Experimental and numerical study of dew-point indirect evaporative coolers to optimize performance and design

Comino, Francisco; Romero-Lara, María Jesús; Adana, Manuel Ruiz de

doi:10.1016/j.ijrefrig.2022.06.006

Cited by 15 publications

(3 citation statements)

References 24 publications

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“…Comino et al [81] developed a detailed numerical model for the performance prediction of DIEC systems. This model, based on the ε-NTU method applied to 100 sub-heat exchangers, was modified to also take into account the wet surface fraction of the secondary air channels.…”

Section: Numerical Modelsmentioning

confidence: 99%

Modeling of Indirect Evaporative Cooling Systems: A Review

Caruana,

De Antonellis,

Marocco

et al. 2023

Fluids

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Air-to-air indirect evaporative cooling (IEC) systems are particular heat exchangers that use the latent heat of evaporation of water to cool down an air stream, without increasing its specific humidity, thus guaranteeing adequate thermohygrometric conditions in the refrigerated environment with low energy consumption. Dew-point indirect evaporative cooling (DIEC) systems are based on the IEC technology, but they recirculate a part of the air taken from the room to be refrigerated, in order to possibly achieve a lower air temperature. IEC and DIEC systems are becoming increasingly common these years, as they can ensure a good efficiency, minimizing the environmental impact of the air-conditioning system. Consequently, it has been necessary to develop models, both analytical and numerical, to quickly and accurately design this type of system and to predict their performance. This paper presents a review of the analytical and numerical models developed specifically for IEC and DIEC systems, highlighting their method, main innovations and advantages, and possible limitations. From this analysis, it emerged that analytical models have been developed since the late 1990s and only few of them are suitable for DIEC heat exchangers, while numerical models for both IEC and DIEC systems are gaining popularity in recent years. Almost all the analyzed models have been validated by comparison with numerical and/or experimental data, showing a maximum discrepancy within 10% in the majority of the cases. However, the validations were performed for a few specific cases, so in real applications it might be difficult to associate the model boundary conditions and the heat exchangers operating conditions, such as nozzles orientations, plates materials, water flow rates, and configurations. Another common limitation concerns the modeling of some properties, as wettability factor and air density, which might affect the accuracy of the results.

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Section: Numerical Modelsmentioning

confidence: 99%

Modeling of Indirect Evaporative Cooling Systems: A Review

Caruana,

De Antonellis,

Marocco

et al. 2023

Fluids

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“…The key parameters and performance were analyzed by considering real working conditions caused by air passing through perforations. Comino et al [18] optimized the performance of DPEC for different applications using a NTU model. The optimized COP values were 50.26, 44.19, and 37.14 for office, restaurant, and auditorium, with corresponding working-supply air ratios of 0.45, 0.45-0.8 and 0.45-0.8, respectively.…”

Section: Introductionmentioning

confidence: 99%

The Enhanced Dew-Point Evaporative Cooling with a Macro-Roughened Structure

Wang

et al. 2023

Preprint

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“…The experimental and model results showed good agreement. F. Comino et al (Comino et al, 2022) developed a model based on the ε-NTU technique for the operation of an IEC unit subjected to conditions aligned with European ventilation rules. The low airflow rates achieved peak COPs of 50.26, 44.19, and 37.14 for an office, restaurant, and auditorium respectively.…”

Section: Introductionmentioning

confidence: 99%

Study of the experimental performance of dew point evaporative cooling arrangement for modified fluid flow passages

Patunkar

Dingare

2022

Front. Mech. Eng.

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The satisfactory performance of indirect evaporative cooling techniques (IEC) is governed significantly by the structural and design arrangement of heat and mass exchange devices. The experimental performance of the dew point evaporative cooler has been investigated in the present work with the geometrically modified flow passages for air and water. Conventionally, these passages are formed by either flat or corrugated plates. The trapezoidal corrugated plate has been used to form these passages for air and water. The laboratory trials were conducted for the different combinations of intake air temperature, specific humidity, and air velocity. The performance in terms of dew point and wet bulb efficiency is presented based on laboratory trials. The experimental results achieved dew point and wet bulb efficiencies ranging between 52% and 82% and 74% and 126%, respectively. The geometrically modified flow passages increase the heat exchange area for the same volume of a similar heat exchange device and achieve an increased thermal performance of the proposed cooler.

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Experimental and numerical study of dew-point indirect evaporative coolers to optimize performance and design

Cited by 15 publications

References 24 publications

Modeling of Indirect Evaporative Cooling Systems: A Review

Modeling of Indirect Evaporative Cooling Systems: A Review

The Enhanced Dew-Point Evaporative Cooling with a Macro-Roughened Structure

Study of the experimental performance of dew point evaporative cooling arrangement for modified fluid flow passages

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