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Integrated dehumidification and downdraft evaporative cooling system for a hot-humid climate

Conference Paper


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Abstract


  • Unlike in hot-dry climates, in hot-humid climates evaporative cooling techniques are not readily suitable

    for space cooling. In order to effectively use evaporative cooling in hot-humid climates,

    dehumidification of ambient air is necessary before it passes over an evaporative medium for cooling.

    The present study explores the combined process of dehumidification and evaporation and its effect on

    thermal comfort in a typical small residential building located in a hot humid climate. A novel system

    has been investigated with the combination of an Earth Tube Ventilation (ETV) (for pre-cooling of air),

    a rotary wheel desiccant dehumidifier (for dehumidification) along with a Passive Downdraught

    Evaporative Cooling (PDEC) tower (for evaporation) in that order.Parametric simulations using the

    EnergyPlus tool have been conducted in order to determine the critical dimensions and parameters of

    the proposed system, such as desiccant system sizing, PDEC tower height, and air and water flow rate at

    various points of the system. Results of indoor air temperature, humidity levels and volumetric air flow

    rates in the building spaces were obtained to study the influence of the proposed combined system on

    human thermal comfort. On a typical hot day the results from the proposed system show a relatively

    constant indoor air temperature of 28 °C (as opposed to peak indoor temperature of 36 °C occurred by

    means of natural ventilation) and indoor relative humidity in the range of 62 % - 68 %. The volumetric

    airflow rate from the outlet of the PDEC tower is in the range of 2.97 - 3.41 m3/s which is well within

    recommended levels for a dwelling unit. The proposed system displays a significant potential for

    providing space cooling in hot-humid climates as it paves an alternate way to the conventional energy

    consuming vapour compression Air Conditioning units.

Publication Date


  • 2014

Citation


  • Gokarakonda, S. & Kokogiannakis, G. (2014). Integrated dehumidification and downdraft evaporative cooling system for a hot-humid climate. 30th International PLEA Conference (PLEA 2014) (pp. 1-8). Ahmedabad, India: CEPT University Press.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4664&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3645

Start Page


  • 1

End Page


  • 8

Abstract


  • Unlike in hot-dry climates, in hot-humid climates evaporative cooling techniques are not readily suitable

    for space cooling. In order to effectively use evaporative cooling in hot-humid climates,

    dehumidification of ambient air is necessary before it passes over an evaporative medium for cooling.

    The present study explores the combined process of dehumidification and evaporation and its effect on

    thermal comfort in a typical small residential building located in a hot humid climate. A novel system

    has been investigated with the combination of an Earth Tube Ventilation (ETV) (for pre-cooling of air),

    a rotary wheel desiccant dehumidifier (for dehumidification) along with a Passive Downdraught

    Evaporative Cooling (PDEC) tower (for evaporation) in that order.Parametric simulations using the

    EnergyPlus tool have been conducted in order to determine the critical dimensions and parameters of

    the proposed system, such as desiccant system sizing, PDEC tower height, and air and water flow rate at

    various points of the system. Results of indoor air temperature, humidity levels and volumetric air flow

    rates in the building spaces were obtained to study the influence of the proposed combined system on

    human thermal comfort. On a typical hot day the results from the proposed system show a relatively

    constant indoor air temperature of 28 °C (as opposed to peak indoor temperature of 36 °C occurred by

    means of natural ventilation) and indoor relative humidity in the range of 62 % - 68 %. The volumetric

    airflow rate from the outlet of the PDEC tower is in the range of 2.97 - 3.41 m3/s which is well within

    recommended levels for a dwelling unit. The proposed system displays a significant potential for

    providing space cooling in hot-humid climates as it paves an alternate way to the conventional energy

    consuming vapour compression Air Conditioning units.

Publication Date


  • 2014

Citation


  • Gokarakonda, S. & Kokogiannakis, G. (2014). Integrated dehumidification and downdraft evaporative cooling system for a hot-humid climate. 30th International PLEA Conference (PLEA 2014) (pp. 1-8). Ahmedabad, India: CEPT University Press.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4664&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3645

Start Page


  • 1

End Page


  • 8