Uploaded March 2026 | Updated September 2026, 3 weeks ago
How do metro trains stay warm during freezing winters? The answer lies in CO₂ heat pump air-conditioning technology developed by CRRC Dalian Institute. Using carbon dioxide as a refrigerant and advanced transcritical cycle technology, the system delivers stable heating even in extreme cold, maintaining a comfortable cabin temperature for passengers.
Compared with conventional air-conditioning systems, the CO₂ heat pump operates across a wider temperature range and achieves higher energy efficiency. It can save over 80,000 kWh of electricity per train each year on northern above-ground lines, while reducing energy consumption by more than 20–30%. Designed for both performance and sustainability, this technology helps make winter journeys warmer, greener, and more reliable.
How do metro trains stay warm during freezing winters? The answer lies in CO₂ heat pump air-conditioning technology developed by CRRC Dalian Institute. Using carbon dioxide as a refrigerant and advanced transcritical cycle technology, the system delivers stable heating even in extreme cold, maintaining a comfortable cabin temperature for passengers.
Compared with conventional air-conditioning systems, the CO₂ heat pump operates across a wider temperature range and achieves higher energy efficiency. It can save over 80,000 kWh of electricity per train each year on northern above-ground lines, while reducing energy consumption by more than 20–30%. Designed for both performance and sustainability, this technology helps make winter journeys warmer, greener, and more reliable.
