Which refrigerant is associated with very high pressure and used in transcritical CO2 systems?

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Multiple Choice

Which refrigerant is associated with very high pressure and used in transcritical CO2 systems?

Explanation:
R-744, which is carbon dioxide. CO2 has a very high critical pressure—about 73.8 bar—and a critical temperature of 31.1°C, so in transcritical CO2 systems the refrigerant often operates at pressures well above those of many other refrigerants. This high-pressure behavior is what makes transcritical designs distinct, requiring components rated for strong pressures and control strategies suited to supercritical operation. The other listed refrigerants have different pressure characteristics and aren’t the baseline for transcritical CO2 cycles.

R-744, which is carbon dioxide. CO2 has a very high critical pressure—about 73.8 bar—and a critical temperature of 31.1°C, so in transcritical CO2 systems the refrigerant often operates at pressures well above those of many other refrigerants. This high-pressure behavior is what makes transcritical designs distinct, requiring components rated for strong pressures and control strategies suited to supercritical operation. The other listed refrigerants have different pressure characteristics and aren’t the baseline for transcritical CO2 cycles.

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