Objective ALL WORKING FLUID PAIRS WHICH ARE PRESENTLY USED IN DOMESTIC ABSORPTION HEAT PUMPS HAVE CERTAIN DISADVANTAGES. A SYSTEMATIC SEARCH FOR SUITABLE WORKING FLUID PAIRS HAS THEREFORE BEEN CARRIED OUT BY THE UNIVERSITY OF ESSEN, GERMANY. ALCOHOLS AND AMINES AS SOLUTIONS AND DIFFERENT HALIDES, NITRATES AND THYOCYANATES AS SOLVENTS HAVE BEEN STUDIED. UP TILL NOW BINARY COMBINATIONS OF THE WORKING FLUIDS TFE, R123A, R30, R22 AND A LARGE NUMBER OF SOLVENTS HAVE BEEN SYSTEMATICALLY STUDIED BOTH THEORETICALLY AND EXPERIMENTALLY. ALL FOUR WORKING FLUIDS HAD A REMARKABLE SOLUBILITY IN HMPT BUT THE THERMAL INSTABILITY OF HMPT EXCLUDES THE APPLICATION IN ABSORPTION HEAT PUMPS. HOWEVER A LARGE NUMBER OF OTHER PROMISING COMBINATIONS HAVE BEEN IDENTIFIED. ALSO TERNARY COMBINATIONS HAVE BEEN INVESTIGATED. METHYLAMINE WITH AQUEOUS-SALT SOLUTIONS AS A SOLVENT WERE NOT THERMALLY STABLE UP TO 200 DEGREES C. NH3 WITH AQUEOUS-SALT SALT SOLUTIONS TURNED OUT TO BE PROMISING. FIVE OF THE MOST PROMISING SYSTEMS (TFE-NMP, R123A-DTG, METHYAMINE-GLY, R22-DTRG AND NH3-LINO3/H2O) WERE INVESTIGATED IN MORE DETAIL. THESE INVESTIGATIONS COMPREHENDED A COMPLETE MEASUREMENT OF THE PROPERTIES : VAPOUR PRESSURE, DENSITY AND VISCOSITY WITHIN THE TEMPERATURE RANGE OF INTEREST. ALSO CALORIFIC PROPERTIES AND VAPOUR-LIQUID EQUILIBRIA OF SOME SYSTEMS WERE DETERMINED. ALL MEASURED DATA WERE CORRELATED TO EQUATIONS WHICH ENABLED A CONSTRUCTION OF DIAGRAMS FOR THE PRACTICAL USE. Programme(s) PRE-ENNONUC 2C - Energy research and development programme (EEC), 1979-1983 Topic(s) Data not available Call for proposal Data not available Funding Scheme Data not available Coordinator UNIVERSITY OF ESSEN EU contribution No data Address Universitatsstrasse 15 45117 ESSEN Germany See on map Total cost No data
