Refrigerant system with reheat function provided by auxiliary heat exchanger
a technology of reheat function and refrigerant system, which is applied in the direction of fluid circulation arrangement, refrigeration machines, lighting and heating apparatus, etc., can solve the problems of refrigerant cycle design challenges and the inability to fully develop variations of this basic concept, and achieve the effect of greater cooling capacity
Inactive Publication Date: 2006-01-12
CARRIER CORP
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Benefits of technology
[0008] More specifically in the embodiment dealing with the liquid-suction heat exchanger, refrigerant downstream of the evaporator is utilized to subcool the refrigerant approaching the evaporator. In this case, a portion of the suction line leading to the compressor inlet or liquid suction heat exchanger itself is placed in the path of at least a portion of an airflow passing over the evaporator. As described above, the reheat function is operable to heat the air to a desired temperature, while providing the air dehumidification in the evaporator. As the air is heated while passing over the liquid-suction heat exchanger, it cools the refrigerant in this liquid-suction heat exchanger, which is desirable, as it improves the system capacity and efficiency.
Problems solved by technology
This has presented design challenges to refrigerant cycle designers.
However, variations of this basic concept have yet to be fully developed.
Method used
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[0017] A refrigerant system 20 is illustrated in FIG. 1 having a compressor 22 delivering a refrigerant to a condenser 24. An auxiliary heat exchanger 26 (liquid-suction heat exchanger in this case) is positioned downstream of the condenser 24, and upstream of a main expansion device 28. The refrigerant passes through an evaporator 30 downstream of the main expansion device 28, and an air moving device 32 moves air over the evaporator 30, with the air then being moved into an environment to be conditioned. As can be seen in FIG. 1, downstream of the evaporator 30, the refrigerant once again enters an auxiliary liquid-suction heat exchanger 26 at point 34, and exits at point 36, subcooling the refrigerant passing to the main expansion device 28. Thus, when the refrigerant reaches the evaporator 30, it will have a greater cooling capacity than it otherwise would possess. As can be appreciated, the refrigerant passing from the condenser 24 to the main expansion device 28 is generally i...
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In disclosed embodiments of this invention, the main flow of refrigerant is subcooled by another refrigerant stream in an auxiliary heat exchanger. The auxiliary heat exchanger is either an economizer heat exchanger or a liquid-suction heat exchanger. In the case of the economizer heat exchanger, the smaller tapped portion of the refrigerant is returned into the intermediate compression stage. In the case of the liquid-suction heat exchanger, the refrigerant leaving the evaporator subcools the refrigerant in the main line as it leaves the condenser. In either case, the refrigerant approaching the evaporator is subcooled and greater cooling capacity is achieved. At the same time, the reheat function is provided by passing a stream of air over the auxiliary heat exchanger. This air additionally cools both refrigerant flows in the auxiliary heat exchanger, which is desirable as it further increases the subcooling of the liquid refrigerant and also reduces the temperature of the vapor refrigerant entering the compressor. This results in improved system efficiency and capacity, while at the same time air is being dehumidified in a reheat cycle.
Description
BACKGROUND OF THE INVENTION [0001] This application relates to the provision of a reheat function in a refrigerant system wherein an auxiliary heat exchanger is utilized to subcool refrigerant approaching an evaporator. [0002] Refrigerant systems are utilized to control the temperature and humidity of air in various environments. In a typical refrigerant system, a refrigerant is compressed in a compressor and delivered to a condenser. In the condenser, heat is exchanged between outside ambient air and the refrigerant. From the condenser, the refrigerant passes to an expansion device, at which the refrigerant is expanded to a lower pressure and temperature, and then to an evaporator. In the evaporator heat is exchanged between the refrigerant and the indoor air, to condition the indoor air. When the refrigerant system is operating, the evaporator cools the air that is being supplied to the indoor environment. In addition, as the temperature of the indoor air is lowered, moisture usua...
Claims
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Login to View More IPC IPC(8): F25B43/02F25B1/00F25B41/00
CPCF25B2400/13F25B40/00
Inventor LIFSON, ALEXANDERTARAS, MICHAEL F.
Owner CARRIER CORP