Refrigeration Application
Refrigeration Application - Related Videos
12:09
Introduction to Refrigeration
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2023
Source: Alexander S Rattner and Christopher J Greer; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA This experiment demonstrates the principles of vapor compression refrigeration. The vapor compression cycle is the dominant refrigeration technology, found in most refrigerators, freezers, air-conditioning systems, and heat pumps. In this cycle, cooling (heat acquisition) is achieved with low-pressure evaporation of refrigerant. Thermal...
07:18
Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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Cited by 5 •
2017
With solar energy as the driving force, a novel adsorption refrigeration system has been developed and experimentally investigated. Water vapor and zeolite formed the working pair of the adsorption system. This manuscript describes the setup of the experimental rig, the operation procedure, and the important results.
01:07
Refrigerators and Heat Pumps
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2023
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. A household refrigerator removes heat from the...
12:23
Bacterial Growth Curve Analysis and its Environmental Applications
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Luisa Ikner Bacteria are among the most abundant life forms on Earth. They are found in every ecosystem and are vital for everyday life. For example, bacteria affect what people eat, drink, and breathe, and there are actually more bacterial cells within a person’s body than mammalian cells. Because of the importance of bacteria, it is preferable to study particular species of bacteria...
FAQs
Lower pressure allows refrigerant to evaporate at a lower temperature. That temperature difference lets it absorb heat from the space or substance being cooled. The refrigerant then carries that energy toward the high-pressure side of the cycle. This pressure-temperature relationship is central to maintaining temperatures below the surrounding environment.
The compressor raises the refrigerant’s pressure after low-pressure evaporation, preparing it for condensation at a higher pressure. This step requires energy input, so it is a major part of the system’s energy balance. In physics terms, the compressor couples mechanical work to the heat-transfer cycle, allowing heat absorbed in the cooled region to be released outside.
The expansion device lowers the refrigerant’s pressure before it returns to the low-pressure part of the cycle. This pressure drop establishes the conditions needed for the next evaporation stage, where heat can be absorbed from the cooled space or substance. Without this reset, the repeating sequence of pressure changes and heat transfer could not be sustained.
Pressure and temperature should be considered together because their relationship indicates whether the refrigerant is operating in the intended low-pressure or high-pressure part of the cycle. Tracking these variables helps connect evaporation with heat absorption and condensation with heat release. Such measurements support performance evaluation and reveal whether the system is maintaining the required thermal conditions.
The target condition changes with the task. Food storage and pharmaceutical handling prioritize maintaining suitable temperatures for materials, while air conditioning focuses on comfort. Industrial manufacturing may require controlled thermal conditions during processing. These examples show that the same physics can support preservation, environmental control, and production, although the required operating conditions depend on the application.
Efficiency matters because the system must transfer heat while using energy to drive compression and maintain the required temperature. Examining pressure changes, heat absorption, and heat release helps identify how effectively the cycle performs. Better performance can reduce energy use and help limit environmental impact.