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ASHRAE Standard 200-2024 -- Methods of Testing Chilled Beams (ANSI Approved), 2024
- ASHRAE Online Bookstore
- Addenda
- Errata
- ANSI/ASHRAE Standard 200-2024 [Go to Page]
- Contents
- Foreword
- 1. Purpose [Go to Page]
- 1.1 To define laboratory methods of testing chilled beams to determine performance.
- 2. Scope [Go to Page]
- 2.1 Defines laboratory methods of testing chilled beams to determine performance.
- 2.2 Specifies test instrumentation, facilities, installation methods, and procedures for determining the performance of chilled beams.
- 3. Definitions and Symbols [Go to Page]
- 3.1 Definitions
- 3.2 Symbols
- 4. Instrumentation and Facilities [Go to Page]
- 4.1 All instruments shall have been calibrated in the range of use within the past year to a NIST-traceable or equivalent organization standard.
- 4.2 Temperature and moist air properties measuring instruments shall meet the requirements of ASHRAE Standard 41.11 and ASHRAE Standard 41.62 and the following subsections.
- 4.3 Pressure measuring instruments shall meet the requirements of ANSI/ASHRAE Standard 41.33 and the requirements of Section 4.3.1.
- 4.4 Primary Airflow Measurement
- 4.5 Water Flow Rate Measurement
- 4.6 Sound Power Measurement
- 4.7 Discharge Air Jet Performance Measurement. Used for throw measurements (see Section 5.7.5).
- 4.8 Water-Side Cooling Capacity Measurement
- 5. Test Methods [Go to Page]
- 5.1 Acoustics
- 5.2 Physical Requirements for Water-Side Cooling Capacity
- 5.3 Test Setup Requirements
- 5.4 Testing Requirements
- 5.5 Test Procedures
- 5.6 Definition of Steady State
- 5.7 Calculations and Expression of Results
- 6. Reporting
- 7. Normative References
- Informative Appendix A: Governing Equations for Chilled Beams [Go to Page]
- A1. Total Cooling Capacity
- A2. Coil-Cooling Capacity
- A3. Coil Heat-Transfer Coefficient
- A4. Measuring Induction Coefficient, Kin
- A5. Measurement of the Induction Coefficient by the Zero-Pressure Method
- Informative Appendix B: Primary Airflow Measurement [Go to Page]
- B1. Primary Airflow Measurement [Go to Page]
- B1.1 Airflow rate shall be measured in accordance with ASHRAE Standard 41.2H1. Alternative airflow rate measurement methods may be used if calibrated with a certified standard to the required accuracy.
- B2. Orifice Meters [Go to Page]
- B2.1 Orifice meters shall be constructed in accordance with ASME Performance Test Code 19.5H2 and shall be sized for a throat velocity not less than 3000 fpm (15 m/s) or more than 7000 fpm (35 m/s).
- B3. Multiple Nozzle Chamber Meter [Go to Page]
- B3.1 Multiple nozzle chamber meters shall be constructed in accordance with ANSI/ASHRAE Standard 51 (ANSI/AMCA 210)H3.
- B4. Vane Anemometer Flow Measuring System [Go to Page]
- B4.1 One method of accurately measuring airflow rates with low pressure drop is to use a vane anemometer that has been calibrated in situ against a certified standard to the required accuracy.
- B4.2 The vane anemometer flow measuring system consists of a straight length of duct with a propeller anemometer, humidity measuring instruments, and a temperature probe inside (see Figure B-1). The duct has five diameters of inlet length, a flow str...
- B4.3 Vane Anemometer Flowmeter Calibration Procedure
- Informative Appendix C: Electric Heated Person Simulators [Go to Page]
- C1. Purpose
- C2. Simulator Construction
- C3. Test Room Placement Of Simulators
- C4. Internal Heat Load Selection
- Informative Appendix D: Radiant Shielded Temperature Sensor [Go to Page]
- D1. Purpose
- D2. Design Considerations
- Normative Appendix E: Laboratory Measurement Of Induced Airflow Rates And Calculation Of Induction Ratios [Go to Page]
- E1. Measurement by the Induction Velocity Method [Go to Page]
- E1.1 Induced Air Velocity Measurement
- E1.2 Test Sample Qualification and Locations
- E1.3 Measurement Requirements and Locations
- E1.4 Testing Requirements
- E1.5 Test Procedures
- E1.6 Calculation and Expression of Results
- E2. Measurement by the Thermal Balance Method [Go to Page]
- E2.1 Temperature Measurement of Induced Air after Leaving the Cooling Coil
- E2.2 Measurement Requirements and Locations
- E2.3 Testing Requirements
- E2.4 Test Procedures
- E2.5 Calculation and Expression of Results
- Normative Appendix F: Method Of Testing Water Pressure Drop [Go to Page]
- F1. Method of Testing Water Pressure Drop [Go to Page]
- F1.1 The temperatures and pressures of water entering and leaving the chilled beam shall be measured by the apparatus as illustrated in Figure F-1. The connecting piping shall be the same size as the chilled-beam supply and return connections.
- F1.2 Temperature measuring instruments shall be placed so as to measure the temperature of the water entering and leaving the beam. The liquid lines shall be insulated at and adjacent to the temperature measuring instruments. Appropriate insulation h...
- F1.3 Appropriate means shall be provided for determining the liquid absolute pressure entering the beam and the liquid pressure drop through the beam and measurement apparatus, as shown in Figure F-1. The piezometer rings shall be located and constru...
- F1.4 The pressure drop in the test measurement apparatus, including any pipe between the beam and the measuring devices, at the test flow shall be calculated and subtracted from the measurement. This piping loss shall be determined by calibration of ...
- Normative Appendix G: Water-side Pressure Drop Measurement Procedure [Go to Page]
- G1. Purpose
- G2. Background
- G3. Measurement Locations [Go to Page]
- G3.1 Static pressure taps may be in either the unit connections (i.e., nozzles) or in additional external piping provided for the purpose of test measurements.
- G3.2 If using additional external piping, the piping arrangement shall use rigid pipe and may include fittings such as elbows, reducers, or enlargers between the pressure tap locations and the unit connections. Flexible hose is prohibited between the...
- G3.3 Static pressure taps shall maintain the lengths of cylindrical straight pipe in the flow path adjacent to each pressure tap location as shown in Table G-1.
- G4. Static Pressure Taps [Go to Page]
- G4.1 For design or evaluation purposes, flow resistance may be estimated by resistance coefficient K-factor calculation methods, as found in Crane Technical Paper No. 41010. Generally, manifold tubing or piping can be evaluated using the K-factor, an...
- G4.2 Provisions shall be made to bleed air out of the lines connected to pressure measurement devices. These provisions shall take into consideration the orientation of pressure taps and manifold connections.
- G5. Correction Method [Go to Page]
- G5.1 The adjustment shall not exceed 10% of the measured water pressure drop.
- G5.2 The general form of the adjustment equations use the methods in Crane Technical Paper No. 41010. A Darcy friction factor is determined using the Swamee-Jain equation.
- G5.3 An Excel® spreadsheet is available from AHRI for computation of the pressure drop adjustment factors.
- G6. Pressure Measurement Pipe Calibration [Go to Page]
- G6.1 Connect the entering beam pressure measurement pipe exit (minimum straight length downstream of taps = 3 × Di or 6 in. [150 mm], whichever is greater) to the leaving beam pressure measurement pipe entrance (minimum straight length upstream of t...
- G6.2 The instrumentation for the test shall consist of the following:
- G6.3 Data to be recorded for each test run is as follows:
- G6.4 Conduct the water pressure drop test with at least four different water velocities inside pressure measurement pipe covering the range of 1 to 14 ft/s (0.3 to 4.25 m/s) in approximately equally spaced velocity increments on a logarithmic scale. ...
- G6.5 Record the test data continuously for at least 30 minutes (every 1 minute) after steady-state condition has been achieved. Average the rounds to determine each run’s test values. Wait for steady-state conditions before testing at the next wate...
- G6.6 Use the following input data and the AHRI spreadsheet to calculate water pressure drop through entering beam and leaving beam pressure measurement pipes at the test input conditions.
- G6.7 The measurement shall not exceed the calculated adjustment by more than 10%; otherwise, additional corrections shall be applied and noted.
- G6.8 If the pressure measurement pipes are made from a noncorroding material, and the water under test is soft, the pipe’s absolute roughness should not change as a function of time.
- G6.9 The laboratory shall conduct an annual calibration of the pressure measurement pipes.
- Informative Appendix H: Informative References [Go to Page]
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