Intro

Marwall LunchPod

FUSE Industrial Design

Introduction

The LunchPod is a leakproof, stainless steel, twin walled, vacuum-seal insulated lunch box with custom utensils, BPA-free Tritan double lid, and carabiner loop latches
The collapsible silicone shuttle is made from LFGB certified food-grade silicone and is microwave, dishwasher, and oven safe
Client wanted a non-plastic reusable food container to replace single-use food containers

Research Goal

Define a new market niche consisting of:

A sealable metal container capable of holding soup
Minimizes heat loss over a 4 hour time period
Appeal to the 25-40 year demographic

Form Discovery with Foam Models

Research

Heat Simulation to inform insulation design

Conduction Heat Equation

q = UA (T1-T2)

q = Heat transfer (W)
A = Heat transfer area (m2)
U = Coefficient of Heat Transfer (W/(m2° C))
T1 = Temperature Front side of Material (°C)
T2 = Temperature Back side of Material (°C)

Convection Heat Equation

q = hcA (Ts- Ta)

q = Heat transferred per unit time (W)
A = Heat transfer area of the surface (m2)
hc= Convective heat transfer coefficient (W/(m2° C))
Ts = Temperature surface
Ta= Temperature air

PROCESS

1. CFD analysis first run with defined liquid and gas volumes to calculate coefficient of convection (h). Liquid in silicone container started at 185F. Simulation ran for 4 hours with periodic temperature samples obtained

2. Heat simulation run with respective conduction & convection properties applied to surfaces