A modular, cooling device for providing cool air to a body and/or an external environment comprises a first body portion combining a cooling medium and air passageways therethrough. The first body portion may be detached from second and third body portions and placed in a freezer to refreeze the cooling media, and reattached for further use. The second body portion may include a material that absorbs condensate that forms within the air passageways. The third body portion may include a fan for driving air into the cooling device, through the air passageways and out of the cooling device. When passing through the air passageways, a heat transfer is produced between the passing air and the cooling medium, cooling the passing air. The fan speed may be varied to adjust air flow.

A hybrid dehumidification system for controlling the humidity and/or both humidity and temperature in a space includes a cooling coil for first cooling, or cooling and reducing the humidity of, an airstream to be supplied to the space with an aqueous cooling medium, passing the thus cooled airstream through a desiccant adsorption means to further reduce the humidity of the airstream before supplying the airstream to the space, and regenerating the desiccant adsorption means by heating the desiccant with waste heat from a heat pump used to further cool the first aqueous cooling medium.

A dehumidification system includes a first dehumidification unit having an outdoor air cooling heat exchanger, a second dehumidification unit using two adsorption heat exchangers such that an air passage is switched, and a third dehumidification unit having an adsorption rotor. Low-temperature low-humidity air cooled and dehumidified in the second dehumidification unit is supplied to the third dehumidification unit to reduce energy for recovery of the third dehumidification unit and to realize energy conservation in the dehumidification system and reduction in cost of the dehumidification system.

A one-use air-reduction is herein detailed which is suitable for mounting in window slits or door gabs for use in discharging wet air from room dehumidification, without the one-use air-reduction preventing safety devices built into the window or door the one-use air-reduction is installed.

Systems and methods for controlling conditions in an enclosed space, such as a data center, or for providing cooling to a device, can include using a Liquid-to-Air Membrane Energy Exchanger (LAMEE) as an evaporative cooler. The LAMEE or exchanger can cool water to the outdoor air wet bulb temperature in a cooling system disposed outside of the enclosed space or device. The reduced-temperature water can be delivered to the enclosed space or device or can cool a coolant that is delivered to the enclosed space or device. The air in the enclosed space, or one or more components in the enclosed space, can be cooled by delivering the reduced-temperature water or coolant to the enclosed space, rather than moving the supply air from the enclosed space to the cooling system. In an example, the cooling system can include one or more cooling coils, upstream or downstream of the LAMEE.