# European Journal of Sustainable Development Research

Ecological Footprint Assessment and Reduction of an Academic Building in Shahdol (India)
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1 Motilal Nehru National Institute of Technology Allahabad, Teliarganj, 221004 Allahabad, INDIA
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Research Article

European Journal of Sustainable Development Research, 2018 - Volume 2 Issue 4, Article No: 42
https://doi.org/10.20897/ejosdr/3910

Published Online: 04 Oct 2018

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ABSTRACT
Buildings are responsible for significant natural resource consumption, waste generation, and environmental pollution. Building impacts are generally assessed through life cycle analysis (LCA). This study integrates LCA with the Ecological Footprint indicator for the assessment of a building's impact on the planet. In order to determine ecological impact of a building, a methodology has been established for estimation of Life Cycle Ecological Footprint (LCEFtotal) of the building, as well as to assess its impact due to resource consumption (energy, water, building materials, manpower etc.) and waste assimilation over the lifecycle. For an academic building located in India taken as a case study, the LCEFtotal is found to be 4397.03 gha and the LCEFtotal per unit floor area is 0.60 gha/m2. The average annual Ecological Footprint (EFavg) of the academic building is 73.28 gha/yr that is approximately 20 times more than the actual physical land of the campus. The average annual Ecological Footprint per student (EFavg/student) of the academic building is 0.045 gha/yr/student. If annual grid electricity consumption of the building is replaced by the grid-connected rooftop photovoltaic (GRSPV) system in the ratios of 100%, 75%, 50% and 25%, it can reduce up to 61%, 54%, 31%, and 15% of the total LCEFtotal of the academic building, respectively.
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# INTRODUCTION

The building sector is responsible for about 32% of the total energy consumption and 19% of energy related CO2 emissions globally (IPCC, 2014). Approximately 50% of the total energy is consumed for maintaining thermal comfort (heating/cooling) inside the built envelope during the operational phase of the building. The construction sector in India has been growing at the average annual rate of 10% over the last decade. The housing stock in India has increased at a remarkable rate, from 250 million units in the year 2001 to 330 million units in the year 2011 (ORG and CC, 2011). In India, energy demand for material manufacturing is nearly 20-25% of the total energy demand while annual building material consumption is exceeding 2 billion tonnes. Simultaneously GHG emissions by construction sector are contributing up to 30% of the total GHG emissions of the country (Mani et al., 2012).

For environmental protection regulation, waste assimilation is another challenging task after the GHG emissions. The annual waste generated in India is about 62 million tonnes while 25% of the total waste is contributed by construction and demolition (C&D) waste. C&D waste requires approximately 1240 hectare land per year. If the same growth rate in waste generation is maintained, it will reach 165 million tonnes by 2031, requiring as much as 66 thousand hectares of useful land for waste disposal in the next 20 years (considering 10 m high waste pile) [PCR, 2014]. Various studies acknowledged that majority of waste generated during the time of demolition phase of building can be recycled up to 25-40% and the rest is disposed of in landfill (TIFAC, 2017). Therefore, reuse or recycling of the C&D waste can help in saving energy, materials, and the environment.

LCA is a well-known technique for evaluation of ecological impact quantitatively. Varun et al. investigated that the life cycle energy and GHG emissions for a three storey institutional building are 6.67 GJ/m2 and 0.45 tCO2eq/m2, respectively (Varun et al., 2012). Ramesh et al. conducted a review of the life cycle energy (LCE) analysis of buildings (both residential & commercial) and suggest that operational phase (80-90%) contribute a significant role in total building’s energy demand (Ramesh et al., 2010). Ramesh et al. (2012) reported that the LCE of residential buildings is around of 240 - 380 kWh/m2/year, and the operational phase of the building consumes 80-90% of LCE in India. Pinky et al. (2014) investigated that building operational phase contributed 62-77% and construction phase contributed 22-36% of the total life cycle energy depending upon the building life. Azzouz et al. (2017) investigated that operational carbon and energy consumption of a building are 6.8 and 10.5 times higher than their embodied carbon and energy, respectively. During building maintenance, energy consumption and emissions are negligible as well as difficult to estimate, therefore ignore its value for building life cycle analysis (Ramesh et al., 2012; Zhang et al., 2016). LCA of building typically did not include impacts due to manpower/labour involved. Cole. (1998) found that labour transportation could account for 10–80% of total construction energy. The studies reported did not estimate the impact of resources like water consumption, manpower, waste assimilation, and built land etc. on the environment. These resources have significant impact on our earth and should not be neglected.

Ecological Footprint (EF): In the last three decades, various tools (such as Ecological Footprint (EF), life cycle energy and carbon assessment etc.) have been developed to estimate the sustainability of a system. The Ecological Footprint has emerged as one of the world’s leading measures of human demand on nature. The EF concept was created in mid-nineties by Mathis Wackernagel and William Rees (Wackernagel and Rees, 1996). It can be used to examine various measures such as the feasibility of resource consumption, distribution of the world’s natural resources, waste assimilation and overall sustainability of a system.

The Ecological Footprint of an activity is expressed in terms of global hectare (gha), which is defined, as “One global hectare is equivalent to one hectare of bio-productive land with world average productivity”. The expression for evaluating EF (in gha) is as follows:

 Ecological Footprint (EF) = ∑ (Ci / Yi).ei (1)

where, Ci is annual consumption of item i (kg/yr), Yi is annual productivity of item i (kg/ha), Carbon sequestration due to human activities (such as fossil fuel burning, emission during material production, transportation etc.) can be expressed as follows:

 EF of carbon sequestration = Pc {(1-Soc)/Yc}.ei (2)

where, PC is annual CO2 emissions, Soc is the fraction of annual oceanic anthropogenic CO2 sequestration and YC is the annual rate of carbon uptake/hectare of forestland at world average yield (GFN, 2010).

Conway et al. calculated the EF of the operational phase of the University of Toronto at Mississauga (UTM) based on energy, waste, and water, along with food and transportation. They found that energy contributed more than half the share in the EF of UTM (Conway et al., 2008). Solis Guzman et al. (2013) developed the methodology to find the EF for the construction phase of residential buildings in Spain and found that the EF of the built envelope was 0.384 gha/year per m2 floor area. Martínez Rocamora et al. (2017) found annual EF of an institutional building as 94.77 gha/yr with 92.7% share of carbon absorption. Gottlieb et al. (2012) calculated annual EF of a school as 314 gha that was 160 times larger than their physical or built-up land. Teng and Wu (2014) evaluated the eco-footprint and eco-efficiency in each phase of the life cycle of an institute building, but taking many assumptions such as building construction & demolition time, demolition energy factors etc. For building environmental impact assessment, it is necessary to perform a complete inventory analysis of resource and energy consumption, waste assimilation, recycling and the process of construction, and demolition.

This paper focuses on the ecological impact of a typical academic building in India. This study is significant, as huge enhancement in infrastructure will be needed in near future to improve current education scenario in India. According to GFN (2017a), the total Ecological Footprint and per capita Ecological Footprint of India are 1.36 billion gha and 1.1 gha/person, respectively; while biocapacity deficit of the country is 0.7 gha/person. Indian resource demands have already surpassed the available bio-capacity of the country. This study is a step in the overall estimation of natural resource demand of the Indian education sector. Such a study may also be helpful in exploring the possibilities of reducing EF of the education sector of the country.

# METHODOLOGY

## Life Cycle Ecological Footprint of a Building Project (LCEFtotal)

In this paper, the EF indicator has been integrated with the LCA approach for assessment of the impact of a building project on the biosphere that determines the LCEFtotal of a building based on natural resource consumption, GHG emissions, and waste assimilation etc. LCA of building project is defined as to investigate and measure the ecological consequences during their life, from the extraction of raw materials, material production, construction phase, use & maintenance phase, materials & C&D waste transportation, and demolition phase. LCA system boundary of a building project based on cradle-to-grave approach is depicted in Figure 1.

It begins with the implementation of a building project and progresses with the construction, operation, maintenance, and ends with building demolition. The lifecycle of a building associated with resource consumption (fuel, electricity, material, water etc.), transportation, manpower, land use and waste generation, and its disposal or recycling. All above parameters convert into the equivalent productive land needed to produce or absorb their impacts in the form of CO2 absorption land, forestland, cropland, and built-up land. LCEFtotal contains all phases of building’s life: implementation & construction phase, operation & maintenance phase and demolition phase. The principle of evaluating the LCEFtotal of a building is shown in Figure 2. It is used to effectively examine the impact of building project on the earth and calculated with Eq. (3):

 LCEFtotal = LCEFe&m + LCEFw + LCEFt + LCEFwe + LCEFm + LCEFbuilt-up (3)

where, LCEFe&m, LCEFw, LCEFt, LCEFwe, LCEFm and LCEFbuilt-up represent the life cycle ecological footprint of energy and material consumption, water consumption, transportation, waste generation, manpower, and built-up land consumption of the building, respectively.

### Life Cycle Ecological Footprint of Energy and Materials Consumption (LCEFe&m)

The LCEFe&m of a building is estimated by summing up the energy & materials expenditure for each phase of the building life. The building’s LCEFe&m is calculated using following relations:

 $\text{LCEF}_{e\& m} = \left\{ L_{\text{CO}_{2}}\text{. }\left( \left( 1 - S_{\text{oc}} \right)/Af \right) \right\}.e_{\text{CO}_{2}\text{land}} + \left\{ \sum_{}^{}\frac{C_{\text{wi}}}{Y_{\text{wi}}}\ \right\}\text{.e}_{\text{forest}}$ (4)

where; $$L_{\text{CO}_{2}}$$ is total life cycle emission of a building, the total life cycle emission during the lifespan of a building due to direct energy used and embodied material energy (neglecting material and energy consumption during building maintenance) is calculated using following relations:

 $L_{CO2} = M_{CO2} + \sum_{}^{}\left( E_{c}.\lambda_{i} \right) + \left( E_{o}.L_{b} \right).\lambda_{\text{electricity}} + \sum_{}^{}\left( E_{d}.\lambda_{i} \right)$ (5)

where; $$M_{CO2}$$ = Embodied CO2 emission of building materials; $$E_{c}$$ = direct energy consumption in construction work (i.e. machinery used); $$E_{o}$$ = Annual operational electricity consumption of building; $$E_{d}$$ = direct energy consumption in demolition work (i.e. machinery used); $$L_{b}$$ = Building operation time (60 years); $$\lambda_{i}$$ corresponding emission factor of ith fuel and $$\lambda_{\text{electricity}}$$ is 0.82 tCO2/MWh emission conversion factor of electricity generation in India (MPCEA, 2016).

Scripps Institution of Oceanography estimated that 30% of global carbon di oxide (CO2) emissions from all emission sources in the earth over the period of 2002–2011 were absorbed by the oceans (SIO, 2017). Therefore, fraction of anthropogenic emissions sequestered by oceans (Soc) is 0.30. The world average forest carbon sequestration (AFCS) rate is estimated to be 0.73±0.37 tC.ha­­-1 (Mancini et al., 2016). If converted AFCS data in to world average forest CO2 sequestration that is 2.68± 1.36 tCO2.ha­­-1 (Af absorption factor of forests is considered to be 2.68 tCO2/ha). Cwi life cycle consumption of ith wooden material (t or m3); Ywi, is yield of wood production in India (73 m3/ha (FSI. 2015)), $$e_{\text{forest land}}$$ & $$e_{\text{CO}_{2}\text{ land}}$$ are equivalence factor of forestland (1.28gha/ha) and CO2 absorption land (1.28 gha/ha), respectively (GFN, 2017b).

### Life Cycle Ecological Footprint of Transportation (LCEFt)

The LCEFt consists of three stages (a) raw material transportation from factory to construction site, (b) manpower transportation from their houses to project site, (c) C&D waste disposal from the site to land fill area. Energy and resource consumed, and CO2 emitted by transportation during implementation are very low and nearly 1.1% of the construction of the building (Jiang, 2011; Li, 2012). To estimate the LCEFt of the building, neglect material and waste transportation during building maintenance.

Few assumptions are taken to determine the LCEFt, which is given below:

1. The average distance from the factory to the construction site for materials is the range of 20-30 km.

2. The average distance travelled by labours to reach the construction site is the range of 10-15 km.

3. All materials and C&D wastes (neglect maintenance waste) transported through HDT.

4. All workers travel by public transport systems (i.e. 86.12% of total passenger kilometres travelled by public transport in India that was estimated by (Reddy and Balachandra, 2010)) mainly buses.

The Life cycle EF of transportation is calculated with Eq. (6):

 $\text{LCEF}_{t} = \left\{ \left( \sum_{}^{}\frac{C_{\text{mi}}.D_{\text{mi}}}{T_{c}} + \sum_{}^{}\frac{C_{\text{wj}}.D_{\text{wj}}}{T_{c}} \right).E_{\text{truck}} + \sum_{}^{}\frac{M_{k}.D_{\text{mk}}}{T_{b}}.E_{\text{bus}} \right\}.\lambda_{\text{diesel}}.\left( \frac{1 - S_{\text{oc}}}{\text{Af}} \right).e_{\text{CO}_{2}\text{land}}$ (6)

where, $$C_{mi}$$ and $$D_{mi}$$ are weight of transportable of $$i$$th material and average distance of transportation of $$i$$th material, respectively; $$C_{wj}$$ and $$D_{wj}$$ are waste and average distance of transportation of $$j$$th material, respectively; $$M_{k}$$ and $$D_{\text{mk}}$$ are number of labour and average distance travelled by the labour. $$T_{c}$$ and $$T_{b}$$ represent the capacity of truck (3.5 ton) and bus (50 passenger), respectively; and $$\lambda_{\text{diesel}}$$ emission factor of diesel fuel (3.17 CO2 kg/kg of diesel (EEA, 2013)). The average fuel efficiency of HDT ($$E_{\text{truck}}$$) and Bus ($$E_{\text{bus}}$$) are 0.222 and 0.238 kg of fuel/km, respectively (Baidya and Borken-Kleefeld, 2009).

### Life Cycle Ecological Footprint of Manpower (LCEFm)

The LCEFtotal associated with manpower impact is studied by focusing mostly on the food and mobility. The impact of manpower's mobility has already been considered in Section 2.1.2, therefore, only food consumption taking into account to assess the LCEFm. Moreover, it could be assumed that food provides the energy needed to do the work. To determine the LCEFm, food consumption taken by labourers during working hours is considered for impact on the environment of a building [34].

The food consumption should be assessed by considering all types of food such as vegetable and animal-based products separately. According to National sample survey office (NSSO, 2014) “Household Consumption of Various Goods and Services in India 20ll-12”, Ministry of Statistics and Programme Implementation, Government of India, June 2014 report. Due to lack of data of daily distribution of nutrients in the standard Indian diet, we assume that during work-hour (8 hrs) nearly 60% (175 kcal/hr (Fitness blender, 2018) of the daily metabolic calories burned (2400 kcal/day (NIN, 2011)) by a construction labour. The total number of hours worked during construction & demolition is obtained from the Central Public Works Department (CPWD, 2014).The LCEFm is determined by Eq. (7).

 $\text{LCEF}_{m} = \frac{d_{w}}{365}.f_{d}\left\{ \sum_{}^{}\left( \frac{C_{f_{i}}}{Y_{f_{i}}} \right).e_{i} + \sum_{}^{}\left( C_{\text{fuel}_{j}}.\lambda_{j} \right).\frac{\left( 1 - S_{\text{oc}} \right)}{A_{f}}.e_{\text{CO}_{2}\text{land}} \right\}$ (7)

where, $$d_{w}$$ is total number of labour-days worked during building life; $$f_{d}$$ is daily food intake fraction of an Indian adult (60%), $$C_{f_{i}}$$ is food consumption category $$j$$ during building life (kg/person/yr); $$Y_{f_{i}}$$ is food production yield of ith (kg/ha/yr). $$C_{\text{fuel}_{j}}$$ is fuel consumption category $$j$$ during building life (kg/person/yr), $$\lambda_{j}$$ is emission factor of category $$j$$ fuel.

According to goods consumption in India (i.e. urban & rural areas) (NSSO, 2014), annual EF of food consumption per capita in India is depicted in Appendix A. Bio-productive lands fraction involved in annual EF of food consumption (area wise) depicted in Appendix B.

### Life Cycle Ecological Footprint of Waste Disposal (LCEFwe):

The building's waste generally results in transportation and landfill disposal of the materials while transportation is considered in transportation section. However, some waste material can be recycled that may reduce environmental impact. According to TERI, (2004), waste generation during building construction phase is 40 kg/m2 to 60 kg/m2, waste generation during building maintenance is range between 40 kg/m2 to 50 kg/m2. The highest share of waste generation during building life comes from the demolition phase. Demolition of pucca and semi-pucca buildings, on average generates between 300kg/m2 and 500 kg/m2 of waste, respectively (TERI, 2004). Recovery rates vary from 25% in old buildings to as high as 75% in new buildings (WMW, 2017).

According to TERI (2004), volume of waste material generated during building demolition per floor area of Masonry and Concrete & mortar is 0.3825 m3 and 0.5253 m3, respectively. The volume of waste materials is converted to mass in ton by material density (Masonry: 1600 kg/m3, Concrete and mortar 1920 kg/m3). For estimation of the Life cycle EF of waste disposal, the average height of waste dump is 10 feet (3.3 m) considered and assumed the life of the C&D waste is about 75 years. The life cycle EF of waste is determined through Eq. (8).

 $\text{LCE}F_{\text{we}} = \sum_{}^{}\frac{W_{dw_{i}}}{Y_{dw_{i}}}.e_{\text{landfill}}$ (8)

where, $$Y_{dw_{i}}$$ {(i.e. waste deposit capacity in one hectare bio-productive land)/(decomposition time of waste)} represents the yield of C&D waste disposal (m3/ha); $$W_{dw_{i}}$$ represents the amount of waste (m3), and $$e_{\text{landfill}}$$ (0.43 gha/ha pasture land (GFN, 2017b)); represents the equivalence factor of the type of bio productive land for the waste to be disposed (gha/ha).

This study is focused only on waste generation during construction and demolition phases of a building. However, waste generated during maintenance phase is not considered in the analysis because of lack of data in Indian construction sector as well as negligible impact on the building lifecycle analysis. All C&D waste disposed to the landfill, however, recycling and reuse of waste materials are not considered.

### Life Cycle Ecological Footprint of Water Consumption (LCEFw):

The water consumption during the life cycle of a building largely remains undocumented in India. Water consumption mainly results in construction and operation phase while demolition phase does not consider it because of very less amount of water need. Bardhan (2011) analysed that water demand in material production, as well as construction phase, is about 27 Kilolitres/ m2 of the total built-up area for typical urban constructions in India. Water consumption in building maintenance & demolition is essential but due to lack of data, we neglected water consumption in these building phases. Ground water is generally used in building construction in India, therefore CO2 absorption land needed to compensate the electrical energy that is used for uplifting water from underground to certain height. The LCEFw is determined through Eq. (9).

 $\text{LCE}F_{w} = C_{w}.E_{w}.\lambda_{i}.\frac{\left( 1 - S_{\text{oc}} \right)}{A_{f}}.e_{CO_{2}\text{land}}$ (9)

where, $$C_{w}$$ is total water consumption during all phase of building life (m3); $$E_{w}$$ is the rate of energy consumption per litre to water extraction from ground; $$\lambda_{i}$$ is emission factor of $$i$$th fuel (such as diesel, electricity etc.) that use to extract water.

### Life Cycle Ecological Footprint of Built-up Land (LCEFbuilt-up):

Building is involved with various bio-productive land categories: (1) CO2 land (2) forestland (3) cropland (4) pasture land & (5) sea land etc. However, the direct physical land use for construction is discuss in this section. The LCEFbuilt-up is calculated by:

 $\text{LCEF}_{built - up} = A_{b}.e_{built - up\ land}$ (10)

where, LCEFbuilt-up is the ecological footprint of direct land occupation (gha), $$A_{b}$$ is the total built-up land (ha) and $$e_{built - up\ land}$$ is the equivalence factor of built-up land (2.52 gha/ha(GFN, 2017b)).

# CASE STUDY

## Building Description

Life cycle ecological footprint of an academic building has calculated as a way to measure progress towards a broad goal of increasing the sustainability of education system. In this study, LCEFtotal of the Government Polytechnic College, Shahdol campus building located in Madhya Pradesh, India. The campus building images are depicted in Figure 3(a, b). This institute is one of the campuses associated with the Rajiv Gandhi Prodoyogiki Vishwavidyalaya state university, Madhya Pradesh, India.

Area of campus is around 3.5 hectare, with college buildings (5857 m2 floor area), hostels (1462 m2 floor area), playground, and parking lots etc. In the academic year of 2015-2016, the institute was open for 236 days with scheduling of 9:00 am to 4:00 pm, there were 1440 full-time students and 40 office members (faculty & staff) while approximately, 400 students lived in hostels. Electricity consumption data of academic buildings are taken from electricity bill paid (60821 kWh for six months) by college admiration.

## Average Annual Ecological Footprint of an Academic Building

For calculation of average annual ecological footprint (EFavg) of an academic building (the Government polytechnic college Shahdol), some assumption have been taken in to account: one year duration for building construction phase, 60 years duration of building operation phase, and one year duration of demolition and waste disposal phase. The Average annual ecological footprint (EFavg) of the building is calculated by given formula:

 $\text{EF}_{\text{avg}} = \frac{Life\ cycle\ ecological\ footprint\ of\ a\ building\ (\text{LCEF}_{\text{total}})}{\text{Building life span}}$ (11)

The Average annual ecological footprint per floor area (EFavg/floor area) of an academic building are given below:

 $\text{EF}_{avg/floor\ area} = \ \frac{\text{Life cycle Ecological Footprint of a building}}{\ Building\ life\ span \times floor\ area\ of\ the\ building}$ (12)

The Average annual ecological footprint per student (EFavg/student) of an academic building are given below:

 $\text{EF}_{avg/student} = \frac{\text{Life cycle Ecological Footprint of a building}}{Building\ life\ span \times No\ of\ student\ in\ one\ academic\ year}$ (13)

# RESULTS & DISCUSSONS

## Life Cycle Ecological Footprint of the Building (LCEFtotal)

In order to determine the LCEFtotal, all parameters (LCEFe&m, LCEFw, LCEFm, LCEFwe, & LCEFbuilt-up land) are evaluated individually and then added to calculate total LCEF of the building. The detailed information about all parameters is shown in the Table 3 and percentage of different type of bio-productive land involved during the life cycle of the academic building is shown in Figure 5. The LCEFtotal of the academic building by using Eq. 3-10 is 4397.03 gha, and its maximum fraction is CO2 absorption land, which is about 99% of the total land impact. The LCEFtotal per floor area is 0.6 gha/m2.

Table 1. Material consumption in the academic building

 Materials Unit Consumption Emission factor kg­CO2/kg EF(gha-yr) Burnt Clay Brick (1.84 kg each) no 1867320 0.162-0.195 101 Cement kg 1613350 0.61-0.74 103 Fine & Coarse sand kg 2612770 - - Aggregates kg 257880 0.0048 1.96 Steel kg 1923500 1.74 973.3 Wood (Teak India) m3 17.03 - 0.294 Glass (common) m3 0.784 0.86 0.0015 Ceramic tile m3 12.19 0.74 0.032 Marble stone m3 1.8 0.116 0.0000065 PVC pipe ton 1.45 2.56 0.94 Paint ton 0.7 0.36Kg CO2/m2 0.064

### Life Cycle Ecological Footprint of Energy and Materials Consumption (LCEFe&m)

The LCEFe&m of the building is estimated by summing up the EF of construction materials used, EF of construction energy, EF of building operational energy, and EF of demolition energy consumed during building life span. Due to lack of data and for simplicity, maintenance and materials recycling/reused impact are not considered in this section. Construction energy is calculated by using the data of machinery used for the construction site. Construction materials consumption and their EF have been obtained by using the data on Table 1 and it is calculated by using the Government of India report [CPWD, 2014]. Annual operational energy (electrical energy) is calculated by IES-VE® building simulation software because only 6-month electricity bills were available for the study. Table 2 data used for calculation of energy consumed during building construction.

Table 2. Machinery used, Fuel consumption & Emission factor

 Type of Input energy Capacity Input energy Input energy rate λ ( kg of CO2 /unit) Total consumption Total consumption Heavy duty truck 3.5 ton Diesel 0.240 kg/km 3.17 CO2 kg/kg diesel 15024.22 kg of diesel Bus 50 passengers Diesel 0.238 kg/km 3.17 CO2 kg/kg diesel 986.75 kg of diesel Concrete mixer 5 hp Diesel 1.6 l/hr 3.17 CO2 kg/kg diesel 161 kg of diesel Electrical vibrator 1 hp Electricity 0.745 kWh/hr 0.82 tCO2/MWh 75.1 kWh Water pump 1 hp Electricity 0.745 kWh/hr 0.82 tCO2/MWh 14164 kWh

Table 3. The LCEFtotal of the academic building

 Land type CO2 absorption Forest land Crop land Pasture land Sea-productive land Built-up Total (gha-yr) LCEFe&m 4339.56 0.30 4339.86 LCEFw 9.66 9.66 LCEFm 1.51 0.03 10.34 2.12 0.82 14.82 LCEFwe 15.45 15.45 LCEFt 8.75 8.75 LCEFbuilt-up 8.49 8.49 Total LCEF 4359.48 0.33 10.34 17.57 0.82 8.49 Grand LCEFtotal 4397.03

The result of simulation for monthly electricity consumption of building is shown in Figure 4. The monthly consumption value of simulation results have a maximum deviation of 9% with actual data for the month of August and total average deviation is around of 6%, which is within acceptable limits. Therefore, we assume that the annual operation energy consumption obtained by simulation is in accordance with the actual energy consumption. The IES-VE simulation result shows that the total annual electricity consumption of the institutional building is (118.1 MWh) 16.14 kWh/m2 for the year of 2016. Due to lack of embodied CO2 emissions data of building material for India, it is calculated using the emission data from Inventory of Carbon & Energy (ICE, 2011), Sustainable Energy Research Team (SERT) report.

The LCEFe&m of the building calculated according to Section 2.1.1 is 4339.86 gha. The contribution of Ecological Footprint of the building’s operational energy is approximately two third of the total LCEFe&m, while second highest contributor is materials embodied energy of the building.

### Life Cycle Ecological Footprint of Transportation (LCEFt)

The location of a construction site is a major factor for the transportation of materials, workers, and

C&D waste during the life cycle of a building. This regional specificity should be a clear consideration of any building LCA, particularly focused in the construction and demolition phases. Fuel consumption during all type of transportation and their emission factors are shown in Table 2. The LCEFt of the building calculated according to Section 2.1.2 is 8.75 gha.

### Life Cycle Ecological Footprint of Manpower (LCEFm)

The LCEFm was assessed through food consumption by the labourers during the working hours. The total number of labour-days is about 16458 during the life of the building, it is calculated by CPWD, Government of India 2014 report. The monthly goods consumption per person in urban India is obtained, by using the NSSO, (2014) report. The LCEFm of the building calculated according to Section 2.1.3 is 14.82 gha. This result indicates that for food consumption of Indian labourers, cropland dominantly contributes (typically more than 2/3 of the total land) to the LCEFm of the building.

### Life Cycle Ecological Footprint of Waste Disposal (LCEFwe):

The generation of C&D waste during building life are determined through using real data of built-up area and building type, the amount of C&D waste is about 1581 m3 ( approximately 2561.6 ton). The LCEFwe of the building calculated according to Section 2.1.4 is 15.45 gha.

### Life Cycle Ecological Footprint of Water Consumption (LCEFw)

For LCEFw estimation, CO2 absorption land was taken in to account. The water is mostly consumed during the construction phase of the building and it is calculated using data of building per floor area basis (Bardhan, 2011), the result of water consumption during construction is 197613 m3 of water. Due to lack of data and very low consumption, we are neglecting water consumption in demolition phase and maintenance phase of the building. The LCEFw of the building calculated by Eq. 7 is 9.66 gha.

### Life Cycle Ecological Footprint of Built-up Land (LCEFbuilt-up)

The total land expended must be considered that are used for academic building and hostels building blocks (i.e. total campus area). The LCEFbuilt-up of the building calculated by using Eq. (8) is 8.49 gha.

## Average Annual Ecological Footprint (EFavg) of the Building:

The EFavg of the academic building by using Eq. 9 is 73.28 gha/yr. The EFavg of the building required nearly 20 times more than the actual land (3.5 ha) of the institute campus.

## Average Annual Ecological Footprint per Unit Floor Area (EFavg/floor area) of the Building:

Eq. (10) is used to calculate the average annual ecological footprint of the academic building with respect to construction area (7319 m2) of the campus, which is 0.01 gha/yr/m2.

## Average Annual Ecological Footprint per Student (EFavg/student) of the Building:

Eq. (11) is used to calculate the EFavg/student of the academic building, which was 0.045 gha/yr/student for the academic year of 2016.

## LCEF Reduction

Various research studies on LCA of different types of solar photovoltaic (SPV) module systems suggest its potential to reduce environmental impact (Prakash and Bansal, 1995; Wild-Scholten, 2009; Keoleian and Lewis, 1997; Ito et al., 2008; Baharwani et al., 2014; Pacca et al., 2007; Cucchiella et al., 2015). Generally, mono crystalline SPV modules are used as rooftop SPV systems in India because its efficiency is high as compared to other types of SPV modules. Embodied energy of mono crystalline Silicon (mono-Si) SPV module is in the range of 2860 – 3860 MJ/m2 (Wild-Scholten, 2009; Jungbluth et al., 2010; Laleman, 2011). Embodied energy of inverter (per kWP capacity) is around 503 MJ/m2 and that of installation (per m2 solar module) is about 34 MJ/m2 (Pacca et al., 2007). RETScreen® software was used for estimation of grid-connected rooftop solar photovoltaic (GRSPV) system capacity (20 years lifespan) to fulfil the annual electricity requirement of the building.

The potential reduction of the LCEFtotal of the academic building due to the installation of GRSPV systems is depicted in Figure 6. If grid-electricity consumption is replaced by 100%, 75%, 50%, and 25% through the GRSPV system, it can reduce up to 61%, 54%, 31%, and 15% of the LCEFtotal of the building, respectively. GRSPV system has reduction potential of LCEFtotal of the academic building in range of 1698-1728 gha, if annual grid-electricity is completely replaced by GRSPV system i.e. the case of net zero energy building.

# CONCLUSIONS

This case study assesses the ecological impact of an institutional building in India during its life span. It is intended to support building sustainability by conveying a practical method to assess life cycle ecological footprint as a sustainability indicator. By investigating the LCEFtotal of a building using the component approach, the building can compared and differentiated based on their Ecological Footprint.

The LCEFtotal of the academic building clearly indicates that the CO2 absorption land (99% of the LCEFtotal) is the most significant land in all consumed land types of the building. With this assessment, the effects of energy and materials consumption during the building life is highly significant and have the largest share in the LCEFtotal (i.e. around 98%) of the building. For this type of activity, transportation, water, manpower, and waste assimilation carry very low decisive impacts as shown through this study.

From the awareness perception, the LCEFtotal of the building result is presented as a single unit of land area. Therefore, any amateur person who has little knowledge about environment sustainability can easily understand it. The EFavg of the academic building is 73.28 gha/yr, and it required nearly 20 times more than the actual land of the campus. Martínez-Rocamora et al. (2017) also reported annual operational EF (including use, cleaning, maintenance) is about 94.772 gha/yr of a Hernando Colón Hall of Residence building. From Figure 6, maximum possible reduction in LCEFtotal of the academic building is about 61% during building lifespan, if annual grid-electricity is completely replaced by GRSPV system.

The results obtained from such a study may be helpful in proposing and evaluating strategies for reduction in Ecological Footprint of institutional buildings. For example, in the domain of energy and materials, an institutional building might have to adopt green building technologies (e.g., solar cooling/heating systems, lime calcined clay cement (LC3), insulation etc.) for significantly reducing the CO2 absorption land and thereby reducing the life cycle ecological footprint of the building.

# APPENDIX A

Table 1A. Main household goods consumption per capita in India

 Goods items Monthly rural consumption (kg) (NSSO, 2014) Monthly urban consumption (kg) (NSSO, 2014) Annual Urban EF (gha) Annual Rural EF ( gha ) Cereals 11.22 9.28 0.117123 0.141608 Vegetable 7.8 8.4 0.15748 0.146232 Pulses 0.783 0.901 0.03926 0.034118 Oil 0.674 0.853 0.06824 0.05392 Beef (meat) 0.042 0.064 0.01032 0.006773 Goat (meat) 0.049 0.079 0.005662 0.003512 Fish (meat) 0.266 0.252 0.03024 0.03192 Fruits 0.372 0.645 0.00000158 0.000000912 Milk 4.5 5.54 0.062416 0.050699 Wood (material) 19.04 4.3 0.001206 0.005342 Wood ( fuel) 19.04 4.3 0.026713 0.118282 LPG 0.38 1.9 0.025059 0.005012 Kerosene 0.53 (litre) 0.4 (litre) 0.00411 0.005445 Total annual EF 0.65490 0.602862

# APPENDIX B

REFERENCES
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