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ASHRAE Standard 164.4 2021

ASHRAE Standard 164.4 2021

$38.46

ASHRAE Standard 164.4-2021 — Methods of Test for Commercial and Industrial Adiabatic Humidifiers (ANSI Approved)

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ASHRAE 2021
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ASHRAE Standard 164.4 establishes a uniform method of laboratory performance testing of commercial and industrial adiabatic humidifiers. Information resulting from the application of this method of test is intended for use by manufacturers, specifiers, installers, and users of commercial and industrial humidifiers.

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PDF Pages PDF Title
1 ANSI/ASHRAE Standard 164.4-2021
3 CONTENTS
4 FOREWORD
1. PURPOSE
2. SCOPE
2.1 This standard describes a method of test for the humidification rate and evaporation efficiency of commercial and industrial adiabatic humidifiers as defined in Section 3.
2.2 This method of test describes the test apparatus, conduct of the test, and information to be recorded.
2.3 Information resulting from the application of this method of test is intended for use by manufacturers, specifiers, installers, and users of commercial and industrial humidifiers.
3. DEFINITIONS
5 4. UNITS OF MEASUREMENT
4.1 Systems of Units. The International System of Units (le Systeme International d’Unites) 1 is employed in this standard. Values shall be based on the National Institute of Standards and Technology (NIST) values that, in turn, are based on the fu…
4.2 Basic Units. The unit of length is either the metre (foot) designated “m” (“ft”) or the millimetre (inch), designated “mm” (“in.”). The unit of mass is the kilogram (pound mass), designated “kg” (“lb”). The unit of time is…
5. INSTRUMENTATIONS AND METHODS OF MEASUREMENT
5.1 Calibration. 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 a National M…
5.2 Nozzle Apparatus. Each nozzle station consists of a receiving chamber and a discharge chamber separated by a partition where one or more nozzles of equal or unequal size are located.
5.3 Air Flow Volume. For humidifiers intended to be installed within an air duct, an airflow measuring apparatus is shown schematically in Figure 1. The airflow rate shall be determined by measuring the pressure differential across elliptical flow no…
6 5.4 Air Temperature. Both wet- and dry-bulb air temperatures shall be measured in accordance with ANSI/ASHRAE Standard 41.1, Standard Method for Temperature Measurement 3 and Standard 41.6, Standard Methods for Humidity Measurement 4. A measurement a…
5.5 Water Flow. Water flow shall be measured using a totalizing water meter connected to the humidifier inlet and a timing device to determine the rate of water flow. Water meters shall have an accuracy of ±5.0% of observed reading.
5.6 Water Temperature. Water and fluid temperature shall be measured using a submerged well, an insulated wrap of the supply line, or any other method with a demonstrated accuracy of 0.5°C (1.0°F) or better.
5.7 Water Conductivity Measurements. Water conductivity measurements, if required by the manufacturer, shall be measured using a conductivity meter having an accuracy ±1.0 μS/cm of observed reading.
5.8 Barometric Pressure. The barometric pressure shall be measured with a mercury column barometer or other instrument and shall have an accuracy of ±34 Pa (0.01 in. Hg) and with scale divisions less than or equal to 34 Pa (0.01 in. Hg). Test shall …
5.9 Air and Water Pressure Measurement. Other than barometric pressure, static pressure in ducts or chambers shall be measured with taps designed to eliminate velocity effects. Each location requiring a static pressure measurement shall use a minimum…
5.10 Relative Humidity. Relative humidity shall be calculated from the dry-bulb temperature, wet-bulb temperature, and barometric pressure or read directly from a humidity measuring device that has a demonstrated accuracy of ±1%.
5.11 Chronometer. A timepiece that displays time in seconds and keeps time accurate to within ±2 min per day shall be used for all time measurements. Calibration is not necessary.
5.12 Electrical Voltage. Voltage shall be measured using a voltmeter connected to the humidifier over the duration of the test. Voltmeters shall have an accuracy of ±1.0% of the observed reading.
5.13 Power Measurement. Power shall be measured using a wattmeter connected to the humidifier over the duration of the test. Wattmeters shall have an accuracy of ±1.0% of the observed reading.
5.14 Electrical Energy Measurement. Energy shall be measured using a watt-hour meter connected to the humidifier over the duration of the test. Watt-hour meters shall have an accuracy of ±1.0% of the observed reading.
6. EQUIPMENT AND SETUP
6.1 Air Treatment Facilities. The test facility shall be provided with air-treating equipment to maintain the prescribed conditions of temperature, humidity, and pressure within the test area.
8 6.2 Duct-Mounted Humidifier Test Stand. Adiabatic humidifier and instrumentation shall be installed in a test chamber as shown in Figure 1. Waste or drain water from the humidifier shall be collected in a waste-water tank placed on a scale as shown i…
6.3 Area-Type Humidifier Test Stand. For area type humidifiers with affixed tanks that require manual filling and do not have a connection to supply water, the test stand shown in Figure 2 shall be utilized. With this arrangement, the humidifier is p…
6.4 Temperature Measuring. Air temperature measurements and fluid temperature measurements shall be made in accordance with the applicable provisions of ASHRAE Standards 41.1 3 and 41.6 4.
7. CONDUCT OF TEST
7.1 Conditions of Test. The following conditions shall be maintained throughout all tests.
9 7.2 Installation. Unless a detail is specifically required by this method of test, the humidifier shall be installed as described in the installation instructions furnished by the manufacturer.
10 7.3 Conduct of Test—Direct Room/Area Type Adiabatic Humidifiers without a Supply Water Connection. For area-type humidifiers with affixed tanks that require manual filling and do not have a connection to supply water,
7.4 Conduct of Test—Direct Room/Area Type Adiabatic Humidifiers with a Supply Water Connection. For area-type humidifiers with a direct connection to supply water, the humidifier shall be configured to operate at the maximum level of performance an…
11 7.5 Conduct of Test—Duct-Mounted Systems. The humidifier shall be configured to operate at the maximum level of performance and powered on.
7.6 Data to be Recorded. All data required to determine the humidification rate of the unit, as well as that required to demonstrate compliance with this method of test, shall be recorded. This includes the following:
7.7 Recorded Data Format and Tolerances
8. CALCULATION OF HUMIDIFICATION RATE
8.1 Calculations. The humidification rate shall be calculated using the following equation:
12 9. NORMATIVE REFERENCES
13 INFORMATIVE APPENDIX A: INFORMATIVE REFERENCES AND BIBLIOGRAPHY

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ASHRAE Standard 164.4 2021
$38.46