Effect of relative humidity and temperature control on in-cabin thermal comfort state: Thermodynamic and psychometric analyses

A. Alahmer, M. A. Omar, A. Mayyas, Shan Dongri

    Research output: Contribution to journalArticlepeer-review

    40 Scopus citations

    Abstract

    This manuscript discusses the effect of manipulating the Relative Humidity RH of in-cabin environment on the thermal comfort and human occupants' thermal sensation. The study uses thermodynamic and psychometric analyses, to incorporate the effect of changing RH along with the dry bulb temperature on human comfort. Specifically, the study computes the effect of changing the relative humidity on the amount of heat rejected from the passenger compartment and the effect of relative humidity on occupants comfort zone. A practical system implementation is also discussed in terms of an evaporative cooler design. The results show that changing the RH along with dry bulb temperature inside vehicular cabins can improve the air conditioning efficiency by reducing the heat removed while improving the Human comfort sensations as measured by the Predicted Mean Value PMV and the Predicted Percentage Dissatisfied PPD indices.

    Original languageBritish English
    Pages (from-to)2636-2644
    Number of pages9
    JournalApplied Thermal Engineering
    Volume31
    Issue number14-15
    DOIs
    StatePublished - Oct 2011

    Keywords

    • Evaporative cooler
    • Human comfort
    • PMV
    • PPD
    • Relative humidity
    • Vehicular air conditioning

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