Star rating of home appliances

Albi Thomas VarkeyB.Tech EEE

M G University

Terminology

White goods > Home appliances(refrigerator,a/c etc)

Brown goods > Portable appliances (television and wireless sets, microwave ovens, coffee makers) BEE > Bureau of Energy Efficiency

EER > Energy Efficiency Ratio

BTU > British Thermal Unit

Energy Efficiency

• “energy service per unit of energy consumption”

WHAT IS STAR LABELING?• An “energy efficiency rating scheme for

Electrical appliances”

Facts about Star Rating

• Upgrades the standards every two years• Energy efficiency rating norms would be

revised after every two years • Energy efficiency rating norms would be

revised from 2014 turning a five-star refrigerator into a three-star one from January.

How stars are given to appliances?

• It is the average amount of electricity used by the equipment in a year ie kWh/year under standard test conditions.

List of BEE Star Labelled Products

1  Frost Free Refrigerator  

2  Fluorescent Tube Lamps 

Upto 40W

3 Air Conditioners 

 

4 Direct Cool Refrigerators 

 

5 Distribution Transformers 

 

6 General Purpose Industrial 

 

7 Monoset Pumps 

Upto 20 HP

7a Open Well Pumpsets 

Upto 20 HP

7b Submersible Pumpsets 

Upto 20 HP

8 Ceiling Fans 

 

9 Domestic Gas Stoves 

 

10 Stationary Storage Type 

 

11 Colour Television 

 

12 Washing Machine  

Examples

Transformer Star Rating

• A transformer rated 16 KVA, losses at 50% loading is 200 Watts, then it has got 1 and same if 100% loading makes 555 Watts loss.

• A transformer rated 16 KVA, losses at 50% loading is 120 Watts, then it has got 5 and same if 100% loading makes 400 Watts loss.

Table for Transformer Rating

Air conditioner (A/C)

• Before discussing in detail I will explain what is EER, otherwise it will be difficult to identify which equipment is efficient .

• EER > Energy Efficiency Ratio (EER) is the ratio of the cooling capacity of an air conditioner in British Thermal Units (BTU) per hour, to the total electrical input (in watts) under certain specified tests.

How an A/C is Star Rated ?

• As per current standards, an air-conditioner is measured for its energy efficiency(EER) by calculating the power it consumes to cool a room to 22° Celsius when it's 35 ° Celsius outside.

Cash Saved(A/c)Q. Energy and Saving for 1.5 Ton Windows or split A/c at different Star Rating if the maximum cooling capacity is 5200 Watts and a unit price is 2.5 Rs?

A. Star rating Input power EER Unit consumed Cost Cost Watts per day per month Saved/Yr

No-Star 2364 Watts 2.20 9.45 Units 709 Rs 0 Rs

1 Star 2261 Watts 2.30 9.04 Units 678 Rs 308 Rs

2 Star 2080 Watts 2.50 8.32 Units 624 Rs 851 Rs

3 Star 1926 Watts 2.70 7.70 Units 578 Rs 1313Rs

4 Star 1793 Watts 2.90 7.17 Units 538 Rs 1712Rs

5 Star 1677 Watts 3.10 6.71 Units 503 Rs 2059Rs

Refrigerator

Q. How much will be the money saved for a 250 liters frost free refrigerator with no star rating,1,2,3 and 5 star if unit cost=2.5 Rs?

A. Energy consumption per year Savings

For no star = 1100 kWh=1100 units 0 Rs/Yr

1 star = 977 kWh= 977 units 308Rs/Yr

2 star = 782 kWh= 782 units 795Rs/Yr

3 star = 626 kWh= 626 units 1185Rs/Yr

5 star = 400 kWh=400 units 1750Rs/Yr

Thank you