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Gas Technologies: Engine-Driven Chillers

How They Work
Engine-driven chillers operate similarly to other vapor compression chillers with the exception that they use a natural gas engine as a prime mover rather than an electric motor. The refrigerant leaves the condenser as a high pressure liquid. On the way to the evaporator, the refrigerant flows through an expansion valve, lowering the refrigerants pressure. In the evaporator the refrigerant absorbs heat and is vaporized. This change of state causes the cooling effect. The compressor, powered by an electric motor compresses the refrigerant raising its pressure and temperature. At this point, the refrigerant is much hotter than the outdoor air. As it passes through the condenser coils, it changes back to liquid form, releasing the heat gained from the compressor and evaporator.