HAND WARMER CHALLENGE
PURPOSE:
We plan to make a cost effective hand warmer to sell through our school at the cold winter sporting events with a 20 degree temperature change.
OUR PROJECT:
Our final product turned out to be two separate compartments. One side is filled with water and the other side is filled with Calcium Chloride. We decided to leave space at the top where when turned upside down and unclipped the salt and water will mix. Within 15 seconds the hand warmer should raise drastically in temperature and stay warm for around 4 minutes without the outer fabric. With the fabric it should stay warm form somewhere between 8-10 minutes.
As for the inner chemicals, we ended up using 3.5 grams of CaCl20 ml of water. we did many calculations to
If we could have done something differently, we would have change the size of the hole for the water entry. it made it somewhat challenging to transfer the water over with such a small hole. We want our design to be easy to use so people will want to spend their money on our projects.
COST:
Business source binder clips- $0.55 per dozen clips
Heat sealer- free (provided by Vogl)
Water - free
CaCl- $6.55 per 500 grams… $0.04 cents for each hand warmer
So it would take four dollars to produce 100 (in terms of calcium chloride)
Pack of 347 bags- $20
To make 100 hand warmers it would cost $28.58 (0.28 for one)
At a reasonable price we would charge $1.00, we would make a huge profit
The reusable pouch would not be included it would cost $2.00
When people come back with reusable pouch the cost of hand warmer would be cut in half as “half off refill”
REFLECTION:
I enjoyed doing this project. Although, it was hard to grasp the concept of the calculations. I felt a little as if we as a group were lost a lot of the time forcing us to rush at the end, which was our faults for not reaching out for separate help, but it ended up working out. I believe our group pulled together in the end but throughout the process it was a little worrisome. We did not manage our time well. we easily got caught up in conversation but luckily us as people work extremely well together. Our group should have split up the work a little more. Nearing the end we pulled together better. While presenting we all had a good stance on what each of us had to say. One thing that is a huge plus from our group is that we always got along. We had understandings and were able to communicate it a very civilized and conscious manner. I believe our glove for our hand warmer was a key factor.
We plan to make a cost effective hand warmer to sell through our school at the cold winter sporting events with a 20 degree temperature change.
OUR PROJECT:
Our final product turned out to be two separate compartments. One side is filled with water and the other side is filled with Calcium Chloride. We decided to leave space at the top where when turned upside down and unclipped the salt and water will mix. Within 15 seconds the hand warmer should raise drastically in temperature and stay warm for around 4 minutes without the outer fabric. With the fabric it should stay warm form somewhere between 8-10 minutes.
As for the inner chemicals, we ended up using 3.5 grams of CaCl20 ml of water. we did many calculations to
If we could have done something differently, we would have change the size of the hole for the water entry. it made it somewhat challenging to transfer the water over with such a small hole. We want our design to be easy to use so people will want to spend their money on our projects.
COST:
Business source binder clips- $0.55 per dozen clips
Heat sealer- free (provided by Vogl)
Water - free
CaCl- $6.55 per 500 grams… $0.04 cents for each hand warmer
So it would take four dollars to produce 100 (in terms of calcium chloride)
Pack of 347 bags- $20
To make 100 hand warmers it would cost $28.58 (0.28 for one)
At a reasonable price we would charge $1.00, we would make a huge profit
The reusable pouch would not be included it would cost $2.00
When people come back with reusable pouch the cost of hand warmer would be cut in half as “half off refill”
REFLECTION:
I enjoyed doing this project. Although, it was hard to grasp the concept of the calculations. I felt a little as if we as a group were lost a lot of the time forcing us to rush at the end, which was our faults for not reaching out for separate help, but it ended up working out. I believe our group pulled together in the end but throughout the process it was a little worrisome. We did not manage our time well. we easily got caught up in conversation but luckily us as people work extremely well together. Our group should have split up the work a little more. Nearing the end we pulled together better. While presenting we all had a good stance on what each of us had to say. One thing that is a huge plus from our group is that we always got along. We had understandings and were able to communicate it a very civilized and conscious manner. I believe our glove for our hand warmer was a key factor.