My apologies, yes a typo on my end: Ntype25,
not Ntype28. Just wanted to make sure you were aware of Ntype25. J
Kent Beason
Schlitterbahn
Development Group
830-609-8904 m
From: keilholz, werner
[mailto:werner.keilholz@cstb.fr]
Sent: Thursday, February 18, 2010
8:54 AM
To: Kent Beason
Cc: trnsys-users@cae.wisc.edu
Subject: RE: [TRNSYS-users]
Simplified heating and cooling basedonoperativetemperature
I think using NTYPE
25 is actually more precise, as it seems to use variable exchange coefficients
(the formula is in the manual 5).
I guess NType25 was
not available when we had this discussion, so I guess using it is probably
better than writing the formula (which was mainly used to show the basic idea).
Werner
De :
Kent Beason [mailto:kbeason@schlitterbahn.com]
Envoyé : jeudi 18 février
2010 15:36
À : keilholz, werner
Objet : RE: [TRNSYS-users]
Simplified heating and cooling basedonoperativetemperature
Werner,
Does this approach give a different result
than that which the NType28 provides from the Type56 outputs?
Kent Beason
Schlitterbahn
Development Group
830-609-8904 m
From: keilholz, werner
[mailto:werner.keilholz@cstb.fr]
Sent: Thursday, February 18, 2010
8:18 AM
To: Sabine Jansen - BK; Maarten
Sourbron; trnsys-users@cae.wisc.edu
Subject: Re: [TRNSYS-users]
Simplified heating and cooling basedonoperativetemperature
I once proposed to define an equation :
(using the definition from Wikipedia)
tr mean wall
temperature;
ta mean air
temperature
ts mean skin
temperature
and link it to the building as in the attached picture.
- In TRNBuild, add all
‘wall temperatures’ as outputs (yields tri, for i 1
to n walls)
- Add an equation to
compute
, then T0
Estimate v (wind speed) and ts (skin temperature)
- Connect the result
to a controller which pilots the heating in type 56 in mode « temperature level control »
But I agree it would be much nicer to have a switch in type 56 allowing
computing based on operative temperature.
I’m not at all an expert in this domain, but my expert colleagues
never contested the approach J
(except for the hint that the mean surface temperatures should also be
scaled depending on the surface area to be precise…).
Werner
De :
Sabine Jansen - BK [mailto:S.C.Jansen@tudelft.nl]
Envoyé : jeudi 18 février
2010 14:51
À : Maarten Sourbron;
trnsys-users@cae.wisc.edu
Objet : Re: [TRNSYS-users]
Simplified heating and cooling based onoperativetemperature
Dear all,
I am also interensted in that question.
The only way I know now how to solve this is by using a type
(controller, type 2 or thermostat, type 8) outside type 56. The the
operative zone temperature must be connected to this type (e.g. 2b and creating
a schedule elsewhere, in an equation solver), and the heating must be defined
as a limited power connected to an input, which is then the output of the
control type (type 2 or type 8).
One problem with this approach is that I cannot use a very
large heating power anymore, since that causes the controller to switch on and
off. Thus the heating power must be determined using the ideal heating, based
on air temperature, first.
If there is an easier way, I am also very happy.
Kind regards,
Sabine Jansen
Van:
Maarten Sourbron [mailto:Maarten.Sourbron@mech.kuleuven.be]
Verzonden: do 18-2-2010 13:53
Aan: trnsys-users@cae.wisc.edu
Onderwerp: [TRNSYS-users]
Simplified heating and cooling based on operativetemperature
Dear
all,
The simplified heating and cooling in Trnbuild is now comparing the zone
AIR temperature with the given set points. Is there a way to change
this (or another controller model) to have the zone OPERATIVE
temperature compared with the set points?
Kind regards,
Maarten Sourbron
--
Departement Werktuigkunde-Department of Mechanical Engineering
Katholieke Universiteit Leuven
Celestijnenlaan 300A bus 2421
3001 Heverlee (Leuven)
T : 0032 (0)16 32 28 73
F : 0032 (0)16 32 29 85
E : Maarten.Sourbron@mech.kuleuven.be
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users