[TRNSYS-users] building model for a cold load simulation

[瞳瞳]

Dear Jochen,

Danke für Deine Antwort.

I have tried to do  what you told me, and i got the right pictures . But i
found something very strange.
1.  The simulation of the whole July is not the same like just the 23. July
,  and there is  a very big difference. Still i don't know why.
2.  I have tried to caculate the cold load with vdi 2078 in excel, there is
also a very big difference . I think maybe it's because of the gains in
TRNBUILD. i want 2 persons, 2 computers and a light with 100W.  So i made
the gains just like what the picture shows.

Can anyone help me?

Thanks and best regards,

Leona



2011/8/8 Jochen Doell <jochen.doell at ise.fraunhofer.de>

> Dear Leona,
>
> you can do just one thing at a time: Simulate the free floating room
> temperatures when no heat/cold is supplied OR simulate the cold/heat demand
> when the room is kept at certain temperature.
>
> What you did is a simulation without a heating/cooling system, so you got
> the temperature profile.
>
> You need to turn on the aux cooling system in TRNBUILD (assuming you use
> type 56) and give the building a desired maximum temperature (constant
> value, input or schedule). When the room temperature reaches the maximum
> temperature, you cooling system will start to operate, keeping the room
> below the temperature. Q_sens is the (negative) cooling demand.
>
> Best regards,
> Jochen
>
> Am 20:59, schrieb ͫͫ:
>
>  Dear all,
>>
>> i want to make a building model for the simulation of cold load.It is just
>> one room with one external wall and 2 unair-conditioned next rooms(one is
>> the lobby the other is the upper room).
>>
>> Questions are
>> 1. I tried to run the simulation, but the cold load is always 0, like the
>> picture in the mail.
>> 2. i think the temp. is also not correct ,but i don't know why.  ps. i
>> just
>> want to simulate the temp.and the cold load in 23. July in the zone.
>>
>> Can anyone help me?
>>
>> Thanks and best regards,
>>
>> Leona
>>
>>
> --
> ______________________________**___________________
>
> Dipl.-Ing. (FH) Jochen Döll
> Division Thermal Systems and Buildings
>
> Fraunhofer-Institut für Solare Energiesysteme ISE
> Heidenhofstrasse 2, 79110 Freiburg, Germany
>
> Phone: +49 (761) 4588-5468 Fax: +49 (761) 4588-9000
> jochen.doell at ise.fraunhofer.de
> www.ise.fraunhofer.de
> ______________________________**___________________
>
>
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