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ASHRAE Standard 139 2022

ASHRAE Standard 139 2022

$38.46

ASHRAE Standard 139-2022 — Method of Testing for Rating Desiccant Dehumidifiers Utilizing Heat for the Regeneration Process (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2022 22
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ASHRAE Standard 139 provides uniform test methods for rating desiccant dehumidifiers that use heat for the regeneration process. It addresses the test methods, apparatus and instruments to be used, data to be obtained, and calculations needed to confirm valid test results. This 2022 revision of Standard 139 updates references.

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PDF Pages PDF Title
1 ANSI/ASHRAE Standard 139-2022
3 CONTENTS
4 FOREWORD
1. PURPOSE
2. SCOPE
2.1 This standard applies to desiccant-based dehumidifiers operating at atmospheric pressure. The dehumidifier shall use solid or liquid desiccants that are regenerated using heat energy.
2.2 Normally, equipment within this standard would consist of one or more desiccant contact stations through which the air to be dehumidified is moved, a means to expose the moisture-laden desiccant to a source of heat energy for regeneration, and a …
2.3 Ancillary devices are normally used to move air to be dehumidified through the device and to provide ventilation for regeneration, but they are not a part of this standard.
2.4 This standard is intended to
2.5 This standard does not apply to
3. DEFINITIONS
5 4. CLASSIFICATION OF UNITS
4.1 Desiccant dehumidifiers for the purpose of this standard are classified as to desiccant type and heating source.
4.2 Desiccant Types
4.3 Heat Sources
5. REQUIREMENTS
5.1 Testing Requirements. Desiccant dehumidifiers shall be tested for rating in accordance with the requirements set forth in this section.
5.2 Equipment. Equipment to be tested shall contain the desiccant contactor, regenerator, and regeneration heater regularly furnished with the equipment. Other accessories used shall be consistent with the test procedure.
6 5.3 Performance Determinations. Performance determinations of desiccant dehumidifiers shall consist of the
5.4 Measuring Instruments. All instruments used for measurement shall be calibrated by comparison with an instrument that has a NIST (or equivalent national laboratory) certification in the range of use, or an instrument with a NIST (or equivalent na…
6. INSTRUMENTS
6.1 Temperature Measuring Instruments. Temperature measuring instruments, unless noted below, shall be in accordance with ASHRAE Standard 41.1 1.
6.2 Pressure Measuring Instruments. All pressure measuring instruments shall be in accordance with ASHRAE Standard 41.3 2.
6.3 Dew-Point Measuring Instruments. All dew-point measurements shall be in accordance with Section 6.4 of ASHRAE Standard 41.6 3.
11 6.4 Electrical Instruments
6.5 Liquid Flow Measurement
6.6 Speed Measuring Instruments. Speed measurements shall be made with a revolution counter, tachometer, stroboscope, or oscilloscope having an accuracy of ±1.0% of reading.
6.7 Time Measurements. Time measurements shall be made with instruments having an accuracy of ±0.20% of reading.
6.8 Weight Measurements. Weight measurement shall be made with an apparatus having an accuracy of ±0.20% of reading.
6.9 Gas Fuel Measurements
6.10 Airflow Measurements. All airflow measurements shall be made in accordance with ASHRAE Standard 41.2 4.
6.11 Water Properties Measuring Apparatus
12 6.12 Steam Properties and Condensate Flow Measurement
6.13 Static Pressure Measurements in Air. All static pressure measurements shall be made in accordance with ASHRAE Standard 41.2 4.
6.14 Measurement of Liquid Desiccant Concentration
7. TEST PREPARATION—EQUIPMENT INSTALLATION
7.1 The equipment to be tested shall be installed in the test section in accordance with the manufacturer’s standard installation instructions using the recommended procedures and accessories.
7.2 No alterations to the equipment shall be made except for the attachment of required test apparatus and instruments in the prescribed manner.
7.3 No change shall be made in fan speed or system resistance to correct for barometric variations due to weather.
8. METHOD OF TEST
8.1 Test Operating Procedure
8.2 Airflow Measuring Procedure. Airflow rates shall be determined at each of the four measurement stations as shown in Figures 4 through 7.
14 9. DATA AND CALCULATIONS
9.1 The data shall be recorded as indicated in Table 1 for dry desiccant systems or Table 2 for liquid desiccant systems for each performance condition at which the equipment is to be tested. Only those data points necessary to carry out the calculat…
9.2 The following calculations shall be performed and included with the test report. Mass flow rate used in the equations shall be those at duct sections one and two.
18 10. REFERENCES
19 INFORMATIVE APPENDIX A: MASS BALANCE CALCULATIONS
A1. AIR MASS BALANCE
A2. MOISTURE MASS BALANCE
A3. MOISTURE MASS RATIO
A4. DEVICE PRESSURE DIFFERENTIAL
A5. MOISTURE REMOVAL RATE

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ASHRAE Standard 139 2022
$38.46