Standards & Labelling and Demand Side Management
Standards & Labelling and Demand Side Management
This domain tests BEE's star labelling scheme and DSM tools: load curves, peak clipping, valley filling, load shifting, strategic conservation and demand response. Expect appliance efficiency metrics and simple annual-consumption comparisons.
Core rules
- BEE labels are mandatory for notified appliances and voluntary for others; star ratings run from 1 to 5, with 5 most efficient. The label also gives annual energy consumption under standard test conditions.
- Metrics are appliance-specific: ISEER for room air conditioners, EER/COP for chillers, kWh/year or kWh/cycle for refrigerators and washing machines.
- DSM changes the shape or level of demand. Peak clipping cuts maximum demand; valley filling builds off-peak load; load shifting moves load without reducing total energy; strategic conservation reduces total energy.
- Time-of-day tariffs, smart meters and demand-response contracts are enabling instruments. DSM is not the same as load shedding, which curtails service.
Worked example
Two 1.5 TR room ACs deliver the same annual cooling of 4,000 kWh thermal. Model A has ISEER 4.0; Model B has ISEER 5.0. Annual electricity = cooling output ÷ ISEER: A = 1,000 kWh, B = 800 kWh. Saving = 200 kWh/year. At INR 8/kWh, that is INR 1,600/year. If Model B costs INR 8,000 more, simple payback is 5 years. The reasoning must keep cooling output in the same units and note that ISEER is a seasonal efficiency metric, not a instantaneous COP.
Traps
Confusing star rating with actual billed consumption; mixing EER and ISEER; treating DSM as only peak clipping; ignoring rebound effects; and comparing appliances with different capacities or test standards.