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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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DBUN-UNL-RAT-DESDBUN-UNL-RAT-RECis the minimum part load ratio at which the chiller canoperate without hot gas bypass when in thenon-heat-recovery mode.is the minimum part load ratio at which the chiller canoperate without hot gas bypass when in the heat recoverymode.Cooling TowerMIN-TWR-WTR-TRFACT-CFM-EXPONENTspecifies the mlnlmum temperature for leaving towercooling water. If the temperature falls below thisminimum operating temperature, control action isinitiated to maintain at least this temperature.is the exponent used to modify the tower rating factorfor off-design airflows as shown in the followingequat ion.TWR-CELL-MAX-GPMTWR-DESIGN-WETBULBTWR-FAN-CONTROLTWR-FAN-LOW-CFMTWR-FAN-LOW-ELECTWR-FAN-OFF-CFMTWR-IMPELLER-EFFTWR-MOTOR-EFFTWR-PUMP-HEAD( . *[deS i gn cfm] nRating Factor = Ratlng Factor )desi gn-cfm actual cfmwhere n is given by RFACT-CFM-EXPONENT.specifies the ratio of the maximum water flow per towercell to the design water flow per cell.is the wet-bulb temperature used in the cooling towerdesign calculations.accepts a code-word that specifies whether the tower fanis ONE-SPEED (the default) or TWO-SPEED.specifies the air flow rate through the tower when thefans are on low speed, divided by the flow rate at highspeed. This keyword is used only when TWR-FAN-CONTROL isset to TWO-SPEED.specifies the ratio of the power consumed by the fans atlow speed to the power consumed at high speed. Thiskeyword is used only when TWR-FAN-CONTROL is set toTWO-SPEED.is the air flow rate through the tower when the fans areoff. That is, this is the flow rate caused by naturalconvection, divided by the design air flow rate.specifies the efficiency for the tower circulation pump.specifies the efficiency of the tower pump motor.is the pressure head in the tower water circulation loop.V.28 (Revised 5/81)

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