000202111 001__ 202111
000202111 005__ 20181203023626.0
000202111 0247_ $$2doi$$a10.1115/1.4028391
000202111 022__ $$a0742-4795
000202111 02470 $$2ISI$$a000350144900026
000202111 037__ $$aARTICLE
000202111 245__ $$aModeling and Experimental Investigation of an Oil-Free Microcompressor-Turbine Unit for an Organic Rankine Cycle Driven Heat Pump
000202111 260__ $$bAmerican Society of Mechanical Engineers$$c2015$$aNew York
000202111 269__ $$a2015
000202111 300__ $$a10
000202111 336__ $$aJournal Articles
000202111 520__ $$aDomestic heating and cooling will more and more have to rely on heat pumps (HPs) in order to support a more rational use of primary energy consumption. The HP market is mainly dominated by electrically driven vapor compression cycles and by thermally driven sorption processes. The drawback of electrically driven vapor compression cycle is their dependence on an electrical grid and the fact that they increase the winter or summer electricity peak demands. Hence, a thermally driven vapor compression cycle would offer substantial advantages and flexibility to the end user for heating and cooling applications. This paper presents the investigation of an oil-free compressor-turbine unit (CTU) used for a thermally driven HP (TDHP) based on the combination of a HP compression cycle and an organic Rankine cycle (ORC). The CTU consists of a radial inflow turbine and a centrifugal compressor of the order of 2 kW each, directly coupled through a shaft supported on gas lubricated bearings. The CTU has been tested at rotor speeds in excess of 200 krpm, reaching compressor and turbine pressure ratios up to 2.8 and 4.4, respectively, and isentropic efficiencies around 70%. Comparisons between the experimental data and predictions of models, that are briefly described here, have been carried out. A sensitivity analysis based on the experimentally validated models shows that tip clearance, for both compressor and turbine, and surface roughness of the compressor are key parameters for further improving performance.
000202111 700__ $$aDemierre, Jonathan
000202111 700__ $$0247327$$g230861$$aRubino, Antonio
000202111 700__ $$aSchiffmann, Jürg Alexander
000202111 773__ $$j137$$tTransactions- ASME Journal of Engineering for Gas Turbines and Power$$k3$$q032602
000202111 909C0 $$xU12652$$0252488$$pLAMD
000202111 909CO $$pSTI$$particle$$ooai:infoscience.tind.io:202111
000202111 917Z8 $$x103606
000202111 937__ $$aEPFL-ARTICLE-202111
000202111 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000202111 980__ $$aARTICLE