Features of refrigeration screw compressor operation at ambient temperature decrease

• Published in: Omskij naučnyj vestnik. Seriâ "Aviacionno-raketnoe i ènergetičeskoe mašinostroenie" (Online) Vol. 4; no. 3; pp. 9 - 14
• Main Authors: Noskov, A. N., Shaposhnikova, M.
• Format: Journal Article
• Language: English
• Published: Omsk State Technical University, Federal State Budgetary Educational Institution of Higher Education 01.10.2020
• Subjects: co-regulation of cooling capacity and geometric compression ratio; condensation temperature decrease; liquid pump before throttling devices; oil-flooded screw compressor
• ISSN: 2588-0373; 2587-764X
• DOI: 10.25206/2588-0373-2020-4-3-9-14

With a decrease in ambient temperature, the heat gain on the refrigeration machine and condensation pressure decrease, which requires a decrease in cooling capacity and geometric compression ratio of the screw compressor. A condensation pressure decrease below a certain value disrupts the stable operation of throttling devices. The article describes the operation scheme of the refrigeration machine with a screw compressor and a liquid pump before the throttling devices, which allows it to work at a decreased condensation pressure. The dependences of changes in net efficiency, cooling capacity, power consumption and cooling coefficient at full and partial capacity with co-regulation of cooling capacity and geometric compression ratio are given. The experimental and calculated characteristics of a screw compressor operating with R22 freon are used