[TRNSYS-users] Control signal for GSHP

[David BRADLEY]

Metkel,
   Control signals in TRNSYS are almost always a value between 0 (off) 
and 1 (on) and you can write equations using Boolean logic to set them. 
For example, if you define a variable called Tambient then you could 
write an equation such as:

yHeat = LT(Tambient,14)

the variable yHeat would have a value of 1 as long as the variable 
Tambient was less than 14. You can also use the same idea to set 
multipliers on input or output data. For example, if your Type9 is 
simply reading a value of load without any indication of whether it is a 
heating load or a cooling load then you could write the following two 
equations:

heatLoad = Type9output*LT(Tambient,14)
coolLoad = Type9output*GT(Tambient,18)

Kind regards,
  David


On 2/6/2014 06:02, metkell yebiyo wrote:
> Dear TRNSYS users,
>
> My name is Metkel, I am a researcher at London South Bank University, 
> I am currently trying to simulate a GSHP system. the GSHP is 
> controlled by the outside temperature, if the outside temperature is 
> less than 14 then a control signal  tells the GSHP to run in heating 
> mode, if the outside temp is greater than 18 then the control signal 
> tells the GSHP to run in cooling mode.
>
> However I couldn't figure out how to write the equation to the 
> following please.
> 1. based on the outside temperature to send a signal to the heat pump.
> 2. based on the outside temperature to retrieve the cooling or heating 
> load of the building from
>     type 9a which contains the building load.
> 3. based on the outside temperature to also send a signal to the 
> circulation pumps to switch them
>    on or off accordingly.
>
> Any suggestions would be much appreciated please.
>
>
> Regards,
> Metkel
>
>
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20140217/f61cc10b/attachment-0004.htm>