RE: constant temperature unwanted

[Arie Kalkman <a.kalkman@xxxxxxx>]

Dear Arko,

You cannot create an input for ventilation mass flow, but you can create an input for ventilation 
volume flow.

Click on the "arrow" next to "airchange of ventilation". In the next window, select the "input" 
radio button which allows you to create an Input parameter.

The dimension of airchange is in /hour, but since your room will have a fixed volume V, one
airchange per hour equals a volumeflow of V per hour.

Kind regards,

Arie



-----Oorspronkelijk bericht-----
Van:	hgjh kgkgf [SMTP:arkokaffee@yahoo.com]
Verzonden:	donderdag 12 september 2002 5:50
Aan:	trnsys@relay.doit.wisc.edu
Onderwerp:	Re: constant temperature unwanted

Thank you very muich for your help, 
But there is one think what I do not understand. I
have already made a system externaly in Iisibat. Right
now, I connect this to an Input for the temperatur of
Ventilation. The connect it with the cooling/heating
type in Prebid, I could just use an Input for limited
power at type 56 by the typicalformula: Q=m*c*/Ti-To/

I would like to turn of the heating and cooling mode
in prebid, but what inputs should I use instead? I did
not found one for an airmassflow.

What if I got an radiation system? I should connect
the massflow to some selfmade Input in Prebid, but I
do not know where. I can not just produce an Input for
massflow. It should be jused on some place in prebid.
Or am I wrong?

Hope to hear from you again. Thank you so much foryour
help!
Arko



--- David Bradley <bradley@tess-inc.com> wrote:
> Dear Arko,
>    Type56 and most of the other building models are
> set up to allow 
> simulation of two different things. First, you can
> obtain the building 
> loads - meaning that TRNSYS computes the amount of
> energy that must be 
> added to or removed from a space in order to
> maintain a set point 
> temperature. As soon as you define a setpoint, the
> building models will not 
> allow the zone temperatures to go above (in the case
> of a cooling setpoint) 
> or below (in the case of heating) that point.
> Instead, they will report how 
> much energy was required to maintain that
> temperature. Essentially you are 
> defining some ideal heating and cooling equipment
> for the building. The 
> zone temperature will float between the two
> setpoints. If you want the 
> building temperature to float without bounds, then
> you can either make the 
> setpoints very high for cooling and very low for
> heating (insuring that the 
> equipment will never turn on) or, you can turn off
> heating and cooling in 
> Prebid and define your system externally.
> Cheers,
>    David
> 
> At 06:39 AM 9/9/2002 -0700, you wrote:
> 
> >Dear Trnsys users,
> >
> >I try to simulate an air heating and cooling system
> in a building. (Type 
> >56) It has good u-values and 4 Zones. Convective
> Part of heating system is 
> >100%.
> >
> >I made an Input for the set point (20 Wintertime,
> 26 Summertime) of the 
> >Zone temperature and connected it to Equation/Type
> 14. What I do not 
> >understand is, that the temperature in this
> building is exact on the 
> >desired setpoint temperature. Usually it should not
> be that, because walls 
> >store energy and the dead Band is 2 Kelvin. Why is
> there no thermal 
> >behavior of that building?
> >
> >Thank you for consideration, I hope to hear from
> anybody soon.
> >
> >Arko K
> >
> >PS
> >
> >Also, I would like to know which Type is the best
> for a simulation of a 
> >PAC-unit.
> >
> >
> >
> >Do You Yahoo!?
>
><http://rd.yahoo.com/finance/mailsig/new/*http://finance.yahoo.com>Yahoo!
> 
> >Finance - Get real-time stock quotes
> 
>
*********************************************************************************
> 
> 
> Thermal Energy System Specialists (TESS)
> David BRADLEY                           2916
> Marketplace Drive - Suite 104
> Project Engineer                           Madison,
> WI 53719
> Phone: (608) 274-2577 USA
> Fax: (608) 278-1475
> E-mail: bradley@tess-inc.com
> Web Page:          www.tess-inc.com
> 
> "Providing software solutions for today's energy
> engineering projects"
>
****************************************************************************
> 
> *****
> 


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