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Simulated House using HTB2
The first room simulated was GR1H1 Figure 8.4 shows the scheme used by HTB2 to simulate the first room, it illustrates the space of the room with four walls, the ground floor and the roof. The windows and the adjacent space are also shown and the connections to the external conditions. The results of simulation are presented in Figure 8.5, which shows that:
· There is about +/- 5°-7°C between predicted indoor air temperature and the outdoor air temperature;
· for air temperature, the values obtained from HTB2 predictions during the day are within 1°-2°C of the measured values, at night the predicted air temperature is also within 1°- 2°C of the measured air temperature;
· for surface temperature, the predicted values are within 1°-2°C of the measured values, both day and night;
· there is about a four hour thermal lag between the outdoor air temperature and the measured inside air temperature which is due to the time needed for the space to heat up or cool down due to the thermal mass effect;
· this is also the case with HTB2 air temperature but there is a slight lag to the measured data of between a half hour and one hour. This is partly the result of the fact that HTB2 measurements are exactly at the hour while the field measurements were twenty minutes after the hour and each half an hour.
Figure 8.4: The scheme used to define GR1(H1) in HTB2, a key plan for room location
Figure 8.5: HTB2 and measured data for GR1H1, the two lines showing the thermal lag between measured and simulated data.