Simultaneous vapor and liquid injection

A transport climate control system with simultaneous vapor and liquid injection, comprising:

• a compressor, a condenser, a sub-cooler, a receiver, an economizer having a vapor outlet and a liquid outlet, a controller, and a flow control device,
• wherein the receiver is disposed downstream of the condenser and upstream of the sub-cooler, the economizer is disposed downstream of the sub-cooler,
• the compressor includes a suction port, a vapor injection port connected to the vapor outlet of the economizer, and a liquid injection port separated from the vapor injection port,
• the controller is configured to control the flow control device to adjust an amount of liquid refrigerant into the liquid injection port to maintain a discharge temperature of the compressor at or below a threshold,
• the liquid injection port is connected to the liquid outlet of the economizer and is connected to an outlet of the receiver at a location upstream of the sub-cooler, and
• the flow control device is disposed directly downstream of the liquid outlet of the economizer, directly downstream of the outlet of the receiver, and directly upstream of the compressor.

A transport climate control system with simultaneous vapor and liquid injection, comprising:

• a compressor, a condenser, a sub-cooler, a receiver, an economizer having a vapor outlet and a liquid outlet, a controller, and a flow control device,
• wherein the receiver is disposed downstream of the condenser and upstream of the sub-cooler, the economizer is disposed downstream of the sub-cooler,
• the compressor includes a suction port, a vapor injection port connected to the vapor outlet of the economizer, and a liquid injection port separated from the vapor injection port,
• the controller is configured to control the flow control device to adjust an amount of liquid refrigerant into the liquid injection port to maintain a discharge temperature of the compressor at or below a threshold,
• the liquid injection port is connected to the liquid outlet of the economizer, is connected to an outlet of the sub-cooler at a location upstream of the economizer, and is connected to an outlet of the receiver at a location upstream of the sub-cooler, and
• the flow control device is disposed directly downstream of the liquid outlet of the economizer, directly downstream of the outlet of the sub-cooler, directly downstream of the outlet of the receiver, and directly upstream of the compressor.