ANSI ASHRAE 174-2009 Method of Test for Rating Desiccant-Based Dehumidification Equipment.pdf

1、ASHRAE STANDARDANSI/ASHRAE Standard 174-2009Method of Test for Rating Desiccant-Based Dehumidification EquipmentApproved by the ASHRAE Standards Committee on June 20, 2009; by the ASHRAE Board of Directors onJune 24, 2009; and by the American National Standards Institute on June 25, 2009. ASHRAE Sta

2、ndards are scheduled to be updated on a five-year cycle; the date following the standard numberis the year of ASHRAE Board of Directors approval. The latest copies may be purchased from ASHRAE Cus-tomer Service, 1791 Tullie Circle, NE, Atlanta, GA 30329-2305. E-mail: ordersashrae.org. Fax: 404-321-5

3、478. Telephone: 404-636-8400 (worldwide) or toll free 1-800-527-4723 (for orders in US and Canada). Copyright 2009 American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.ISSN 1041-2336American Society of Heating, Refrigeratingand Air-Conditioning Engineers, Inc.1791 Tullie Ci

4、rcle NE, Atlanta, GA 30329www.ashrae.orgASHRAE STANDARDS COMMITTEE 20082009Hugh F. Crowther, ChairSteven T. Bushby, Vice-ChairRobert G. BakerMichael F. BedaDonald L. BrandtPaul W. CabotKenneth W. CooperSamuel D. Cummings, Jr.K. William DeanMartin DieryckxRobert G. DoerrAllan B. FraserNadar R. Jayara

5、manByron W. JonesJay A. KohlerCarol E. MarriottMerle F. McBrideFrank MyersH. Michael NewmanJanice C. PetersonDouglas T. ReindlLawrence J. SchoenBoggarm S. SettyBodh R. SubherwalWilliam F. WalterMichael W. WoodfordDavid E. Knebel, BOD ExOAndrew K. Persily, COStephanie Reiniche, Manager of StandardsSP

6、ECIAL NOTEThis American National Standard (ANS) is a national voluntary consensus standard developed under the auspices of the AmericanSociety of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). Consensus is defined by the American National StandardsInstitute (ANSI), of which ASHRAE i

7、s a member and which has approved this standard as an ANS, as “substantial agreement reached bydirectly and materially affected interest categories. This signifies the concurrence of more than a simple majority, but not necessarily unanimity.Consensus requires that all views and objections be consid

8、ered, and that an effort be made toward their resolution.” Compliance with thisstandard is voluntary until and unless a legal jurisdiction makes compliance mandatory through legislation.ASHRAE obtains consensus through participation of its national and international members, associated societies, an

9、d public review.ASHRAE Standards are prepared by a Project Committee appointed specifically for the purpose of writing the Standard. The ProjectCommittee Chair and Vice-Chair must be members of ASHRAE; while other committee members may or may not be ASHRAE members, allmust be technically qualified i

10、n the subject area of the Standard. Every effort is made to balance the concerned interests on all ProjectCommittees. The Manager of Standards of ASHRAE should be contacted for:a. interpretation of the contents of this Standard,b. participation in the next review of the Standard,c. offering construc

11、tive criticism for improving the Standard, ord. permission to reprint portions of the Standard.DISCLAIMERASHRAE uses its best efforts to promulgate Standards and Guidelines for the benefit of the public in light of available information andaccepted industry practices. However, ASHRAE does not guaran

12、tee, certify, or assure the safety or performance of any products, components,or systems tested, installed, or operated in accordance with ASHRAEs Standards or Guidelines or that any tests conducted under itsStandards or Guidelines will be nonhazardous or free from risk.ASHRAE INDUSTRIAL ADVERTISING

13、 POLICY ON STANDARDSASHRAE Standards and Guidelines are established to assist industry and the public by offering a uniform method of testing for ratingpurposes, by suggesting safe practices in designing and installing equipment, by providing proper definitions of this equipment, and by providingoth

14、er information that may serve to guide the industry. The creation of ASHRAE Standards and Guidelines is determined by the need for them,and conformance to them is completely voluntary.In referring to this Standard or Guideline and in marking of equipment and in advertising, no claim shall be made, e

15、ither stated or implied,that the product has been approved by ASHRAE.ASHRAE Standard Project Committee 174Cognizant TC: TC 8.12, Desiccant Dehumidification Equipment and ComponentsSPLS Liaison: Allan B. FraserWayne E. Caudle, Chair* Eric Joseph Kozubal*Ronnie R. Moffitt, Secretary* Milton Meckler*St

16、ephen C. Brickley* Joseph A. Pietsch*Charles J. Cromer* Joseph P. RyanDouglas R. Kosar* James R. Sand*Denotes members of voting status when the document was approved for publication 2009, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). For personal u

17、se only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAEs prior written permission.CONTENTSANSI/ASHRAE Standard 174-2009Method of Test for Rating Desiccant-Based Dehumidification EquipmentSECTION PAGEForeword. 21 Purpose 22 Scope

18、 . 23 Definitions and Nomenclature 24 Classifications. 35 Requirements . 46 Measurements 47 Apparatus . 68 Methods of Test 79 Test Procedures . 710 Data to be Recorded. 711 Calculations 712 Normative References 13Informative Annex AEntering Air Temperature and Humidity . 13NOTEWhen addenda, interpre

19、tations, or errata to this standard have been approved, they can be downloaded free of charge from the ASHRAE Web site at www.ashrae.org/technology. Copyright 2009 American Society of Heating,Refrigerating and Air-Conditioning Engineers, Inc.1791 Tullie Circle NEAtlanta, GA 30329www.ashrae.orgAll ri

20、ghts reserved. 2009, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAEs prior written permission.2 ANSI/ASHRAE

21、 Standard 174-2009(This foreword is not part of this standard. It is merelyinformative and does not contain requirements necessaryfor conformance to the standard. It has not beenprocessed according to the ANSI requirements for astandard and may contain material that has not beensubject to public rev

22、iew or a consensus process.Unresolved objectors on informative material are notoffered the right to appeal at ASHRAE or ANSI.)FOREWORDASHRAE Standard 174 provides a method of test forrating the overall performance of desiccant-based dehumidi-fication equipment. Desiccant-based systems are typicallyd

23、esigned with moisture removal as their primary function anddeliver air at lower dew points than typical air conditioningsystems. Accordingly, this method of test has been developedto assist in the measurement and documentation of variablesneeded to establish moisture-removal capacity per unit ofener

24、gy. It is intended for equipment incorporating additionalenergy transfer devices that are outside the scope of ASHRAEStandard 139, Method of Test for Rating Desiccant Dehumidi-fiers Utilizing Heat for the Regeneration Process.Annexes to this standard are included for informationpurposes only and pro

25、vide methods for comparing the perfor-mance of the desiccant dehumidification equipment to unitaryair conditioning equipment employing electric reheat as ameans for reducing the sensible heat ratio of the cooling out-put. Typical air conditioning equipment is rated at highertemperature and humidity

26、ratios than are found in desiccantsystems, requiring that comparative operational modes for airconditioning systems vary from their normal rating condi-tions. A rating standard prepared by an appropriate tradeassociation, which specifies standard rating conditions fordesiccant-based dehumidifier pro

27、ducts, would be an idealcompanion document to this ASHRAE method-of-test stan-dard.1. PURPOSEThis standard provides test methods for rating the perfor-mance of desiccant-based dehumidification equipment.2. SCOPEThis method of test applies to dehumidification equip-ment operating at atmospheric press

28、ure and using desiccantscombined with other components to dehumidify air.3. DEFINITIONS AND NOMENCLATUREThis section defines important terms according to the waythey are used in this standard and explains the symbols andunits used.3.1 Definitionsapparatus: the facilities and the instrumentation spec

29、ified inthis standard to test the equipment.dehumidifier system: equipment that utilizes desiccant-basedcomponents combined with other components within theequipment to achieve a reduction in the absolute humidity ofair. The equipment may include other components for pre-cooling or heating and/or fo

30、r post-cooling or heating of air.desiccant: a material that removes moisture by a sorptionprocess.discharge air: the air stream that is discharged from the equip-ment to the outdoor ambient that derived from return air.equipment: the hardware that is subjected to the tests of thisstandard.heat energ

31、y: the energy input to the equipment in the form offuels (natural gas, oil, or other combustible fuels), noncom-bustible heating fluids involving phase change (for example,steam), or single-phase fluids (for example, water).mode: an option of operation which is determined by thesources of the inlet

32、air streams to the equipment and the desti-nations of the exit air streams from the equipment.outdoor air: the air stream that is delivered to the equipmentfrom the outdoor ambient.outdoor air percentage: the proportion of the supply air total,expressed as a decimal, that entered the equipment as ou

33、tdoorair.return air: the air stream that is delivered to the equipmentfrom the conditioned space.sensible heat ratio: an air-conditioning system performanceparameter that identifies the fraction of the total coolingcapacity that reduces sensible heat.shall: a term used to indicate provisions that ar

34、e mandatory ifcompliance with the standard is claimed.should: a term used to indicate provisions that are not manda-tory but desirable as good practice in this standard.supply air: conditioned air that is discharged from the equip-ment. It may be derived from return air only, outdoor air only,or a m

35、ixture of both return and outdoor air.3.2 NomenclatureCp= specific heat of liquid in Btu/lbF (kJ/kgC)E = exhaust operating modefs= adjustment factor used in the determination ofWsgpm = gallons per minute (water input rate) (use L/m inSI units)hd= enthalpy, discharge air to ambient, Btu/lb (kJ/kg)of

36、dry airho= enthalpy, outdoor air at the outdoor inlet, Btu/lb(kJ/kg) of dry airhr= enthalpy, return air at the return air inlet, Btu/lb(kJ/kg) of dry airhs= enthalpy, supply air at the supply outlet, Btu/lb(kJ/kg) of dry airM = mass flow of liquid over test interval, lb (kg)p = standard barometric p

37、ressure, psia (kPa)Pe= electric power input dehumidifier system, W 2009, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org). For personal use only. Additional reproduction, distribution, or transmission in either print or digital form is not permitted wi

38、thout ASHRAEs prior written permission.ANSI/ASHRAE Standard 174-2009 3pws(o)= saturation pressure outdoor air, psia (kPa)pws(r)= saturation pressure return air, psia (kPa)pws(s)= saturation pressure supply air, psia (kPa)Qelec= electrical energy input, Btu/h (kJ/s)Qin= heat energy input rate, Btu/h

39、(kJ/s)Qgas= burnable gas input, Btu/h (kJ/s)Qp= Separated air flow energy, Btu/h (kJ/s)ql= latent cooling capacity, Btu/h (kJ/s)qs= sensible cooling capacity, Btu/h (kJ/s)qt= total cooling capacity, Btu/h (kJ/s)R = recirculation operating modeR/V = recirculation-with-ventilation operating modeR/V/E

40、= recirculation/ventilation/exhaust operating modeSCFM = standard cubic feet per minute, ft3/minSCFMd= discharge air airflow rate derived from returnair, ft3/minSCFMi= indoor air inlet airflow rate at equipment return,ft3/minSCFMr= return air inlet airflow that is delivered to supply,ft3/minSCFMs= s

41、upply airflow rate, ft3/minSCFMo= outdoor air inlet airflow that is delivered tosupply, ft3/minSCFMha= hot air energy input inlet airflow delivered toequipment, ft3/minSCFMp= separate air airflow rate, ft3/minSCMH = standard cubic meters per hour, m3/hSCMHd= discharge air airflow rate derived from r

42、eturnair, m3/hSCMHi= indoor air inlet airflow rate at equipment return,m3/hSCMHr= return air inlet airflow that is delivered to supply,m3/hSCMHs= supply airflow rate, m3/hSCMHo= outdoor air inlet airflow that is delivered tosupply, m3/hSCMHha= hot air energy input inlet airflow delivered toequipment

43、, m3/hSCMHp= separate air airflow rate, m3/hT1= temperature of energy input fluid going to theequipment, F (C)T2= temperature of energy input fluid coming fromthe equipment, F (C)tdb(o)= dry-bulb temperature-outdoor inlet, F (C)tdb(r)= dry-bulb temperature-return, F (C)tdb(s)= leaving supply dry-bul

44、b temperature, F (C)twb(o)= wet-bulb temperature-outdoor inlet, F (C)Twb(o) = wet-bulb temperature-outdoor inlet, R (K)twb(r) = wet-bulb temperature-return, F (C)Twb(r)= wet-bulb temperature-return, R (K)twb(s)= wet-bulb temperature-supply, F (C)Twb(s)= wet-bulb temperature-supply, R (K)vno = Specif

45、ic volume of outdoor air at nozzle, ft3/lb(m3/kg), of air-water vapor mixture vns = Specific volume of supply air at nozzle, ft3/lb(m3/kg), of air-water vapor mixtureV = ventilation operating mode V/O = ventilation with outdoor process operating modeW(o)= humidity ratio, outdoor inlet air, lbw/lbda(

46、kgw/kgda)W(r)= humidity ratio, return air, lbw/lbda(kgw/kgda)W(s)= humidity ratio, supply air, lbw/lbda(kgw/kgda)Ws(o)= humidity ratio of moist air at saturation, outdoorinlet air, lbw/lbda(kgw/kgda)Ws(r)= humidity ratio of moist air at saturation, returnair, lbw/lbda(kgw/kgda)Ws(s)= humidity ratio

47、of moist air at saturation, supplyair, lbw/lbda(kgw/kgda)0.075 = density of standard air, lb/ft31.2041 = density of standard air, kg/m30.240 = specific heat of standard air, I-P units, Btu/lbF1.006 = specific heat of standard air, SI units, kJ/kgC3.41 = conversion factor, Btu/h per W3.60 = conversio

48、n factor, kJ/h per W4. CLASSIFICATIONSThe equipment shall be classified based on the air flowsinto and out of the equipment as follows:If there is a separated airflow (one that does not blend withother airflows) to the equipment from the outdoors and it isdischarged from the equipment to the outdoor

49、s, this airflowshall not be considered in the above classification. However,this separated airflow, if used by the equipment, shall bemeasured to provide an energy balance check on the perfor-mance test values.Airflows: + Indicates Airflow, o Indicates No AirflowMode of OperationSupply AirReturn AirOutdoor to EquipmentDischarge Air to Outdoor4.1 Recirculation + o o4.2 Exhaust + o +4.3 Ventilation +o + o4.4 Ventilation w/Outdoor Process+o + +4.5 Recirculation w/Ventilation+ + o4.6 RecirculationVentilation/Exhaust+ + + 2009, American Society