The Hand Warmer project
As you can see if you click on the link in the button above we have just completed the hand warmer project. This was project was filled with more test and prototypes then usual so I'm going to walk you through the creation and final product.
Pre Prototyping
Before we even started brainstorming ideas of how we where going to build it we had to complete many labs learning how the combination of different kinds of salt and water lead to a heat change and we learned how to measure that heat change and the science behind it.
Prototyping
In my group we jumped straight into building prototypes and as you can see in the presentation we jumped around with the design. We started with a lot bag of water with a small poppable bag of salt inside and through test and failure we kept on downsizing and eventually swapped the poppable bag from being the salt to being the water.
What salt to use
With our decision on what salt to use we used data we had collected from the labs and the book to choose the salt that released the most joules of heat while also being cheap. This lead us to the choice of Lithium Chloride.
Overview
This Project opened our eyes to a lot of things we struggle with that we haven't faced before. The biggest thing has to be that we struggled making multiple working prototypes. We were able to build on well working prototype but because it was a one time use the one we attempted to make mimicking the first didn't come out as good. The other thing we had issues with was the group continue work while I was absent. It seemed that when I would miss a day I would come back and nothing changed. But what we did do well was calculating all the science behind the hand warmer first and we never had disagreements on design.
Pre Prototyping
Before we even started brainstorming ideas of how we where going to build it we had to complete many labs learning how the combination of different kinds of salt and water lead to a heat change and we learned how to measure that heat change and the science behind it.
Prototyping
In my group we jumped straight into building prototypes and as you can see in the presentation we jumped around with the design. We started with a lot bag of water with a small poppable bag of salt inside and through test and failure we kept on downsizing and eventually swapped the poppable bag from being the salt to being the water.
What salt to use
With our decision on what salt to use we used data we had collected from the labs and the book to choose the salt that released the most joules of heat while also being cheap. This lead us to the choice of Lithium Chloride.
Overview
This Project opened our eyes to a lot of things we struggle with that we haven't faced before. The biggest thing has to be that we struggled making multiple working prototypes. We were able to build on well working prototype but because it was a one time use the one we attempted to make mimicking the first didn't come out as good. The other thing we had issues with was the group continue work while I was absent. It seemed that when I would miss a day I would come back and nothing changed. But what we did do well was calculating all the science behind the hand warmer first and we never had disagreements on design.