http://www.sunflower-solar.com/
Version
11.03
20
Subjec
t to c
hange 2011 SUNF
LOWER SOLAR
pressure control devices must be installed. T he solar loop should be designed to operate at no more than
800kPa (PRV may be 850kPa). (800kPa =8bar=116psi) For installation where main pressure water is used,
the system should ideally be designed to operate at a pressure of <500kPa, achieved by use of a pressure
limiting/reduction value.
11.
Pressure Drop
△
p=0.2Kpa
12.
Installation Angle
It is common for solar water heaters to be installed at an angle that is similar to the latitude of your location. Installing
it with a tilt angle
(as measured from horizontal) less than 20° is not recommended as the heat pipes perform best in
the range of 20-70 degrees. While adhering to this guideline, an angle of your la/-10° is acceptable, and will
not greatly reduce the solar heater output.
Angles out of this range can also be used, but a decrease of heat output will result. When the
angle is lower than the
latitude, it will increase summer output, while a higher angle will enhance winter output.
13.
Wind and snow accumulation
When installing the solar water heater, please consider the issue of wind resistance and the resultant stress on the
attachment points. The standard frame is designed to withstand wind speeds of up to
100km/h (62 mph) and 30cm
(about 11.8 inches) of snow accumulation without damage. For areas with the possibility for high winds, additional
reinforcement of attachment points
(e.g. into roof rafters, or ground anchors)
may be required and can easily be
supplied by your local installers.
14.
Maintenance Requirements
14.1 Cleaning
Regularly raining could keep the heat pipe vacuum tubes clean, but if it is particularly dirty then it may need to be
cleaned with a soft cloth and warm, soapy water or other glass cleaning solutions. If the tubes are not easily and
safely accessible, a water spray from a garden hose may also be used.
14.2 Leaves
During autumn, leaves may accumulate between or under the tubes. Please remove these leaves regularly to
ensure optimal performance and to prevent any fire hazard. (The solar water heater will not cause the ignition of
