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ASHRAE Standard 130-2025 -- Laboratory Methods of Testing Air Terminal Units (ANSI/ASHRAE Approved), 2025
- ASHRAE Online Bookstore
- Addenda
- Errata
- Return to Previous Page
- ANSI/ASHRAE Standard 130-2025 [Go to Page]
- Contents
- Foreword
- 1. Purpose
- 2. Scope [Go to Page]
- 2.1 The methods of test in this standard apply to air control devices used in air distribution systems. These devices provide control of air volume with or without temperature change by one or more of the following means and with or without a fan:
- 2.2 This standard covers test methods for use in determining the following performance characteristics:
- 2.3 This standard shall not be used for field testing.
- 3. Definitions and Symbols [Go to Page]
- 3.1 Definitions
- 3.2 Symbols and Subscripts
- 4. Instrumentation [Go to Page]
- 4.1 Calibration Requirements. Measurements from the instruments shall be traceable to primary or secondary standards calibrated by the National Institute of Standards and Technology (NIST) or to the Bureau International des Poids et Mesures (BIPM) if...
- 4.2 Bias Error. Mean bias errors for airflows shall be stated at standard air density as a fractional value of the measured airflow adjusted to standard air density or as an absolute value, whichever is applicable. Mean bias errors for other measurin...
- 4.3 Precision Error. The required precision with a 95% confidence level for the instruments used shall be as follows:
- 4.4 Accuracy. When instrument accuracy is reported without separating out the precision and bias error components, it shall be assumed that “accuracy” means a precision error at a 95% confidence level and the bias error is zero.
- 4.5 Airflow Measuring Instruments
- 4.6 Temperature Measuring Instruments
- 4.7 Pressure Measuring Instruments
- 4.8 Humidity Measuring Instruments
- 4.9 Electrical Measuring Instruments
- 4.10 Acoustical Measuring Instruments
- 5. Test Methods [Go to Page]
- 5.1 General Requirements
- 5.2 List of Tests. Table 2 identifies tests applicable for various types of air terminals.
- 5.3 Minimum Operating Pressure Differential and Loss Coefficient
- 5.4 Mechanical Regulator Minimum Operating Pressure Differential
- 5.5 Pressure-Compensating Volume Controller Performance
- 5.6 Casing Leakage Test
- 5.7 Supply Inlet Damper/Valve Leakage
- 5.8 Exhaust Total Leakage
- 5.9 Dynamic Leakage (Parallel-Flow Fan-Powered)
- 5.10 Airflow Sensor Amplification Factor
- 5.11 Airflow Sensor Performance—Inlet Conditions
- 5.12 Temperature Mixing
- 5.13 Temperature Stratification
- 5.14 Condensation Determination
- 5.15 Sound
- 5.16 Fan Curve—No Primary Air
- 5.17 Fan Curve—Fan Plus Primary Air
- 6. References
- Normative Appendix A: Rotating Vane Anemometer Flow Measuring System [Go to Page]
- A1. General
- A2. Calibration Procedure [Go to Page]
- A2.1 The most convenient and accurate method to calibrate a ducted rotating vane anemometer system is using a flow standard such as a NIST-traceable flowmeter. Components of the meter calibration apparatus (see Figure A-2) are:
- A2.2 The rotating vane anemometer flow station must be constructed to minimize the potential for leakage. The flowmeter and calibrating airflow meter shall be concentric, straight, and level.
- A2.3 The rotating vane anemometer measuring system must be calibrated over its entire range of use.
- A2.4 The goal of the calibration is to create an empirical mathematic equation that relates frequency output from the rotating vane anemometer to flow rate. The rotating vane anemometer typically will have a fixed flow range. Several flowmeters may b...
- Normative Appendix B: Airflow and Air Velocity Equations
- Informative Appendix C: Example: Terminal Unit Loss Coefficient Calculations
- Informative Appendix D: Example: Supply Terminal Unit Leakage Test [Go to Page]
- D1. Example Actual Airflow Calculation
- D2. Example Leakage Parameters Calculation
- Informative Appendix E: Effect of Partially Closed Control Damper on Airflow Sensor Performance [Go to Page]
- E1. Test Purpose
- E2. Test Setup
- E3. Test Procedure [Go to Page]
- E3.1 Vary airflow from minimum to maximum values in increments not exceeding 10% of maximum value with the damper fully open.
- E3.2 Set the airflow rate and inlet static pressure to the values obtained in Section E3.1 with the damper partially closed.
- E4. Test Data
- E5. Calculations [Go to Page]
- E5.1 Air Density. The air density (ρact) in the test area shall be calculated using Normative Appendix J.
- E5.2 Damper Open
- E5.3 Damper Partially Closed
- E5.4 The change in airflow volume shall be reported as the percent difference between the straight inlet condition and the inlet condition with the control damper partially closed, as shown by Equation E-1.
- Informative Appendix F: Example: Mixing Test [Go to Page]
- F1. General
- F2. Fan-Powered Terminal-Unit Test [Go to Page]
- F2.1 Data Acquisition
- F2.2 Calculations
- F2.3 Temperature Mixing Efficiency. Mixing efficiency is 3.6°F (2.0°C), with the primary and induced air temperatures at 55°F (13°C) and 85°F (29°C), respectively (30°F [16°C] differential), with test conditions as follows:
- F3. Dual-Duct Terminal-Unit Test [Go to Page]
- F3.1 Data Acquisition
- F3.2 Calculations
- F3.3 Temperature Mixing Efficiency. Mixing efficiency is 2.6°F (1.4°C) with the hot- and cold-deck air temperatures at 105°F (41°C) and 55°F (13°C), respectively (50°F [28°C] differential), with test conditions as follows:
- Informative Appendix G: Example: Stratification Test [Go to Page]
- G1. General
- G2. Fan-Powered Terminal-unit Test with Reheat Coil [Go to Page]
- G2.1 Data Acquisition
- G2.2 Calculations
- G2.3 Report. The fan-powered terminal unit with reheat stratification is 2.1°F (1.2°C) horizontal and 2.8°F (1.8°C) vertical, with a temperature rise 46.7°F (20.4°C) and test conditions as follows:
- Informative Appendix H: Acoustically Isolated Duct
- Informative Appendix I: Reflection of Airborne Noise at Duct Determinations [Go to Page]
- I1. Informative References
- Normative Appendix J: Time Averaging and Air Density Calculations [Go to Page]
- J1. Time Averaging
- J2. Calculations [Go to Page]
- J2.1 Air Density. The air density ρx at a plane of interest shall be calculated as follows in SI and I-P units, respectively:
- Informative Appendix K: Derivation of Moist Air Density Equation
- Informative Appendix L: Derivation of Air Density Corrections for Airflows Determined Using an Orifice Plate
- Normative Appendix M: Determining Terminal-Unit Casing Leakage Parameters [Go to Page]
- M1. References
- Informative Appendix N: Example: Pressure-Compensating Volume Controller Performance Test
- Normative Appendix O: Test Setup Diagrams for Determining Background Noise for Comparison with Unit Sound Test [Go to Page]
- O1. General
- O2. Procedures [Go to Page]
