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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.
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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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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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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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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...
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Passively Ultra Cooling Patch Enabling High-Efficiency Power-Water Cogeneration.

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This study introduces an ultra-cooling patch (UCP) to cool photovoltaic (PV) panels, recovering waste heat for freshwater production. The passive cooling patch significantly boosts PV panel efficiency and longevity.

Keywords:
evaporation coolingheat and mass transferpatchphotovoltaicswater‐energy nexus

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Area of Science:

  • Renewable Energy Engineering
  • Materials Science
  • Thermal Management

Background:

  • Photovoltaic (PV) systems are crucial for renewable energy but suffer efficiency losses due to waste heat from the photothermal effect.
  • Reduced efficiency and longevity of PV panels are significant challenges in widespread adoption.

Purpose of the Study:

  • To develop and evaluate a passive cooling strategy for PV panels using an ultra-cooling patch (UCP).
  • To enhance PV system efficiency and enable waste heat recovery for applications like freshwater production.

Main Methods:

  • Development of a flexible and adhesive ultra-cooling patch (UCP) for easy integration with PV panels.
  • Reconfiguration of the UCP into a fined structure to modify heat transfer pathways and intensify heat dissipation.
  • Experimental validation of the UCP's cooling performance and impact on PV panel efficiency through outdoor testing.

Main Results:

  • Achieved a cooling power of nearly 700 W m-2 and recovered over 70% of waste heat.
  • Demonstrated a significant PV panel temperature reduction of 29 °C.
  • Increased PV panel maximum power density by over 28%.

Conclusions:

  • The UCP offers an effective passive cooling solution for PV systems, enhancing performance and longevity.
  • The technology shows high efficiency, scalability, and cost-effectiveness, with commercial potential for addressing the energy-water crisis.