[esp-r] Re: air flow network

[Arianna Sdei]

Sorry folks, 

It seems like I was making a small calculation mistake in reading the number of zeros before the constant for the crack. So I have corrected that and the result seems more similar to what I was expecting. Thank you very much for your suggestions and support, I will keep you informed about future modelling challenges. 

Best,

Arianna 

-----Original Message-----
From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of apinto at lnec.pt
Sent: 28 November 2013 20:06
To: Achim Geissler
Cc: esp-r at lists.strath.ac.uk Club
Subject: [esp-r] Re: air flow network

Hi,

For each facade are you using something like:
a= ACH50 x VOL/(50^0.66)/3600/Sum(Afacade) x Afacade i ?

To refine the calculation, in each façade you should split “a” for an upper and lower part.

Best
Armando

> Hi Arianna,
>
> could you give an example with numbers and units for your substitution 
> procedure? What was the ACH at 50 Pa result from the measurement? Do you 
> have consumption data from the obviously existing building? What are 
> the dimensions of the single storey house? At 100 m2 heated area you 
> would end up with 300 kWh/(m2 a) which is a lot but not totally 
> impossible depending on climate, window sizes, insulation standard and leakiness.
>
> Sorry to ask so many questions.
>
> Best
> Achim
>
>
> On Nov 28, 2013, at 8:37 PM, Arianna Sdei <A.Sdei at brighton.ac.uk> wrote:
>
>> Dear ESP-r community,
>>
>> I am trying to set up an air flow network using the measured air flow 
>> rate from pressure tests. To do that I am substituting power law flow 
>> components to cracks. I have calculated the coefficient a in the 
>> equation : Q = a dP ^b using the measured ACH and I am using b=0.66 
>> but when simulating I get a too high heating load (over 30000 
>> kWh/year for a single storey house) . Does anybody know why this 
>> happens and if there is another way to use the measured ACH from the 
>> pressure tests to set up the infiltration rate using an air flow 
>> network? Thank you
>>
>> Regards,
>>
>> Arianna
>>
>> Arianna Sdei
>>
>> Research Fellow IFORE (Innovation For Renewal)
>>
>> UNIVERSITY OF BRIGHTON
>>
>> Moulsecoomb, Lewes Road, Brighton, BN2 4AT
>>
>> direct line: 0044 (0)2036747268
>>
>> mobile: 0044 (0)7981739024
>>
>>
>>
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> achim.geissler at intergga.ch
>
>
>
>
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