Methods and systems are provided for adjusting a position of an air recirculation valve of a HVAC system to adjust a ratio of ambient to recirculated air routed to an AC evaporator to collect condensed water for water injection into an engine. In one example, a method may include adjusting the position of the air recirculation valve of the HVAC system based on a water level in a water storage tank of the water injection system. Further, the method may include adjusting the position of the air recirculation valve of the HVAC system based on a determined humidity of the ambient air and a determined humidity of the recirculated air.

A heat exchanger for a vehicular air conditioning system is disclosed. The heat changer includes a heat exchanger body, a water storage tank, and a condensate water circulating device. The heat exchanger body is provided with an air-inlet side and an air-outlet side. The air-inlet side is configured to enable an external air flow to enter the heat exchanger body, so that the air flow conducts heat exchange with a refrigerant in the heat exchanger body. The air-outlet side is configured to exhaust the air flow completing heat exchange with the refrigerant. The water storage tank is arranged below the heat exchanger body and is configured to store condensate water formed on the heat exchanger body. The condensate water circulating device is configured to transport cold water in the water storage tank to the air-inlet side of the heat exchanger body for heat exchange with the heat exchanger body.

Disclosed is a transportation refrigeration system including a transportation refrigeration unit configured to maintain a temperature in a refrigerated cargo space and comprising a refrigerant expansion device, a refrigerant heat absorption heat exchanger, a refrigerant compression device, and a refrigerant heat rejection heat exchanger; and a refrigeration augmentation unit comprising a water tank having an outlet, and a water droplet generator in fluid communication with a water tank outlet and configured to disperse water droplets into an air stream flowing to the refrigerant heat rejection heat exchanger. Also disclosed are methods of using the transportation refrigeration system.

An air-conditioning and humidity control system for a mobility vehicle that includes a cold air generating part configured to cool air by allowing the air to exchange heat with a refrigerant, a warm air generating part configured to heat air by allowing the air to exchange heat with the refrigerant, a moisture capturing part configured to capture condensate water generated by the heat exchange in the cold air generating part, and a moisture providing part configured to selectively transfer the condensate water captured by the moisture capturing part to the warm air generating part.