Re: [TRNSYS-users] Question: split unit air condition & type756

[David Bradley <bradley@tess-inc.com>]

Dear Aristotelis,
  The assumption in Type756 is that the indoor and outdoor blowers are 
either both ON or both OFF. The Type reads total power draw from the 
external data file (based on the flow rate input) and subtracts off the 
specified blower power and controller power (parameters) so that it may 
report compressor power as an output. Because Type756 does not set the 
indoor unit flow rate, you need to include a fan model that does set the 
indoor (evaporator) flow rate. If all you care about is the total power 
draw, you can set the power draw of the fan model to 0 and use only output 
8 of Type756, which would include controller, indoor blower, outdoor 
blower, and compressor power).
Kind regards,
 David


At 08:06 9/19/2006, Aristotelis Avgelis wrote:
> Dear all,
>
> I 'm using TRNSYS 16 simulation Studio and I sould like to put in my
> building a split unit air condition system (wall-mounted),
> that means that I have an indoor and an outdoor unit.  I tried to use
> type 756 but it has only one parameter for the blower
> power draw. Which one is it? I have an outdoor blower and an indoor
> blower. In a sample of TESS (type756.tpf) before the type756,
> they have connected an extra blower. It seems that it's the indoor
> blower. This means that the blower in type756 is the blower
> of the outdoor unit?  However,  the external  file with  the  efficiency
> data  of the manufacturer's device seems to include total power
> in fuction with the indoor air flow rate. I'm a bit confused.
> Is it better to use type 665, although I am interesting only for cooling
> operation?
>
> With regards,
> Aristotelis Avgelis
>
> --
> Avgelis Aristotelis
> Dipl. Mechanical Engineer
> Laboratory of Heat Transfer and
> Environmental Engineering
> Aristotle University Thessaloniki
> Box 483 54124 Thessaloniki, GREECE
> Tel: + 30 2310 996011
> Fax: + 30 2310 996012
> e-mail: aavgelis@aix.meng.auth.gr
> URL: http://aix.meng.auth.gr
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users@engr.wisc.edu
> https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

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