[TRNSYS-users] radiant cooling and heating model control

[David BRADLEY]

Sherif,

   Using a differential controller will work but Trnsys18 also has some 
just-plain-thermostat models (Type106 or Type166) that might be easier 
to implement. You'll need two connections. One connection might come 
from an equation or a combination of an equation and a forcing function 
that results in the temperature that you want the boiler to supply. The 
equation might be:

isSummer = AND(GT(TIME,3624),LT(TIME,6552))
isWinter = 1-isSummer
boilerSetPoint = 85.*isSummer + 40.*isWinter

The other connection will be the temperature that is being monitored to 
decide whether the boiler should be on or off. Again you'll probably 
need some equations here so that the decision to turn on the boiler can 
come in summer when conditions are such that you want to run the chiller 
or in winter when you want heat.

kind regards,

  David



On 07/08/2021 17:14, SHERIF SAIED via TRNSYS-users wrote:
> checked Thanks, I have another question I used a differential 
> controller to the boiler type 700 and need temperature out of it in 
> the range between 80-90 in summer(cooling season) to supply absorption 
> chiller and need temperature in winter(heating season) in the range of 
> 30-45. I linked the upper input Temp.(Th) to outlet of the boiler, 
> linked the lower input Temp.(TL) to the return flow from the tank to 
> the boiler. for monitoring Temp. (Tin),upper dead band(dt) and lower 
> dead band(dt) I don't really know how to link or what value should be. 
> could anyone help, please?, Thanks in advance.
>
> On Tue, Jul 6, 2021 at 8:32 PM David BRADLEY <d.bradley at tess-inc.com 
> <mailto:d.bradley at tess-inc.com>> wrote:
>
>     Sherif,
>
>       There are a number of examples in the
>     .\Trnsys18\Examples\HVACTemplates\ folder that will give you some
>     ideas about how to implement control of HVAC systems. Have a look
>     at the 10-Examples.pdf documentation in parallel with those
>     examples. I don't think that any of them have a radiant floor in
>     them but the principals are the same.
>
>     You might also have a look at the example:
>
>     .\Trnsys18\Examples\Feedback Control\SunSpace - Floor heating PID
>     controller.tpf
>
>     Its controls are possibly more complicated than the ones in your
>     case but it will show how to do the system-level connections
>     between Type56's active layers and the HVAC system.
>
>     kind regards,
>
>      David
>
>
>
>     On 07/06/2021 10:20, SHERIF SAIED via TRNSYS-users wrote:
>>     Hello everyone,
>>
>>     I need help in some controls on radiant cooling and heating
>>     system model like type 165 to control either boiler for heating
>>     system or control building temperatures, also need to control on
>>     different components for the cooling system to work uniformly
>>     according to season if summer cooling system work and if winter
>>     will work the heating system and so on . I have problems in PPD
>>     and PMV for building through all year. if anyone would help or
>>     have an example model for how I can set these controllers in two
>>     systems?
>>     Regards,
>>     -- 
>>     *Sherif Saied.*
>>     *Tel: (*+2)01004419468 / (+2)01124348957
>>
>>
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>
>     -- 
>     ***************************
>     David BRADLEY
>     Principal
>     Thermal Energy Systems Specialists, LLC
>     3 North Pinckney Street - suite 202
>     Madison, WI  53703 USA
>
>     P:+1.608.274.2577
>     d.bradley at tess-inc.com  <mailto:d.bradley at tess-inc.com>
>
>     http://www.tess-inc.com  <http://www.tess-inc.com>
>     http://www.trnsys.com  <http://www.trnsys.com>
>
>
>
> -- 
> *Sherif Saied.*
> *Tel: (*+2)01004419468 / (+2)01124348957
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

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

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

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