The Working Principle
The cooling principle
The input heat energy heats LiBr solution to 140°C and generate vapor, which is then condensed into water by cooling water. When the refrigerant water enters evaporator (in high vacuum condition), its temperature goes down immediately to 5°C and is sprayed over the evaporator tubes, to make chilled water drop down from 14°C to 7°C to make cooling. The refrigerant water absorbs heat from air conditioning system and evaporates, then is absorbed by concentrated LiBr solution from the generators. The cooling water takes away the heat and rejects it into the air. Diluted solution is pumped into HTG and LTG separately to be heated to begin the process all over again.
The heating principle
The input heat energy heats the LiBr solution. The vapor produced by the solution heats the heating water or hot water in tubes, while condensate returns to the solution to be heated and the cycle repeats. As "separate heating" is adopted, the heating cycle becomes very simple, just like a vacuum boiler. Therefore, the lifespan of the chiller can be doubled. A separate heat exchanger can provide dedicated hot water while cooling or heating operation is stopped. BROAD uses this technology to realize "three functions in one unit": cooling, heating and hot water simultaneously or dedicatedly.