Cel THE WORK CONDUCTED BY THE CRANFIELD INSTITUTE OF TECHNOLOGY IS DIRECTED AT DEVELOPING LOW-COST, ROBUST, QUIET AND EFFICIENT MULTI-VANE EXPANDERS (MVE) WITH A 3 - 6 KW NOMINAL SHAFT POWER AS A PRIME MOVER IN AN ORC ENGINE. COMPARED TO TURBINES, MVE HAVE THE FOLLOWING ADVANTAGES : FLAT OPERATING EFFICIENCY CHARACTERISTICS OVER A WIDE RANGE OF OPERATING CONDITIONS (E.G. STEAM INLET PRESSURE OF 10 - 40 BAR); LOW SPEEDS (ABOUT 3 000 RPM); AND THEY CAN EXPAND INTO THE WET REGION OF A WORKING FLUID WITHOUT ADVERSE EFFECTS. IN ADDITION THEY HAVE : EASY CONTROLLABILITY; QUITE AND VIBRATION FREE OPERATION; HIGH POWER-TO-WEIGHT RATIO; LOW MAINTENANCE REQUIREMENTS; FEW, EASILY REPLACABLE, MOVING PARTS AND LOW LUBRICATION REQUIREMENTS; THEIR ROTATIONAL SPEED IS DIRECTLY COMPATIBLE WITH A WIDE RANGE OF DRIVEN DEVICES SUCH AS GENERATORS, COMPRESSORS, FANS, PUMPS AND OTHERS. TWO TYPES OF MVE HAVE BEEN INVESTIGATED USING BOTH THEORETICAL AND PRACTICAL APPROACHES. A CONVENTIONAL MVE HAS BEEN TESTED USING R11, STEAM AND R113 AS THE WORKING FLUID AND A LOBE MVE HAS BEEN TESTED USING COMPRESSED AIR. EXPANDER EFFICIENCIES OF 65 % (CONVENTIONAL) AND 48 % (LOBE) HAVE BEEN MEASURED. FROM COMPUTER SIMULATIONS, REALISTIC TARGET EFFICIENCIES OF BETWEEN 70 - 80 % OR BETTER SHOULD BE ATTAINABLE. IT WAS CONCLUDED THAT THE MVE PERFORMANCE IS PRIMARILY AFFECTED BY ITS DESIGN WITH RESPECT TO MECHANICAL FRICTION AND LEAKAGE. FURTHERMORE, AN ORC MAY BE OPTIMISED FOR MAXIMUM EFFICIENCY ONCE THE WORKING FLUID AND EXPANDER CHARACTERISTICS ARE KNOWN; IF EFFECTIVE POSITIVE INTERNAL SEALING IS EMPLOYED, HIGH EFFICIENCIES CAN BE OBTAINED. Program(-y) PRE-ENNONUC 2C - Energy research and development programme (EEC), 1979-1983 Temat(-y) Data not available Zaproszenie do składania wniosków Data not available System finansowania Data not available Koordynator CRANFIELD UNIVERSITY Wkład UE Brak danych Adres MK43 0AL BEDFORD Zjednoczone Królestwo Zobacz na mapie Koszt całkowity Brak danych
