Effect of heat exchanger plates geometry on performance of an indirect evaporative cooling system

Antonellis, Stefano De; Cignatta, Luca; Facchini, Chiara; Liberati, Paolo

doi:10.1016/j.applthermaleng.2020.115200

Cited by 35 publications

(9 citation statements)

References 29 publications

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“…In a few works, the authors perform experimental studies of different variants of the exchanger geometry. Antonellis et al [65] proposed a different IEC geometry and flow distribution. They achieved the wet-bulb effectiveness of around 53%.…”

Section: Discussionmentioning

confidence: 99%

Overview of the M-Cycle Technology for Air Conditioning and Cooling Applications

2022

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The indirect evaporative cooler (IEC) has excellent potential to replace or improve conventional vapor compression equipment in HVAC and refrigeration applications. This could be achieved by using the M-cycle (dew-point evaporative cooling technology). This thermodynamic concept makes it possible to derive a large amount of energy from the air stream (as latent heat released during water evaporation into the working air stream) and use it for another air stream (product). Its application has also spread to other sectors, such as water desalination and distillation, power plants, or NOx reduction. This paper provides an overview of the M-cycle mainly in air conditioning (MAC, D-MAC, H-MAC) and refrigeration (MCT, M-condenser). Various integrated solutions are described, showing improved effectiveness in terms of the wet-bulb temperature and the dew point. The design features of consolidated solutions are better In terms of the flow distribution, geometry, or volume. Most of the improvements confirm the great potential of the M-cycle to increase the unit or the system efficiency due to lower energy and water consumption.

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Section: Discussionmentioning

confidence: 99%

Overview of the M-Cycle Technology for Air Conditioning and Cooling Applications

2022

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“…There are some studies focusing on the pressure drop reduction in indirect evaporative coolers. Antonellis [9] analyzed the performance of different IEC geometry and flow arrangement (counter and parallel water). They examined how different plates' protrusion and pitch affects IEC wet bulb effectiveness and pressure drop.…”

Section: General Presentation Of Technologymentioning

confidence: 99%

“…Different IEC geometry and flow arrangement ε tWB = 53% Antonellis [9] Super-performance hydrophilic material layer ε tWB = 114%, ε tDP = 75% Xu et al [10] Presence of condensation in cross-flow exchanger ε tWB = 64.5% Meng et al [11] Different water spraying configurations ε tWB = 76% Al-zubaydi et al [12] Exchangers made of polystyrene and nylon fiber ε tDP = 78.4% Jia et al [13] Analyzed different materials for DPIEC -Zhao et al [14] Water-absorbing experiment -Duan [15] Analyzed different cooling pads -Xu et al [16], Dogramacı et al [17], Al-Sulaiman [19]…”

Section: Novelty Of Technology Performance Referencementioning

confidence: 99%

Review of Dew Point Evaporative Cooling Technology for Air Conditioning Applications

Pacak

Worek

2021

Applied Sciences

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Indirect evaporative cooling has the potential to significantly improve the natural environment. It follows from a significant reduction in electricity consumption in the hot period, and hence lower operating costs for cooling systems. This paper presents the current state of knowledge and research directions on dew point indirect evaporative cooling. It was found that researchers focus on the development of dew point indirect evaporative coolers (DPIEC) by improving its design, geometry, water distribution, and new porous materials implementation. To evaluate the performance of new types of DPIEC, different methods are used by the scientists. Finally, optimized devices are studied in terms of their performance in different systems, like hybrid and desiccant systems, considering different climate conditions. Potential directions of development of evaporative technologies were indicated, such as increasing the coefficient of performance of solid desiccant evaporative cooling systems, developing novel geometry, and efficient water distribution, including development of porous materials.

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“…In another study, experimental analysis was performed with heat exchangers with different geometries for evaporative coolers. It has been observed that different plate protrusions increase the heat transfer efficiency and lead to a lower pressure drop [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of an air to air heat exchanger used in energy recovery systems

ELMACIOĞLU

ÖZSEVGİN

KOCABIYIK

et al. 2022

Journal of Energy Systems

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With the continuous worldwide energy use increase, energy efficiency is gaining high importance. Consequently, many methods have been investigated for potential energy savings. One of these methods is the use of heat recovery systems. These systems basically re-use waste heat and reduce energy consumption. Also, they are increasingly used to reduce heating and cooling demands of buildings. Their main feature is to provide fresh air to the place which is heated by the exhaust air with the help of a heat exchanger (HEX) working between two different temperature sources. The most commonly used types of heat exchangers in ventilation systems are cross-flow and counter-flow heat exchangers. Cross-flow heat exchangers have a thermal efficiency in the range of 50-75% while counter-flow heat exchangers have 75-95%. Many studies have been carried out to increase the efficiency of this type of heat exchangers. In this study, different designs of crossflow and counter-flow exchangers are compared using ANSYS Fluent software. The aim is to determine how the plate surface geometry affects heat transfer and pressure drop. It is aimed to find the optimum design with maximum efficiency, high heat transfer and low pressure drop for heat exchangers. As a result, it has been observed that thermal efficiency increased from 18% to 60% when changing from cross flow to counter flow in flat plate design, while it increased from 25% to 77% in enhanced plate designs. For enhanced designs, counter flow heat exchanger is 52% more efficient than cross flow heat exchanger. Also, improvements to increase the surface area and turbulence in both flow types have increased heat transfer and thermal efficiency.

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Effect of heat exchanger plates geometry on performance of an indirect evaporative cooling system

Cited by 35 publications

References 29 publications

Overview of the M-Cycle Technology for Air Conditioning and Cooling Applications

Overview of the M-Cycle Technology for Air Conditioning and Cooling Applications

Review of Dew Point Evaporative Cooling Technology for Air Conditioning Applications

Analysis and design of an air to air heat exchanger used in energy recovery systems

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