[EnergyPlus_Support] COIL:Water:Cooling

["tonybaxterhevacomp" <tony@xxxxxxxxxxxx>]

Hello anyone,

I have set up a simple constant volume a/c system, with a chilled 
water cooling coil, with water at 7/9 degC. There is zone temperature 
control but no humidity control.  The sizing results give me an all 
sensible load of 6.5kW (ie no dehumid).  I noticed that I was 
using 'autosize' for the 'Design Outlet Air Humidity Ratio' (DOAHR)
item.  When I changed this, the coil performance, not unreasonably, 
started to change.  I cannot however figure out what is happening to 
the coil performance.

The figures for the coil, as I varied DOAHR are:

Coil DOAHR     0.002    0.004    0.006   0.008   0.010    0.012
Coil T out     18.45    16.3     17.1    16.01   18.93    21.2
Coil Hum out 0.00945  0.00828  0.00868  0.01001 0.00976  0.01001

In all cases, the coil Design Inlet Air Humidity Ratio was set 
to 'autosize'. The on-coil condition is 28.3C/0.01001
For autosized DOAHR, the off-coil condition is 16C/0.01001

Does anyone know what the 'autosize' option does with the coil 
performance and what is happening as DOAHR varies 

COIL:Water:Cooling,A3:Cool,Psched:1,autosize,autosize,autosize,autosiz
e,autosize,autosize,autosize,A3In:Cool,A3Out:Cool,A3:SinA,A3:SinB,Simp
leAnalysis,CrossFlow;


Best wishes

Tony Baxter






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