DOE-2 Reference Manual Version 2.1 - DOE2.com

THROTTLING-RANGE. The cooling set point (with its THROTTLING-RANGE) is movedupward and the heating set point (with its THROTTLING-RANGE) is moved downward,both by equal amounts (one-half of the overlap).Example:User-SpecifiedOverlapping RangesTHROTTLING-RANGE : 4Cooling Set Point - 70Heating Set Point - 68OOE-2Adjusted RangesTHROTTLING-RANGE : 4Cooling Set Point - 71Heating Set Point - 67If the system being modeled has no controls corresponding to one of thetwo control bands, the corresponding temperature schedule need not be entered.Thus, for example, if a system has no capability for cooling, such as a unitheater (SYSTEM-TYPE: UHT), it is not necessary to specify COOL-TEMP-SCH;specify only HEAT-TEMP-SCH.As the calculated ZONE temperature rises and falls within theTHROTTLING-RANGEs, different actions are simulated. No changes in simulationactions take place outside of the THROTTLING-RANGEs. The exact actlons thattake place depend on the SYSTEM-TYPE and keyword values that are specified.Subsections b. thru j. discuss these actions by SYSTEM-TYPE and controlstrategy. Selected example strategies are given, but it is not possible todiscuss all the possible strategies for each SYSTEM-TYPE. Table IV.25summarizes, by SYSTEM-TYPE, the possible actions that can be obtained usingthe specification of values for COOL-TEMP-SCH and HEAT-TEMP-SCH (the coolingand heating set points).The user may argue that most SYSTEMs have only one thermostat set pointand THROTTLING-RANGE, not two. At anyone time that is true, because only oneset point and THROTTLING-RANGE are active. Herein lies one of the slightdifferences between simulation methodology and the "real world of hardware".The heating set point and THROTTLING-RANGE control the heating equipment. Thecooling set point and THROTTLING-RANGE control the cooling equipment. Theheatlng equipment and cooling equipment are two separate sets of equipment,normally operating with different actions. The user should determine how manyset points, one or two, are required for his SYSTEM-TYPE, by referring to theappropriate Applicability Table or to Table IV.25. To obtain a propers imu 1 ati on, when the control strategy requires two set po i nts, the user mustspecify two set points. Strategies that involve only one set point requirethat only that set point be specified. If the user specifies two set points,when only one is required, only the proper set point will be used by theprogram. If in doubt, specify both COOL-TEMP-SCH and HEAT-TEMP-SCH.The user should be aware that if he specifies the cooling set point to beequal to the heating set point (on the insistence that there is really onlyone set point), several things may happen. First, the set points will beIV.I07 (Revised 5/81)