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2. ANSI/AHRI Standard 540-99, 2010, Positive Displacement Refrigerant Compressors and Compressor Units, Air Conditioning and Refrigeration Institute, Arlington, VA.
3. Effectiveness models for cooling towers and cooling coils;Braun;ASHRAE Trans.,1989
4. British Standard, EN 378-1:2016, Refrigerating systems and heat pumps. Safety and environmental requirements. Basic requirements, definitions, classification and selection criteria (British Standard).
5. Environment Protection Agency (EPA), Charge limits of hydrocarbon refrigerants in small ACunits; http://hydrocarbons21.com/articles/5417/us_epa_proposes_approval_of_4_hcs_in_6_ac_r_applications, EPA, 2014.