Final answer:
In a packaged chiller with an economizer, the vapours from the economizer enter the second stage of the compressor. This is part of a cycle where the evaporator facilitates the transformation of refrigerant from liquid to gas, which is then compressed, condensed back into liquid and cooled through expansion.
Step-by-step explanation:
In a packaged chiller with an economizer, the vapours from the economizer enter the second stage of the compressor. This occurs after the vapours are initially compressed and cooled before being introduced to the second stage for further compression. The process begins when the evaporator converts liquid refrigerant into gas (vapor). Then, the compressor raises the temperature and pressure of the gas and directs it into the condenser, where heat transfer occurs, causing the gas to condense into a liquid. After that, the liquid refrigerant travels through a pressure-reducing valve and returns to the evaporator coils, being cooled through expansion to continue the refrigeration cycle.