Abstract: A portable subcooling apparatus includes a housing within which is enclosed a compressor for pressurizing cooling refrigerant and a condenser in fluid communication with the compressor for removing heat from the cooling refrigerant, and a heat exchanging evaporator coil for absorbing heat from a recovery refrigerant, the evaporator coil comprising first, second and third heat absorption coils and first and second heat transfer coils where the third heat absorption coil is concentrically nested within the first heat transfer coil, the first heat transfer coil is concentrically nested within the second heat absorption coil, the second heat absorption coil is concentrically nested within the second heat transfer coil, and the second heat transfer coil is concentrically nested within the first heat absorption coil.

Abstract: An autorotating unmanned aerial vehicle (UAV) has a data acquisition system and a rotor assembly including a hub that couples the rotor assembly to the UAV. Although not limited thereto, the UAV is suitable for collecting data about the inside of a cavity. The data acquisition system includes a processor and one or more sensors that obtain data about motion of the UAV and at least one parameter of the cavity as the UAV descends though the cavity. Features of the cavity may be mapped by generating a 3D point cloud from the data. The cavity may be natural or man-made, such as a mine.

Abstract: An autorotating unmanned aerial vehicle (UAV) has a data acquisition system and a rotor assembly including a hub that couples the rotor assembly to the UAV. Although not limited thereto, the UAV is suitable for collecting data about the inside of a cavity. The data acquisition system includes a processor and one or more sensors that obtain data about motion of the UAV and at least one parameter of the cavity as the UAV descends though the cavity. Features of the cavity may be mapped by generating a 3D point cloud from the data. The cavity may be natural or man-made, such as a mine.