Abstract: An illustrative heat pump system includes: a positive displacement compressor, an expander, and a recuperator. The compressor provides an sCO2 flow with a pressure ?15 MPa at a temperature ?120° C. and a mass flow rate ?4.5 kg/s to deliver between 1 and 10 MWth of power to a thermal load. The recuperator receives an outlet flow from a thermal source such as a geothermal well thermosiphon and directs it as a compressor inlet flow to the compressor and receives a return flow from the thermal load and directs it to the expander while converting at least some residual heat in the return flow into additional heat for the compressor inlet flow. The expander converts at least some pressure of the return flow into power for the compressor, producing an inlet flow to the source with a pressure no higher than 5 MPa at a temperature no higher than 20° C.

Abstract: An illustrative heat pump system includes: a positive displacement compressor, an expander, and a recuperator. The compressor provides an sCO2 flow with a pressure ?15 MPa at a temperature ?120° C. and a mass flow rate ?4.5 kg/s to deliver between 1 and 10 MWth of power to a thermal load. The recuperator receives an outlet flow from a thermal source such as a geothermal well thermosiphon and directs it as a compressor inlet flow to the compressor and receives a return flow from the thermal load and directs it to the expander while converting at least some residual heat in the return flow into additional heat for the compressor inlet flow. The expander converts at least some pressure of the return flow into power for the compressor, producing an inlet flow to the source with a pressure no higher than 5 MPa at a temperature no higher than 20° C.

Abstract: A device for removing fluid from a body, the device comprising an array of microneedles and a housing; the array of microneedles being disposed within the housing and the housing defining a chamber. The microneedles are moveable between a disengaged position and an engaged position where, in use in the engaged position, the microneedles penetrate the surface of a body. The chamber is adapted to surround the surface of the body through which the microneedles penetrate when in the engaged position. The chamber is configured for connection to a vacuum device such that negative pressure can be applied to the chamber.

Abstract: A device for removing fluid from a body, the device comprising an array of microneedles and a housing; the array of microneedles being disposed within the housing and the housing defining a chamber. The microneedles are moveable between a disengaged position and an engaged position where, in use in the engaged position, the microneedles penetrate the surface of a body. The chamber is adapted to surround the surface of the body through which the microneedles penetrate when in the engaged position. The chamber is configured for connection to a vacuum device such that negative pressure can be applied to the chamber.

Abstract: A device for removing fluid from a body, the device comprising an array of microneedles and a housing; the array of microneedles being disposed within the housing and the housing defining a chamber. The microneedles are moveable between a disengaged position and an engaged position where, in use in the engaged position, the microneedles penetrate the surface of a body. The chamber is adapted to surround the surface of the body through which the microneedles penetrate when in the engaged position. The chamber is configured for connection to a vacuum device such that negative pressure can be applied to the chamber.