CO₂ 120 – Properties of R‑744 (Carbon Dioxide)

Understand the thermodynamic behavior that defines CO₂ refrigeration systems.

Focuses on the thermodynamic and physical properties of CO₂ (R‑744) used in refrigeration systems.

Overview

CO₂ exhibits thermodynamic properties that differ significantly from traditional industrial refrigerants. High operating pressures, a low critical temperature, and unique phase behavior influence how CO₂ systems are designed and operated.

This course explains the properties of R‑744 and shows how those properties drive system behavior, safety considerations, and the need for transcritical operation in many applications.

Ideal For

• Operators and technicians working with CO₂ systems
• Engineers learning CO₂ refrigeration fundamentals
• Anyone transitioning from ammonia or HFC systems to CO₂

Core Learning Objectives

• Describe key thermodynamic properties of CO₂
• Identify critical and triple points of R‑744
• Understand why CO₂ systems operate transcritically

Topics

• Introduction to CO₂ and R‑744
• Pressure, Density, and Temperature Relationships
• Critical and Triple Points
• The Carnot Cycle
• Water Contamination in CO₂ Systems
• Safety Aspects of R‑744