DOE-2 Reference Manual Version 2.1 - DOE2.com

COOL-SH-CAPis the sensible heat removal capacity of the air coolingdevice at ARI rated conditions (the sensible part ofCOOLING-CAPACITY). At non-ARI rated conditions the valuewill be corrected by COOL-SH-FT, either by default or byuser-supplied data for COOL-SH-FT. Note: The sensiblecapacity is always less than or equal to the total capacity.COOL-SH-FT * is the U-name of a bi-linear or bi-quadratic equation that·described the sensible heat removal capacity (dependentvariable) of the air cooling device as a function of enteringwet-bulb temperature (independent variable) and outdoordry-bulb temperature (independent variable) for directexpansion. If the bi-linear or bi-quadratic being specifiedis for a Unitary Hydronic Heat Pump System (HP), the equationis describing the sensible heat removal capacity (dependentvariable) as a function of entering wet-bulb temperature(independent variable) and entering water temperature(independent variable). The bi-linear or bi-quadraticequation must be input to the program and U-named in aCURVE-FIT instruction. The equation should be normalized sothat at rated conditions its value is 1.0 (that is, where thesensible heat removal capacity equals COOL-SH-CAP). The usershould assure that the data introduced to produce this curvedoes not result in a sensible heat ratio of greater than 1.0.COOL-FT-MINis the minimum outside dry-bulb temperature for the curvesreferenced by the keywords COOL-CAP-FT, COOL-EIR-FT, andCOOL-SH-FT (and their associated CURVE-FIT instructions).This is the minimum extrapolation point. As the outsidedry-bulb temperature (one of the two independent variables ineach of the three equations) drops below this point theaccuracy of the three equations is degraded. The programassumes that the second dependent variable, in each of thethree equations, remains constant at all outside dry-bulbtemperatures below this value. The program assumes that thecorresponding cut-off wet-bulb temperature is 60°F.If the RATED-CFM (see SYSTEM-AIR or ZONE-AIR) of the supply air fan isdifferent than the SUPPLY-CFM (see SYSTEM-AIR) or ASSIGNED-CFM (see ZONE-AIR),the user may choose to enter values for the following three keywords. If,however, the user omits entries for the following three keywords, the programwill calculate their polynomials as a function of SUPPLY-CFM/RATED-CFM forcentral systems and as a function of ASSIGNED-CFM/RATED-CFM for zonal systems.* 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.245 (Revised 5/81)