An approach to the analysis of heat and mass transfer characteristics in indirect evaporative cooling with counter flow configurations

Wan, Yangda; Ren, Chong; Xing, Li

doi:10.1016/j.ijheatmasstransfer.2017.01.019

Cited by 53 publications

(9 citation statements)

References 28 publications

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“…Recently, the control volume finite element method (CVFEM) has been developed. 19 − 21 The broad literature review shows that the unstructured mesh control volume methods have been used to simulate the physics of transport (heat and mass) in porous media. 22 …”

Section: Introductionmentioning

confidence: 99%

Enhancement of 3D Mass and Heat Transfer within a Porous Ceramic Exchanger by Flow-Induced Vibration

et al. 2022

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This work investigates heat transfer enhancement for a porous ceramic heat exchanger. The effect of flow-induced vibration of exchanging air flow through porous tube banks has been tested. A numerical model able to assess the vibration effect on heat and mass transfer inside a porous ceramic exchanger has been carefully developed. A three-dimensional unstructured control volume finite element method (CVFEM) is developed to simulate the transport phenomena that arise during convective exchange. In this respect, several numerical tests have been conducted. The time evolution of temperature, liquid saturation, and pressure of the porous domain are analyzed and compared for two cases: with and without vibration. It is found that the vibration highly enhances the heat and mass transfer inside the ceramic exchanger. As a result, the gain of exchanging time to reach the thermal equilibrium between the hot air and the porous domain was 75% for the case of air vibration under sawtooth type at a frequency of f v = 5 Hz and V max = 10 m/s compared to nonvibrating exchange.

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Section: Introductionmentioning

confidence: 99%

Enhancement of 3D Mass and Heat Transfer within a Porous Ceramic Exchanger by Flow-Induced Vibration

et al. 2022

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“…However, these methods are not well-known to most HVAC engineers, and the related results are not commonly used. There are two typical types of evaporative cooling systems: direct and indirect which have been used in dry climatic conditions (Wan et al, 2017). The maximum temperature drop of the supply air is the difference between the dry bulb temperature and the wet bulb temperature of the incoming air, and the actual temperature difference is smaller.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on performance of the dew point evaporative cooling system

Liu

Jing

Zhao

et al. 2021

JTST

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The dew point evaporative air conditioning system has gradually become an attractive research area in recent years because of its low energy consumption and environmental friendly advantage. How to improve the system efficiency is the focus of current research. This paper presents the theoretical performance of the dew point evaporation model with or without perforations. The heat and mass transfer model of the dew point evaporative cooling system was established and solved. It was found that the optimal supply air ratio was 0.7-0.8 and the value of the channel height was 4mm-5mm according to the evaluation parameter of the cooling capacity. Compared with other parameters, the supply air ratio has a more significant effect on the performance of the perforated cooling system. Single perforation has the best cooling system performance with supply air ratio of 0.5-0.7. Two perforations is the best for supply air ratio 0.3-0.4, while three perforations is more appropriate when supply air ratio is 0.2.

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“…They concluded that lower inlet temperature and relative humidity could obtain lower outlet temperature and moisture content. Wan et al [17] developed a new approach to investigate the coupled heat and mass transfer characteristics in an indirect evaporative cooling with counter-flow configurations. In their study, the effects of different parameters on the average Nusselt and Sherwood numbers were examined in detail.…”

Section: Introductionmentioning

confidence: 99%

A parametric study of the heat exchanger copper coils used in an indirect evaporative cooling system

2019

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Due to the lower energy consumption in the evaporative cooling, it is the subject of numerous studies. Evaporative cooling considers a green cooling system which does not require any chemical reaction and does not depend on the hazardous material. The present study mainly focused on parametric analysis of an indirect evaporative cooling system using the computational fluid dynamics method. The numerical simulation of an indirect evaporative cooling system was carried out using ANSYS Fluent 18.2. The effects of the water inlet velocity, air inlet velocity, coil diameters (d c ) and the number of the heat exchanger copper coils were numerically investigated. The flow was considered as threedimensional, turbulent, and incompressible. The results indicated that the increment of the coil diameter and water inlet velocity had a positive effect on the performance of the indirect evaporative cooling system. The maximum water outlet temperature was obtained at 285.05 K for the water inlet velocity of 0.5 m/s. Moreover, the saturation efficiency is decreased by increasing air inlet velocity. On the other hand, saturation efficiency was increased at all air inlet velocities by increasing the coil diameter.

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An approach to the analysis of heat and mass transfer characteristics in indirect evaporative cooling with counter flow configurations

Cited by 53 publications

References 28 publications

Enhancement of 3D Mass and Heat Transfer within a Porous Ceramic Exchanger by Flow-Induced Vibration

Enhancement of 3D Mass and Heat Transfer within a Porous Ceramic Exchanger by Flow-Induced Vibration

Numerical study on performance of the dew point evaporative cooling system

A parametric study of the heat exchanger copper coils used in an indirect evaporative cooling system

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