1、 2003 STANDARD fo AL-FT ATIVELY-REFRIGERANT CONDENSERS rREMOTEMECHANICDRAEVAPORCOOLEDStandard 490 4100 N. FAIRFAX DR., SUITE 200 ARLINGTON, VIRGINIA 22203 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitte
2、d without license from IHS-,-,-NT cts, components or ed, tested, rated, installed or operated in accordance with this standard/guideline. It is strongly in accordance with ts covered by this ARI uses its best efforts to develop standards/guidelines employing state-of-the-art and accepted industry pr
3、actices. ARI does not certify or guarantee that any tests conducted under its standards/guidelines will be hazardous or free from risk. IMPORTASAFETY DISCLAIMER ARI does not set safety standards and does not certify or guarantee the safety of any produsystems designrecommended that products be desig
4、ned, constructed, assembled, installed and operated nationally recognized safety standards and code requirements appropriate for producstandard/guideline. non-Note: This standard supersedes ARI Standard 490-1998. Price $10.00 (M) $20.00 (NM) Copyright 2003, by Air-Conditioning and Refrigeration Inst
5、itute Printed in U.S.A. Registered United States Patent and Trademark Office Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE OF CONTENTS SECTION PAGE 1. .1 2. .1 Sect
6、ion 3. Definitions 1 Section 4. Test Requirements 2 5. .2 6. .3 7. .4 Section 8. Marking and Nam ta.4 n 9. .4 TABLES .2 APPENDICES Appendix A. References - Normative5 Appendix B. References - Informative 5 Section Purpose Section Scope .Section Rating Requirements .Section Calculations .Section Mini
7、mum Data Requirements for Published Ratingseplate DaSectio Conformance Conditions.Table 1. Standard Rating Conditions.Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyri
8、ght Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 490-2003 RE PORATIVELY- ED REFR S dard poras: definitions;requirements; rating requirements; calculations; minda arki
9、nna itions. ded fnce of the industry, including manufactengineers, installers, contractors and users. 1.1.2 endment. This standard isubject to review and amendment as technologSection 2. Scope 2.1 Scope. This standard applies to EvaporativCo ard and ilim (R-22) andam xternal air res2.22.2.1 This sta
10、ndard does not applEvaporative Condensers designed primariinst hinery compartmeself-contained product or on a factory-asseoes not apply to RMechanical-Draft Air-Cooled Refri460.rd industrdefinitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air Conditioning, and Refrigera
11、tion, unless otherwise defined. 3.1 Entering Air Wet-Bulb Temperature. The average wet-bulb temperature of the air entering the condenser assembly, F C. 3.2 Net Refrigeration Effect. The rate of total heat absorption by the refrigerant, at stated evaporator conditions, of the complete refrigeration
12、system. This effect is equal to the product of the refrigerant mass flow he enthalpy difference he refrigerant vapor leaving the evaporator and liquid control device of ent of assigned values ics, under stated Rating y be chosen to fit its all units of like ion) produced by the lished Rating include
13、s the rating of all performance characteristics shown on the s, advertising or other ftware and computer-ntrolled by the manufacturer, at 3.3.1 Application Rating. A rating based on tests ating conditions (other tions). rating based on tests g Conditions. rating conditions rformance results, and anc
14、e to occur. Conditions. Rating asis of comparison for . Evaporatively-Cooled t Condenser (Evaporative Condenser). A nection to a refrigerant ll include means for r distribution and heat transfer surface by which heat is transferred from rpose of this unit is to ense refrigerant vapor by rejecting he
15、at to water and air which are circulated over its heat transfer surface, e water and an increase 3.6 Saturated Condensing Temperature (Condensing Temperature). The saturation temperature corresponding to the refrigerant pressure at the condenser inlet(s), F C. 3.7 Shall or Should. Shall or Should sh
16、all be interpreted as follows: 3.7.1 Shall. Where shall or shall not is used for a provision specified, that provision is MOTE MECHANICAL-DRAFT EVACOOL IGERANT CONDENSERSection 3. Definitions All terms in this document follow the standarate through the system and tbetween tSection 1. Purpose 1.1 Pur
17、pose. The purpose of this stanestablish for Remote Mechanical-Draft EvaCooled Refrigerant Condenseris to tively-test imum g and or the urers, the refrigerant liquid entering the the evaporator, Btu/h W. 3.3. Published Rating. A statemof those performance characteristConditions, by which a unit maapp
18、lication. These values apply tonominal size and type (identificatsame manufacturer. The term Pubta requirements for Published Ratings; mmeplate data; and conformance cond1.1.1 Intent. This standard is intenguidas unit or published in specificationliterature, including computer sogenerated reports, c
19、oReview and Amy stated Rating Conditions. advances. performed at application rthan Standard Rating Condie s 3.3.2 Standard Rating. Aperformed at Standard Ratinndensers as defined in Section 3 of this standited to refrigerants chlorodifluoromethane monia (R-717), for use with or without eistance. y t
20、o ly for nt of a mbled 3.4 Rating Conditions. Any set of opeunder which a single level of pewhich causes only that level of perform3.4.1 Standard Rating Conditions used as the bperformance characteristics3.5 Remote Mechanical-DraftRefrigeranExclusions. allation within the maccondensing unit. 2.2.2 T
21、his standard d emote gerant factory-made encased unit for conpiping system. The unit shamechanical air circulation, wateCondensers as covered by ARI Standardrefrigerant to water and air. The pucondy thereby causing evaporation of thin the enthalpy of the air. 1 Copyright Air-Conditioning and Refrige
22、ration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 490-2003 mandatory if compliance with the standard is Should is used to indicate provisions which are not mandatory but which are ing. The difference
23、 between the saturation temperature corresponding to the liquid pressure at the ature at the he r te of is effect is nd enthalpy ntering the condenser and the refrigerant liquid leaving the tion Effect, efrigeration the heat addedto the refrigerant by the refrigerant compressor.) 3.9.1 Adjusted Tota
24、l Heat Rejection Effect. Thecondh W . Section 4. Test Requirements 4.1 Test Requirements. Evaporative Condensers shall be tested in accordance with ASHRAE Standard 64 except that barometric pressure shall b easured. Ttest-measured Capacity shall be adjusted per Section 6 of th etermine the A otalRej
25、ection Effect at Standard Rating Conditions. 2 Test Conditions. Actual test conditions shall not m S ing Conditions by more than: Barometric pressure 29 2 in Hg 98 7 kPa temperature 1.0F 0.6C ture 1.0F 0.6C entering condenser 5.0F 2.8C e condenser (when operational) shall be within 5.0F 2.8C of temp
26、erature. haft output power, hp 10% of the Published Section 5. Rating Requirements 5.1 Standard Ratings. Standard Ratings for aporative Condensers shall be determined at the Standard onditions specified in Table 1. Table 1. Standard Rating Conditions claimed. 3.7.2 Should. desirable as good practice
27、. 3.8 Subcoolcoil outlet and the liquid refrigerant tempercoil outlet, F C. 3.9 Total Heat Rejection Effect (Capacity). Ttotal heat removal from the refrigerant. Thequal to the product of the mass flow rate adifference between the refrigerant vapor eacondenser, Btu/h W. (The Total Heat Rejecfor all
28、practical purposes, is equal to the Net REffect in the evaporator of the system plus Total itions The fan and pump motor skW shall be within Ratings. Heat Rejection Effect at application ratingcorrected to Standard Rating Conditions, Btu/e m he is standard to d djusted T Heat EvRating C4.deviate fro
29、 tandard RatEntering air wet-bulbCondensing TemperaActual temperature of refrigerant vapor Makeup water entering ththe measured spray water R-22 R-717 I-P SI I-P SI Barometric Pressure 29.92 in Hg 101.0 kPa 29.92 in Hg 101.0 kPa Entering Air Wet-Bulb Temperature 78.0 F 25.6 C 78.0 F 25.6 C Condensin
30、g Temperature 105 F 40.6 C 96.3 F 35.7 C Actual Temperature of Refrigerant Vapor Entering Condenser 140 F 60.0 C 140F 60.0 C External Static Pressure 0 in H2O 0 kPa 0 in H2O 0 kPa 2 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduc
31、tion or networking permitted without license from IHS-,-,-ARI STANDARD 490-2003 5.1.2 Standard Unit Configuration. Ratings shall be based on the stanconfStandard dard unit iguration as supplied by the manufacturer with all guards, safety screens and other appurtengs are used p c operating condition
32、within the operating range for whicht Rejectionin 5.1. . To comply with this standard, any representative production unit selected at random shall at Standard e published ard Rating. 5.4 Optional Acce ories. The effect on performance of option from the manufacturer Published 6.1 Effect attescdetermi
33、ne thAdjusted Total Heat Rejection Ef at dard Rating Conditions, qsrc. justed Total Heat Rejection Efftand Ra tal Heat t at Standard Rating nd : 1 wh : CFbp e correction factor CF tion otal fan power correction factor qc = Total Heat Rejection Effect at test conditions, Btu/h W qsrc = Adjusted Total
34、 Heat Rejection Effect at Standard Rating Conditions, Btu/h W 6.1.2 Barometric Pressure Correction Factor. The barometric pressure correction factor shall be calculated as follows: )BPBP)(K(11CFcstd1bp+= 2 ances in place. 5.2 Application Ratings. Application Ratinto select an Evaporative Condenser f
35、or a s ecifistdBP = 29.92 in H1K = 0.0078 arometric pressure at test conditions, in Hg kPa g 101.0 kPa 0.0023 6.1.3 Temperature Condition Correction Factor. The temperature correction factor shall be bas m ac s published Application Ratings and shall be calculated as follows: where: BP = Bc it is in
36、tended and shall include the Total HeaEffect in the same terms as the Standard Rating5.3 Tolerancesed on the anuf turerqhave an Adjusted Total Heat Rejection Effect Rating Conditions, qsrc, not less than 95% of thStandpapppsrctcqCF = ssal accessories available should clearly be stated in the manufac
37、turersRatings. Section 6. Calculations Adjustments. The Total Heat Rejectiont conditions, q , shall be adjusted topsrc Effect Conditioqpapp = Publishe3 q = Published Total Heat Rejection at Standard Rating ns, Btu/h W d Total Heat Rejection Effect at Application Rating Conditions, Btu/h W 6.1.4 Fan
38、Power Correction Factor. The fan power correction factor shall be based on the manufacturers published fan power exponent for Capacity adjustment and shall be calculated as where: e fect Stan)tfpCF)(sq 6.1.1 Ad ect at S ard ting Conditions. For each test, a ToRejection Effecfollows: Co itions, qsrc,
39、 shall be calculated as followstcCF)(bpCF(cqrc=xsrctfpTFPc where: TFPCF = 4 TFPsrc = Total fan motor shaft output power at Standard Rating Conditions, hp W TFPc= Total fan motor shaft output power at test conditions, hp W x = Manufacturers fan power exponent for Adjusted Total Heat Rejection Effect
40、ere= Barometric pressurtc = Temperature condicorrection factor CFtfp = T3 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 490-2003 4 Section 7. Minimum Data Re
41、quirements fPubhall iwithient “l cla s to inclu e the utside the scope of ARI Standard 490.”or pof the conditions at the ratings apply. 7.2 ve Condsha) in accordance with ith Addenda W wer, hp W at 0 in re 3/s e. Pump motor shaft output power, hp kW f. Condenser recirculating water flow rate, gpm L/
42、s g. Equipment dimensions, in/ft mm/m h. Connection quantity and size, in mm ameplate Data te shall display the esignation and serial systems shall include one or more of the equipment nameplate voltage ratings shown in Table 1 of ARI Standard 110. Nameplate s shall include one or more of able 1 of
43、IEC Standard ction 9. Conformance Conditions While conformance with this standard is voluntary, conformance shall not be claimed or implied for products or equipment within its Purpose (Section 1) and Scope (Section 2) unless such claims meet all of the requirements of the standard. or Section 8. Ma
44、rking and NPublished Ratings 7.1 Minimum Data Requirements for Ratings. As a minimum, Published Ratings sall Standard Ratings. All claims to ratings scope of this standard shall include the statemin accordance with ARI Standard 490.” Alratings outside the scope of this standard shallstatement “Olish
45、ed nclude n the Rated As a minimum, the nameplamanufacturers name, model dnumber. Nameplate voltages for 60 Hertzimdvoltages for 50 Hertz systemWherever Application Ratings are publishedthey shall include a statement rinted, which ensers the utilization voltages shown in TPublication 60038. Se Each
46、Published Rating of Evaporatill include the following information: a. Refrigerant designation(sANSI/ASHRAE Standard 34 wb. Total Heat Rejection Effect, Btu/h c. Fan motor shaft output poH2O 0 kPa external pressud. Condenser air flow rate, cfm mCopyright Air-Conditioning and Refrigeration Institute P
47、rovided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 490-2003 APPENDIX A. REFERENCES NORMATIVE A1 Listed here are all standards, handbookpublications essential to thes and otheformation andim ces in thiap 002 wittion ots
48、, 2002, American Society of HeatingEngineers, A 30329-ard 64-1995, Methods of Testing Remote Mechanical-Draft rs, 1995, erating and 91 Tullie , Atlanta, GA 30329-5478, USA. A1.3 ARI Standard 110-2002, Air-Conditioning a24100 North Fairfax Drive, Suite 200, Arlington, logy of Heating, g and Refrigeration, American Society of ting, Refrigerating and Air-Conditioning e Circle, N.E., Atlanta, A1.5 IEC 60038, IEC Standard Voltages, 2002, International Electrotechnical Commission, 3 rue de Varembe, P.O. Box 131, 1211 Geneva 20, Switzerland. FERENCES INFORMATIVEB1 ther pub
