In plant loops, temperature-based controls
can be modeled using ComponentSetpoint plant equipment operation. With this
you could model as a boiler in series with a temperature setpoint on its
outlet.
You also might be able to simplify the
problem by using the heater inside the storage tank as a way to model the separate
back up heater.
From:
Sent: Thursday, October 15, 2009
11:33 AM
To:
Subject: [EnergyPlus_Support]
Water heater - solar collector and instantaneous water heater
Hi,
I have some issues in a water heater model.
My project consists in a storage tank that is heated both by a solar collector
and a instantaneous water heater (that complements the solar collector when it
is necessary).
I have two sources to heat the storage tank, but the object 'Water
heater: mixed' only allows one inlet and outlet source side.
I can try to create one loop that contains: the solar collector, the
pump, the instantaneous water heater and then the storage tank, so I have just
one source in the storage tank. The problem is that I have to have the
possibility to bypass the instantaneous water heater when it is not necessary.
In the 'branch' object I have the option to bypass, but it is controlled only
by flow rate, and not by temperature.
How can I do that?
Thanks,
Leticia Neves
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