Numerical study of a novel counter-flow heat and mass exchanger for dew point evaporative cooling

Zhao, Xudong; Li, J.M.; Riffat, Saffa

doi:10.1016/j.applthermaleng.2007.12.006

Cited by 200 publications

(80 citation statements)

References 2 publications

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“…The temperature of the treated surface equals to the local wall temperature. 5) The thermal resistance of the wall separating the adjacent dry and wet channels is assumed to be negligible, namely ignore the temperature difference between the dry and wet sides of the wall (Zhao et al, 2008). 6) Air is treated as incompressible gas.…”

Section: Fig2 Physical Model Of the Corrugated Hmx For Computationmentioning

confidence: 99%

A study on the effect of ground surface boundary conditions in modelling shallow ground heat exchangers

Bortoloni¹,

Bottarelli²,

2017

Applied Thermal Engineering

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Section: Fig2 Physical Model Of the Corrugated Hmx For Computationmentioning

confidence: 99%

A study on the effect of ground surface boundary conditions in modelling shallow ground heat exchangers

Bortoloni¹,

Bottarelli²,

2017

Applied Thermal Engineering

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“…As a result of evaporation, the air in the wet channel absorbs heat from the product air flowing in the adjacent side. This process occurs multiple times in a short physical space within the exchanger, thus, resulting in progressively colder product air temperatures [107]. 19 Fig.…”

Section: Indirect Evaporative Coolersmentioning

confidence: 99%

“…19 Fig. 10 (a, b) schematics of DPEC and (c) psychometric process [97,107] The arrangement enables the temperatures of the product air to be cooled nearly to the dew-point temperature of the incoming working air, which is considerable lower than the wet bulb temperature (the achievable limit for direct evaporative cooling) [108].…”

Section: Indirect Evaporative Coolersmentioning

confidence: 99%

Solar pond powered liquid desiccant evaporative cooling

Elsarrag

Igobo

Alhorr

et al. 2016

Renewable and Sustainable Energy Reviews

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Liquid desiccant cooling systems (LDCS) are energy efficient means of providing cooling, especially when powered by low-grade thermal sources. In this paper, the underlying principles of operation of desiccant cooling systems are examined, and the main components (dehumidifier, evaporative cooler and regenerator) of the LDCS are reviewed. The evaporative cooler can take the form of direct, indirect or semi-indirect. Relative to the direct type, the indirect type is generally less effective. Nonetheless, a certain variant of the indirect type -namely dew-point evaporative cooler -is found to be the most effective amongst all. The dehumidifier and the regenerator can be of the same type of equipment: packed tower and falling film are popular choices, especially when fitted with an internal heat exchanger. The energy requirement of the regenerator can be supplied from solar thermal collectors, of which a solar pond is an interesting option especially when a large scale or storage capability is desired.

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“…The performance of a 400 m 3 /h air flow rate cooler was analysed and showed that for inlet air temperatures higher than 24 C the model results accuracy were within 10%. Zhao et al [6] presented a numerical study of a counter flow Indirect Evaporative Cooler for sub-wet bulb temperature cooling. The authors suggested a range of design conditions to maximize the cooler performance including air velocity range, height of air passage, and length to height ratio of air flow ducts and found that the cooler can yield wet bulb effectiveness of up to 1.3.…”

Section: B Indirect Evaporative Cooling and Sub Wet Bulb Temperaturementioning

confidence: 99%

Investigation of an Evaporative Cooler for Buildings in Hot and Dry Climates

Boukhanouf¹,

Ibrahim²,

Alharbi³

et al. 2014

JOCET

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Abstract-The paper presents a computer model and experimental results of a sub-wet bulb temperature evaporative cooling system for space cooling in buildings in hot and dry climates. The cooler uses porous ceramic materials as the wet media for water evaporation. Under selected test conditions of airflow dry bulb temperature of up to 45 o C and relative humidity of up to 50%, it was found that the supply air could be cooled to below the wet bulb temperature with a maximum cooling capacity of 280 W/m 2 of the wet ceramic surface area. It was also shown that the overall wet bulb effectiveness is greater than unity. This performance would make the system a potential alternative to conventional mechanical air conditioning systems in hot and dry regions.

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Numerical study of a novel counter-flow heat and mass exchanger for dew point evaporative cooling

Cited by 200 publications

References 2 publications

A study on the effect of ground surface boundary conditions in modelling shallow ground heat exchangers

A study on the effect of ground surface boundary conditions in modelling shallow ground heat exchangers

Solar pond powered liquid desiccant evaporative cooling

Investigation of an Evaporative Cooler for Buildings in Hot and Dry Climates

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