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ENG1002 Design project - Client Brief Version 1.0

Client Brief Version 1.0 1. Project Outline Alpine Trekking Pty Ltd seeks submissions from suitably qualified companies for the fundamental design for a trekker’s hut and an electrical heating system, to be built at a specific site on a walking track in the Australian Alps. Figure 1 shows the basic layout for the design. The basic design is a wooden A-frame supporting a steel roof (shown in black) with two side walls within the A-frame, one gable end has a door and a window and the other (not shown in Figure 1) has a window only. (The placement of the windows and door is flexible.) The walls and internal ceiling of the hut are made from plywood (shown in green).

Figure 1: Proposed hut design

1.1 The purpose of the hut

The floor plan of the hut (within length L and width W) must be designed to:

 accommodate a minimum of 12 adult trekkers sleeping on double bunks

 provide sufficient floor area for storage of equipment (not between bunks)

 provide sufficient floor area for cooking

 provide sufficient floor area for movement

(For full details see parts 3 and 4 of this document)

The hut is to be heated by two electric-oil heaters, powered by a micro-hydro generator run by a nearby stream.

Detailed design requirements are specified in the following pages, including the design parameters (by name), the design goals, design constraints and the types of equipment that can be selected for the design.

Students please note – read the IMPORTANT NOTES on the last page of this document and note the comments regarding the completion of individual assignments in italics.

Side View (North face) End View (East face) Elevation

L W

1.2 m x 0.6 m

1.8 m

bunks inside

1.8 m

walls 1.2 m

0.3 m

0.7 m

0.8 m

door

window

Window, bunks and door placement is flexible. Window and bunk orientation is flexible.

0.8 m

Roof angle theta to horizontal

between 30̊ and 60̊

headroom

Colour bonded roofing sheet

Arrangement of bunks is only to show their size and headroom space

2 ENG1002 – Introduction to Engineering and Spatial Science Applications

2. Project Design Sections This project has been divided into five design sections, to ensure that the requirements of the project are clear. Each section of the design is to be defined by the set of design parameters, listed in bold. Your analysis must use these variables names (letters) to identify the parameters. Each design section requires a technical analysis be completed to determine the range of possible solutions available.

Technical details for the materials is provided in part 4 of this document.

The Design Sections are:

1. The dimensions of the hut and a diagram showing the proposed floor plan and designated areas. (only this section is to be used for the Technical Analysis Report)

The design parameters for this section are:

 W - the width of the hut (in m)  B - the base of the roof of the hut (in m)  H - the height of the hut (in m)  θ (theta) - the roof angle (in degrees)  A - the floor area inside the hut (in m2)

2. The quantity of plywood required for the walls and the rate of heat loss through the walls,

windows and door. (this section may be used for the Presentation)

The design parameters for this section are:

 AW - the surface area of plywood required for the walls of the hut (in m2) (with the area for the windows and door subtracted)

 QW – the rate of heat loss through the walls, two windows and door of the hut (in W)

In the presentation students must clearly show a link to Design Section 1 AND

must also suggest how this heat loss could be reduced.

3. The quantity of plywood required for the ceiling (internal), the quantity of colour bonded steel sheeting for the roof and the rate of heat loss through the ceiling and roof material (or this section may be used for the Presentation)

The design parameters for this section are:

 AC - the surface area of plywood required for the ceiling of the hut (in m2)

 AR - the surface area of roofing material required for the hut (in m2)

 QC – the rate of heat loss through the ply ceiling / roof sheet combination (in W)

In the presentation students must clearly show a link to Design Section 1 AND must also suggest how this heat loss could be reduced.

4. The electrical heating system, insulation and micro-hydro generator (this section is only to be used for the Design Proposal) Details for this section will be provided in Version 2 of the Client Brief.

5. The budget and costs of the components of the system (this section is only to be used for the Design Proposal)

Details for this section will be provided in Version 2 of the Client Brief.

ENG1002 Design project - Client Brief Version 1.0

3. Design Specifications

3.1 Design Goals The design goals for the project are to:

G1. Maximise the number of trekkers that can be accommodated in the hut

G2. Minimise the construction cost of the hut and electrical heating system

G3. Stay within the allocated budget

G4. Minimise the power required to maintain the desired internal temperature of the hut

Additional goals may be advised in Version 2 of the Client Brief.

3.2 Design Requirements The following requirements must be met:

R1. Accommodate a minimum of 12 adults sleeping on double bunks (1.8 m x 0.8 m)

R2. Provide a minimum floor area of 3 m2 for storage of equipment (not between bunks)

R3. Provide a minimum floor area of 2 m2 for cooking (above which the chimney must be placed)

R4. Provide a minimum floor area of 12 m2 for movement (which also includes the space between bunks and space to open the 0.8 m wide door)

R5. Provide a minimum space of width 0.8 m on one side of each bunk for access into the bunk

R6. Provide a minimum head room of 0.8 m above the edge of the top bunk (or above the centre point along the length of the bunk)

Additional requirements may be advised in Version 2 of the Client Brief.

3.3 Design Constraints The following constraints apply:

C1. A maximum budget is yet to be advised

C2. The maximum height (H) for the hut is not to exceed 4m.

C3. The roof angle (theta) must be between 30 and 60 degrees (to horizontal).

C4. The side wall height must be 1.2 m. Additional constraints may be advised in Version 2 of the Client Brief.

3.4 Scope The wooden frame which forms the primary structure of the A frame roof is not part of this design.

The technical analysis and design work required for this project requires the specification of values for the parameters listed for each design section and the selection of components only from those provided in this Client Brief. All components or materials not specified in versions of this brief are outside the scope of the design and should not be considered.

4 ENG1002 – Introduction to Engineering and Spatial Science Applications 3.5 Simplifying Assumptions

The following simplifying assumptions are to be made:

A1. The wooden frame which forms the primary structure of the A frame roof is to be ignored.

A2. The thickness of the wooden frame, walls and roof material is ignored when considering the dimensions of the hut.

A3. The corners and joins between wall and roof surfaces are to be ignored when calculating the quantity of materials required and the heat losses.

A4. The door is made from two pieces of plywood glued together to form a single 36mm thick door.

A5. The construction of the floor is not to be considered and there is no loss of heat into the floor.

Additional assumptions may be advised in Version 2 of the Client Brief.

4.0 Technical Information

Additional technical and cost information required for the other design sections and the costs of components will be provided in Version 2 of the Client Brief.

Table 1. Material Specifications

Quantity variable value unit Plywood thickness Lp 18.0 mm thermal conductivity kp 0.115 W/(m*K) Steel Roofing thickness Ls 0.7 mm

thermal conductivity ks 65.0 W/(m*K) Window Glass thickness Lg 8.0 mm thermal conductivity kg 1.4 W/(m*K) dimensions 1.2 x 0.6 m Door (plywood) thickness Ld 36.0 mm dimensions 1.8 x 0.8 m

Table 2. Environmental Conditions

Quantity variable value unit Altitude of the hut site Alt 1750.0 m (above sea level) Air density ρ (rho) (see Moaveni) kg/m3 specific heat value c 1007.0 J/(kg*K) Minimum external temperature TL -10.0 C Desired internal temperature TD 20.0 C

See next page for important notes to students.

ENG1002 Design project - Client Brief Version 1.0

Important note to students The sections listed above are to be used to subdivide the analysis and design process and identify the sections you are to use for your Technical Analysis Report, Presentation and Design Proposal, as detailed in the requirements of the TAP and DP assessments.

IMPORTANT: This is a closed design problem where all information required to complete the technical analysis, calculations and evaluation of possible solutions will be available in the Client Brief, your text books or other provided assignment material. The problem presented is a simplified version of a real design problem, so the more complex aspects and fine details of the components of the proposed system are ignored.

If you find yourself seeking information beyond that provided in the Client Brief, your text books or other assignment material then you are probably over thinking the problem. The three assessments using this problem are able to be completed using just the engineering fundamentals you are studying, supported by other course material and tools like the spreadsheet. There is no need to research commercial equipment.

For the Technical Analysis Report all students must complete a technical analysis and prepare a short technical report on design section 1 (only) of the project.

For the Presentation each student will select design section 2 or 3 of the project on which to complete a technical analysis and prepare a short oral presentation. You are to present a summarised technical analysis of that section of the design and how it links to section 1 of the design. The presentation is to be prepared and delivered as if to other colleagues in your company who are working with you on the larger project.

For the Design Proposal assessment students are expected to complete the technical analysis for the whole project, model the design on a spreadsheet, evaluate some alternatives within the design and select a specific design solution to recommend in their report. The recommendation must clearly specify all of the parameters listed in the design sections in bold, as they define each section of the design.

Students should note there is more than one correct answer to this problem, as several possible solutions will meet the requirements of the design.

Furthermore - a technical analysis of a single design section ALONE is unlikely to identify a set of design parameters that results in the final project design, as the sections are somewhat dependent on each other. Hence when you complete a technical analysis on a single section of the design you are not looking for a specific ‘answer’ to that section.

The staged release of a Version 1 and a Version 2 of the Client Brief is intended to discourage students from trying to ‘solve’ the whole problem at once, because some students try to present a single ‘best case’ as the outcome of an analysis of a single section,

which suits their one ‘answer’.

Your analysis should show the relationships between the parameters within that section and possibly with those in other sections of the design. This analysis will allow you to eliminate some of the alternative equipment suggested (when it is evident it cannot do the job), or you may be able to reduce the range of values for some parameters which offer a possible solution.