Compression Mechanism

To compress the refrigerant, the spiral compressor (also known as the scroll compressor) is used.

After three revolutions, the refrigerant drawn in is compressed and heated and can escape in a gaseous state through an opening in the center of the outer disk. From here, gaseous refrigerant with high temperature and high pressure escapes via an oil separator at the connection of the air conditioning compressor towards the condenser.

Fig 1: Comparison Of Cooling Power Of Belt-Driven And An Electric A/C Compressor

Courtesy of BMW OF NORTH AMERICA, INC.

Comparison of the cooling power of a belt-driven and an electric A/C compressor
Comparison of the mechanical and electrical power consumption of a belt-driven and an electric A/C compressor

BELT-DRIVEN AND AN ELECTRIC A/C COMPRESSOR EXPLANATION CHART

Index	Explanation
1	Cooling power of a belt-driven air conditioning compressor as a function of the speed of the combustion engine
2	Cooling power of an electric A/C compressor as a function of the speed of the electric motor
3	Mechanical power consumption of a belt-driven air conditioning compressor as a function of the speed of the combustion engine
4	Electrical power consumption of the electric air conditioning compressor as a function of the speed of the synchronous motor

Fig 2: Identifying Electric A/C Compressor

Courtesy of BMW OF NORTH AMERICA, INC.

Fill out the following table with the information provided by the facilitator.

ELECTRIC A/C COMPRESSOR EXPLANATION CHART

Index	Explanation
1
2
3
4
5
6
7

Fig 3: Identifying Electric A/C Compressor Scroll-Principle

Courtesy of BMW OF NORTH AMERICA, INC.

ELECTRIC A/C COMPRESSOR SCROLL-PRINCIPLE EXPLANATION CHART

Index	Explanation
1	Inner disk with spiral profile
2	Outer disk with spiral profile
3	Intake openings for the refrigerant

Explain the scroll-principle.