[TRNSYS-users] Restaurant absorp. cooling Tess example

David BRADLEY d.bradley at tess-inc.com
Fri Apr 25 07:14:27 PDT 2014

   You are correct; Type107 is designed so that it takes the chilled 
water set point as an input and provides the required power as an 
output. If you are working on a simulation where you have a certain 
amount of power available (from a PV or a wind turbine) then what you 
can do is to implement two instances of Type107 in your simulation. One 
of them would be running all the time (i.e. it's control signal input is 
always set to 1) with its cooling water, hot water, and chilled water 
inputs connected but none of its outputs connected. The only output that 
you would use would be the required power. This instance of Type107 
would be in your simulation only to determine how much power would be 
required in order to run an absorption chiller under current conditions. 
The required power would feed into an equation that would compare the 
required power to the power that you actually have available. If you 
have more power than you need then the equation's value would be 1. If 
you don't have enough power to run the chiller then the equation's value 
would be 0. The result of the equation would be sent as the control 
signal to a second instance of Type107 that is identical to the first 
except that it is not always on and its outputs (the outlet cooling 
water, chilled water, and hot water outlet conditions) are connected.
   In essence you are using a virtual chiller to determine a control 
signal for the actual chiller.
Kind regards,

On 4/25/2014 04:17, Martin Berov wrote:
> Thank you, I found the weather block it was in the hidden layer.
> I have one more issue, as I understand the absorption chiller always 
> modulate its power so it can reach the chilled water set point 
> temperature? - so does it mean that with this type 107 it is not 
> possible to make simulations with different chiller powers(rated 
> capacity) and see how they affect on the system?
> Kind regards
> Martin
> On Fri, Apr 25, 2014 at 2:48 AM, Jeremy Osborne 
> <jeremy.osborne at solem-consulting.com 
> <mailto:jeremy.osborne at solem-consulting.com>> wrote:
>     Hi Martin,
>     The weather data is hidden in a layer. Go to view -> show layers
>     -> and enable weather - data files and you should see TYPE15-2
>     appear with all the connection.
>     Layers are used to better organise complex models, removing
>     certain clutter.
>     Regards,
>     Jeremy
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>     *From:*Martin Berov [mailto:martber88 at gmail.com
>     <mailto:martber88 at gmail.com>]
>     *Sent:* Thursday, 24 April 2014 8:02 PM
>     *To:* trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>
>     *Subject:* [TRNSYS-users] Restaurant absorp. cooling Tess example
>     Hi,
>     I was looking at the example provided  with the Tess library about
>     the Restaurant absorption chilling, so the simulation runs ok, but
>     I can not find the weather block i.e. the collector and building
>     are not connected to it -how is this possible, how does it
>     function, can someone give me explanation?
>     Thank you
>     Best Regards
>     Martin
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Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

d.bradley at tess-inc.com


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