Experimental investigation of a direct driven radial compressor for domestic heat pumps |
| |
Authors: | J. Schiffmann D. Favrat |
| |
Affiliation: | aFischer Engineering Solutions AG, Birkenweg 3, CH-3360 Herzogenbuchsee, Switzerland;bEcole Polytechnique Fédérale de Lausanne, EPFL STI IGM LENI, Station 9, CH-1015 Lausanne, Switzerland |
| |
Abstract: | The presence of oil in domestic heat pumps is an obstacle toward higher efficiency, particularly for enhanced surface evaporators and for advanced concepts based on two-stage cycles. Very compact direct driven radial compressors supported on oil-free bearings represent a promising alternative. This paper presents the derivation of the specifications, the choice for an appropriate refrigerant fluid and the design of a proof of concept prototype with the various tradeoffs between the impeller characteristics to follow the seasonal heat demand, the bearing and rotordynamics for a stable operation. Heat pump simulation results, the design of the impeller as well as the layout of the experimental facility and first experimental results are presented. An impeller with a tip diameter of 20 mm has been tested at rotational speeds of up to 210 krpm reaching pressure ratios in excess of 3.3 and efficiencies above 78%. The refrigerant chosen for this first experimental approach is HFC 134a. |
| |
Keywords: | Heat pump Domestic application Centrifugal compressor R134a Design Compressor Simulation PerformanceMots clé s: Pompe à chaleur Application domestique Compresseur centrifuge R134a Conception Compresseur Simulation Performance |
本文献已被 ScienceDirect 等数据库收录! |
|