ENERGY AUDIT OF IIT-BOMBAY CAMPUS

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1. INTRODUCTION
The Indian Institute of Technology - Bombay (IIT-B), set up by an Act of Parliament,
was established in 1958, at Powai, a northern suburb of Mumbai. Today, the Institute is
recognised as one of the centres of academic excellence in the country. Over the years, there
has been significant progress at IIT Bombay in all academic and research activities, and a
parallel improvement in facilities and infrastructure, to keep it on par with the best institutions
in the world. Institutes in positions of excellence grow with time. As on date, it has 14
Departments, 10 Centers, 3 Schools and 4 Interdisciplinary programs. The student strength of
the institute is about 5300, with faculty strength of about 450 and supporting staff of about
1500 over an area of about 500 acres.

1.1 Energy audit objective
This energy audit assumes significance due to the fact that the IIT-B electricity bill had
crossed Rs. 10 crores during 2007, and it was aimed at obtaining a detailed idea about the
various end use energy consumption activities and identifying, enumerating and evaluating the
possible energy savings opportunities. The target is to achieve savings in the electrical energy
consumption to the extent of 20%. The audit was also aimed at giving the students a feel of the
practical problems and difficulties in carrying out energy audits. As energy engineers, the
students of the department enthusiastically participated in the endeavour.

1.2 IIT present energy scenario
The energy consumption on campus is mainly in the form of electricity, apart from the
use of LPG as cooking fuel in the hostels.
The campus had a connected electrical load of 5.3 MW as on April 2008 and a contract
demand of 4.5 MVA. The monthly recorded peak demand for the year 2007 is given in Fig.
1.1. The IITB energy bill for the year 2007 was Rs. 10.2 crores. The electricity bill comprises
two parts: one related to the energy consumed (per kWh or per unit energy consumed) and the
other is the maximum demand charge (per kVA of maximum demand during the month). There
also exists a penalty for low power factor. Furthermore, the energy charge includes a
component based on time of use.


1.3 Specific Energy Consumption (SEC)
The Specific Energy Consumption (SEC) is defined as the energy consumption per unit
of product output. The specific energy consumption considering students, faculty and staff
members were calculated which forms the institute SEC and was taken as reference for
comparison. The SEC was calculated to be 1384 kWh/person/annum (for 2007) for the
academic area and Rs. 5950 per person per annum.

1.4 Segmentation
This energy audit report has segmented the energy consumption patterns both by
departments/ hostels/ offices and by end use activities (lighting, cooling, pumping, washing
etc.). The details are provided in the subsequent chapters.