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Related Concept Videos

Refrigerators and Heat Pumps01:07

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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Vapor Pressure Lowering03:28

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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
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The Carnot Cycle and the Second Law of Thermodynamics01:20

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The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
Since the individual steps in a Carnot cycle can be reversed, the entire cycle is, thus, reversible. If a Carnot cycle is reversed, it becomes a Carnot refrigerator. It extracts heat Qc from a cold reservoir at...
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Adiabatic Processes for an Ideal Gas01:18

Adiabatic Processes for an Ideal Gas

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When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...
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Vapor Pressure02:34

Vapor Pressure

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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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Updated: Dec 5, 2025

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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Vapour absorption refrigeration system for rural cold storage: a comparative study.

Divya Arputham Selvaraj1, Kirubakaran Victor2

  • 1Centre for Rural Energy, Gandhigram Rural Institute - Deemed to be University, Chinnalapatti, India.

Environmental Science and Pollution Research International
|October 16, 2020
PubMed
Summary

This study compares conventional vapor compression refrigeration (VCR) with vapor absorption refrigeration (VAR) systems. It highlights power quality issues in VCR and analyzes alternatives for sustainable cold storage solutions.

Keywords:
Global warmingOzone depletionPower factorRefrigerantVARVCR

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Area of Science:

  • Agricultural Engineering
  • Thermodynamics
  • Environmental Science

Background:

  • Cold storage is vital for agricultural product value addition and farmer livelihoods.
  • Vapor compression refrigeration (VCR) technology contributes to global warming and ozone depletion.
  • International regulations restrict refrigerants, necessitating alternative cooling solutions.

Purpose of the Study:

  • To investigate power quality challenges in conventional VCR systems.
  • To conduct a comparative analysis of VCR and vapor absorption refrigeration (VAR) systems.
  • To evaluate alternative refrigeration technologies for sustainable cold storage.

Main Methods:

  • Comparative analysis of VCR and VAR systems.
  • Power factor analysis.
  • Temperature measurement of both refrigeration technologies.

Main Results:

  • Identified power quality challenges in conventional VCR systems.
  • Provided a comparative performance analysis of VCR and VAR.
  • Reported temperature variations between the two systems.

Conclusions:

  • Vapor absorption refrigeration (VAR) presents a potential alternative to VCR systems.
  • Addressing power quality issues in VCR is crucial.
  • Further research into sustainable refrigeration is essential for the agricultural sector.