DOE-2 Reference Manual Version 2.1 - DOE2.com

REPORT LS-C - BUILDING PEAK LOAD COMPONENTSThe following report is similar in format to the preceding report(LS-B). The major difference is that this report is generated at the"building level," that is, all space loads are summed algebraically.The building coincident peak load does not include plenums or otherunconditioned spaces. Although no infiltration is indicated for the peakcooling load for the Example Building, the user should realize how DOE-2treats infiltration loads. The sensible portion is treated as aninstantaneous heat gain or loss. The latent portion is reported in LOADS,but is passed to SYSTEMS as a CFM with the calculated humidity ratio for eachhour. The contribution of the latent heat (negative or positive in relationto room humidity) is then calculated as a mass balance of moisture in thespace, to determine the return air humidity ratio. In dry climates theinfiltration may actually result in a decreased space latent load and thus adeCreased total SYSTEMS load. The opposite is true in humid climates whereinfiltration acts to increase the SYSTEMS load.The heat gain or loss that occurs in plenums, including heat due tolights, is accounted for in the SYSTEMS simulation, causing a temperaturedifference of the return air flowing through the plenum. Therefore the usershould not specify plenums unless they are actually return air plenums.UncondiflOned, non-return air spaces should be specified in the SPACE commandwith ZONE-TYPE = UNCONDITIONED.VII.40