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[EnergyPlus_Support] Re: Generating input for SOLAR COLLECTOR PARAMETERS:FLAT PLATE

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Generating input for SOLAR COLLECTOR PARAMETERS:FLAT PLATE
From: "Elmer Morrissey" <elmofuddly@xxxxxxxxx>
Date: Wed, 11 Jan 2006 17:05:45 -0000
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Hi Peter,

Thank you kindly for the detailed replies. 

Is there a large mismatch in the results when substituting water 
circuits and for glycol circuits? Do you know of any documentation 
that details the difference in performance characteristics?

If I have several solar arrays circuits that are in parallel. And if 
within these circuits, individual solar arrays are connected in 
series, are these all assumed to be ACTIVE within the branch lists?

e.g. is the following correct?

BRANCH,
    Vitosol 100 SW Branch,      !- Branch Name
0,                       
    SOLAR COLLECTOR:FLAT PLATE,  
    Vitosol 100 SW No1/6 Collector,             
	Vitosol 100 SW No1/6 Collector Inlet Node,
	Vitosol 100 SW No1/6 Collector Outlet Node,
    ACTIVE,                  !- Comp1 Branch Control Type
SOLAR COLLECTOR:FLAT PLATE,
	Vitosol 100 SW No2/6 Collector,
	Vitosol 100 SW No1/6 Collector Outlet Node,
	Vitosol 100 SW No2/6 Collector Outlet Node,
	ACTIVE,
SOLAR COLLECTOR:FLAT PLATE,
	Vitosol 100 SW No3/6 Collector,
	Vitosol 100 SW No2/6 Collector Outlet Node,
	Vitosol 100 SW No3/6 Collector Outlet Node,
	ACTIVE,
SOLAR COLLECTOR:FLAT PLATE,
	Vitosol 100 SW No4/6 Collector,
	Vitosol 100 SW No3/6 Collector Outlet Node,
	Vitosol 100 SW No4/6 Collector Outlet Node,
	ACTIVE,
SOLAR COLLECTOR:FLAT PLATE,
	Vitosol 100 SW No5/6 Collector,
	Vitosol 100 SW No4/6 Collector Outlet Node,
	Vitosol 100 SW No5/6 Collector Outlet Node,
	ACTIVE,		
SOLAR COLLECTOR:FLAT PLATE,
	Vitosol 100 SW No6/6 Collector,
	Vitosol 100 SW No5/6 Collector Outlet Node,
	Vitosol 100 SW No6/6 Collector Outlet Node,
	ACTIVE;

Finally, I have a question about the input field for `gross area' in 
SOLAR COLLECTOR PARAMETERS:FLAT PLATE. Should this be the area of 
the panel that contains `useful' interaction with solar levels (i.e. 
collector area)? 

Kind regards

-Elmer




--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Ellis, Peter" 
<peter_ellis@n...> wrote:
>
> 
> Elmer,
> 
> (a) Test Fluid
> The only option for EnergyPlus right now is WATER.  If the 
collector is a solar hot water panel, then most likely is was tested 
using water as the test fluid, unless the manufacturer specified 
otherwise.  We cannot yet model a glycol mixture in the solar loop 
(or any loop in EnergyPlus), so you must assume that is water.  
> 
> 
> (b) Test Volumetric Flow Rate {m3/s}
> This is the flow rate condition under which the performance of the 
collector was tested by the manufacturer.  The efficiency 
coefficients (d)-(f) are calculated for this specific flow rate.  
The flow rate should be indicated somewhere by the manufacturer, 
maybe called "nominal flow rate" or "recommended flow rate"?  If 
not, try to ask the manufacturer. 
> 
> 
> (c) Test Correlation Type
> This indicates whether the collector efficiency curve is 
correlated according to the INLET fluid temperature (Tin), the 
OUTLET fluid temperature (Tout), or the AVERAGE of inlet and outlet 
(Tavg).  So basically you have to figure out if the "dt" in the 
manufacturer's equation is:
> 
> dt = Tin-Tair
> dt = Tout-Tair
> dt = Tavg-Tair
> 
> In the US the INLET correlation is the norm, but this may be 
different in Europe (thus the ability to choose).
> 
> 
> (d)-(f)
> The efficiency equation that you describe from the manufacturer 
can be found in the EnergyPlus EngineeringReference.pdf, and appears 
as follows:   
> 
> n = c0 + c1*(Tin-Tair)/Isolar + c2*(Tin-Tair)^2/Isolar
> 
> The manufacturer's coefficients are therefore related in this way:
> (d) Coefficient 1 of Efficiency Equation (Y-Intercept) 
{dimensionless}
> c0 = n0
> 
> (e) Coefficient 2 of Efficiency Equation (1st Order) {W/m2-K}
> c1 = -k1
> 
> (f) Coefficient 3 of Efficiency Equation (2nd Order) {W/m2-K2}
> c2 = -k2
> 
> 
> (g) Coefficient 2 of Incident Angle Modifier (1st Order)
> (h) Coefficient 3 of Incident Angle Modifier (2nd Order)
> These are usually provided by the manufacturer.  I don't know what 
to tell you if you don't have them.  Try to ask the manufacturer.  
Setting 
> 
> Good luck,
> 
> P
> 
> 
> -----Original Message-----
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx 
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Elmer 
Morrissey
> Sent: Tuesday, January 10, 2006 10:57 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Generating input for SOLAR COLLECTOR 
PARAMETERS:FLAT PLATE
> 
> 
> Hella all,
> 
> I am interested in simulating the performance of solar panels 
> distributed by a German manufacturer (Vitosol). 
> 
> I do have catalog data from the distributer. The catalog 
stipulates 
> that.. 
> ___________________________________________________________________
> 
> "The thermal loss coefficient and optical efficiency combine to 
form 
> the collector efficiency curve which can be calculated on the 
basis 
> of the following formula:
> 
> n = n0 - k1 . (dt/Eg) - k2 . (dt^2/Eg)."
> 
> 
_____________________________________________________________________
> 
> However, E+'s idf requires:
> 
> (a) Test Fluid
> (b) Test Volumetric Flow Rate {m3/s}
> (c) Test Correlation Type
> (d) Coefficient 1 of Efficiency Equation (Y-Intercept) 
> {dimensionless}
> (e) Coefficient 2 of Efficiency Equation (1st Order) {W/m2-K}
> (f) Coefficient 3 of Efficiency Equation (2nd Order) {W/m2-K2}
> (g) Coefficient 2 of Incident Angle Modifier (1st Order)
> (h) Coefficient 3 of Incident Angle Modifier (2nd Order)
> 
> As a result, I am unsure of the values I should instantiate in my 
> input file. I would appear to have direct input for (d) only as 
the 
> solar circuits have a mixture of glycol in order to provide frost 
> protection.
> 
> Does anyone have advice from previous experiences?
> 
> Kind regards
> 
> -Elmer
> 
> 
> 
> 
> 
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References:
- RE: [EnergyPlus_Support] Generating input for SOLAR COLLECTOR PARAMETERS:FLAT PLATE
  - From: Ellis, Peter

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