[TRNSYS-users] How to control absorption chiller (Type 107)

[Mario Humberto González]

Dear Sinchote,

I agree with Jeff, it is better to use a controller with a deadband. Define
two inputs in an equation and compare the outputs from the Aquastat and the
type14 with an AND, then connect the result or output of this equation to
the "Chiller control signal". So, when both are 1 (or ON), your absorption
chiller will be ON.

I don't know why the images didn't attach in the last email, so you can
find the screenshots attached to this one.

Best,
Mario

From: Sinchote Keeratianant <cole_sin at hotmail.com>
> To: "TRNSYS users mailing list at OneBuilding.org" <
> trnsys-users at lists.onebuilding.org>, "thornton at tess-inc.com" <
> thornton at tess-inc.com>
> Cc:
> Bcc:
> Date: Thu, 16 Aug 2018 07:49:54 +0000
> Subject: Re: [TRNSYS-users] How to control absorption chiller (Type 107)
>
> Dear Jeff,
>
> Thank you for your idea.
>
> Did you mean the method as following below right ?
>
>
>
> How can i control 2 condition for absorption chiller working?
>
> If you didn't mean as i said above could you help me how to resolve this
> problem.
>
> Best regards,
>
> Sinchote Keeratianant
>
>
>
>
> ------------------------------
> *From:* Jeff Thornton <thornton at tess-inc.com>
> *Sent:* 16 August 2018 12:39 AM
> *To:* TRNSYS users mailing list at OneBuilding.org
> *Subject:* Re: [TRNSYS-users] How to control absorption chiller (Type 107)
>
>
> The only thing I would add is that you might want to consider using an
> aquastat model instead of the simple "Greather Than" function for the tank
> temperature check.  The aquastat will have a deadband and will converge
> every time while the equation may oscillate between control states and
> cause non-convergence issues.
>
>
>
> Jeff
>
>
>
> ---
> Jeff Thornton
> President - TESS LLC
> 22 N. Carroll Street, Madison WI USA 53703
> Office: (608) 274-2577  Fax: (608) 278-1475www.tess-inc.com
> E-Mail: thornton at tess-inc.com
>
> On 08/15/2018 11:06 am, Mario Humberto González via TRNSYS-users wrote:
>
> Dear Sinchote,
>
> The second condition can be controlled with the type 14h (Utility>Forcing
> Functions>General).
>
>
> And define the schedule in the function editor like this
>
>
> After that, in an equation, you can use a "greater than" to check if the
> tank temperature is above 75 °C. And finally an "and" to compare both
> conditions.
>
> Best,
> Mario
>
>
>
> From: Sinchote Keeratianant <cole_sin at hotmail.com>
> To: Angel Carrera <angel.carrera at aiguasol.coop>, "TRNSYS users mailing
> list at OneBuilding.org" <trnsys-users at lists.onebuilding.org>
> Cc:
> Bcc:
> Date: Wed, 15 Aug 2018 08:22:27 +0000
> Subject: Re: [TRNSYS-users] How to control absorption chiller (Type 107)
>
>
> Dear Angel,
>
> Do you mean combine 2 conditions into equation block and then use these
> result to control absorption chiller (type 107) right?
>
> If yes. Could you tell me how can i combine both into equation block?
>
> I'm looking forward to hearing from your answer.
>
> Thanks.
>
> Best regards,
> Sinchote
>
>
>
>
>
>
> ------------------------------
> *From:* Angel Carrera <angel.carrera at aiguasol.coop>
> *Sent:* 14 August 2018 7:52 PM
> *To:* TRNSYS users mailing list at OneBuilding.org
> *Subject:* Re: [TRNSYS-users] How to control absorption chiller (Type 107)
>
> Dear Sinchote,
>
> You can implement that control by multiplying both of your conditions in
> an equation block, and use the result as your control signal. The first of
> your conditions will work better if you implement it in a type 2 and the
> second can came from some forcing function, hope it helps
>
> Angel
>
> El mar., 14 ago. 2018 10:47, Sinchote Keeratianant via TRNSYS-users <
> trnsys-users at lists.onebuilding.org> escribió:
>
>
> Dear Trnsys users,
>
>       I'm studying in master degree and conducting the simulation solar
> cooling system. I have a problem about how to control the absorption
> chiller model(type 107) working.
>
> I would like to control 2 modes for absorption chiller working :
> 1. Absorption chiller working when temperature in hot water tank reach to
> 75 degree celsius and
> 2. Absorption chiller working on 9.00 a.m. - 22.00 p.m.
>
> The absorption chiller wiil work when both of conditions happen.
>
> Has anyone experienced this problem and knows how to fix it?
>
>
>
>
> Best regards,
>
>
>
> Sinchote
>
>
>
>
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