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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
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Power Factor Correction01:20

Power Factor Correction

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The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
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Conservation of AC Power01:15

Conservation of AC Power

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The principle of power preservation is applicable to both ac and dc circuits. This principle, when applied to AC power, asserts that the complex, real, and reactive powers produced by the source are equal to the total complex, real, and reactive powers absorbed by the loads. When two load impedances are connected in parallel to an ac source V, the complex power provided by the source can be calculated using the relation
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Efficiency of The Carnot Cycle01:16

Efficiency of The Carnot Cycle

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The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Basic limit for the efficiency of coherence-limited solar power conversion.

Heylal Mashaal, Jeffrey M Gordon

    Optics Letters
    |August 29, 2014
    PubMed
    Summary

    This study derives a fundamental limit for solar power conversion efficiency. It generalizes existing limits to include variable solar concentration and advanced devices like rectifying antennas.

    Area of Science:

    • Physics
    • Renewable Energy
    • Thermodynamics

    Background:

    • The Landsberg limit provides a theoretical maximum efficiency for solar energy conversion.
    • Previous models often assumed specific conditions for solar concentration and device types.

    Purpose of the Study:

    • To derive a generalized upper bound for solar power conversion efficiency.
    • To extend the Landsberg limit to accommodate variable solar concentration and angular confinement.
    • To include coherence-limited devices in efficiency calculations.

    Main Methods:

    • Theoretical derivation of efficiency limits.
    • Generalization of thermodynamic principles for blackbody radiation.
    • Analysis of arbitrary solar and sky view factors.

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    Main Results:

    • A new, generalized upper bound for solar power conversion efficiency is established.
    • The derived limit applies to systems with arbitrary concentration ratios.
    • The efficiency bound is shown to be applicable to coherence-limited devices, such as rectifying aperture antennas.

    Conclusions:

    • The generalized efficiency limit offers a more comprehensive understanding of solar energy conversion potential.
    • This work provides a theoretical foundation for optimizing novel solar energy harvesting technologies.
    • The findings are relevant for the development of advanced solar power systems and rectenna designs.