Two-dimensional numerical study of a heat and mass exchanger for a dew-point evaporative cooler

Liu, Yuting; Li, Jun Ming; Yang, Xu; Zhao, Xudong

doi:10.1016/j.energy.2018.11.135

Cited by 38 publications

(16 citation statements)

References 25 publications

(30 reference statements)

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“…Comparison of the experimental results of tests 6, 7 and 8 shows that the product air temperature decreases with decreasing water temperature for a given volumetric water flow rate. These influences of the water on the cooling of dew-point evaporative coolers agree with the effects seen in the numerical study by Liu et al [36] .…”

Section: Experimental Results Discussionsupporting

confidence: 90%

“…When there is not enough water to wet the surface, the heat and mass transfer will decrease and the product air temperature will rise. So, there must be a best water flow volume for a given water temperature as discussed in [36] .…”

Section: Experimental Results Discussionmentioning

confidence: 99%

“…(c) The wet channel wall is completely wetted by water. (d) The air flow in the wet channel is uniform[36] .…”

mentioning

confidence: 99%

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Experimental and numerical investigation of a high-efficiency dew-point evaporative cooler

Liu

Akhlaghi

Zhao

et al. 2019

Energy and Buildings

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This paper investigated the cooling performance of a high-efficiency dew-point evaporative cooler with optimised air and water flow arrangement using the combined experimental and numerical simulation method. The experimental results showed that the wet-bulb efficiency of the dew-point evaporative cooler was increased by 29.3% and COP was increased by 34.6%, compared to the existing commercial dew point air cooler of the same capacity. An improved two-dimensional, multi-factor engaged numerical model which can scale up and optimize the size and capacity of the cooler was developed. The numerical predictions agreed well with the experimental results, indicating that the cooling rate of the dew-point evaporative cooler is influenced by the dew-point evaporative cooler structure. The cooling efficiency of the dew-point evaporative cooler with corrugated plates is more than 10% higher than with flat plates and the cooling efficiency of the dew-point evaporative cooler with the actual flow arrangement is only 62%-67% that of a dew-point evaporative cooler with an ideal counter-flow arrangement. The cooling efficiency can be improved by increasing the channel length and the air entrance length, and decreasing the channel width and channel gap within a reasonable range.

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Section: Experimental Results Discussionsupporting

confidence: 90%

Section: Experimental Results Discussionmentioning

confidence: 99%

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Experimental and numerical investigation of a high-efficiency dew-point evaporative cooler

Liu

Akhlaghi

Zhao

et al. 2019

Energy and Buildings

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“…Liu et.al. [8] proposed the numerical model which was subsquently cross checked experimentally with the similar results obtained from various investigations. The significance of the model extended to investigate the different working parameters such as intake discharge of air, air ratio, intake temperature of water, discharge of water along with temperature and moisture content for the intake air related to refrigeration capacity on the modified construction of the device.…”

Section: Theoretical Research Of Dew Point Coolersmentioning

confidence: 79%

A Review of Recent Experimental and Theoretical Research of Dew Point Evaporative Coolers

Patunkar¹,

Dingare²,

Bhojwani³

2020

E3S Web Conf.

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Evaporative cooling is one of the techniques to lower the ambient air temperature according to the requirements. The technique includes the injection of moisture in the coming air, thus increasing its specific humidity. This technique can cool the air up to wet bulb temperature of the incoming air. In the recent past, the techniques are developed to lower the temperature of air without addition of moisture in the incoming air. These techniques demonstrate that the incoming air temperature can be approached near the dew point temperature of the incoming air. The present paper essentially focuses on the recent theoretical and experimental research of dew point evaporative coolers. Different flow configurations of heat exchange mediums, optimization of geometrical parameters, performance parameters (wet bulb and dew point effectiveness), energy efficiency ratio and energy saving potential are the key elements to study the prospects of dew point evaporative coolers over the conventional refrigeration systems operated by mechanical means. Dew point evaporative cooling technology is environmental friendly and has the potential in reducing the impact on earth due to global warming.

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“…Previous research works have investigated the performance of the IEC in terms of the heat and mass transfer process [6,7]. Liu et al [8] and Dizaji et al [9] presented a numerical model and an analytical model, respectively, for a corrugated dew point evaporative cooler to analyze the influence of varying operation conditions. Duan et al [10] pointed out that the regenerative IEC was able to reduce the annual electrical consumption by up to 58% based on the analysis for selected locations in China.…”

Section: Introductionmentioning

confidence: 99%

On the Study of a Hybrid Indirect Evaporative Pre-Cooling System for Various Climates

Cui

Sun²,

Zhang

et al. 2019

Energies

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A hybrid air-conditioning system has been proposed by integrating an indirect evaporative pre-cooling unit. In the proposed system, the room exhaust air is employed in the indirect evaporative cooler (IEC) to pre-condition the ambient intake air. The mathematical formulation has been judiciously established for the pre-cooling IEC. The validation of the numerical model has been conducted by comparing the simulated results with the experimental data in terms of the outlet temperature and the heat flux along the heat exchanger surface. The pre-cooling performance of the IEC is theoretically investigated for the climate in representative cities selected from five different climate zones. The psychrometric illustration of the air conditioning variation has indicated that the ambient air can be pre-cooled and pre-dehumidified through the IEC. The possibility of water vapor condensation depends on the humidity ratio of the ambient intake air. The simulation result demonstrates the capability of the pre-cooling IEC to fulfill part of the cooling load of the ambient intake air resulting in a marked energy saving potential.

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Two-dimensional numerical study of a heat and mass exchanger for a dew-point evaporative cooler

Cited by 38 publications

References 25 publications

Experimental and numerical investigation of a high-efficiency dew-point evaporative cooler

Experimental and numerical investigation of a high-efficiency dew-point evaporative cooler

A Review of Recent Experimental and Theoretical Research of Dew Point Evaporative Coolers

On the Study of a Hybrid Indirect Evaporative Pre-Cooling System for Various Climates

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