ASHRAE 41.10 08:2008 Edition
$50.38
ASHRAE Standard 41.1-2008 Standard Methods for Volatile-Refrigerant Mass Flow Measurements Using Flowmeters (ANSI/ASHRAE Approved)
| Published By | Publication Date | Number of Pages |
| ASHRAE | 2008 | 22 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | FOREWORD FOREWORD 1. PURPOSE 1. PURPOSE 2. SCOPE 2. SCOPE 3. DEFINITIONS 3. DEFINITIONS |
| 5 | 4. CLASSIFICATIONS 4. CLASSIFICATIONS 4.1 Operating State—Gaseous or Liquid 4.1 Operating State—Gaseous or Liquid 4.1.1 Gaseous refrigerant flowmeters can be applied where the entire flow stream of the volatile refrigerant enters and exits in a “vapor-only” state. 4.1.1 Gaseous refrigerant flowmeters can be applied where the entire flow stream of the volatile refrigerant enters and exits in a “vapor-only” state. 4.1.2 Liquid refrigerant flowmeters can be applied where the entire flow stream of the volatile refrigerant enters and exits in a “liquid-only” state. 4.1.2 Liquid refrigerant flowmeters can be applied where the entire flow stream of the volatile refrigerant enters and exits in a “liquid-only” state. 4.2 Flowmeter Operating Principles. The 2005 ASHRAE Handbook — Fundamentals,3 Chapter 14, “Measurements and Instruments,” describes several diverse physical principles that can be used for measuring fluid flow rates. Flowmeters that can be appl… 4.2 Flowmeter Operating Principles. The 2005 ASHRAE Handbook — Fundamentals,3 Chapter 14, “Measurements and Instruments,” describes several diverse physical principles that can be used for measuring fluid flow rates. Flowmeters that can be appl… 5. REQUIREMENTS 5. REQUIREMENTS 5.1 Values to be Determined 5.1 Values to be Determined 5.1.1 Refrigerant mass flow rate, kg/s (lb/h). 5.1.1 Refrigerant mass flow rate, kg/s (lb/h). 5.1.2 Oil circulation rate, percent by mass, if required by the test plan. 5.1.2 Oil circulation rate, percent by mass, if required by the test plan. 5.2 Test Requirements 5.2 Test Requirements 5.2.1 Refrigerant mass flow measurements shall be made at the specified test conditions. When taking multiple measurements at the same test condition, the difference in the individual measurements shall be within the limits specified in the test plan. 5.2.1 Refrigerant mass flow measurements shall be made at the specified test conditions. When taking multiple measurements at the same test condition, the difference in the individual measurements shall be within the limits specified in the test plan. 5.2.2 This standard applies to the measurement of liquid or gaseous refrigerant mass flow rates regardless of the accuracy requirements that are defined in the test plan. Any selected refrigerant flowmeter shall meet (or exceed) the required refriger… 5.2.2 This standard applies to the measurement of liquid or gaseous refrigerant mass flow rates regardless of the accuracy requirements that are defined in the test plan. Any selected refrigerant flowmeter shall meet (or exceed) the required refriger… 5.2.3 The uncertainty in each refrigerant mass flow rate measurement shall be estimated using the methods in Section 9 for every run. Alternatively, the worst-case uncertainty for all runs may be estimated and reported for every run. 5.2.3 The uncertainty in each refrigerant mass flow rate measurement shall be estimated using the methods in Section 9 for every run. Alternatively, the worst-case uncertainty for all runs may be estimated and reported for every run. 5.2.4 The oil circulation rate may adversely affect the accuracy of some flowmeter types. Incorporating an auxiliary oil separator into the test setup may be necessary to reduce the oil circulation rate to an acceptable level. 5.2.4 The oil circulation rate may adversely affect the accuracy of some flowmeter types. Incorporating an auxiliary oil separator into the test setup may be necessary to reduce the oil circulation rate to an acceptable level. 5.2.5 Any lubricant removed from the refrigerant by an oil separator shall be returned to the refrigerant circuit in a manner that does not affect the refrigerant mass flow measurement. 5.2.5 Any lubricant removed from the refrigerant by an oil separator shall be returned to the refrigerant circuit in a manner that does not affect the refrigerant mass flow measurement. 5.2.5.1 If the oil separator is normally applied with the test article, the lubricant from the separator should be returned in the normal way the equipment is applied. 5.2.5.1 If the oil separator is normally applied with the test article, the lubricant from the separator should be returned in the normal way the equipment is applied. 5.2.5.2 If an auxiliary oil separator is required, the lubricant from the auxiliary separator should be returned to the refrigerant circuit at a location downstream of the flowmeter outlet. 5.2.5.2 If an auxiliary oil separator is required, the lubricant from the auxiliary separator should be returned to the refrigerant circuit at a location downstream of the flowmeter outlet. 5.2.6 The ASHRAE refrigerant number for the refrigerant used during these tests shall be obtained from ANSI/ASHRAE Standard 34-2004, Designation and Safety Classification and Refrigerants,1 and stated in the test report. 5.2.6 The ASHRAE refrigerant number for the refrigerant used during these tests shall be obtained from ANSI/ASHRAE Standard 34-2004, Designation and Safety Classification and Refrigerants,1 and stated in the test report. 5.2.7 The source from which refrigerant thermodynamic properties are obtained shall be stated in the test report. The preferred source is NIST Thermodynamic Properties of Refrigerants and Refrigerant Mixtures Database (REFPROP).5 Other sources includ… 5.2.7 The source from which refrigerant thermodynamic properties are obtained shall be stated in the test report. The preferred source is NIST Thermodynamic Properties of Refrigerants and Refrigerant Mixtures Database (REFPROP).5 Other sources includ… 6. INSTRUMENTS 6. INSTRUMENTS 6.1 General 6.1 General 6.1.1 Instruments and data acquisition systems shall be selected to meet the error limits specified in the sections below. 6.1.1 Instruments and data acquisition systems shall be selected to meet the error limits specified in the sections below. 6.1.2 Instrument calibration shall be traceable to primary or secondary standards calibrated by the National Institute of Standards and Technology (NIST) in the United States. Elsewhere, instrument calibration shall be traceable to equivalent organiz… 6.1.2 Instrument calibration shall be traceable to primary or secondary standards calibrated by the National Institute of Standards and Technology (NIST) in the United States. Elsewhere, instrument calibration shall be traceable to equivalent organiz… 6.1.3 Instruments shall be applied and used in accordance with the following standards and codes: 6.1.3 Instruments shall be applied and used in accordance with the following standards and codes: |
| 6 | 6.2 Temperature Measurements. Temperature measurement errors shall be within ±0.28°C (±0.5°F). 6.2 Temperature Measurements. Temperature measurement errors shall be within ±0.28°C (±0.5°F). 6.3 Pressure Measurements 6.3 Pressure Measurements 6.3.1 Pressure measurement errors shall be less than ±1.0% of the reading. If absolute pressure sensors are not used, ensure that the pressure measurement uncertainty calculations include the barometric pressure correction to obtain absolute pressur… 6.3.1 Pressure measurement errors shall be less than ±1.0% of the reading. If absolute pressure sensors are not used, ensure that the pressure measurement uncertainty calculations include the barometric pressure correction to obtain absolute pressur… 6.3.2 Differential pressure measurement errors shall be less than ±1.0% of the reading. 6.3.2 Differential pressure measurement errors shall be less than ±1.0% of the reading. 6.4 Time Measurements. Time measurements shall be within ±0.5% of the elapsed time measured, including any uncertainty associated with starting and stopping the time measurement. 6.4 Time Measurements. Time measurements shall be within ±0.5% of the elapsed time measured, including any uncertainty associated with starting and stopping the time measurement. 6.5 Weight Measurements. Weight measurements shall be within ±0.2% of the weight measured. 6.5 Weight Measurements. Weight measurements shall be within ±0.2% of the weight measured. 7. FLOWMETER TEST METHODS 7. FLOWMETER TEST METHODS 7.1 General. There are many types of commercial meters that can be calibrated to measure mass flow rate for a specific refrigerant over a specific range of either gaseous or liquid operating conditions. There is also a wide range of measurement accur… 7.1 General. There are many types of commercial meters that can be calibrated to measure mass flow rate for a specific refrigerant over a specific range of either gaseous or liquid operating conditions. There is also a wide range of measurement accur… 7.2 Test Apparatus Requirements 7.2 Test Apparatus Requirements 7.2.1 Safety Requirements. Refrigerant flowmeters and all test apparatus shall be constructed and operated in accordance with ANSI/ASHRAE Standard 15-2004, Safety Standard for Refrigeration Systems.12 7.2.1 Safety Requirements. Refrigerant flowmeters and all test apparatus shall be constructed and operated in accordance with ANSI/ASHRAE Standard 15-2004, Safety Standard for Refrigeration Systems.12 7.2.2 Leakage Requirement. The test apparatus shall be leak-checked to ensure that no refrigerant leaves the system during test operations. 7.2.2 Leakage Requirement. The test apparatus shall be leak-checked to ensure that no refrigerant leaves the system during test operations. 7.2.3 Refrigerant Phase Change. Precautions shall be taken to ensure that no refrigerant phase change occurs while test data are being recorded. If the fluid being metered is a liquid, having insufficient pressure downstream of the meter may allow th… 7.2.3 Refrigerant Phase Change. Precautions shall be taken to ensure that no refrigerant phase change occurs while test data are being recorded. If the fluid being metered is a liquid, having insufficient pressure downstream of the meter may allow th… 7.2.4 Material Selections. Flowmeter materials of construction and all other test apparatus materials shall be selected to provide chemical compatibility with the refrigerants and lubricants and to provide suitable structural strength, rigidity, corr… 7.2.4 Material Selections. Flowmeter materials of construction and all other test apparatus materials shall be selected to provide chemical compatibility with the refrigerants and lubricants and to provide suitable structural strength, rigidity, corr… 7.2.5 Installation Considerations. The selected flowmeter shall be installed in accordance with instructions from the equipment manufacturer and/or from other sources of technical information. For example, some flowmeters function properly only if mo… 7.2.5 Installation Considerations. The selected flowmeter shall be installed in accordance with instructions from the equipment manufacturer and/or from other sources of technical information. For example, some flowmeters function properly only if mo… 7.2.6 Provisions for Lubricant Sampling. The test apparatus shall include provisions for extracting refrigerant liquid/ lubricant samples to determine the oil circulation rate if lubricant sampling is required to satisfy the test requirements specifi… 7.2.6 Provisions for Lubricant Sampling. The test apparatus shall include provisions for extracting refrigerant liquid/ lubricant samples to determine the oil circulation rate if lubricant sampling is required to satisfy the test requirements specifi… 7.2.7 Refrigerant System Contaminants. Elements and procedures for controlling refrigerant system contaminants shall be incorporated into the design and construction of the test apparatus. Chapter 6 of the ASHRAE Handbook— Refrigeration13 describes… 7.2.7 Refrigerant System Contaminants. Elements and procedures for controlling refrigerant system contaminants shall be incorporated into the design and construction of the test apparatus. Chapter 6 of the ASHRAE Handbook— Refrigeration13 describes… 7.3 Operating Limits. For the selected meter and the refrigerant used for the tests, operating conditions during flow rate data measurements shall not exceed prescribed limits for pressure, pressure differential, temperature, fluid velocity, or press… 7.3 Operating Limits. For the selected meter and the refrigerant used for the tests, operating conditions during flow rate data measurements shall not exceed prescribed limits for pressure, pressure differential, temperature, fluid velocity, or press… 7.4 Refrigerant Mass Flow Rate Determination. Refrigerant mass flow rate shall be obtained from the display, data acquisition system, or by other means that are appropriate for the particular flowmeter. Except for the Coriolis and thermal mass flowme… 7.4 Refrigerant Mass Flow Rate Determination. Refrigerant mass flow rate shall be obtained from the display, data acquisition system, or by other means that are appropriate for the particular flowmeter. Except for the Coriolis and thermal mass flowme… 7.5 Flowmeter Descriptions 7.5 Flowmeter Descriptions 7.5.1 Volume-Displacement Flowmeters. Either gas or liquid flow rate can be accurately measured using a volume- displacement flowmeter. The quantity of fluid collected during a specified time interval is measured gravimetrically or volumetrically. It… 7.5.1 Volume-Displacement Flowmeters. Either gas or liquid flow rate can be accurately measured using a volume- displacement flowmeter. The quantity of fluid collected during a specified time interval is measured gravimetrically or volumetrically. It… 7.5.2 Coriolis Flowmeters. Coriolis flowmeters are among the most accurate gaseous or liquid refrigerant mass flow measuring devices currently available. Some commercial products offer ±0.10% accuracy for liquid refrigerant measurement or ±0.50% ac… 7.5.2 Coriolis Flowmeters. Coriolis flowmeters are among the most accurate gaseous or liquid refrigerant mass flow measuring devices currently available. Some commercial products offer ±0.10% accuracy for liquid refrigerant measurement or ±0.50% ac… |
| 7 | 7.5.3 Turbine Flowmeters. Turbine flowmeters are volumetric flowmeters that have a turbine rotor suspended on low- friction bearings in the fluid stream. The rotational speed of the turbine is an essentially linear function of the average fluid veloc… 7.5.3 Turbine Flowmeters. Turbine flowmeters are volumetric flowmeters that have a turbine rotor suspended on low- friction bearings in the fluid stream. The rotational speed of the turbine is an essentially linear function of the average fluid veloc… 7.5.4 Orifices, Flow Nozzles, and Venturi Tubes. Orifices, flow nozzles, and venturi tubes are volumetric flowmeters based on a correlation of pressure differential to the volumetric flow of liquids or gases. The American Society of Mechanical Engine… 7.5.4 Orifices, Flow Nozzles, and Venturi Tubes. Orifices, flow nozzles, and venturi tubes are volumetric flowmeters based on a correlation of pressure differential to the volumetric flow of liquids or gases. The American Society of Mechanical Engine… 7.5.4.1 Flowmeter Descriptions. Figure 1 illustrates the application of an orifice metering section, Figure 2 illustrates the application of a flow nozzle, and Figure 3 shows a venturi tube. ASME PTC 19.515 provides construction specifics and pressur… 7.5.4.1 Flowmeter Descriptions. Figure 1 illustrates the application of an orifice metering section, Figure 2 illustrates the application of a flow nozzle, and Figure 3 shows a venturi tube. ASME PTC 19.515 provides construction specifics and pressur… 7.5.4.2 Mass Flow Rate Determination for an Incompressible Fluid. This section defines the procedures for determining the mass flow rate of an incompressible fluid using an orifice, flow nozzle, or venturi tube. Procedures for determining the mass fl… 7.5.4.2 Mass Flow Rate Determination for an Incompressible Fluid. This section defines the procedures for determining the mass flow rate of an incompressible fluid using an orifice, flow nozzle, or venturi tube. Procedures for determining the mass fl… |
| 8 | 7.5.4.3 Mass Flow Rate Determination for Compressible Fluids. When the fluid is a gas and the pressure ratio is p2 / p1 ³ 0.99, the effects of compressibility are negligible and the previous volumetric flow equation can be used. However, when the pr… 7.5.4.3 Mass Flow Rate Determination for Compressible Fluids. When the fluid is a gas and the pressure ratio is p2 / p1 ³ 0.99, the effects of compressibility are negligible and the previous volumetric flow equation can be used. However, when the pr… |
| 9 | 7.5.5 Variable-Area Flowmeters (Rotameters). A variable area flowmeter, or rotameter, commonly consists of a float that is free to move vertically in a transparent tapered tube that has a graduated scale. Chapter 14 of the 2005 ASHRAE Handbook—Fund… 7.5.5 Variable-Area Flowmeters (Rotameters). A variable area flowmeter, or rotameter, commonly consists of a float that is free to move vertically in a transparent tapered tube that has a graduated scale. Chapter 14 of the 2005 ASHRAE Handbook—Fund… 7.5.6 Thermal Mass Flowmeters. Thermal mass flowmeters can be used to measure mass flow rates for both liquids and gases. Some thermal mass flowmeters introduce a known amount of heat into the flowing stream and measure the corresponding temperature … 7.5.6 Thermal Mass Flowmeters. Thermal mass flowmeters can be used to measure mass flow rates for both liquids and gases. Some thermal mass flowmeters introduce a known amount of heat into the flowing stream and measure the corresponding temperature … 7.5.7 Vortex-Shedding Flowmeters. The operating principles for these flowmeters are based on a phenomenon of vortex shedding (the “von Karman effect”) that occurs downstream of an immersed blunt-shaped solid body, as described by Doebelin.18 As t… 7.5.7 Vortex-Shedding Flowmeters. The operating principles for these flowmeters are based on a phenomenon of vortex shedding (the “von Karman effect”) that occurs downstream of an immersed blunt-shaped solid body, as described by Doebelin.18 As t… 7.5.8 Pitot-Static Tube Flowmeters. A pitot-static tube, used in conjunction with a differential pressure transducer, provides a method for determining velocity at a point in a gaseous flow stream (2005 ASHRAE Handbook— Fundamentals3). Arrays of pi… 7.5.8 Pitot-Static Tube Flowmeters. A pitot-static tube, used in conjunction with a differential pressure transducer, provides a method for determining velocity at a point in a gaseous flow stream (2005 ASHRAE Handbook— Fundamentals3). Arrays of pi… 7.5.9 Drag-Force Flowmeters. A body immersed in a flowing fluid is subjected to a drag force given by Equation 7-13. 7.5.9 Drag-Force Flowmeters. A body immersed in a flowing fluid is subjected to a drag force given by Equation 7-13. |
| 10 | 7.5.10 Ultrasonic Flowmeters. Ultrasonic flowmeters, configured as either an in-line type or as a clamp-on type, can be used to measure fluid velocity within a pipe, tube, or conduit. Unlike most other liquid refrigerant flowmeters, a clamp-on type o… 7.5.10 Ultrasonic Flowmeters. Ultrasonic flowmeters, configured as either an in-line type or as a clamp-on type, can be used to measure fluid velocity within a pipe, tube, or conduit. Unlike most other liquid refrigerant flowmeters, a clamp-on type o… 7.5.10.1 Transit-Time Measurement. The transit-time method measures the effects that flow velocity has on bi- directional acoustical signals. An upstream transducer sends a signal to a downstream transducer, which then returns a signal. When there is… 7.5.10.1 Transit-Time Measurement. The transit-time method measures the effects that flow velocity has on bi- directional acoustical signals. An upstream transducer sends a signal to a downstream transducer, which then returns a signal. When there is… 7.5.10.2 Doppler-Effect Measurement. A Doppler- effect ultrasonic flowmeter uses two transducers—one transmits and one receives—to make the flow measurement. The transmitting transducer introduces an acoustical signal into the flow stream at a sp… 7.5.10.2 Doppler-Effect Measurement. A Doppler- effect ultrasonic flowmeter uses two transducers—one transmits and one receives—to make the flow measurement. The transmitting transducer introduces an acoustical signal into the flow stream at a sp… 8. OIL CIRCULATION RATE MEASUREMENTS 8. OIL CIRCULATION RATE MEASUREMENTS 8.1 Oil Circulation Rate Measurement with No Auxiliary Oil Separator 8.1 Oil Circulation Rate Measurement with No Auxiliary Oil Separator 8.1.1 This method shall be used to measure oil circulation rate through the flowmeter when no auxiliary oil separator is included in the test setup. Note that this method utilizes the same calculation methods as are used in ANSI/ASHRAE Standard 41.4-… 8.1.1 This method shall be used to measure oil circulation rate through the flowmeter when no auxiliary oil separator is included in the test setup. Note that this method utilizes the same calculation methods as are used in ANSI/ASHRAE Standard 41.4-… 8.1.2 Oil circulation rate shall be determined by measuring the ratio of the mass of lubricant circulating through a refrigerant system to the total mass of refrigerant and lubricant flowing through the system at a specified set of operating conditions. 8.1.2 Oil circulation rate shall be determined by measuring the ratio of the mass of lubricant circulating through a refrigerant system to the total mass of refrigerant and lubricant flowing through the system at a specified set of operating conditions. 8.1.3 The terms used in this section are defined below. 8.1.3 The terms used in this section are defined below. 8.1.4 The instrument used to measure W1, W2, and W3 shall have a resolution equal to or better than 1% of (W3 – W1) at a loading of W3. 8.1.4 The instrument used to measure W1, W2, and W3 shall have a resolution equal to or better than 1% of (W3 – W1) at a loading of W3. 8.1.5 Evacuate the pressure vessel to be used to take the refrigerant sample. Weigh the vessel along with a clean empty flask, a loose cotton plug in its mouth, and the tube and fitting assembly to be used to connect the vessel to the flask. This is … 8.1.5 Evacuate the pressure vessel to be used to take the refrigerant sample. Weigh the vessel along with a clean empty flask, a loose cotton plug in its mouth, and the tube and fitting assembly to be used to connect the vessel to the flask. This is … 8.1.6 Connect the vessel to the liquid line port on the flowmeter and purge the air from the connecting line. Take a sample of the liquid refrigerant-lubricant mixture when the system is operating at stable operating conditions. In the case of a char… 8.1.6 Connect the vessel to the liquid line port on the flowmeter and purge the air from the connecting line. Take a sample of the liquid refrigerant-lubricant mixture when the system is operating at stable operating conditions. In the case of a char… 8.1.7 Weigh the vessel with the sample along with the flask assembly. This is weight W2. 8.1.7 Weigh the vessel with the sample along with the flask assembly. This is weight W2. 8.1.8 Slowly drain the refrigerant-lubricant mixture from the vessel into the flask using a tube that projects through the cotton and into the mouth of the flask. 8.1.8 Slowly drain the refrigerant-lubricant mixture from the vessel into the flask using a tube that projects through the cotton and into the mouth of the flask. 8.1.9 Slowly remove the refrigerant vapor from the flask using a method that is in compliance with current environmental regulations. 8.1.9 Slowly remove the refrigerant vapor from the flask using a method that is in compliance with current environmental regulations. 8.1.10 Re-weigh the vessel-and-flask assembly. This is weight W3. 8.1.10 Re-weigh the vessel-and-flask assembly. This is weight W3. 8.1.11 The oil circulation rate through the flowmeter shall be calculated using Equation 8-1. 8.1.11 The oil circulation rate through the flowmeter shall be calculated using Equation 8-1. 8.2 Oil Circulation Rate Measurement with an Auxiliary Oil Separator 8.2 Oil Circulation Rate Measurement with an Auxiliary Oil Separator 8.2.1 This method shall be used to determine oil circulation rate when an auxiliary oil separator is included in the test setup. For this case, the total lubricant mass flow rate is equal to the sum of the lubricant circulating through the flowmeter … 8.2.1 This method shall be used to determine oil circulation rate when an auxiliary oil separator is included in the test setup. For this case, the total lubricant mass flow rate is equal to the sum of the lubricant circulating through the flowmeter … 8.2.2 The terms used in this section are defined below. 8.2.2 The terms used in this section are defined below. |
| 11 | 8.2.3 At stable test conditions, the total mass flow rate of lubricant circulation (Mot) shall be determined by measuring the proportion (by weight) of the mass flow of lubricant in the liquid refrigerant being circulated through the flowmeter (Moc) … 8.2.3 At stable test conditions, the total mass flow rate of lubricant circulation (Mot) shall be determined by measuring the proportion (by weight) of the mass flow of lubricant in the liquid refrigerant being circulated through the flowmeter (Moc) … 8.2.4 The means used to measure the rate of lubricant flow (and refrigerant flow) removed by the auxiliary oil separator shall be calibrated within 1% of the measured flow rate. 8.2.4 The means used to measure the rate of lubricant flow (and refrigerant flow) removed by the auxiliary oil separator shall be calibrated within 1% of the measured flow rate. 8.2.5 Procedure and Calculation 8.2.5 Procedure and Calculation 8.2.5.1 Determine the oil circulation rate through the flowmeter (OC) using the method described in Section 8.1. 8.2.5.1 Determine the oil circulation rate through the flowmeter (OC) using the method described in Section 8.1. 8.2.5.2 Determine the mass flow rate of refrigerant through the flowmeter (Mrc) using any of the flowmeter test methods described in this standard. 8.2.5.2 Determine the mass flow rate of refrigerant through the flowmeter (Mrc) using any of the flowmeter test methods described in this standard. 8.2.5.3 Use the product of these parameters to obtain the mass flow rate of lubricant circulating through the flowmeter using Equation 8-2. 8.2.5.3 Use the product of these parameters to obtain the mass flow rate of lubricant circulating through the flowmeter using Equation 8-2. 8.2.5.4 Measure the flow rate of lubricant (and refrigerant) captured by the auxiliary oil separator (Msep). A sight glass should be installed downstream of the measurement location so that the flow can be monitored. This flow shall be in a homogeneo… 8.2.5.4 Measure the flow rate of lubricant (and refrigerant) captured by the auxiliary oil separator (Msep). A sight glass should be installed downstream of the measurement location so that the flow can be monitored. This flow shall be in a homogeneo… 8.2.5.5 Determine the proportion of refrigerant-free lubricant in a liquid sample removed in the oil separator return line using the method described in Section 8.1. Obtain values for W1, W2, and W3. 8.2.5.5 Determine the proportion of refrigerant-free lubricant in a liquid sample removed in the oil separator return line using the method described in Section 8.1. Obtain values for W1, W2, and W3. 8.2.5.6 Calculate the weight fraction of refrigerant-free lubricant in the sample by using Equation 8-3. 8.2.5.6 Calculate the weight fraction of refrigerant-free lubricant in the sample by using Equation 8-3. 8.2.5.7 Calculate the weight fraction of the lubricant- free refrigerant circulating with the lubricant returned from the auxiliary oil separator by using Equation 8-4. 8.2.5.7 Calculate the weight fraction of the lubricant- free refrigerant circulating with the lubricant returned from the auxiliary oil separator by using Equation 8-4. 8.2.5.8 Calculate the auxiliary separator lubricant flow rate by multiplying the measured oil separator flow rate by the weight fraction of lubricant as in Equation 8-5. 8.2.5.8 Calculate the auxiliary separator lubricant flow rate by multiplying the measured oil separator flow rate by the weight fraction of lubricant as in Equation 8-5. 8.2.5.9 Calculate the oil separator refrigerant flow rate by multiplying the measured oil separator flow rate by the weight fraction of lubricant-free refrigerant as in Equation 8-6. 8.2.5.9 Calculate the oil separator refrigerant flow rate by multiplying the measured oil separator flow rate by the weight fraction of lubricant-free refrigerant as in Equation 8-6. 8.2.5.10 The total lubricant flow rate from the test article is the sum of the lubricant flow through the flowmeter plus the lubricant flow from the auxiliary separator, as in Equation 8-7. 8.2.5.10 The total lubricant flow rate from the test article is the sum of the lubricant flow through the flowmeter plus the lubricant flow from the auxiliary separator, as in Equation 8-7. 8.2.5.11 Similarly, the total refrigerant flow is calculated by Equation 8-8. 8.2.5.11 Similarly, the total refrigerant flow is calculated by Equation 8-8. 8.2.5.12 The total oil circulation rate of the test article is the total lubricant flow rate divided by the total refrigerant flow rate as in Equation 8-9. 8.2.5.12 The total oil circulation rate of the test article is the total lubricant flow rate divided by the total refrigerant flow rate as in Equation 8-9. 9. UNCERTAINTY CALCULATIONS 9. UNCERTAINTY CALCULATIONS |
| 12 | 10. TEST REPORT 10. TEST REPORT 10.1 Test Identification 10.1 Test Identification 10.2 Test Article Description 10.2 Test Article Description 10.3 Flowmeter Description 10.3 Flowmeter Description 10.4 Ambient Conditions 10.4 Ambient Conditions 10.5 Test Conditions 10.5 Test Conditions 10.6 Test Results 10.6 Test Results 11. REFERENCES 11. REFERENCES |
| 13 | Recommended Method to Express Uncertainty Recommended Method to Express Uncertainty Uncertainty Calculation Procedure Uncertainty Calculation Procedure |
| 15 | Calibration Error Estimate Calibration Error Estimate Data Acquisition Error Estimate Data Acquisition Error Estimate Data Reduction Error Estimate Data Reduction Error Estimate |
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