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Contenuto archiviato il 2019-03-15

DEVELOPMENT OF A CHEAP AND EFFICIENTLY ADJUSTABLE SOLVENT PUMP FOR ABSORPTION HEAT PUMPS

Obiettivo



DEVELOPMENT OF A SOLUTION PUMP WHICH IS CHEAP AND EFFICIENT IS ANOTHER IMPORTANT AIM IN ABSORPTION HEAT PUMP RESEARCH. ABOUT FOUR YEARS AGO STIEBEL ELTRON, GERMANY STARTED R + D ON THE DEVELOPMENT OF A 15 KW ABSORPTION HEAT PUMP WHICH USES A FLUID PAIR E181/R22. ONE OF THE MAJOR PROBLEMS WAS TO FIND A SUITABLE AND CHEAP (LESS THAN 500 DM) SOLUTION PUMP. AFTER SYSTEMATIC TESTINGOF DIFFERENT PUMP TYPES THE ANNULAR GEAR PUMP WAS FOUND TO BE MOST SUITABLE. TWO WAYS WERE FOLLOWED TO COME TO AN EFFICIENT PUMPING SYSTEM : IN THE INTERMEDIATE SOLUTION THE PUMP INSIDE THE FLUID RESERVOIR IS DRIVEN BY AN ELECTRIC MOTOR OUTSIDE. SATISFACTORY SHAFT SEALING METHODS HAVE BEEN FOUND WHICH ALLOWED PROBLEM FREE HEAT PUMP OPERATION DURING 6 000 HRS WITH THE DURATION TEST TO CONTINUE. IN THE SECOND SOLUTION THE ELECTRIC MOTOR IS COMPLETELY SUBMERGED IN THE WORKING FLUID TOGETHER WITH THE PUMP (HERMETIC MODEL). AFTER SOME TIME THE CONDUCTIVITY IN THE LIQUID INCREASED BY A FACTOR 100 - 1000, POSSIBLY DUE TO THE FORMATION OF IONS, TO VALUES WHERE HERMETIC OPERATION IS NOT POSSIBLE. AFTER THAT AN ELECTRIC MOTOR WAS STUDIED WITH A CASING BETWEEN THE ROTOR AND THE STATOR (WITH ELECTRIC WIRES) IN SUCH A WAY THAT THE ROTOR IS IN THE WORKING FLUID AND THE STATOR NOT. THIS FINAL SOLUTION WAS ALSO VERY SATISFACTORY. IT IS BELIEVED THAT FOR MASS PRODUCTION THESE SOLUTION PUMPS CAN BE PRODUCED FOR LESS THAN 500 DM. WITH SMALL MODIFICATIONS THEY WILL ALSO BE SUITABLE FOR OTHER FLUID MISTURES SUCH AS NH3/H2O.

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Coordinatore

STIEBEL ELTRON GMBH & CO
Contributo UE
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Indirizzo
DR STIEBEL STRAßE
3450 HOLZMINDEN
Germania

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