Energy & Green Tech

A communal energy hub

The amount of energy produced by renewable sources ebbs and flows. The Fraunhofer Institute for Industrial Mathematics ITWM has found a smart work-around for these fluctuations. Its scientists developed an innovative energy ...

Energy & Green Tech

Connecting energy production and storage

The good news is that renewables account for nearly 50 percent of electricity generated in Germany. The bad news is that they lack the flexibility to adapt to the day's fluctuating electricity demand. They only furnish electrical ...

Engineering

New coating hides temperature change from infrared cameras

An ultrathin coating developed by University of Wisconsin-Madison engineers upends a ubiquitous physics phenomenon of materials related to thermal radiation: The hotter an object gets, the brighter it glows.

Energy & Green Tech

A new smart-facade lift for older buildings

Can a smart new facade improve air quality in older buildings, cut energy demands on heating and cooling systems, and perhaps mitigate carbon emissions to some extent? A detailed answer might lie in research published in ...

Consumer & Gadgets

Locking down your smart home with blockchain

The concept of the smart home has been around for many decades, but it is only in recent years with the advent of the so-called "internet of things," IoT, that meters and monitoring, cameras, locking systems, heating systems, ...

Other

Tokyo's main Olympic stadium ready to fight heat

Construction of the $1.4 billion main Tokyo Olympic venue has officially completed, constructors said on Saturday, and is set to fight excessive heat with a nature-inspired design.

Energy & Green Tech

Making ceramic tile production greener with reused heat

With its wide range of applications from construction to consumer goods, industrial processes and cutting-edge technologies, the ceramics industry is an integral part of EU manufacturing. A key component of energy-intensive ...

Energy & Green Tech

Turning waste heat into hydrogen fuel

Hydrogen as an energy carrier can help us move away from fossil fuels, but only if it is created efficiently. One way to improve efficiency is to use waste heat that's left over from other industrial processes.

Energy & Green Tech

Farewell, oil: It's time to turn our backs on an old friend

They heat our homes, power the coffee maker and keep the factories that make our clothes running. They serve as raw material for our yogurt cups, transport us to work and bring food to the shops. Fossil fuels—oil, coal ...

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Heat

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