Review
Green & Sustainable Science & Technology
D. L. Shukla, K. V. Modi
Summary: This article introduces the working principle of liquid desiccant-operated evaporative cooling systems (LDECS) and the differences with conventional vapor compression refrigeration systems (VCRS). It discusses various components, features, and advancements of LDECS, as well as the influence of different input parameters on performance indices and overall performance. Finally, key conclusions and future research directions are summarized concisely.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Review
Thermodynamics
A. Gurubalan, J. Carey Simonson
Summary: Liquid desiccant air conditioning systems are an efficient alternative to conventional systems, but further research is needed to address practical challenges and improve their performance in real-world applications.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Review
Thermodynamics
Andrew A. Y. Oyieke, Freddie L. Inambao
Summary: The paper presents a comprehensive technical review of liquid desiccant dehumidification and regeneration techniques, covering operational features, processes, and performance indices of various flow configurations. Heat and mass transfer assessment is discussed in terms of experimental and modelling evaluations, with existing adiabatic dehumidifier/regenerator models compared in detail. Solar regenerator models are highlighted, with an outline of ideal settings, formulation procedures, current state-of-the-art, and opportunities for improvement.
INTERNATIONAL JOURNAL OF LOW-CARBON TECHNOLOGIES
(2021)
Article
Thermodynamics
Bowen Guan, Xiaohua Liu, Tao Zhang
Summary: A concise correction method for deep dehumidification is proposed to modify analytical solutions, achieving good agreement with experimental data, showing that the dehumidifier has higher enthalpy and moisture efficiencies compared to the regenerator under the same conditions. This study helps understand the efficiency difference between conventional and deep dehumidification, as well as the performance gap between the dehumidifier and regenerator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Energy & Fuels
Sebastian Englart, Krzysztof Rajski
Summary: The study investigates the use of a membrane module for air dehumidification and regeneration of liquid desiccant, determining the most favorable operating conditions through numerical simulations and experimental validation. Operating conditions significantly impact dehumidification performance, with recommended ranges for inlet solution temperature and packing fraction identified. These findings can help in designing membrane-based liquid dehumidification systems.
Article
Engineering, Multidisciplinary
Sudhakar Kalpana, Sudhakar Subudhi
Summary: The liquid desiccant cooling system (LDCS) is a viable alternative to conventional air conditioning systems in hot and humid climates due to its use of low-grade energy and environmental friendliness. This study focuses on building a compact system by combining a dehumidifier and a regenerator into a single unit. Experimental research shows that inlet air-specific humidity and solution volume flow rate have a significant impact on system performance.
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2023)
Article
Thermodynamics
Hao Lu, Lin Lu
Summary: The study found that using a rough plate can significantly enhance dehumidification performance of falling film liquid desiccant dehumidifiers, up to 30.9% enhancement. The mechanisms of dehumidification enhancement by the rough plate include liquid film waves, flow vortex, and high-value TKE near the gas-liquid interface.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Energy & Fuels
Anita A. Nene, Solaisamy Ramachandran
Summary: The liquid desiccant dehumidifier with Indirect Evaporative Cooling (IEC) system is a suitable alternative for hot and humid climatic conditions. Experimental results suggest that a polymer plate heat exchanger-based system is more efficient than metal plate heat exchanger systems. Increasing desiccant flow rate leads to higher carry over losses.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Thermodynamics
Cong Wang, Bianfeng Yang, Xu Ji, Ren Zhang, Hailong Wu
Summary: This study proposes an activated carbon/silica gel/lithium chloride composite desiccant (AC-SL) for air dehumidification. The AC-SL exhibits enhanced adsorption capacity and thermal conductivity, achieving a dehumidification capacity of 0.81 kg kg(-1) at 60% relative humidity.
Article
Thermodynamics
Qing Cheng, Han Wang, Lin Liu
Summary: The dehumidification air-conditioning system solution has great energy-saving potential in humid areas. Electrodialysis regeneration is suitable for liquid desiccants in humid areas, improving system performance by enhancing the mass transfer coefficient of the liquid desiccant. Experimental verification confirms the accuracy of the theoretical models.
Article
Construction & Building Technology
Lixia Wen, Huangxi Fu, Jiachun Hu, Shunyi Huang
Summary: Indoor volatile organic compounds (VOCs) have a serious impact on human health. Liquid dehumidification shows a potential to remove VOCs during dehumidification process. This study proposes an analytical solution to characterize heat-moisture-VOCs transfer performance in liquid dehumidifier. The influences of some key operating parameters on VOCs removal performances are demonstrated using the proposed analytical solution.
BUILDING AND ENVIRONMENT
(2023)
Article
Thermodynamics
Donggen Peng, Nanyang Cheng
Summary: This paper establishes an experimental device for falling film dehumidification of circular tube, and investigates the effects of desiccant inlet concentration, velocity, temperature, air inlet velocity, temperature, and moisture content on heat and mass transfer dynamic process through experiments and CFD model. The results show a good agreement between CFD simulation and experimental results, with an average error of 4%. Analysis of the heat and mass transfer and desiccant flow process inside the dehumidifier is also conducted.
EXPERIMENTAL HEAT TRANSFER
(2022)
Article
Engineering, Chemical
Woo-Jin Jeon, Min-Gyu Ham, Jung-Gil Lee, Ho Ji, Young-Deuk Kim
Summary: This study developed a regeneration module using a membrane distillation mechanism, and its performance was evaluated theoretically and experimentally. The results demonstrated that the regeneration module with spacers had higher permeate flux compared to the empty channel, achieving a high permeate flux at a solution temperature of 50 degrees C.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Construction & Building Technology
Xiaobo Zhang, Yuxian Zhu, Xiangguo Xu, Xiaosheng Ji
Summary: Liquid desiccant dehumidifiers (LDDs) have attracted attention for their energy saving and environmental advantages. This study investigates the dynamic characteristics of a packed LDD, revealing that the air outlet humidity ratio is more sensitive to changes in desiccant or air flow rate rather than desiccant inlet temperature. Control algorithms developed based on dynamic characteristics outperform those based on steady state characteristics, suggesting the need for further research in developing appropriate control algorithms for LDDs.
ENERGY AND BUILDINGS
(2021)
Article
Thermodynamics
Lili Yu, Jubair A. Shamim, Wei-Lun Hsu, Hirofumi Daiguji
Summary: This study proposed a comprehensive analysis and optimization of a novel air dehumidification system, establishing a mathematical model to predict transient heat and mass transfer, analyzing the system's cyclic performance, optimizing operating parameters using neural networks and genetic algorithms, and identifying the trade-off relation between energy efficiency and dehumidification performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Juan Shi, Xi Jia, Dongyang Feng, Zhenqian Chen, Chaobin Dang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Song Mengjie, Dang Chaobin, Hihara Eiji
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Thermodynamics
Sihui Hong, Chaobin Dang, Eiji Hihara
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
Dongnan Cai, Xiaoxiao Xu, Shijie Zhang, Chao Liu, Chaobin Dang
Summary: The study focuses on the heat transfer deterioration and flow instability of supercritical CO2 in a tube, where experiments show that flow instability occurs in upward flow tubes due to buoyancy effects and changes in heat transfer modes.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Zhihua Zhang, Makoto Ito, Chaobin Dang, Yu Chen, Eiji Hihara
Summary: This study aimed to explore the possibility of commercializing split air conditioners using HFO-1123, requiring the development of technology to suppress its disproportionation reaction. The threshold pressure and flame temperature of the disproportionation reaction were experimentally determined, and the effectiveness of using different inhibitors to suppress the disproportionation reaction was evaluated.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Thermodynamics
Xinxin Liu, Xiaoxiao Xu, Youzhou Jiao, Chao He, Liang Liu, Chaobin Dang
Summary: The study investigates the mixed turbulent convection heat-transfer characteristics of S-CO2 heated in both vertical and horizontal oriented HC-tube, finding that the coupling effects of buoyancy and centrifugal forces mainly affect heat transfer on the inside of a cross-section and the M-type velocity pattern in HC-tube is different from that in straight tube.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Jiacheng He, Ryusuke Hirata, Eiji Hihara, Chaobin Dang
Summary: The membrane-based desorber offers a promising alternative for miniaturizing the present generator in absorption refrigeration systems by virtue of its large specific interfacial area; the heat and mass transfer characteristics of a desorber consisting of a porous polytetrafluoroethylene hollow fiber membrane were evaluated through experiment and simulation; the results showed an increase in solution flowrates leading to a higher water vapor desorption rate.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Shizuo Saitoh, Tomohiro Higashi, Makoto Ito, Chaobin Dang, Eiji Hihara, Yuji Shitara
Summary: By conducting experiments on the combustion of refrigeration oil, refrigerant, and air mixtures, it was found that the concentration of reaction inhibitors in the refrigeration oil has an effect on combustion suppression. The combustion range became narrower and the maximum pressure decreased as the concentration of the additive increased.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Thermodynamics
Zhihua Zhang, Makoto Ito, Chaobin Dang, Yu Chen, Eiji Hihara
Summary: HFO-1123 is a promising refrigerant with low global warming potential. The addition of other refrigerants was investigated to suppress the disproportionation reaction of HFO-1123. Experimental results showed that a narrow slit in the center can cool and extinguish the flame ignited at the bottom of the vessel under high-temperature conditions.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Thermodynamics
Yong Cao, Xiaoxiao Xu, Dan Li, Chao Liu, Chaobin Dang
Summary: This study investigates the heat transfer characteristics of supercritical CO2 (S-CO2) in a smooth tube and a smooth tube with Helmholtz oscillators. The results show that the heat transfer deterioration of S-CO2 can be significantly inhibited by the Helmholtz oscillator. The pulsating flow generated by the oscillator enhances the disturbance between near-wall fluid and core fluid, resulting in more uniform thermophysical properties of S-CO2 and weaker buoyancy effect.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Yingling Li, Minxia Li, Chaobin Dang
Summary: Utilizing the frosting-defrosting process is a simple and novel method for dust removal in heat exchangers. The effect of surface wettability on dust removal characteristics during the frosting cleaning process was studied through experiments on four types of copper surfaces. Results showed that hydrophilic, bare, and sliding surfaces effectively removed dust particles, while super-hydrophobic surfaces wrapped dust particles into the curling frosting layer. The super-hydrophobic surface had the highest dust removal rate and the shortest defrosting time.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Jiangchuan Yu, Sihui Hong, Sasaki Koudai, Chaobin Dang, Shuangfeng Wang
Summary: This paper introduces a flat plate pulsating heat pipe (ASCPHP) with adaptive structured channels to enhance the thermal performance of PHP systems. Compared to traditional PHP systems, the ASCPHP design achieves a lower evaporation temperature and a more uniform temperature distribution, reducing thermal resistances by up to 37.5%. Experimental results show that the ASCPHP exhibits the quickest start-up response and the lowest start-up temperature, with minimal dependence on gravity.
Article
Thermodynamics
Qifan Wang, Xuetao Liu, Minxia Li, Dandan Su, Chaobin Dang
Summary: This study investigates the replacement of high-GWP refrigerants with non-azeotropic refrigerants and the reduction in refrigerant charge. A numerical simulation of falling-film evaporation of a non-azeotropic refrigerant outside a horizontal tube was conducted, considering various influencing factors on the heat transfer coefficient. The results indicate that spray height, tube diameter, inlet temperature, Reynolds number, and the mass fraction of R32 in the liquid-phase mixture have significant effects on the heat transfer coefficient.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Linlin Wang, Chaobin Dang, Eiji Hihara, Baomin Dai
Summary: The use of minichannel heat exchangers in refrigeration and other industries has been increasing due to their high heat transfer efficiency, lightweight, and low carbon emissions. R1234yf/R32, a zeotropic mixture with low GWP, shows promise as a substitute for R410A in commercial refrigeration. This study investigates the condensation heat and mass transfer characteristics of R1234yf/R32 in minichannel test tubes with an inner diameter of 2 mm. The influencing factors on mass transfer and heat transfer coefficient are discussed, and the effects on heat transfer and mass transfer during condensation are analyzed based on the flow pattern and thermophysical properties.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Sihui Hong, Chengzhi Li, Chaobin Dang, Mengjie Song, Hitoshi Sakamoto
Summary: This study investigates the cooling performance of two heat sinks connected in series or in parallel by adjusting the heat load. The results show that when the heat sinks are connected in parallel, the inlet flowrate is evenly distributed and their heat transfer performance is identical. A sudden change in the heat load of one heat sink does not induce flow instability or heat deterioration in the other heat sink.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
