Civil Engineering Reference
In-Depth Information
Fig. 9 Energy consumption
of the heat pumps in cooling
mode for 5 days in August
2008: a Reference, PU, and
RT27+PU. b Alveolar and
SP25+Alveolar cubicles
(Castellón et al.
2009
)
Table 3
Accumulated energy consumption and energy savings for the different cubicles
Energy consumption
(Wh)
a
Energy savings
(Wh)
b
Energy savings
(%)
b
Improvement
(%)
c
Reference
9,376
0
0
-
PU
4,583
4,793
51.1
0
RT27+PU
3,907
5,469
58.3
14.8
Alveolar
5,053
4,323
46.1
0
SP25+Alveolar
4,188
5,188
55.3
17.1
a
Notes
Set point of 24 C for 5 days
b
Refer to the reference cubicle
c
Refer to the cubicle with analogue constructive solution and w/o PCM
The PCM module geometry adopted in this study was to use several cylinders at
the top of the water tank. A granular PCM-graphite compound of about 90 vol.%
of sodium acetate trihydrate and 10 vol.% graphite was chosen as the PCM for the
experiments presented here. The experiments presented in this paper showed that
the inclusion of a PCM module in water tanks for domestic hot-water supply is a
very promising technology. It would allow having hot-water for longer periods of
time even without exterior energy supply, or to use smaller tanks for the same
purpose.
