DOE-2 Reference Manual Version 2.1 - DOE2.com

If the user enters (1), only waste heat is supplied to the tank; a (0)entry signifies that no storage is to be accomplished.5. Whenever the hot water storage tank is being charged, that is consideredby the program to be a heating load.6. Only one hot andlor cold water storage tank may be assigned per run.7. A storage tank can never charge itself. Therefore, if a LOAD-ASSIGNMENTcalls upon a tank, the program will first check to see if part of theload is caused by the storage tank charging. If it is, that part of theload is either reduced or eliminated so that the tank will not chargeitself.8. The E-I-R (see PART-LOAD-RATIO) for a storage tank is multiplied by themaximum of HEAT-STORE-RATE or HEAT-SUPPLY-RATE for hot tanks, or themaximum of COOL-STORE-RATE or COOL-SUPPLY-RATE for cold tanks, todetermine the electric energy consumed by the storage circulating pumps.Example 1:This example will illustrate the use of a cold water storage tank.The tank, COLD-TANK, is capable of delivering 2 MBtuh of coolingwhen called upon. If the tank is not fully charged to its 10 MBtucapacity, it will be charged at night by a 7 MBtuh open centrifugalchiller, CHILLER, at the rate of 3 MBtuh. The tank is buried inthe ground (ground temperature; 58°F) and has an overall heatconductance of 200 Btu/hr-oF. The tank is used for peak shaving.$DEFINE THE COOLING EQUIPMENT$CHILLER; PLANT-EQUIPMENTTYPE ; OPEN-CENT-CHLRSIZE ; 7INSTALLED NUMBER; 1MAX-NUMBER-AVAIL ; 1COLD-TANK ; PLANT-EQUIPMENTTYPE ~ CTANK-STORAGESIZE ; 10INSTALLED-NUMBER; 1 $ONLY 1 COLD TANK ALLOWED$MAX-NUMBER-AVAIL ; 1$DEFINE STORAGE PARAMETERS$ENERGY-STORAGECOOL-STORE-RATE ; 3COOL-SUPPLY-RATE ; 2COOL-STORE-SCH ; TANK-SCH $DEFINED BELOW$CTANK-LOSS-COEF ; 200CTANK-BASE-T ; 55 $NO COOLING ALLOWED ABOVE 55F$CTANK-T-RANGE ; 12 $FULLY CHARGED AT 43 F$CTANK-ENV-T; 58 ..V.77 (Revised 5/81)