# Slides 4.4: Conserving Energy and Water: the Home Energy Audit Slide outline for Lesson 4.4. Day 1 has twelve slides; Day 2 has nine. [Sal: slide 5 is yours. Put one photo from your Penn State zero-energy home project on it and tell the story in two minutes.] # Day 1 ## Slide 1: Where does it go? - Lesson 4.4, Day 1 - Today: where a home's energy and water go, and the math that shows what a fix is worth - Tomorrow: you audit this room Image: a house drawn in cross-section with arrows leaving through the roof, the windows, the faucet, and the outlets. ## Slide 2: Do now - Name three things in your home using electricity right now while nobody is using them - Guess: what does one light bulb cost to run for a year? - Two minutes Notes: Write the three-things list on the board and circle the phantom loads. Hold up the two bulbs for the hook. ## Slide 3: Energy in a home - Heating and cooling: about half - Heating water: about a fifth - Everything else: lights, fridge, laundry, electronics, cooking Image: a pie chart with a furnace icon on the biggest slice, a water heater on the next, and a bulb, a fridge, and a TV on the rest. Notes: Rounded from U.S. EIA residential data. Students fill Part 1. ## Slide 4: Water in a home - Toilets: about a quarter - Showers: a fifth - Faucets: a fifth - Laundry: a sixth - Leaks: about a tenth. A tenth of the water bill goes down a drip. Image: a pie chart with a toilet, a showerhead, a faucet, a washer, and a drip icon. Notes: Rounded from EPA WaterSense. ## Slide 5: A zero-energy home - [Sal: your Penn State project. One photo, three lines: what it is, what it cost, what surprised you.] Image: [Sal: your photo or drawing.] Notes: Two minutes. This is the story students will remember from this lesson. ## Slide 6: Phantom load - A device that draws power while "off": chargers, TVs, cable boxes, game consoles, microwaves with clocks - About 5 to 10 percent of a home's electricity - Watch the meter Image: a plug-in electricity meter with a game console plugged in, reading 14 W. Notes: If you have the meter, plug in the biggest phantom you tested. If not, the number on the slide stands. ## Slide 7: Two words - Conservation: using less of a resource on purpose so it lasts (the state's definition in plain words) - Efficiency: getting the same result with less - Turning off the light is conservation. The LED is efficiency. You want both. Notes: CTE SUS 3. d) is "define conservation as it applies to energy." Students write both definitions. ## Slide 8: The math, one bulb - 60 W x 5 hours x 365 days = 109,500 Wh - Divide by 1,000 = 109.5 kWh - x $0.25 = $27.38 a year - The LED: 9 W. 16,425 Wh = 16.4 kWh = $4.11 - Savings: $23.27 per bulb. Twenty bulbs: about $465. Image: the two bulbs side by side with the wattage circled on each. Notes: Work it on the board with the template. "Watt-hours are pennies, kilowatt-hours are dollars." ## Slide 9: The math, a drip and a thermostat - One drip per second is about 5 gallons a day - 5 x 365 = 1,825 gallons a year, about 30 bathtubs - Thermostat: each degree set back for 8 hours saves about 1 percent of the heating bill - 7 degrees at night saves about 7 percent. The fix is a sweater. Image: a faucet with one drop falling, and a thermostat dial turned to 65. Notes: Pairs do the three practice problems on the handout, Part 2. Check with the pair beside them. ## Slide 10: The audit checklist - Lights: on in empty rooms? LED? - Phantom: chargers, screens, consoles - Heat: thermostat, open windows, blocked vents, drafts - Water: drips, a running toilet, shower length - Appliances: fridge seal, full loads, cold laundry - Score each line: OK, Fix (free), Fix ($) Notes: Walk the twelve lines in Part 3. ## Slide 11: Practice on a bedroom - A lamp on with nobody in the room, old bulb - A laptop charger plugged in, no laptop - A space heater running with the window open two inches - A radiator with a dresser in front of it Image: a bedroom photo with those four things visible. Notes: Score it as a class, one line at a time. Every line here is a free fix except the bulb. ## Slide 12: Exit card - 3 places a home's energy goes - 2 phantom loads you will unplug tonight - 1 number from today's math you will remember Notes: Assign five teams and five zones of the room for tomorrow before they leave. # Day 2 ## Slide 13: Audit day - Lesson 4.4, Day 2 - This room is the client - Five zones, one team each, ten minutes Image: the classroom with five zones outlined. ## Slide 14: Do now - One bulb: 60 watts, 5 hours a day, 365 days - How many watt-hours? - Divide by 1,000: how many kilowatt-hours? - Two minutes Notes: 109,500 Wh; 109.5 kWh. Leave it on the board. ## Slide 15: Audit the room - Take the checklist and a clipboard to your zone - Score all twelve lines - Every fix: free or money - I planted something in every zone. Find it. Notes: Circulate. Reveal the planted wastes at ten minutes. ## Slide 16: Audit the apartment - The Marchetti-Oyelaran apartment, Part 4 - Two adults, one child, a rental; the landlord pays for heat, the family pays for electricity and hot water - Read it room by room; score the same twelve lines - Ten minutes Notes: Watch for the heat lines. The family does not pay for heat, which changes who should fix what. ## Slide 17: Twelve fixes - Each has a cost and an estimated yearly saving - Cross out the two that cost more than $50 - Rank the other ten by savings, highest first - Payback = cost / savings per year Image: the twelve-fix table from the handout. Notes: Common mistake is ranking by cost. Say it twice: cheapest first is the filter; savings is the rank. ## Slide 18: Who pays? - The landlord pays for heat. Who should buy the weatherstripping? - The family pays for hot water. Who should buy the low-flow showerhead? - The fridge seal is torn. Whose fridge is it? Notes: Take three answers. This comes back in the Design a Room budget. ## Slide 19: Read the bill - Electricity used: 650 kWh - Supply $0.12 per kWh; delivery $0.13 per kWh; together $0.25 - Basic service charge $18: the same every month, even at zero - Total $180.50 - Ten LEDs save about $230 a year: next month's bill drops about $19 Image: the sample bill from the handout with the five numbers boxed. ## Slide 20: Exit card - Your top three fixes - One sentence: why the first one is first Notes: The quiz in Lesson 4.5 has one energy math item and one water math item with the numbers given. ## Slide 21: Reset the room - Turn off what we turned on to find it - Chargers unplugged, windows closed - This room is now audited. Keep it that way.