DOE-2 Reference Manual Version 2.1 - DOE2.com

The primary purpose of the plant is to supply the building with heating,cooling, and electricity. Heating may be obtained from a steam utility,boiler, a furnace, a double-bundle chiller, solar collectors, heat recoveredfrom diesel and gas turbine generators, and stored heat as well as hot waterheating; cooling from cold water tanks, compression chillers, reciprocatingchillers, absorption chillers, double-bundle chillers or utility chilledwater; electricity from the utility or from diesel, gas, or steam turbines.The user selects the types of equipment that are to satisfy the loads.Each piece of plant equipment may be supplied with energy in usable formfrom one or more sources. The boiler is supplied with fuel and/or electricity.Compression chillers may be supplied with electricity from the utilityand/or on-site generator(s). Absorption chillers may be supplied with heatfrom (1) the steam utility, (2) solar collectors, (3) a boiler, (4) electricity,and/or (5) waste heat. The waste heat may be recovered from diesel andgas turbines, and possibly, with a small amount of heat recovered from blowdown.Diesel and gas turbines may be supplied with fuel, steam turbines withsteam from the steam utility, a boiler, and/or waste heat from diesel and/orgas turbines. Cooling towers receive electricity from the utility and/oron-site generator(s), and the hot-water storage tank is provided with heatfrom a boiler or waste heat from a recoverable source.Figure V. 1 shows the plant energy flow described above. Heat recoverycan occur if the user specifies equipment that can supply and use recoveredheat. Heat recovery can take place at five different temperature levels,Levell being the highest. Details about heat recovery equipment or processesand the flow of energy are shown in Tables V.g, V.10, and V.11 in Sec. B ofthis chapter.4. Suggested Sequence of PLANT Program InputFor the PLANT program to run, there must be more RUN-PERIOD intervalsthan DESIGN-DAY instructions entered in the LOADS input (see Sec. III.B.2 andIII.B.3). The PLANT simulation will size equipment based on the worst case ofthe DESIGN-DAY or the weather tape. Energy usage will then be calculated forthe remaining RUN-PERIOD intervals.To use the PLANT program, the user must first enter anINPUT PLANT ..instruction. (The PARAMETRIC-INPUT PLANT instruction is only used forsubsequent parametric runs.) The BDL processor will expect aPLANT-EQUIPMENT ..instruction next. At least one PLANT-EQUIPMENT instruction must be entered toinform the Processor which piece of equipment is to be simulated. Thefollowing instructions may then be entered as desired or required by the user.V.5 (Revised 5/81)