Transport refrigeration system and methods for same to address dynamic conditions
AssigneeCarrier Corporation
InventorsRaymond L. Senf, JR., John R. Reason
Life of this patent
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Abstract
In a refrigeration system having a compressor, a heat rejection heat exchanger, a heat absorption heat exchanger, and a controller for controlling the same, embodiments of a system, apparatus and methods for the same can control at least one refrigeration system component such as an expansion valve responsive to dynamic system conditions.
Claims19
In a transport refrigeration unit having a compressor, a condenser, an evaporator, an economizer, a second expansion valve coupled between the economizer and the compressor, and a controller, and a first expansion valve upstream of the evaporator, a process comprising:
- detecting a capacity increase mode transition for the economizer;
- and
- adaptively controlling an injection flow rate for the economizer during at least a portion of the capacity increase mode transition in response to one of available pressure, available power or available current to the transport refrigeration unit.
A computer program product comprising a computer usable storage medium to store a computer readable program that, when executed on a computer, causes the computer to perform operations to operate a transport refrigeration unit, the operations comprising:
- operate the transport refrigeration unit in a first mode;
- control an economizer to transition the transport refrigeration unit to a higher capacity mode;
- and
- increase gradually a gas flow rate from the economizer to over a prescribed time at said transition.
A refrigerant system comprising:
- a compressor, a condenser downstream of the compressor, an expansion device downstream of the condenser, and an evaporator downstream of the expansion device, and a refrigerant circulating from the compressor to the condenser, through the expansion device and the evaporator and then returning to the compressor;
- and
- a control module to control a system component to maintain a constant mass flow rate across a varying differential pressure change.
Dependencies are inferred from the claim text.