Increasing energy efficiency helps to use resources more economically. But what if greater efficiency in a complex system actually uses up more energy resources overall? This video explains this paradox of energy efficiency, also known as Jevons Paradox.

In this video, the need for energy efficiency in buildings is discussed and basic terminologies related to building physics are explained.
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In this video, you will learn this model answer:

A device is useful because the device can transfer energy from one useful energy store to another useful energy store.

However no device is 100% efficient. This is because the device will transfer energy to non-useful energy stores.

The energy that isn’t transferred to a useful energy store is called wasted energy, or dissipated energy. The useless energy stores are usually thermal energy stores of the surroundings.

The higher the efficiency of a device the less energy is being transferred to the useless surrounding energy stores

The equation for the efficiency of an energy transfer in terms of power is:

efficiency = useful output power transfer ÷ total input power transfer
. .

Rearrange the equation for the useful output energy transfer in terms of power is:

useful output power transfer = efficiency x total input power transfer

Rearrange the equation for the total input energy transfer in terms of power is:

total input power transfer = efficiency x useful output power transfer
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In this video we cover:
– The idea that devices aren’t 100% efficient
– What efficiency is
– The equation for efficiency
– Examples of how to calculate efficiency
– Why some devices like electric heaters are sometimes considered to be 100% efficient

General info:
– Suitable for all GCSE and IGCSE courses

Exam board specific info:
AQA – Everything is relevant to your course!
IGCSE Edexcel – Everything is relevant to your course!
Edexcel – Everything is relevant to your course!
OCR 21st Century – Everything is relevant to your course!
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Energy efficiency is measured as the ratio of energy output to energy input, as a percentage. The goal of improving energy efficiency is to deliver the same service to the end user, using less energy. Learn more about energy efficiency at www.studentenergy.org

Thank you to the Alberta Real Estate Foundation for sponsoring this episode of the Energy Systems Map.

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Student Energy is currently developing the Global Youth Energy Outlook, a global youth-led report that will engage 50,000 young people around the world in 2021 to gather their perspectives on energy. Want to take part? If you’re between 18-30, head to www.bit.ly/gyeo to complete the survey! You can win 0 cash prizes in each region, or a fully funded trip to the next International Student Energy Summit!

Student Energy is a global youth-led organization empowering the next generation of leaders who are accelerating the transition to a sustainable, equitable energy future. We work with a network of 50,000 young people from over 120 countries to build the knowledge, skills, and networks they need to take action on energy. Learn more at www.studentenergy.org

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Meat Vectors by Vecteezy: https://www.vecteezy.com/free-vector/meat
Milk Vectors by Vecteezy: https://www.vecteezy.com/free-vector/milk
Nature Vectors by Vecteezy: https://www.vecteezy.com/free-vector/nature
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When most people talk about “clean energy,” they often mean wind or solar power, and when they’re discussing “energy conservation,” they’re usually talking about doing things like remembering to turn off the lights. But energy conservation, sometimes called energy efficiency, IS clean energy just like solar and wind. It’s also cheaper than fossil fuels and doesn’t create pollution.
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Richard Trethewey checks out an Idea House in development and learns about energy efficiency building techniques.

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Richard Trethewey goes to Devens, MA to visit a new house with advance building techniques. He meets builder Dan Gainsboro who says the entire heating season will only cost 00 or less for this new house—considerably lower than what our homeowners were paying to heat their house. He shows Richard how the houses in the development are built using 2×6 walls with insulated panel sheathing for a water and air-tight shield. Walls are insulated on the inside and the window openings are wrapped with flashing tape and even the headers are insulated. They used triple glazed windows throughout. The finished Idea House is a lovely small scale home with an open floor plan. The light fixtures use LEDs and the appliances are all Energy Star rated. In the well-insulated basement, there’s no mechanical room because mini-split heat pumps are used to heat and cool the entire house. And finally, Dan shows Richard the solar panels on the south facing roof of the garage. On a sunny day, the panels generate enough electricity to power the house for a family of four.

Looking for more step by step guidance on how to complete projects around the house? Join This Old House Insider to stream over 1,000 episodes commercial-free: https://bit.ly/2GPiYbH

Plus, download our FREE app for full-episode streaming to your connected TV, phone or tablet: https://www.thisoldhouse.com/pages/streaming-app

About This Old House TV:
This Old House is America’s first and most trusted home improvement show. Each season, we renovate two different historic homes—one step at a time—featuring quality craftsmanship and the latest in modern technology. We demystify home improvement and provide ideas and information so, whether you are doing it yourself or hiring out contractors, you’ll know the right way to do things or the questions to ask. Our experts including general contractor Tom Silva, plumbing and heating expert Richard Trethewey, landscape contractor Jenn Nawada, master carpenter Norm Abram, and host Kevin O’Connor give you the tools you need to protect and preserve your greatest investment—your home.

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Building Energy Efficiency | This Old House
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Energy Efficiency | Energy | Physics | FuseSchool

You may have been told that you cannot create or destroy energy, but we certainly use it – and pay for it, so what does get used up?

See our video https://youtu.be/Um04eHOqGlM where we explained that it is the usefulness of the energy that gets used as the energy is dissipated as waste heat.

CREDITS
Animation & Design: Jean-Pierre Louw (behance.net/Jean-Pierre_Louw)
Narration: Dale Bennett
Script: Bethan Parry, Keith Ross & Alistair Haynes

SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT.

VISIT us at www.fuseschool.org, where all of our videos are carefully organised into topics and specific orders, and to see what else we have on offer. Comment, like and share with other learners. You can both ask and answer questions, and teachers will get back to you.

These videos can be used in a flipped classroom model or as a revision aid.

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You can find “energy saving” devices on the market that are little more than a capacitor that is wired across the ac lines. In this demonstration shot at Eaton Corp.’s Power Systems Experience Center, Dan Carnovale explains how measurements made with these devices installed can give misleading readings that imply energy savings where none really exist. Most often, unsuspecting victims get fooled by looking at read-outs of watts instead of a read-out of volt-amps.

Autumn is the perfect time to prepare your home for the cooler months ahead. Find out more: http://www.originenergy.com.au/asset/0APga9NbJqU

Discover more ways to save in our ‘Save with the Seasons’ Playlist: http://www.youtube.com/playlist?list=PLRynzGLkcnApi6Hj0vfEsg6wLDXrqz9Db

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This video was part of an energy efficiency awareness campaign that we collaborated on in 2010. These simple, low cost, energy saving tips are still as relevant as ever. For more information see our website: http://reductionrevolution.com.au/

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Builder and homeowner Al Rossetto believes that a good indoor air quality is just as important as energy efficiency. In this video Al describes several energy-saving and healthy construction details that he won’t build a home without.

Read about regular people who have built Energy Star rated homes with Al’s help: http://www.greenbuildingadvisor.com/blogs/dept/green-building-news/do-it-yourself-home-building-enabler
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