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error during simulation

Posted: Mon Dec 18, 2017 6:18 pm
by ragamounika22
hello,
i am currently trying to simulate the space heating and cooling with geothermal and solar flat plate collectors. i end up the simulation with this error.please help me out to get the accurate results.

Re: error during simulation

Posted: Tue Dec 19, 2017 11:46 am
by Lars Kunath
Dear ragamounika22,

first of all your results seem to be alright. The warning appears because you didn't deliver the required energy demand to your building there can be several reasons for that. I recommend to check following:
- size of the heat pump
- size of heat exchangers
- why does the max. temperature at source side of the heat pump is exceeded (maybe you need a mixing valve there or you can change the point for the high temperature failure)

I hope this helps you.

BR Lars

Re: error during simulation

Posted: Thu Dec 21, 2017 9:21 am
by ragamounika22
hello sir,

when i try to simulate the system which is not the template of the polysun , i come up with the error attached below. please help me out of it.

Re: error during simulation

Posted: Thu Dec 21, 2017 4:22 pm
by Lars Kunath
Dear ragamounika22,

it seems that you have more than one pump in a hydronic circuit (maybe two pumps in series) which is not allowed in Polysun.

Please be aware that the hydronic circuits needs to be defined that you can generate in each of them a clear flow.

I hope this helps you, if not please sent a screen shot of your hydronic.

BR Lars

Re: error during simulation

Posted: Fri Dec 22, 2017 6:38 am
by ragamounika22
hello sir,
i would like to simulate the system below. It was simulated in TRNSYS software and i would like to simulate it in polysun . can u please help me out in the designing of the system. can i design in the same way as in the picture shown in polysun or any changes required ?
thank you

regards,
Mounika.

Re: error during simulation

Posted: Wed Jan 03, 2018 9:13 am
by Lars Kunath
Dear ragamounika22,

please see under "standard templates" -> "hybrid collector systems" here you will find a system which is similar. Anyway the hydronic will not be exactly the same and you need to define for your location a suitable control strategy.

I hope this helps you.

Best regards,

Lars

Re: error during simulation

Posted: Wed Jan 17, 2018 7:51 am
by ragamounika22
sir,
I am trying to simulate 66a template "" space heating and cooling by flat plate and ground source loop" for a small family low energy building.


- i come up with the error cooling capacity of the building not met and source side temperature at the heat pump exceeded. i placed a mixing valve controller at the heat pump to decrease the source the side temperature but there is no change in the result .

-i set heat pump operation mode as "heating and cooling".to deliver heating demand and cooling should i set fan coil operation mode as "heating and cooling" or left as heating as given in the template?

- why the energy flow diagram is not displaying for this template ?

- shall we use 59g template for heating and cooling by changing heat pump operation mode ?
hope you kindly help me and respond as early as possible .

regards,
B.Mounika

Re: error during simulation

Posted: Wed Jan 17, 2018 8:41 am
by Lars Kunath
Dear Mounika,

"i come up with the error cooling capacity of the building not met and source side temperature at the heat pump exceeded. i placed a mixing valve controller at the heat pump to decrease the source the side temperature but there is no change in the result"

-> you should check if you can generally deliver enough cooling energy to your system (storage tank) if yes you should check if there might be a mistake in the cooling distribution system (enough cooling modules, control strategy etc.) in case of not having enough cooling energy in the storage tank your heat pump or heat pump control strategy might be the reason for your deficit.

-i set heat pump operation mode as "heating and cooling".to deliver heating demand and cooling should i set fan coil operation mode as "heating and cooling" or left as heating as given in the template?

-> leave the settings as they are given in the template

- why the energy flow diagram is not displaying for this template ?
hope you kindly help me and respond as early as possible .

-> since you bring energy in the borehole and take energy out of it Polysun can not deliver a proper energy flow diagramm (double counting of energy) so it simply dont plot one.

regards,
B.Mounika

Re: error during simulation

Posted: Wed Jan 17, 2018 5:28 pm
by ragamounika22
sir ,
if i set fan coil operation mode as "heating" then i am not getting this particular error "cooling capacity of the system not met" . if i set fan coil operation mode as ""heating and cooling " to provide space heating and cooling then i come with this error "cooling capacity not met" .

-To provide heating and cooling by 66a template, what to set for fan coil operation mode? either heating or heating and cooling?

can you please explain the below sentence at length ?

you should check if you can generally deliver enough cooling energy to your system (storage tank) if yes you should check if there might be a mistake in the cooling distribution system (enough cooling modules, control strategy etc.) in case of not having enough cooling energy in the storage tank your heat pump or heat pump control strategy might be the reason for your deficit.

Re: error during simulation

Posted: Mon Jan 22, 2018 10:28 am
by Lars Kunath
I would recommend to cross check if the cooling energy demand has a similar value as the delivers cooling energy than you can see if it is a reasonable error for you. Also we recommend for heating and cooling systems to use a heating loop and a cooling loop - the heating and cooling works only if you use the Polysun building model.

BR