DOE-2 Reference Manual Version 2.1 - DOE2.com

success ive hour. Th is temperature is controlled via the input forCOOL-TEMP-SCH and THROTTLING-RANGE in the control ZONE. At calculated ZONEtemperatures above the cooling THROTTLING-RANGE, the cooling supply air isdel ivered at MIN-SUPPLY-T. As the ZONE temperature drops from the top to thebottom of the cooling THROTTLING-RANGE, the cooling coil temperature riseslinearly such that at the bottom of the range the coil is completely off(passing mixed air).Similarly for the heating mode, the supply air temperature is controlledvia the input for HEAT-TEMP-SCH in the control ZONE. Within the subZONEs, thehot air stream temperature may be modified upward by zone (reheat) coilslocated in the supply air ducts. If the user does not want a reheat coil in aparticular subZONE, he should not specify a HEAT-TEMP-SCH for that subZONE.The output of the reheat coil is controlled by the user input for the keywordsHEAT-TEMP-SCH and REHEAT-DELTA-T in the subZONE.If the calculated control ZONE temperature is in the dead band, the airis neither heated nor cooled at the SYSTEM level. If the calculated subZONEtemperature is above the heating THROTTLING-RANGE, no reheating is done.Procedure:(1) Specify SYSTEM-TYPE = SZRH or PSZ in the SYSTEM command.(2) Determine which ZONE in the SYSTEM is the control ZONE, according tothe criterion specified earlier. Specify that ZONE U-name as thefirst U-name in the ZONE-NAMES list.(3) Specify COOL-TEMP-SCH in the ZONE-CONTROL subcommand (and an associatedSCHEDULE) with hourly values of desired ZONE temperature forcooling in the control ZONE. These ZONE temperatures will be usedto modulate the cold deck temperature, at the SYSTEM level, tosatisfy the cool ing load of the control ZONE. If the user does notspecify a COOL-TEMP-SCH for the control ZONE, it will not be cooled.The temperature of the cooling air supplied to the subZONEs is alwaysdetermined by the control ZONE.(4) Specify a value for REHEAT-DELTA-T in the SYSTEM-TERMINAL subcommand.This indicates to the program that zone (reheat) coils are to be usedin the sub ZONEs and it also indicates the maximum increase in temperatureof the supply air passing over the zone coils.(5) Specify HEAT-TEMP-SCH in the ZONE-CONTROL subcommand and an associatedSCHEDULE with hourly values of desired ZONE temperature forheating in the control ZONE. Specify a HEAT-TEMP-SCH for eachsubZONE that is to have reheating. These latter ZONE temperatureswill be used to modulate the output of the subZONE reheat coils.(6) Specify THERMOSTAT-TYPE = PROPORTIONAL (or allow it to default) inthe ZONE-CONTROL subcommand for the control ZONE and any subZONEthat has reheating.I V.134 (Revised 5/81)