This simulator models how scale buildup and non-condensable gases degrade evaporative condenser performance. As scale accumulates on heat-transfer surfaces, the simulator shows reduced heat rejection, rising condensing temperature, increased discharge pressure, and higher compressor energy use. When non-condensables are introduced, the simulator demonstrates loss of effective heat-transfer area, elevated head pressure, unstable operation, and reduced system capacity. Users can vary fault severity and observe real-time impacts on pressures, temperatures, approach, and overall system efficiency—mirroring what occurs in real ammonia refrigeration systems.