Objetivo A MONOVALENT ABSORPTION HEAT PUMP OF 10 KW IS BEING DEVELOPED WHICH WILL DELIVER HEAT AT 70 DEGREES C. THIS IN ORDER TO BE USED WITH EXISTING RADIATORS IN AN EXISTING BUILDING. A FIRST WORKING FLUID PAIR WHICH WAS INVESTIGATED (METHANOL/MIXED BROMIDE) DID NOT OPERATE SATISFACTORILY DUE TO THE DECOMPOSITION OF METHANOL AT 190 DEGREES C. SINCE THEN EXTENSIVE SCREENING TESTS HAVE BEEN CARRIED OUT IN A SEARCH FOR NEW FLUID PAIRS. THIS INCLUDED WATER AS A REFRIGERANT IN COMBINATION WITH SALT. ALSO THE WORKING FLUIDS, METHALAMINE AND TRIFLUORETHANOL HAVE BEEN INVESTIGATED BUT THE LAST FLUID IS NOW CONSIDERED TO HAVE INACCEPTABLE HIGH TOXITY LEVELS. APART FROM TOXITY THE MAIN CRITERIA ARE TEMPERATURE LIFT AND PREVENTION OF CRYSTALLIZATION. PRELIMINARY RESULTS SHOW THAT SATER-SALT SOLUTIONS HAVE A POTENTIAL TO BE USED FOR A HIGH TEMPERATURE HEAT PUMP. SODIUM-HYDROXIDE APPREARS TO BE THE MOST ATTRACTIVE ABSORBENT BUT IS VERY CORROSIVE. SOLUTIONS FOR THIS CORRISIVITY HOWEVER MAY BE FOUND. INTERESTING SUGGESTIONS HAVE BEEN MADE TO AVOID CRYSTALLIZATION. TO SOLVE THE PROBLEM OF WATER FREEZING AT 0 DEGREE C, EITHER 20 % ETHYLENE GLYCOL OR 15 % CACL2 WAS ADDED. IN THIS WAY HEAT PUMPS CAN OPERATE WITH EVAPORATOR TEMPERATURES DOWN TO - 7 DEGREES C. Programa(s) PRE-ENNONUC 2C - Energy research and development programme (EEC), 1979-1983 Tema(s) Data not available Convocatoria de propuestas Data not available Régimen de financiación Data not available Coordinador CRANFIELD UNIVERSITY Aportación de la UE Sin datos Dirección MK43 0AL BEDFORD Reino Unido Ver en el mapa Coste total Sin datos
