[TRNSYS-users] Changing properties of air in a single room?

[Alasdair Douglas]

Hi David,

 

Thanks for the suggestion. I had a look at the tank models but they
don't seem to quite do what we require. In particular we are looking at
a box type shape that we could apply different temperatures to the
various walls as they would border different spaces. Our thinking was to
model the tank as a room but change the capacitance of the room to
represent a different fluid from air, turn off any infiltration etc so
that it is essentially a sealed box. Then place rooms on each of the
sides of the tanks so that it is completely surrounded. These rooms
would then be incident to the outside and a weather file used to
determine the various parameters on the outer walls. This determines the
temperature of these spaces which will then influence the tank at the
centre; we then need to calculate the required heating / cooling to keep
the central tank (room) at a constant temperature.

 

So really is it possible to change the properties of the air in a room?
I see that it is possible to change the capacitance? And does this
approach sound sensible?

 

Thanks again,

 

Aly

 

________________________________

From: David Bradley [mailto:bradley at tess-inc.com] 
Sent: 20 September 2010 16:24
To: Alasdair Douglas
Cc: trnsys-users at cae.wisc.edu
Subject: Re: [TRNSYS-users] Changing properties of air in a single room?

 

Alasdair,
 I would recommend using an actual tank model; there are three
vertically cylindrical tank models in the TRNSYS standard library, one
of which allows the volume of liquid in the tank to vary with time.
There are horizontally and vertically cylindrical, spherical, and
rectangular models in the TESS Library. It is a bit harder to deal with
open tanks; the best bet there might be to look at using the Transsolar
pool model although it neglects energy loss from the sides of the pool.
regards,
 david

On 9/20/2010 03:50, Alasdair Douglas wrote: 

Dear All,

 

We are looking in to a project for which we need to model tanks of
liquid (probably oil) within a space and calculate the heating required
to keep the oil at a set temperature. Would it be possible to model this
tank as a room? Is there a way that the properties of the air in a room
could be changed to that of oil while any surrounding spaces would have
normal air properties? Or do you think a more simplistic model would be
more appropriate?

 

Thanks in advance,

 

Aly

 

 
 
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