AHRI 550 590 I-P-2011 Performance Rating of Water-Chilling and Heat Pump Water-Heating Packages Using the Vapor Compression Cycle (Incorporated Addendum 1 September 2012 Addendum 2.pdf

1、 2011 Standard for Performance Rating Of Water-Chilling and Heat Pump Water-Heating Packages Using the Vapor Compression Cycle Approved by ANSI on June 18, 2012 ANSI/AHRI Standard 550/590 (I-P) with Addendum 3 i AHRI STANDARD 550/590 (I-P)-2011 WITH ADDENDUM 3 Performance Rating of Water-Chilling an

2、d Heat Pump Water-Heating Packages Using the Vapor Compression Cycle September 2013 Addendum 3 (dated September 2013) of AHRI Standard 550/590 (I-P)-2011, “Changes to AHRI Standard 550/590 (I-P)-2011” is provided as follows. The following changes have been incorporated (deletions are shown by shadin

3、g in red, additions are shown by shading in gray) into the already published 2011 version of AHRI Standard 550/590 (I-P) to avoid confusion: Note: This addendum is not ANSI approved and is currently going through the process to do so. The changes include: 1. Revision to Table 10. To comply with this

4、 standard, published or reported values shall be in accordance with Table 10. Table 10. Definition of Tolerances Limits Related Tolerance Equations2,3,4CapacityCooling or Heating Capacity for units with continuous unloading1Full Load minimum: 100%- Tol1Full Load maximum: 102% 100%+ Tol1Part Load tes

5、t capacity shall be within 2% of the target part-load capacity5Tol1= 0.105 (0.07 %Load) + 0.15TFL %Load 18 TFL= Difference between entering and leaving chilled water temperature at full-load, F See Figure 3 for graphical representation of the Tol1tolerance. Cooling or Heating Capacity for units with

6、 discrete capacity steps Full Load minimum: 100% - Tol1 Full load maximum: no limit (Full Load shall be at the maximum stage of capacity) Part Load test points shall be taken as close as practical to the specified part-load rating points as stated in Table 3 Water cooled heat balance (HB) - Tol1 HB

7、+Tol1EfficiencyEER Minimum of: (100%- Tol1)(rated EER) (rated EER) / (100%+ Tol1) kW/tonRMaximum of: (100%+ Tol1)(rated kW/tonR) COP Minimum of: (100%- Tol1)(rated COP) (rated COP) / (100%+ Tol1) IPLV/NPLV (EER) Minimum of: (100%- Tol2)(rated EER) (rated EER) / (100%+ Tol2) Tol2= 0.065 + 0.35TFL 19

8、See Figure 4 for graphical representation of the Tol2tolerance. IPLV/NPLV (kW/tonR) Maximum of: (100%+ Tol2)(rated kW/tonR) IPLV/NPLV (COPR) Minimum of: (100%- Tol2)(rated COPR) (rated COPR) / (100%+ Tol2) Water Pressure Drop Maximum of: (1.15)(rated pressure drop at rated flow rate) or rated pressu

9、re drop plus 2 feet of H2O, whichever is greater Notes: 1. The target set point condenser entering temperatures (Figure 1) for continuous unloading units will be determined at the target part load test point. 2. For air-cooled units, all tolerances are computed for values after the barometric adjust

10、ment is taken into account. 3. %Load and Tol1are in decimal form. 4. Tol2is in decimal form. 5. The 2.0% tolerance shall be calculated as 2.0% of the full load rated capacity (tonsR). For example, a nominal 50.0% part load point shall be tested between 48.0% and 52.0% of the full load capacity. 2. T

11、he Full-Load Tolerance examples were revised in Section 5.6.2. 5.6.2 Full-Load Tolerance Examples. Full-Load Tolerance Examples. Full-Load Example in EER Rated Full-Load Performance: Rated Capacity = 100 tonRRated Power = 111 kW Cooling TFL= 10F EER =100 tonR 12,000BtuhtonR111 kW 1,000 W kW= 10.811

12、BtuW hAllowable Test Tolerance = Tol1= 0.105 (0.07 1.00) + 0.1510 1.00 = 0.05 = 5.00% Min. Allowable Tolerance = 100% Tol1= 100% 5% = 95% Min. Allowable Capacity(tonR) = 95% (100% 5%) 100 tonR= 95 tonRMin. Allowable EERBtuW h = 95% 10.81 = 10.27 =10.811100% + 5%= 10.296 BtuW h Full-Load Example in k

13、W/tonRRated Full-Load Performance: Rated Capacity = 100 tonRRated Power = 70 kW Cooling TFL= 10F kW tonR = 70 kW100 tonR= 0.700 kWtonRAllowable Test Tolerance = Tol1= 0.105 (0.07 1.00) + 0.1510 1.00 = 0.05 = 5.00% Min. Allowable Tolerance = 100% Tol1= 100% 5% = 95% Min. Allowable Capacity = 95% (100

14、% 5%) 100 tonR= 95.00 tonRMax. Allowable Tolerance = 100% + Tol1= 100% + 5% = 105% Max. Allowable kW tonR = 105% (100% + 5%) 0.700 kW/tonR= 0.735 kW/tonRFull-Load Example in COP (Heat Pump) Rated Full-Load Performance: Rated Heating Capacity = 1,500,000 Btu/h Rated Power = 70 kW Condenser TFL= 10F H

15、eating COPH=1,500,000Btuh70 kW 3,412.14 Btu h kW= 6.28 WWAllowable Test Tolerance = Tol1= 0.105 (0.07 1. ) + 0.1510 1.00 = 0.05 = 5.0% Min. Allowable Tolerance = 100% Tol1= 100% 5% = 95% Min. Allowable Capacity = 95%(100% 5%) 1,500,000 Btu h= 1,425,000 Btu/h Min. Allowable COPH= 95% 6.28 WW100% + 5%

16、= 5.97 5.981 WW3. The Part-Load Tolerance examples were revised in Section 5.6.3 5.6.3 Part-Load. The tolerance on part-load EER shall be the tolerance as determined from 5.6.1. Part-Load Example in EER Rated Part-Load Performance: Power at 69.5% Rated Capacity = 59.6 kW 69.5% Rated Capacity = 69.5

17、tonsRCooling TFL= 10F EER = 69.5 tonR 12,000BtuhtonR59.6 kW 1,000 W/kW= 14.0 13.993 BtuW hAllowable Test Tolerance = Tol1= 0.105 (0.07 0.695) + 0.1510 0.695 = 0.078 = 7.8% Allowable Test Tolerance = Tol1= 0.105 (0.07 0.695) + 0.1510 0.695 = 8.00% Minimum Allowable Tolerance = 100% Tol1= 100% 7.8% =

18、92.2% Minimum Allowable EER = 92.2% 14.0 13.993100% + 7.8%BtuW h= 12.91 12.982 BtuW hPart-Load Example in kW/tonRRated Part-Load Performance: Power at 50% Rated Capacity = 35 kW 50% Rated Capacity = 50 tonsRCooling TFL= 10 F kW/tontonR= 35 kW 50 tonsR= 0.700 kW/tonRAllowable Test Tolerance = Tol1= 0

19、.105 (0.07 0.50) + 0.1510 0.50 = 0.10 = 10% Allowable Test Tolerance = Tol1= 0.105 (0.07 0.50) + 0.1510 0.50 = 10.00% Maximum Allowable Tolerance = 100% + Tol1= 100% + 10% = 110% Maximum AllowablekWtonRkW/tonR= 110%(100% + 10%) 0.700 = 0.770 kW/tonR4. Revision to Section C4.3 To determine the range

20、over which the calibration achieves the required accuracy, a linear regression analysis is performed on the calibration data. The data is plotted to show the residual errors versus the calibration reference standard. tThe standard error of estimate shall be calculated for the measurement system indi

21、cated values (post calibration) versus the calibration reference standard, then using equation C1 plot a 95% prediction interval (=5%) on both sides of the calibration data points curve fit. The point(s) at which the prediction interval curve exceeds the required accuracy shall be the limit(s) of th

22、e range. Table C2 and the equations that follow explain the method of calculating the prediction interval. See example using sample data in Figures C1 and C2, in which the specified accuracy is 1% of reading, and the useable range is from 100 to 22.5 13.4, or Turn Down Ratio of 4.4:1 7.5:1. 5. Remov

23、e Table C2, Figures C1 and C2 and replace with revised Table C2, Figures C1 and C2. Table C2. Prediction Interval to Determine Range of Acceptable Accuracy Reference Standard Value 1xjyjj=1 to n Corrected (As Left) Indicated Value 2yjxjj=1 to n Absolute Prediction Interval of Indicated Value Relativ

24、e Prediction Interval of Indicated Value %RDG %FS CalibrationDatax1y1y1x1x1- y PI(x1) 111 ()x y PI xx11()PI xx 1()PI xFS x2y2y2x2x2- y PI(x2) 122 ()x y PI xx22()PI xx 2()PI xFS x3y3y3x3x3- y PI(x3) 133 ()x y PI xx33()PI xx 3()PI xFS xnynynxnxn- y PI(xn) 1 ()nnx y PI xx ()nnPI xx ()nPI xFS Regression

25、Statisticscontinuous curve PI ()x y PI x varying x from min to max values of xjcontinuous curve PI% ()x y PI xxvarying x from min to max values of xj sSSxNotes: 1. Reference Standard Value is the actual value determined or measured by the calibration standard. 2. Corrected Indicated Value is the val

26、ue of the measured quantity given directly by a measuring system on the basis of its calibration curve (“as left” when the calibration process has been completed, not “as found” at the beginning of the calibration process). ( )2,221() 1nxxxPI x s tn SS= + C1 Where: xis a variable representing any me

27、asurement value, such as temperature, flow rate, or power yis the linear regression curve fit of the (xj,yj) calibration data used to compare indicated measurement values versus the calibration reference standardxis any value of x at which to evaluate the curve fit and prediction interval()PI xis th

28、e prediction interval at the value of xFS is the value of x at full scale indicating the upper limit of the measurement range capability of the instrument or measurement system n is the number of calibration data points x is the mean of all measurement values from calibration points xSS is the sum o

29、f squares of x value differences to the mean sis the standard error of estimate, used to quantify the residual error of a measuring system after calibration against a reference calibration standard ( )11njjxxn=C2 ( )21nxjjSS x x= C3 ( )212njjjy mx csn=C4 ( )1 112211n nnjj j jj jjnnjjjjn xy x ymnx x=

30、 = = = C5 ( ) ( )( )21 1 112211n n nnj j j jjj j jjnnjjjjx y x xycnx x= = = = = C6 y mx c= + C7 Where: m = 1 = Slope of regression line due to the calibration processc = 0 = Y-intercept of the regression line due to the calibration process m = Slope of the regression linec = Intercept (offset) of th

31、e regression line ,22nt= The critical value of Students t distribution, at confidence level /2 and degrees of freedom n-2 = 5% = The significance level used by this standard95% = 1- = The prediction interval used by this standardFigure C1. Sample of Relative Calibration Evaluation Data (Percent of R

32、eading) Figure C2. Sample of Absolute Calibration Evaluation Data (Percent of Full Scale) -3.0%-2.0%-1.0%0.0%1.0%2.0%3.0%0 20 40 60 80 100UUTError(%RDG)Reference Standard (units of measure)Corrected Indicated Values95% Prediction IntervalSpecified Accuracy-3.0-2.0-1.00.01.02.03.00 20 40 60 80 100UUT

33、Error (unitsofmeasure)Reference Standard (units of measure)Corrected Indicated Values95% Prediction IntervalSpecified Accuracyi AHRI STANDARD 550/590 (I-P)-2011 WITH ADDENDUM 2 Performance Rating of Water-Chilling and Heat Pump Water-Heating Packages Using the Vapor Compression Cycle June 2013 Adden

34、dum 2 (dated June 2013) of AHRI Standard 550/590 (I-P)-2011, “Changes to AHRI Standard 550/590 (I-P)-2011” is provided as follows. The following changes have been incorporated (deletions are shown by strikethroughs, additions are shown by shading) into the already published 2011 version of AHRI Stan

35、dard 550/590 (I-P) to avoid confusion: Note: This addendum is not ANSI approved and is currently going through the process to do so. The changes include: 1. The effective date of Appendix G was revised. This 2011 standard (as amended by Addenda 1 and 2) supersedes AHRI Standard 550/590 (I-P)-2011 an

36、d shall be effective 1 January 2013 and optional prior to that date. The requirements of Appendix G shall be effective on January 1, 2014 and optional prior to that date. 2. The definition for “Water Pressure Drop” was revised. 3.19 Water Pressure Drop. A measured value of The reduction in static wa

37、ter pressure associated with the flow through a water-type heat exchanger. For this standard, the Water Pressure Drop shall include pressure losses due to nozzles, piping, or other interconnections included with the Water-Chilling or Water-Heating Package and shall include all pressure losses across

38、 the external unit connection points for water inlet and water outlet. This For Published Ratings, this value is expressed in a rating in feet H2O at a reference water temperature of 60F. For test measurements, this is a differential pressure expressed in a psid. (refer to Section 7 for converting u

39、nits of measure). 3. Add new Informative Reference to Appendix B. B1.6 Blake, K.A., “The design of piezometer rings,” Journal of Fluid Mechanics, Volume 78, Part 2, pages 415-428, 1976. 4. “Water” was added to Section C3.1.3.3 C3.1.3.3 Measure Water Pressure Drop across the heat exchanger, psid. 5.

40、Remove Section C3.1.3.3.1 and replace with revised Section C3.1.3.3.1. C3.1.3.3.1 Static pressure taps shall be located external to the unit per Appendix G. Appendix G specifies the acceptable adjustment factors to be used to adjust the pressure drop measurement for external piping between the stati

41、c pressure tap and the unit conversion. vii C3.1.3.3.1 Static pressure taps shall be located per Appendix G. Depending on the design of the chiller water connections, Appendix G may or may not require additional piping external to the unit for accurate measurements. External piping for measurement p

42、urposes creates additional line losses between the static pressure tap and the unit connections. These additional losses are calculated and then subtracted from the raw measurement value as an adjustment method to obtain the reported test result for Water Pressure Drop across the unit connections. A

43、ppendix G specifies the calculation method for adjustment factors. 6. The title of Appendix G was revised. Appendix G. Water Side Pressure Drop Correction Measurement Procedure Normative 65 7. Remove Sections G1, G2 and G3, and replace with revised Sections G1, G2, and G3, including new Sections G4

44、and G5, and new Figures G1 and G2. Figure G1. Examples of Piezometer Ring/Manifold 66 Figure G2. Example of Piezometer Triple-Tee Ring/Manifold 66 Figure G13. Calibration Term for Included Angle for Expansion/Contraction Fittings . 66 G1 Purpose. The purpose of this appendix is to prescribe a method

45、 of compensating for friction losses associated with external piping sections used to determine water-side Water Pressure Drop. G2 Background. As a certified test point for the liquid to refrigerant heat exchangers, the water-side pressure drop needs to be determined by test. Since the measured pres

46、sure drop for this standard will be determined by using static pressure taps external to the unit in upstream and downstream piping, adjustment factors are allowed to compensate the reported pressure drop measurement for the external piping sections. For units with small connection sizes it is felt

47、that straight pipe sections should be connected to the units with adequate spacing to obtain reasonable static pressure measurements. This is the preferred connection methodology. Units with larger size connections may be restricted in the upstream and downstream connection arrangement such that elb

48、ows or pipe diameter changes may be necessary. Numerous studies conclude that the determination of a calculated correction term for these external components may contain significant sources of error and therefore the use of external correction factors will be restricted as follows: G2.1 A requirement of the test arrangement is that the static pressure taps will be in a manifolded arrangement with a minimum of 3 taps located circumferentially around the pipe at equal angle spacing. G2.2 Correction factors will be limited to 10% of the pressure drop reading. G2.3