Page 56 - Green Builder July-August 2020 Issue
P. 56
FIRST FLOOR
Level Average Temperature (°C) Error (%)
GROUND FLOOR Ground Floor 20.06 -4.48%
Office
21.35
1.66%
First Floor
0.30%
21.06
Second Floor 20.68 -1.54%
Average 20.79 -1.01%
In the images below and right, the temperature distribution in
FIRST FLOOR the apartments and oce helps to identify hot spots such as in the
bathroom on the second oor or the TV room on the rst oor. The
layout of the rooms in each apartment, as well as the location of
the inlets/outlets, and radiator greatly impact the heat distribution.
One can observe hot spots around the radiator and colder zones at
the windows with no radiator underneath—i.e., in the bedrooms.
For the ground oor apartment and the oce, the temperature
remains mostly evenly distributed, with locally low temperatures,
expected in the windows’ vicinity
One the rst oor apartment heat map, one can observe that the
TV room is warmer by
- degrees than the rest of the apartment, at
SECOND FLOOR The TV room is the warmest space in the apartment. A more evenly
about .°C, indicating that the radiator delivers too much power.
distributed temperature could be achieved by moving some of the
heat power from the TV room to the bedroom.
GROUND FLOOR
THERMAL COMFORT AND PREDICTED MEAN VOTE (PMV)
As presented above, the PMV results use values taken directly from
the CFD results (surface temperature, velocity, and air temperature)
and inputs from the environment and people (clothing coecient,
metabolic rate, and humidity). In this project, and extracted from the
ASHRAE standard, a winter clothing coecient of
, a “cooking/
cleaning” metabolic rate of
. and a humidity of percent are
chosen as inputs for the calculation of the results.
CFD SIMULATION RESULTS The second oor apartment shows a better distributed temperature
Below, the results of this simulation are explained. than the rst oor; there is, however, a hot spot in the kitchen (left part
of the apartment). This can be correlated with the warmer rst oor
TEMPERATURE DISTRIBUTION TV room where heat is transferred through the slabs to the upper level.
The average temperature for each apartment and office show The simulation of transfer of heat through the concrete slabs helps
acceptable results, with small error to the target temperature of
°C, understand the importance of building materials and their properties.
demonstrating a great correlation between the analytical and the Slabs with high heat resistance would limit this eect and therefore
numerical approach. contribute to keeping the heat within one apartment.
54 GREEN BUILDER July/August 2020 www.greenbuildermedia.com
52-55 GB 0720 IAQ.indd 54 8/12/20 1:27 PM
