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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

696
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...
696
Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

500
The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
500
Average Power01:13

Average Power

884
In practical electrical applications, the concept of time-varying instantaneous power is not frequently utilized. Instead, focus shifts to the more practical quantity known as average power. Average power is determined by integrating the instantaneous power over a specified time period and subsequently dividing it by that duration.
884
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force...
669
Conservation of AC Power01:15

Conservation of AC Power

530
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
530
The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

1.0K
Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
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Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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Maximal nighttime electrical power generation via optimal radiative cooling.

Lingling Fan, Wei Li, Weiliang Jin

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    Nighttime radiative cooling enhances thermoelectric power generation, achieving over 2 W/m², a significant leap using existing technologies. This cost-effective system optimizes radiative emitters for maximum nighttime energy harvesting.

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    Area of Science:

    • Thermodynamics
    • Materials Science
    • Energy Harvesting

    Background:

    • Solar energy harvesting is limited to daytime.
    • Nighttime energy generation is crucial for continuous power supply.
    • Thermoelectric generators (TEGs) can convert waste heat into electricity.

    Purpose of the Study:

    • To systematically optimize nighttime thermoelectric power generation using radiative cooling.
    • To achieve high electrical power density using existing technologies.
    • To assess the economic feasibility of the system.

    Main Methods:

    • Investigated the influence of emissivity spectra, thermal convection, and thermoelectric figure of merit.
    • Optimized the area ratio between the TEG and the radiative cooler.
    • Developed and tested an optimized thermal radiation emitter for the cold side.

    Main Results:

    • Achieved an electrical power density greater than 2 W/m², two orders of magnitude higher than previous results.
    • Demonstrated that the TEG covers less than 1% of the system footprint, indicating economic feasibility.
    • An optimized emitter resulted in a 153% gain in power density compared to blackbody emitters.

    Conclusions:

    • Nighttime thermoelectric power generation utilizing radiative cooling is a viable and highly efficient energy harvesting method.
    • System optimization, particularly the thermal radiation emitter, is key to maximizing power output.
    • This technology offers a promising solution for continuous renewable energy generation without solar input.