ASHRAE-90.1-2022- - Page 121
Extracted Content
Table 6.8.1-7 Performance Requirements for Heat Rejection Equipment—Minimum Efficiency Requirements
| Equipment Type | Total System Heat-Rejection Capacity at Rated Conditions | Subcategory or Rating Condition h | Performance Required a,b,c,f,g | Test Procedure d,e |
|---|---|---|---|---|
| Propeller or axial fan open-circuit cooling towers | All | 95°F entering water 85°F leaving water 75°F entering wb | 40.2 gpm/hp | CTI ATC-105 and CTI STD-201 RS |
| Centrifugal fan open-circuit cooling towers | All | 95°F entering water 85°F leaving water 75°F entering wb | 20.0 gpm/hp | CTI ATC-105 and CTI STD-201 RS |
| Propeller or axial fan closed-circuit cooling towers | All | 102°F entering water 90°F leaving water 75°F entering wb | 16.1 gpm/hp | CTI ATC-105S and CTI STD-201 RS |
| Centrifugal fan closed- circuit cooling towers | All | 102°F entering water 90°F leaving water 75°F entering wb | 7.0 gpm/hp | CTI ATC-105S and CTI STD-201 RS |
| Propeller or axial fan dry coolers (air-cooled fluid coolers) | All | 115°F entering water 105°F leaving water 95°F entering db | 4.5 gpm/hp | CTI ATC-105DS |
| Propeller or axial fan evaporative condensers | All | R-448A test fluid 165°F entering gas temperature 105°F condensing temperature 75°F entering wb | 160,000 Btu/h·hp | CTI ATC-106 |
| Propeller or axial fan evaporative condensers | All | Ammonia test fluid 140°F entering gas temperature 96.3°F condensing temperature 75°F entering wb | 134,000 Btu/h·hp | CTI ATC-106 |
| Centrifugal fan evaporative condensers | All | R-448A test fluid 165°F entering gas temperature 105°F condensing temperature 75°F entering wb | 137,000 Btu/h·hp | CTI ATC-106 |
| Centrifugal fan evaporative condensers | All | Ammonia test fluid 140°F entering gas temperature 96.3°F condensing temperature 75°F entering wb | 110,000 Btu/h·hp | CTI ATC-106 |
| Air-cooled condensers | All | 125°F condensing temperature 190°F entering gas temperature 15°F subcooling 95°F entering db | 176,000 Btu/h·hp | AHRI 460 |
a. For purposes of this table, open-circuit cooling tower performance is defined as the water flow rating of the tower at the thermal rating condition listed in Table 6.8.1-7 divided
by the fan motor nameplate power. b. For purposes of this table, closed-circuit cooling tower performance is defined as the process water flow rating of the tower at the thermal rating condition listed in Table 6.8.1-7
divided by the sum of the fan motor nameplate power and the integral spray pump motor nameplate power. c. For purposes of this table, dry-cooler performance is defined as the process water flow rating of the unit at the thermal rating condition listed in Table 6.8.1-7 divided by the total
fan motor nameplate power of the unit, and air-cooled condenser performance is defined as the heat rejected from the refrigerant divided by the total fan motor nameplate power of the unit. d. Section 13 contains a complete specification of the referenced test procedure, including the referenced year version of the test procedure. e. The efficiencies and test procedures for both open- and closed-circuit cooling towers are not applicable to hybrid cooling towers that contain a combination of separate wet and
dry heat exchange sections. The certification requirements do not apply to field-erected cooling towers. f. All cooling towers shall comply with the minimum efficiency listed in the table for that specific type of tower with the capacity effect of any project-specific accessories and/or
options included in the capacity of the cooling tower. g. For purposes of this table, evaporative condenser performance is defined as the heat rejected at the specified rating condition in the table, divided by the sum of the fan motor name plate power and the integral spray pump nameplate power. h. Requirements for evaporative condensers are listed with ammonia (R-717) and R-448A as test fluids in the table. Evaporative condensers intended for use with halocarbon refrig erants other than R-448A must meet the minimum efficiency requirements listed above with R-448A as the test fluid. For ammonia, the condensing temperature is defined as the saturation temperature corresponding to the refrigerant pressure at the condenser entrance. For R-448A, which is a zeotropic refrigerant, the condensing temperature is defined as the arithmetic average of the dew point and the bubble point temperatures corresponding to the refrigerant pressure at the condenser entrance.
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 119