# Energy Audit of Own Shelter

##### Subject

Building Services

,Climatology

,##### Academic Year

2'nd Year

,##### Complexity Level

Intermediate

,##### Content tags

Climate Justice

,Energy Consumption

,Energy Efficiency

,##### Activity Type

Survey

,##### Activity duration

1-2 hours

,##### Objective

To analyse the electricity usage of your own shelter.

##### Outcome

Students will get an idea about the most energy intensive devices in their homes, and how they can reduce energy consumption from these devices.

##### Requirements

Electrical appliances in household, monthly/bi-monthly electricity bill.

##### Prerequisites

** **A conceptual knowledge of energy consumption. Electrical energy requirement and consumption of the appliances or machines at one’s own house.

##### Procedure

** Step 1: **Identify all the electrical appliances in your home.

** Step 2: **Look for nameplates on each appliance.

** Step 3: **Note down the value of power consumption mentioned on the nameplate of each appliance.

** Step 4: **Estimate average daily operation hours of each appliance for the previous month. Multiply it by 30 or 60 (based on whether you get a monthly or bi-monthly bill) to get monthly/bi-monthly operation hours.

** Step 5: **Estimate the monthly/bi-monthly electricity consumption of each device by multiplying power consumption with operation hours.

Sample Calculation:

Calculate the cost to run the appliance

Annual/Monthly cost = Energy consumed annually/Monthly x rate of utility per kWh

Using the above formula, let us find the annual cost to operate an AC.

- Run time per day: Let us assume that it is summer and you run the AC for 7 hours a day for lets say 20 days a month.
- Wattage: You will find the wattage on the label or the user manual. Let us assume it as 1500 W.
- Energy consumed daily: (1,500 x 7) ÷ 1,000 = 10.5 kWh
- Energy consumed annually: Let us assume you run the AC for 200 days in a year.

10.5 kWh x 200 = 2,100 kWh

- Annual cost: Let us assume the utility rate is 12 rupees per kWh

2,100 x 12/kWh = 25,200 INR per year .

Considering this as a sample calculation, calculate the electricity consumption of other appliances in your household.

** Step 6:** Add the electricity consumption from all the appliances to get an estimate of monthly electricity consumption of your home.

** Step 7:** Tally this value with the electricity consumption of last month/ two months, mentioned in the electricity bill. Both values should be close.

** Step 8:** Identify the three most energy intensive appliances in your home, based on their energy consumption.

** Step 9:** Reflect on the ways in which you can decrease the energy consumption of these appliances in order to reduce your bill.

*Table*

Appliance | Power Consumption (P) (kW) | Average Daily Operation (T_{d}) (hrs) | Monthly/bi-monthly operation days (D) | Monthly/Bi-monthly Consumption (T_{m}) (hrs) = T_{d}xD | Monthly/Bi-monthly Electricity Consumption (E) (kWh) = P x T_{m} |

Tubelight 1 | |||||

Tubelight 2 | |||||

Fan 1 | |||||

Fan 2 | |||||

Bulb 1 | |||||

Bulb 2 | |||||

Refrigerator | |||||

Television | |||||

Geyser | |||||

Oven | |||||

Air Conditioner | |||||

… | |||||

Other | |||||

Total | – | – | – |

##### References

*Nameplate of an Air Conditioner*

- cBalance Database: HomeEnergyAuditRedyReckoner_india_no2co2_2011.pdf
- Wattage and Power consumption of appliances: https://letsavelectricity.com/wattage-power-consumption-of-household-appliances/