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

[Dr Yi Zhang]

Ware (?), as you can see, energy consumption and cost may be on very
different scales. It is not logical to add them together to form an
objective. If the cost numbers are much higher than the energy numbers, the
combined objective will be dominated by the cost results, thus dictating the
minimum collector area outcome. You have two options here, to use the life
cycle cost alone as the objective (as the energy cost should have been
factored in), or to switch to a multi-object approach.

 

Jeff, optimisation should not be that hard. I would suggest trying out
jEPlus+EA or other GA-based tools. In most cases you can throw in all your
design variables and let the algorithms do the hard work. The problem with
the tiered search strategy is that you are likely to narrow down the results
prematurely (i.e. within the ballpark) and miss solutions elsewhere. The
magic with optimisation is that it can give good solutions that you have
never expected to exist. :-) 

 

Regards,

 

Yi

 

From: TRNSYS-users [mailto:trnsys-users-bounces at lists.onebuilding.org] On
Behalf Of Free
Sent: 14 April 2016 09:38
To: trnsys-users
Subject: Re: [TRNSYS-users] (PLEASE)optimization of a solar heating system
combined with dual-source heatpump

 

Dear Yi, Jeff, Marko

Sincerely thank you for your answers!

The PSO in GenOpt is a Single - objective algorithm,i have tried to set the
object function as the sum of energy consumption in a year or the life
circle cost of the system, and the result  coincided with Jeff's reply
exactly. I will try a parametric analysis for system to find the problem as
well.

Here is another question for Jeff:

<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)>

I am eager to realize the object function and the criterion that you used
for optimization，can you give me some suggestions for the unfavorable
situation i struggled in?

Sorry to bother you again.

Ware 

BR

 

 

 

 

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