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A thermal expansion valve or thermostatic expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in vapor-compression refrigeration and air conditioning systems that controls the amount of refrigerant released into the evaporator and is intended to regulate the superheat of the refrigerant that flows out of the evaporator ...
A multi-evaporator system is a vapor-compression refrigeration system generally consisting of four major components: Evaporator; Compressor; Condenser; Thermal expansion valve; Sometimes in a refrigerator several loads are varied. Refrigerators used to function at different loads operated under different condition of temperatures and pressures.
Many refrigeration systems have the expansion valve set up inside the room being cooled, consequently generating productive refrigeration if absorbing heat from the room, to produce this kind of flash-gas between the expansion and the evaporator. Besides, the expansion valve deregulates its operation if the fluid arriving to it is boiling.
In simple commercial refrigeration systems the compressor is normally controlled by a simple pressure switch, with the expansion performed by a capillary tube or thermal expansion valve. In more complex systems, including multiple compressor installations, the use of electronic controls is typical, with adjustable set points to control the ...
Furthermore, electronic expansion valves enable refrigeration systems to work more precisely and efficiently, which is a major factor driving the electronic expansion valves market outlook. Increased awareness of carbon emissions in many parts of the world has led to an increase in the adoption of electronic expansion valves in a variety of end ...
Vapor-compression refrigeration [6] For comparison, a simple stylized diagram of a heat pump's vapor-compression refrigeration cycle: 1) condenser, 2) expansion valve, 3) evaporator, 4) compressor (Note that this diagram is flipped vertically and horizontally compared to the previous one) [7] Temperature–entropy diagram of the vapor-compression cycle.
In refrigeration systems, subcooling the refrigerant is necessary to ensure the completion of the remaining stages of the refrigeration cycle. The subcooling stage provides certainty that the refrigerant is fully liquid before it reaches the next step on the cycle, the thermal expansion valve, where the presence of gas can be disruptive. [1]
A refrigeration system utilizes a compressor, a turboexpander and an electric motor. Depending on the operating conditions, the turboexpander reduces the load on the electric motor by 6–15% compared to a conventional vapor-compression refrigeration system that uses a throttling expansion valve rather than a turboexpander. [12]
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