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Heat pump tech is 170 years old. Pascal thinks it's time for an update

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Pascal, founded by Adam Slavney (CEO) and Jinyoung Seo (CTO) from Harvard research, turned an unexpected experimental result into a company that raised $8.5 million in a follow-on seed round led by Sazze Partners and LB Investment with participation from KDB Silicon Valley. While swapping gases during high‑pressure measurements, the team uncovered a distinct pathway for solid‑state cooling and validated it over one to two years. The startup has a pilot contract with a multinational beverage company, plans its first prototype early next year, and aims to produce a batch of more polished refrigerators in 2028.

Rather than relying on traditional vapor refrigerants or compressing bulk solids, Pascal compresses carbon dioxide into cartridges filled with a proprietary sponge‑like porous material. CO2 molecules bouncing against pore walls transfer energy to the host, which a heat exchanger then rejects or absorbs; two cartridges alternate duties and reverse flow as they heat and cool. The system reportedly boosts efficiency by about 20% over existing models, avoids atmospheric leakage risks associated with gaseous refrigerants, has been cycled up to 300,000 times in testing, and operates at lower pressures than other solid‑state approaches, allowing use of conventional, lower‑cost components.

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