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Related Concept Videos

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Refrigerators and Heat Pumps

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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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Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
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Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 x 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that, in the actual operation of an automobile engine, the compression is not...
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Efficiency of The Carnot Cycle01:16

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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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Conservation of Energy in Control Volume01:14

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Consider a turbine operating under steady-flow conditions. The control volume is drawn around the turbine, with fluid entering at one point and exiting at another. The turbine extracts energy from the fluid, which performs mechanical work (shaft work).
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Heating and Cooling Curves02:44

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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.
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Updated: Aug 30, 2025

Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
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Energy Analysis of Precooling Air Compressor System.

Yu Hu1,2, Weiqing Xu1,2, Guanwei Jia3

  • 1School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China.

Entropy (Basel, Switzerland)
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

Pre-cooling air compressor systems offer significant energy savings for net zero carbon emissions. This study demonstrates their feasibility and economic viability, increasing efficiency by up to 2%.

Keywords:
air compressor systemenergy conservation technologypneumatic-electrical ratiopre-cooling

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Area of Science:

  • Engineering
  • Energy Systems
  • Environmental Science

Background:

  • Industrial air compressor systems are major energy consumers.
  • Energy saving is crucial for achieving net zero carbon emissions.

Purpose of the Study:

  • To analyze the energy efficiency and feasibility of a pre-cooling air compressor system.
  • To investigate the impact of environmental factors on system performance.
  • To verify the technical and economic viability through a pilot project.

Main Methods:

  • Proposed a pre-cooling air compressor system.
  • Analyzed energy efficiency considering additional cooling energy consumption.
  • Evaluated system applicability based on environmental temperature and humidity.
  • Conducted a pilot project for verification.

Main Results:

  • The pre-cooling air compressor system's efficiency is influenced by ambient temperature and humidity.
  • A pilot project showed an approximate 2% increase in the annual pneumatic-electrical ratio at a 2°C pre-cooling temperature in China.
  • The system demonstrated technical feasibility and economic benefits.

Conclusions:

  • The pre-cooling air compressor system is a viable method for industrial energy saving.
  • The system's effectiveness varies with regional climate and seasons.
  • Further implementation can contribute to net zero carbon emission goals.