Re: info about TYPE 35

[Michaël Kummert <kummert@xxxxxxxxxxxxx>]

Pietro,

I would recommend that you use Type 56 to simulate the building, even if 
you only have one thermal zone. Type 56 includes a detailed glazing 
systems model that uses data from the WINDOW program developed by LBNL.
Using Type 56, the window is part of the building structure and you 
don't have to use tricks like internal gains.
Type 56 also takes into account solar radiation that leaves the room 
through the window after reflection inside the zone

Please take a look at the Type 56 manual for more details.

Kind regards,

Michaël Kummert




on 2004-04-08 05:03, Pietro Filippi wrote:
> Hi,
> I am a new user of TRNSYS (version 15), so I am a beginner. I just
> studied examples 5, 6 and 7.
> I have a generic office room 5x5x3.1 m (LxWxH) in a side of a big
> building, at 30 deg of azimuth. Its external wall is (almost) entirely
> made of glazings.
>
> - Simulation 1:
>
> I use type 19 Wind-2 with:
> Diffuse transmittance	0.21	dimensionless
> Inside convection coefficient	28.8	kJ/hr.m^2.K
> Transmittance	0.21	dimensionless
> Loss coefficient	4.9	kJ/hr.m^2.K
> Fraction striking illuminated surface	1	dimensionless
>
>
> - simulation 2:
>
> I use type 35b combined to type 19 Wind-1 (as in example n.7 but without
> overhang). Type 35b has:
> Number of glazings	3	dimensionless
> Extinction	0.05	dimensionless
> Refractive index	1.526	dimensionless
> All other parameters and input are not varied respect to sim 1. 
>
> - simulation 3:
>
> I use type 35a in the place of type 35b. The output-input connections
> between 35a and 18wind1 are:
>
> Energy flow to room ----> Thermal energy gain
> Solar radiation to room ----> Total solar through the window
> Thermal energy to room        Beam rad through window 0
> 					Frac striking illuminated
> surface 1
>
> Considering the simulation output QCOOL I got that the Sim2's QCOOL is 5
> times sim1's while sim3's QCOOL is 3.5 times sim1's!!!!! 
> How is it possible?
>
> What can be the most appropriate modelling setting for simulating this
> kind of room?
> Is sim1's model too simple or sim2's inadequate?
>
> In sim 3 I considered type19 wind1 input "Thermal energy gain" as total
> gain even if in type 35a output is specified that "thermal energy" is
> the one from the ambient. So I connected its first input (Energy flow to
> room) to the input "Thermal energy gain"  because it rappresents the
> total. I left "Beam rad" unconnected and set to 0 cause it is just a
> part of the total radiation through the window.
>
> Is there anybody that can tell me where I am wrong?
> I hope you can help me very soon! (my boss needs result...)
> With regards 
> Pietro Filippi


--
_________________________________________________________

Michaël Kummert

Solar Energy Laboratory - University of Wisconsin-Madison
1303 Engr Res Bldg, 1500 Engineering Drive
Madison, WI 53706

Tel: +1 (608) 263-1589
Fax: +1 (608) 262-8464
E-mail: kummert@xxxxxxxxxxxxx

SEL Web Site: http://sel.me.wisc.edu
TRNSYS Web Site: http://sel.me.wisc.edu/trnsys