Environmental Engineering Reference
In-Depth Information
Figure 4.17
Operating hours of floor cooling system in 2006
shades and any natural night ventilation rates through tilted windows. If no exter-
nal shading were used, the room temperatures would be overestimated by about
5 K. Introducing a low night air exchange of 0.6 per hour reduced the temperature
difference by about 1 K. A very good agreement between measured and simulated
room temperatures was obtained when the room was shaded on average by 70%
during the day and night ventilation was at 0
.
6h
−
1
(see Figure 4.20). During occu-
pation of the seminar room, the air temperature could be kept at comfortable levels
below 26
◦
C.
40.0
10
Air before HX
Air after HX
Room
air
35.0
30.0
25.0
5
20.0
15.0
Brine outlet from earth HX
Brine inlet to earth HX
10.0
0
16
18
20
22
24
Date in June
26
28
30
Figure 4.18
Temperature levels of brine solution and air before and after the brine to air heat exchanger.
The status of the ventilation system is also shown
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