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Construction Ecology | ARBE1102 | Phoi Nghi Nghiem | C3353037Assessment 4 | Decision Making Project introduction The Scenario that will be addressed is scenario A. “The developer, Simple Green Dwellings Pty Ltd, in Hobart, TAS, has had financial success redeveloping single-house properties into “environmentally-friendly” townhouses in Hobart. The developer does not really care about the eco credentials of the building products but wants your team to provide an attractive list of building materials that appear to be eco and healthy, which will add to the sales pitch for the properties. Increasingly, the “green building” sales pitch is proving successful, with some buyers more aware of greenwashing than others, but allbuyers in this market typically wanting a better outcome for the environment and their own health.”The approach in apprehending the scenario will be providing a list of materials with low carbon energy emission that are easily recycled, reused or disposal in order to align with the sustainability and green building vision that the developer promotes. EVALUATION OF THIS PROJECTThis project investigates a material selection process by evaluating three options for one building element:The interior based material selection for this project will evaluating three relatively low embodied carbon materials which being Concrete blocks (1.5 per embodied energy MJ/kg), Gypsum board/Plasterboard (4.4 per embodied energy MJ/kg) and Stainless Steel (42 per embodied energy MJ/kg). (Australian Government YourHome, n.d.) Unique requirements for project – decision-making criteriaThe unique requirements in order to select material that satisfy both the developer client’s objective and promoting sustainability for the future of the construction are climate compatibility and low-cost materials that creates low environmental impact. The selected materials are chosen based on the weathering conditions of Hobart during the entirety of the year. The climate of Hobart is quite stable compared to the rest of Australia, averaging around 15°C to16.8°C during warmer seasons such as spring and summer while averaging from 8°C to 13.7°C during colder seasons such as autumn and winter (Australian Government Bureau of Meteorology, 2020) . Due to the developer stating they ‘does not care about eco-credentials requires a material list that appears to be eco and healthy and will add to the sales pitches for the properties’, indicates that low-cost of materials and the incur cost of material transportationfee will be an imperative factor that comes into consideration. Hence, accessible local manufacturers are selected in acquiring the materials. Therefore, the low-cost and eco-friendly materials must be recyclable or reused in order to minimise possible environmental impact cause through construction.
Construction Ecology | ARBE1102 | Phoi Nghi Nghiem | C3353037Table 1 Unique location and client information for this projectLocal ClimateExisting Conditions for building siteInterpretation Influence on Material choiceTemp average/ max January21.6°CTasmania is located southern ofAustralia at the latitude locatedbetween 40 – 43 degrees south latitude, therefore the domination of western currentsthroughout the year results to aseries of disturbances that will lead the wind to the west side of the island. Hobart is located on the southeast of Tasmania and receives 570 millimeters of rain per year. Since, the climate of Hobart is classified mild temperate oceanic climate therefore seasonal mild rainy winters and cool, yet quite rainy summers are to be expected, rainfall are well distributed over seasons even during summer. The climate zone determined inHobart is classified ‘Zone 7’. Zone 7 is characterised to have Cool temperate therefore thereis low humidity, high diurnal range with four distinct seasons. The summer and winter exceed human comfort range with variable spring and autumn conditions, cold to verycold winters with majority of rainfall, hot dry summers. Due to these conditions, building designs should aim to maximisesolar gains to achieve thermal comfort (Australian Government YourHome, n.d.)The climate in Hobart is quitecool with low humidity level, thus requires a substantial amount of energy to achieve thermal comfort for humans.According to the Nationwide House Energy Rating Scheme(NatHERS Rating), the development of houses in a benign climate needs to achieve 8 or more stars level of thermal performance in order to maintain the lifecycle of carbon reductionsequivalent to other climate zones. Therefore, the material selected are required to contain appropriate thermal conductivity (Australian Government YourHome, n.d.).Av/Min July11.7°CProjected 2090 max26°CProjected 2090 min23°CWind Jan am10% – 20% of windfrom North West going at 10 – 20 km/h. Beaufort number: 3 –4Wind Jan pm10% – 20% of windNorth West going at 10 – 20 km/h.Beaufort number: 3 –4Wind July am10% – 30% of windSouth East going at20 – 30 km/hBeaufort number: 4Wind July pm10% – 20% of windfrom North West going at 10 – 20 km/h. Beaufort number: 3 –4Climate ZoneZone 7: Cool TemperatureLocal Biome typeBiome type is categorised as ‘Grassland’ and under the sub-division of ‘Savanna’ Client requirementsThe Simple Green Dwellings PtyLtd strategies ‘Green building’ as a marketing ploy to elevate their sales pitch to the more environmentally wary targeted market audience. With the understanding the prospect With the requirement of the developer to create an attractive list of ‘eco and healthy’ materials. The three materials being proposed and evaluated are: concrete blocks, gypsum board and
Construction Ecology | ARBE1102 | Phoi Nghi Nghiem | C3353037buyers are conscious of ‘Green building’ are more beneficial forthe overall health of both dwellers and the environment. Thus, the only requirement of the materials proposed to developer is the want of an ‘attractive list of building materials that appears to be eco and healthy’. However, appearing to be ‘eco and healthy’ is not adequate and low embodied materials should be proposed and promoted in order satisfy potential prospects who have done their research on sustainable eco-friendly building materials. It will illustrate the company with well-aware and educated imagethat the developer envisioned. stainless steel. All the materials chosen to be proposed to the developer has high levels of durability and sustainability therefore itreduces the impact on the environment. The construction industry accounts for 36% of the worldwide energy usage and emits 40% of Carbon Dioxide emission with fabrication andshipment of materials contributing a great image tothe carbon emission. Thus, materials should be sourced locally to reduce transportation and recyclable/reusable to reduce energy consumption and wastage. Both gypsum board (USG Boral, n.d.) and stainless steel (Stainless Steeland the Environment, 2019) are 100% recyclable whilst concrete blocks are quite sustainable (USG Boral, n.d.).Locally manufactured materials USG Boral is an international building and construction materials provider with a multitude of distributors across Australasia. Their products are very accessible with delivery service to buyers and has a wide range of different size andcolours. Therefore, choosing USG Boral for gypsum board and concrete blocks. Bluescope Steel likewise to USG is also a major company specialising in steel due the easy accessibility, delivery service and vast range of steel materials, therefore, sourcing stainless steel from a dependable company is a wise choice. USG Boral take the request for variation customisation if contacted by a Contract Administrator. For example, a standard USG Gypsum board stands at 2400mm tall and the building space that needs to be filled is 2000mm,a Contract administrator can contact the company can ask the order for it to be cut and sized down to 2000mm. This will be beneficial for both parties, as client’s required size for material achieve and USG gains a loyal customer through ease and customer service. Summary of decision-making criteria:The climate in Hobart 7 is characterised to have cool temperate and low humidity high diurnal range; therefore, cold to very cold winters with majority of rainfall, hot dry summers, exceeding the human comfortability range. Accordingto the Nationwide House Energy Rating Scheme (NatHERS Rating), the development of houses in a benign climate needs to achieve 8 or more stars level of thermal performance in order to maintain the lifecycle of carbon reductionsequivalent to other climate zones. Therefore, the material selected are required a substantial amount of thermal
Construction Ecology | ARBE1102 | Phoi Nghi Nghiem | C3353037conductivity to achieve thermal comfort for humans and home building designs should aim to maximise solar gains to achieve thermal comfort (Australian Government YourHome, n.d.) The construction industry accounts for 36% of the worldwide energy usage and emits 40% of Carbon Dioxide emission with fabrication and shipment of materials contributing a great image to the carbon emission. The proposed materials should be sourced locally to reduce transportation and recyclable/reusable to reduce energy consumption and wastage. Both gypsum board (USG Boral, n.d.) and stainless steel (Stainless Steel and the Environment, 2019) are 100% recyclable whilst concrete blocks are quite sustainable (USG Boral, n.d.). This greatly benefit the Simple Green Dwellings Pty Ltd by aligning with the company’s image and the minimising the cost of material sourcing and transportation whilst also utilising credible eco-friendly and sustainable materials. Thus, the three requirements of the materials proposed to developer are: To Align with the want of ‘attractive list of building materials that appears to be eco and healthy’. Construction materials designed to be compatible with Hobart climate zone outlined by the Australian Government. Be sustainable with low carbon embodied energy emission Additional decision-making factorsThe developer at Simple Green Dwellings Pty Ltd have create the image of being ‘Green building’ company as a marketing ploy to elevate their sales pitch to the more environmentally wary targeted market audience. Therefore, itis an imperative component, materials must be low carbon emission and eco-friendly sustainable materials that can be recyclable or reused in order to minimise possible environmental impact cause through construction. With a growing demographic of prospect buyers acknowledging the importance of ‘Green building’ are more beneficial for the overall health of both dwellers and the environment.Decision-making framework: ideal outcome reference chartTable 2 Ideal outcome reference chartThemeDecision-making factorsIdeal options (low – high)FateRecycled contentO-9%10-29%30-49%50-69%70-89%90-100%
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