1、 2014 Standard for Mechanical Performance Rating of Central Station Air-handling Unit Casings Approved by ANSI on May 19, 2015 ANSI/AHRI Standard 1350 (I-P) with Addendum 1 ANSI/AHRI STANDARD 1350 (I-P)-2014 WITH ADDENDUM 1 Mechanical Performance Rating of Central Station Air-handling Unit Casings S
2、eptember 2015 Addendum 1 (dated September 2015) of ANSI/AHRI Standard 1350 (I-P)-2014, “Changes to ANSI/AHRI Standard 1350 (I-P)-2014” is provided as follows. The following changes have been incorporated (deletions are shown by strikethroughs, additions are shown by shading) into the already publish
3、ed 2014 version of ANSI/AHRI Standard 1350 (I-P) to avoid confusion: Note: This addendum is not ANSI approved and is currently going through the process to become so. The changes include: 1) Added Section 3.16. Updated all subsequent numbering. 3.16 Pressure Section. A section bounded by a Pressure
4、Change Wall and/or the unit end(s) and is designed to operate entirely in Positive Pressure or Negative Pressure. 2) Updated Section 6.1.3. 6.1.3 All access points must be large enough (minimum nominal width 18 in) for a person to enter or reach in to place instrumentation, including thermal sensors
5、, heater(s), circulating fan(s), without damaging the test unit (i.e. by enlarging existing openings or creating new ones). One access point is required between end wall and first component (either fan or coil). 3) Updated Table C1. Table C1. Requirements for Test Instrumentation Measurement Measure
6、ment System Accuracy1,2,3,4,5 Display Resolution Selected, Installed, Operated, Maintained in Accordance With Air Temperature 0.2 1.0F 0.1F ANSI/ASHRAE Standard 41.1 Pressure 0.01 in H2O 0.005 in H2O ANSI/ASHRAE Standard 41.3 Standard Method for Pressure Measurement Length, width, and height 0.1 in
7、0.06 in ISO/IEC 17025 Length, deflection 0.002 in 0.001 in ISO/IEC 17025 Airflow 2.0% of the reading 1 cfm ANSI/ASHRAE Standard 41.2 Standard Method for Laboratory Airflow Measurement Power 1.0% of the quantity measured 1.0 W ANSI/ASHRAE Standard 41.11 Standard Methods for Power Measurement Notes: 1
8、. Accuracy requirement also applies to volumetric type meters. 2. Measurement system accuracy shall apply over the range of use during testing, as indicated by the Turn Down Ratio determined during calibration, i.e. from full scale down to a value of full scale divided by the Turn Down Ratio. For ma
9、ny types of instruments and/or systems this may require exceeding the accuracy requirement at full scale. Percent of Reading = %RDG, %FS = percent of full scale for the measurement instrument or measurement system. If dual requirements are shown in the table, FS and RDG, then both requirements shall
10、 be met. 3. Current Transformers and Potential Transformers shall have a metering accuracy class of 0.3 or better, rated in accordance with IEEE C57.13. 4. Display resolution shown is the minimum requirement (most coarse resolution allowable). Better (finer) resolution is acceptable for instrument o
11、r panel displays, or computer screen displays. The display resolution shown is the preferred resolution for data reporting on test reports. 5. Significant figures (also known as significant digits) determined in accordance with Section 7.2 of NIST Special Publication 260-100, “Handbook for SRM Users
12、”. 4) Updated third paragraph of Section C5.3.4. All service access points including access doors and access panels used in lieu of an access door are included in the deflection measurement and shall be installed according to the manufacturers instructions. 5) Updated Section C5.4.3. C5.4.3 Record t
13、he location of the Maximum Deflection Point on the casing drawing. Several measurements may be necessary to locate the Maximum Deflection Point. Measure and record the deflection(s) at the identified Maximum Deflection locations and the casing pressure every 5 minutes for 15 minutes. See Figure C7.
14、6) Updated Section C5.5.1. C5.5.1 The test is valid if any measured pressure, Pi, does not vary from the mean pressure, Pa, more than 0.10 in H2O, or 2%, whichever is greater, if any measured deflection, 1,2,3,4 , during the test does not vary from the average deflection, , by more than 0.01 in or 5
15、%, whichever is greater, and if the difference between the unpressurized final deflection,final ,and the unpressurized starting deflection, start, test does not vary by more than 0.01 in or 5%, whichever is greater 7) Updated Section C6.1.1.1. C6.1.1.1 Method 1: As an assembled unit with the entire
16、unit under negative or positive pressure. For negative pressure units, inward swinging doors shall be completely sealed and outward swinging doors shall not be sealed. In a negative pressure test, seal off all of the access points on the positive pressure side. For positive pressure units, outward s
17、winging doors shall be completely sealed and inward swinging doors shall not be sealed In a positive pressure test, seal off all of the access points on the negative pressure side.; or 8) Added Section C6.5.1.1. C6.5.1.1 If the unit has a Pressure Change Wall, there will be two Casing Air Leakage Ra
18、tings, one for the positive pressure section and one for the negative pressure section. 9) Updated Section C6.6.1. C6.6.1 Use the Casing Air Leakage Rate, CLx, to determine rating class. Refer to Table 2, Section 6.4. If the unit has a Pressure Change Wall, there will be 2 Casing Air Leakage Ratings
19、, one for the positive pressure section and one for the negative pressure section. 10) Updated Section C7.1.1. C7.1.1 The test shall be performed with distributed internal heat sources and circulating fans as needed to provide uniform internal temperatures. The heat source will be energized to provi
20、de a minimum of 30F higher average internal air temperature when compared to external ambient temperature but the internal temperature should not exceed 120 F. The manufacturer shall specify the maximum temperature for testing if the product has a lower maximum allowable internal temperature than 12
21、0 F. Steady state is defined in Section C7.3.3. See Figures C13, C14, and C15 for some example thermal set-ups. 11) Updated Section C7.2.3 C7.2.3 A minimum of 3 Circulating fans shall be installed inside the unit CSAHU to help achieve and maintain a uniform temperature distribution inside the unit p
22、rovide adequate air mixing to achieve uniform temperature distribution and convection inside the CSAHU. At a minimum, one fan shall be located in each Pressure Section and/or in each section divided by a coil so that circulating air is obtained throughout the entire unit. At minimum, one fan shall b
23、e located in each unit section bounded by any pressure change wall, coil, and/or unit end so that circulating air is obtained throughout the entire unit and provides adequate air mixing to achieve uniform temperature distribution inside the unit and simulate unit internal airflow velocities based on
24、 500 ft/min coil face velocity. The total airflow delivered by the circulating fan(s) in each unit section shall provide a minimum of 50 cfm per square foot of unit cross-sectional area. Multiple fans may be used to produce the required airflow. 12) Updated Section C7.2.3.1. C7.2.3.1 For example, a
25、unit with a 20 ft2 cross-sectional area will require at least 3 circulating fan(s) each delivering at least 1,000 6,000-8,000 cfm at free delivery per pressure section bounded by any pressure change wall, coil, and/or unit end. 13) Changed “thermocouple” to “temperature measuring device” throughout
26、document. Ex; C7.2.5 Thermocouples Temperature measuring devices shall be distributed inside the unit to measure and verify the uniformity of the internal air temperature. Thermocouples Temperature measuring devices shall be distributed outside the unit to measure and verify the uniformity of the ex
27、ternal air temperature. 14) Added Figures C13, C14 and C15. Figure C13. CSAHU with No Pressure Change Wall Figure C14. CSAHU with No Pressure Change Wall and Separate Coils Figure C15. CSAHU with Pressure Change Wall 15) Updated Section C7.5.5. C7.5.5 Calculate the Thermal Transmittance with leakage
28、. qtl = qin + ql C15 U = qtlAnet(TaeaiTaiae)C16 Where: qtl = total thermal energy with leakage, Btu/hr U = Thermal Transmittance, Btu/hr/F/ft2 16) Added Section C7.5.6. C7.5.6 Calculate the Thermal Transmittance without leakage. qt = qin C17 U = qtAnet(TaiTae)C18 Where: qt = total thermal energy wit
29、hout leakage, Btu/h U = Thermal Transmittance, Btu/hr/F/ft2 17) Section C8.1.2 updated. C8.1.2 The test shall be performed at nominal 350 50 ft/min calculated internal air velocity provided by the inside circulating fans with the same circulating fans used for the thermal transmittance test. Price $
30、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 Note: This is a new standard. For SI ratings, see ANSI/AHRI Standard 1351 (SI)2014. AHRI CERTIFICATION PROGRAM PROVISIONS Scope of Ce
31、rtification Program and Certified Ratings Please refer to the most current version of the Central Station Air-handling Unit Casings Certification Program Operations Manual (OM) for the Scope of the Certification Program and Certified Ratings. Foreword This standard does not include acoustic testing
32、or rating information for Central Station Air-handling Units (CSAHU). The unit must be tested in accordance with ANSI/AHRI Standard 260 (I-P) in order to determine actual unit sound power levels, inlet, discharge and casing radiated. CSAHU sound levels are dependent on many factors, for example, fan
33、 type, size, and operating conditions, casing construction and casing penetrations, etc There is often a significant interaction between the fan and the unit casing which both generates and transmits sound. The prediction of unit sound power from fan-only sound power by applying effects such as casi
34、ng noise reduction can easily result in errors as large as 15 decibels. 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/g
35、uideline. 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/
36、guidelines 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
37、 Section 4. Classifications 4 Section 5. Test Requirements 4 Section 6. Rating Requirements . 5 Section 7. Minimum Data Requirements for Published Ratings 9 Section 8. Marking and Nameplate Data 10 Section 9. Conformance Conditions . 10 TABLES Table 1. Casing Deflection Rating Class 6 Table 2. Casin
38、g Air Leakage Rating Class . 7 Table 3. Casing Thermal Transmittance Rating Class 8 Table 4. Casing Thermal Bridging Rating Class 8 FIGURES Figure 1. Casing Air Leakage Rating Class Chart . 7 APPENDICES Appendix A. References - Normative . 11 Appendix B. References - Informative 12 Appendix C. Metho
39、d of Test for CSAHU Casings - Normative . 13 TABLES FOR APPENDICES Table C1. Requirements for Test Instrumentation. . 13 FIGURES FOR APPENDICES Figure C1. Negative Pressure CSAHU Test Apparatus . . 14 Figure C2. Positive Pressure CSAHU Test Apparatus . 14 Figure C3. Positive and Negative Pressure CS
40、AHU Test Apparatus 15 Figure C4. Span Measurement Horizontal Unit 16 Figure C5. Span Measurement Vertical Unit . . 17 Figure C6. Span Measurement Pressure Change Wall Unit 18 Figure C7. Deflection Measurement. . . 19 Figure C8. Thermocouple Temperature Measuring Device Planes 24 Figure C9. Thermocou
41、ple Temperature Measuring Device Locations Side View 25 Figure C10. Thermocouple Temperature Measuring Device Locations End View 26 Figure C11. Typical Thermocouple Temperature Measuring Device Mounting. 26 Figure C12. Typical Thermocouple Temperature Measuring Device Shielding. 26 Figure C13. Examp
42、le Thermal Testing Set-up for CSAHU with No Pressure Change Wall 27 Figure C14. Example Thermal Testing Set-up for CSAHU with No Pressure Change Wall and Separate Coils. 27 Figure C15. Example Thermal Testing Set-up for CSAHU with Pressure Change Wall. . 27 ANSI/AHRI STANDARD 1350 (I-P)-2014 1 MECHA
43、NICAL PERFORMANCE RATING OF CENTRAL STATION AIR-HANDLING UNIT CASINGS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish for Central Station Air-handling Unit Casings: definitions; classifications; test requirements; rating requirements; minimum data requirements for Publis
44、hed Ratings; operating requirements; marking and nameplate data; conformance conditions. 1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, designers, installers, contractors, and end users. 1.1.2 Thermal Performance Rating Limitations. Thermal perform
45、ance ratings are intended to be used only to compare the construction of different Central Station Air-handling Units. The numerical value associated with the rating factor cannot be used to predict actual application Thermal Transmittance through casing or the risk of condensation for any specific
46、Central Station Air-handling Unit. 1.1.3 Review and Amendment. This standard is subject to review and amendment as technology advances. Section 2. Scope 2.1 Scope. This standard applies to Central Station Air-handling Units (CSAHU) as defined in Section 3.5. 2.2 Exclusions. 2.2.1 This standard does
47、not apply to forced-circulation, free-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 n
48、ot apply to units that have direct expansion 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 ANSI/AHRI Standard 210/240 or in ANSI/AHRI Standard 340/360. 2.2.4 This standard 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 do
