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Tag:

waste heat

Air Conditioning Can Raise Urban Nighttime Temperature by 2 Degrees

Air Conditioning Can Raise Urban Nighttime Temperature by 2 Degrees

written by Yale Environment 360

Excess heat from air conditioners raises outdoor temperatures at night by nearly 2 degrees F (1 degree C), worsening the urban heat island effect and increasing cooling demands, according to research from Arizona State University.

Studying the Phoenix metropolitan area, researchers found that air conditioning systems pumped more waste heat into the air during the day, but the effect on near-surface temperatures was negligible. The same was not true for nighttime temperatures, however, when waste heat significantly boosts air temperatures because of nighttime atmospheric conditions.

Air conditioning systems can consume more than 50 percent of total electricity during extreme heat, the researchers note, and summertime extreme-heat days are projected to become more frequent and intense as a result of climate change.

Redirecting waste heat from air conditioning systems to household appliances such as water heaters, for example, could help alleviate the problem, the scientists say. They project that such strategies would save at least 1,200 to 1,300 megawatt-hours of energy per day in the Phoenix metropolitan area alone.



June 10, 2014 2 comments
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Alphabet Generates Energy from Nanostructured Thermoelectric Devices

written by Walter Wang

Alphabet Energy (Alphabet) is a Hayward, California, company that develops thermoelectric materials and products that convert waste heat to electric power.

Alphabet’s web site provides this overview of the concept of thermoelectrics:

Thermoelectrics are solid-state semiconductors that

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March 25, 2013 0 comment
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Panasonic Creates More Efficient and Compact Thermoelectric Solution

written by Walter Wang

Capturing excess heat to convert it into electricity can help the world become more energy-efficient, but currently technologies are expensive and not efficient enough. Panasonic is hoping to change that in the coming years with a tubular thermoelectric technology it has developed to tap wasted heat from sources such as hot springs and factories and

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March 5, 2013 0 comment
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Major Cities Alter Weather Across Long Distances, Study Says

written by Yale Environment 360

Heat generated in major metropolitan areas is altering the character of the jet stream and other atmospheric systems, at times affecting the weather thousands of miles away, a new study says.

Writing in the journal Nature Climate Change, a team of scientists reports that so-called “waste heat”

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January 29, 2013 0 comment
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District Heating and Cooling Has Huge Potential

written by Edouard Stenger

According to a recent study carried out by Euroheat & Power (EHP), the international association of district heating and cooling, the value of energy wasted each year in the European Union amounts to a whopping 1.000 euros per citizen. This amounts to up to 500 billion euros per year, or 638 billion USD.

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May 21, 2012 0 comment
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CHP: Not the Brad and Jen of Energy, but….

written by Walter Wang

I hesitate to start this blog with the words “combined heat and power.” You might stop reading.

Okay, so it’s not the Brad and Jen of energy. (That would be solar and wind.) But what it lacks in glamour, it makes up for in constancy and results. It’s an old guy, been around for about a century. And while its name might not sound green, it

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September 29, 2011 3 comments
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Van Gogh Comes Alive at the National Gallery

written by Walter Wang

This summer, The National Gallery in London is engaging public audiences with an 8,000 plant rendering of Van Gogh’s A Wheatfield with Cypresses (1889).

Over 25 varieties of flora are offering museum-goers sweeter, cleaner air and a setting ripe for ecological discussion as the National Gallery forwards their plan

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June 9, 2011 0 comment
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Study Finds Efficient Method to Produce Electricity from Waste Heat

written by Yale Environment 360

U.S. researchers say they have created a material that can generate electricity from waste heat with greater efficiency than other technologies. Scientists at Northwestern University placed nanocrystals of rock salt into lead telluride to create a material with the potential to capture waste heat from factory equipment, vehicle exhaust, and other industrial

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January 20, 2011 1 comment
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