DOE-2 Reference Manual Version 2.1 - DOE2.com

7. Only one size of cooling tower can be entered per computer run. That is,the program cannot simulate the operation of a number of different sizedtowers or a single tower with different sized cells. All cells or unitsmust be the same size. Note that, for the tower, SIZE refers to the cellsize, and INSTALLED-NUMBER is the number of cells. It is recommendedthat the user allow the program to default both the SIZE andMAX-NUMBER-AVAIL for the cooling towers.8. Utilities are never specified by a PLANT-EQUIPMENT instruction, but theyare referred to by the LOAD-ASSIGNMENT instruction. Economic data arespecified by the ENERGY-COST instruction.9. Purchased steam and purchased chilled water are disallowed unless thekeyword UNIT in the ENERGY-COST instruction is set to a non-zero number.10. The electric utility is assumed to be allowed unless UNIT in theENERGY-COST instruction is set to zero.11. If both an electric and a fossil-fuel boiler are to be available, aLOAD-ASSIGNMENT instruction must specify their operation. Otherwise, theprogram assumes that only the fossil-fuel boiler is available.12. FURNACE, DHW-HEATER, and ELEC-DHW-HEATER cannot be entered in LOAD­ASSIGNMENTs. If a furnace is specified, all the space heating load isassumed to go to the furnace. If a DHW-HEATER is specified, all hotwater load, domestic and process hot water (specified in LOADS) areassumed to go to the DHW-HEATER. If MAX-NUMBER-AVAIL is greater than 1,all the units of the FURNACE and/or the DHW-HEATER and ELEC-DHW-HEATERare assumed to run simultaneously.Note: To zero out the cost of a piece of equipment, the user shouldassign small, non-zero values, as follows:FIRST-COST = 0.001CONSUMABLES = 0.001MAINTENANCE = 0.001MINOR-OVHL-COST = 0.001MAJOR-OVHL-COST = 0.001(If zero values are assigned, the program will calculate cost based onequipment size.)V.16 (Revised 5/81)