INSTALLATION - SOLAR COLLECTORS
Rinnai 13
DD FP Solar Pre Heat System OIM
SYSTEM ORIENTATION AND INCLINATION
The performance of any solar hot water system is determined by the way that the system is installed.
For Australian installations, solar collectors should face the equator (True North) for optimum performance.
Installing solar collectors facing up to 45 degrees from North (between North-East and North-West will reduce
efficiency by approximately 5%.
For Australian installations, the inclination of the solar collectors should be the same as the latitude of the site
for optimum performance. Inclinations within 20 degrees of the latitude of the site will reduce efficiency by
approximately 5%. Many roofs in Australia have a slope between 20° and 25° and provide an appropriately angled
mounting surface.
Installers must ensure they comply with relevant local regulations in regards to inclination and orientation.
City
Latitude
City
Latitude
City
Latitude
Adelaide
35
°S
Canberra
35
°S
Melbourne
38
°S
Albany
35
°S
Darwin
12
°S
Perth
32
°S
Alice Springs
24
°S
Dubbo
32
°S
Port Hedland
20
°S
Brisbane
27
°S
Geraldton
28
°S
Rockhampton
24
°S
Broken Hill
31
°S
Hobart
42
°S
Sydney
34
°S
Cairns
17
°S
Mildura
34
°S
Townsville
19
°S
Latitudes of Australian Cities
PIPE AND PUMP SIZING
NOTE
Ensure that the combined length of the flow and return piping for each collector set is approximately
the same. This will result in even flow to all collectors and optimise performance.
Total Collectors in array
Up to
10
20
30
40
50
60
70
80
90
100
Piping sizing for solar
flow and return manifolds
DN20
DN20
DN25
DN32
DN32
DN32
DN40
DN40
DN40
DN50
Pump
20-
60N
20-
60N
20-
60N
25-
80N
25-
80N
25-
80N
25-
80N
25-
80N
25-
80N
25-
80N
Maximum pipe run in collector circuit (m)
Pump Speed
1
30
-
-
-
-
-
-
-
-
-
2
60
40
20
-
-
-
-
-
-
-
3
100
100
100
100
100
100
100
100
100
100
