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4	FOREWORD FOREWORD 1. PURPOSE 1. PURPOSE 2. SCOPE 2. SCOPE 2.1 This standard applies to desiccant-based dehumidifiers operating at atmospheric pressure. The dehumidifier may utilize solid or liquid desiccants that are regenerated utilizing heat energy. 2.1 This standard applies to desiccant-based dehumidifiers operating at atmospheric pressure. The dehumidifier may utilize solid or liquid desiccants that are regenerated utilizing heat energy. 2.2 Normally, equipment within this standard would consist of one or more desiccant contact stations through which the air to be… 2.2 Normally, equipment within this standard would consist of one or more desiccant contact stations through which the air to be… 2.3 Ancillary devices are normally utilized to move air to be dehumidified through the device and to provide ventilation for regeneration, but they are not a part of this standard. 2.3 Ancillary devices are normally utilized 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 2.4 This standard is intended to 2.5 This standard does not apply to: 2.5 This standard does not apply to: 3. DEFINITIONS 3. DEFINITIONS
5	4. CLASSIFICATION OF UNITS 4. CLASSIFICATION OF UNITS 4.1 Desiccant dehumidifiers for the purpose of this standard are classified as to desiccant type and heating source. 4.1 Desiccant dehumidifiers for the purpose of this standard are classified as to desiccant type and heating source. 4.2 Desiccant types: 4.2 Desiccant types: 4.3 Heat sources: 4.3 Heat sources: 5. REQUIREMENTS 5. REQUIREMENTS 5.1 Testing Requirements. Desiccant dehumidifiers shall be tested for rating in accordance with the requirements set forth in this section. 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 may or may not be utilized, consistent with the test procedure. 5.2 Equipment. Equipment to be tested shall contain the desiccant contactor, regenerator, and regeneration heater regularly furnished with the equipment. Other accessories may or may not be utilized, consistent with the test procedure. 5.3 Performance Determinations. Performance determinations of desiccant dehumidifiers shall consist of the following: 5.3 Performance Determinations. Performance determinations of desiccant dehumidifiers shall consist of the following: 5.4 Measurement Instruments. All instruments used for measurement shall be calibrated by comparison with an instrument that has … 5.4 Measurement Instruments. All instruments used for measurement shall be calibrated by comparison with an instrument that has … 6. INSTRUMENTS 6. INSTRUMENTS 6.1 Temperature Measuring Instruments. Temperature measurement instruments, unless noted below, shall be in accordance with ASHRAE Standard 41.1.1 6.1 Temperature Measuring Instruments. Temperature measurement instruments, unless noted below, shall be in accordance with ASHRAE Standard 41.1.1
10	6.2 Pressure Measuring Instruments. All pressure- measuring instruments shall be in accordance with ASHRAE Standard 41.3.2 6.2 Pressure Measuring Instruments. All pressure- measuring instruments shall be in accordance with ASHRAE Standard 41.3.2 6.3 Dew Point Measurement Instruments. All dew point measurements shall be in accordance with Sections 6.3 and 6.4 of ASHRAE Standard 41.6.3 6.3 Dew Point Measurement Instruments. All dew point measurements shall be in accordance with Sections 6.3 and 6.4 of ASHRAE Standard 41.6.3 6.4 Electrical Instruments 6.4 Electrical Instruments 6.5 Liquid Flow Measurement 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. 6.6 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. 6.7 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 apparatus having an accuracy of ±0.20% of reading. 6.8 Weight Measurements. Weight measurement shall be made with apparatus having an accuracy of ±0.20% of reading. 6.9 Gas Fuel Measurements 6.9 Gas Fuel Measurements 6.10 Airflow Measurements. All airflow measurements shall be made in accordance with ASHRAE Standard 41.2.4 6.10 Airflow Measurements. All airflow measurements shall be made in accordance with ASHRAE Standard 41.2.4
11	6.11 Water Properties Measuring Apparatus 6.11 Water Properties Measuring Apparatus
12	6.12 Steam Properties and Condensate Flow Measurement 6.12 Steam Properties and Condensate Flow Measurement
13	6.13 Static Pressure Measurements in Air. All static pressure measurements shall be made in accordance with ASHRAE Standard 41.2.4 6.13 Static Pressure Measurements in Air. All static pressure measurements shall be made in accordance with ASHRAE Standard 41.2.4
14	6.14 Measurement of Liquid Desiccant Concentration 6.14 Measurement of Liquid Desiccant Concentration 7. TEST PREPARATION-EQUIPMENT INSTALLATION 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. 7.1 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. 7.2 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. 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. METHOD OF TEST 8.1 Test Operating Procedure 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 Figure 7. 8.2 Airflow Measuring Procedure. Airflow rates shall be determined at each of the four measurement stations as shown in Figure 7.
16	9. DATA AND CALCULATIONS 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 eac… 9.1 The data shall be recorded as indicated in Table 1 for dry desiccant systems or Table 2 for liquid desiccant systems for eac… 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. 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.
17	10. REFERENCES 10. REFERENCES
18	Informative Appendix A Mass Balance Calculations Informative Appendix A Mass Balance Calculations A1. Air Mass Balance A1. Air Mass Balance A2. Moisture Mass Balance A2. Moisture Mass Balance A3. Moisture Mass Ratio A3. Moisture Mass Ratio A4. Device Pressure Differential A4. Device Pressure Differential A5. Moisture Removal Rate A5. Moisture Removal Rate

Published By	Publication Date	Number of Pages
ASHRAE	2007	21


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Standard Title	ASHRAE Standard 139-2007 Method of Testing for Rating Desiccant Dehumidifiers Utilizing Heat for the Regeneration Process (ANSI Approved)
Published Code	ASHRAE
Publication Date	2007
Pages Count	21

ASHRAE 139 07:2007 Edition

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