1. Introduction The energy consumed by a building depends upon many factors. Between them we can find: weather conditions (dry bulb T) where the building is located, materials that compound the building, lightning, HVAC systems and occupancy are the most important ones. The variety of factors makes that the prediction of the consumption not easy to be carried out. Universities and companies are struggling with this issue. To predict it, both universities and companies usually develop their own simulation programmes to make assumptions and to understand better the problem they face. The most typical building subject of study are residential, engineering and office ones (Zhao and Magoulès, 2012).
Focus on the buildings sector, its final energy consumption represents over one-third of the total final energy (International Energy Agency, 2013), with the consequent CO2 emissions that are incrementing the effects of Climate Change. It is stated the in Paris Climate Change Agreement (Otto, 2016) that if we continue with this pace in terms of fossil fuel consumption, emissions derived from the buildings sector could represent, by 2050, twice as they do now. Therefore, it becomes urgent to renovate existing buildings deeply in order to improve their energy efficiency.

2. Description of the model 2.1 General Description
The building subject of simulation made on ESP-r is in Chicago. It consists of two rooms, which names are reception and office, covered by a roof. It represents a typical medical practice. We mainly focus on the reception zone when undergoing the comfort research. The façade where the reception window is located is oriented southern (towards the equator). Reception has a surface area of 48 m2 (obtained by multiplying the difference on x-y cartesian coordinates provided by ESP-r) and its window 7,5 m2 (obtained by
Figure 1: Medical Practice Building
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multiplying the difference on x-z coordinates). Figure 1 provides the design of the building.

2.2 Thermophysical changes
The following changes are made to run comfort simulations: activation of the cooling system (the initial design does not include it), halve the size of the reception window, set a HVAC system and finally change the absorptivity and emissivity of the southern wall. Comfort parameters are analyzed then in comparison to the initial design provided by the database. Moreover, one more simulation is done to calculate how much energy can ten PVs export to the grid and how much is lost by the inverter.

3. Numerical experiments performed The simulations undertaken to analyze the thermal comfort on the medical practice are the following:
1. One winter simulation covering a week of February for each thermophysical change (and for the initial design too). This simulation also considers a heating system activated to provide warmth to the offices. The heating load, PMV and PPC comfort parameters and the energy delivered are calculated through this simulation. 2. One summer simulation covering an entire week of July for each thermophysical change. This simulation also considers the cooling system disactivated for the initial design. The cooling load, PMV and PPC comfort parameters and the energy delivered are calculated through this simulation. 3. Another yearly simulation is carried out in what 10 PVs panels are incorporated on to the south facing part of the roof, to get the year generation of them and the losses in the inverter. Note: this simulation has been done in a colleague laptop as my windows version could not match the materials needed to the roof.
4. Results and discussion All graphs shown in this section have been created with the ESPr results analysis tool. This document shows those that the author has considered as most important.
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Figure 2: Heating load obtained during a winter week of the initial design

Figure 3: Cooling load obtained during a summer week. Initial design does not include cooling system
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Figure 4: PMV values of the initial design, winter simulation

Figure 5: PMV values of the initial design, summer simulation
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Figure 6: PMV values, summer simulation. 5000 W of cooing system with 25ºC of set point

Figure 7: PMV values, summer simulation. Half size window and 5000 W of cooing system with 25ºC of set point
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Figure 8: PMV values, summer simulation. 1 ac/h infiltration from 9:00 to 18:00 during weekdays and 5000 W of cooling system with 25ºC of set point

Figure 2 and Figure 3 provide the heating load and cooling load through a winter and a summer respectively. On the one hand, heating load follows a sharply tendency which 1kW pics match with the working hours. The total heating delivered value is 46 kWh. On the other hand, it is understandable that if there is no cooling system activated, the
Figure 9: Generation of 10 PVs and Transsmission to the grid, year simulation
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cooling load is zero. PMV winter and summer values (Figures 4,5) indicates a bad comfort according to ASHRAE. Without cooling system, PMV reception in summer achieves a value of 5, extremely hot. For this reason, changes are required. First of them is shown in Figure 6. Applying 5000 W of cooling system with a set point of 25ºC reduce PMV value in the reception in summer from 5 to an average of 2,5. However, the extremely unpleasant pics still appear. The energy delivered for cooling in this case is 140 kWh. Halving the window size eliminates the sharp peaks of PMV summer values. Values fluctuate between 1 and 3 but any sudden increase or decrease appears. This is mainly because less solar radiation enters during daylight hours. However, the cooling capacity applied seems to be not enough to maintain a good degree of comfort even though the window is reduced. The energy delivered for cooling in this particular study is 110 kWh. A further study with a lower set point and that size of the window would probably get better results. Figure 8 shows the case of applying an infiltration rate of 3 AC/h for the reception during working hours from Monday to Friday. Again, the PMV value got for summer in not acceptable, averaging a value of 2,3 approximately for the reception. Probably the best results would have been obtained by merging the three changes just explained. Another study has been carried out by changing the absorptivity to 0,9 and the emissivity to 0,1 of the reception south wall. It can be deduced that increasing absorptivity produce more substantial effects than decreasing the emissivity because a value of 144,5 kWh has been obtained for the energy delivered for cooling in summer. Lately, ten PV panels have been installed on the south facing part of the roof. The average generation value is approximately of 1 kW while the transmission to the grid is 700 W; so, 300 W are lost in the inverter.
Therefore, advanced improvements are required to improve the comfort of this medical practice. Going to the literature, (Balaras, 1996) investigates the role of thermal mass for reducing cooling demand while (Venkiteswaran, Liman and Alkaff, 2017) studies the cases of wall insulation by polystyrene, single low-emissivity window glazing and white painted roof for reducing cooling demand and improving thermal comfort.

5. Conclusions 1. Without cooling system, it is not possible to stay in the reception due to the extremely hot situation. 2. A 5000 W cooling capacity with an entering set point of 25ºC improves the comfort but it is still unpleasant. Reducing the set point temperature would improve the comfort but it would increase the cooling load.
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3. Smaller windows reduce the cooling requirement in summer. 4. Increased absorptivity makes more difficult the heat to escape. 5. Losses in inverter in form of heat are directly related to their quality and price. It is preferable spend more money initially in a good inverter than having big losses each day.

IndiGo, headquartered in Gurugram is India’s largest passenger airline with a market share of 39.7% as of January, 2018. It was set up in early 2006 by Rahul Bhatia of InterGlobe Enterprises and Rakesh Gangwal, a United States based NRI.InterGlobe holds 51.12% stake in IndiGo and 48% is held by Gangwal’s company Caelum Investments.

They primarily operate in India’s domestic air travel market as a low-cost carrier with focus on their three pillars – offering low fares, being on-time and delivering a courteous and hassle-free experience. IndiGo has become synonymous with being on-time.
Since their inception in August 2006, they have grown from a carrier with one plane to a fleet of 156 aircraft today. A uniform fleet for each type of operation, high operational reliability and an award-winning service makes them one of the most reliable airlines in the world. They currently operate flights connecting 50 destinations – 42 domestic and 8 international.
1.1 TIMELINE
2013-14: IndiGo was the second fastest growing lost-cost carrier in Asia after the Indonesian Airline – Lion Air. However, IndiGo had already announced that it plans on seeking permission from the ministry to acquire four more aircraft, therefore actually taking the delivery of nine aircraft in 2013. In August 2013, the Centre for Asia Pacific Aviation ranked IndiGo among the top 10 low-cost carriers in the world.

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2015-16: IndiGo placed an order of 250 Airbus A320 Neo Aircraft worth \$27 billion, making it the largest single order ever placed in the history of Airbus. Indigo announced an initial public offering of Rs. 3200 crores on October 19, 2015 which opened on October 27, 2015. According to the submission to DGCA, IndiGo with a 33.8% share of domestic passenger traffic in the year ended March 31 reported a net margin of 9.4%

2016-17: Indigo awarded for outstanding performance and profitability by CAPA India, Mumbai. IndiGoReach has been recognised amongst the top 100 most impactful CSR program by the World CSR Congress, Mumbai. It was recognized as ‘Great Place to Work for in India’ for 8 years in a row (2008- 2016)

2017-18: IndiGo celebrated its 11th anniversary with special fares. Indigo was ranked the second-Best Budget Airline by SmartTravelAsia.com. It was named as Aon’s Best Employer for the year 2016 and 2017.
IndiGo announced the appointment of Rajagopalan Raghavan as the senior Vice-President and Wolfgang Prock-Schauer as the Chief Operating Officer.

1.2 MISSION STATEMENT

“IndiGo is a very quality conscious airline and passenger safety is paramount to our company’s mission and values”

1.3 MARKET SHARE

Source: http://www.livemint.com/Companies/RHi9FvENDxO1re0jQ6bN3L/Indias-air-traffic-doubles-to-117-million-passengers-in-6-y.html

The Director-General and CEO of International Air Transport Association (IATA) – Tony Tyler, had stated that the global world is focussing on Indian aviation, starting from manufacturers, airlines, businessmen, tourism boards, global businesses to individual shippers and travellers. According to Mr. Tyler, a bright future can be expected if there is a common goal among all stakeholders in India’s aviation sector.

2.1 Market Size
India’s domestic air traffic nearly doubled to 117 million passengers in 2017 with 100 flights taking off every hour compared to 67 in 2011, as per the data released by aviation regulator Directorate General of Civil Aviation. India’s airlines flew 117.18 million passengers in 2017 compared to 59.87 million in 2011. They also noticed that there was an 18% growth over the 99.88 million passengers who flew in 2016.
India is the 9th largest civil aviation market in the world, In FY17, domestic passenger traffic witnessed a growth rate of 21.5 per cent. In FY17, airports in India witnessed a domestic passenger traffic of about 100 million people. Investments worth US\$ 6 billion are expected in the country’s airport sector in 5 years. India’s civil aviation market is set to become the world’s 3rd largest by 2020 and expected to be the largest by 2030.
As of December 2017, the existing fleet of aircraft stands at 548 aircraft in India, and another 920 aircrafts are expected to be inducted into the fleet by 2025.
Some major changes:

• Domestic passenger traffic expanded at a CAGR of 11.46 per cent over FY06–17
• According to Directorate General of Civil Aviation, domestic passenger traffic witnessed growth at a rate of 22 per cent, in comparison 21.24 per cent in FY16.
• International passenger traffic registered growth at a CAGR of 8.33 per cent over FY06-17.
• During February 2017, domestic airlines carried over 8.23 million passengers, showing a growth of more than 23 per cent compared to the same period last year.
• During FY17, domestic passenger traffic increased by 22 per cent in comparison with growth rate of 21.24 per cent in FY16.During FY16, international passenger traffic increased by 7.72 per cent.
Notes: FY – Indian Financial Year (April – March), CAGR – Compound Annual Growth Rate

2.2 Factors Contributing to the Growth of Aviation Sector

From an under-managed and over-regulated sector, the aviation industry in India has now changed to a more open, liberal and investment friendly sector. The civil aviation sector in India has moved into a new era of expansion. Some key factors contributing to this are:
• Increased tourist inflow
• Modern airports
• Supporting government policies
• Higher household incomes
• Entry of low cost carriers (LCC)
• Cutting edge information technology (IT) interventions
• Strong economic growth
• Increased FDI inflows in domestic airlines
• Surging cargo movement
• Focus on regional connectivity

2.3 Some Major Threats to the Airline Industry
There are many threats faced by the aviation industry. The global economy creates a great impact on travelling for leisure and business. A downturn in the global economy means that less people are likely to travel for pleasure and to do business. This leads to fall in income of the airline during this period. To minimize this effect, the organization should devise a mechanism of reducing its operation cost to the minimum level possible to prevent losses due to its operating costs exceeding income.
Some government legislations can also be a major threat to the investors in aviation industry. Government interventions can come with some rules which are very costly to adhere to.
Air travel is very vulnerable to changes in the environment. Heavy storms affect flight schedules, and this means refunding those customers who opt to cancel their flights instead of waiting. It can also lead to loss of the asset, for example, crashing of an aircraft. To minimize the effect of this loss, the airline should make sure that it is well insured against losses resulting from these changes in the weather. There should also be an insurance cover for the passengers of the airline.
Air travel has a seasonal demand especially where a large percentage of travellers involves the ones travelling for leisure. In this case, the highest demand is likely to arise during international holidays like the Christmas season and a significant decrease in demand would be faced in the middle of the year. To ensure that there is no significant drop in customers during the off-peak seasons, the organization can come up with methods to encourage people and motivate them to travel during this period by lowering the travel rates, offering discounts and some special travelling packages.
In recent times, air travel has been a target to terrorists, and this has had a very negative impact on the airlines themselves. Frequent travellers have been scared, and the airline industry has lost a number of customers. To gain back the confidence that they’ve lost, an organization should carry out an extensive campaign solely meant to assure customers of their safety when travelling using their airline.
With the increasing number of airlines and aircrafts, it is highly likely that the shortage of airports and airport facilities will come up. The airline should therefore, invest in its own airports and ensure that they have enough parking bays for its aircrafts.
The organization also face the threat of being attacked by its major competitors. It should therefore, passively work on counteracting these so that it does not fall prey to the accusations made by other airlines.
The greatest hurdle faced by many airlines today is high fuel prices. A huge upward surge in fuel prices can destabilize an investment in the aviation industry. To counter this, the airline should ensure that it has its own fuel reserves so as to reduce the affect caused by the changes in fuel prices as it will have time to adjust while relying on its fuel reserves.

India’s aviation industry is largely untapped with huge opportunities for growth, taking in consideration that air transport is still expensive for majority of the country’s population, of which nearly 40 per cent is the upwardly middle class.
The industry stakeholders should engage and collaborate with policy makers to implement efficient and rational decisions that would boost India’s civil aviation industry. With the right policies and undivided focus on quality, cost and interest of passengers, India would be well placed to achieve its vision of becoming the third-largest aviation market by 2020.
In the coming 20 years, Indian companies will buy 2,100 new planes worth US\$ 290 billion. Also, domestic air traffic in India is expected to cross 150 million in FY19, on the back of unprecedented capacity induction by airlines*.
Exchange Rate Used: INR 1 = US\$ 0.0155 as of January 4, 2018.
Note: *According to Centre for Asia Pacific Aviation (CAPA)

3. EXTERNAL ANALYSIS

3.1 Porter’s Five Forces

3.1.1 Bargaining Power of Suppliers
Any airlines generally face a duopoly of two main suppliers – Airbus and Boeing. There are other suppliers like Bombardier, Dauphin, Embraer, Dronier, Tupoloev but they do not meet the requirements to serve the lost cost commercial aircraft carriers, particularly IndiGo airlines. Thus, there are a few suppliers and thus are in a better position to bargain because they always find customers for their aircrafts.

Buyers in airline industry are highly fragmented and very large in number thus lowering their power. With the economy growing at a faster pace and increasing low cost carriers, the buyers have increased and with that have increased the opportunities for growth. The switching cost is almost negligible as there are multiple alternatives available. It is not really difficult for a customer to move from one airline to another or switch to some other provider.

3.1.3 Threat of New Entrants
Product Differentiation: When we take low cost carriers in account, we observe that there is not much of a difference in services provided to the customers. Differentiation can only be achieved by Value Added Services. IndiGo provides stair free ramps, ‘Q-busters’ and check-in-kiosks. Hence, this works in favour of IndiGo.
Switching Cost: The switching cost is not really high. Customers can easily pick other low-cost carriers over IndiGo. The switching cost of an airline to other business or industry is high as the exit cost is high.

3.1.4 Availability of Substitutes
The main substitute for the low-cost carrier is the railways. But this substitute is not as powerful as the airline because of the following reasons:
• Customers prefer airlines over railways because it is convenient and it saves time. So, it cannot act as a substitute for the customers who value time.
• Many customers use airlines as a status symbol. So, for prestige, trains cannot act as a substitute.
• So, if we just consider IndiGo airlines, other low-cost carriers like SpiceJet and Go Air are the direct substitutes. In this case, the threat of substitutes is high as the cost of switching between other low-cost carriers is very low.

3.1.5 Competitive Rivalry
The aviation industry is a highly competitive industry which makes it difficult to earn high returns in this sector. The main reasons for high competition in the low-cost carrier airlines are stated below:
• Very less scope for differentiating competitor’s product and services
• There is very little scope for growth in the aviation industry. The only way to grow is by stealing away competitor’s customers.
• Supplier’s bargaining power is high as the supplier of aircrafts are the same – Airbus and Boeing.
• There is no brand loyalty because the switching cost for customers is almost negligible. So, the customers can easily choose the competitor’s aircraft over ours.
• Closest competitor of IndiGo is SpiceJet followed by Go Air.

3.2 PEST ANALYSIS

4. INTERNAL ANALYSIS
Under internal analysis we’ve considered two main categories:
(i) VRIO Analysis
(ii) SWOT Analysis

4.1 VRIO Analysis

VRIO is the acronym from the first letters of the areas – Value, Rareness, Imitability and Organisation. So, the first thing that comes to the mind is whether the resource is available. It is considered valuable if it can increase the market share, net profit etc. Once a resource is identified as valuable, the next thing that comes up is to identify whether it is rare or it’s available to all competitors. If the resource is valuable but not rare, it means that the competitors possess the same resources, the company has no specific advantage in this resource. The resource should also be difficult for the competitors to imitate or acquire. This is called Imitability, which can act as a competitive advantage if the company knows how to benefit from it. Organisation is where the resources are supported by the provisions in the company and that they are used properly. Otherwise, the resource is of no use.
Therefore, the resource that is valuable, rare, costly to imitate or acquire and the company is organised to capture the value of the resource, it can be a source of competitive advantage for an organisation.

The VRIO analysis for IndiGo Airlines is as follows:

Valuable: IndiGo has increased its market share and created value by offering the lowest fairs to its passengers. They use a single type of aircraft which means the cost of maintenance of the aircraft is low, which in turn favours them in creating the value. Also, they follow the practice of hedging the fuel, which results in lowering down the overall cost of the fuel.

Rarity: IndiGo has the highest market share in the industry and all of this is due to the low-priced tickets it offers to the travellers. The single type of aircraft and low average age of the fleet is a rarity in the Indian Airline Industry.

Imitability: Even though IndiGo has created value amongst its customers and the market but its strategies like using a single type of aircraft and less turnaround time are imitable and hence are not sustainable in the long run.

Organisation: In the last few years, IndiGo has become a big brand name in the Indian Aviation Industry. It has been around 10 years since its institution and it has created value through its unique proposition.