Skip to main content
European Commission logo print header
Contenido archivado el 2019-03-15

PERIODICALLY OPERATING ABSORPTION HEAT PUMP

Objetivo



A WAY TO AVOID THE USE OF A SOLUTION PUMP IN AN ABSORPTION HEAT PUMP IS TO USE A PERIODICALLY ABSORPTION HEAT PUMP. THIS HEAT PUMP CONSISTS OF TWO RESERVOIRS WHERE LIQUIDS ARE SEPARATED, BUT WHERE VAPOURS CAN FREELY MOVE FROM ONE RESERVOIR TO ANOTHER. THEY ARE USED AS A GENERATOR AND CONDENSOR FOR HALF A PERIOD AND AS AN ABSORBER AND EVAPORATOR FOR THE OTHER HALF PERIOD. DURING THE GENERATOR/CONDENSOR PHASE, HEAT IS GIVEN TO THE GENERATOR AND VAPOUR IS CONDENSED IN THE CONDENSOR WHERE HEAT IS EXTRACTED. IN THE ABSORPTION/EVAPORATOR PHASE LOW GRADE HEAT IS USED TO EVAPORATE THE FLUID WHICH IS ABSORBED IN THE ABSORBER WHERE NOW HEAT IS EXTRACTED. THE CYCLE TIME IS 1 - 1 1/2 HOUR. INITIALLY THE COMBINATION LIBR AND PURE CH3OH WAS USED. MAJOR PROBLEMS WERE MASS AND HEAT TRANSFER. BY ADDING WATER TO LIBR/CH3OH THE OPERATION OF THE HEAT PUMP IMPROVED CONSIDERABLY. ADDING WATER, SHIFTS THE SOLVABILITY AREA OF THE LIBR/CH3OH MIXTURE TOWARDS LOWER TEMPERATURES THUS PREVENTING CRYSTALLIZATION AT ROOM TEMPERATURES FOR SALT CONTENTS BETWEEN 0 AND 57 %. A 10 KW PROTOTYPE WAS BUILT PRODUCING HEAT AT 35 - 55 DEGREES WITH AN EFFICIENCY OF 1,23; THE GENERATOR AND HEAT SOURCE TEMPERATURES WERE 120 DEGREES C AND 0 - 15 DEGREES C RESPECTIVELY. THERE IS STILL MUCH SCOPE FOR IMPROVEMENTS.

Tema(s)

Data not available

Convocatoria de propuestas

Data not available

Régimen de financiación

Data not available

Coordinador

Rheinisch-Westfälische Technische Hochschule Aachen (RWTH)
Aportación de la UE
Sin datos
Dirección
Schinkelstraße 8
52062 Aachen
Alemania

Ver en el mapa

Coste total
Sin datos