Updated Standards, July 2019

ANSI/ASHRAE Standard 23.1-2019, Methods for Performance Testing Positive Displacement Refrigerant Compressors and Condensing Units that Operate at Subcritical Pressures of the Refrigerant

The 2019 edition of Standard 23.1 expands the scope to cover multistage compressors in addition to single-stage compressors and intermediate cooling or refrigerant injection in addition to liquid injection. Descriptions, equations and figures have also been revised to clarify steps required to apply this standard.

ANSI/ASHRAE Standard 37-2009 (RA 2019), Methods of Testing for Rating Electrically Driven Unitary Air-Conditioning and Heat-Pump Equipment

Standard 37 provides test methods for determining the cooling capacity of unitary air-conditioning equipment and the cooling or heating capacities, or both, of unitary heat-pump equipment.

The 2019 reaffirmation includes no substantive changes.

ANSI/ASHRAE Standard 212-2019, Method of Test for Determining Energy Performance and Water-Use Efficiency of Add-On Evaporative Precoolers for Unitary Air-Conditioning Equipment

Standard 212 provides test methods for gathering performance data for use in calculating the energy savings potential and water-use performance of add-on evaporative precoolers for condenser inlet air of air-cooled, direct-expansion unitary air-conditioning equipment.