7
SOLAR SYSTEMS
manual and maintenance
How Your Solar System Works
The Joule solar system installed is designed to heat your hot water cylinder using energy
from daylight and air temperature. The solar system works by taking the heated fluid in
the solar collector and pumping it through the pipe work into the coil in your hot water
cylinder. This hot fluid transfers its heat into your stored water in your hot water cylinder.
For this to work the temperature of the fluid in your solar collector must be warmer than
the temperature of the water in your cylinder that surrounds the coil used by the solar. This
coil is normally located at the bottom of you cylinder as this is the pre-heat part of your hot
water cylinder. (See notes on how solar heats the hot water cylinder)
Phase 2
When hot water is used, hot water level rises and is replaced by
cold water.
The level of hot water rises in the cylinder thus reducing the amount
of hot water in the cylinder. The cold water enters the cylinder from
the base replenishing the used hot water.
Phase 3
When there is a solar gain it heats cold water at the bottom of the
cylinder, thus reducing the load on the boiler.
Solar gain enters the cylinder through the bottom coil. This pre-
heats the cold water before it rises up to the boiler coil. The greater
the level of solar gain, the more the cold water is preheated, the
less the boiler must heat.
Phase 1
When boiler operates and there is no solar gain.
Boiler heats up top half of cylinder from the point the boiler coil
starts in the middle of cylinder. Because hot water rises only, when
the boiler is operating and no solar gain is present only the top half
of the cylinder can be heated.
Joule Navitas On-roof
Joule Acapella
Joule Navitas In-roof
Joule VisSolis In-roof
