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ASHRAE Standard 198 2013

ASHRAE Standard 198 2013

$38.46

ANSI/ASHRAE Standard 198-2013 Method of Test for Rating DX-Dedicated Outdoor Air Systems for Moisture Removal Capacity and Moisture Removal Efficiency

Published By Publication Date Number of Pages
ASHRAE 2013 18
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Standard 198-2013 prescribes a test method for rating direct-exchange dedicated outdoor air systems (DX-DOAS) units. Method of test applies to air-cooled,water-cooled, or water-source factory-assembled DX-DOAS products that condition 100% outdoor air and may include factory assembled preconditioning device(s).

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PDF Pages PDF Title
1 ANSI/ASHRAE Standard 198-2013
4 FOREWORD
1. Purpose
2. Scope
3. Definitions
5 4. Instrumentation
4.1 Airflow Measurement. Instrumentation and calculations to determine airflow shall be in accordance with one or more of the methods described in ASHRAE Standard 41.2, Standard Methods for Laboratory Air-Flow Measurement2.
4.2 Pressure Measurement. Instrumentation and calculations to determine pressure measurements shall be in accordance with ASHRAE Standard 41.3, Standard Method for Pressure Measurement3.
4.3 Air Enthalpy. Instrumentation and calculations to determine moist air properties shall be made in accordance with ANSI/ASHRAE Standard 41.6 Standard Method for Measurement of Moist Air Properties4.
4.4 Temperature Measuring Instruments. Instrumentation for all temperatures shall be in accordance with ANSI/ ASHRAE Standard 41.1, Standard Method for Temperature Measurement5.
4.5 Electrical Instruments. Electrical measurements shall be made with indicating or integrating instruments.
6 4.6 Liquid Flow Measurement. Water flow rates shall be measured with a liquid flowmeter or quantity meter having an accuracy of ±1.0% of the indicated value in accordance with ASHRAE Standard 41.8, Standard Methods of Measurement of Flow of Liquids …
4.7 Time and Mass Measurements. Time interval measurements shall be made with an instrument having an accuracy of ±0.2% of the indicated value.
5. Recommended Practices
5.1 Temperature Measurements. All air temperature measurements should be taken upstream of static pressure taps on the inlet and downstream of the static pressure taps on the outlet.
6. Apparatus and Setup
6.1 Test Room Requirements. Test rooms shall be provided with suitable means to maintain prescribed conditions of temperature, humidity, and static pressure of the air entering the test section.
Figure 1 Typical setup for DX-DOAS unit without energy recovery.
7 Figure 2 Typical setup for DX-DOAS units with energy recovery.
6.2 Airflow Rate Measuring Apparatus
6.3 Plenum Static Pressure Measurements. Where static pressure is to be measured during testing, all measurement apparatuses and procedures shall be made in accordance with ASHRAE Standard 41.22.
6.4 Supplemental Heat Measuring Apparatus. Means shall be provided to measure the amount of water, steam, gas, or other energy source used to supply supplementary heat to a dehumidifier under test. If a separate electrical connection for supplementar…
6.5 Sensors. In-duct measurements shall be taken at not less than three locations at the centers of equal segments of the cross-sectional area, or suitable sampling or mixing devices giving equivalent results shall be provided. Mixing and sampling de…
6.6 Unit Preparation. Unit should be prepared such that any optional damper not used for the purpose of introducing outdoor air or not used when operating in a 100% outdoor air conditioning mode is sealed to prevent any leakage. This includes optiona…
8 7. Testing
7.1 Preparation of the Test Room(s)
TABLE 1 Test Tolerances
7.2 Equipment Installation
9 8. Operating Procedures
8.1 Airflow and External Static Pressures. Where airflow rate of equipment is adjustable, equipment should be set to operate per the equipment manufacturer’s instructions. If the unit has provisions that may vary the flow rate based on pressurizati…
8.2 Equilibrium. The test unit and room conditioning apparatus shall be operated in accordance with manufacturer’s instructions until equilibrium conditions are reached but for not less than one hour. Data shall be recorded at five- minute interval…
8.3 Modes of Operation. Unit shall be tested at rating conditions, dehumidification, by allowing the unit controls to operate at the entering air condition to be tested.
8.4 Test Duration and Measurement Frequency. The duration of the test for each rating condition shall be one hour immediately subsequent to achieving equilibrium. Measurements shall be recorded every five minutes.
8.5 Data to be Recorded
8.6 Test Tolerances
9. Reported Values
9.1 All Tested Conditions. For each condition tested, the following values shall be reported:
9.2 Dehumidification Conditions. For each dehumidification condition tested, the following values shall be reported.
10 TABLE 2 Data to Be Recorded for Units without Exhaust Air Energy Recovery
9.3 Heating Conditions. For each heating condition tested, the following values shall be reported.
10. Calculations of Results
10.1 Data to be used for Calculations. All data used for calculations shall be the arithmetic mean of the measurements taken for each point after equilibrium.
10.2 Airflow calculations shall be performed as indicated in ANSI/ASHRAE Standard 41.22 for the method used.
10.3 Unit total reheat capacity at each dehumidification condition—reheat on, shall be calculated based on test data collected using the following equation:
11 TABLE 3 Data to Be Recorded for Units with Exhaust Air Energy Recovery
10.4 Total Gross Cooling Capacity at each Dehumidification Condition—Reheat Off, shall be calculated based on test data collected using the following equation.
12 10.5 MRC based on test data collected according to the air enthalpy method shall be calculated for each standard rating condition, dehumidification, using the following equation:
10.6 MRE shall be calculated by taking the MRC divided by the total input power during the mode of operation tested.
10.7 Unit total heating capacity at all rating conditions, heating, shall be calculated based on test data collected using the following equation:
10.8 Supply air dew-point temperature at each standard rating condition, dehumidification, shall be calculated based on supply air dry-bulb and supply air wet-bulb data collected and using equations indicated in the latest edition of the ASHRAE Handb…
10.9 COP (for water-source heat pumps) at all standard rating conditions, heating, shall be calculated based on test data collected using the following equation:
10.10 The unit total heating capacity, unit total reheat capacity, total gross cooling capacity, and COP shall be adjusted for duct losses. The duct loss adjustment shall be added to the capacities. The duct loss adjustment shall be calculated as fol…
11. Nomenclature
11.1 Symbols used in this standard are as follows:
12. Reference Properties and Data
12.1 Thermodynamic Properties of Air
12.2 Thermodynamic Properties of Water and Steam
13 13. References
14 Informative Appendix A—Typical Rating Conditions for Air-Cooled and Water-Cooled DX-DOAS Units
TABLE A-1 Rating Conditions for Air-Cooled and Water-Cooled DX-DOAS Units
15 Informative Appendix B—Typical Rating Conditions for Water Source Heat Pump DX-DOAS Units
TABLE B-1 Rating Conditions for Water Source Heat Pump DX-DOAS Units

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ASHRAE Standard 198 2013
$38.46