[TRNSYS-users] building model

[David Bradley]

Bertrand,
   The building model that you choose to use 
depends on the complexity of the building that 
you are trying to model. If you have a simple, 
single zone building that can be represented as a 
single temperature (walls and air at the same 
temperature) then you can use Type88. If you have 
a multizone building but one in which you can 
represent the walls and air of each zone with a 
single temperature, then you can use Type660, the 
TESS Library multizone version of the Type88 
lumped capacitance building. If you have a more 
complex building and are concerned about more 
accuracy in calculating solar radiation effects, 
interior surface temperatures, etc. then you should use Type56.

   There are some models of spit system air 
conditioners in the TESS HVAC Library so you 
would not have to model the evaporator, 
condenser, compressor, and valve separately. If 
you want to model the refrigeration cycle you can 
of course but one of the difficulties of doing so 
is that the time constant for changes in the 
refrigeration cycle is very short (on the order 
of a second) while the time constant of the 
building is on the order of 5 to 15 minutes 
usually. Often there arises a difficulty in 
choosing a time step for your simulation that 
results in an accurate model of both the building and the refigeration cycle.
Kind regards,
  David


>Dear all'
>i want to model a building in which we have an air conditionner with TRNSYS.
>I don't know the proper component i should use 
>for the building: Type 88, 56, 34, 12, ..??
>
>the air conditioner is part of a vapor 
>commpresion refrigeration system where the 
>evaporator should be in the building. for this, 
>could you tell me which components  i can use 
>for the evaporator, the condenser and the throtlle valve?.
>
>yours,
>
>
>
>
>------------------------
>TCHANCHE FANKAM Bertrand
>
>C/O SUH Christopher
>22 kadmeas-BOTANIKOS
>Athens, GREECE
>mobile:+30 69 42 95 59 52
>
>
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Thermal Energy System Specialists (TESS), LLC
David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley at tess-inc.com
Web Pages:  http://www.tess-inc.com     and      http://www.trnsys.com

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