[BLDG-SIM] Indirect Evaporative Cooling

[Matt Gangemi]

Hello,

I'm analyzing a building with a central plant, and would like to simulate pre-cooling the outside air using indirect evaporative
cooling, using relief air as the secondary stream.  Does anyone know how to do this with DOE2?  (I've been using 2.2, but let me
know if there's a solution in any version)

Not knowing how to simulate this exact situation, I've tried to simulate indirect evaporative cooling using outside air as the
secondary stream.  However, this gave me results that I don't believe.  Specifically, after adding evaporative cooling our increased
fan energy dwarfed any chiller savings.  Although this is possible if the climate is mild enough, in that case the demand should
still be reduced.  According to some spreadsheet calculations, we should save ~40kW in demand from the reduction in chiller size,
and gain ~10kW in fans.  However, in the simulation results the demand increases by ~200 kW.

Here are the commands I had  added:
   EVAP-CL-TYPE     = INDIRECT
   EVAP-CL+M-SUP    = TOGETHER
   EVAP-CL+REC-RA   = YES

Does anyone know of oddities in modeling indirect evaporation that I should know about?

Thanks,
-Matt Gangemi
 GeoPraxis

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