[esp-r] Re: question on "modelling Passive downdraught evaporative cooling (PDEC) with ESP-r"

[Georgios KOKOGIANNAKIS]

Many thanks Jon for your quick response.
I think that the "evaporative surface" is probably the best current approach for modelling this. It does not seem difficult either to implement as a special material what that paper was describing (at least for the temperature part - not sure about the air flows). We may do that over the summer.
I will let you know on how this progresses.

Thanks again,
Georgios


-----Original Message-----
From: Jon Hand [mailto:jon at esru.strath.ac.uk] 
Sent: Sunday, February 28, 2010 2:39 PM
To: Georgios KOKOGIANNAKIS; esp-r at lists.strath.ac.uk
Subject: RE: [esp-r] question on "modelling Passive downdraught evaporative cooling (PDEC) with ESP-r"


If the PDEC is primarily driven by the wet pad it would be useful to consider a variant of the
wet surface controller or how about an evaporative surface as a special material.

If you have a good idea about the amount of cool air generated you might making a zone to
represent the air near where the pad would be and chilling it an equivalent amount.
Buoyancy in the flow network could take care of the rest.

Is the idea below to raise the humidity of the air stream via the humidity control?

Anyone interested in implementing a wet pad representation?

-Jon Hand
________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Georgios KOKOGIANNAKIS [Georgios.KOKOGIANNAKIS at nottingham.edu.cn]
Sent: 28 February 2010 05:24
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] question on "modelling Passive downdraught evaporative cooling (PDEC) with ESP-r"

Hi all,

I am wondering what would be the best approach for modelling Passive downdraught evaporative cooling (PDEC) with ESP-r, and in particular a a PDEC tower with a wet pad?

I am thinking of modelling the tower as a separate zone, set up an air flow network and use the ideal humidity control in the PDEC tower zone. Would this approach be OK and what are the limitations?
There is an existing implementation of a PDEC tower component in another building simulation program (which is described in this IBPSA 2009 paper: http://www.ibpsa.org//proceedings/BS2009/BS09_0369_376.pdf) but we would ideally like to use ESP-r for other reasons, i.e. we need to try and set up a CFD simulation for the zone that the incoming air is dumped. Do you think that I should use ESP-r for this model?

Thanks very much,
Georgios *******************************************************************************************************************************
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