AHRI 1241 SI-2014 Performance Rating of Active Chilled Beams.pdf

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1、 2014 Standard for Performance Rating of Active Chilled Beams AHRI Standard 1241 (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 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 is a new standard. For I-P ratings, see AHRI Standard 1240 (I-P)-2014. TABLE OF CONTENTS SECTION PAGE Section 1. Purpose .1 Section 2. Scope 1 Section 3. Definitions1 Section 4. Classifications

5、 2 Section 5. Standard Equipment .3 Section 6. Test Requirements .3 Section 7. Rating Requirements 3 Section 8. Minimum Data Requirements for Published Ratings 4 Section 9. Marking and Nameplate Data 6 Section 10. Conformance Conditions .6 TABLES Table 1. Sound Power Level Rating Tolerances 4 APPEND

6、ICES Appendix A. References Normative .7 Appendix B. References Informative .7 AHRI STANDARD 1241 (SI)-2014 1 PERFORMANCE RATING OF ACTIVE CHILLED BEAMS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to provide, for Active Chilled Beams: definitions; classifications; standard equipm

7、ent; testing requirements; rating requirements; minimum data requirements for published ratings; marking and nameplate data; and voluntary conformance conditions. Section 2. Scope 2.1 This standard applies to Active Chilled Beams as defined in Section 3, including Multi-service Active Chilled Beams

8、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 steam coils. 2.2.2 This standard does not apply to Passive Chilled Beams. Section 3. Definitions All terms in this document will follow

9、the standard industry definitions in the ASHRAE Wikipedia website (http:/wiki.ashrae.org/index.php/ASHRAEwiki) unless otherwise 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 con

10、trol. Primary Air is delivered through a series of Nozzles, which induces and conditions Secondary Air through a unit mounted 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 usuall

11、y customized to meet specific project requirements. 3.1.2 Room Air Induction Unit. A type of Active Chilled Beam that requires 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 Prim

12、ary Air. Air delivered through the Nozzle(s) of an Active Chilled Beam. 3.2.2 Secondary Air. Air induced through the coil of 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.

13、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 compartment 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 volu

14、metric flow rate of Secondary Air to Primary Air. 3.2.7 Air Outlets and Inlets. Openings for the delivery or induction of air. AHRI STANDARD 1241 (SI)-2014 2 3.2.7.1 Supply Air Outlet. An opening for the delivery of supply air from the Active Chilled Beam unit. 3.2.7.2 Induced Air Inlet. An opening

15、through which Secondary Air is induced into the Active Chilled Beam. 3.2.8 Standard Air. Air weighing 1.2 kg/m3which approximates 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

16、cooling coil(s), measured as prescribed in ANSI/ASHRAE Standard 200. 3.3 Octave Band. A band of sound covering a range of frequencies such that the highest is twice the lowest. The Octave Bands used in this standard are those defined in ANSI Standard S1.11. 3.4 Passive Chilled Beam. A cooled element

17、 or coil, fixed in, above or under a ceiling that sensibly cools through natural convection using buoyancy driven air 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

18、style or structure of the Active Chilled Beam relative to the configuration of coils, Nozzles, and Air Outlets and Inlets 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.

19、 A measurement relative to the nominal length and width of the coil. 3.6 Published 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 a particular Mo

20、del and Size produced by the same manufacturer. 3.6.1 Published Ratings shall include Standard Ratings, properly identified as such, and should, in addition, include application ratings. 3.6.2 Standard Ratings. A rating based on tests performed at Standard Rating Conditions. 3.6.3 Application Rating

21、. 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, Btu/h. 3.8 “Shall“ or “Should“. “Shall“ or “should“ shall be interpreted as

22、 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 as good practice. 3.9 Sound Power Level

23、. 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 Throw. Horizontal or vertical axis distance an airstream travels after lea

24、ving an air outlet before the stream velocity is reduced to a specific terminal value. Section 4. Classifications 4.1 Active Chilled Beams are classified according to the following Product Lines: AHRI STANDARD 1241 (SI)-2014 3 4.1.1 Single or Multiple Discharge Openings. 4.1.2 Method of Secondary Ai

25、r 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 return air Plenum). 4.1.3

26、 Ability to Form Condensation on the Coil. 4.1.3.1 Non-condensing 4.1.3.2 Condensing 4.1.4 Mounting Type. 4.1.4.1 Exposed mount or surface mount. 4.1.4.2 Modular (ceiling or drywall integrated). 4.1.5 Operating Inlet Static Pressure. 4.1.5.1 Less than or equal to 375 Pa of inlet static pressure. 4.1

27、.5.2 More than 375 Pa of inlet static pressure. Section 5. Standard 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)

28、5.1.6 Induced air opening Section 6. Test Requirements 6.1 Active Chilled Beams, as described in Section 5, shall be tested for rating in accordance with the provisions set forth in ANSI/ASHRAE Standard 200. Section 7. Rating Requirements 7.1 Standard Ratings. Standard Ratings shall be established a

29、t the 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 (L/s) rounded off to the nearest 1 L/s. AHRI STANDARD 1241 (SI)-2014 4 7.2 Standard Rating Conditions. Standard Ratin

30、gs shall be determined 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 par

31、ameters listed in 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 followin

32、g tolerances: 7.4.1 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 105% of the rating. 7.4.3 Water coil capacity shall be within 5% of the rating. 7.4.4 Primary Air flow rate shall be within 5% of the rating. 7.4.5 Induced air

33、flow rate shall within 10% of the rating. 7.4.6 Discharge air throw distance shall be within 20% or 1 foot of the rating whichever is greater. 7.4.7 Sound Power Levels shall not exceed the published values in each Octave Band by more than the rating tolerance shown In Table 1. Table 1. Sound Power L

34、evel Rating Tolerances Octave Band Center Frequencies, Hz Rating Tolerance, dB 125 6 250 4 500 3 1000 3 2000 3 4000 3 Section 8. Minimum Data Requirements for Published Ratings 8.1 Published Ratings. Published Ratings shall consist of Standard Ratings. Application Ratings may be published in additio

35、n 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 shall include the information contained in Section 8.3 and shall clearly define the pertinent conditions as indic

36、ated 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, L/s (Standard Air) 8.2.2 Primary Air temperature, 24C - Isothermal to Reference Air Temperature 8.2.3 Primary Air pres

37、sure drop, 125 Pa 8.2.4 Water coil capacity, reported, W 8.2.5 Entering water temperature, cooling: 14C AHRI STANDARD 1241 (SI)-2014 5 8.2.6 Leaving water temperature, reported value C 8.2.7 Water flow rate, L/s, adjusted to achieve mean water temperature differential of 8C relative to Reference Air

38、 Temperature 8.2.8 Water pressure drop, reported, kPa 8.2.9 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. 8.2.10 Sound generation (

39、combined radiated and discharge sound) by Octave Bands 2 to 7. Air volume to be at manufacturers supplied value for Primary Air. 8.2.11 Induced air flow rate, L/s 8.3 Published Application Ratings. Published Application Ratings shall consist of at least the following information: 8.3.1 Primary Air f

40、low rate, L/s (Standard Air) 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), cooling: C 8.3.6 Water coil sensible capacity, W 8.3.7 Entering water temperature, cooling: C 8.3

41、.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

42、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 8.3.15 Sensible water coil energy per unit volume of Primary Air, W.s/L 8.3.16 Induced air flow rate, L/s 8.3.17 Optional pu

43、blished Application Ratings may include: 8.3.17.1 Induction Ratio 8.4 Published Rating Data. Published Ratings shall include drawings indicating essential dimensions, including: AHRI STANDARD 1241 (SI)-2014 6 8.4.1 The length, height and width of the unit 8.4.2 Nozzle type 8.4.3 Size and locations o

44、f inlet(s) for Primary Air 8.4.4 Size and location of piping As a minimum, Published Ratings shall include all Standard Ratings. All claims to ratings within the scope of this standard shall include the statement “Rated in accordance with AHRI Standard 1241 (SI)”. All claims to ratings outside the s

45、cope of this standard shall include the statement “Outside the scope of AHRI Standard 1241 (SI)”. Wherever Application Ratings are published or printed, they shall include a statement of the conditions at which the ratings apply. Section 9. Marking and Nameplate Data 9.1 Model Identification. The na

46、meplate on each Active Chilled Beam shall include sufficient Model and Size identification to correlate with published data, literature and any other advertising issued by the manufacturer. 9.2 Marking and Nameplate Data. As a minimum, the nameplate shall display the manufacturers name, Model design

47、ation, and electrical characteristics. Nameplate voltages for 60 Hz systems shall include one or more of the equipment nameplate voltage ratings shown in Table 1 of ANSI/AHRI Standard 110. Nameplate voltages for 50 Hz systems shall include one or more of the utilization voltages shown in Table 1 of

48、IEC Standard 60038. Section 10. Conformance Conditions 10.1 Conformance. While conformance with this standard is voluntary, conformance shall not be claimed or implied for products or equipment within the standards Purpose (Section 1) and Scope (Section 2) unless such product claims meet all the req

49、uirements of the standard and all of the testing and rating requirements are measured and reported in complete compliance with the standard. Any product that has not met all the requirements of the standard cannot reference, state, or acknowledge the standard in any written, oral, or electronic communication. AHRI STANDARD 1241 (SI)-2014 7 APPENDIX A. REFERENCES NORMATIVE A1 Listed here are all standards, handbooks and other publications essential to th