摘要:
A combined solar concentrator and radiator assembly (10) is provided in a relatively lightweight and compact geometry adapted particularly for use in electrical power generation systems in space. The solar concentrator - radiator assembly comprises a solar reflector of the Cassegrain type having primary and secondary reflelctor surfaces (14) and (26) for concentrating incident solar ration upon a thermal powered generator unit (16). The primary reflector surface (14) is formed on one side of an array of interleaved panels (30) adapted for movement between a compact stowed profile to fit within the cargo bay of a transport vehicle, and an extended deployed configuration. The reverse sides of these panels define a space radiator of extended surface area connected to the generator unit (16) by heat transfer members such as heat pipes (34) for purposes of dissipating excess heat to the surrounding space environment.
摘要:
Solar heat is transferred to water by a relatively volatile liquid that flows in closed circuit. The water is thermally insulated from the sunlight. The volatile liquid is drawn by a thermosiphon effect through passageways exposed to the sunlight, and then through passageways shielded from the sunlight but in the same chamber as the passageways exposed to the sunlight, before proceeding to indirect heat exchange with the water and back to the reservoir of volatile liquid. A siphon loop in that shielded portion of the path, ensures that when there is no sunlight, the condensation in the conduits that were previously exposed to the sunlight will not cause reverse flow in the circuit.
摘要:
A solar collector having a copper panel in a contiguous space relationship with a condenser-evaporator heat exchanger located under the panel, the panel having a honeycomb-like structure on its interior defining individual cells which are filled with zeolite loaded, in its adsorbed condition, with 18 to 20% by weight of water. The interior of the panel and heat exchanger are maintained at subatmospheric pressure of about 0.1 to 1 psia. The panel and heat exchanger are insulated on their lateral sides and bottoms and on the top of the heat exchange. The panel has a black coating on its top which is exposed to and absorbs solar energy. Surrounding the insulation (which supports the panel) is an extruded aluminum framework which supports a pair of spaced-apart glass panels above the solar panel. Water in conduits from a system for heating or cooling or both is connected to flow into an inlet and discharge from outlet of a finned coil received within the heat exchanger. The collector panel provides heat during the day through desorption and condensing of water vapor from the heated solar panel in the heat exchanger and cools at night by the re-adsorption of the water vapor from the heat exchanger which lowers the absolute pressure within the system and cools the heat exchange coils by evaporation.
摘要:
A heat collector and method suitable for efficiently and cheaply collecting solar and other thermal energy are provided. The collector employs a heat pipe in a gravity-assist mode and is not evacuated. The collector has many advantages, some of which include ease of assembly, reduced structural stresses on the heat pipe enclosure, and a low total materials cost requirement. Natural convective forces drive the collector, which after startup operates entirely passively due in part to differences in molecular weights of gaseous components within the collector.
摘要:
There is provided a solar collector comprising a metal heat pipe having an evaporator section and a condenser section. A metal tube is spaced from and surrounds the evaporator section, one end of such metal tube being closed and the other end being open. A metal solar heat absorber plate is thermally conductively connected to the metal tube. An evacuated transparent glass envelope is spaced from and surrounds the metal tube and the absorber plate connected thereto, such envelope being joined to the open end of the metal tube by means of a glass-metal seal. A thermally conductive medium fills the space between the metal tube and the evaporator section of the heat pipe.
摘要:
A self-contained passive solar heating system includes first and second heat pipes, each having a refrigerant medium therein, a condenser portion and an evaporator portion, with the condenser portion of the first heat pipe being coupled to the evaporator portion of the second heat pipe for transferring heat thereto when the pressure within the first heat pipe is greater than the pressure within the second heat pipe. The evaporator portion of the first heat pipe is adapted to be exposed to a source of heat and the condenser portion of the second heat pipe contacts a medium to be heated. A temperature control mechanism may be installed as the coupling between the first and second heat pipes for uncoupling the same when the temperature within the first heat pipe falls below a predetermined temperature. Also, a third heat pipe may be provided having a thermostatic portion operatively connected to the condenser portion of the second heat pipe by a piston means so that changes in pressure within the thermostatic portion occasioned by changes in temperature of the medium to be heated will cause movement of the pistons to vary the size of the condensing portion of the second heat pipe to increase or decrease the rate of heat transfer to the medium.
摘要:
An energy collector and transferring apparatus which in its first embodiment utilizes three connected closed loop conduit systems. The first closed loop conduit system is to include an energy collector which is to collect not only solar energy but ambient energy. The energy is absorbed within a black liquid flowing through the first conduit system. The first conduit system includes a first energy exchanger wherein the absorbed energy is transferred from black liquid to a second energy absorbing medium. The second energy absorbing medium is cycled within a second closed loop conduit system. A compressor is included within the second closed loop conduit system to condense this medium from a gaseous state to a higher density fluid, thereby substantially raising the temperature. The energy from the second energy absorbing medium is then to be absorbed through an energy exchanger to a third energy absorbing medium of a third closed loop conduit system. In a second embodiment of the present invention, the first and third closed loop conduit systems are combined into a single closed loop conduit system with the second closed loop conduit system functioning to additively supply energy to the single closed loop conduit system.
摘要:
There is provided a solar collector comprising an absorber, a getter, and a heating element arranged within an evacuated transparent envelope, the heating element being positioned separate and apart from the getter. Associated with the envelope is means to heat the heating element to a temperature of 500.degree. to 2000.degree. C. in order to crack any hydrocarbons formed from gaseous contaminants released by the envelope and the absorber during operation.
摘要:
Disclosed are apparatus and method for heating water by reflux condensation wherein a solar vaporized heat transfer fluid passes through a condenser in heat exchange relationship with a volume of water. The collection of solar radiation is effected in a primary solar collection region elevated above the condenser. The invention disclosed provides for the recirculation of condensed heat transfer fluid from condenser to the primary collection region. Sequentially, this entails passing condensate by gravity from the condenser into a U-type trap for accumulation until excess condensate causes some spill-over and flow by gravity of condensate into a booster solar collection region, through a venturi. In the booster regin spill over condensate flash vaporizes and is channeled in reverse through the venturi. The velocity of the vapor in the venturi creates low pressure according to the venturi effect, thereby drawing condensate accumulated in the trap into the venturi. Condensate so drawn into the venturi is lifted upward by the booster generated vapor into the primary collector for distribution and re-vaporization. This cycle will repeat intermittently like the percolation of water in a coffee pot.
摘要:
A solar heater adapted to be made as an integral, sealed unit for installation in a building exterior wall or for use in an existing window opening or the like. A collector is operative to transfer solar heat to an adjacent evaporator to heat and vaporize a liquid refrigerant. The refrigerant vapor rises naturally into a condenser disposed in intimate contact with a solid phase change material carried in a plurality of spaced containers. The refrigerant is condensed and flows by gravity back to the evaporator, giving up its heat of vaporization to the phase change material, resulting in melting of a portion of the material, and thereby storing heat. Air circulating past the containers receives heat from the material for heating the building interior during the night as well as the day. Stackable, nestable units are disclosed.