DOE-2 Reference Manual Version 2.1 - DOE2.com

ZONE-HEAT-SOURCEPREHEAT-SOURCEBASEBOARD-SOURCESIZING-RATIOInput for this keyword is the code-word that identifies theheat source for the zone heating coils in central airhandler systems (reheat coils). See Table IV.41 for theapplicable code-words, and Table IV.42 for defaults.Input for this keyword is the code-word that identifies theheat source for the preheat coils. See Table IV.41 for theapplicable code-words, and Table IV.42 for defaults.Input for this keyword is the code-word that identifies theheat source for the baseboard heaters. See Table IV.41 forthe applicable code-words, and Table IV.42 for defaults.Note: HOT-WATER/SOLAR should not be used as a code-wordfor BASEBOARD-SOURCE. ---is used to deliberately oversize or undersize all equipmentin the system. The input for this keyword is the ratio ofthe maximum capacity (or size) of the simulated system andits zones to either (1) the capacity assigned in theappropriate SOL instructions or (2) the capacity requiredto meet peak (or design day) loads calculated by theprogram. The ratio can be more than, equal to, or lessthan unity (1.00 is the default value). The SIZING-RATIOdoes not modify the heating/cooling data that are passedfrom LOADS to SYSTEMS. It only modifies the equipmentsizes in SYSTEMS. This modification, however, will probablychange the responsiveness of the system, either faster orslower depending upon whether the equipment is being oversizedor undersized. Likewise, the alteration of equipmentsize can change the demands, placed by the system, upon thePLANT equipment. The latter change may render the PLANTequipment inadequate in size (if assigned) or may result inexcessively large equipment. The judicious use of theSIZING-RATIO option can be a useful tool in cost tradeoffstudies.Warning: The following keyword is not to be confused with a keyword bythe same name in the ZONE command.SIZING-OPTIONRETURN-AIR-PATHaccepts a code-word as input, either COINCIDENT, meaningblock or building peak load, or NON-COINCIDENT, meaning thesum of the individual zone peak loads. Depending on theentered code-word, the SUPPLY-CFM will be sized by thecoincident or the non-coincident peak (see SUPPLY-CFMkeyword in the SYSTEM-AIR instruction). For COINCIDENTsizing there must be only one SYSTEM in the PLANT-ASSIGNMENTcommand and MIN-FAN-RATIO must be less than 1.0.Input for this keyword is the code-word that describes theroute that return air takes in getting back to the airhandling unit. See Table IV.43 for the code-words and abrief description of how the program responds to each.This entry may be omitted if air returns to the air handlingunit without absorbing any plenum or light heat (code-wordDIRECT is default value).IV.262 (Revised 5/81)