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ASHRAE Standard 24 2019

ASHRAE Standard 24 2019

$38.46

ASHRAE Standard 24-2019 — Methods of Testing for Rating Evaporators Used for Cooling Liquids (ASHRAE/ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2019 14
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Standard 24 prescribes methods of testing the thermal performance and liquid-side pressure drop of evaporators that operate at subcritical pressures of the evaporating refrigerant.The 2019 revision to the standard includes the following updates: Updated references- Added requirement for uncertainty analysis- Added requirement to use liquid enthalpy for calculating total refrigerant capacity.The standard also includes access to an Excel workbook to assist with uncertainty calculations.

PDF Catalog

PDF Pages PDF Title
3 CONTENTS
4 FOREWORD
1. PURPOSE
2. SCOPE
3. DEFINITIONS
4. REQUIRED TEST RESULTS
4.1 Test results shall be expressed in the following terms:
4.2 For all measured or calculated parameters listed in Section 5.1, uncertainty shall be calculated as described in Section 7.4.
5. TEST METHODS
5.1 Standard Test Methods
5 5.2 Primary Test Method
5.3 Confirming Test Method. The confirming test shall consist of a secondary measurement of the net refrigeration capacity produced in the evaporator, using the product of the refrigerant mass flow rate and the enthalpy difference between entering an…
6. INSTRUMENTS, TEST APPARATUS, AND PHYSICAL PROPERTIES
6.1 General
6.2 Temperature Measurement
6.3 Pressure Measurement
6.4 Refrigerant Flow Measurement. Refrigerant flow measurements shall be made using either direct flow or indirect flow methods.
6 6.5 Liquid Flow Rate Measurement
6.6 Time Measurements. Time measurements shall be made with an apparatus whose minimum accuracy is within ±0.1% of the elapsed time.
6.7 Weight Measurements. Weight measurements shall be made with an apparatus whose minimum accuracy is within ±0.5% of the quantity measured.
7. TEST PROCEDURE
7.1 General
7.2 Operation and Limits
7.3 Computation of Results
7.4 Uncertainty Analysis
8. REFERENCES
8 INFORMATIVE APPENDIX A: UNCERTAINTY ANALYSIS
A1. Definitions
A2. Methodology for Uncertainty Analysis
9 A3. Development of Uncertainty Calculations for Evaporator Testing
10 INFORMATIVE APPENDIX B: METHOD TO COMPUTE THE ENTHALPY DIFFERENCE OF A LIQUID STREAM WHEN AN EOS-BASED FUNCTION IS NOT AVAILABLE B-1
B1. Overview
B2. Derivation of an Estimate for Enthalpy Difference
B3. Example
11 B4. Recommendations
B5. References
Table B-1 Example Values for a Condenser Cooled by a Propylene Glycol Solution
Figure B-1 Volume expansivity of water as reported by REFPROP.
12 Figure B-2 Relative error in heat transfer rate associated with ignoring the pressure drop of the liquid stream for water at 89.6°F (32°C).
Figure B-3 Density of a 30%vol propylene glycol/water solution per 2009 ASHRAE Handbook—Fundamentals (I-P), Chapter 31, Table 10.
Figure B-4 Specific heat of a 30%vol propylene glycol/water solution per 2009 ASHRAE Handbook—Fundamentals (I-P), Chapter 31, Table 11.

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ASHRAE Standard 24 2019
$38.46