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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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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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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.
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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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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Experimental Study on a Multi-Evaporator Refrigeration System Equipped with EEV-Based Ejector.

Jia Yan1, Chen Wang2,3

  • 1School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China.

Entropy (Basel, Switzerland)
|September 23, 2022
PubMed
Summary

This study introduces an electronic expansion valve (EEV)-based ejector to improve multi-evaporator refrigeration systems. The ejector-based mode enhanced system performance by 3.6% compared to the pressure-regulating valve (PRV) mode.

Keywords:
EEV-based ejectorcoefficient of performanceejector-based multi-evaporator refrigeration systementrainment ratiorefrigerator–freezer

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Area of Science:

  • Thermodynamics and Refrigeration Engineering
  • Energy Systems Analysis

Background:

  • Multi-evaporator refrigeration systems often utilize pressure-regulating valves (PRVs) and electronic expansion valves (EEVs) for pressure control.
  • Throttling losses in PRVs can reduce overall system efficiency.

Purpose of the Study:

  • To experimentally investigate the performance of a novel electronic expansion valve (EEV)-based ejector in a multi-evaporator refrigeration system.
  • To compare the efficiency of an ejector-based mode against a traditional PRV-based mode.
  • To analyze the impact of ejector design parameters and operating conditions on system performance.

Main Methods:

  • An experimental rig was designed and established, capable of operating in both PRV-based and EEV-based ejector modes.
  • System performance was evaluated under varying cooling loads.
  • The influence of the EEV-based ejector's spindle-blocking area percentage and condensing temperature was systematically studied.

Main Results:

  • The ejector-based mode demonstrated a 3.6% improvement in system performance compared to the PRV-based mode.
  • Both the entrainment ratio and the coefficient of performance decreased as the ejector spindle-blocking area percentage increased.
  • Condensing temperature exerted a more significant influence on system performance than the ejector spindle-blocking area percentage.

Conclusions:

  • The integration of an EEV-based ejector offers a viable strategy to enhance the efficiency of multi-evaporator refrigeration systems.
  • Optimizing the ejector spindle-blocking area percentage and managing condensing temperature are crucial for maximizing system performance.
  • The EEV-based ejector effectively mitigates throttling losses, leading to improved overall system efficiency.