compare the PH diagrams of different refrigerants commonly used in automotive air conditioning systems, such as R134a, R1234yf, and R744 (carbon dioxide). By analyzing the pressure and enthalpy values at various points in the system, including the compressor, condenser, evaporator, and expansion valve Comparative Analysis: 1. Present the PH diagrams for each refrigerant, clearly labeling the various points in the system where analysis will be performed. 2. Analyze the pressure and enthalpy values at each point for each refrigerant and compare their performance characteristics. 3. Comment on any noticeable differences in the pressure and enthalpy values between the refrigerants. 4. Discuss the implications of these differences on system efficiency, cooling capacity, and environmental impact.