What Is The Operating Pressure Range for a CO₂ Dry Cooler?

What is the operating pressure range for a CO₂ dry cooler?

The operating pressure range for a CO₂ dry cooler typically falls between 8 MPa and 14 MPa. Specific values dynamically vary depending on the refrigeration system type (particularly transcritical cycles) and operating conditions.

Core Pressure Range and Determining Factors

The pressure of a CO₂ dry cooler is not a fixed value; it is primarily determined by the type of refrigeration cycle it is applied to and the actual operational requirements. There are two core influencing factors:

Cycle Type Variations: In mainstream transcritical CO₂ refrigeration cycles, the dry cooler operates on the high-pressure side and must withstand supercritical pressures, typically maintained between 8MPa and 12MPa. When used in subcritical cycles (less common), pressures are relatively lower, generally ranging from 5MPa to 8MPa.

Operating Condition Fluctuations: Even within the same system, pressure varies with external conditions and load changes. For instance, rising ambient temperatures increase heat dissipation difficulty for the dry cooler, potentially raising internal pressure to 12MPa - 14MPa. Conversely, lower ambient temperatures or reduced cooling loads may decrease pressure to 8MPa - 10MPa.

Critical Significance of Pressure Control

Ensuring System Efficiency: Excessive pressure increases compressor power consumption and reduces refrigeration efficiency; conversely, insufficient pressure may lead to inadequate cooling capacity, failing to meet temperature reduction requirements.

Guaranteeing Equipment Safety: Carbon dioxide readily enters a supercritical state under high pressure, altering its physical properties. Dry cooler design pressure must align with the system's maximum operating pressure to prevent equipment leakage or damage caused by pressure overloads.