[TRNSYS-users] Outputs of Type 56 !
ts0g .
tsogas8 at hotmail.com
Fri Jun 8 08:11:49 PDT 2012
Dear TRNSYS users ,
I have imported a 3d
model ,from trnsys 3d plug-in for sketchup, into the Simulation Studio. I am using Type56 to generate my building's air temperature ( TAIR ) ,
and the sensible heating&cooling demand of airnodes ( QHEAT-QCOOL ) . I have created 5 different thermal airnodes and my question is , which type should I
use as an output in order to retrieve my results, after simulating, in a .txt file so I can process them and compare them with some theoretical measurements concerning
these specific thermal zones.
Thank you for your help !
Kind regards,
Kostas
--Forwarded Message Attachment--
From: d.bradley at tess-inc.com
CC: trnsys-users at cae.wisc.edu
To: ricardo.palomar at hotmail.com
Date: Wed, 6 Jun 2012 14:09:13 -0500
Subject: Re: [TRNSYS-users] Type 1716: ROTARY DESICANT DEHUMIDIFIER
Ricardo,
Without seeing the input file, its hard to know what the problem
might be. If you can please send your project to me (directly,
please do not reply to the entire list) then I can have a look.
Kind regards,
David
On 6/6/2012 06:03, Ricardo Palomar Calahorra wrote:
Hello !!!
I´m trying to use the type 1716: ROTARY DESICANT
DEHUMIDIFIER, but I´m having always the same problem, when I
run the simulation the outputs 8 and 12 (Regeneration air relative humidity,
and Condensate flow rate) are "0.00". And the outputs 2 and
3 (Process air outlet humidity ratio, and Process air outlet relative humidity) are
inconsistent.
Exist any problem running this type?
Thanks !!!
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--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
--Forwarded Message Attachment--
From: d.bradley at tess-inc.com
CC: trnsys-users at cae.wisc.edu
To: mattia.rio at mail.polimi.it
Date: Wed, 6 Jun 2012 14:14:47 -0500
Subject: Re: [TRNSYS-users] Shading groups
Mattia,
I think you will have to be a little creative here. Shading
devices in Trnsys3D are assumed to be opaque as you know so I don't
think you can define the shading surface in there. You could use
Type34, which models simple overhangs and/or wingwalls. That model
also assumes an opaque shader but it gives outputs for various
shading fractions and view factors. You may be able to use those and
the unshaded radiation from your weather component to get an
estimate of the radiation that comes through your not-quite-opaque
device. Lastly, Type56 allows you to enter a shading factor for any
given window. You may be able to treat your shaders in that manner.
Unfortunately, there is not a direct way to treat semitransparent
shaders unless you would care to modify Type34.
Kind regards,
David
On 6/6/2012 10:11, MATTIA ANDREA RIO wrote:
Hi!!! i have a little problem with my imported 3d
model from trnsys 3d plug-in for sketchup.
I have posted a picture that show my 3d model in sketchup; so, as
you can see, all of the triangular surfaces (into red circle), are
made in perforated corten steel, and i need to give a shading
coefficient to their, otherwise the program will do the
simulations considering the shading surfaces opaque; but actually
they are not matt.
if someone have any ideas about how I can do.....
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TRNSYS-users mailing list
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***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
--Forwarded Message Attachment--
From: d.bradley at tess-inc.com
CC: trnsys-users at cae.wisc.edu
To: damien.casetta at gmail.com
Date: Wed, 6 Jun 2012 14:27:41 -0500
Subject: Re: [TRNSYS-users] Water-to-water heat pump - Heat rate to load control
Damien,
In my experience, there are relatively few heat pumps available on
the market that can do what you are trying to do. Most heat pumps
have a fairly fixed capacity (some have multiple stages) so that
they have an easier time maintaining a fixed temperature rise than
they do in maintaining a fixed temperature outlet. There is at least
one notable exception to this; an air-to-water heat pump that has a
variable speed compressor that allows it to modulate and maintain a
target outlet temperature.
Type927 is a temperature level control device meaning that it is
looking for inlet water conditions on both sides and for a control
signal. If you have obtained your heating loads from some other
software tool, I would recommend that you read them into TRNSYS
using Type9 and impose them on a water stream using Type682 from the
TESS Loads and Structures library. I would then place a thermostat
sensing water return temperature in the loop and I would use its
output to turn on the loop pump and the Type927 heat pump. You will
not get a constant supply temperature of course but in reality, a
single stage (or even multi stage) heat pump can't really give you a
constant supply temperature; it can only give you a supply
temperature that hovers around a set point.
If you are using Type56 to generate your building's heating
demand, I would take it out of energy rate control (ie turn OFF the
automatic heating and cooling types in TRNBuild), and allow the zone
temperatures to float. I would then use a thermostat watching the
zone air temperature and some kind of delivery device (a fan coil,
radiant floors, etc.) to deliver the hot water from the Type927 to
the zone.
Kind regards,
david
On 6/6/2012 12:20, Damien Casetta wrote:
Hi,
I am trying to handle this problem by controlling the
temperature. Let me remind you that I want to control the heat
load of an heat pump in heating mode.
Here is how I am trying to proceed :
- I control the temperature exiting the heat pump
- I fix a temperature set point (with an aquastat - heating
mode) at 50 C.
- I vary the supply temperature (entering the heat pump)
according to the heating demand.
The heating demand is based on hourly loads.
What do you think about it?
I am not very satisfied but I will give it a try. I am sure
there is a much simpler way to do it.
Thanks in advance for your help.
Best regards,
On 1 June 2012 18:10, Damien Casetta <damien.casetta at gmail.com>
wrote:
Hi,
I am modelling a ground-source heat pump system
including a water-to-water heat pump (type 927), a
borehole heat exchanger (type 557b) and a building demand
profile.
I have read a couple of messages in the archives about
this topic but I haven´t understood correctly the few
addressing my specific issue.
Here is my point. I assume the heat pump to meet the
building demand. The aim is then to force the heat pump
load and observe how the system behaves (COP, ground loop
fluid temperatures).
I would be able to do this with an external MATLAB code
(with COP values interpolated from catalog data) but it
would be a shame not to harness TRNSYS potential (there is
no need to re-invent the wheel as I read in a previous
message).
Let me put in other words: how to control a heat pump
load?
I have read about a trick to handle this, with a "lump"
temperature but I don't get the idea behind it. Any other
explanations is welcomed.
Thanks in advance,
Best regards,
--
Damien Casetta
Chalmers
University of Technology | Energy
and Environment | Exchange student
INSA Lyon Génie
Energétique et Environnement | Elève ingénieur
+46.7.60.66.31.45
+33.6.71.78.03.75
--
Damien Casetta
Chalmers
University of Technology | Energy and
Environment | Exchange student
INSA Lyon Génie Energétique et
Environnement |
Elève ingénieur
+46.7.60.66.31.45
+33.6.71.78.03.75
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users at cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users
--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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