On the Sublimation of Dry-Ice: Experimental Investigation and Thermal Modelling of Low-Temperatures on a Sandy Soil

Abstract

In the last decade, growing awareness about CO2 emissions is supporting the authorities in a more sustainable society. The proposed solutions embrace different topics, such as renewable energy implementation, lower waste production, and carbon capture and storage technologies (CCS). The latter is based upon the best available knowledge about the thermophysical properties of CO2, which are not always satisfactory for its complete characterization. In this work, it is investigated the interaction of the CO2 in solid phase (dry-ice) with sandy soil, a phenomenon that can potentially occur following pipeline ruptures. An experimental setup and a numerical model have been developed to measure and validate the temperature profiles beneath the dry-ice bank at steady-state conditions. The model has been validated with the experimental data by defining a suitable range of the thermal conductivity at the solid phase (0.25–0.30 W m−1 K−1) that led to the best match (deviation of 7.81%). Finally, the overall heat transfer coefficient (85.56–86.35 W m−2 K−1) has been numerically calculated.

Novel recycling of plastic waste into high impact resistant ultralightweight thermally insulated hybrid composite

“…Sublimation is the process by which carbon dioxide (CO₂) transforms from a solid to a gas without first going through a liquid state at temperatures higher than À56°C. 9 For this test, 5 kg block of solid dry ice with temperature À78.6°C was employed. The setup was carried out in a semi-closed thermally insulating chamber, and the temperature was monitored for 24h.…”

“…People in India, particularly in the Himalayan region where the border span is more than 4200 km the temperatures plummet to À20°C to À40°C, often experience problems with frozen septic tanks or water tanks. 9 Few of the reasons that could lead to this are due to static water conditions, tank overflows and improper design of the structure. 10 Traditionally, Concrete tanks have been utilized as septic tanks and water storage tanks.…”