Stage transition in transcritical refrigerant vapor compression system
a technology of refrigerant vapor and stage transition, which is applied in the direction of lighting and heating equipment, process and machine control, instruments, etc., can solve the problems of undesirable repeated overshoot and undershoot, and the temperature within the temperature controlled space will drop below the narrow temperature, so as to preserve the temperature control sensitivity and low capacity operation
Inactive Publication Date: 2015-10-22
CARRIER CORP
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Benefits of technology
The patent describes a way to control a refrigerant vapor compression system in a way that prevents over-heating or too much cooling of the space being conditioned. The method involves controlling the operation of the air moving device and the heating device in the system in a way that preserves the sensitivity of the motor that drives the compression device. This allows for precise temperature control during low capacity operation of the system.
Problems solved by technology
If the refrigerant vapor compression system outputs too much cooling capacity, the temperature within the temperature controlled space will drop below the narrow temperature.
However, doing so can result in undesirable repeated overshoot and undershoot of the narrow temperature band bounding the control temperature set point.
Method used
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[0018]There is depicted in FIG. 1 an exemplary embodiment of a refrigerated container 10 having a temperature controlled cargo space 12 the atmosphere of which is refrigerated by operation of a transport refrigeration unit 14 associated with the cargo space 12. In the depicted embodiment of the refrigerated container 10, the transport refrigeration unit 14 is mounted in a wall of the refrigerated container 10, typically in the front wall 18 in conventional practice. However, the refrigeration unit 14 may be mounted in the roof, floor or other walls of the refrigerated container 10. Additionally, the refrigerated container 10 has at least one access door 16 through which perishable goods, such as, for example, fresh or frozen food products, may be loaded into and removed from the cargo space 12 of the refrigerated container 10.
[0019]Referring now to FIG. 2, there is depicted schematically an embodiment of a refrigerant vapor compression system 20 suitable for use in the transport ref...
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Operation of a transcritical refrigerant vapor compression system for supplying temperature conditioned air to a temperature controlled space is controlled when staging up or staging down to avoid undesirable overshoot and undershoot of the narrow temperature band bounding the control temperature set point for the temperature within the temperature controlled space.
Description
BACKGROUND OF THE DISCLOSURE[0001]This disclosure relates generally to refrigerant vapor compression systems and, more particularly, to improving the energy efficiency and / or low cooling capacity operation of a transcritical refrigerant vapor compression system.[0002]Refrigerant vapor compression systems used in connection with transport refrigeration systems are generally subject to more stringent operating conditions due to the wide range of operating load conditions and the wide range of outdoor ambient conditions over which the refrigerant vapor compression system must operate to maintain product within the cargo space at a desired temperature. The desired temperature at which the cargo needs to be controlled can also vary over a wide range depending on the nature of cargo to be preserved. The refrigerant vapor compression system must not only have sufficient capacity to rapidly pull down the temperature of product loaded into the cargo space at ambient temperature, but also sho...
Claims
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IPC IPC(8): F25B49/02
CPCF25B49/02F25B1/10F25B49/022F25B2309/061F25B2400/13F25B2600/0253F25B2600/111F25B2600/2509B60H1/3228Y02B30/70
InventorSUN, JIANSHAPIRO, ARYNLIU, LUCY YIGAN, MINGFEI
OwnerCARRIER CORP