1、AHRI STANDARD 431-2014(SI) _ 2014 Standard for Performance Rating of Central Station Air-handling Unit Supply Fans AHRI Standard 431 (SI) Price $10.00 (M) $20.00 (NM) Copyright 2014, by Air-Conditioning, Heating, and Refrigeration Institute Printed in U.S.A. Registered United States Patent and Trade
2、mark Office Note: This standard supersedes AHRI Standard 430-2009. See AHRI Standard 430 for I-P ratings. Scope of Certification Program and Certified Ratings Please refer to the most current version of the Central Station Air-handling Units Supply Fans Certification Program Operations Manual (OM) f
3、or the Scope of the Certification Program and Certified Ratings. IMPORTANT SAFETY DISCLAIMER AHRI does not set safety standards and does not certify or guarantee the safety of any products, components or systems designed, tested, rated, installed or operated in accordance with this standard/guidelin
4、e. It is strongly recommended that products be designed, constructed, assembled, installed and operated in accordance with nationally recognized safety standards and code requirements appropriate for products covered by this standard/guideline. AHRI uses its best efforts to develop standards/guideli
5、nes employing state-of-the-art and accepted industry practices. AHRI does not certify or guarantee that any tests conducted under its standards/guidelines will be non-hazardous or free from risk. TABLE OF CONTENTS SECTION PAGE Section 1. Purpose 1 Section 2. Scope . 1 Section 3. Definitions. 1 Secti
6、on 4. Classifications . 4 Section 5. Test Requirements 4 Section 6. Rating Requirements . 11 Section 7. Symbols and Subscripts 12 Section 8. Minimum Data Requirements for Published Ratings . 12 Section 9. Marking and Nameplate Data . 13 Section 10. Conformance Conditions 13 FIGURES Figure 1. Unducte
7、d Fan Discharge - Horizontal Arrangement 2 Figure 2. Ducted Fan Discharge - Horizontal Arrangement 3 Figure 3. Outlet Test Unit Configuration for Multiple Parallel Housed Fans in CSAHUs with Individual Ducted Discharges . 5 Figure 4. Single Outlet Test Unit Configuration for Single or Multiple Paral
8、lel Plenum Fans in CSAHUs with Full Face Opening Axial Discharge. 5 Figure 5. Figure 15 Reprinted from “AMCA Publication 210-07, Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating”. 6 Figure 6. Figure 12 Reprinted from “AMCA Publication 210-07, Laboratory Methods of Test
9、ing Fans for Certified Aerodynamic Performance Rating” .6 Figure 7. Dimensions for Inlet Vane Proportionality 7 Figure 8. Ducted Fan Discharge CSAHU with Airflow Direction Change . 8 Figure 9. Fan and Unit Characteristics - Fan Rated and Unit Tested .10 Figure 10. Fan and Unit Characteristics - Fan
10、Rated and Unit Calculated .11 APPENDICES Appendix A. References - Normative 14 Appendix B. References - Informative 14 Appendix C. Criteria for Proportionality-Informative 15 FIGURES FOR APPENDICES Figure C1. Dimensions Used for Proportionality Equations - Housed Fan . 17 Figure C2. Dimensions Used
11、for Proportionality Equations - Plenum Fan . 17 Figure C3. Dimensions Used for Proportionality Equations - Axial Fan 17 Figure C4. Dimensions Used for Proportionality Equations - Multiple Fans (End Views) 18AHRI STANDARD 431 (SI)-2014 _ 1 PERFORMANCE RATING OF CENTRAL STATION AIR-HANDLING UNIT SUPPL
12、Y FANS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish for Central Station Air-handling Units: definitions; classifications; test requirements; rating requirements; minimum data requirements for Published Ratings; marking and nameplate data; and conformance conditions. 1
13、.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, engineers, installers, contractors, and users. 1.1.2 Review and Amendment. This standard is subject to review and amendment as technology advances. Section 2. Scope 2.1 Scope. This standard applies to C
14、entral Station Air-handling Units, as defined in Section 3. 2.1.1 This standard applies to supply fan ratings for Plenum Fans in a cabinet with a Full Face Opening Axial Discharge, Housed Centrifugal Fans, and Axial Fans. 2.2 Exclusions. 2.2.1 This standard does not apply to forced-circulation, free
15、-delivery air-coolers for refrigeration, which are covered in ANSI/AHRI Standard 420. 2.2.2 This standard does not apply to unit heaters intended for free delivery of heated air or to room fan-coils as defined in ANSI/AHRI Standard 440. 2.2.3 This standard does not apply to units that have direct ex
16、pansion coils incorporated by the manufacturer in a matched split system air-conditioner, or as otherwise defined in the product scope definition of the AHRI Unitary Small Equipment and Unitary Large Equipment Sections and covered in AHRI Standard 210/240 or in AHRI Standard 340/360. 2.2.4 This stan
17、dard does not apply to unit ventilators as defined in ANSI/AHRI Standard 840. 2.2.5 This standard does not apply to variable refrigerant flow equipment as defined in ANSI/AHRI Standard 1230. 2.2.6 This standard does not apply to DX Dedicated Outdoor Air System Units as defined in ANSI/AHRI Standard
18、920. 2.2.7 This standard does not apply to Computer and Data Processing Room Air Conditioners as defined in ANSI/AHRI Standard 1360. Section 3. Definitions All terms in this document will follow the standard industry definitions in the ASHRAE Terminology website (https:/www.ashrae.org/resources-publ
19、ications/free-resources/ashrae-terminology) unless otherwise defined in this Section. 3.1 Actual Cubic Meters Per Second (Actual m3/s), m3/s. The unit of airflow uncorrected for air density. All airflow in this standard is considered to be actual airflow rate. _AHRI STANDARD 431 (SI)-2014 2 3.2 Cent
20、ral Station Air-handling Unit (CSAHU). A factory-made encased assembly consisting of a supply fan or fans in parallel which may also include other necessary equipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying and mixing of air. It
21、shall not contain a source of mechanical cooling. This assembly is capable of use with duct work having a total static resistance of at least 125 Pa. 3.2.1 Ducted Fan Discharge Central Station Air-handling Unit. A unit that has a ducted fan outlet. (See Figure 2. Note that Figure 2 applies to Housed
22、 Centrifugal Fans and Axial Fans and that a Housed Centrifugal Fan is shown.) 3.2.2 Unducted Fan Discharge Central Station Air-handling Unit. A unit containing a fan that does not have a ducted fan outlet. (See Figure 1. Note that Figure 1 applies to all fan types in the standard but a Housed Centri
23、fugal Fan is shown) 3.3 Full Face Opening Axial Discharge. Where the discharge opening of the CSAHU is the same cross-sectional dimensions as the interior of the CSAHUs casing and the direction of the airflow is parallel with the shaft of the fan or fans. 3.4 Supply Fan. The fan that provides enough
24、 pressure to overcome the supply air restriction and may provide some or all of the pressure to overcome the return air restriction to provide air into the conditioned space. 3.4.1 Horizontal Shaft. A fan shaft that is parallel to the ground. 3.4.2 Vertical Shaft. A fan shaft that is perpendicular t
25、o the ground. 3.4.3 Direct Drive. Driver and driven fans with positive direct connections for rotations at the same speed. 3.4.4 Belt Drive. Driver and driven fans with positive belted connections for rotations at any speed. 3.4.5 Plenum Fan. A fan assembly consisting of a single inlet impeller moun
26、ted perpendicular to airflow that pressurizes a plenum chamber in an air-distribution system. 3.4.6 Axial Fan. A housed fan that moves air in the general direction of the axis about which it rotates. This includes tubeaxial fans, centaxial fans, and vaneaxial fans. Fan rotor or wheel within a tubula
27、r-type casing that includes supports for either Belt Drive or Direct Drive. 3.4.7 Housed Centrifugal Fan. Fan in which the air enters the impeller axially and leaves it substantially in a radial direction. Fan rotor or wheel within a scroll-type casing (shroud) that includes supports for either Belt
28、 Drive or Direct Drive. 3.4.8 Fan Housing. The stationary element which guides the air before and after the fans impeller. 3.5 Unit Appurtenances. Equipment added to Central Station Air-handling Units for purposes of control, isolation, safety, static pressure regain, energy/heat recovery, wear, etc
29、. Such appurtenances include coils, filters, dampers, air-mixers, spray assemblies, energy recovery devices, acoustical silencers, eliminators, etc. AHRI STANDARD 431 (SI)-2014 _ 3 Figure 1. Unducted Fan Discharge Horizontal Arrangement Figure 2. Ducted Fan Discharge Horizontal Arrangement 3.6 Publi
30、shed Rating. A statement of the assigned values of those performance characteristics, under stated Rating Conditions, by which a unit may be chosen to fit its application. These values apply to all units of like nominal capacity and type (identification) produced by the same manufacturer. As used he
31、rein, the term Published Rating includes the rating of all performance characteristics shown on the unit or published in specifications, advertising or other literature controlled by the manufacturer, at stated Rating Conditions. 3.7 Rating Conditions. Any set of operating conditions under which a s
32、ingle level of performance results, and causes only that level of performance to occur. 3.8 “Shall“ or “Should“. “Shall“ or “should“ shall be interpreted as follows: 3.8.1 Shall. Where “shall“ or “shall not“ is used for a provision specified, that provision is mandatory if compliance with the standa
33、rd is claimed. 3.8.2 Should. “Should“ is used to indicate provisions which are not mandatory but which are desirable as good practice. 3.9 Standard Air. Air weighing 1.2 kg/m3which approximates dry air at 21C and at a barometric pressure of 101.3 kPa. _AHRI STANDARD 431 (SI)-2014 4 Section 4. Classi
34、fications 4.1 Methods of Classification. Equipment covered within the scope of this standard shall be classified as shown: 4.1.1 Unit Type. 4.1.1.1 Ducted Discharge 4.1.1.2 Unducted Discharge 4.1.2 Fan Type. 4.1.2.1 Housed Centrifugal 4.1.2.1.1 Airfoil/Backward Inclined/Backward Curved 4.1.2.1.2 For
35、ward Curved 4.1.2.2 Axial 4.1.2.3 Plenum 4.1.3 Fan Drive Type. 4.1.3.1 Belt Drive 4.1.3.2 Direct Drive Section 5. Test Requirements 5.1 Test Requirements. All Standard Ratings shall be verified by tests conducted in accordance with ANSI/AMCA Standard 210 and ANSI/ASHRAE Standard 51, except as modifi
36、ed by Section 5.1.1.3. 5.1.1 Arrangements for Testing. 5.1.1.1 Single Outlet Ducted Fan Discharge Central Station Air-handling Units. Single outlet Ducted Fan Discharge Central Station Air-handling Units shall be tested in accordance with ANSI/AMCA Standard 210 and ANSI/ASHRAE Standard 51. 5.1.1.2 M
37、ultiple Outlet Ducted Fan Discharge Central Station Air-handling Units. Multiple outlet Ducted Fan Discharge Central Station Air-handling Units shall be tested as in Section 5.1.1.1 with each fan outlet ducted as shown in Figure 3 to the airflow measuring test setup. No corrections for individual fa
38、n outlet duct friction losses shall be made. AHRI STANDARD 431 (SI)-2014 _ 5 Figure 3. Outlet Test Unit Configuration for Multiple Parallel Housed Fans in CSAHUs with Individual Ducted Discharges 5.1.1.3 Unducted Fan Discharge Central Station Air-handling Units. Unducted Fan Discharge Central Statio
39、n Air-handling Units shall be tested in accordance with ANSI/AMCA Standard 210/ANSI/ASHRAE Standard 51, except when an outlet chamber with multiple nozzles within the chamber is used. The test chamber cross-sectional area shall be sized so that the maximum air velocity does not exceed 400 fpm. The t
40、est chamber height and width shall be at least 5% greater than the respective height and width of the duct connection at the test chamber. Discharge area cannot exceed the test chamber area. For example, see Figure 4. Figure 4. Single Outlet Test Unit Configuration for Single or Multiple Parallel Pl
41、enum Fans in CSAHUs with Full Face Opening Axial Discharge _AHRI STANDARD 431 (SI)-2014 6 5.1.1.4 Plenum Fan Units. The rating configuration for either Ducted Fan Discharge or Unducted Fan Discharge plenum fan units shall be full face discharge with the minimum spacing allowed per the manufacturers
42、specifications between the coil and the fan. Figure 15 in the 2007 revision of AMCA 210 shall be used for the test set-up of belt-drive plenum fan units (see Figure 5). Figures 12 or Figure 15 in the 2007 revision of AMCA 210 shall be used for the test set-up of direct-drive plenum fan units (see Fi
43、gures 5 and 6). Figure 5. Figure 15 Reprinted from “AMCA Publication 210-07, Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating” Figure 6. Figure 12 Reprinted from “AMCA Publication 210-07, Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating”
44、5.1.1.5 Units with Direct Drive Fans. The power measurement for units with direct drive supply fans shall be either calibrated motor (as defined in Section 4.4.3 of AMCA 210) or reaction dynamometer (as defined in Section 4.4.1 of AMCA 210). 5.1.1.6 Units with Belt Drive Fans. The power measurement
45、for units with belt drive supply fans shall be reaction dynamometer (as defined in Section 4.4.1 of AMCA 210). AHRI STANDARD 431 (SI)-2014 _ 7 5.2 Description of Test Unit. The test unit shall have an internal pressure drop of at least 0.020 kPa. 5.3 Extension of Test Data. In lieu of testing every
46、configuration, it is acceptable to extend test data to other configurations in accordance with the provisions of the following subsections: 5.3.1 Application of Fan Laws to Units with Inlet Vanes. Units with inlet vanes may be rated one of three ways: 1) using the fan laws as described by Section 5.
47、3.2 for proportional units with proportional fans and inlet vanes; 2) using the fan laws as described in Section 5.3.3 for proportional units with non-proportional fans and inlet vanes; or 3) using the fan laws by applying the appropriate inlet vane derate factors to units without inlet vanes rated
48、per Sections 5.3.2 or 5.3.3 when the inlet vanes of the test unit are proportional to the inlet vanes of the rated units. (Since all requirements for proportionality of cabinets, fan impellers, and housing are satisfied by provisions in either Section 5.3.2 or 5.3.3 without inlet vanes, rated units with inlet vanes derived by inlet vane derate factors must only meet inlet va
