DOE-2 Reference Manual Version 2.1 - DOE2.com

heating the air. Input for this keyword is the U-name ofa linear, quadratic, or cubic equation which describes thefraction of air (dependent variable) heated to the hotdeck temperature as a function of the ratio (independentvariable) of cfm through the cold deck to the total cfm.If the user wishes to account for this effect, a linear,quadratic, or cubic equation must be previously input tothe program and U-named in a CURVE-FIT instruction. Thereis no default value or curve.FURNACE-HIRFURNACE-AUXFURNACE-OFF-LOSSis the ratio of Btus of fuel used to Btus of heatingenergy produced. It is expressed as a number equal to orgreater than 1.0 (although the Range Maximum shown on theUser Worksheet for this command is 1.75, a number inexcess of this value will not result in an ERROR).FURNACE-HIR should include the pilot energy.When HEAT-SOURCE; GAS-FURNACE, FURNACE-AUX is the energy,expressed in Btu/hr, that is consumed by the gas pilotlight of a gas furnace during the hours when there is noload on the furnace. It is assumed by the program that thepilot light consumption during the hours that the furnaceis "on" is included in FURNACE-HIR-FPLR.When HEAT-SOURCE; OIL-FURNACE, FURNACE-AUX is the energy,expressed in Btu/hr, that is consumed by the spark ignitionand the fuel pumping system during the hours when there isa load on the furnace. The energy consumed is the furnacepart-load-ratio times the value of FURNACE-AUX in Btu/hr.The program assumes that no energy is consumed when thereis no load on the furnace.is the U-name of a linear, quadratic, or cubic equationthat describes the fraction of the unused furnace capacitythat is an induced load (dependent variable) as a functionof outdoor dry-bulb temperature. The unused furnacecapacity (HEATING-CAPACITY minus the furnace load,assuming no loss) is multiplied by this function and theresult is added to the furnace load. The loss is onlyadded during the hour the furnace operated. This loss isusually caused by infiltration induced by a non-outsideair supplied burner or off-cycle furnace cooling. Thereis no default value or curve.FURNACE-HIR-FPLR * accepts the U-name of a linear, quadratic, or cubicequation that defines the dependence of FURNACE-HIR onpart-load ratio. The equation must be input to theprogram and U-named in a CURVE-FIT instruction. Theequation should be normalized so that at full load itsval ue is 1. 0 .* Input for this keyword should be made only if the user is not satisfiedwith the default values built into the program. Additionally, if theuser decides to specify a U-name, it should not be one of the reserved"Default Curve U-names" in Table IV.39. Furthermore, these U-names areapplicable only to the SYSTEM-TYPEs stated in the table.IV.252 (Revised 5/81)