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ASHRAE Standard 139-2022 -- Method of Testing for Rating Desiccant Dehumidifiers Utilizing Heat for the Regeneration Process (ANSI Approved), 2022
- ANSI/ASHRAE Standard 139-2022 [Go to Page]
- CONTENTS
- FOREWORD [Go to Page]
- 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
- 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.
- 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.
- 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
- 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.
- 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.
- 10. REFERENCES
- INFORMATIVE APPENDIX A: MASS BALANCE CALCULATIONS [Go to Page]
- A1. AIR MASS BALANCE
- A2. MOISTURE MASS BALANCE
- A3. MOISTURE MASS RATIO
- A4. DEVICE PRESSURE DIFFERENTIAL
- A5. MOISTURE REMOVAL RATE [Go to Page]
