Advanced Refrigeration System Quiz

What is the primary purpose of using a two-stage refrigeration system in this project?

• To increase the efficiency of heat absorption from the environment

• To achieve lower temperatures than a single-stage system can provide

• To use less refrigerant overall

• To simplify the construction and maintenance of the system

At what pressure does ethylene condense in the described system?

• Below 10 bar

• At atmospheric pressure

• Above 20 bar

• Around 15 bar

What is the function of the oil separator in the refrigeration system?

• To coalesce oil droplets and prevent system clogging

• To increase the flow rate of the refrigerant

• To prevent the compressor from overheating

• To remove impurities from the ethylene

Why is brazing preferred over soldering in constructing refrigeration systems?

• It is less expensive

• It requires less skill

• It provides stronger joints capable of handling higher pressures

• It is faster to apply

What is the role of the intercooler in the refrigeration system?

• To cool the refrigerant before it enters the evaporator

• To heat the refrigerant before it enters the compressor

• To transfer heat from the second stage to the first stage refrigerant

• To store excess refrigerant temporarily

How did the creator test for leaks in the refrigeration system?

• By using a special chemical detector

• By submerging joints in water and observing for bubbles

• By measuring the temperature drop across the system

• By listening for hissing sounds at the joints

What was the main issue encountered with the ethylene used in the refrigeration system?

• It evaporated too quickly, reducing efficiency

• It was contaminated, leading to higher than expected pressures

• It was too pure, causing over-condensation

• It froze in the pipes, blocking the system

What was the primary reason for the inefficiency observed in the refrigeration system?

• Use of an inappropriate type of refrigerant

• Incorrect sizing of the capillary tubes

• Low flow rate of the refrigerant due to compressor limitations

• Inadequate insulation of the intercooler

What future improvement is planned for the refrigeration system?

• Increasing the size of the buffer tank

• Switching to a different type of refrigerant

• Purifying the ethylene to remove hydrogen contamination

• Using a more powerful compressor

What was the outcome of using propane and propylene in the system?

• They caused the system to overheat and fail

• They did not condense at the expected temperatures

• They were too volatile and dangerous to use

• They provided a slight improvement in performance