[esp-r] Re: Night-time ventilation

[Matthew Wright]

Hi Achim, Jon (and all),

I have successfully modelled using air-flow networks, as I am interested in
overheating in residential (and therefore often natural airflow) situations.

However, I have two questions

1) When modelling air permeability in such a way that I could relate it to
real world pressurisation (q50) tests, I used a set of external wall
'cracks', which linked to the air flow network. Is there an easier way of
doing this?
2) If I wish to model an MVHR unit, is there a plant option or air network
option that I could use? If one doesn't exist, how do I go about creating
it? 
For example, would the model work if I physical recreated the heat exchanger
as two zones with a thin wall between, etc?

Any indication of where to look for helpful examples or 'buttons to push'
would be good.

Regards
 
Matt
 


-----Original Message-----
From: esp-r-bounces at lists.strath.ac.uk
[mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Achim Geissler
Sent: 17 June 2013 18:12
To: Archontiki, M.
Cc: esp-r at lists.strath.ac.uk
Subject: [esp-r] Re: Night-time ventilation

Dear Maria

there are four methods for ventilation simulation in ESP-r:
a) via operations file, use "infiltration" for night time ventilation (note
that "ventilation" in the operations files means "between zones", not
to/from the ambient),
b) by AIM ("air infiltration model" - I don't know anything about this, as I
have never used it),
c) via an external data file "tdf" and
d) via an air flow network.

The latter is the most sophisticated and takes the most "setting up" work
(and likely the most knowledge of "what you are doing") - if your study is
really focussing on night time ventilation, then this may be the best bet -
you can open and close windows and doors via control, the actual air
movement is calculated based on temperature differences (stack) and wind
velocities. 

"a)" is quickly set up (by schedule in "operations file" menu") but has the
significant drawback that the air changes are fixed by you and need not have
any bearing on actual flows possible at any given time. "c)" is in effect a
variant of "a)", however you can use smaller time steps ("a)" allows only
hourly changing values). You could also use measurement values, with "c)".

Hope that helps a bit.

Regards
Achim


On Jun 17, 2013, at 6:01 PM, "Archontiki, M." <m.archontiki at student.tue.nl>
wrote:

> Dear all,
> 
> Could please somebody give me a hint on how to import night time
ventilation during cooling period? I have defined the infiltration and
ventilation flow values for certain periods and I would like to have
increased flow rates during non occupied hours, in the cooling months. I
show the thermostatic control option but it applies to all day types and
periods. Thank you in advance.
> 
> Kind Regards,
> Maria Archontiki
> 
> _______________________________________________
> esp-r mailing list
> esp-r at lists.strath.ac.uk
> http://lists.strath.ac.uk/mailman/listinfo/esp-r
> 

achim.geissler at intergga.ch





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