IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at

IEA SHC Task 38 Solar Air Conditioning and Refrigeration
Subtask A Report, Date:…
80
70
60
]
[°C
s
re
tu
ra
e
p
m
e
T
50
40
30
20
10
solar supply loop
solar return loop
heat rejection supply loop
heat rejection return loop
cold water supply loop
cold water return loop
ambient temperature
0
4
:0
5
1
6
:1
5
1
8
:2
5
1
0
:4
5
1
2
:5
5
1
4
:0
6
1
6 8
:1 :2
6 6
1 1
Time
0
:4
6
1
2
:5
6
1
4
:0
7
1
6
:1
7
1
8
:2
7
1
5 Summary and Conclusions
Within the IEA SHC task 38 for the solar adsorption cooling plant of the Viennese
Municipality Department 34 (MA34) following investigations were accomplished:
• COP el and COP th of the solar adsorption cooling plant
• Operation of hybrid heat rejection in dry or wet cooling mode
• Effects of variable speed control of the heat rejection fans on the energy performance
Summary of the substantial realizations:
• The heat rejection in this plant causes three quarters of the electricity demand,
therefore the selection of a heat rejection device with a high efficiency class
(preferably wet cooling tower or at least hybrid heat rejection) is essential to achieve
a high COP el .
• Selection of variable speed, energy-efficient pumps are also important to achieve high
COP el .
• The monitoring results of the 25 th of August 2010 showed that a COP el of 4,55 is
already possible with this plant. Therefore, high desorption temperatures are