University of Maryland DRUM  
University of Maryland Digital Repository at the University of Maryland

Digital Repository at the University of Maryland (DRUM) >
Theses and Dissertations from UMD >
UMD Theses and Dissertations >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1903/1857

Title: Peformance of Two-Stage CO2 Refrigeration Cycles
Authors: Celik, Aydin
Advisors: Radermacher, Reinhard
Department/Program: Mechanical Engineering
Type: Thesis
Sponsors: Digital Repository at the University of Maryland
University of Maryland (College Park, Md.)
Subjects: Engineering, Mechanical
Issue Date: 25-Aug-2004
Abstract: The performance of four CO2 cycle options was measured for three different evaporating temperatures, 7.2, -6.7, and -23.3°C under the ARI Standard 520 for condensing units. The four cycle options were the baseline cycle, the cycle with suction line heat exchanger, the cycle with intercooler, and two-stage split cycle. The cycle operation at the low evaporating temperature was limited by the high discharge temperature for most cycle options except the two-stage split cycle. The compressor used in the testing was a hermetic, rotary type two-stage compressor. The effect of cycles and individual cycle components on system capacity and performance was investigated. Cycle optimization was conducted by using mass flow rate ratio, intermediate pressure coefficient and power ratio. Modeling of these four cycles by EES showed similar results with the test data and provided information on sizing the system components for different system capacities for maximum performance.
URI: http://hdl.handle.net/1903/1857
Appears in Collections:Mechanical Engineering Theses and Dissertations
UMD Theses and Dissertations

Files in This Item:

File Description SizeFormatNo. of Downloads
umi-umd-1855.pdf1.23 MBAdobe PDF3253View/Open

All items in DRUM are protected by copyright, with all rights reserved.

 

DRUM is brought to you by the University of Maryland Libraries
University of Maryland, College Park, MD 20742-7011 (301)314-1328.
Please send us your comments