3 ms·

> they have powerful ventilation and aircon systems ... well ... the ICEs AC is known to fail regularly at elevated temperatures :-)

• kuschku 4y ago
  Well, they were designed to survive everything except an every-100-years summer (36°C sustained outdoor temperatures) back in the 80s, which now happens to be every summer. Even the trains ordered in 2000 were designed for an every-100-years summer (40°C sustained outdoor temperatures) which now some regions are hitting every year as well. The issue isn’t the ACs, the real issue is climate change ;)
  • namibj 4y ago
    But per Carnot, maintaining a fixed temperature differential against a fixed thermal resistance is cheaper (requires less work) at a higher temperature (1/(1-(Tcold/Thot)) is the carnot-limited "coefficient of performance" for a heat pump). So theoretically they should be able to maintain the design differential even at higher outdoor temperatures, causing indoor temperatures to raise from ~21°C to 26°C comparing the "still works at 35°C" and "40°C happens regular in $current_year".
    • danuker 4y ago
      But of course people using the coolers are keeping the temperature constant (not the differential, and therefore pushing the pumps harder).
      • namibj 4y ago
        Well, then maybe those need some self-protection to not overexert themselves when the temperature gradient is too steep.