DOE-2 Reference Manual Version 2.1 - DOE2.com

MAX-HUMIDITYis the highest allowable relative humidity (R.H.) in thezone, or zones, served by the system. Because the programcalculates the relative humidity in the return air,dehumidification is based on the average humidity condicionfor all the zones served by the system, as weighted by therelative return air flow rate from each zone. This dataentry should be used only for those systems that have thecomponents required for control of excess humidity (i.e., ahumidistat and a heating coil downstream of the coolingcoil). If no data entry is made, the program will assumethat humidity control capability does not exist. The defaultvalue of 100 per cent is intended to specify no upper limiton humidity, that is, no humidity control.The program will not force the cooling coil to perform beyondits dehumidification capability. The program will not beable to hold a specified MAX-HUMIDITY if MIN-SUPPLY-T is notlow enough. Fig. IV.21 shows one type of dehumidificationcycle.Cooling andDeh u mid if ic at ion ---.'-0,'/79toO%. RH90% RH70% RH/ //?-Return Air ConditionsFig. IV.2160· [Reheatino --':::,';L50/"7":-"1' ! Desired SupplyWet BulbI. .. I Air Conditions/1/ 1. ·1·/1 11 [Dry Bulb 6'0. 70· ~9.CPLy-r is not eQuol to or less thonthis temperature, MAX- HUMIDITY will be resetupwards.Relationship of MAX-HUMIDITY to MIN-SUPPLY-T.If a lower MAX-HUMIDITY is required to meet desired spaceconditions, a lower MIN-SUPPLY-T should be entered.MIN-HUMIDITYis the lowest allowable relative humidity (R.H.) in the zone,or zones, served by the system. This data entry should beused only for those systems that have the components requiredfor minimum humidity control (i .e., humidistat andhumidifier). The user should not set ~lIN-HUMIDITY so highI V. 208 (Revised 5/81)