demanding applications. Flow maldistribution is traditionally believed to affect heat exchanger effectiveness, but recent research suggests that mismatch in maldistribution is the dominant factor. Matching the flow rates between fluid streams can improve heat exchanger performance.
Article
Thermodynamics
Allison J. Mahvi, Kalyan Boyina, Andy Musser, Stefan Elbel, Nenad Miljkovic
Summary: The study focuses on improving the efficiency of cabin heating in electric vehicles by replacing resistive heating elements with an air-source heat pump system. Surface wettability modification of aluminum heat pump evaporators showed that superhydrophobic outer surface could delay frost formation and maintain higher heat transfer rates. This research has the potential to increase the efficiency of automotive heat pumps and reduce energy consumption of electric vehicles.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Manufacturing
Mehdi Mortazavi, Seyed A. Niknam, Mahbod Heidari, Riccardo C. Clemente
Summary: In this study, three manifold-microchannel heat exchangers were additively manufactured by direct metal laser sintering. The performance of these heat exchangers was comparable despite slight interior design modifications, achieving efficient heat transfer under different air and water flow rates. The experimental results showed that the heat exchangers demonstrated high heat transfer rates, air-side convection heat transfer coefficients, and air-side pressure drops, with the heat exchanger A exhibiting the lowest pressure drop among the three variants.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2021)
Article
Thermodynamics
Jia Tang, Minyun Liu, Yanping Huang, Guangxu Liu, Jinguang Zang, Shenghui Liu
Summary: This study analyzes the effect of manufacturing deviations on the thermohydraulic performance of printed circuit heat exchangers (PCHEs) and proposes a model to estimate the relative deviation of the channel hydraulic diameter after bonding. The results show that etching-induced deformations have a relatively small impact on performance, while the channel cross-section shape and longitudinal pitch have a more significant influence. The deformation of channels after diffusion bonding can cause large deviations in thermal-hydraulic characteristics.
APPLIED THERMAL ENGINEERING
(2023)