Transport refrigeration unit with heat island mitigation

A transportation refrigeration system comprising:

• a transportation refrigeration unit configured to maintain a temperature in a refrigerated cargo space and comprising a refrigerant expansion device, refrigerant heat absorption heat exchanger, a refrigerant compression device, and a refrigerant heat rejection heat exchanger;
• a refrigeration augmentation unit comprising a water tank having an inlet, an outlet, a water droplet generator in fluid communication with the water tank outlet and configured to disperse water droplets into an air stream flowing to the refrigerant heat rejection heat exchanger;
• and
• a controller which controls the operation of the refrigeration augmentation unit based on ambient conditions and transportation refrigeration system conditions to disperse water droplets in a quantity and size that will result in evaporation of greater than or equal to 75% of the water droplets evaporate before contact with the refrigerant heat rejection heat exchanger.

A method of cooling a refrigerated cargo space comprising:

• cycling a transportation refrigeration system having a fuel cell, a controller, and a refrigeration augmentation unit on and off for a number of times without using the refrigeration augmentation unit, wherein the number of times the transportation refrigeration system is cycled on and off is based at least in part on a size of the fuel cell;
• and
• collecting water from the fuel cell during the cycling of the transportation refrigeration system without using the refrigeration augmentation unit;
• and
• cycling the transportation refrigeration system using the refrigeration augmentation unit, wherein water used by the refrigeration augmentation unit comprises the collected water.