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Today's Topics:
1. Wind direction in TMY2 (Ratnalee Patil)
2. chiller performance with type 42? (Cramer Silkworth)
3. TRNSYS models for longwave radiation exchange within a zone
(simge andolsun)
4. why the model couldn't converge with a fictif wall represente
direct contact (Yujun TAO)
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Betreff:
[TRNSYS-users] Wind direction in TMY2
Von:
"Ratnalee Patil" <Ratnalee@innovativedesign.net>
Datum:
Mon, 4 Apr 2011 13:36:01 -0400
An:
"Wang, Fu Qiao" <FuQiao.Wang@WSPGroup.com.cn>,
<trnsys-users@cae.wisc.edu>
An:
"Wang, Fu Qiao" <FuQiao.Wang@WSPGroup.com.cn>,
<trnsys-users@cae.wisc.edu>
Dear Fuqiao,
Your guess is correct; N = 0 or 360, E = 90, S = 180, & W = 270.
As Matt mentioned, you can find the convention used for wind direction
in TMY2 data in Table 3-2 on
http://rredc.nrel.gov/solar/pubs/tmy2/tables.html
Regards,
Ratnalee Patil
B.Arch., M.A.Sc. Engineering
Sustainable Design Analyst
Innovative Design
850 West Morgan St.
Raleigh, NC 27603
Ph: (919) 832-6303
Fax: (919) 832-3339
www.innovativedesign.net
-----Original Message-----
From: Matt Duffy [mailto:duffy@tess-inc.com]
Sent: Monday, April 04, 2011 8:55 AM
To: Wang, Fu Qiao; trnsys-users@cae.wisc.edu
Subject: Re: [TRNSYS-users] TRNSYS-users Digest, Vol 76, Issue 2
Dear fuqiao,
I am not sure, but you can refer to the NREL documents about TMY2
weather files. I am confident that the information will be in there.
Best regards,
Matt Duffy
----- Original Message -----
From: "Wang, Fu Qiao" <fuqiao.wang@wspgroup.com.cn>
Sent: Fri, April 1, 2011 22:13
Subject:[TRNSYS-users] 答复: TRNSYS-users Digest, Vol 76, Issue 2
Dear all
In tmy2 weather data, what is the reference orientation for the angle
of the wind velocity? For example, 90 degree, does it mean east, 180
degree, means south?
Thank you very much in advance.
Cheers
fuqiao
-----邮件原件-----
发件人: trnsys-users-bounces@cae.wisc.edu
[mailto:trnsys-users-bounces@cae.wisc.edu]
代表 trnsys-users-request@cae.wisc.edu
发送时间: 2011年4月2日 1:00
收件人: trnsys-users@cae.wisc.edu
主题: TRNSYS-users Digest, Vol 76, Issue 2
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Betreff:
[TRNSYS-users] chiller performance with type 42?
Von:
Cramer Silkworth <silkworth@transsolar.com>
Datum:
Mon, 4 Apr 2011 22:32:32 +0200
An:
trnsys-users@cae.wisc.edu
An:
trnsys-users@cae.wisc.edu
Hi All,
I have performance data for a chiller from the manufacturer, with thermal capacity and electrical power demand for varying part load fractions, for a series of condenser water temps (60-85F, in 5F increments). Seems like I need type 42, but other than the general description in the documentation, I've no idea how to start using it. Is there a more detailed manual and/or example file?
Thanks,
Cramer
Cramer Silkworth
212 219 2255 | silkworth@transsolar.com Transsolar Inc. | 134 Spring
Street Suite 601 | New York, NY 10012
Transsolar Climate Engineering
Technical consulting for energy efficiency and environmental quality in buildings.
New York - Stuttgart - Munich
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Betreff:
[TRNSYS-users] TRNSYS models for longwave radiation exchange within a
zone
Von:
simge andolsun <simgeandolsun@gmail.com>
Datum:
Mon, 4 Apr 2011 21:23:21 -0500
An:
trnsys-users@cae.wisc.edu
An:
trnsys-users@cae.wisc.edu
Dear TRNSYS users,
I am trying to understand the differences between the three radiation
models listed under "Longwave radiation exchange within a zone" in
"Radiation Modes of Thermal Zone" feature of TRNBuild. These models
are:
1) Standard model (starnet model)
2) Simple model (one node model with combined heat transfer coeff.)
3) Detailed model (based on view factors)
The manuals do not refer to these radiation models using the exact
names listed in TRNBuild; therefore I am feeling difficulty
understanding which of the three models is actually being discussed.
Could you please briefly explain the primary differences between the
calculations of these radiation models? I would also appreciate it
very much if you could direct me to the specific sections of the
manual (or to the related papers/thesis) that I should read to learn
more about each model.
Thanks in advance,
Best,
Simge Andolsun
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Betreff:
[TRNSYS-users] why the model couldn't converge with a fictif wall
represente direct contact
Von:
Yujun TAO <aleck1314@yahoo.fr>
Datum:
Tue, 5 Apr 2011 07:53:48 +0100 (BST)
An:
TRNSYS USERS <trnsys-users@engr.wisc.edu>
An:
TRNSYS USERS <trnsys-users@engr.wisc.edu>
Hello,
I use a fictif wall without resistance in my work to represente a
direct contact between 2 zones, the name in the model jointed here is
mur-fictive, i give a very big hi (internal heat convective heat
transfer coefficient) et he (external heat convective heat transfer
coefficient) to model a good contact, but it couldn't converge. If i give 0 to hi and he, it turns very well.
So i don't understand should give 0 to turn simulation or the wall
could not be modelized like this.
Thanks
Aleck
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