Feedback for VRF standard in India 2017
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Template for comments and Core committee observations
DateDocument:Draft Standard - VRFProject:VRF
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Org. name/Commentor nameLine numberClause/ SubclauseParagraph/ Figure/ Table/COMMENTSProposed changeObservations of the Core committee
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(e.g. 17)(e.g. 3.1)(e.g. Table 1)GeneralTechnicalEditorial
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Ashfakpage 123.2.7Sound Power LevelThe given english is confusing.Please mention the value of dB which has to be maintained of which must not be breached on the higher side.
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Ashfakpage 155.4.1Air flow settingDucted units rated less than 8KW8KW is generally confusing between Electrical KW or a cooling KW. plz mention EKW OR CKW or just mention in in Tons or TR
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Ashfakpage 165.4.3.1Air flow setting for ducted indoorsCubic meter per second
this must be in CFM as layman understands only the word CFM
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Ashfakpage 103procedure flow chartpicture is not readablepicture must be readable
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Kamal Bhattacharyya (kbh54kamal@gmail.com)Test procedure for Fresh Air unit operating with VRF system is to be included in this standard.
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MANJEET SINGH
5.1.1.1 to 5.1.1.3
5.1.1.1 to 5.1.1.3Compressor SpeedThere is no word as of compressor SpeedIt has to be mentioned in terms of hz.
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MANJEET SINGH5.25.2Connecting tube lengthConnecting tube length can not be manucfatured specified for test conditions.Minimum 7.5 mts length to specified.i.e either 95 or 90 % of rated
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MANJEET SINGH6.1.106.1.10Standard rating cooling capacityStandarda rating cooling capacityWhat is the mimium % criteria for cooling capacity.i.e either 95 or 90 % of rated
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MANJEET SINGH6.2.6.2Maximum Operating testMaximum Operating testSince it is realability test. test duration can not be one hour it has to be minimum 4 hr and suggested to have duration of 12 hours
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MANJEET SINGH6.26.2Maximum Operating testMaximum Operating test60 minutes continious run after achieveing temp. what does it mean?? since it not the cooling test.
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MANJEET SINGH6.3.46.3.4Freeze up testFreesze up test Condenation Evaporation perfoemance test condition are missing i.e DB 21 WB 19
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MANJEET SINGHAnnef AnnefISEERISEERCoefficent A,B,C & D, what are basis of the calculation.Pls share.
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Intertek/Chandra Mohan Pathak5.25.2Connecting tube lengthNot cleared, Interconnecting from out door to first Indoor or all lengthShall be first Indoor unit 7.5 Meters and to be defined based on ducted, non ducted and total capacity ratings.
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Intertek/Chandra Mohan Pathak5.25.2Connecting tube lengthNot cleared, Interconnecting from out door to first Indoor or all Inter connecting Tubing's.Shall be first Indoor unit 7.5 Meters and to be different for ducted and non ducted units and total Capacity ratings.
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Intertek/Chandra Mohan Pathak5.4.3.25.4.3.2Cooling Minimum Air Volume rateMethod to set the minimum and half load air flow at indoor side if the air volume is regulated by indoor fan not cleared. If the only single speed IDU used.Air flow is measured value from all In doors /one indoor test samples to be run on their speed, to be controlled through exhaust fan with auto controller device like frequency driver.
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Intertek/Chandra Mohan Pathak6.1.86.1.8Duration of test: Cooling CapacityTest duration not cleared 30 min or 60 Min
Test duration shell be 60 min with 10 min equal interval
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Intertek/Chandra Mohan Pathak6.1.106.1.10Standard Rating Cooling Capacity Testthe test voltage my be 220 -240 I Ph or 380-415 v 3 Ph, one table should to given with such correlations. Like 220 - 230 V testing at 230 V.one table to be provided to cover the different voltage ranges, like 220 to 240 test voltage 230 V.
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Intertek/Chandra Mohan PathakTable3Table3Maximum operating Test conditionsThis test important to validates the most important component's reliability like Compressor, Motor, controls etc. The test condition at out door side with indoor at 32/23 C is to be changed. based on temperature climatic zones across India during peak summer.Test condition at out door side suggest 48 C or to be maintained as per IS standard Indoor Side 35/24 with 46C based on temperature across climatic zones of India during pack summer.
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Intertek/Chandra Mohan Pathak Annexture BB2.1Equipment installationHas to be specified clearly on installation manual Or manufacturer's published recommendations. or test standard. And should be similar/standard for all manufacturers.The gape between each indoor unit and from all sides to be clearly specified to get the consistent results.
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Intertek/Chandra Mohan Pathak Annexture B Figure :E2.1 Arrangement for Cassette type and hi-wall type indoor unitsThe complete cassette type indoor unit is covered in side the duct used to measure the air flow can effect the cooling performance of the test sample.Indoor unit shell be tested at 27/19 C from all sides with defined gaps, other then the discharge air outlet's, during the test, duct arrangement to be made accordingly to measure the correct Air flow.
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Intertek/Chandra Mohan Pathak Annexture FTable F1 Determination of ISEERThe reference document for defining Table1 & Table 2 is missing. Weighting coefficients A to D for calculation of ISEER to be re verifiedTo Be Common with other related standards. Or Either put some Primary Data to verfify claim
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Intertek/Chandra Mohan PathakAnnexture FF3.3.5 Duration of testTo be one duration 30 or 60 m for data
Test duration shell be 60 min with 10 min equal interval
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Intertek/Chandra Mohan PathakAnnexture FF3.3Part load test methodPart load final test method not clear as what would be settings of compressor load at part load
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AN. Ramanathan5.2 (Page 14)5.2 (Page 14)Connecting tubing length
The tubing diameters, insulation, details of installation, evacuation, and charging shall be in accordance with the manufacturer’s published recommendations. Need more details for the insulation material.
Copper Pipes (Size – Dia 6.4 mm to 41.3 mm) shall be insulated. PVC Drain pipes shall be insulated. If the VRV System is integrated with Ducting along with AHU for some areas, then GI ducts shall be insulated.
Insulation material shall conform to these specifications.

Insulation material shall be Closed Cell Flexible Elastomeric Nitrile Rubber. Insulation material shall be in accordance to European Standard - EN 14304 - Thermal insulation products for building equipment and industrial installations — Factory made flexible elastomeric foam (FEF) products. Thermal conductivity of insulation material shall not exceed 0.035 W/(m.K) at mean temperature of 0C as per EN ISO 8497/ EN 12667. Moisture Diffusion Resistance Factor or ‘µ’ value of insulation material shall be minimum 7,000 without any external barrier as per EN 13469 / EN 12086. The insulation material shall have fire performance such that it passes Class 1 as per BS476 Part 7 for surface spread of flame and also passes Fire Propagation requirement as per BS476 Part 6 to meet the Class ‘O’ Fire category as per 1991 Building Regulations (England & Wales) and the Building Standards (Scotland) Regulations 1990. The insulation material shall have fire performance of V0, HB as per UL 94, 1996. The insulation material shall be FM (Factory Mutual), USA Approved. The insulation material shall withstand maximum surface temperature of +105 Deg.C and minimum surface temperature of -50 Deg.C as per EN 14707 / EN 14706. Density of insulation material shall be between 40 to 55 Kg/m3. The insulation material shall be dust and fibre free. The insulation material shall have ODP (Ozone Depletion Potential) and GWP (Global Warming Potential) of Zero. The insulation material shall be ROHS (Resistance of Hazardous Substance) complaint. The insulation material shall have the Environmental Product Declaration as per UL.
Insulation material applied at outdoor conditions shall be covered with a covering treated woven glass cloth / any cladding for mechanical and UV protection.
Solvent Based Rubber contact adhesive shall be used for bonding the seams securely together. All butt & longitudinal joints, fittings and coverings must be closed with adhesive. Manufacturer recommended adhesive to be used along with the insulation material.
The thickness of the nitrile rubber insulation material for different application are given below for reference.
Piping -
Gas Line – 19 mm ; Liquid Line – 13 mm ; Drain Line – 9 mm / 13 mm (For High Humid Area).
Ducting –
Supply Line – 19 mm ; Return Line – 13 mm.
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Vivek Gawande5.2 (Page 14)5.2 (Page 14)Lenght of connecting Tube
Need more details for the insulation material. The tubing diameters, insulation, details of installation, evacuation, and charging shall be in accordance with the manufacturer’s recommended guidelines/ methodologies.
Insulation material shall be Closed Cell Flexible Elastomeric Nitrile Rubber. Insulation material applied at outdoor conditions shall be covered with a covering treated woven glass cloth / any cladding for mechanical and UV protection. Solvent Based Rubber contact adhesive shall be used for bonding the seams securely together. All butt & longitudinal joints, fittings and coverings must be closed with adhesive. Manufacturer recommended adhesive to be used along with the insulation material. Insulation material shall be in accordance to European Standard - EN 14304 - Thermal insulation products for building equipment and industrial installations — Factory made flexible elastomeric foam (FEF) products. Thermal conductivity of insulation material shall not exceed 0.035 W/(m.K) at mean temperature of 0C as per EN ISO 8497/ EN 12667. Moisture Diffusion Resistance Factor or ‘µ’ value of insulation material shall be minimum 7,000 without any external barrier as per EN 13469 / EN 12086. The insulation material shall have fire performance such that it passes Class 1 as per BS476 Part 7 for surface spread of flame and also passes Fire Propagation requirement as per BS476 Part 6 to meet the Class ‘O’ Fire category as per 1991 Building Regulations (England & Wales) and the Building Standards (Scotland) Regulations 1990. The insulation material shall have fire performance of V0, HB as per UL 94, 1996. The insulation material shall be FM (Factory Mutual), USA Approved. The insulation material shall withstand maximum surface temperature of +105 Deg.C and minimum surface temperature of -50 Deg.C as per EN 14707 / EN 14706. Density of insulation material shall be between 40 to 55 Kg/m3. The insulation material shall be dust and fibre free. The insulation material shall have ODP (Ozone Depletion Potential) and GWP (Global Warming Potential) of Zero. The insulation material shall be ROHS (Resistance of Hazardous Substance) complaint. The insulation material shall have the Environmental Product Declaration as per UL.

Copper Pipes (Size – Dia 6.4 mm to 41.3 mm) shall be insulated. PVC Drain pipes shall be insulated. If the VRV System is integrated with Ducting along with AHU for some areas, then GI ducts shall be insulated.
Insulation material shall conform to these specifications.

The thickness of the nitrile rubber insulation material for different application are given below for reference.
Piping -
Gas Line – 19 mm ; Liquid Line – 13 mm ; Drain Line – 9 mm / 13 mm (For High Humid Area).
Ducting –
Supply Line – 19 mm ; Return Line – 13 mm.
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Dr. K V N Rao1.0 Scope
The Standard covers a large no. of product types - refer b), c), d), e) and f) of ‘Scope’
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1.0 Scope, 1.1Standard must also cover:- a.)Water cooled condenser
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b.) Air-conditioners with Heat Recovery system
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2.0 References
Add AHRI 1231(draft), both T1 and T3 conditions will be considered, including high temperature EER and IEER (ISEER) at T3 condition.
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5.2, Table 3Connecting tubing length
5m is not enough for VRF and requirement for both Ducted and Non-Ducted indoor units should be different.
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6.1.10, Table 2Standard rating cooling capacity test
The outdoor condition should be one of ISO T1, T2 and T3 conditions. The same as AHRI 1231, tests both EER and IEER at condition T1 and T3.
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11.0, 11.1, 11.1.1, Table F2Publication of ratings, Standard ratings
The standard ratings should also include IEER or ISEER as well. The weighting co-efficients needs to be re-evaluated due to Rating Cooling Condition (39 deg C) should be re-considered.
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Table F1, F2, 6.5.3IEERAdd calculation same as section 6.5.4 of AHRI 1230
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6.2, 6.2.2, 6.2.2.1, 6.2.2.1.1Add Simultaneous Cooling & Heating Efficiency (SCHE)
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Table 5.
Refrigerant Line Length Correction Factors
Add Refrigerant Line Length Correction Factors
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6.3.3.1.1.3Airflow limitation for Non-ducted unitsAdd airflow limitation for Non-ducted Units
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Reconsideration of SEER
Reconsider SEER testing and calculation for the unit which capacity less than 19kW. The conditions and requirements of tests need to be added, if agree to separate the requirements for the unit less than 19kW and more than 19kW.
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Notes:-
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For residential AC/HPs the SEER will be used to evaluate the performance of unit.
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For commercial AC/HPs the IEER will be used to evaluate the performance of unit.
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AHRI11.0e
1.1d and e
ScopeStandard scope is limited to air-cooled VRF AC and HP only. Heat recovery and water-source equipment are not included.To consider the addition of testing for heat recovery and water source in the standard scope. Otherwise, consider the use of AHRI 1230 for testing of heat recovery and water-source equipment in India.
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AHRI1ScopeVRF equipment have a vast capacity range. The Indian standard does not call out (specifically) for what is the capacity range that it is applicable to. Is this standard applicable to residential as well as commercial applications? If so, the requirements and life cycle for residential VRF and commercial VRF are significantly different and different ratings and efficiency metrics should be used to evaluate the performance of both categories. Currently, AHRI tests and certifies IEER/EER up to 222,734 W. Below 19 kW, SEER/HSPF is used.Consider providing definitions for residential and commercial VRF equipment and associated efficiency descriptors such as SEER/HSPF and IEER/EER.
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AHRI2ReferencesAHRI 1230 is currently under revision and the latest version of the draft standard is targeted to be released in 2017/2018. The latest draft standard 1230 is being shared with ISHRAE-RAMA for review, study, and consideration. It is requested that the technical committee uses the modified content from the latest draft standard for referencing into the Indian VRF standard. Many modifications, that are vital to strengthening the testing of VRF equipment, as well as closing certain loopholes, would be beneficial to adopt in the Indian VRF standard. Examples include:

(1) Setting a maximum limitation on airflow rate for ducted systems to 55 scfm/1000 Btu/h. Details regarding this issue have been mentioned below in another point of comment.
(2) Usage of the lowest coil volume in rating VRF combinations. To ensure that the Indian VRF standard is upholding consistency in rating methodology used by OEMs, models used for testing and rating must have the lowest nominal coil volume offered by the OEM for the same nominal cooling capacity. Further, where multiple non-ducted or ducted indoor unit models are offered in the same nominal cooling capacity range, the model with the lowest efficiency fan motor shall be used to determine standard ratings.
(3) Testing of VRF systems may require the involvement of OEMs during testing. To ensure that the integrity of testing is not compromised, set instructions should be laid out on the steps/procedures to follow during testing, division of responsibilities between the laboratory and the OEM, and rules on the type of data available for OEM viewing during testing. All of these requirements are listed in detail in Appendix C of AHRI's new draft 1230.
The committee should review the latest draft AHRI 1230 standard and include its content in the Indian VRF standard.
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AHRI3Terms and DefinitionsVarious definitions extracted from AHRI 1230 have been revised in the draft standard. In addition, some new (and vital) definitions have been added to the draft standard (ex. Nominal Capacity, Latent Cooling Capacity, Sensible Cooling Capacity).Consider using the following definition of Nominal Capacity in the Indian VRF Standard, as this definition forms the basis for many requirements in the draft standard such as the use of lowest coil volume.

Nominal Capacity. The capacity value of the indoor and outdoor units published per Section 9.2. The nominal capacity shall not be more that 105% of the rated cooling capacity.
Consider reviewing the new/modified definitions in the AHRI 1230 draft standard.
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AHRI5.1Testing RequirementsThe Indian VRF standard only prescribes requirements for testing and rating of ducted-only, and non-ducted only combinations. There is no mention of how the mixed ducted systems are to be handled.The draft AHRI Standard 1230 allows the mixed ducted ratings to be an average of the pure-ducted combination and the pure-non-ducted combination. This encourages an apples-to-apples comparison of various systems between various OEMs. Therefore, it is suggested to use the average rating method for mixed-ducted combinations in the Indian VRF standard.
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AHRI5.1.1Compressor and Controller SettingHow do you define steady-state conditions?Requesting for clarification on what is steady-state conditions?
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AHRI5.1.1Compressor and Controller SettingThere should be proper boundaries established as to what a manufacturer can/cannot do during this test.Refer to Appendix C of draft AHRI Standard 1230.
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AHRI5.2Connecting Tubing LengthThe Indian VRF standard specifies a requirement of 5 m line length between the outdoor unit and indoor unit. Draft AHRI Standard 1230 requires a minimum of 10 feet for outdoor piping length + piping requirement based on system's nominal capacity (refer to Table 4 of the draft AHRI Standard 1230).Consider adopting the piping length requirements as indicated in Table 3 of the draft AHRI Standard 1230.
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AHRI5.2Connecting Tubing LengthHow do we deal with multiple outdoor modules? How much distance is required between the outdoor modules (such that there is no recirculation taking place)?Consider adding in spacing and piping requirements for multiple outdoor modules as indicated in Table 5 of the draft AHRI Standard 1230.
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AHRI5.3Indoor Unit SelectionOther than the requirement of indoor units to outdoor unit’s capacity ratio being 1 (+/-5%), there are no other requirements as to how the OEM selects the indoor units + outdoor unit’s combination. This can cause marketplace confusion and reduce the effectivity of the testing standard. to ensure that this testing standard creates a level playing field for the OEMs, and encourages an apples-to-apples comparison between the various systems offered in the marketplace, more requirements should be prescribed on how the OEM chooses their testing/rating combination of indoor + outdoor units. For example, by prescribing the use of lowest coil volume in their indoor unit combinations, OEMs will be held to some sort of consistency. The standard should also ensure that one indoor unit does not account for more than 50% of total cooling capacity.The technical committee should consider adopting the latest tested combination definition from the draft AHRI Standard 1230 , as part of the selection requirements for indoor units.
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AHRI5.4.3Aiflow settings for ducted indoor unitsCurrently, there does not exist a maximum limitation on the non-ducted indoor unit’s airflow rate. The new draft AHRI Standard 1230 has added a limitation of 55 scfm/1000 Btu/h. This is to ensure that no OEM is testing at excessively high airflow rates, that would not be a mode of function under field operation.Consider adopting a maximum airflow limitation in the Indian VRF Standard and refer to Section 6.3.3.1.1.3 of draft AHRI Standard 1230.
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AHRI5.4.4.5Table 1. External Static Pressure Requirement For Ducted Split Indoor UnitsThe ESP requirements in the Indian VRF standard differ from the ESP requirements prescribed in draft AHRI Standard 1230. Is there a reason for this difference?Requesting for clarification on the difference in ESP requirements between the Indian VRF standard and draft AHRI Standard 1230. If unintentional, consider using the draft AHRI Standard 1230 ESP requirements. It has a more expanded range of ESP requirements based on larger capacities.
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AHRI6.1.3Cooling Test (General Conditions)Does the pertinent laboratory in India can measure compressor speeds? How will the laboratory validate that the compressor speeds are in accordance to manufacturer specified values?Requesting for clarification.
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Hitesh Popli/ Ishare Section 5.4.3Airflow settingsregarding Airflow settings for ducted indoor units : Currently, there is no maximum limitation the airflow rate for ducted indoor units. This will see variation in performance results because of difference in airflow settings and hence would also results in variation in capacity for the same capacity of models. Adding the maximum limitation of airflow rates while testing the units would help to ensure that no OEM is testing at higher than prescribed airflow rates and also all OEM will have same level playing field which will be helpful for customer alsoall OEM will have same level playing field which will be helpful for customer also.
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Hitesh Popli/ Ishare Heat Exchanger AreaLikewise Heat exchanger surface area should be defined: Currently, there is limitation on the heat exchange surface area. This will see variation in performance results because of difference of heat exchanger area by various OEM and hence would also results in variation in capacity for the same capacity of models. Adding the nominal level of heat exchanger area while testing the units would help to ensure that no OEM is testing at higher than prescribed HE area and also all OEM will have same level playing field which will be helpful for customer also.all OEM will have same level playing field which will be helpful for customer also.
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