1、ANSI/ASHRAE Standard 79-2015(Supersedes ANSI/ASHRAE Standard 79-2002)Method of Test forFan-Coil UnitsApproved by ASHRAE on September 30, 2015, and by the American National Standards Institute on October 1, 2015.ASHRAE Standards are scheduled to be updated on a five-year cycle; the date following the
2、 Standard number is the year ofASHRAE approval. The latest edition of an ASHRAE Standard may be purchased on the ASHRAE website (www.ashrae.org)or from ASHRAE Customer Service, 1791 Tullie Circle, NE, Atlanta, GA 30329-2305. E-mail: ordersashrae.org. Fax: 678-539-2129. Telephone: 404-636-8400 (world
3、wide) or toll free 1-800-527-4723 (for orders in US and Canada). For reprintpermission, go to www.ashrae.org/permissions. 2015 ASHRAE ISSN 1041-2336SPECIAL NOTEThis American National Standard (ANS) is a national voluntary consensus Standard developed under the auspices of ASHRAE. Consensus is define
4、dby the American National Standards Institute (ANSI), of which ASHRAE is a member and which has approved this Standard as an ANS, as“substantial agreement reached by directly and materially affected interest categories. This signifies the concurrence of more than a simple majority,but not necessaril
5、y unanimity. Consensus requires that all views and objections be considered, and that an effort be made toward their resolution.”Compliance with this Standard is voluntary until and unless a legal jurisdiction makes compliance mandatory through legislation. ASHRAE obtains consensus through participa
6、tion of its national and international members, associated societies, and 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 memb
7、ers may or may not be ASHRAE members, allmust be technically qualified in the subject area of the Standard. Every effort is made to balance the concerned interests on all Project Committees. The Senior Manager of Standards of ASHRAE should be contacted fora. interpretation of the contents of this St
8、andard,b. participation in the next review of the Standard,c. offering constructive 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 availa
9、ble information and acceptedindustry practices. However, ASHRAE does not guarantee, certify, or assure the safety or performance of any products, components, or systemstested, installed, or operated in accordance with ASHRAEs Standards or Guidelines or that any tests conducted under its Standards or
10、 Guidelineswill be nonhazardous or free from risk.ASHRAE INDUSTRIAL ADVERTISING POLICY ON STANDARDSASHRAE Standards and Guidelines are established to assist industry and the public by offering a uniform method of testing for rating purposes, bysuggesting safe practices in designing and installing eq
11、uipment, by providing proper definitions of this equipment, and by providing other informationthat may serve to guide the industry. The creation of ASHRAE Standards and Guidelines is determined by the need for them, and conformanceto them is completely voluntary.In referring to this Standard or Guid
12、eline and in marking of equipment and in advertising, no claim shall be made, either stated or implied,that the product has been approved by ASHRAE.ASHRAE Standard Project Committee 79Cognizant TC: 5.3, Room Air DistributionSPLS Liaison: Peter SimmondsByron B. Hagan, Sr., Chair* John M. Filler, Jr.*
13、 Jerry M. Sipes*R. Gaylon Richardson, Vice Chair* Frederick A. Lorch* Jack L. Stegall* Denotes members of voting status when the document was approved for publicationASHRAE STANDARDS COMMITTEE 20152016Douglass T. Reindl, Chair Steven J. Emmerich Heather L. PlattRita M. Harrold, Vice-Chair Julie M. F
14、erguson David RobinJames D. Aswegan Walter T. Grondzik Peter SimmondsNiels Bidstrup Roger L. Hedrick Dennis A. StankeDonald M. Brundage Srinivas Katipamula Wayne H. Stoppelmoor, Jr.John A. Clark Rick A. Larson Jack H. ZarourWaller S. Clements Lawrence C. Markel Julia A. Keen, BOD ExOJohn F. Dunlap A
15、rsen K. Melikov James K. Vallort, COJames W. Earley, Jr. Mark P. ModeraKeith I. Emerson Cyrus H. NasseriStephanie C. Reiniche, Senior Manager of StandardsCONTENTSANSI/ASHRAE Standard 79-2015,Method of Test for Fan-Coil UnitsSECTION PAGEForeword .21 Purpose and Scope.22 Definitions .23 Test Instrumen
16、ts .34 Test Conditions .45 Test Apparatus56 Installation of Fan Coil Under Test107 Test Methods and Procedures118 Calculations.129 Sound Measurement Methods and Procedures1610 Reference Properties and Data.1711 References18Normative Annex A: Primary Airflow Measurement 19Normative Annex B: Alternate
17、 Airflow Measurement 21Informative Annex C: Alternate Mixing-Tube Reference Dimensions .23Informative Annex D: Examples of Various Types of Exposed and Concealed Fan Coils24NOTEApproved addenda, errata, or interpretations for this standard can be downloaded free of charge from the ASHRAE Web site at
18、 www.ashrae.org/technology. 2015 ASHRAE1791 Tullie Circle NE Atlanta, GA 30329 www.ashrae.org All rights reserved.ASHRAE is a registered trademark of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.ANSI is a registered trademark of the American National Standards I
19、nstitute.2 ANSI/ASHRAE Standard 79-2015(This foreword is not part of this standard. It is merelyinformative and does not contain requirements necessaryfor conformance to the standard. It has not been pro-cessed according to the ANSI requirements for a standardand may contain material that has not be
20、en subject topublic review or a consensus process. Unresolved objec-tors on informative material are not offered the right toappeal at ASHRAE or ANSI.)FOREWORDASHRAE Standard 79 prescribes laboratory methods oftesting the capacity of fan-coil units.The 2015 edition of the standard includes updates t
21、o pur-pose, scope, and definitions. Updates to the traceability for cal-ibration of test instruments were brought in alignment withother related standards, and test instruments in Section 4 wereupdated to current models. References to an alternative methodof airflow in Normative Annex B were added t
22、o Section 5. Newmaterial was added to Section 9 to update and clarify methodsfor testing exposed and concealed fan coils for total sound, aswell as methods to measure sound paths for discharge andradiated sound. An alternate method of airflow measurementwas added to Normative Annex B. Two new annexe
23、s, Informa-tive Annex C, “Alternate Mixing-Tube Reference Dimensions,”and Informative Annex D, “Examples of Various Types ofExposed and Concealed Fan Coils” were included. Figureswere updated to improve resolution and clarity, and new fig-ures were added. In addition, minor editorial changes weremad
24、e, along with updates to normative references. This revision of ASHRAE Standard 79 falls under the Stan-dard Committee classification of “standard method of mea-surement.” This standard was prepared under the auspices ofASHRAE. It may be used, in whole or in part, by association orgovernment agency
25、with due credit to ASHRAE. Adherence isstrictly on a voluntary basis and merely in the interests ofobtaining uniform standards throughout the industry.1. PURPOSE AND SCOPE1.1 Purpose. The purpose of this standard is to prescribe lab-oratory methods of testing fan-coil units to ensure uniformperforma
26、nce data for establishing ratings.1.2 Scope. This standard includes procedures thata. describe and specify test instruments and apparatus,b. describe and specify laboratory test methods and proce-dures,c. describe and specify test data to be recorded,d. describe and specify calculations to be made f
27、rom testdata,e. define terms used in testing, andf. specify standard thermodynamic properties.2. DEFINITIONSequilibrium: for the purposes of this standard, a steady-statecondition during which the fluctuations of variables beingmeasured remain within the test tolerances given in Table 1for 30 minute
28、s.evaporative equilibrium: the condition attained on a humiditymeasuring instrument when the humidity measurement hasreached a stable and constant temperature.external static pressure: the sum of the absolute values of thedischarge static gage pressure and the inlet static gage pres-sure.fan-coil un
29、it: a factory-made assembly that provides air cir-culation caused by a difference in static pressure produced byan air-moving device, cooling or cooling and heating, and fil-tering of air, but does not include the source of cooling orheating. fpm: feet per minute expressed in terms of velocityinstru
30、ment accuracy: ability of an instrument to indicate orrecord the true value of a measured quantity.instrument precision: statistical error of an instrument sub-jected to repeated measurements over a range of input values.latent cooling capacity: the rate, expressed in Btu/h (W), atwhich the fan coil
31、 under test reduces the moisture content ofthe air passing through it.sensible capacity: the rate, expressed in Btu/h (W), at whichthe fan coil under test reduces or increases the dry-bulb tem-perature of the air passing through it.TABLE 1 Test TolerancesSymbol Item Units, I-P (SI)Test-Run Operating
32、 Tolerance Test Condition Tolerance ta1Dry-bulb temperature of air entering test unit F (C) 1.0 (0.5) 0.5 (0.25)Wet-bulb temperature of air entering test unit F (C) 0.3 (0.16) 0.3 (0.16)QanAirflow % 1.0 twlTemperature of water entering test unit for cooling capacity test F (C) 0.2 (0.1) 0.2 (0.1)twW
33、ater temperature rise (cooling) F (C) 0.2 (0.1) 0.2 (0.1)twWater temperature drop (heating) F (C) 1.0 (0.5) 1.0 (0.5)QwWater flow rate % 1.0 1.0Air pressure difference between the test room and the unitoutlet connection or between the unit inlet and unit outlet connectionin. wc (Pa) 0.01 (2.5) 0.005
34、 (1.25)Voltage applied to test unit V 2.0 1.0ta1ANSI/ASHRAE Standard 79-2015 3standard air: air weighing 0.075 lb/ft3(1.2 kg/m3), whichapproximates dry air at 70F (21.1C) and at standard baro-metric pressure.standard barometric pressure: a barometric pressure of29.92 in. Hg (101 kPa).test: the recor
35、ded group of readings of required test data takenwhile equilibrium is maintained and used in the computationof results, includingthose observed or recorded during a sufficient period toindicate that equilibrium was attained prior to the actualtest andthose recorded during the period of the test. tes
36、t run: the complete group of readings of required test data(Table 2).test-run operating tolerance: the maximum permissiblevariation of any observation during the capacity testtest condition tolerance: the maximum permissible devi-ations of the averages of the test observations from thestandard or de
37、sired test conditionstotal cooling capacity: the sum of the sensible and latentcooling capacity.3. TEST CONDITIONS3.1 Variations. The methods provided in this standard shall beused to determine fan-coil performance at various test condi-tions that may be prescribed in other standards or specifica-ti
38、ons.3.2 Tolerances. In all cases, the test conditions shall bemaintained within the tolerances specified in Section 8.6during the prescribed test period. TABLE 2 Required Test DataSymbol Item Units, I-P (SI)AirDeliveryCooling Capacity WaterHeating Capacity WaterWater-Pressure DropElectric Heat Date
39、and time Observers Fan coil under test nameplate data PbBarometric pressure in. Hg (kPa) Voltage applied to unit V Frequency Hz Fan speed rpm PePower input to fan motor W PeePower input to electric elements W AnThroat area of nozzle ft2(m2) ta1Dry-bulb temperature of air entering test unit F (C) Wet
40、-bulb temperature of air entering test unit F (C) ta2Dry-bulb temperature of air leaving test unit F (C) Wet-bulb temperature of air leaving test unit F (C) tanDry-bulb temperature of air entering nozzle F (C) ta3Dry-bulb temperature of air surrounding theplenum and mixing chamber F (C) pvVelocity p
41、ressure at nozzle throat orstatic pressure across nozzle in. wc (Pa) PnPressure at nozzle throat in. Hg (kPa) Qw Water flow rategpm (L/s)wwlb/h (kg/s)tw1Temperature of water entering test unit F (C) tw2Temperature of water leaving test unit F (C) pwWater pressure drop between piezometer rings in. Hg
42、 (kPa) under waterX- Rate of condensate collection lb/h (kg/s) ta1ta24 ANSI/ASHRAE Standard 79-20153.3 Measurements from the instruments shall be traceable toprimary standards calibrated by the National Institute of Stan-dards and Technology (NIST) or to the Bureau Internationaldes Poids et Mesures
43、(BIPM) if a National Metrology Insti-tute (NMI) other than NIST is used. Instruments shall be reca-librated on a regular schedule that is appropriate for eachinstrument, and calibration records shall be maintained. Allinstruments shall be applied in a manner that ensures compli-ance with the accurac
44、y specified for the test. 4. TEST INSTRUMENTS4.1 Temperature Measuring Instruments. Temperaturemeasuring instruments shall meet the requirements ofASHRAE Standard 41.11.4.1.1 Accuracy and precision of the temperature measuringinstruments shall be within the limits shown in Table 3.4.1.2 Scale Divisi
45、on. In no case shall the smallest scale divi-sion of the temperature measuring instrument exceed twice thespecified precision.4.1.3 Air Temperature4.1.3.1 Dry Bulb and Wet Bulb. Dry-bulb and wet-bulbtemperatures shall be read only under conditions that ensure anair velocity between 700 fpm (3.5 m/s)
46、 and 1000 fpm (5 m/s)over the wet bulb and only after sufficient time has beenallowed for equilibrium to be attained. The wick on the wet-bulb thermometer shall be clean, fit the thermometer tightly,and be moistened by distilled water. Wet-bulb thermometersshall always be downstream of dry-bulb ther
47、mometers.4.1.3.2 Water Temperature. Water temperature withinpipes may be measured by inserting the temperature measur-ing instrument directly into the water parallel to and againstthe flow. An acceptable alternate method of water temperaturemeasurement is with a liquid-filled well inserted into the
48、pipe. 4.1.3.3 Interchangeability of Instruments. Whereverpossible, temperature measuring instruments used to measurethe change in temperature of water or air shall be arranged sothat they can readily be interchanged between inlet and outletpositions after every reading, so as to improve accuracy.4.2
49、 Pressure Measurement4.2.1 Pressure measuring instruments shall meet therequirements of ASHRAE Standard 41.32and the followingsubsections.4.2.2 Accuracy and precision of the air-pressure measuringinstruments shall be at least or better than 1% of full scale.4.2.2.1 Scale Division. In no case shall the smallest-scaledivision of the pressure measuring instrument exceed thespecified precision.4.2.3 Accuracy and precision of the water-pressure m
