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ASHRAE Standard 174 2009

ASHRAE Standard 174 2009

$21.13

ASHRAE Standard 174-2009 Method of Test for Rating Desiccant-Based Dehumidification Equipment (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE-Standard-174-2009 2009 24
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ASHRAE Standard 174 provides a method of test for rating the overall performance of desiccant-based dehumidification equipment. Desiccant-based systems are typically designed with moisture removal as their primary function and deliver air at lower dew points than typical air conditioning systems. Accordingly, this method of test has been developed to assist in the measurement and documentation of variables needed to establish moisture-removal capacity per unit of energy. It is intended for equipment incorporating additional energy transfer devices that are outside the scope of ASHRAE Standard 139, Method of Test for Rating Desiccant Dehumidifiers Utilizing Heat for the Regeneration Process. Annexes to this standard are included for information purposes only and provide methods for comparing the performance of the desiccant dehumidification equipment to unitary air conditioning equipment employing electric reheat as a means for reducing the sensible heat ratio of the cooling output. Typical air conditioning equipment is rated at higher temperature and humidity ratios than are found in desiccant systems, requiring that comparative operational modes for air conditioning systems vary from their normal rating conditions. A rating standard prepared by an appropriate trade association, which specifies standard rating conditions for desiccant-based dehumidifier products, would be an ideal companion document to this ASHRAE method-of-test standard.

PDF Catalog

PDF Pages PDF Title
4 FOREWORD
1. PURPOSE
2. SCOPE
3. DEFINITIONS AND NOMENCLATURE
3.1 Definitions
3.2 Nomenclature
5 4. Classifications
6 5. Requirements
5.1 Performance of the Dehumidifier System
6. Measurements
6.1 Instruments
6.2 Temperature Measurements
6.3 Pressure Measurements
7 6.4 Electrical Measurements
6.5 Liquid Flow Measurement
6.6 Dew-Point Measurements
6.7 Time Measurements
6.8 Weight Measurements
6.9 Gas Fuel Measurements
6.10 Airflow Measurements
6.11 Water Properties Measurement
6.12 Steam Properties and Steam Condensate Flow Measurement
6.13 Tracer Gas Measurements
8 7. Apparatus
7.1 Test Room and Facilities
7.2 Test Setup
7.3 Test Equipment Installation
7.4 Measurement of Outdoor Air Percentage
9 8. Methods of Test
8.1 Test Methods
8.2 Testing Sequence
9. TEST PROCEDURES
9.1 Basic Approach. Each mode of operation defined by the manufacturer and specified in Section 4 shall be tested independently. The equipment under test and measuring apparatus shall be operated until steady-state conditions have been maintained for…
9.2 Steady-State Operation. Steady-state operation of the equipment under test shall be maintained for the pre-test period and the six consecutive ten-minute intervals of the test period to obtain a valid test. To be within steady-state operation, al…
9.3 Mode 4.5 Procedures. The procedures used for testing the equipment outdoor air percentage of Mode 4.5 operation shall be in accordance with the test procedures of ASHRAE Standard 41.2, Standard Methods for Laboratory Airflow Measurement.6
9.4 Mode 4.6 Procedures. The procedure used for testing the equipment for outdoor air percentage of Mode 4.6 operation shall be as follows. The equipment shall be set up for equipment performance testing of Mode 4.6, including the tracer gas testing …
10. DATA TO BE RECORDED
10.1 Test Data
11. CALCULATIONS
11.1 Standard Airflow Rate Values
12 11.2 Enthalpy Values
11.3 Dehumidifier System Capacities
13 11.4 Equipment Energy Use
14 11.5 Energy Balance and Test Validation
15 12. Normative References
INFORMATIVE ANNEX A— STANDARD RATING CONDITIONS
A1. Entering Air Temperature and Humidity
A2. Outdoor Air Percentage
A3. Supply Air External Resistance
16 A4. Test Set-Up Examples
A4.1 Dehumidifier Equipment Designed for Indoor Installation (Non-Weatherized)
A4.2 Dehumidifier Equipment Designed for Outdoor Installation (Weatherized)
17 A4.3 Equipment Designed for Outdoor Installation (Fuel-Fired and Weatherized)
21 A5. Equipment Performance
A5.1 Coefficient of Performance Total
A5.2 Coefficient of Performance Sensible
A5.3 Coefficient of Performance Latent
A5.4 Energy Efficiency Ratio Total
A5.5 Energy Efficiency Ratio Sensible
A5.6 Energy Efficiency Ratio Latent
22 A6. Sample Calculation of Moisture Added to Air Stream by Direct-Fired Gas Burner

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ASHRAE Standard 174 2009
$21.13