Patent attributes
The intermittent absorption system with a liquid-liquid heat exchanger includes two generator/absorber units that operate out-of-phase, a solar collector unit, a dephlegmator, a condenser unit, an evaporator, and valves to control the flow of aqua-ammonia coolant through the system. The system operates on a two-day cycle. On the first day, during the daytime, the first generator/absorber unit generates liquid ammonia, while on the second day of the cycle, the roles are reversed, the second generator/absorber unit generating liquid ammonia. At the start of each day, one generator/absorber unit is partially pressurized and the other partially depressurized by liquid-liquid heat exchange between their heat exchangers, followed by disconnecting the heat exchangers from each other and connecting the generator to the solar collector to complete pressurization. The liquid-liquid heat exchange between the generator/absorber units reduces the heat required from the solar collector to generate liquid ammonia refrigerant, improving the coefficient of performance.
