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

[Jeff Thornton <thornton@tess-inc.com>]

<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@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@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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