| Three versions of frozen water filled High Density Polyethelyne (HDPE) containers are used to cool experiments in a passive carrier (LoTEC(c)) when being transported to and from the International Space Station. Dissolved gases (air) are present in the water and occupy critical space in ice that could be used to store additional water. Reducing the dissolved gases involves bubbling an inert gas (helium) into water to reduce dissolved gas concentrations, and allows for additional water to be stored within the container. An analysis of the physical properties of the HDPE container is also accomplished. Experimental data is recorded of the internal dissolved gas concentration levels within the water filled containers with respect to time. Using this data, the permeability coefficient and diffusion coefficient are calculated analytically. These numeric calculations are compared to the experimental data, and validate the accuracy of the model of the mass transfer of the system. The data show that approximately 35 mL of water could be added to a 2 liter container if the water is sparged with helium before freezing. However, the permeability of the container allows the air to re-dissolve in water. A less permeable container is needed to take advantage of the sparging process. |
