Energy Audit Introduction


A modern society is a mini-city and consumes a significant amount of power. It also operates on multiple sources - most common being electricity board supply and the back-up power such as DG power. Many societies also have back up power in terms of Roof Top solar. Many of the societies have installed good amount of meters and many of the societies have installed dual energy source meters. Accounting for the consumptions, calculating common area consumption and accounting for the losses is very important for these societies.


Invariably, the task turns out to be very challenging. Quite a few societies do use excel spread sheets to calculate the common area consumption and losses. It however gets done as one time exercise and the data does not remain available to large sections of the residents.


There are two parts of the energy audit process:


(A) Grounds Up - The ground up process considers the electrical consumption points / devices, average running duration and device rating to estimate the consumption. It however give a rough number as actual operations could be very different from the theoretical basis. It however is a good exercise to give an order of magnitude number.


(B) Top Down - Top down is an industrial approach which considers the electrical distribution hierarchy and calculates the sum of child meter vs parent meter consumption. Wherever the parent meter reading does not exist, the sum of child meter consumption is taken as good approximation of the parent consumption. Such a process provides a good accounting at each network node level and allows tracking of the losses at the same frequency at which the measurements are being done.


An analysis of the common area consumption and losses is important to utilize the full value of such an exercise. Some of the losses can be attributed to minor distribution losses or metering losses. If the losses are beyond certain threshold, it is an indication that the losses or common area consumption is a serious business.




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