Abstract: A control system and method for controlling an indoor heating system for an indoor environment of a building in accordance with a desired indoor temperature, comprising a sensor (18) for detecting an outdoor temperature, a sensor (17) for detecting a in return temperature T.sub.return of a heat carrying medium circulated in a heat distribution system with a flow rate, and a controller (13). The controller is adapted to determine a required heating power P.sub.req to be delivered by the heat distribution system to maintain a heating power balance according to P.sub.req=P.sub.loss-P.sub.source, where P.sub.loss is an approximation of heating power losses from the building, and includes a dynamic approximation of heating power transfer through walls of the building, based on at least the desired indoor temperature, the detected outdoor temperature, a heat transfer coefficient of the wall, and a heat capacity of the wall, and P.sub.

Abstract: A control system and method for controlling an indoor heating system for an indoor environment in accordance with a desired indoor temperature, comprising a sensor (18) for detecting an outdoor temperature, a sensor (17) for detecting a in return temperature Treturn of a heat carrying medium circulated in a heat distribution system with a flow rate, and a controller (13).

Abstract: Process and device for controlling the temperature of an outbound secondary flow in a secondary circuit from a heat exchanger by a primary flow in a primary circuit, via a member that regulates the primary flow, influenced by a control unit. The enthalpy difference between inbound and outbound primary flow to and from the heat exchanger and the secondary flow are determined. The flow in the primary circuit is determined, and the parameters are supplied to the control unit for controlling the member, whereby the primary flow is controlled in dependence of the secondary flow, so that power supplied to the heat exchanger substantially equals the sum of the power needed to raise the temperature of the secondary flow from the initial temperature to the desired outbound temperature; the assumed power requirement for compensating for energy stored in the heat exchanger; and the assumed leak power from the heat exchanger.

Abstract: Process and device for controlling the temperature of an outbound secondary flow in a secondary circuit from a heat exchanger by a primary flow in a primary circuit, via a member that regulates the primary flow, influenced by a control unit. The enthalpy difference between inbound and outbound primary flow to and from the heat exchanger and the secondary flow are determined. The flow in the primary circuit is determined, and the parameters are supplied to the control unit for controlling the member, whereby the primary flow is controlled in dependence of the secondary flow, so that power supplied to the heat exchanger substantially equals the sum of the power needed to raise the temperature of the secondary flow from the initial temperature to the desired outbound temperature; the assumed power requirement for compensating for energy stored in the heat exchanger; and the assumed leak power from the heat exchanger.

Abstract: The aerial refueling drogue utilizes a bleeding drogue canopy providing substantially constant loads over a range of refueling speeds, by passive movement of the bleeding drogue between a retracted position and and extended position. The passive variable speed drogue comprises leading edge support arms, center support arms, and trailing edge support arms mounted to a refueling coupling member, with a forward drogue canopy attached between the leading edge support arms and the center support arms. An aft bleeding drogue canopy is connected between the center support arms and the trailing edge support arms. Springs in the trailing edge support arms bias the bleeding drogue canopy to a retracted position. In an alternate embodiment, cords are attached to the trailing edge of the aft bleeding drogue canopy, continue through the trailing edge support arms, up each center support arm, and through rings attached to the inside of the aft bleeding drogue canopy.

Abstract: The variable speed drogue for use with an inflight aerial refueling system includes a refueling coupling for receiving a refueling probe. A plurality of trailing edge support arms are pivotally mounted to the trailing edge portion of the refueling coupling, projecting rearwardly, a plurality of pivot linkage members are pivotally connected to the trailing edge portion of the refueling coupling, and a plurality of leading edge support arms are pivotally connected to the pivot linkages. A mechanism is also provided for uniformly and symmetrically longitudinally changing the pivot points of the leading edge support arms to change the projected area of the drogue canopy.