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ASHRAE Standard 113-2022 -- Method of Testing for Room Air Diffusion (ANSI Approved), 2022
- ANSI/ASHRAE Standard 113-2022 [Go to Page]
- Contents
- Foreword
- 1. Purpose
- 2. Scope [Go to Page]
- 2.1 This standard specifies equipment and procedures for measuring air speed and air temperature in occupied zones of building spaces.
- 2.2 This standard applies to furnished or unfurnished spaces (actual or mock-up), with or without occupants.
- 2.3 This standard applies to air distribution systems, including systems in which
- 2.4 This standard does not cover
- 3. Definitions
- 4. Classification Of Parameters [Go to Page]
- 4.1 The classification of air distribution systems to which this standard may be applied includes mixing systems, displacement ventilation (DV) systems, underfloor air distribution (UFAD) systems, and task/ambient conditioning (TAC) systems.
- 4.2 Air temperature and air speed are the only variables measured and assumed to be pertinent to the test methods described in this standard.
- 5. Instruments And Apparatus [Go to Page]
- 5.1 Air Motion
- 5.2 Air Temperature
- 5.3 Heat Load Simulators
- 6. Test Conditions And Procedures [Go to Page]
- 6.1 Testing shall be conducted under steady-state conditions after the reference temperature is within 2°F (1°C) of the design temperature. Steady-state conditions are considered to have been achieved when the air quantity delivered to the space do...
- 6.2 The following test procedure shall be followed.
- 7. Measurements And Measurement Locations [Go to Page]
- 7.1 A fixed point in the test zone shall be selected as the reference temperature measurement point. The air temperature at this point shall be measured at the same time as each set of measurements are taken at each test position throughout the durat...
- 7.2 At each measurement point, the air speed and air temperature shall be recorded for a minimum period of 3 minutes at a sampling interval of 2 to 4 seconds. These results shall be used to determine mean air speed and mean air temperature.
- 7.3 Velocity and temperature measurements shall be taken in a series of test positions. A minimum of four test positions shall be uniformly distributed throughout the test zone, with a minimum spacing of 2 ft (0.6 m) and a maximum spacing of 6 ft (1....
- 7.4 For UFAD and task/ambient conditioning TAC systems, test positions within clear zones shall not be included in the rating evaluation. The reference temperature measurement point shall not be located within any clear zone. Otherwise, the measureme...
- 7.5 If test locations are desired that do not comply with Sections 7.3 or 7.4 (i.e., velocity and temperature measurements within 2 ft [0.6 m] of a vertical surface), additional detail must be provided in the test report explaining the exact location...
- 8. Report [Go to Page]
- 8.1 The report shall include a sketch defining the dimensions of the test space, the location of the occupied zone, the location(s) of the test zone(s), the size and locations of the air outlets and inlets, test planes and test positions, the heat lo...
- 8.2 The report shall include the following calculated and measured data.
- 9. Normative References
- Informative Appendix A: Data Collection and Recommended Calculations [Go to Page]
- A1. Temperature Correction [Go to Page]
- A1.1 All reference temperatures recorded should be averaged to obtain the average temperature at the reference point during the test.
- A1.2 At each reading of temperatures at a test position, the reference point temperature should be compared to the average reference temperature to determine a temperature correction factor to be applied to all test- point temperatures at that test p...
- A1.3 The test-position temperature correction factor should be added to all corresponding test-point temperatures. This procedure corrects the test-point temperature for any swing in the reference temperature.
- A1.4 The same corrections should be made to the air supply outlet temperatures measured concurrent with the test-position temperatures.
- A2. Average Test Zone Temperature
- A3. Effective Draft Temperature
- A4. Average Supply Air Outlet Temperature
- A5. Average Exhaust Air Outlet Temperature
- A6. Temperature Effectiveness
- A7. Test Zone Apparent Load
- Informative Appendix B: Rating Methods [Go to Page]
- B1. Air Diffusion Performance Index for Cooling
- B2. Air Diffusion Performance Index for Heating
- B3. Performance Evaluation for Stratified Systems [Go to Page]
- B3.1 Description of the Clear Zone. During the placement of floor diffusers for UFAD systems, a clear zone is typically defined as an imaginary cylinder of specified radius around the center point of the diffuser. Clear zones are generally 1.5 to 3 f...
- B3.2 Recommended Limits for Clear Zone. If an occupant will work within a clear zone (UFAD and TAC systems only), verification that the occupant can control the diffuser over an adequate range must be obtained. The definition of what constitutes an a...
- Informative Appendix C: Example Calculations [Go to Page]
- C1. Performance Evaluation of Mixing Systems for Cooling (ADPI Method, I-P)
- C2. Performance Evaluation of Mixing Systems for Cooling (ADPI Method, SI)
- C3. Performance Evaluation of Mixing Systems for Heating (ADPI Method, I-P)
- C4. Performance Evaluation of Mixing Systems for Heating (ADPI Method, SI)
- Informative Appendix D: Example Calculations [Go to Page]
- D1. Compliance Alternative 1 [Go to Page]
- D1.1 For overhead mixed cooling conditions, the ADPI should be equal to or greater than 80%, and the test zone average air velocity, Vac, should not exceed the value described in ASHRAE Standard 55 G1, Figure 5.3.3B, or ISO 7730 G2, whichever is greater
- D1.2 For overhead mixed heating conditions, the ADPI should be equal to or greater than 80%, and the test zone average air velocity, Vac, should not exceed the value described in ASHRAE Standard 55G1, Figure 5.3.3B, or ISO 7730G2, whichever is greate...
- D2. Compliance Alternative 2 [Go to Page]
- D2.1 It may be desirable to determine compliance with thermal comfort requirements established in ASHRAE Standard 55 G1 or ISO 7730 G2. If so, the following additional measurements or calculations are required to obtain the necessary data:
- D3. Compliance Alternative 3 [Go to Page]
- D3.1 The measurement of mean radiant temperature and water vapor partial pressure are required to calculate predicted mean vote (PMV) and predicted percentage of dissatisfied (PPD) in accordance with ASHRAE Standard 55 G1 and ISO 7730 G2.
- Informative Appendix E: Rotating Vane Anemometer Flow Measuring System [Go to Page]
- E1. General [Go to Page]
- E1.1 The rotating vane anemometer flow measuring system consists of a straight length of duct with a rotating vane anemometer, humidity measuring instrument, and a temperature probe (see Figure E-1). Optionally, a backpressure regulating device can b...
- E1.2 When constructing the rotating vane anemometer flowmeter, locate the rotating vane anemometer within 0.16 equivalent diameters of the center of the duct.
- E2. Calibration Procedure [Go to Page]
- E2.1 The most convenient and accurate method to calibrate a ducted rotating vane anemometer system in place is by using a flow standard such as a NIST-traceable flowmeter (see Figure E-2). Following is a list of components to be used for calibrating ...
- E2.2 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.
- E2.3 The rotating vane anemometer measuring system must be calibrated over its entire range of use.
- Informative Appendix F: Equations [Go to Page]
- F1. Air Density [Go to Page]
- F1.1 The saturated vapor pressure, pe (in. Hg) is calculated using the Hyland-Wexler equation, Equation F-1 G11:
- F1.2 The partial vapor pressure, pp (in. Hg), is calculated by Equation F-2:
- F1.3 The air density, ρo (lbm/ft3) [(kg/m3)], at ambient conditions is calculated by Equation F-3:
- F2. Mass Flow Rate [Go to Page]
- F2.1 Mass flow rate, (lbm/h [kg/h]), is calculated using Equation F-4:
- F3. Standard Volumetric Airflow Rate [Go to Page]
- F3.1 Standard volumetric flow rate, Qstd (ft3/min [L/s]), is calculated using Equation F-5:
- F4. Velocity [Go to Page]
- F4.1 Air velocity, V (ft/min [m/s]), is calculated using Equation F-6:
- F5. Velocity Pressure [Go to Page]
- F5.1 Velocity pressure, pv (in. of water [Pa]), is calculated using Equation F-7:
- Informative Appendix G: Informative References [Go to Page]
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