[EnergyPlus_Support] Re: Solar Array with Boiler for DHW

["Elmer Morrissey" <elmofuddly@xxxxxxxxx>]

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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