DOE-2 Reference Manual Version 2.1 - DOE2.com

2. PART-LOAD-RATIOThe equipment PART-LOAD-RATIO instruction specifies the mlnlmum, maximumand preferred operating conditions for one piece of equipment, and the nominalelectric power input ratio to operate the equipment and supporting electricauxiliaries.The PART-LOAD-RATIO instruction is optional. If data entry for theinstruction is omitted, the default values shown in Table V.4 are used foreach TYPE of equipment.PART-LOAD-RATIOTYPEMIN-RATIOMAX-RATIOThis command word informs the PDL Processor that the data tofollow are related to the part load operation of a specifictype of equipment.is the code-word selected from Table V.4 that identifies thetype of equipment to which the part load ratios specified inthis instruction are applicable. Only one TYPE may bespecified per instruction.is the minimum fraction of nominal rated load at which theequipment item being specified can operate continually.That is, if the item of equipment is scheduled to operateand the demand is more than zero but less than the MIN-RATIO,the program will cycle the machine on and off. However,diesel generators and gas turbine generators will turn off,not cycle, below MIN-RATIO.Default values of MIN-RATIO for each type of equipment areshown on Table V.4.is the maximum fraction of loading or overloading allowed,if any. If the maximum load is the nominal rated load(SIZE), and no overload is allowed, the user should specify:MAX-RATIO = 1.0The default values of MAX-RATIO for each type of equipmentare shown in Table V.4.OPERATING-RATIOis the point, usually taken from a performance curve, thatrepresents the most desirable operating condition. If aLOAD-ASSIGNMENT instruction is not entered to specify thesequence of equipment operation, the program will determinethis sequence by operating the equipment as near as possibleto the OPERATING-RATIO.V.18 (Revised 5{81)