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ASHRAE Standard 35 2014 RA2024

ASHRAE Standard 35 2014 RA2024

$40.63

ASHRAE Standard 35-2014 (RA2024) — Method of Testing Desiccants for Refrigerant Drying (ANSI Approved)

Published By Publication Date Number of Pages
ASHRAE 2014 10
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ANSI/ASHRAE Standard 35 establishes a method of testing desiccants for use in refrigerant drying.

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PDF Pages PDF Title
3 Contents
4 1. Purpose
2. Scope
2.1 This standard provides a method of testing desiccants only. For testing and rating driers that use these desiccants, refer to ANSI/ASHRAE Standard 63.1, Method of Testing Liquid Line Refrigerant Driers (see Informative Appendix A—Bibliography).
2.2 The principle of this standard is to keep a desiccant of known water content in contact with the desired refrigerant until equilibrium has been established under known temperature conditions, after which the water content of the refrigerant is de…
2.3 This standard is applicable to all desiccants that do not react with the desired refrigerant.
3. Definitions
4. Classification
4.1 This method of test is concerned with testing desiccants, specifically with determining the water capacity of a desiccant and the water concentration of a refrigerant when they are in equilibrium.
4.2 Since this standard is concerned only with equilibrium conditions at a given temperature, no consideration is given to the effect of the design of the container holding the desiccant.
4.3 This method of testing desiccants uses liquid refrigerant in equilibrium with the desiccant.
4.4 The rate of drying is not considered in this standard. Measurements are made under conditions ensuring practical equilibrium.
4.5 Physical characteristics of the desiccant such as particle size, dusting properties, hardness, and the form of desiccant (i.e., molded or granular) are not considered in this standard.
5. Apparatus
5.1 A constant-temperature bath or cabinet that is able to maintain a given temperature with an accuracy of ±1°C (±2°F) and is capable of being set at any temperature within the range of desiccant use. The equilibration vessel may be placed insid…
5 5.2 An analytical balance having a sensitivity of 0.0001 g (2 × 10–7 lb).
5.3 A pan-type balance having a sensitivity of 0.01 g (2 × 10–5 lb) and a capacity of 5000 g (11 lb).
5.4 A stainless-steel equilibration vessel with minimum capacity of 300 mL (10 oz). This vessel shall have a maximum working pressure in excess of the anticipated test pressure. The vessel with its associated valve shall be adequately leak tested and…
5.5 A Karl Fischer coulometric titrator. As specified in the titrator instructions, a flowmeter and a 3A molecular sieve drier may be used. Also, a heat source (e.g., a heat gun), a temperature-monitoring device (for equilibration temperatures above …
5.6 Additional apparatus and reagents as required by the method of AHRI Standard 700-2006, Appendix C (2008 revision), Part 2.1
5.7 Crucibles with lids (platinum, fused silica, or porcelain) of sufficient volume to contain 10 g (0.022 lb) of the desiccant being tested.
5.8 A constant-temperature oven capable of maintaining the desiccant activation temperature specified by the desiccant manufacturer within ±10°C (±20°F).
6. Preparation and Analysis
6.1 Preparation of Desiccants. The desiccant shall be prepared as follows.
6.2 Analysis: Determination of Water Content of Desiccants. Water content of the prepared desiccant shall be determined as follows.
6 6.3 Preparation of Refrigerant
7. Test Procedure
7.1 Desiccant and refrigerant shall be added to the equilibration vessel by the following procedure.
7.2 The desiccant and refrigerant shall be equilibrated as follows.
7.3 The water content of equilibrated refrigerant shall be determined as follows:
7.4 Water content of equilibrated refrigerant shall be measured in triplicate. If results vary by more than 2 mg/kg (2 ppm) and by more than 10% of the mean, the test shall be repeated.
8. Proof of Equilibrium: Chemical Reaction
8.1 The equipment containing a desiccant of relatively high water content shall be, at the conclusion of test procedure in Section 7, kept for a period of two weeks at 52°C (125°F).
8.2 The test procedure in Section 7 shall then be repeated.
7 8.3 A persistent and appreciable change in EPD may indicate that a chemical reaction is occurring and thus may mean that the desiccant is not suitable for use with the tested refrigerant.
9. Data to Be Recorded
10. Normative References

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ASHRAE Standard 35 2014 RA2024
$40.63