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DOE-2 Reference Manual Version 2.1 - DOE2.com

DOE-2 Reference Manual Version 2.1 - DOE2.com

DOE-2 Reference Manual Version 2.1 - DOE2.com

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d. heating coil design capacitye. cooling coil total design capacityf. cooling coil sensible design capacityg. maximum and minimum coil temperaturesh. fan electrical consumption at design conditionsi. and, for central systems:1. minimum outside (ventilation) air quantity2. maximum and minimum supply air quantities3. minimum zone air quantitiesThe following required keywords will provide the least amount of informationthat the SYSTEMS design routine requires to be able to size a system:SYSTEM-TYPEZONE-NAMESDESIGN-HEAT-TDESIGN-COOL-TMAX-SUPPLY-T (except for SYSTEM-TYPE = FPH, VAVS, RHFS, CBVAV, or PVAVS)MIN-SUPPLY-T (except for SYSTEM-TYPE = UHT, UVT, FPH, or HVSYS)INDUCTION-RATIO (for SYSTEM-TYPE = TPIU or FPIU only)REHEAT-DELTA-T (for SYSTEM-TYPE = RHFS only)MAX-FLUID-T (for SYSTEM-TYPE = HP only)MIN-FLUID-T (for SYSTEM-TYPE = HP only)Obviously, design routine must know the type of system (SYSTEM-TYPE) to bemodeled and the names of the zones (ZONE-NAMES) to be included within thesystem. The next two keywords (DESIGN-HEAT-T and DESIGN-COOL-T) are definedat the zone level. They are the temperatures in the heating and coolingmodes, respectively, to which the system is to be designed. Ordinarily, theyshould be the heating and cooling set points (from HEAT-TEMP-SCH andCOOL-TEMP-SCH, respectively) during the occupied hours. The SYSTEMS designroutine does not look at schedules to determine anything. 12 general rule ~th at any i nforma ti on the user wants the des i gn routine to know about mustappear in a Keyword Value form. The schedules are utilizedonly for thesimulatlon:- ----For SYSTEM-TYPE = VAVS, RHFS, CBVAV, or PVAVS,MAX-SUPPLY-T = (MIN-SUPPLY-T) + (REHEAT-DELTA-T).The basic equation used by the design routine describes the relationshipbetween the heat addition (or extraction) rate, the air-flow rate, and thedifference between the desired zone temperature and the supply air temperature:Q = 1.08 x CFM x ~T. ( A)IV.299 (Revised 5/81)

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