[Bldg-sim] adiabatic cooling

[Nick Caton]

Hi Harakhlaal, 

 

I'm not sure whether I can provide any clear answers, but I am quite
curious to see the answer to your question.

 

I recall discussing adiabatic heating/cooling in my thermodynamics
courses... it's basically the concept of raising/lowering temperatures
without adding or removing heat, but instead rather through changes in
fluid volume/pressure, right?  A real-world example of something akin to
this might be a spraypaint can getting cold as you release its
pressurized contents.

 

If that's the case, I'm struggling to understand why you might wish to
model such behavior within a building energy simulation... kinda sounds
hazardous to the health of the occupants =)!  

 

Would you please describe your purpose a bit further?  Is there a
specific system/situation you are trying to model?  This may help others
help you determine a more appropriate tool-of-choice.  As a guess, are
you possibly trying to account for cooling in a space due to a
pressurized tank undergoing adiabatic cooling as it releases gas into
another system?

 

Back to fundamentals, and something I'd like to ask of those more
knowledgeable... I know for certain in DOE2.2/eQuest you can set up a
space with a set volume and with adiabatic (or no) surfaces - which will
account for preventing heat transfer, but I have not been exposed to
DOE2.2/eQuest varying the space pressure/volume over time, so I would
concur that this might not be possible in a literal sense... is this the
case?

 

~Nick  

 

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Vikram Sami
Sent: Thursday, March 25, 2010 12:22 PM
To: bldg-sim at lists.onebuilding.org; Harakhlaal
Subject: Re: [Bldg-sim] adiabatic cooling

 

When you say adiabatic cooling are you talking about evaporative cooling
or something else?

--- On Thu, 3/25/10, Harakhlaal <harakhlaal at gmail.com> wrote:


From: Harakhlaal <harakhlaal at gmail.com>
Subject: [Bldg-sim] adiabatic cooling
To: bldg-sim at lists.onebuilding.org
Date: Thursday, March 25, 2010, 9:00 AM


ADIABATIC COOLING

Seems to me there is no way to simulate adiabatic cooling in eQuest.

Maybe I need to use EnergyPlus or TRNSYS for this purpose.

Perhaps someone knows otherwise.


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