ITPEC FE Morning April 2021 Question 73
Which of the following is an appropriate explanation of HEMS?
Explanation
A system that networks home appliances to visualize and optimally control power use — HEMS is a Home Energy Management System.
A HEMS links appliances, lighting, air conditioning, solar panels and storage batteries in a household over a network. It shows the power being used and generated, so residents can see their consumption, and it controls the devices automatically to save energy or shift use to cheaper hours.
Answer (a)
Why not others:
- •(b) — converting the output of solar panels and fuel cells into household electricity is the job of a power conditioner
- •(c) — recovering useful parts from discarded appliances to cut waste is home appliance recycling
- •(d) — a heat pump water heater that makes much heat from little energy is an appliance HEMS might control, not HEMS itself
Key rule: An xEMS (HEMS for homes, BEMS for buildings, FEMS for factories) measures, visualizes and controls energy use over a network.
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