Cycle of Ammonia-Water System (Air Conditioning)

Cycle of Ammonia-Water System (Air Conditioning) Points : cycle of ammonia-water system (air conditioning) In ammonia —water absorption system, ammonia is the refrigerant and water is the absorbent. THE CYCLE As the liquid animonia flows into the low pressure evaporator, some of the ammonia flashed to a vapor. As a result, the remaining ammonia liquid is chilled and begins to remove heat from the water passing through the evaporator. The resulting cool water is then used to co1 the space to be air conditioned. The pickup of heat from the water causes more ammonia to vaporize, resulting in more cooling.

After the ammonia picks up heat in the evaporator ammonia vapor is attracted to the absorber by the pull of the water. The ammonia vapor combines with mixture of ammonia and water flows to the generator. In the generator, the mixture is heated until it percolates. The ammonia refrigerant is now in the vapor state and separates from the water absorbent. As the ammonia and water vapors coming off the generator rise up through the analyzer they are cooled, and the water vapor having the highest saturated temperature condenses and drains back to the generator which the ammonia vapor continues to rise and leaves at the top of the analyzer. The ammonia vapor then passes to the rectifier or reflux condenser where the remaining water vapor and a small amount of ammonia vapor condense and drain back through the analyzer in the form of weak reflux solution cooling for the reflux condenser is usually accomplished with a portion of the condenser water and is limited in order to control the amount of reflux liquid going to the analyzer.

The pressurized ammonia vapor flows to the condenser. As heat is removed from the ammonia vapor due to the water flowing through the coil, the vapor is cooled and returns to a liquid form. The liquid ammonia then flows the through a metering device and flashed into the evaporator. The ammonia refrigerant is again a vapor and the cycle beings again.