Carbon dioxide (R-744) is one of the naturally occurring compounds collectively known as “natural refrigerants.” It is nonflammable and nontoxic, with no known carcinogenic, mutagenic, or other toxic effects, and no dangerous products of combustion. Using carbon dioxide in refrigerating systems can be considered a form of carbon capture, with a potential beneficial effect on climate change. It has no adverse local environmental effects. In recent years, CO2 has once again become a refrigerant of great interest. However, high-pressure CO2 systems [e.g., 490.8 psia (3.4 MPa) at a saturation temperature of 30°F (-1°C), or 969.6 psia (6.7 MPa) at 80°F (26.7°C)] present some challenges for containment and safety.
Applications
System Design
System Safety
Piping
Heat Exchangers and Vessels
Compressors for CO2 Refrigeration Systems
Lubricants
Evaporators
Defrost
Installation, Start-up, and Commissioning
ISBN: 978-1-939200-98-3 (for SI versions of chapters)
ISSN: 1930-7217 (for SI versions of chapters)
Citation: 2018 ASHRAE Handbook–Refrigeration
Product Details
- Published:
- 2018
- ISBN(s):
- 9781939200983
- Number of Pages:
- 12
- Units of Measure:
- SI
- File Size:
- 1 file , 770 KB
- Product Code(s):
- D-R032018SI
