Envision Engineering & Skill Development

A screw type compressor shows over-temperature primarily due to poor cooling caused by inadequate ventilation, high ambient temperatures, or clogged oil/air filters. Other reasons include insufficient or incorrect oil levels/viscosity, a malfunctioning thermal valve, or a faulty aftercooler.

a domestic Electrolux (ammonia absorption) refrigeration system in a block diagram form. A gas burner provides heat to the generator, which contains an ammonia-water (NH₃–H₂O) solution. As the mixture boils, ammonia v***r separates and moves through a rectifier to remove excess water. The pure ammonia v***r then condenses in the condenser, turning into liquid ammonia. In the ev***rator, liquid ammonia mixes with hydrogen gas (H₂), lowering its partial pressure and causing it to ev***rate, thus absorbing heat and creating a cooling effect. Meanwhile, the weak ammonia-water solution flows to the absorber, where it reabsorbs ammonia v***r, forming a strong solution again. A heat exchanger improves efficiency by transferring heat between the hot strong solution and the cold weak solution, completing the cycle.

This diagram represents the components and flow of an air-cooled chiller system, which is designed for efficient cooling. The system consists of several interconnected parts, starting with the compressor (1) and oil separator (2), which help in compressing and separating oils from the refrigerant. The high-pressure gauge (3) and condenser (4) regulate the pressure and heat exchange process, while the expansion valve controls refrigerant flow. The system also includes a circulation pump (16) and an ev***rator tank (12) to manage heat absorption and transfer. Other components, such as the solenoid valve (6), filter dryer (7), and heater (15), ensure proper refrigerant flow, filtration, and temperature regulation. The city water supply (11) and the by-pass valve (18) allow for flexible operation, while the low-pressure gauge (10) monitors system pressure. The diagram illustrates the flow and interaction of the cooling process, highlighting the complexity of an air-cooled chiller's function in temperature management systems.