[TRNSYS-users] (PLEASE)optimization of a solar heating system combined with dual-source heatpump

[Jeff Thornton]

<I want to find the best configuration of the system (include the area
of the collectors, the angle of azimuth&dip of the collector, the
constant flowrate of the collectors, the volume of the storage tank )
.when i simulated it in trnsys and genopt using PSO ,i tried to set the
object function as the sum of energy consumption in a year or the life
circle cost of the system ,it turned out that the optimised area of
collector is awalys to be the low limit of the collectors range i set in
the genopt, may be it is the truth,i am confused.> 

Set the tank volume to something reasonable with typical flow rates. Set
the collector slope to the latitude and the azimuth facing the equator.
Run a simple parametric study and look at the life cycle cost of the
system as a function of the collector area. It is VERY possible that the
system will show increasing life cycle cost with increasing collector
area - especially in a climate without a great solar resource. 

<Has anyone has the experience of optimization in similar system?how to
confirm the best area of collector of the system?> 

We do optimizations on systems like this all the time but we don't ever
start with a 5 variable optimization. We'll use the Hooke-Jeeves
algorithm on the tank volume and array area to get us in the right
ballpark (with slope = latitude and south facing collectors at standard
flow rates). Once you are in the ballpark then you can expand to more
variables and have some hope of finding a solution with that many
variables. 

Jeff 

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton at tess-inc.com

On 04/13/2016 9:31 am, Dr Yi Zhang wrote: 

> I am not sure if the PSO in GenOpt is a multi-objective algorithm... if not, you need to set the weighting between the two objectives "right" in order to get the desired result. Try jEPlus+EA for a multi-objective approach, which will show you the trade-off between performance and cost: http://www.jeplus.org/wiki/doku.php?id=docs:jeplus_ea:features 
> 
> Seeing the trade-off will help you answer your second question, too. 
> 
> Regards, 
> 
> Yi 
> 
> FROM: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] ON BEHALF OF Free
> SENT: 13 April 2016 14:47
> TO: trnsys-users
> SUBJECT: [TRNSYS-users] (PLEASE)optimization of a solar heating system combined with dual-source heatpump 
> 
> Dear all 
> 
> I am now doing a project named "optimization of a solar heating system combined with dual-source heatpump(dual-source:water in storage tank and outdoor air)" in trnsys for my master degree thesis, the system is just used for space heating in heating season at a high and cold area where the solar radiation is not so good.The schematic diagram of the system is as follow: 
> 
> I want to find the best configuration of the system (include the area of the collectors, the angle of azimuth&dip of the collector, the constant flowrate of the collectors, the volume of the storage tank ) .when i simulated it in trnsys and genopt using PSO ,i tried to set the object function as the sum of energy consumption in a year or the life circle cost of the system ,it turned out that the optimised area of collector is awalys to be the low limit of the collectors range i set in the genopt, may be it is the truth,i am confused. 
> 
> another question which is really important to me: 
> 
> Has anyone has the experience of optimization in similar system?how to confirm the best area of collector of the system? 
> 
> any advice is much appreciated. 
> 
> Ware 
> 
> best regards 
> 
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> TRNSYS-users at lists.onebuilding.org
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