Dual port vapor injected compression: In-system testing versus test stand testing, and mapping of results. (March 2016)

• Record Type: Journal Article
• Authors: Bach, Christian K.; Groll, Eckhard A.; Braun, James E.; Horton, W. Travis
• Is Part Of: Renewable energy. Volume 87:Part 1(2016)
• Page Start: 819
• Page End: 833
• Publication Date: 2016-03
• Subjects: Vapor-injected compression -- Mapping -- Compressor -- Vapor injection -- Cold climate heat pump; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2015.08.076
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: This paper introduces the differences of in-system testing of a dual-port vapor injected compressor as compared to test stand testing and presents the performance results. Single-port vapor injected compression has been studied previously, typically using scroll compressors. Single-port vapor injection employs one port with a single intermediate injection pressure, while dual-port vapor injection uses two ports at different angular locations, leading to two intermediate pressure levels for the injected vapor. The main differences between in-system testing and test stand testing can be found in suction and injection superheat values, discharge temperature, and range of injection flow rates. Dimensionless PI-type mappings are introduced that can be used for system simulation. Highlights: Dimensionless mappings for a dual-port vapor injected compressor are introduced. The mappings include mass flowrates, as well as isentropic & volumetric efficiency. Discharge temperature is mapped to allow prediction of the operating envelope. Different data sources and their effect on the mapping approach are investigated. Differences between non-vapor injection and vapor injection are shown.