An experimental study of the air humidification process using a membrane contactor

Englart, Sebastian

doi:10.1051/e3sconf/20171700021

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Membranes can be used in Heating, Ventilating and Air-Conditioning system to conduct air treatment processes, for example: humidiﬁcation, liquid desiccant dehumidiﬁcation, vacuum dehumidiﬁcation, EC. 8–14 The advantages of using porous synthetic membranes in the air treatment process include, for example, lack of direct contact between liquid and air, elimination of liquid droplets in the air stream, prevention of both the transmission of microorganisms, bacteria or spores between phases and the contamination of the liquid with airborne dust. 15,16 These advantages are not achievable with some traditional air treatment techniques.…”

Section: Introductionmentioning

confidence: 99%

Use of a membrane module for semi-direct air evaporative cooling

Englart

2019

Indoor and Built Environment

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This study discusses the use of a membrane module for semi-direct evaporative air cooling. A cross-flow membrane module was used to carry out this air treatment process. For such a flow, it was proposed to describe and solve the heat and mass transfer model as a one-dimensional problem. The mathematical model was used to determine the moisture content and air temperature at the outlet from the module and the temperature of the circulating water. Results obtained using the proposed model are in good agreement with the experimental data. The relative error for the air temperature at the module outlet did not exceed 0.5%. For the moisture content, the relative error did not exceed 4%. For the circulating water temperature, the relative error did not exceed 0.6%. This paper also discusses the heating efficiency of the evaporative cooling process. Methods for determining the unit cooling indicator and the energy efficiency ratio are also proposed.

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Section: Introductionmentioning

confidence: 99%

Use of a membrane module for semi-direct air evaporative cooling

Englart

2019

Indoor and Built Environment

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“…They can also be used in HVAC (heating, ventilation and air conditioning) systems to conduct air treatment processes for example drying, humidifying or evaporative cooling [1][2][3]. The benefits of using membranes in the air treatment process include, for example, lack of direct contact between liquid and air, elimination of liquid droplets in the air stream, prevention of microorganisms, bacteria or spores between phases and prevention of liquid contamination by airborne dust [4,5].…”

Section: Introductionmentioning

confidence: 99%

Comparison heat and mass transfer coefficients in the shell side of the hollow fiber membrane module

Englart

2018

E3S Web Conf.

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Abstract. The article discusses the theory associated with the determination of total heat and mass transfer coefficients in a membrane module. The equations for determining Nusselt and Sherwood numbers on the shell side of the module are presented. The design of the membrane module and the test bench are also discussed. The convective coefficients of heat and mass transfer on the shell side have been determined on the basis of the measurements. Calculation results obtained from correlation equations were then compared with the results of experimental investigations of convective heat and mass transfer coefficients in the airwater system. The equation is indicated appropriate for use in the case analysed.

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One-Dimensional Transient Model of Food Product Temperature and Weight Loss Evolution in a Vacuum Cooler With Membrane Humidification

Paña,

Berana

2024

Inter J Ener Clean Env

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A one-dimensional, transient model was developed to predict the temperature and weight loss evolution of a food product cooled using a vacuum cooling system with membrane humidification. The model included the following: (1) a sub-model based on the mass conservation of air and vapor inside the vacuum chamber; (2) a sub-model based on the coupled mass and heat transfer with inner vapor and heat generation; and (3) a sub-model based on the mass conservation of water vapor along the flow channels inside the humidifier. The vacuum chamber pressure was reduced from 1 atm to 2200 Pa using a vacuum pump with deflating speed of 500 m3/hr and condenser and membrane humidifier operating temperatures of 13°C and 60°C, respectively. A meat joint with a weight of 5.30 kg was cooled from an initial core temperature of 74°C to below 10°C. The conventional and modified models both cooled the food product to 10°C in 25 minutes. It was found out that increasing the chamber relative humidity reduced the surface water evaporation while the internal evaporation rate remained the same. Thus, the meat's moisture content, which was initially at 73.51%, was reduced to only 65.44%-an improvement from the conventional vacuum cooling system's 64.31%. This translated to product weight loss of only 10.98%, which represented significant progress compared to the conventional system's 12.51%. The simulation results indicated that employing humidification in a vacuum cooling system reduces the product total moisture loss while maintaining the rapid cooling rate.

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An experimental study of the air humidification process using a membrane contactor

Cited by 3 publications

References 11 publications

Use of a membrane module for semi-direct air evaporative cooling

Use of a membrane module for semi-direct air evaporative cooling

Comparison heat and mass transfer coefficients in the shell side of the hollow fiber membrane module

One-Dimensional Transient Model of Food Product Temperature and Weight Loss Evolution in a Vacuum Cooler With Membrane Humidification

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