DOE-2 Reference Manual Version 2.1 - DOE2.com

The heat from the supply air fan is added, by default, to the primary airdownstream of the cooling coil, unless the user specifies FAN-PLACEMENT =BLOW-THROUGH. The effect of the humidifier, if specified, is added to themixed air stream.This system type is normally used for interior zones only.are no reheat coils, although baseboards are sometimes used.Often, thereExample:Variable Volume Cool ing Into the Induction Box / Constant Volume Heatingwith User controlled Cold Deck Temperatures for SZCI(with COOL-CONTROL - SCHEDULED)The cooling is accomplished by a variable air volume flow, in the supplyair duct up to the ZONE induction box. The temperature of the cold air stream(cooling coil temperature) is set each hour by the user in a SCHEOULE. Theprocess of blending the cooling air with induced air, in the induction box, iscontrolled at the ZONE level with the keyword COOL-TEMP-SCH.At calculated ZONE temperatures above the cooling THROTTLING-RANGE, thecooling air flow rate into the induction box is at the maximum, the ZONEdesign cooling flow rate (100 per cent cooling air and no induced air). Asthe calculated ZONE temperature drops from the top to the bottom of thecooling THROTTLING-RANGE, the cooling air flow rate into the induction boxdecreases linearly from the maximum of 100 per cent to 50 per cent of the ZONEdesign cooling flow rate, while simultaneously the induced air flow rate intothe induction box increases linearly from zero to 50 per cent. This producesa constant volume flow, of variable temperature, out of the induction boxinto the ZONE. As the calculated ZONE temperature drops across the deadband,the air flow into the ZONE is 50 per cent induced air and 50 per cent coolingair (or mixed outside and return air, if the cooling has been turned off).At all calculated ZONE temperatures from the top to the bottom of theheating THROTTLING-RANGE, the air flow into the ZONE is 50 per cent inducedair and 50 per cent cooling air (or mixed outside and return air, if thecool ing has been turned off). As the calculated ZONE temperature drops fromthe top to the bottom of the heating THROTTLING-RANGE, the heating output ofthe zone coil s increases 1 inear ly for zero to maximum.Procedure:(1) Specify SYSTEM-TYPE = SZCI in the SYSTEM command.(2) Specify COOL-CONTROL in the SYSTEM-CONTROL subcommand equal toSCHEDULED. This establishes the method for setting the temperatureof the supply air that will be sent to all ZONE induction boxes inthe SYSTEM. If the user does not specify a value for COOL-CONTROL,it will default to CONSTANT and COOL-SET-T will default toMIN-SUPPL Y-T.I V.162 (Revised 5/81)