[esp-r] Re: adjustment of specific heat capacity of air to model effect of furniture

[Leen Peeters]

Ok, some further searching in the code gave me this (which is in esrubld/mstmsc, line 394 and following)

C *********************************************************************
C CPair01 calculates the specific heat capacity of dry air (J/kg K)
C as a function of temperature ( C ) (Marieke 1994, Ham 1984)
C *********************************************************************
      FUNCTION CPair01(TC)
      COMMON/OUTIN/IUOUT,IUIN

      CPair01=1006.0+TC/200.0+TC*TC/7.5E3
      IF(CPair01.LT.0.0)then
        call edisp(iuout,'CPair01: negative specific heat capacity.')
        call epwait
        call epagend
        STOP
      endif
      RETURN
      END


But then remains ... with what factor to adapt it?

________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Leen Peeters [Leen.Peeters at mech.kuleuven.be]
Sent: 24 February 2009 19:27
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] adjustment of specific heat capacity of air to model effect of furniture

Dear all,

I was checking the code in order to find the exact location to adjust the heat capacity of air in order to model the effect of furniture in a zone.
Is there a standard way to do so? In BCL22 I saw it was stated as AIRCAP, but that does seem to appear in that controller only...

The ASHRAE fundamentals do not mention the topic 'furniture', I know the TRNSYS people use an increase of the air capacity with a factor 5 to 10 as a rule of thumb, but is there no general guidance for that?

Thanks!

Leen

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