Engineering
There's a patch of concrete on Drexel University's campus that could portend a frost-free future for sidewalks and highways in the Northeast.
Mar 18, 2024
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1012
Energy & Green Tech
Plant-covered roofs have become a regular sight in Portland, Oregon. The city is a leader in incorporating green infrastructure for stormwater management, including free street trees, rebates for small residential housing ...
May 4, 2022
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348
Engineering
Engineers at MIT and the National Renewable Energy Laboratory (NREL) have designed a heat engine with no moving parts. Their new demonstrations show that it converts heat to electricity with over 40 percent efficiency—a ...
Apr 13, 2022
2
8184
Energy & Green Tech
Australia's energy transition is well under way. Some 3 million households have rooftop solar and sales of medium-sized electric cars are surging. But as we work towards fully electric households powered by renewable energy, ...
Jun 5, 2023
3
203
Engineering
The energy systems that power our lives also produce wasted heat—like heat that radiates off hot water pipes in buildings and exhaust pipes on vehicles. A new flexible thermoelectric generator can wrap around pipes and ...
Jan 21, 2022
6
1084
Energy & Green Tech
By installing a heat pump in his house in the hills of Oslo, Oyvind Solstad killed three birds with one stone, improving his comfort, finances and climate footprint.
Oct 29, 2023
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27
Energy & Green Tech
Using a unique hydrogel, scientists in Saudi Arabia created a solar-driven system that successfully grows spinach by using water drawn from the air while producing electricity. The proof-of-concept design, described March ...
Mar 1, 2022
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368
Energy & Green Tech
MIT engineers have come up with a conceptual design for a system to store renewable energy, such as solar and wind power, and deliver that energy back into an electric grid on demand. The system may be designed to power a ...
Dec 6, 2018
10
2003
Engineering
By revamping a forgotten heat recovery technique used in the design of Montreal's Royal Victoria Hospital, McGill University researchers say modern temperature control and ventilation design could be transformed.
Jan 23, 2024
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93
Engineering
Indoor air pollution may have met its match. Today, scientists will report that they have designed catalyst-coated lampshades that transform indoor air pollutants into harmless compounds. The lampshades work with halogen ...
Aug 16, 2023
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75
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
