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ASHRAE 41.9 11:2011 Edition

ASHRAE 41.9 11:2011 Edition

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ANSI/ASHRAE Standard 41.9-2011 Standard Methods for Volatile-Refrigerant Mass Flow Measurements Using Calorimeters

Published By Publication Date Number of Pages
ASHRAE 2011 24
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Originally published in 1989, Standard 49.1 provides recommended practices for measuring the mass flow rate of volatile refrigerants using calorimeters and applies to all refrigerants listed in ANSI/ASHRAE Standard 34. This most recent revision of Standard 49.1 includes updated references and citations, procedural revisions, and additional updates that bring the standard into compliance with ASHRAE’s mandatory language requirement. Additional minor changes improve usability and readability.

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PDF Pages PDF Title
1 ANSI/ASHRAE Standard 41.9-2011
4 FOREWORD
1. PURPOSE
2. SCOPE
2.1 This standard applies to the measurement of the flow of a volatile refrigerant in the following cases:
2.2 This standard applies to all of the refrigerants listed in ANSI/ASHRAE Standard 34, Designation and Safety Classification of Refrigerants.1
3. DEFINITIONS
5 4. CLASSIFICATIONS
4.1 Calorimeters. Calorimeters that are within the scope of this standard are classified either as evaporator calorimeters or as condenser calorimeters.
4.2 Refrigerant Blends. Volatile refrigerant blends can be classified as being azeotropic or zeotropic. For zeotropic refrigerants, the temperature glide shall be accounted for in all determinations of liquid subcooling and vapor superheat. Zeotropic…
5. REQUIREMENTS
5.1 Values to be Determined
5.2 Test Requirements
6 Figure 1 Pressure-enthalpy diagram.
5.3 Safety Requirements. All calorimeters shall meet design requirements for safety as defined in ANSI/ASHRAE Standard 15, Safety Standard for Refrigeration Systems.5 Some specific additional safety precautions are included in later sections of this …
6. INSTRUMENTS
6.1 General
6.2 Temperature Measurements. Temperature measurement errors shall be within the following limits:
6.3 Pressure Measurements. Pressure measurement errors shall be less than ±1.0%. If absolute pressure sensors are not used, ensure that the pressure measurement uncertainty calculations include the barometric pressure correction in order to obtain a…
6.4 Electrical Measurements. Electrical power measurement errors shall be within ±1.0% of the quantity measured. Electrical power measurements shall be made at such a location that the instrumentation can accurately measure the power input.
6.5 Water or Brine Flow Measurements. Water or brine flow rates shall be measured within ±1.0% of the quantity measured.
6.6 Time Measurements. Time measurements shall be within ±0.5% of the elapsed time measured. This accuracy shall include any uncertainty errors associated with starting and stopping the measurement.
6.7 Weight Measurements. Weight measurements shall be within ±0.2% of the weight measured.
7 7. SECONDARY REFRIGERANT CALORIMETER METHOD
7.1 Equipment Description and Initial Steps
Figure 2 Secondary refrigerant calorimeter.
7.2 Equipment Adjustments and Operating Limits
8 7.3 Calculations
8. SECONDARY FLUID CALORIMETER METHOD
8.1 Equipment Description and Initial Steps
Figure 3 Secondary fluid calorimeter.
9 8.2 Equipment Adjustments and Operating Limits
10 8.3 Calculations
9. PRIMARY REFRIGERANT CALORIMETER METHOD
9.1 Equipment Description and Initial Steps
11 Figure 4 Primary refrigerant calorimeter.
9.2 Equipment Adjustments and Operating Limits
12 9.3 Calculations
10. CONDENSER CALORIMETER METHOD
10.1 Equipment Description and Initial Steps
Figure 5 Condenser calorimeter.
10.2 Equipment Adjustments and Operating Limits
13 10.3 Calculations
11. LUBRICANT CIRCULATION MEASUREMENTS
11.1 Lubricant Circulation Measurement with No Auxiliary Lubricant Separator
14 11.2 Lubricant Circulation Measurement with an Auxiliary Lubricant Separator
Figure 6 Auxiliary lubricant separator.
15 12. UNCERTAINTY CALCULATIONS
12.1 For the secondary refrigerant calorimeter method and the primary refrigerant calorimeter method:
12.2 For the secondary fluid calorimeter method:
12.3 For the condenser calorimeter method:
12.4 Parameters used in Sections 12.1–12.3 are defined as follows.
16 13. TEST REPORT
13.1 Test Identification
13.2 Test Article Description
13.3 Calorimeter Description
13.4 Ambient Conditions
13.5 Test Conditions
13.6 Test Results
17 14. REFERENCES
INFORMATIVE APPENDIX A— Error Analysis for an Evaporator Calorimeter
18 Comments
19 INFORMATIVE APPENDIX B— Example of Uncertainty Estimate for a Secondary Refrigerant Calorimeter or a Primary Refrigerant Calorimeter
TABLE B1 Test Data for Appendix B Example
20 INFORMATIVE APPENDIX C— Example of an Uncertainty Estimate for a Condenser Calorimeter
21 TABLE C1 Test Data for Appendix C Example

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