|
Open
Loop
Solar Water Heating Systems
Extra Parallel
Tanks
Open Loop
Systems are suitable for single application
domestic hot water (DHW) systems, in mild and moderate climates. One
or more tanks can be used in various
configurations and they retrofit easily into
existing systems.
In some situations, particularly integrating with an existing system, a
two tank system is necessary. The traditional arrangement is to have a
solar preheat tank, in which the tanks are plumbed in series. If the
tanks can be sited close together connecting tanks in parallel has some
advantages. Both these arrangements provide adequate backup. |
|
Top Feed Tanks in
Parallel
Bottom Feed Tanks in
Parallel
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| Connection
an Extra Tank in Parallel |
Connecting
an additional tank in parallel to the existing one is an ideal solution
for some installations. The two top elements are connected to provide a
6000kW backup capability on about 30 gallons, similar to a custom built
solar tank, but for less than half the cost. Both bottom elements can be
turned off. In the bottom feed tanks the solar heat will thermosyphon
between the tanks. |
| Advantages
of an Extra Tank in Parallel |
- The existing tank is also used to store
the solar energy so the extra tank can be smaller.
- Minimum disturbance to the existing
tank.
- When possible solar energy takes care of
the standby losses.
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| Disadvantages
of an Extra Tank in Parallel |
- The tanks must be sited close together.
- Takeoffs to the valve or hot water must
be central so that each tank is drawn from equally.
- Stand-by heat losses are more than twice
those of a single tank system.
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E-Mail:
Thermo Technologies
Thermal Solar Collectors | Solar Controller
| Solar Tanks
| Home
9009 Mendenhall Court
Suite E
Columbia, Maryland 21045
Voice: (410) 997-0778 Fax:
(410) 997-0779 |
