[TRNSYS-users] Negative gains

[David Bradley]

Ken,
The easiest way that I have found to do this is to define the gain as an 
INPUT instead of as a constant value or a schedule. You can either take 
the convective and radiative power as inputs or you can set the 
radiative and convective powers to constant values that represent the 
fraction of the gain that is convective and radiative (for example, if 
your cooling is 90% radiative and 10% convective, set the convective 
power to 0.1 and the radiative power to 0.9). Then you set the scale of 
the gain as an input. This number will then be the total cooling of your 
open case, will be passed to Type56 as a single value, and will be 
broken up into its convective and radiative parts. Note that in the 
above example, I assumed that the gain is 100% sensible, which is 
probably not the case. You can add in a dehumidifying effect as well by 
passing a negative latent gain to the space using another INPUT.
Kind regards,
David




Ken HATAKEYAMA wrote:
> Dear TRNSYS users,
>
> I am trying to model a cold source, like an opened showcase of some
> drinks in a store.
> TRNBuild does not allow to set a negative value to Gains. Now, instead
> of this way, I think to use ventilation with low temperature air.
> But if thre is a direct way to set negative gains to zones, I will adopt it.
> Thanks in advance for your help.
> Best regards
>
> ======================================================
>  Ken Hatakeyama
>  Imagic Design Co Ltd (hatakeyama at imagicdesign.co.jp)
> ======================================================
>
>
>
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>
>
>   

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