Hi guys, i'm designing a cooling device as part of a project and need a little help with the maths. OK, so the scenario is this, take boiling water, put it in a stainless steel container with Thermal Conductivity of 8.7 Btu/h ft °F and dimensions of 15.811cm x 15.811cm x 1 cm to store 250ml of water with a wall depth of 4.7625mm. What i'm struggling to find out right now is how long it will take to cool the water to 20c. I'm looking to cool the water as quick as possible so i'm looking at a passive system as described above and then to implement a forced system and add fins to both sides to improve heat transfer rate. I've got to cool the water to room temperature in around 7 minutes and the maths is killing me even to figure out the passive system so i guess with a heat sink type design and implement a forced air flow it's going to get even worse but i'm hoping you guys are in the mood to be helpful if you can.