[esp-r] Re: flow components ESP-r

[Jon Hand]

A question about flow components:

The critical phrase below is 11m height.  To get a stack effect many users would
use a conduit and provide a hydraulic diameter and some (in your case) small
local loss factor and an 11m length.  You would make sure you had a bounding
wind pressure node at the top of the stack.  When linking in the component you
would be careful to assign the 'delta heights' so that the bouyancy calculation
would know there is a height difference.

And many other users would also prefer to create the stack as a thermal
zone (so there are real temperatures within the stack) and associate the
flow component with the stack zone.

Users also may have the opinion that there will be temperature differences
within the 11m stack and they will make several thermal zones as well
as flow components and link them together.

If you go with one or more zones you will then have nodes associated with
each of the stack zones and if you wanted to use a simpler opening type
as the connecting flow component you could try that out (again making
sure that the delta-height values were correct).

And you might make some alternative models to try out different approaches
and see which one seemed to work better.

Currently there is not an exemplar model about stack designs.  Perhaps
someone in the community has one that they might want to share?

-Jon Hand

-Jon Hand
________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Baharvand, E. [e.baharvand at student.tue.nl]
Sent: 21 October 2009 10:04
To: esp-r at lists.strath.ac.uk
Subject: [esp-r]  flow components ESP-r

Dear all,

I would like to raise the next question about flow components used in air flow network in ESP-r.

In my study, where for the use of AFN is required, I need to choose from the flow components types exist in ESP-r database. The list of these components one can find - among other sources - in Clark J.A. " Energy simulations in building design"  on page 132 Table 5.4.

I'm considering a rectangular (2mx0.25m) cross section area of 11 meter height in which the stack effect is predicted. Considering this application, which flow components can be considered, if:
- assuming that there is no flow frictions/resistances in this channel (because I would like to consider the channel as ideal);

Beside above, in Clark's book Table 5.4. on page 132: what means the component 'Ideal (frictionless) open' ?

Thanks in advance.

Kind regards,
Ehsan Baharvand
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