Abstract: Technologies are described for a recirculating evaporative air conditioning system. A pre-cooling evaporator may be coupled to a pre-cooling compressor and a pre-cooling condenser by a first closed refrigerant loop. A post-cooling evaporator may be coupled to a post-cooling compressor and a post-cooling condenser by a second closed refrigerant loop. A blower can draw ambient air through the pre-cooling evaporator and then blow the air out through the post-cooling evaporator. A discharge plenum can collect the air blown out through the post-cooling evaporator. A recirculation duct can recirculate a portion of the air collected at the discharge plenum back into the pre-cooling evaporator, into the post-cooling evaporator, or into any ducts or plenums associated therewith. A discharge duct can conduct a portion of the air collected at the discharge plenum into an aircraft, electrical equipment, an aircraft ground power unit, a passenger bridge, or other such aircraft ground support systems.

Abstract: A modular and compact air conditioning system is designed to be conveyed by a ground support equipment cart and to occupy minimal space within the cart. The system is constructed within a rectangular frame supporting top, bottom, left side, right side, front side, and back side panels. The top and back side panels contain thin air conditioner condensers. One of the left and right side panels contain an air outlet, and the other contains an air inlet and a duct that may be connected to an airplane to provide cooling air to the airplane. A condenser fan is mounted within the rectangular frame and is arranged to draw outside air in through the condensers and to blow the air out through the air outlet.

Abstract: A modular and compact air conditioning system is designed to be conveyed by a ground support equipment cart and to occupy minimal space within the cart. The system is constructed within a rectangular frame supporting top, bottom, left side, right side, front side, and back side panels. The top and back side panels contain thin air conditioner condensers. One of the left and right side panels contain an air outlet, and the other contains an air inlet and a duct that may be connected to an airplane to provide cooling air to the airplane. A condenser fan is mounted within the rectangular frame and is arranged to draw outside air in through the condensers and to blow the air out through the air outlet.

Abstract: A frame, panel, and fastener system for use in constructing modules that are to be installed on a ground support equipment cart. The modules have a rectangular frame that is constructed primarily by connecting together members constructed as folded sheet metal tubes substantially rectangular in cross section but, on two adjoining sides, bent perpendicularly outwards to form a first shelf perforated with fastener mounting holes, these frame members having ends that may be fastened to pairs of ends of other like frame members at perpendicular angles to form the corners of the rectangular frame and of the modules. Panels having edges bent over to form stand-offs and perforated with fastener mounting holes are sized so the stand-offs rest upon the first shelves on plural sides of the rectangular frame.

Abstract: A fastener system for use in removably attaching cover panels to openings in the sides of modules containing equipment on airplane ground support equipment carts, where the fasteners must not come loose to damage airplane engines. At least some modules have a metallic frame defining at least one opening providing access to the module's interior. This frame supports an inwardly recessed shelf around the inside perimeter of the opening. At least one cover panel is sized to fit removably within the opening. The shelf and the panel have aligned holes for fasteners, and the edges of the panel are bent inwards to form standoffs from the shelf.