Abstract
In this work, the use of numerical simulation in the application of solar radiant systems, internal airflow and occupants’ presence in the improvement of comfort in winter conditions is made. The thermal comfort, the local thermal discomfort and the air quality in an occupied chamber space are evaluated. In the experimental measurements, a wood chamber, a desk, two seats, two seated hygro-thermal manikins, a warm radiant floor, a solar radiation simulator and a water solar collector are used. The air velocity and the air temperature fluctuation are experimentally evaluated around 15 human body sections. The chamber surface temperature is experimentally measured. In the numerical simulation, a coupling human thermal comfort (HTC) integral model, a computational fluids dynamics (CFD) differential model and a building thermal response (BTR) integral model are applied. The human thermal comfort level is evaluated by the HTC numerical model. The airflow inside the virtual chamber, using the k-epsilon and RNG turbulence models, is evaluated by the CFD numerical model. The chamber surface and the collector temperatures are evaluated by the BTR numerical model. In the human thermal comfort level, in non-uniform environments, the predicted mean vote (PMV) and the predicted percentage of dissatisfied (PPD) people are numerically evaluated; in the local thermal discomfort level the draught risk (DR) is experimentally and numerically analyzed; and in the air quality, the carbon dioxide CO2 concentration is numerically calculated. In the validation tests, the experimental and numerical values of the chamber surface temperature, the air temperature, the air velocity, the air turbulence intensity and the DR are presented.
Highlights
Thermal comfort, local thermal discomfort and air quality in a chamber equipped with forced ventilation, promoted by an air forced system, and a warm floor, promoted by a solar water collector system, are evaluated in the study presented in this work
The idea of the study presented in this work is to develop and apply numerical software, based on coupling two integral and one differential models, in order to study systems combined by forced ventilation and a warm radiant floor
The combination of numerical test and experimental test, done in this work, are made in a steady-state regimen and in non-isothermal conditions. These tests are used to evaluate the comfort level, in a chamber equipped with forced ventilation, with a warm radiant floor and occupied by two seated occupants
Summary
Thermal comfort, local thermal discomfort and air quality in a chamber equipped with forced ventilation, promoted by an air forced system, and a warm floor, promoted by a solar water collector system, are evaluated in the study presented in this work. The HTC numerical model approach is used to evaluate the mean radiant temperature (MRT), the thermal comfort level, the skin temperature, the clothes temperature and the transpiration field, in non-uniform environments. The air velocity and the air temperature fluctuation around the 15 human body sections (used to evaluate the local thermal discomfort level and to validate the numerical values) and the surrounding chamber surface temperature are measured
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