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ASHRAE 113 2013

ASHRAE 113 2013

$38.46

ASHRAE Standard 113-2013 Method of Testing for Room Air Diffusion (BSR/ASHRAE/ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2013 18
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ANSI/ASHRAE Standard 113-2013 defines a repeatable method of testing the steady-state air diffusion performance of an air distribution system in occupied zones of building spaces based on air velocity and air temperature distributions at specified heating or cooling loads and operating conditions.

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PDF Pages PDF Title
4 FOREWORD
1. PURPOSE
2. SCOPE
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
5 4. CLASSIFICATION OF PARAMETERS
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, air speed, and turbulence intensity are the only variables measured and assumed to be pertinent to the test methods described in this standard.
5. INSTRUMENTS AND APPARATUS
5.1 Air Motion. The room air motion shall be determined by air velocity measurements. The air velocity is a quantity defined by its magnitude and direction. The magnitude of the velocity vector of the flow at the measuring point is the speed, V, whic…
6 5.2 Air Temperature. The minimum requirements for the characteristics of the temperature measuring instruments are given in Table 1. Care should be taken to protect the sensor from any influence of thermal radiation from neighboring heat sources, sun…
TABLE 1 Minimum Requirements for the Characteristics of Velocity and Temperature Measuring Instruments
7 5.3 Heat Load Simulators. To simulate the heat produced by the occupants and equipment in a space, it may be necessary to provide a heat load into the space (and surrounding areas) where air diffusion tests are being conducted with cold air in order …
6. TEST CONDITIONS AND PROCEDURES
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 should be followed.
7. MEASUREMENTS AND MEASUREMENT LOCATIONS
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 three minutes. The results are to be used to determine mean air speed, mean air temperature, and turbulence intensity. To determine mean air te…
7.3 If an omnidirectional probe is not used, the probe will require orientation in at least three directions to ensure measurement of the primary air currents. The highest velocity of the three measurements shall be used as the mean air speed.
7.4 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….
7.5 For UFAD and 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 measurement point and test position…
8. REPORT
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.
8 9. REFERENCES
INFORMATIVE AnneX A— DATA COLLECTION AND RECOMMENDED CALCULATIONS
A1. Temperature Correction
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 po…
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
9 A3. Effective Draft Temperature
A4. Average Supply Air Outlet Temperature
A5. Test Zone Apparent Load
INFORMATIVE Annex B— RATING METHODS
B1. Air Diffusion Performance Index
B2. Draft Rating Method
10 Figure B.2.1 Maximum allowable local mean air speed as a function of local air temperature and turbulence intensity for (a) DR = 10% and (b) DR = 20%, corresponding to 10% and 20% of occupants dissatisfied due to draft, respectively.
Figure B.2.2 Maximum allowable local mean air speed as a function of local air temperature and turbulence intensity in rooms with (a) displacement (Tu = 20%) and (b) mixing ventilation (Tu = 40%).
11 B3. Performance Evaluation for Stratified Systems
B4. REFERENCES
12 INFORMATIVE annex C— EXAMPLE CALCULATIONS
C1. Performance Evaluation of Mixing Systems (ADPI Method)
TABLE C.1 Performance Evaluation of Mixing Systems (ADPI Method)
TABLE C.1.1 Temperature Correction Time-Averaged Reference Temperature = Tr = (73.1 +72.9 + 72.2 + 72.4 + 72.2 + 72.4 + 70.8 + 72.0 + 71.6) / 9 = 72.1 Temperature Correction Factor = Dtrm = Tr – trm
13 TABLE C.1.2 Corrected Test Point Temperature = tacn = tan – Dtrm
TABLE C.1.3 Average Test Zone Temperature = tac = (tac1 +tac2 + tac3 + …tacn)/n = 72.1 Effective Draft Temperature = qn = (tacn – tac) – 0.07(van – 30)
C2. Performance Evaluation Using the Draft Rating Method
14 TABLE C.2.1 Example of Mean Air Speeds and Temperatures Measured in a Room with Mixing Ventilation and Calculated DR Based on Tu = 40%
INFORMATIVE annex D— COMPLIANCE
D1. Compliance Alternative 1
15 D2. Compliance Alternative 2
D3. Compliance Alternative 3
D4. REFERENCES
INFORMATIVE AnneX E— BIBLIOGRAPHY

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ASHRAE 113 2013
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