A solid-state passive evaporative cooling system includes a hydrogel body, a water supply channel, a hydrogel root, and a water supply device. One end of the water supply channel is embedded into the hydrogel body, and a plurality of water outlets are formed in an outer wall of the water supply channel embedded into the hydrogel body. A water inlet at the other end of the water supply channel is connected to the water supply device which is configured to pump an aqueous solution into the water supply channel. The hydrogel root is disposed within the water supply channel. The aqueous solution is solidified by the hydrogel body to achieve the water-saving effect. During evaporative cooling, an osmotic pressure may be spontaneously created or enhanced within the system. The water supply channel is capable of adjusting the water content of the hydrogel body and providing a water supply driving force.

A solar adiabatic cooling vest. The cooling vest utilizes adiabatic evaporation to cool hot, dry air. Hot outside humid air is drawn by an exhaust fan through an air inlet over large particles of salt to lower the air humidity before passing through a wetted wick material. Heat in the air evaporates water in the wetted wick material, thus causing the air leaving the wick material to be saturated and at a lower temperature than the incoming air. The saturated air passes through a salt filter to lower the air's relative humidity. After exiting the salt filter, the cooled, drier air passes through an air filter to further lower its humidity and remove any salt particles from the air. The cooled air is then distributed through flexible outlet cooling tubes to a person's body, room, or enclosed space.

A solar adiabatic cooling vest. The cooling vest utilizes adiabatic evaporation to cool hot, dry air. Hot outside humid air is drawn by an exhaust fan through an air inlet over large particles of salt to lower the air humidity before passing through a wetted wick material. Heat in the air evaporates water in the wetted wick material, thus causing the air leaving the wick material to be saturated and at a lower temperature than the incoming air. The saturated air passes through a salt filter to lower the air's relative humidity. After exiting the salt filter, the cooled, drier air passes through an air filter to further lower its humidity and remove any salt particles from the air. The cooled air is then distributed through flexible outlet cooling tubes to a person's body, room, or enclosed space.

A method and a device for freezing the ground are provided with a freeze pipe closed on one front side, and an inner pipe extending into the freeze pipe for supplying a cooling agent, and wherein a hollow body is provided, whose inner diameter is larger than the outer diameter of the freeze pipe.

Aspects of the present invention relate to a textile fiber, thread or yarn. The fiber, thread or yarn is generally for production into a fabric. Alternative aspects are described for achieving a cooling effect, energy harvesting, heating, energy generation, energy emission, and others.

Aspects of the present invention relate to a textile fiber, thread or yarn. The fiber, thread or yarn is generally for production into a fabric. Alternative aspects are described for achieving a cooling effect, energy harvesting, heating, energy generation, energy emission, and others.

An assembly for cooling a liquid inside a portable container. According to some implementations the portable container has a heat exchanger assembly disposed therein with the heat exchanger assembly including a coolant pre-cooling assembly. According to the same or other implementations a tortuous coolant fluid passage that runs through at least a portion of the heat exchanger assembly includes one or more constrictions for controlling the evaporation temperature of the coolant along the length of the passage.

A method for managing the operation of a refrigerated truck for transporting heat-sensitive products, of the indirect-injection type, in which the parameter T=.sub.Tair inletT.sub.setpoint(T.sub.air inlet: temperature of the air coming into contact with the heat exchanger internal to the truck as a result of the action of the fan, T.sub.setpoint: temperature to be set in the chamber inside the truck) is determined in real time and in which if T is greater than an upper setpoint value T.sub.setpoint H, a rapid-pressurization (RMP) circuit is activated to vaporize some cryogen and thus increase the pressure in the head of gas above the reserve of cryogen of the truck.

A method for managing the operation of a refrigerated truck for transporting heat-sensitive products, of the indirect-injection type, in which the parameter T=.sub.Tair inletT.sub.setpoint(T.sub.air inlet: temperature of the air coming into contact with the heat exchanger internal to the truck as a result of the action of the fan, T.sub.setpoint: temperature to be set in the chamber inside the truck) is determined in real time and in which if T is greater than an upper setpoint value T.sub.setpoint H, a rapid-pressurization (RMP) circuit is activated to vaporize some cryogen and thus increase the pressure in the head of gas above the reserve of cryogen of the truck.

A semi-passive cooling system for a component exposed to a fluid flow utilizes a hierarchical vasculature and a sacrificial transpirant to cool the component. The component includes a body that defines a transpirant reservoir and the hierarchical vasculature. The transpirant is configured to transition between a solid phase and a vapor phase over an operating temperature range of the component.