The Pizza Pouch Project Joonshick Hwang Brian Pickup Winter 2007 ME 340 Final Project.

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Presentation transcript:

The Pizza Pouch Project Joonshick Hwang Brian Pickup Winter 2007 ME 340 Final Project

Objective Analyze how an insulated delivery pizza pouch maintains proper pizza temperature Determine the difference in old method delivery to new Create equation to estimate the time it took for the delivery boy to get to your door

Analytical Procedure Set up system using approximate transient analysis Assume convective coefficients and approximate 3M Thinsulate material properties Test F o number Graph results Approximate Analysis

Experimental Set Up Get pizzas and delivery pouch from Pizza Hut Obtain thermocouples, temperature meter, and calipers Record temperatures inside the boxes and inside the pizza pouch at 10 minute intervals Graph experiment results Eat the pizzas

Assumptions Transient state (not steady state) Convective coefficients are estimates Temperature distribution of walls is closely related to temperature distribution of air inside Free convection Constant ambient temperature (taken as an average)

Material Properties Cardboard3M Thinsulate Bi =.2Bi =.6 TOO BIG for lumped capacitance

Results

Discussion Delivery pouch maintained high temperature much better than the pizza box Approximate transient analysis accurate in simulating heat loss of pizza Analysis for pouch gave higher values than experiment because the pouch had openings Convective coefficients vary due to –Movement of the pizza boxes –Environmental factors Number of pizza boxes and size of delivery pouch change temperature distribution

How long has it been? *Time is given in minutes

Conclusion Fo >.2, ok! Approximate transient analysis could be used to estimate the time of delivery of pizza Always use the insulating pouch to keep the pizza hot 30 minutes is the most you want to wait for your pizza, even with the pouch

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