[TRNSYS-users] type 109 - rain as output

[Diego A. Arias]

Dear Elisabeth,

Type89 is reporting the information that is in the TMY2 data file. On 
NREL's website for the TMY2 user's manual 
(http://rredc.nrel.gov/solar/old_data/nsrdb/tmy2/), you can find the 
following information:
- The precipitable water is calculated from radiosonde data.
- The uncertainty flag (7) for the precipitable water indicates that the 
"uncertainty is consistent with NWS practices and the instrument or 
observation used to obtain the data".

So, my understanding is that the value for precipitable water is 
calculated from other measurements. The uncertainty propagation of the 
instrument precision results in a minimum value that is greater than zero.

Best regards,

Diego

Elisabeth Aslanian wrote:
> Hi everybody
> i am doing a natural ventilation model under trnsys/comis and i need to 
> check if it is not raining outside to open my windows.
>
> as the rain is not a output of the ype 109 i tried to use the type 89d (my 
> simulation starts mid april) but i don't think the output i get as the 
> precipitable water is really the rain - i join a excel file where you can 
> see what kind of value i get.
>
> i tried too to add the rain as output in the type 109. the rain values have 
> to be retrieved with the "field position 116" but i don't figure out what it 
> is and where they are.
>
> thank you for heping me!!1
>
> Elisabeth
>
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-- 
Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706