Our technology

  • 01.

    Stirling engine (fluid = helium)

    • T = 100-550°C, Load following, batch processes
  • 02.

    Fast near-isothermal compression

    • COP up to 3.5
    • Up to 86% of Carnot efficiency
  • 03.

    No sliding/rotating seals

    • 5x less maintenance

Our heat pump harvests available waste heat at any temperature from 210°F/100°C to 930°F/500°C, or atmospheric heat down to -60°F/-50°C, and runs a near-ideal Stirling-like thermodynamic cycle to upgrade this heat to the desired process temperature.

Our heat pump uses Helium (R704) as the working gas, and various heat transfer fluids depending on the source and sink temperatures. It even works with intermittent processes requiring heat in bursts/duty cycles, or heat at temperatures that strongly vary in time (high glide). Its extremely simple mechanical design allows very low maintenance and downtime.

Depending on the set of temperatures, the Carnot efficiency can reach up to 86%, compared to about 60% for best-in-class high temperature heat pumps today.

Source (in) temperatureSupply (out) temperatureHeat transfer fluid combination (cold side - hot side)
20°C – 80°C
68°F – 176°F
200°C – 550°C
392°F – 1022°F
Water –Molten salt (HITEC or Nitrate)
200°C – 520°C
392°F – 968°F
230°C – 550°C
446°F – 1022°F
Molten salt – Molten salt (HITEC or Nitrate)
-50°C – 220°C
-58°F – 428°F
-20°C – 250°C
-4°F – 482°F
Thermal oil – Thermal oil
-50°C – 250°C
-58°F – 482°F
200°C – 550°C
392°F – 1022°F
Thermal oil – Molten salt (HITEC or Nitrate)