Re:

["David Bradley" <bradley@xxxxxxxxxxxxxxx>]

>Dear TRNSYS users
>
>I am using the TRNSYS program to simulate a thermal building model
>integrated with the PV facade. The Type19 - single zone building model is
>used in the simulation for the project. Now, I really want to check the
>heating load and the cooling load of the building generally.  For this
>purpose, I can use Type19, mode 1-Energy rate control. However, the real
>heating or cooling system is not working at night or weekend. This means
>that the building performance can be simulated by the mode 1 - energy rate
>control, during the working day and by the mode 2 - Temperature control (in
>Type19), during weekends and nights. But, the mode 1 and mode 2 cannot be
>used in one simulation. Also, I tried to use mode 1 in which I can set the
>heating setpoint and the cooling setpoint as the real values during the
>working day, while set the setpoints as the very large ( and small) values
>such that the calculation is performed as the mode 2  during the night and
>the holiday (Actually, there are no controls in the mode 2). If these two
>setpoints are the INPUT variables, I can use Type 14 to treat these two
>variable setpoints as the forcing functions. However, these two setpoints
>are the PARAMETER variables in Type 19. This means that the two setpoints
>are the fixed numbers for the whole simulation.  So, this intention is
>failed. 
>
>For the problem above mentioned, are there any TRNSYS users who can help me
>to solve?&
>Thanks very much!
>
>
>Li Mei
>CREST
>Loughborough University
>Loughborough LE11 3TU
>U.K.
>Tel: 44 (0)1509 228140
>Fax: 44 (0)1509 263171
>

Dear Li
I think you have two options here. First, you could use a Type14 to define
a function that has the value 1 during the day and a value of 0 during the
nights and weekends. Then, multiply the sensible load OUTPUT of Type19 by
the forcing function in order to obtain the loads for your actual building.
The other alternative is to move the two set point PARAMETERS to INPUTS.
This is not a very difficult procedure and if you are usure of how to go
about it, I would be happy to write out some instructions in an email. For
this second option, you will need a Fortran compiler.
Cheers,
	David

 
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David BRADLEY
1500 Engineering Drive		ph: +1 608 263 1589
Madison, WI				fax: +1 608 262 8464
53706 
URL: http://sel.me.wisc.edu/trnsys
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