Engineering
In the quest for advanced vehicles with higher energy efficiency and ultra-low emissions, Oak Ridge National Laboratory researchers are accelerating a research engine that gives scientists and engineers an unprecedented view ...
Dec 21, 2020
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282
Energy & Green Tech
Millions of Americans have already been sweltering through heat waves this summer, and forecasters warn of hot months ahead. July 3 and 4, 2023, were two of the hottest days, and possibly the hottest, on satellite record ...
Jul 5, 2023
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5
Engineering
Researchers from the University of Glasgow have developed a new type of heat pump, a flexible heat pump technology, which could help households save on their energy bills and contribute towards net-zero emissions goals.
Aug 1, 2022
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1929
Engineering
Many people beat the summer heat by cranking the air conditioning. However, air conditioners guzzle power and spew out millions of tons of carbon dioxide daily. They're also not always good for your health—constant exposure ...
Aug 18, 2020
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278
Engineering
In Switzerland, 50 to 60 percent of new homes are equipped with heat pumps. These systems draw in thermal energy from the surrounding environment—such as from the ground, air, or a nearby lake or river—and turn it into ...
Jul 3, 2019
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4
Energy & Green Tech
"It is the first domestic commercial unit with zero direct and indirect emissions. Currently, there are already units that use the same technology as ours, which is aerothermal energy, but they do not use a natural fluid ...
Apr 6, 2022
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136
Energy & Green Tech
The need to take homes off gas has increased ever since the conflict in Ukraine. A heat battery with salt and water as simple components could provide a quick and large-scale solution for over three million households in ...
Apr 25, 2022
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225
Engineering
What if solar cells worked at night? That's no joke, according to Jeremy Munday, professor in the Department of Electrical and Computer Engineering at UC Davis. In fact, a specially designed photovoltaic cell could generate ...
Jan 30, 2020
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1394
Energy & Green Tech
To battle the summer heat, office and residential buildings tend to crank up the air conditioning, sending energy bills soaring. Indeed, it's estimated that air conditioners use about 6 percent of all the electricity produced ...
Nov 8, 2018
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477
Energy & Green Tech
While many advancements have been in improving its efficiency, the refrigerator still consumes considerable amounts of energy each year.
Mar 28, 2019
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258
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
