𝗧𝘄𝗼 𝘁𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹𝗹𝘆 𝘃𝗲𝗿𝘆 𝗱𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁𝘀 𝗰𝗮𝘂𝗴𝗵𝘁 𝗺𝘆 𝗮𝘁𝘁𝗲𝗻𝘁𝗶𝗼𝗻 𝗿𝗲𝗰𝗲𝗻𝘁𝗹𝘆.

 

➡️ 𝗕𝗮𝗿𝗼𝗰𝗮𝗹𝗼𝗿𝗶𝗰 𝗰𝗼𝗼𝗹𝗶𝗻𝗴 𝗶𝘀 𝘁𝗵𝗲 𝗳𝗶𝗿𝘀𝘁.

Instead of adapting a conventional refrigerant cycle, it uses pressure-induced thermal effects in solid-state materials.

Recent results are interesting not only because of the reported entropy change — around 125 J/kg·K at approximately 7.5 MPa — but because lower operating pressure could simplify pressure generation, sealing, losses and cycling.

Projects such as FROSTBIT are therefore working not only on the material itself, but on pressure generation and recovery, heat transfer, cycling and system integration.

In this case, the innovation is not about finding another refrigerant.

It changes the refrigeration mechanism itself.

𝗧𝗵𝗲 𝘀𝗲𝗰𝗼𝗻𝗱 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 moves in the opposite direction:
➡️ 𝘄𝗮𝘁𝗲𝗿-𝗯𝗮𝘀𝗲𝗱 𝗵𝗶𝗴𝗵-𝘁𝗲𝗺𝗽𝗲𝗿𝗮𝘁𝘂𝗿𝗲 𝗵𝗲𝗮𝘁 𝗽𝘂𝗺𝗽𝘀.

Here, vapour compression remains, but the properties of the working fluid force the machine to change around it.

R-718 offers zero GWP, zero ODP, non-toxicity and non-flammability. But its very low vapour density creates extremely high volumetric flow rates, shifting the challenge toward compressor architecture, multistage compression and system integration.

➡️ And this is not independent of scale.

At multi-MW capacity, turbo-compressors can manage these flow rates effectively. At smaller capacities, the required displacement becomes disproportionately large, making R-718 structurally better suited to centralized industrial applications.

These two approaches are technically far apart, but they point to the same broader development:
➡️ innovation is no longer moving along one technical axis.
▪️ Some technologies change the working fluid.
▪️ Some force a redesign of the compressor architecture.
▪️ Others change the refrigeration mechanism itself.

What seems to be emerging is a more fragmented technical landscape, where architecture, scale and operating conditions increasingly determine which solution makes sense.