Abstract: In a solar radiation collector composed of a mat formed of a black foil member and a radiation pervious foil member, the two members being connected together along the outer edges of the mat and at interior locations of the mat to form an inlet and outlet and an extended flow path for a fluid heat carrier medium between the inlet and outlet, the collector further including a cover connected to the mat along opposed edges thereof and arranged to be disposed in the path of solar radiation toward the mat with an air space being defined between the mat and the cover, with the connections at interior locations of the mat serving to form parallel flow channels defining portions of the flow path and extending parallel to the opposed edges of the mat along which the cover is connected such that the dimension of the mat between the opposed edges at which the cover is connected has a first value when the mat does not contain heat carrier medium and is in a flattened state and a second value less than the first value wh

Abstract: In a solar radiation collector composed of a mat formed of a black foil member and a radiation pervious foil member, the two members being joined together along the outer edges of the mat and at interior locations of the mat to form an extended flow path and an inlet and outlet for a fluid heat carrier medium, the collector further including a cover connected to the mat along opposed edges thereof and arranged to be disposed in the path of solar radiation toward the mat with an air space being defined between the mat and the cover, with the cover being formed to define a flexible support for holding at least one radiation pervious pane and at least one reflecting panel in relative positions such that the pane, the panel and the mat constitute the legs of a triangle enclosing the air space.

Abstract: A heat pump arrangement includes an evaporator, a first condenser and a compressor connected in a circuit containing a heat-carrying medium. The compressor is arranged downstream of the evaporator and the first condenser is arranged downstream of the compressor as viewed in the direction of the flow of the medium, whereby the compressor receives medium in the vapor phase from the evaporator and delivers medium in the liquid phase to the evaporator through the first condenser. The heat pump arrangement further has an expander, a second condenser connected downstream of the expander and a pump arranged between the output of the second condenser and the evaporator.

Abstract: A heat exchanger for use with two media, one of which is to be heated up and the other of which is to be cooled down. The heat exchanger has an inlet and an outlet for the medium which is to be cooled down, as well as a plurality of parallel conduits which are connected between the inlet and outlet so that the medium flows through the conduits as it passes through the heat exchanger. The conduits are connected to each other such that the medium changes its direction of flow by 180.degree. at least once between the point where it enters the heat exchanger through the inlet and the point where it leaves the heat exchanger through the outlet.

Abstract: A mat-shaped solar heater having multiple parallel flow channels for a heat-carrying medium. Any two adjacent ones of the flow channels have a common linear divider and at least some of the dividers terminate short of an edge of the heater. Inlet and outlet conduits communicate with the interior of the heater for allowing the medium to be introduced into and to flow out of the flow channels. Discharge conduits are provided which communicate with the interior of the heater in the region of the edge in question. When the discharge conduits are closed, the inlet and outlet conduits form the sole communication between the interior and exterior of the heater, whereas when the discharge conduits are open, the medium may flow through these discharge conduits, thereby facilitating the removal of heat-carrying medium from the interior of the heater.

Abstract: Apparatus for producing useful heat from solar radiation and which in the operating position is oriented in an inclined plane. The apparatus includes a coilable conduit structure which is provided with an inlet and an outlet for a flowable heat carrier medium and is formed of two elongated flexible foils, with one being colored so as to absorb solar radiation, which are sealingly connected together along their edge regions and are sealingly connected together along lines in their center regions to form a plurality of parallel flow channels which extend along the longitudinal axis of the foils, and first and second transverse flow channels which connect the respective adjacent ends of said parallel flow channels together.

Abstract: An inlet and/or outlet manifold arrangement for use with a conduit system of a solar radiation collector. The arrangement has inlet and outlet manifolds which are held in a given position and which are connected to the conduit system, there being an inlet communicating with the inlet manifold and an outlet communicating with the outlet manifold. At least the inlet manifold is equipped with a riser having a height such that when the pressure in the conduit system exceeds a predetermined value, the riser serves as an overflow which allows liquid to escape from the inlet manifold and to flow into the outlet manifold.

Abstract: A vapor engine using a refrigerant as its working medium and having a number of bellows each forming an expansion chamber which receives the working medium and changing its volume under the influence of the pressure exerted by the vaporized working medium. A crank shaft is arranged above and is mechanically connected to each of the bellows, and a rotary slide is provided below the bellows for controlling the flow of the working medium to and from the bellows.

Abstract: Device for producing usable heat from solar radiation comprising a carrier which is in heat conductive contact with a flowable heat carrier medium in a flexible conduit structure which has an inlet and an outlet and is on a surface of the carrier. The carrier is formed of a flexible material whereby the device including the conduit and the carrier is coilable into a roll.

Abstract: A sound-damping housing suitable for use with a piece of sound-generating equipment. The housing has inner and outer housing parts, the former forming a chamber for receiving the piece of sound-generating equipment, with the two housing parts forming between themselves a second chamber for receiving a sound-damping liquid. This second chamber surrounds the receiving chamber, and suitable provision is made for allowing the piece of sound-generating equipment to be inserted into and withdrawn from the receiving chamber. By virtue of this arrangement, the sound-damping housing and the piece of sound-generating equipment may be transported separately from each other. Moreover, the liquid need not be introduced into the sound-damping housing until after the same has been transported to the place where it is to be installed, thus making it easier for the sound-damping housing to be transported.