Work

Resolving passive heat transfer and phase‐change heat in cryogenic CO 2 deposition (Desublimation) from CO 2 / N 2 mixtures

Year: 2026

Type: article

Abstract: In cryogenic CO 2 desublimation systems where phase change dominates both heat transfer and separation, conventional lumped thermal‐resistance treatments embed interfacial latent heat into an overall heat‐transfer coefficient, obscuring how phase‐change heat is partitioned between the gas phase and the coolant and limiting diagnostic insight into energy efficiency. In this study, CO 2 desublimation experiments were conducted using CO 2 /N 2 mixtures, and a coupled heat‐ and mass‐transfer model incorporating phase‐change effects was developed. By explicitly treating the latent heat released at the gas–solid interface as an internal heat source within a thermal‐resistance network, a heat‐splitting performance index (HSPI) was introduced to quantify the fraction of latent heat coupled to the coolant side. The results show that both CO 2 recovery and coolant‐side latent‐heat utilization increase monotonically with the inlet CO 2 mole fraction, highlighting feed‐gas composition as a key determinant of separation performance and energy efficiency in cryogenic CO 2 capture.

Source: AIChE Journal

DOI: 10.1002/aic.70468

Authors: Shengwen Xiao, Hiroshi Machida, Koyo Norinaga

Institution: Nagoya University

Language: English

Topic: Carbon Dioxide Capture Technologies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Climate action, Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $4,940