[TRNSYS-users] Type666’s stage control

[David BRADLEY]

Wu,
   Type666 models a chiller that can modulate its capacity using 
internal controls to maintain a steady chilled water outlet temperature. 
I would think that using the chiller on/off signal would result in the 
outlet chilled water temperature either being equal to the inlet 
temperature or being equal to the user-defined chilled water setpoint 
temperature so long as the chiller has enough capacity to meet the 
setpoint. Usually when I have seen staged chillers in a project each 
chiller is able to modulate its capacity internally and multiple 
chillers are staged sequentially as they reach their respective 
capacities. I have not run across a chiller that did not have the 
ability to run at part load so as to maintain a setpoint. If you are 
looking for a model of a chiller stack that contains multiple variable 
capacity chillers then I have written such a component. In order to use 
it you would need to define equations or use a controller component that 
would decide how many of the chillers should be on at any given time. If 
you are interested in purchasing the component, please contact me 
directly and I can estimate the cost.
kind regards,
  David


On 10/28/2015 00:12, 吴伟伟v v wrote:
>
> Dear users,
>
> Hi all!
>
> I’m using TRNSYS to model a typical HVAC system,i.e.,chiller( type666) 
> and fan coil(type 508a) combined a building model(type 56). I set a 
> room thermostat(type645) for room temperature control, but I found 
> that the chiller has oscillations which result in chilled water 
> temperature fluctuated strongly several times even in an hour。My 
> question is as following:
>
> 1.Is there any idea to control Type666 to output its cooling capacity 
> as 0.25,0.5,0.75, 1,like stages control?
>
> 2.Should I set more chiller(equally sized) in the model to realize the 
> number of chillers control instead of one chiller?
>
> I did not found the relevant information in the forum. Can someone 
> please help me with this issue?
>
> With best wishes
>
> Yours sincerely
>
> Wu weiwei
>
>
>
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> TRNSYS-users at lists.onebuilding.org
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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