AHRI 1241 SI-2016 Performance Rating of Active Chilled Beams.pdf

1、 2016 Standard for Performance Rating of Active Chilled Beams AHRI Standard 1241 (SI) Price $10.00 (M) $20.00 (NM) Copyright 2016, by Air-Conditioning, Heating, and Refrigeration Institute Printed in U.S.A. Registered United States Patent and Trademark Office IMPORTANT SAFETY RECOMMENDATIONS AHRI do

2、es 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/guideline. It is strongly recommended that products be designed, constructed, assembled, installed and opera

3、ted 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/guidelines employing state-of-the-art and accepted industry practices. AHRI does not certify or guarantee t

4、hat any tests conducted under its standards/guidelines will be non-hazardous or free from risk. Note: This standard supersedes AHRI Standard 1241(SI)-2014 with Addendum 1. For I-P ratings, see AHRI Standard 1240 (I-P)-2016. Scope of Certification Program and Certified Ratings Please refer to the mos

5、t current version of the Active Chilled Beams Certification Program Operations Manual (OM) for the Scope of the Certification Program and Certified Ratings. TABLE OF CONTENTS SECTION PAGE Section 1. Purpose 1 Section 2. Scope . 1 Section 3. Definitions . 1 Section 4. Classifications . 3 Section 5. S

6、tandard Equipment 3 Section 6. Test Requirements . 3 Section 7. Rating Requirements . 4 Section 8. Minimum Data Requirements for Published Ratings 4 Section 9. Marking and Nameplate Data . 7 Section 10. Conformance Conditions. 7 TABLES Table 1. Sound Power Level Rating Tolerances . 4 APPENDICES Appe

7、ndix A. References Normative 8 Appendix B. References Informative 8 Appendix C. Method of Testing Water Pressure Drop - Normative 9 FIGURES FOR APPENDICES Figure C1. Measuring Apparatus for Water Pressure Drop . 10 AHRI STANDARD 1241 (SI)-2016 1 PERFORMANCE RATING OF ACTIVE CHILLED BEAMS Section 1.

8、Purpose 1.1 Purpose. The purpose of this standard is to provide, for Active Chilled Beams: definitions; classifications; standard equipment; testing requirements; rating requirements; minimum data requirements for published ratings; marking and nameplate data; and voluntary conformance conditions. S

9、ection 2. Scope 2.1 This standard applies to Active Chilled Beams as defined in Section 3, including Multi-service Active Chilled Beams and Room Air Induction Units. 2.2 Exclusions. 2.2.1 This standard does not apply to Active Chilled Beams employing volatile-refrigerant coils, condensing coils, or

10、steam coils. 2.2.2 This standard does not apply to Passive Chilled Beams. Section 3. Definitions All terms in this document will follow the standard industry definitions in the ASHRAE Terminology website (https:/www.ashrae.org/resources-publications/free-resources/ashrae-terminology), unless otherwi

11、se defined in this section. 3.1 Active Chilled Beam. An air induction and diffusion device which introduces conditioned air for the purposes of temperature and/or humidity control. Primary Air is delivered through a series of Nozzles, which induces and conditions Secondary Air through a unit mounted

12、 coil. 3.1.1 Multi-service Active Chilled Beam. A chilled beam that incorporates space services other than cooling such as lighting. This type of Active Chilled Beam is usually customized to meet specific project requirements. 3.1.2 Room Air Induction Unit. A type of Active Chilled Beam that require

13、s more than 375 Pa of inlet static pressure to operate. 3.2 Air-induction Process. The process by which a jet of Primary Air induces Secondary Air through the coil. 3.2.1 Primary Air. Air delivered through the Nozzle(s) of an Active Chilled Beam. 3.2.2 Secondary Air. Air induced through the coil of

14、an Active Chilled Beam. 3.2.3 Supply Air. Supply air is the mixture of Primary Air and Secondary Air that is discharged to the space by the Active Chilled Beam. 3.2.4 Nozzle. An air flow opening in the Plenum which discharges a jet of Primary Air via the Air-induction Process. 3.2.5 Plenum. An air c

15、ompartment under positive pressure, and consisting of inlet(s) and Nozzle(s) for Primary Air. Also referred to as a Plenum Chamber 3.2.6 Induction Ratio. The ratio of the volumetric flow rate of Secondary Air to Primary Air. 3.2.7 Air Outlets and Inlets. Openings for the delivery or induction of air

16、. 3.2.7.1 Supply Air Outlet. An opening for the delivery of supply air from the Active Chilled Beam unit. AHRI STANDARD 1241 (SI)-2016 2 3.2.7.2 Induced Air Inlet. An opening through which Secondary Air is induced into the Active Chilled Beam. 3.2.8 Standard Air. Air weighing 1.204 kg/m3 which appro

17、ximates dry air at 21.1C and at a barometric pressure of 101 kPa of mercury. 3.2.9 Reference Air Temperature. Average air temperature of the induced air on the inlet side of the cooling coil(s), measured as prescribed in ANSI/ASHRAE Standard 200. 3.3 Octave Band. A band of sound covering a range of

18、frequencies such that the highest is twice the lowest. The Octave Bands used in this standard are those defined in ANSI/ASA Standard S1.11. 3.4 Passive Chilled Beam. A cooled element or coil, fixed in, above or under a ceiling that sensibly cools through natural convection using buoyancy driven air

19、flow. The cooling media in the coil is water. 3.5 Product Line. A family of units of common basic design, consisting of a set of Models, and a progression of Sizes. 3.5.1 Model. The style or structure of the Active Chilled Beam relative to the configuration of coils, Nozzles, and Air Outlets and Inl

20、ets as typified by the discharge pattern common to all Sizes. A given Model may have different Nozzle arrangements, Air Outlets and Inlets, coil configurations and Sizes. 3.5.2 Size. A measurement relative to the nominal length and width of the coil. 3.6 Published Rating. A statement of the assigned

21、 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 a particular Model and Size produced by the same manufacturer. 3.6.1 Standard Ratings. A rating based on tests performed at Standard

22、Rating Conditions. 3.6.2 Application Rating. A rating at other than Standard Rating Conditions; such other rating conditions are referred to as Application Rating Conditions. 3.7 Sensible Cooling Capacity. Capacity associated with a reduction in dry-bulb temperature, W. 3.8 “Shall“ or “Should“. “Sha

23、ll“ 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 standard is claimed. 3.8.2 Should. “Should“ is used to indicate provisions which are not mandatory but which are desirable

24、as good practice. 3.9 Sound Power Level. Ten times the logarithm to the base ten of the ratio of the sound power radiated by the source to a reference sound power, expressed in decibels (dB). The reference sound power used in this standard is 1 picowatt (pW). 3.10 Rating Conditions. Any set of opera

25、ting conditions under which a single level of performance results and which causes only that level of performance to occur. 3.10.1 Standard Rating Conditions. Rating Conditions used as the basis of comparison for performance characteristics. 3.11 Throw. Horizontal or vertical axis distance an airstr

26、eam travels after leaving an air outlet before the stream velocity is reduced to a specific terminal value. AHRI STANDARD 1241 (SI)-2016 3 Section 4. Classifications 4.1 Active Chilled Beams are classified according to the following Product Lines: 4.1.1 Single or Multiple Discharge Openings. 4.1.2 M

27、ethod of Secondary Air Intake. 4.1.2.1 Direct Type. where the Induced Air Inlet is located in the room (Secondary Air is induced from the conditioned space). 4.1.2.2 Indirect Type. where the Induced Air Inlet is located outside the room (Secondary Air is induced from the conditioned space via the re

28、turn air Plenum). 4.1.3 Mounting Type. 4.1.3.1 Exposed mount or surface mount. 4.1.3.2 Modular (ceiling or drywall integrated). 4.1.4 Operating Inlet Static Pressure. 4.1.4.1 Less than or equal to 375 Pa of inlet static pressure. 4.1.4.2 More than 375 Pa of inlet static pressure. Section 5. Standard

29、 Equipment 5.1 Equipment. An Active Chilled Beam shall include the following as standard equipment: 5.1.1 Plenum 5.1.2 Nozzle(s) 5.1.3 Cooling, or cooling and heating, coil(s) 5.1.4 Static pressure port(s) 5.1.5 Supply Air Outlet(s) 5.1.6 Induced air opening Section 6. Test Requirements 6.1 Active C

30、hilled Beams, as described in Section 5, shall be tested for rating in accordance with the provisions set forth in ANSI/ASHRAE Standard 200, except as noted in Appendix C. AHRI STANDARD 1241 (SI)-2016 4 Section 7. Rating Requirements 7.1 Standard Ratings. Standard Ratings shall be established at the

31、 Standard Rating Conditions specified in Section 7.2 and shall be expressed in terms of rounded to the nearest 10 W, and in terms of the flow of Primary Air in liters per second (standard L/s) rounded off to the nearest 1 standard L/s. 7.2 Standard Rating Conditions. Standard Ratings shall be determ

32、ined from tests, using the methods of testing set forth in ANSI/ASHRAE Standard 200. 7.3 Application Rating Conditions. Application ratings shall permit selection of units for at least a range of conditions commonly encountered, and shall be based on corresponding ranges of the parameters listed in

33、Section 8. 7.4 Tolerances. To comply with this standard, Published Ratings shall be based on data obtained in accordance with the provisions of Sections 8 of this standard, and shall be such that any production chilled beams, when tested, will meet these ratings within the following tolerances: 7.4.

34、1 Water flow rate shall be greater than or equal to 95% of the rating. 7.4.2 Water pressure drop shall be no greater than 110% of the rating or 3 kPa above the rating, whichever is greater. 7.4.3 Water coil capacity shall be greater than or equal to 95% of the rating. 7.4.4 Primary Air flow rate sha

35、ll be less than or equal to 105% of the rating. 7.4.5 Induced air flow rate shall be greater than or equal to 90% of the rating. 7.4.6 Discharge air throw distance shall be within 20% or 30 cm of the rating whichever is greater. 7.4.7 Sound Power Levels shall not exceed the published values in each

36、Octave Band by more than the rating tolerance shown In Table 1. Table 1. Sound Power Level Rating Tolerances Octave Band Octave Band Center Frequencies, Hz Rating Tolerance, dB 2 125 6 3 250 4 4 500 3 5 1000 3 6 2000 3 7 4000 3 Section 8. Minimum Data Requirements for Published Ratings 8.1 Published

37、 Ratings. Published Ratings shall consist of Standard Ratings. Application Ratings may be published in addition to Standard Ratings. Wherever Application Ratings are published or printed, they shall include or be accompanied by the Standard Rating, clearly designated as such. Application Ratings sha

38、ll include the information contained in Section 8.3 and shall clearly define the pertinent conditions as indicated in Section 8.4. 8.2 Standard Ratings. Standard Ratings shall consist of at least the following information, obtained at Standard Rating Conditions: 8.2.1 Primary Air flow rate, standard

39、 L/s 8.2.2 Primary Air temperature (isothermal to Reference Air Temperature), 24C 8.2.3 Entering water temperature (cooling), 14C AHRI STANDARD 1241 (SI)-2016 5 8.2.4 Minimum Primary Air pressure drop, reported value, rounded to 25 Pa. At this condition, also include the following information: 8.2.4

40、.1 Water coil capacity, reported, W 8.2.4.2 Induced air flow rate, standard L/s 8.2.4.3 Leaving water temperature (reported), C 8.2.4.4 Water flow rate (adjusted to achieve mean water temperature differential of 8 K, relative to Reference Air Temperature), L/s 8.2.4.5 Water pressure drop (reported),

41、 kPa 8.2.4.6 Supply Air throw distance at 0.5 m/s (with Supply Air at isothermal conditions relative to the test room to be determined using ANSI/ASHRAE Standard 70 and air volume to be at manufacturer supplied value for Primary Air), m 8.2.4.7 Sound generation (combined radiated and discharge sound

42、) by Octave Bands 2 to 7. Air volume to be at manufacturers supplied value for Primary Air. 8.2.5 Maximum Primary Air pressure drop, reported value, rounded to 25 Pa. At this condition, also include the following information: 8.2.5.1 Water coil capacity, reported, W 8.2.5.2 Induced air flow rate, st

43、andard L/s 8.2.5.3 Leaving water temperature, reported value C 8.2.5.4 Water flow rate, L/s, adjusted to achieve mean water temperature differential of 8 K, relative to reference air temperature 8.2.5.5 Water pressure drop, reported, kPa 8.2.5.6 Supply Air throw distance at 0.5 m/s (with Supply Air

44、at isothermal conditions relative to the test room to be determined using ANSI/ASHRAE Standard 70 and air volume to be at manufacturer supplied value for Primary Air), m 8.2.5.7 Sound generation (combined radiated and discharge sound) by Octave Bands 2 to 7. Air volume to be at manufacturers supplie

45、d value for Primary Air. 8.2.6 Primary Air pressure drop, 125 Pa. At this condition, also include the following information: 8.2.6.1 Water coil capacity, reported, W 8.2.6.2 Induced air flow rate, standard L/s 8.2.6.3 Leaving water temperature (reported), C 8.2.6.4 Water flow rate (adjusted to achie

46、ve mean water temperature differential of 8 K, relative to Reference Air Temperature), L/s 8.2.6.5 Water pressure drop (reported), kPa 8.2.6.6 Supply Air throw distance at 0.5 m/s (with Supply Air at isothermal conditions relative to the test room to be determined using ANSI/ASHRAE Standard 70 and a

47、ir volume to be at manufacturer supplied value for Primary Air), m AHRI STANDARD 1241 (SI)-2016 6 8.2.6.7 Sound generation (combined radiated and discharge sound) by Octave Bands 2 to 7. Air volume to be at manufacturers supplied value for Primary Air. 8.3 Published Application Ratings. Published Ap

48、plication Ratings shall consist of at least the following information: 8.3.1 Primary Air flow rate, standard L/s 8.3.2 Primary Air temperature, C 8.3.3 Dew point temperature of room and Primary Air, C 8.3.4 Primary Air pressure drop, Pa 8.3.5 Room air temperature (induced to the beam for cooling), C

49、 8.3.6 Water coil sensible capacity, W 8.3.7 Entering water temperature (cooling), C 8.3.8 Leaving water temperature, C 8.3.9 Water flow rate, L/s 8.3.10 Water pressure drop, kPa 8.3.11 Supply Air throw distance, 0.5 m/s with Supply Air at isothermal conditions relative to the test room to be determined using ANSI/ASHRAE Standard 70. Air volume to be at manufacturer supplied value for Primary Air. 8.3.12 Supply Air temperature, C 8.3.13 Sound generation (combined radiated and discharge sound) by Octave Bands 2 to 7. 8.3.14 Total Sensible Cooling Capacity, W 8.3.1