Cabin air temperature control with cooling of recirculated air

A passenger cabin air temperature control system, comprising:

• a first air circuit having an intake portion that receives air from outside of the passenger cabin and an outlet portion through which air is supplied into the passenger cabin;
• at least one air conditioning assembly in the first air circuit that is operative to adjust a temperature of the air received into the intake portion before it is supplied to the passenger cabin through the outlet portion;
• a second air circuit that recirculates non-compressed air from within the cabin back into the cabin;
• and
• an air cooling heat exchanger in the second air circuit that is operative to selectively cool the non-compressed air received from within the cabin before the air is reintroduced into the cabin;
• wherein the air cooling heat exchanger is supported in a housing of an air cycle machine through which the outside air flows and the air conditioning assembly includes at least one first circuit heat exchanger supported in the air cycle machine housing and wherein the air cooling heat exchanger is upstream of the first circuit heat exchanger relative to the outside air flow.

A passenger cabin air temperature control system, comprising:

• a first air circuit having an intake portion that receives air from outside of the passenger cabin and an outlet portion through which air is supplied into the passenger cabin;
• at least one air conditioning assembly in the first air circuit that is operative to adjust a temperature of the air received into the intake portion before it is supplied to the passenger cabin through the outlet portion;
• a second air circuit that recirculates non-compressed air from within the cabin back into the cabin;
• an air cooling heat exchanger in the second air circuit that is operative to selectively cool the non-compressed air received from within the cabin before the air is reintroduced into the cabin;
• and
• the air conditioning assembly includes at least one first circuit heat exchanger and including a flow passage between the first circuit heat exchanger and the air cooling heat exchanger that selectively permits some of the air cooled by the first circuit heat exchanger to be subsequently further cooled by the air cooling heat exchanger before the air cooled by the first circuit heat exchanger is introduced to the passenger cabin.