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ASHRAE Standard 181 2018

ASHRAE Standard 181 2018

$38.46

ASHRAE Standard 181-2018 – Methods of Testing for Rating Liquid-to-Liquid Heat Exchangers (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2018 16
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ASHRAE Standard 181 prescribes methods of testing the thermal performanceand pressure drop of liquid-to-liquid heat exchangers.

PDF Catalog

PDF Pages PDF Title
1 ANSI/ASHRAE Standard 181-2018
3 CONTENTS
4 FOREWORD
1. PURPOSE
2. SCOPE
3. DEFINITION OF TERMS
4. REQUIRED TEST RESULTS
4.1 In expressing test results, the following parameters shall be stated:
4.2 For all parameters listed in Section 4.1, uncertainty shall be calculated as described in Section 7.4.
5. TEST METHODS
5.1 Standard Test Methods
5 5.2 Calculation of Thermal Capacity (see Figure 5-1)
FIGURE 5-1 Depiction of relevant test parameters.
6. INSTRUMENTS AND TEST APPARATUS
6.1 General
6.2 Temperature-Measuring Instruments
6.3 Pressure-Measuring Instruments
6.4 Liquid Flow-Measuring Instruments
6.5 Time Measurements. Time measurements shall be made with an apparatus whose accuracy shall be that required to meet the uncertainty specified in Section 5.1.2.
6.6 Weight Measurements. Weight measurements shall be made with an apparatus whose accuracy shall be that required to meet the uncertainty specified in Section 5.1.2.
7. TEST PROCEDURE
7.1 Apparatus Assembly
7.2 Operation and Limits
6 7.3 Computation of Results
7.4 Uncertainty Analysis
8. REFERENCES
7 INFORMATIVE APPENDIX A—UNCERTAINTY ANALAYSIS
A1. Definitions
A2. Methodology for Uncertainty Analysis
8 A3. Development of Uncertainty Calculations for Liquid-to-Liquid Heat Exchangers
9 A4. References
10 INFORMATIVE APPENDIX B—METHOD TO COMPUTE THE ENTHALPY DIFFERENCE OF A LIQUID STREAM WHEN AN EOS-BASED FUNCTION IS NOT AVAILABLE
B1. Overview
B2. Derivation of an Estimate for Enthalpy Difference
B3. Example
11 B4. Recommendations
B5. References
FIGURE B-1 Volume expansivity of water as reported by REFPROP.
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).
12 FIGURE B-3 Density of a 30%vol propylene glycol/water solution per Table 10 in Chapter 31 of the 2009 ASHRAE Handbook—Fundamentals (I-P).
TABLE B-1 Example Values for a Condenser Cooled by a Propylene Glycol Solution (Values in Bold Represent the Measurements)
13 FIGURE B-4 Specific heat of a 30%vol propylene glycol/water solution per Table 11 in Chapter 31 of the 2009 ASHRAE Handbook—Fundamentals (I-P).

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ASHRAE Standard 181 2018
$38.46