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eLibrary > >

, 2024

ASHRAE Online Bookstore
Addenda
Errata
ANSI/ASHRAE Standard 41.10-2024 [Go to Page]
Contents
Foreword
1. Purpose
2. Scope [Go to Page]
2.1 This standard applies to the following:
2.2 This standard does not apply to the following:
3. Definitions
4. Classifications [Go to Page]
4.1 Operating Phase During Data Recording
4.2 Refrigerant Flow Measurement Applications. Refrigerant flow measurement applications that are within the scope of this standard shall be classified as one of the types specified in Sections 4.2.1 and 4.2.2:
4.3 Flowmeter Categories
4.4 Refrigerant Volumetric and Mass Flow Rate Measurement Methods. Refrigerant volumetric or mass flow measurement methods that are within the scope of this standard include the refrigerant volumetric or mass flow rate methods that are listed in Tabl...
5. Requirements [Go to Page]
5.1 Test Plan. The test plan shall be one of the following documents:
5.2 Values to be Determined and Reported. The test values to be determined and reported shall be as shown in Table 5-1 if required by the test plan in Section 5.1. Use the units of measure that are shown in Table 5-1 unless otherwise specified in the...
5.3 Test Requirements
6. Instruments [Go to Page]
6.1 Instrumentation Requirements for All Measurements
6.2 Temperature Measurements. If temperature measurements are required by the test plan in Section 5.1, the temperature measurement system accuracy shall be within the following limits unless otherwise specified in the test plan:
6.3 Pressure Measurements
6.4 Time Measurements. Time measurement system accuracy shall be within ±0.5% of the elapsed time measured, including any uncertainty associated with starting and stopping the time measurement unless otherwise specified in the test plan in Section 5...
7. Refrigerant Flowmeter Test Methods [Go to Page]
7.1 Coriolis Flowmeters. Coriolis flowmeters provide direct measurement of gaseous phase, liquid phase, or supercritical phase refrigerant mass flow rates. In a Coriolis flowmeter, the gaseous phase, liquid phase, or supercritical phase of the refrig...
7.2 Thermal Flowmeter. Thermal flowmeters provide direct measurement of gaseous phase, liquid phase, or supercritical phase mass flow rates. The basic elements of the thermal mass flowmeters are two temperature sensors on opposite sides of an electri...
7.3 Volume-Displacement Flowmeters. Both gas or liquid flow rate can be measured accurately using a volume-displacement flowmeter. The quantity of fluid collected during a specified time interval is measured gravimetrically or volumetrically. It foll...
7.4 Orifices, Flow Nozzles, and Venturi Tube Flowmeters. ANSI/ASME PTC 19.5 7 and ANSI/ASME MFC-3M 8 describe measurement of gaseous phase, liquid phase, and supercritical phase flow in pipes using orifices, flow nozzles, and venturi tubes, including...
7.5 Turbine Flowmeters for Gaseous Phase, Liquid Phase, or Supercritical Phase Refrigerant Volumetric Flow Measurements. Turbine flowmeters are volumetric flowmeters that have a turbine rotor suspended on low-friction bearings in the gaseous phase, l...
7.6 Variable-Area Flowmeters for Gaseous Phase, Liquid Phase, or Supercritical Phase Refrigerant Volumetric Flow Measurements. Variable-area flowmeters are volumetric flowmeters that consist of a float that is free to move vertically inside a tapered...
7.7 Ultrasonic Flowmeters for Gaseous Phase, Liquid Phase, or Supercritical Phase Velocity Measurements. Ultrasonic flowmeters measure gaseous phase, liquid phase, or supercritical phase flow velocity by measuring the change in sound frequency of the...
7.8 Vortex-Shedding Flowmeters for Gaseous Phase, Liquid Phase, or Supercritical Phase Refrigerant Velocity Measurements. Vortex-shedding flowmeters are used to determine gaseous phase, liquid phase, or supercritical phase refrigerant velocities. Pie...
7.9 Drag-Force Flowmeters for Liquid Phase or Supercritical Phase Refrigerant Velocity Measurements. Drag-force flowmeters determine liquid phase or supercritical phase refrigerant velocity. Piezoelectric or strain-gage methods are used to sense dyna...
7.10 Magnetic Flowmeters. Magnetic flowmeters are volumetric flowmeters that measure liquid refrigerant flow rates if the refrigerant has a conductivity that is greater than 5 µS/cm. Magnetic flowmeters operate on the principle of Faraday's law of i...
7.11 Positive-Displacement Flowmeters. Positive-displacement flowmeter types are gear, piston, and rotating vane. These flowmeters operate on a geometric principle using a known displacement volume divided by the cycle time to fill and evacuate that ...
8. Lubricant Circulation Rate Measurements [Go to Page]
8.1 Symbols. Table 8-1 defines the symbols used in Section 8.
8.2 Lubricant Circulation Rate Measurement without an Auxiliary Lubricant Separator. Apply the procedures prescribed in ANSI/ASHRAE Standard 41.4 2 to determine the lubricant circulation rate through the flowmeter Cf. Refer to Section 5.3.6 for sampl...
8.3 Lubricant Circulation Rate Measurement with an Auxiliary Lubricant Separator
9. Uncertainty Requirements [Go to Page]
9.1 Post-Test Uncertainty Analysis. A post-test analysis of the measurement system uncertainty, performed in accordance with ANSI/ASME PTC 19.1 1, shall accompany each refrigerant mass flow rate measurement if specified in the test plan in Section 5....
9.2 Method to Express Uncertainty. Assumptions, parameters, and calculations used in estimating uncertainty shall be clearly documented prior to expressing any uncertainty values. Uncertainty shall be expressed as shown in Equation 9-1.
10. Test Report [Go to Page]
10.1 Test Identification
10.2 Unit Under Test (UUT) Description
10.3 Instrument Description
10.4 Measurement System Description
10.5 Test Conditions
10.6 Test Results. Test results are as follows:
11. References
Informative Appendix A: Bibliography
Informative Appendix B: An Uncertainty Analysis Example for a Differential Pressure Flowmeter [Go to Page]
B1. Calculate the Random and Systematic Standard Uncertainties for Each Parameter
B2. Calculate the Random and Systematic Standard Uncertainties of the Working Fluid Density
B3. Calculate and Evaluate the Partial Derivative of the Mass Flow Rate for Each Parameter
B4. Calculate the Random and Systematic Standard Uncertainties of the Mass Flow Rate
B5. Calculate the Combined and Expanded Uncertainties of the Mass Flow Rate
Informative Appendix C: Pressure Compensation Required for an Elevation Difference [Go to Page]
C1. Pressure Compensation Required for an Elevation Difference
C2. Example
Informative Appendix D: Flowmeter Accuracy Comparisons [Go to Page]

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