Re: [EnergyPlus_Support] EnergyPlus and Coupling TRYSNS/COMIS

["Michael J. Witte" <mjwitte@xxxxxxxx>]

I will attempt to differentiate COMIS, TRNSYS, and EnergyPlus for you.

"COMIS models the air flow and contaminant distributions in 
buildings. The program can simulate several key components 
influencing air flow: cracks, ducts, duct fittings, fans, flow 
controllers, vertical large openings (windows and/or doors), kitchen 
hoods, passive stacks, and user-defined components."  (quote from the 
COMIS website http://epb1.lbl.gov/comis/ )

TRNSYS is a transient systems simulation program with a modular 
structure. It recognizes a system description language in which the 
user specifies the components that constitute the system and the 
manner in which they are connected. The TRNSYS library includes many 
of the components commonly found in thermal energy systems, as well 
as component routines to handle input of weather data or other time-
dependent forcing functions and output of simulation results.  (qoute 
from TRNSYS website http://sel.me.wisc.edu/trnsys )

EnergyPlus is a new building energy simulation program for modeling 
building heating, cooling, lighting, ventilating, and other energy 
flows. EnergyPlus builds on the most popular features and 
capabilities of BLAST and DOE-2 but includes many innovative 
simulation capabilities such as time steps of less than an hour, 
modular systems and plant integrated with heat balance-based zone 
simulation, multizone air flow, thermal comfort, and photovoltaic 
systems.  (quote from EnergyPlus web site www.energyplus.gov )

In my own words . . .

COMIS is only an airflow model and does not model the envelope heat 
transfer, solar gains, mechanical systems, etc.  EnergyPlus is a 
comprehensive building energy simulation tool which is capable of 
detailed modeling of both the building envelope and the HVAC 
mechanical systems.  COMIS has been linked into EnergyPlus in order 
to provide complex airflow modeling capability.  Also a limited 
version of TRNSYS has been linked in to provide modeling of 
photovoltaics.  I am not a TRNSYS user, but my understanding is that 
TRNSYS is focused heavily on system simulation with less 
comprehensive building envelope capabilities.  While EnergyPlus 
offers very flexible HVAC system descriptions, my understanding is 
that TRNSYS users can have more direct control over the way in which 
a system is modeled and can more readily add new component models.

Mike Witte





On 17 Jul 2002, at 6:56, rmp4aup6 wrote:

> Dear all:
> 
> I think most of you know these two or three softwares. 
> But I am confused with the function of these programs.
> May I know what is the detail difference between them??
> TRYSNS--thermal simualtion
> COMIS--air simulation
> Energyplus--energy simluation 
> Thank you very much.
> 
> rmp4aup6
> 


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