Abstract:
In a society in continuous development, the requirements
for thermal comfort and indoor air quality are increasing.
However, these should be achieved by rational energy
consumption. With this in mind, the combined use of
displacement ventilation (DV) and radiant cooling floor (RCF)
is an innovative concept that has become popular as a cooling
system in high-rise public enclosures.
To provide a high thermal comfort, the effects of buoyancy,
supplied air temperature, air discharge angle and surface floor
temperature should be treated with special care.
Therefore, this paper presents a sensitivity analysis
considering these critical parameters in different numerical
simulations. The results of the simulations are used to calculate
the thermal comfort index, according to ISO 7730 standard, in
high ceiling enclosures using a DV + RCF system. The general
thermal sensation has been predicted using the PMV (Predicted
Mean Vote) and PPD (Predicted Percentage of Dissatisfied)
indices. The local thermal discomfort has been evaluated by
radiant temperature asymmetry, draught, vertical air
temperature differences and floor surface temperatures.
According to these indices, the classification of Category A is
reached using DV + RCF system, exception of the radiant
temperature asymmetry index. That fact will be discussed in
detail, analyzed the suitability of the calculation indicates in
ISO 7730 for systems involved in radiating surfaces.
Description:
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.
