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====Adjustable Oxygen Intake Door====
====Adjustable Oxygen Intake Door====
A wooden door was drilled with holes with sliding plank to allow varying levels of oxygen into the oven for different fire strengths.
A wooden door was drilled with holes with sliding plank to allow varying levels of oxygen into the oven for different fire strengths.
[[Image:OvenFinalDesign.jpg|center|]]
[[Image:OvenFinalDesign.jpg|center|Ovenly Inferno Complete]]
==Materials/Costs==
==Materials/Costs==
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Revision as of 06:24, 7 December 2012

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Abstract

The purpose of this project is to create a low embedded energy, natural, beautiful way to cook pizza. The project will be a collaborative effort including Laurel Tree Charter School, its students, Humboldt State University, our team, and the community to demonstrate the ability to apply sustainable practices by designing products for use in daily life.

Background

The Cobb Goblins were commissioned in the Fall of 2012 as a part of Engineering 215 to design and construct an earthen pizza oven for Laurel Tree Charter School. Laurel Tree's mission is to create a sustainable model of education which provides all students with accessible curriculum, based on college preparatory standards, while developing life and socials skills in a mixed age setting.

Problem Statement and Criteria

The objective of our design is to create a sustainable, beautiful, safe, long-lasting, and functional outdoor oven for baking and cooking. The oven will be used weekly for children's pizza lunches and for the occasional fundraiser. The table below shows the criteria created by our team and Laurel Tree. These criteria were weighted to help choose a design that fit the client's needs effectively. The table below shows the criteria created by our team and Laurel Tree. These criteria were weighted to help choose a design that fit the client's needs effectively.

Criteria Importance
Safety 10
Construction Time 10
Effectiveness 9
Durability 8
Usability 7
Sustainability 7
Aesthetics 6
Student Involvement 6
Cost 5

Description of Final Project

Figure 1: CAD Drawing of Oven Layers
Figure 1: CAD Drawing of Oven Layers

Oven Layers

Inner Thermal Layer

This layer retains heat from firing and radiates it back into the oven chamber. The mixture recipe for this layer is 1 part clay, 1 part sand.

Insulation Layer

This wooly looking layer insulates the inner layer and keeps heat from dissipating into the environment. The mixture recipe for this layer is 1 part clay, 1 part sand, and 5 parts straw.

Outer Cobb Layer

The straw in the outer cobb layer provides the tensile strength need to make the oven sturdy. This layer is also useful for applying designs to the oven's exterior. The mixture of this layer is 3 parts clay, 3 parts sand, and 1 part straw.

Lime Plaster

Lime plaster is applied after the inner layers have fully dried. This layer protects the oven from the environment.

Addition Features

Counter Top

A laminate counter top was mounted to the side of the oven and held up by wood beams.

Wood Storage

The counter top provides space below for wood storage.

Chimney

A half inch thick cardboard tube was covered with thermal and cobb layers and used as an anterior chimney to the oven.

Adjustable Oxygen Intake Door

A wooden door was drilled with holes with sliding plank to allow varying levels of oxygen into the oven for different fire strengths.

Ovenly Inferno Complete
Ovenly Inferno Complete

Materials/Costs

Quantity Material Cost ($) Total ($)
27 Firebricks 1.95 52.65
4 Mortar (60 lb. bags) 8.50 34.00
7 Masonry Sand (100 lb. bags) 11.00 77.00
3 Tarps 10.00 30.00
1 Straw (bale) 9.00 9.00
1 Work Gloves (box) 9.99 9.99
1 Trowel 3.50 3.50
1 Plywood (4'x8') Donated 0.00
1 Mallet Donated 0.00
80 Red Bricks Donated 0.00
1 Ton of Urbanite Donated 0.00
40 Glass Bottles Donated 0.00
2 Wooden Beams (4"x10"x36") Donated 0.00
1 Countertop Donated 0.00
1 Riversand (cubic yd.) Donated 0.00
1 Roll Ducttape Donated 0.00
1 4' Level Donated 0.00
Assorted Hardware Donated 0.00
1 Wheelbarrow Borrowed 0.00
1 Soil screen Borrowed 0.00
2 Shovels Borrowed 0.00
1 Wheelbarrow Borrowed 0.00
Truckloads Clay soil Gathered from source 0.00
Total Cost $216.14

Results

Ovenly Inferno is successful in producing enough pizza for the whole school during lunch time. It requires 1 ft^3 of wood to fire it in 2 hours. The oven's peak temperature is ___*F and after cooking __ pizza's the temperature is ____*F. The counter space provides adequate preparation space and the fuel is kept close in the wood storage.

Video

D.I.Y

File:Newell_brickfooter.jpg
How To Build An Earthen Oven

Maintenance

The oven will need to undergo a lime wash every five years. This wash will heal the lime plaster of any cracks that may develop. The oven should be fired

Discussion and Next Steps

Cobb Goblins


References

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