DOE-2 Reference Manual Version 2.1 - DOE2.com

00-2 DESIGN-DAY $DATA FOR SECOND ZZDESIGN-DAY $$INTERVAL $00-3 DESIGN-DAY ZDATA FOR THIRD $$AND LAST POSSIBLE $ZDESIGN-DAY $$INTERVAL $U-nameDESIGN-DAYLIKEDRYBULB-HIDRYBULB-LOHOUR-HIHOUR-LOIn the preceding example, the program will choose, for automaticequipment sizing, the largest loads (heating and cooling) based onDESIGN-DAY data rather than weather file data. If DESIGN-DAYs areinput, the SYSTEMS program will size equipment based upon theDESIGN-DAY peaks, even if they are smaller than the yearly peakscalculated from the weather file. Had the fourth RUN-PERIODinterval been omitted, automatic equipment sizing in LOADS andSYSTEMS would be based on DESIGN-DAY data only. Furthermore, thesubsequent loads in PLANT would be calculated to be zero because thePLANT simulator requires weather file data, and such data would notbe available because all of the RUN-PERIOD intervals have been used.Had the fourth RUN-PERIOD interval been the only entry (no otherintervals and no DESIGN-DAY instructions), automatic equipment sizingwould be based on weather file data only.The program attempts to account for the thermal mass of the structureand furnishings by iteratively calculating the first day of the RUN­PERIOD four times and then using the answers from the fourth iterationas the answers for the first day of the RUN-PERIOD.Bear in mind, when using this instruction, that the building externalloads will be imposed according to the DESIGN-DAY data (plus solardata) and the building internal loads will be imposed according tothe scheduled SPACE-CONDITIONS data. Therefore, if a one-dayRUN-PERIOD is chosen and that one day is a Saturday, Sunday orholiday, the internal loads may never be imposed in the calculations.is optional for this instruction.This command tells LOADS that the data to follow specifydesign-day-related variables.may be used to copy data from a previously U-namedDESIGN-DAY instruction.is the maximum ambient dry-bulb temperature (OF).is the minimum ambient dry-bulb temperature (OF).is the hour during which DRYBULB-HI occurs.is the hour during which DRYBULB-LO occurs.111.26 (Revised 5/81)