Hi all! I need to figure out a way I can predict the temperature range a small container of water (neglect properties small container and focussing on the water itself) will hold within an insulated expanded polystyrene (EPS) box of a given thickness, over a period of time. We can assume the ambient temperature is constant outside the EPS box. Surrounding the small container of water will be some frozen (~ -20ºC) water packs and some refrigerated (~ 5ºC) water packs that will all fit inside the EPS box. So a 2D cross section would show the layers in this order (outermost to innermost): EPS, Frozen water pack, refrigerated water pack, container of water. All the dimensions would initially be provided. I have some testing to do and this would REALLY save me some time. I haven't done any thermo in a long time so I'm sort of struggling with this one. I'm not looking for anything solved, just the necessary steps required and formulas associated. Thanks!