9. Sustainability Calculations

9.1 Embodied Energy Calculation:

Consumables	Length(m)	Width(m)	Thickness(m)	Volume(m^3)	Weight(kg)	Qty	Volume(m3)	Weight(kg)	MJ/m3	MJ/kg	Total Embodied Energy (MJ)
Acrylic Sheet	0.2	0.2	0.005	0.0002	0.24	1	0.0002	0.24		117	28.08
Acrylic Sheet	0.25	0.25	0.006	0.000375	0.45	1	0.000375	0.45		117	52.65
Acrylic Sheet	0.2	0.2	0.004	0.00016	0.192	1	0.00016	0.192		117	22.464
Acrylic Sheet	0.028	0.028	0.006	0.000004704	0.0056448	1	4.704E-06	0.0056448		117	0.6604416
Foam Sheet	0.3	0.3	0.01	0.0009	0.0558	1	0.0009	0.0558		85	4.743
Nut			0.008		0.0045	3		0.0135		153	2.0655
Nut			0.002		0.0007	2		0.0014		153	0.2142
Nut			0.004		0.0015	4		0.006		153	0.918
Bolt	0.075	0.008	0.008	0.0000048	0.03744	1	0.0000048	0.03744		153	5.72832
Bolt	0.01	0.002	0.002	0.00000004	0.000312	2	0.00000008	0.000624		153	0.095472
Bolt	0.045	0.004	0.004	0.00000072	0.005616	4	0.00000288	0.022464		153	3.436992
											121.0559256

9.2 Reduction in embodied energy

We can use Fibre glass as an alternative for Acrylic sheet to reduce the embodied energy. The embodied energy of Acrylic sheet is 117 MJ/kg, whereas that of Fibreglass is 28 MJ/kg.

Therefore total reduction in Embodied energy would be:

Consumables	Length(m)	Width(m)	Thickness(m)	Volume(m^3)	Weight(kg)	Qty	Volume(m3)	Weight(kg)	MJ/m3	MJ/kg	Total Embodied Energy (MJ)
Fibreglass	0.2	0.2	0.005	0.0002	0.24	1	0.0002	0.24		28	6.72
Fibreglass	0.25	0.25	0.006	0.000375	0.45	1	0.000375	0.45		28	12.6
Fibreglass	0.2	0.2	0.004	0.00016	0.192	1	0.00016	0.192		28	5.376
Fibreglass	0.028	0.028	0.006	0.000004704	0.0056448	1	4.704E-06	0.0056448		28	0.15804

Therefore, the total reduction in embodied energy is 103.854 - 24.854 = 79 MJ.