Air-Handling Unit Casings

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Air-Handling Unit CasingsMethod of Test, Rating Standard, Certification ProgramWhy it matters

Learning Objectives AHRI Standards 1350 (I-P) and 1351 (SI), MechanicalPerformance Rating of Central Station Air-handling UnitCasings– Scope– Ratings– Method of Test Central Station Air-handling Unit Casings (AHUC) CertificationProgram––––Annual testingReal unitsOptional thermal certificationUnit inspection

AHRI Standards 1350 (I-P) and 1351(SI) Scope– The enclosure which houses the fans, coils, filters, and othercomponents of the CSAHU. Generally made of metal and lined, asnecessary, with material for thermal insulation and/or acousticattenuation. Contains the air that is being conditioned, is exposed to thefan pressure, and separates the conditioned air from the surrounding air.Also called the CSAHU cabinet. Scope Exclusions– Unitary Small Equipment and Unitary Large Equipment– Direct expansion dedicated outdoor air system units– CSAHU’s designed to only operate with internal casing pressure between-1 in. H2O and 1 in. H2O [-250 Pa and 250 Pa]

AHRI Standards 1350 (I-P) and 1351(SI) cations;test requirements;rating requirements;minimum data requirements for Published Ratings;marking and nameplate data; Allows for equal comparisons of AHU Casings based on astandardized method of test. From a single tested unit, 5 ratings are derived

AHRI Standards 1350 (I-P) and 1351(SI) The 5 ratings derived:––––Casing Air Leakage ClassCasing Deflection Rating ClassThermal Bridging ClassThermal Transmittance Class With and Without Leakage

AHRI Standards 1350 (I-P) and 1351(SI) Casing Air Leakage Rate– The air flow leaking through the casing of a Central Station Air-handling Unitper 100 square feet [10 m2]of Casing Surface Area, cfm/100 ft2 [L/s/10 m2] Leakage Class– The rating class designation that defines the maximum expected air flowleakage, cfm/100 ft2 [L/s/10 m2], of the CSAHU casing operating within theinterior pressure conditions specified for the total casing surface area– Negative and positivepositivenegative

AHRI Standards 1350 (I-P) and 1351(SI) Casing Air Leakage Rate

AHRI Standards 1350 (I-P) and 1351(SI)

AHRI Standards 1350 (I-P) and 1351(SI) ି . ହ4ି . ହ · 9· 9 · 0.406 3.65 1 ି . ହ6ି . ହ · 9· 9 · 0.312 2.81 ଷ 1

AHRI Standards 1350 (I-P) and 1351(SI) Casing Deflection– The deformation of the external surface of the casing, measured perpendicular to theplane of the casing surface, when the unit is subjected to a positive or negative internalair pressure, in. [mm] Deflection Class– The rating class designation defined by the CSAHU’s Maximum Normalized Deflection atthe corresponding Rating Differential Static Pressure.

AHRI Standards 1350 (I-P) and 1351(SI) Rating Differential Static Pressure– The differential static pressure required for determining Deflection Class, in H2O [Pa]. Span– The shortest linear dimension of the CSAHU casing, width, height or depth, to beused in calculating the relative deflection of the corresponding surface.

AHRI Standards 1350 (I-P) and 1351(SI)0 min.5 min.10 min 15 minAvg.Pressure (Pi), in H2O8.028.038.018.038.02Deflection at MaximumDeflection Point, inches0.38570.38610.38620.38550.385994 in.ஔೞ ೌ ାஔ ೌ δbaseline ଶ . ସହା . ସଽδbaseline ଶ 0.0047δnet ̅- δbaseline 0.3859-0.0047 0.3812δnet ̅- δbaselineδ δavg 0.3859ஔ ೞ ೌ δnd .ଷ଼ଵଶଽସ .004055

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Bridge– The minimum temperature difference between the dry-bulb airtemperature inside the unit and the exterior surface temperature of theCSAHU. Thermal Bridging Factor Thermal Bridging Class– The rating designation class that defines the Thermal Bridging Factor.

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Bridging Class

AHRI Standards 1350 (I-P) and 1351(SI) ௦ 106 83 0.6388 ଶ 106 70 ௦ 106 77 0.8055 ଵ 106 70

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Testing – Test-set-up

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Testing – Test-set-up

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Testing – Test-set-up

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Testing – Test-set-up

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Transmittance– The rate at which thermal energy is transmitted through the casing withor without air leakage, Btu/h/ft2/ F [W/m2·K]. (Also known as the Uvalue.) Thermal Transmittance Class– The rating designation class that defines the maximum rate at whichenergy, Btu/h/ft2/ F [W/m2·K], will be transmitted through the CSAHUcasing as a function of total casing surface area and temperaturedifference from interior to exterior of the unit with or without thecalculated rate of energy lost through air leakage at Standard RatingConditions.

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Transmittance

AHRI Standards 1350 (I-P) and 1351(SI)The unit has a total surface area (excluding block-off panels) of 140 ft2(Anet) and the measured leakage is 17.1 cfm (Qanet) and the powerinput for the heaters is 0.19 kW and 0.37 kW for the circulating fans. 3412.14 · 3412.14 · ( ௧ ௦ . 3412.14 · (0.19 .37) 1910.7984 60 · ρ · · ௧ · 60 · 0.076 · 0.241 · 17.1 · 106 68 741.104 ௧ ௪ ௧ ௦) 1910.7984 741.104 2651.90242651.9024௧ 0.40302 ସ 140(113 66) ௧ ܷ௪ ௧ ௨௧ ܣ ௧ ݍ 1910.7984 0.2904 ܶܥ ଷܶ ܶ 140(113 66)

AHRI Standards 1350 (I-P) and 1351(SI) Thermal Performance Rating Limitations– Thermal performance ratings are intended to be used only to comparethe construction of different Central Station Air-handling Units.– The numerical value associated with the rating class cannot be used topredict actual application Thermal Transmittance through casing or therisk of condensation for any specific Central Station Air-handling Unit.

AHRI Standards 1350 (I-P) and 1351(SI) AHRI Standards 1350 and 1351 are available on AHRI’s website– As with all AHRI standards, they are available to download at no cost– The download of 1350 of 1351 includes the entire method of test

Why Choose AHRI-Certified Products Foremost globally recognized HVACR & water heatingcertification program Voluntary program Qualification is lengthy and rigorous 400 participants across all program– 600 Licensees– Including 58 International Licensees from 16countries 2,500 independent laboratory tests annually Accredited by Standards Council of Canada (SCC)

Why You Can Trust AHRI AHRI contracts with a third-party lab to conduct all tests Products are randomly selected for testing Operation Manuals dictate strict procedure foradministration of the certification program AHRI Directory is recognized by government agencies– EPA (Environmental Protection Agency)– DOE (U.S. Department of Energy)– FTC (Federal Trade Commission)– NRCan (Natural Resources Canada)– CEC (California Energy Commission)

Third-party Verification Manufacturer performance ratings verified by a third-partylaboratory Holds manufacturers accountable Provides consumers with confidence in performance of theproduct

AHUC Certification Program A Participant’s listing shall be grouped by BMG. At a minimum, aBMG is a regular range of units having the construction andsimilar geometry parameters and no more than two (2) classesin any singular rating class (i.e. CD1 and CD2) as stated below: Similar wall construction– Single Wall Frame and/or Panel construction variations (i.e. 2’ center to centerdistances)– Double Wall Frame and/or Panel construction variations– Similar insulation thickness and type (i.e. 2” fiberglass or 4” foam)– Similar assembly method (i.e. similar Seam Construction, seamtreatments, bracing, caulking, gasketing, etc.)

Qualification Process Application Submittals– Application is separately applied to each CertificationProgram– Ratings provided for all models (Certify All) Testing– 20% Basic Model Groups are tested– Conducted by a 3rd party lab (not AHRI)– Laboratories in the US and Asia

Qualification Process Sample Inspection

How to Join the Central Station Air-handling UnitCasings (AHUC) Certification Program Step 1: Certification Application Package– A. AHRI sends Interest Letter to OEM: Application for AHRI Certification (certification & billing contact form)Annual Sales Volume formProduct-specific data submittal sheetsOne test report for every BMG or Basic Model subject to certification.Witness Facility Approval paperwork (if applicable)Selection software programs (in lieu of paper catalog)– B. AHRI receives completed documentation within 60 calendar daysand sends confirmation. Step 2: Processing Application Package– A. AHRI sends Participation and License Agreement for OEMs– B. AHRI sends Participation and License Fee Invoice

How to Join the Central Station Air-handling UnitCasings (AHUC) Certification Program Step 3: Selection and Qualification Testing– A. AHRI sends Qualification Selection Letter Acquisition of qualification test samples Witness test program provisions– B. Qualification Test Results: IF QUALIFICATION TESTS PASS:– Proceed to step 4 IF QUALIFICATION TESTS FAIL:– AHRI will send a Manufacturer’s Decision Form (MDF).– The applicant will have 7 calendar days to respond to AHRI with oneof the following decisions:» 2nd sample» Re-rate» Discontinue the qualification process

How to Join the Central Station Air-handling UnitCasings (AHUC) Certification Program Step 4: Acceptance into the program– A. AHRI sends Welcome Letter and executed Agreement to theapplicant– B. Applicant’s data will be uploaded to the AHRI Directory of CertifiedProduct Performance

Central Station Air-handling Unit Casings (AHUC)Certification Program Participants GD Midea Heating & Ventilating Equipment Co., Ltd.

Central Station Air-handling Unit Casings (AHUC)Certification Program Annual Testing Once the qualification process has completed, a Participantis subject to annual testing.– 10% of a Participant’s BMGs shall be tested annually, with aminimum of two (2) models.– 25% of a Participant’s Annual Testing samples shall have aSample Inspection with at least one sample verified every 2testing years.

Importance of AHRI-certified AHU Casings Third-party verification of published ratings Voluntary Failures are noted for one year– Re-rates are required to consistent with tested results and must beapproved by AHRI in the Participant’s software/catalog. Allows for equal comparisons of AHU Casings based on astandardized method of test through the AHRI Directory.

How to Incorporate AHRI Certified Ratings Example specifications– “Each unit shall have an AHRI-certified casing with a minimumrating class of CD2 for deflection, CT2 for thermal transmittance,CL2 for leakage, and CB2 for thermal bridging.”

Questions?

Thermal Testing –Test-set-up AHRI Standards 1350 (I-P) and 1351(SI) Thermal Testing –Test-set-up AHRI Standards 1350 (I-P) and 1351(SI) Thermal Transmittance –The rate at which thermal energy is transmitted through the casing with or without air leakage, Btu/h/ft2/ F [W/m2·K]. (Also known as the U-

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