Energy Audit Study Circle
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Energy today has become a key factor in deciding the product cost at
micro level as well as in dictating the inflation and the debt burden at
the macro level. Energy cost is a significant factor in economic
activity. On per with factors of production like capital, land and
labor. The imperatives of an energy shortage situation calls for energy
conservation measure, which essentially mean using less energy for the
same level of activity. Energy Audit attempts to balance the total
energy inputs with its use and serves to identify all the energy streams
in the systems and quantifies energy usage’s according to its discrete
function. Energy Audit helps in energy cost optimization, pollution
control, safety aspects and suggests the methods to improve the
operating & maintenance practices of the system. It is instrumental in
coping with the situation of variation in energy cost availability,
reliability of energy supply, decision on appropriate energy mix,
decision on using improved energy conservation equipment’s.
instrumentation’s and technology.
Objectives of Energy
The Energy Audit provides the vital information base
for overall energy conservation program covering essentially energy
utilization analysis and evaluation of energy conservation measures. It
1. Identifying the quality and cost of
various energy inputs.
2. Assessing present pattern of energy
consumption in different cost centers of operations.
3. Relating energy inputs and production
4. Identifying potential areas of
thermal and electrical energy economy.
5. Highlighting wastage’s in major
6. Fixing of energy saving potential
targets for individual cost centers.
7 Implementation of measures for energy
conservation & realization of savings.
Board guidelines indicating the methodology for such
an energy audit is given below. Possible stages for
interaction/conference are also indicated
1. Collections of data on operational
parameters, energy consumption both normal and electrical, coal and
power quality etc., through a questionnaire.
2. Study the existing plant capacities and
their performance to assess plant operations.
3. Study of the specific energy consumption
(both thermal and electrical) department-wise and plant as a whole.
4. Study of the power sources, distribution
system and drive controls, load factor and efficiency of large motors,
process automations, plant illuminations etc.
5. Collection of requisite data and analysis
and identification of specific areas with potential for conservation
of thermal and electrical energy.
6. Field measurements of operational
parameters and carrying out heat and mass balance.
7. Study of limitations, if any, in the
optimal use of thermal and electrical energy.
8. Discussion with specific recommendations
along with broad system concept for conservation of thermal and
9. Preparation of capital cost estimates and
establishing techno-economic feasibility for recommended measures.
10. No investment and/or marginal investment
by doing system improvements and optimization of operations.
11. Major investment due to incorporation of
modern energy intensive equipment and upgradation of existing
12. Formulating tentative time schedule for
implementation of the recommendation.
Undertaking broad cost benefit analysis
in terms of savings in energy consumption per unit of production and
Follow-up with the industry on periodic basis to
ascertain the level of implementation of recommendation and assist, if
require, in implementation of the measures to achieve energy user
The Preliminary Energy Audit focuses on the major
energy suppliers and demands usually accounting for approximately 70% of
total energy. It is essentially a preliminary data gathering and
analysis effort. It uses only available data and is completed with
limited diagnostic instruments. The PEA is conducted in a very short
time frame i.e. 1-3 days during which the energy auditor relies on his
experience together with all the relevant written, oral visual
information that can lead to a quick diagnosis of the plant energy
situation. The PEA focuses on the identification of obvious sources of
energy wastage's. The typical out put of a PEA is a set of
recommendations and immediate low cost action that can be taken up by
the department head.
The detailed audit goes beyond quantitative estimates
of costs and savings. It includes engineering recommendations and
well-defined project, giving due priorities. Approximately 95% of all
energy is accounted for during the detailed audit. The detailed energy
audit is conducted after the preliminary energy audit. Sophisticated
instrumentation including flow meter, flue gas analyzer and scanner are
use of compute energy efficiency.