DOE-2 Reference Manual Version 2.1 - DOE2.com

where QH, QC, and QE are, respectively, the hourly heating,cooling, and electric loads transferred by the SYSTEMS program, andA, B, and C are the HEAT-MULTIPLIER, COOL-MULTIPLIER, andELEC-MULTIPLIER keywords of the LOAD-MANAGEMENT instruction.A building has a 10 Btuh open centrifugal chiller, OPEN-CENT,capable of meeting the cooling loads of the building. However, thepeak load demand charges for this facility are quite expensive, soa 10 MBtuh absorption chiller, ABSOR, is purchased to operate inlieu of the compression chiller during periods of electrical demandthat exceed 9 MBtuh. The user implements this strategy as follows:NORMAL-COOL = LOAD-ASSIGNMENTTYPE = COOLINGLOAD-RANGE = 10PLANT-EQUIPMENT = OPEN-CENTNUMBER 1PEAK-SHAVE = LOAD-ASSIGNMENTTYPE = COOLINGLOAD-RANGE = 10PLANT-EQUIPMENT = ABSORNUMBER = 1Next, the user instructs the program to operate the equipmentspecified by the LOAD-ASSIGNMENT instructions named NORMAL-COOL forpredicted electric loads of 9 MBtuh or less, and PEAK-SHAVE forpredicted electric loads greater than a 9 MBtuh.LOAD-MANAGEMENTHEAT-MULTIPLIER = 0.0COOL-MULTIPLIER = 0.333ELEC-MULTIPLIER = 1.0PRED~LOAD-RANGE = 9LOAD-ASSIGNMENT = (DEFAULT,NORMAL-COOL,DEFAULT)PRED-LOAD-RANGE = 1000LOAD-ASSIGNMENT = (DEFAULT, PEAK-SHAVE, DEFAULT)The significance of the predicted load is illustrated in thefollowing discussion:Assume that the heating, cooling, and electric loads passed fromSYSTEMS are 0.2, 8 and 4 MBtuh, respectively. Thus,Predicted Load = (0.2 x 0) + (8 x 0.333) + (4 x 1)= 6.66 MBtuh electric.Since the predicted load falls within the PRED-LOAD-RANGE = 9(i.e., 0 to 9 MBtuh), the equipment selected for operation are theheating and electric equipment defined by DEFAULT and the opencentrifugal chiller defined by NORMAL-COOL.V.62 (Revised 5/81)