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Related Concept Videos

Heating and Cooling Curves02:44

Heating and Cooling Curves

When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from the...
Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
Mechanism of heat transfer01:19

Mechanism of heat transfer

Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is the kilocalorie...
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.

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Updated: Jul 11, 2026

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
07:18

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector

Published on: October 18, 2017

Solar heating and cooling.

J A Duffie, W A Beckman

    Science (New York, N.Y.)
    |January 16, 1976
    PubMed
    Summary

    Solar heating technology is ready for widespread use, offering competitive costs. Solar cooling is emerging, with ongoing research poised to expand its applications and market potential.

    Area of Science:

    • Renewable Energy Technologies
    • Building Energy Systems
    • Solar Thermal Applications

    Background:

    • Current engineering capabilities support the design, installation, and utilization of solar space and water heating systems.
    • Solar-generated energy is cost-competitive with high-cost conventional heating methods like fuel-generated and electrical resistance heating.

    Purpose of the Study:

    • To assess the current state and future potential of solar energy for building applications, focusing on heating and cooling.
    • To identify technological advancements and challenges in solar thermal and solar cooling systems.
    • To evaluate the economic and political factors influencing solar energy adoption.

    Main Methods:

    • Review of existing solar heating and cooling technologies.
    • Analysis of cost-competitiveness with conventional energy sources.

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    Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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    Last Updated: Jul 11, 2026

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  • Exploration of ongoing research and development in solar collector and cooling cycle advancements.

    • Main Results:

    • Solar space and water heating technologies are mature and economically viable.
    • Solar cooling technologies are in the experimental phase, with several promising but underexplored approaches.
    • Advancements in collector technology could enable higher temperature delivery, benefiting solar cooling cycles and expanding applications.

    Conclusions:

    • Solar energy is poised to significantly impact the national energy economy and individual finances within the next decade.
    • The widespread adoption of solar energy hinges on political decisions rather than technological readiness.
    • Development of solar cooling presents opportunities for new markets, including retrofitting existing buildings.