Engineering
One of the drawbacks of fitness trackers and other wearable devices is that their batteries eventually run out of juice. But what if in the future, wearable technology could use body heat to power itself?
14 hours ago
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Energy & Green Tech
On a hot summer day, contractors snake wiring through the basement of a townhouse in southeast Washington to install a heat pump, a key component of the United States' multi-billion dollar push towards greater home electrification.
Sep 7, 2024
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Energy & Green Tech
The U.S. is nearing the end of one of its hottest summers on record. Across the nation, heat waves have driven peak electricity demand on some days to levels far exceeding seasonal averages.
Sep 5, 2024
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Engineering
A team of sustainable energy engineers at The Hong Kong University of Science and Technology, working with a pair of colleagues from the GD MIDEA Air-Conditioning Equipment Co., LTD., in China, has developed a personalized ...
Energy & Green Tech
The elevated temperatures this summer prompted many of us to crank up the air conditioning. In Switzerland, the energy used for cooling is approaching that for heating. What does that mean for power grids?
Sep 3, 2024
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Energy & Green Tech
Photovoltaics are set to meet over 40% of Switzerland's electricity needs by 2050. But solar power isn't always available when it's needed: there's too much of it in summer and too little in winter, when the sun shines less ...
Aug 31, 2024
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Engineering
Rice University researchers have developed a smart material that adjusts its transparency with changes in temperature, outperforming similar materials in terms of durability, transparency and responsiveness. The new polymer ...
Aug 28, 2024
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Energy & Green Tech
Lithium-ion batteries are everywhere, in cell phones, computers, electric vehicles, and even toys, to name only a few places. They have become an integral part of our everyday lives.
Aug 27, 2024
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Engineering
This summer's Western heat waves raise the specter of recent years' rotating power outages and record-breaking electricity demand in the region. If utilities across the area expanded current schemes to share electricity, ...
Aug 21, 2024
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Energy & Green Tech
Currently, industrial processes in the U.S. account for approximately a third of the country's carbon dioxide emissions—even more than the annual emissions from passenger vehicles, trucks, and airplanes combined. Decarbonizing ...
Aug 19, 2024
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In physics and thermodynamics, heat is the process of energy transfer from one body or system to another due to a difference in temperature. In thermodynamics, the quantity TdS is used as a representative measure of the (inexact) heat differential δQ, which is the absolute temperature of an object multiplied by the differential quantity of a system's entropy measured at the boundary of the object.
A related term is thermal energy, loosely defined as the energy of a body that increases with its temperature. Heat is also loosely referred to as thermal energy, although many definitions require this thermal energy to actually be in the process of movement between one body and another to be technically called heat (otherwise, many sources prefer to continue to refer to the static quantity as "thermal energy"). Heat is also known as "Energy".
Energy transfer by heat can occur between objects by radiation, conduction and convection. Temperature is used as a measure of the internal energy or enthalpy, that is the level of elementary motion giving rise to heat transfer. Energy can only be transferred by heat between objects - or areas within an object - with different temperatures (as given by the zeroth law of thermodynamics). This transfer happens spontaneously only in the direction of the colder body (as per the second law of thermodynamics). The transfer of energy by heat from one object to another object with an equal or higher temperature can happen only with the aid of a heat pump, which does work.
This text uses material from Wikipedia, licensed under CC BY-SA
