164results about "Heat transfer optimization" patented technology

The invention discloses a high-efficiency solar phase-change heat-accumulation heat-collection wall system, which belongs to the technical field of a heat-accumulation heat-collection building utilizing solar energy. A phase-change material plate is attached to the surface of the wall body of a building in a passage of the solar heat-collection heat-accumulation wall, various vortex generators are arranged at the surface of the phase-change material plate at a certain attack angle of incident flow by an array mode, and vortex is induced to thin and destroy a boundary layer clinging to the wall surface or increase the turbulence intensity so as to reinforce the heat exchange of air at the surface and the phase-change material plate and enhance the heat-accumulation/heat-release rate of the phase-change material, thereby enhancing the efficacy of the solar phase-change heat-accumulation heat-collection wall system. Openings at the top end and the bottom of the passage are respectively communicated with a room of the building and an outdoor space, different operation strategies are respectively adopted in winter and summer, and heat is supplied to an indoor space in winter; and hot air in the passage is exhausted in summer, and the comfort level of the indoor space is enhanced. The solar heat-collection heat-accumulation wall has the characteristics of simple manufacture and convenient installation and has extensive application prospect and popularization value in a solar building.

A temperature fluctuation suppressing device for a heating medium is provided which is capable of sufficiently suppressing temperature fluctuations of the heating medium at the time of supplying collected solar heat for steam generation. The temperature fluctuation suppressing device includes a heating medium mixer provided on a heating medium supply passage configured to supply a liquid heating medium to a heat exchanging device, the heating medium mixer including: a heating medium passage forming member having plural heating medium passages; an inlet member and an outlet member provided separately from the inlet member, whereby the heating medium continuously flowing into the heating medium passage forming member through the inlet member passes through the plural heating medium passages with time-lags to form respective streams, which are then joined together before flowing out through the outlet member.

The invention discloses a glass tube bundle and porous medium composite structure solar absorber which comprises a solar absorber shell, wherein a quartz glass window is formed in one end of the solar absorber shell, and a medium outlet is formed in the other end of the solar absorber shell; the solar absorber shell and the quartz glass window are connected into a whole, and a cavity is formed between the solar absorber shell and the quartz glass window; glass tube bundles and porous media are sequentially arranged inside the cavity along the solar incident direction; a preheating channel is formed among the solar absorber shell, the glass tube bundles and the porous media; a first medium inlet is formed in one end of the preheating channel; and after preheated in the preheating channel, the media converge sunlight at the second medium inlet so as to enter the glass tube bundles. Because the glass tube bundles are small in solar absorption and small in external radiation energy, the thermal efficiency of the system is improved. Meanwhile, the incident sunlight is transmitted to the porous medium by the glass tube bundles, so that medium distribution is matched with sunlight flow density, while the porous medium is mainly capable of converting solar radiation energy into internal energy of working media; and therefore, the problem that the existing porous medium solar absorber is low in thermal efficiency and reliability is effectively solved.

An absorber for a solar receiver with a casing of lengthways axis including at a first lengthways end, a collector to supply a heat transfer fluid; and at a second lengthways end, a collector for evacuating the heat transfer fluid. The casing includes a first wall having a face intended to be subjected to a luminous flux, a second wall facing the first wall, and side walls connecting said the first and second walls. The casing is formed by at least one rib extending lengthways, and attached to the first and to the second wall. The at least one rib includes windows, and deflectors associated with the windows. The deflectors cause a portion of the heat transfer fluid to flow through the windows, causing reblending of the heat transfer fluid.

A device for transferring heat between a panel heated by solar radiation and a wall surface, including an insulating plate mounted parallel between the panel and the wall surface, to define a closed external space between the panel and the insulating plate, and a closed internal space between the insulating plate and the wall. An air circulator is interposed between the external space and the internal space and can be put selectively in an open state allowing circulation of air between the external space and the internal space, and thus allowing thermal transfer between the panel and the wall, and a closed state preventing circulation of air between the external space and the internal space, and thus preventing thermal transfer between the panel and the wall.

The invention concerns a heat transfer device comprising an insulating module (12) designed to be inserted between a first wall (14) and a second wall (16) to define a closed loop wherein flows a heating medium (FC) which comprises a first channel (28) extending substantially vertically along the first wall (14) and a second channel (30) extending substantially vertically along the second wall (16), the first channel and the second channel being mutually offset in the vertical direction to define a low channel and a high channel, as well as an upper channel (32) and a lower channel (34) linking the first channel and the second channel, such that heating medium (FC) flows freely or is blocked naturally in the loop when on the basis of the respective temperatures of the high channel and the low channel. The invention is particularly useful for heating or cooling buildings.

A solar collector comprising an array of solar cells, each of which is spaced-apart from a subset of solar cells adjacent thereto, defining a hiatus therebetween; a first substrate disposed to cover the array of solar cells; and a second substrate disposed to cover the array of solar cells, with the array begin position between the first and second substrates, with a plurality of throughways, each of which extends from an aperture in the first substrate, traversing the hiatus and terminating in an opening in the second substrate.

A solar thermal receiver with concentric tube modules is disclosed. The outer two tubes (101, 102) of each module form an annular gap (104) for the inlet flow (109) of a heat transfer fluid (HTF). A third inner tube (103) allows for the outlet flow (108) of the HTF. Each of the concentric tube modules is bottom-supported so as to allow for thermal expansion. Embodiments may include a structural element (750) to mitigate oscillation of the concentric tube modules and/or a top-mounted bell-shaped cap (534).

Disclosed is a system and method for harvesting solar energy, and more particularly an energy-positive sky lighting system that may provide an integrated energy solution to a variety of commercial buildings. A plurality of skylight modules are provided, each having a plurality of louvers configured to reflect incoming sunlight onto a thermal receiver area on an adjacent louver to heat a working fluid in communication with the louvers (i.e., such that heat transfer is carried out between the thermal receiver and the working fluid), all while allowing control of the amount of daylight that passes through the module. The modules are constructed such that the balance of the solar energy not going into day lighting is captured in the form of thermal heat, which in turn may be applied to building system cooling and heating applications.

A heat receiver, a reactor, and a heater utilize the heat of concentrated solar light for thermal decomposition and/or chemical reaction of coals, etc. The heat receiver includes: a side portion forming a substantially cylindrical side surface; a substantially circular bottom portion connected to the lower edge of the side portion; and a ceiling connected to the upper edge of the side portion. A substantially circular aperture is formed in the center of the ceiling. The heat receiver has a substantially cylindrical cavity and the opening portion is open. When the cavity has a diameter of D and a length of L, and the aperture has a diameter of d, d=D/2 or less and L=2D or more. Concentrated solar light entering the heat receiver is to be contained in the heat receiver to effectively utilize the solar light.

The invention provides a vacuum tube solar water heater. The vacuum tube solar water heater is characterized in that multiple vacuum tubes are aslant arranged at the lower part of the left side of a water storage bin; outer pipes are arranged at the externals of the vacuum tubes; closed inner pipes are arranged in the vacuum tubes; convex spheres are arranged at the upper ends of the inner pipes; a handle is arranged at the outer end of a rotating roller; a stop frame is arranged on the left side in the water storage bin; a water tank is arranged at the top end of the water storage bin; a filter screen is arranged at the middle part of the water tank; a water outlet is formed in the bottom end of the right side of the water storage bin; an insulation layer is arranged on the outer surface of the water storage bin; and a self-cleaning coating layer is arranged on the outer surface of the insulation layer. The equipment is reasonable and standard in structure; the internals of the vacuum tubes are transformed; the inner pipes of the vacuum tubes are closed; de-ionized water is filled in the inner pipes; the water is heated to become water vapor through heat collection by heat collecting pipes; the water vapor ascends to the water storage bin for heat exchange; and the operation is recycled to heat the water storage bin, so that the scale enrichment phenomenon on the inner surfaces of the vacuum tubes can be effectively solved.

A solar heat collector (100) is provided which has a plurality of upper air channels (3) arranged adjacently. A first flow control means (20) is provided at a first end of the upper air channels (3) and a second flow control means (20) is provided at a second end of the air channels (3). Each flow control means (20) is movable between a first position in which flow through the upper air channels (3) is substantially prevented and a second position wherein flow though the upper air channels (3) is permitted. Also described are a heat exchanger (100B), a fan (72), and a variety of flow modes.

The present application discloses a method and an apparatus for solar power generation through gas volumetric heat absorption based on characteristic absorption spectrum. A radiation energy conversion device absorbs concentrated solar radiation and converts radiation energy into thermal energy; the thermal energy is transferred to the other side of the radiation energy conversion device and then is converted into radiation energy; and the energy is transferred in a receiver cavity. The working gas from the outlet of a recuperator flows into the receiver cavity and absorbs the radiation energy. The heated working gas with high temperature flows into a turbine, doing shaft work through expansion. The expanded working gas flows through the recuperator to exchange heat. The working gas flows into a cooler, a compressor and the recuperator in sequence, and then flows into a receiver cavity to be heated volumetrically, completing a thermal power cycle.

A system of passively heating water using solar energy and an absorber formed from two identical halves of molded darkened glass that are fused together. The absorber is essentially a plurality of black glass struts that are sandwiched between two black glass surfaces. The struts act as baffle plates and define cells. Water is carried through the system via the thermosiphoning effect.

The invention relates to a nanofluid-based system for improving the solar thermoelectricity generating efficiency. The nanofluid-based system comprises a nanofluid-based direct absorption type vacuum pipe heat collecting system, a nanofluid-based heat storage pool, a nanofluid-based cold end radiator, a thermoelectric device heat end heat exchanger and a thermoelectricity generating system; the nanofluid-based direct absorption type vacuum pipe heat collecting system is connected with the nanofluid-based heat storage pool through a pipeline; the nanofluid-based heat storage pool is connected with the thermoelectric device heat end heat exchanger through a pipeline; the thermoelectric device heat end heat exchanger and the thermoelectricity generating system are directly installed together; the nanofluid-based cold end radiator is a radiator of the thermoelectricity generating system; and the nanofluid-based cold end radiator and the thermoelectricity generating system are connected together through a pipeline. By means of the nanofluid-based system for improving the solar thermoelectricity generating efficiency, integration of heat absorption, transfer and storage is achieved, a heat exchanger is omitted in the solar optothermal absorption, storage and conveying processes, the heat exchange link is simplified, and thermal energy losses are decreased.

A solar absorber body for a concentrating solar power system, said solar absorber body including: a tube, designed to contain a heat transfer medium and including a first part designed to be exposed to the sunlight and a second part designed to be unexposed to the sunlight, an assembly of fins made of thermally conductive material, and a selective coating arranged at least on the outer surface of the first part of the tube, said assembly of fins defining at least two longitudinal passages inside the tube, said passages being adjacent in a sectional plane perpendicular to the longitudinal axis of the tube, said assembly of fins being configured to create a continuous thermal bridge inside the tube from at least a portion of the inner surface of first part of the tube to at least a portion of the inner surface of the second part of the tube.

The invention provides a solar heat accumulation system which comprises a heat collector and a heat accumulator. A heat accumulator pipeline is provided with the heat accumulator pipeline valve and a heat accumulator pipeline temperature sensor. A bypass pipeline is provided with the bypass pipeline valve and a bypass pipeline temperature sensor. A central controller automatically controls opening and closing of the heat accumulator pipeline valve, the bypass pipeline valve and the outlet pipe valve according to the detected temperature of a heat accumulator inlet pipe, the detected temperature in a water tank and the detected temperature of the bypass pipeline. Through intelligent control over the heat accumulator pipeline valve, the bypass pipeline valve and the outlet pipe valve, the solar heat accumulation system achieves intelligent control over heat accumulation.