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RE: [EnergyPlus_Support] Re: Solar Array with Boiler for DHW
Hello Elmer,
The WATER HEATER:STRATIFIED object does not exist yet. Sorry about the mistake in the documentation. A similar way to "realize energy savings" can be accomplished by using two WATER HEATER:MIXED objects where one serves as the storage tank coupled to the solar collectors and the other acts as an auxiliary heater to make up the remaining temperature difference if the storage tank water is not hot enough. I think this is probably what you want to do.
To make the WATER HEATER:MIXED function as a storage tank, i.e., do nothing/no heating, simply set the heater capacity to zero.
P
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Elmer Morrissey
Sent: Friday, January 06, 2006 9:03 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Solar Array with Boiler for DHW
I'm going to try and send this again as the 'Rish Text Editor (Beta)
made a mess of my last attempt...
I've been looking at that example...
On page 821 of the input/output reference document it says...
"In order to realize energy savings with a solar heating system, it
is necessary to use the
WATER HEATER:STRATIFIED object for thermal storage."
To which water heater is this referring to?
I'm trying to emulate a system that uses 6 solar collectors that
provide heating for DHW (similar to the example you highlighted).
The water is initially heated in a vessel @40oC. When the solar
collector does not provide enough heat to heat the water, extra
heating is provided from a separate boiler circuit which also
provides for other disparate systems. This water is then fed into
another water heater which heats the DHW to a final temp of 60oC.
Does anyone have any ideas how I might set up a similar system in
E+.
I would like some advice on how good/bad/awful my proposed is...
Approach (This is only possible if I can make the water heaters do
nothing and impose a control whereby the full load is picked up by
the water heater source. Is that possible?)
Solar Collector -> (temp pickup +) Heat Exchanger #1 -> Water
Heater #1 @40oC
Boiler -> splitter {
(split 1)|-> Heat Exchanger #1
(split 2)|-> Water Heater #2 @ 60oC -> DHW
* I would set the Heat Exchanger #1's efficiency to values
that make it similar to the efficiency of the water heater to boiler
circuit setup. This should emulate a twin source for the water
heater.
Does anyone have any thoughts?
Kind regards
-Elmer
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Ellis, Peter"
<peter_ellis@n...> wrote:
>
>
> Hello Elmer,
>
> The example file "SolarCollectorFlatPlateWater.idf" illustrates a
solar hot water system with DHW load, solar collectors, and storage
tank (WATER HEATER:MIXED). You can connect a boiler, or another
auxiliary WATER HEATER:MIXED (perhaps configured as instantaneous
water heater), in series with the storage tank.
>
> P
>
>
> -----Original Message-----
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Elmer
Morrissey
> Sent: Thursday, January 05, 2006 12:31 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Solar Array with Boiler for DHW
>
>
> Hello all,
>
> I am attempting a simulation of the system that provides hot water
for
> a building.
>
> System:
> A solar array and a gas fired boiler combine to provide the DHW
load.
> The solar array provides as much as it can and the rest of the
load is
> picked up by the boiler. Can anyone suggest how I can emulate this
> kind of system or provide a similar example circuit? Is there some
> form of object in E+ which acts as a buffer vessel for HW and can
be
> heated using two disparate loops?
>
> Kind regards
>
> -Elmer
>
>
>
>
>
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