摘要:
A solar energy collector apparatus and method, the apparatus including an open-top shell structure configured with either an enclosed or lattice configuration and having a Fresnel lens system covering the open top of the shell structure. A mirror system and solar energy absorber apparatus are placed inside the shell structure. The shell structure is mounted upon a hollow axle for rotation about its longitudinal axis. The shell structure is also mounted for vertical movement of one end of the longitudinal axis to adapt the shell structure for following north-south changes in the sun's seasonal position. The hollow axle supports the solar energy absorber apparatus nonrotatably inside the shell structure and in fluid communication with insulated heat transfer conduits that pass nonrotatably through the hollow axle. A photovoltaic apparatus may be included in the shell structure for converting at least a portion of the solar flux to electrical energy while the heat transfer conduits supply any necessary cooling to the photovoltaic apparatus. This combination of features provides higher solar efficiencies and higher temperatures in the heat transfer fluid. The method includes tracking the sun with the solar energy collector apparatus thereby maximizing the amount of solar energy collected while eliminating twisting and thereby coupling failures in the heat transfer conduits.
摘要:
A solar energy collector apparatus and method, the apparatus including an open-top shell-like structure with a reflective optical system in the shell structure for directing solar energy toward a solar energy absorber apparatus inside the shell structure. The shell structure is mounted upon a hollow axle for rotation about its longitudinal axis and may be mounted for vertical movement to follow north-south changes in the apparent seasonal position of the sun. The solar energy absorber apparatus is nonrotatably mounted inside the shell structure in fluid communication with heat transfer conduits that pass through the hollow axle thereby avoiding rotatable couplings in the conduits. Photovoltaic apparatus for converting at least a portion of the solar spectrum to electrical energy may also be included in the shell structure. This combination of features provides higher solar efficiencies and higher temperatures in the heat transfer fluid. The method includes tracking the sun with the solar energy collector apparatus thereby maximizing the amount of solar energy collected while eliminating coupling failures in the heat transfer conduits.
摘要:
A ring of transmitter and receiver transducer arrays circumbscribes an object to be scanned. Semicircular wave fronts of ultrasound energy are propagated from different points around the ring of transducers by triggering the transmitter arrays in sequence. The reflected and transmitted ultrasound energy picked up by the receiver arrays is then electronically analyzed and a synthetically focused image corresponding to the scanned object is reconstructed on a display screen. Surprisingly high quality resolution for the reconstructed images is achieved by carefully controlling the type of waveform from which the displayed image is reconstructed. In one embodiment of the invention, the signals received by the receiver arrays are processed by a waveshaping circuit to achieve the desired waveform. In a second embodiment of the invention, the desired waveform is generated by a waveform generator circuit and transmitted by the transmitter arrays. The quality of resolution for the reconstructed image of reflection is further improved by obtaining, through a computer aided ray tracing technique, the connecting rays between each point in the object and each transmitter and receiver array element. Data sampling times for each point in the reconstructed image are then corrected for refraction by computer aided integration of the object's refractive index along each connecting ray. Correction of the sampled data for amplitude attenuation is similarly obtained by computer aided integration of the object's linear attenuation coefficient along the connecting rays.
摘要:
An improved apparatus and method for absorbing solar energy, the apparatus providing a sealed envelope having a transparent upper panel with a solar energy absorbing panel thermally isolated against convective and conductive heat losses by a partial vacuum in the sealed envelope. The transparent panel has an upwardly extending curvilinear surface which increases its strength characteristics against the pressure differential between the ambient and the partial vacuum inside the envelope. Support structure is also provided in conjunction with the apparatus to place the periphery of the transparent panel under constriction to compensate for tensile stresses imposed thereon by the pressure differential. The inside surface of the transparent panel and the absorber panel are selectively coated with an infrared reflective surface to reflect and reduce losses of infrared radiation emitted by the absorber panel.
摘要:
An apparatus and method for rapid real time imaging with wavefield energy by inverse scattering using a C.P.U programmed to process data derived from wavefield energy that has been transmitted and scattered by an object so as to reconstruct a wavefield image of the object. Electronic signals are propagated and are transduced into wavefield energy waves which in turn are propagated toward the object. Detector means detect the wavefield energy waves scattered by the object. The detected wavefield energy waves are then electronically processed and input into a high-speed digital computer which may comprise a C.P.U. and/or a C.P.U in combination with an array or parallel processor. Data is also prepared and input to the computer representing the incident field and the computer then reconstructs a high-quality image of the object having high spacial resolution and including actual internal viscous and elastic properties of the object through the use of new inverse scattering techniques used in the data processing steps. The media in which the object is embedded may be fluid or solid, homogeneous, or layered (such as stratigraphic layering, or ocean velocity layers, or layering of composites in nondestructive imaging applications), or may consist of porous material (either sedimentary deposits or composites in nondestructive testing).
摘要:
An apparatus and method for reconstructing an acoustic image of an object using a central processing unit programmed to process data derived from acoustic energy that has been transmitted at multiple frequencies and scattered by the object. Electronic signals are propagated at multiple frequencies and transduced into acoustic energy waves which are propagated toward an object. Transducer receivers detect the acoustic energy waves after they have been scattered by the object and the detected acoustic energy waves are then electronically processed and input into a high-speed digital computer which may comprise a central processing unit and/or a central processing unit in combination with an array processor. Data is also prepared and input to the computer representing the incident field and the computer then reconstructs a high-quality image of the scanned object so as to produce an image having high spacial resolution and including actual internal viscous and elastic properties of the object through the use of new inverse scattering techniques used in the data processing steps.
摘要:
An apparatus and method for elemental analysis and non-invasive measurement of the mass flow rate and/or density distribution of a multiple-phase system. The apparatus includes at least two X-ray sources, transmission detectors for the X-ray sources, fluorescence detectors, and collimators all of which are suitably indexed and multiplexed to provide information corresponding to the density distribution, elemental composition, phase composition, and/or flow rate of the system. Energy selective detectors are included in the apparatus to provide selective fluorescent radiation detection for fluorescence emitted by elements excited by the X-rays as a technique for obtaining an indication of the elemental composition of the system. X-ray sources and transmitted X-ray detectors are used to detect the density of the multiple-phase system at each point in a cross-section of the system. Corresponding second X-ray sources and detectors are mounted a moderately short distance from the first X-ray source and detector combination. The total mass flow rate and density distribution of the system is the integral over the area of the conduit for a plurality of point mass transfer rates and densities. A conventional computer system is included as part of the flowmeter and materials analysis apparatus to correlate and process the readings obtained by the various detectors and obtain thereby the mass flow rate, density and elemental composition of the multiple-phase system.
摘要:
An improved apparatus and method for absorbing solar energy, the apparatus providing a sealed envelope having a transparent upper panel with a solar energy absorbing panel thermally isolated against convective and conductive heat losses by a partial vacuum in the sealed envelope. The transparent panel has an upwardly extending curvilinear surface which increases its strength characteristics against the pressure differential between the ambient and the partial vacuum inside the envelope. Support structure is also provided in conjunction with the apparatus to place the periphery of the transparent panel under constriction to compensate for tensile stresses imposed thereon by the pressure differential. The inside surface of the transparent panel and the absorber panel are selectively coated with an infrared reflective surface to reflect and reduce losses of infrared radiation emitted by the absorber panel.
摘要:
A solar energy collector apparatus and method, the apparatus including an open-top shell-like structure. A Fresnel lens system and a mirror system inside the shell structure focus and direct solar energy toward a solar energy absorber apparatus also inside the shell structure. The shell structure is mounted upon a hollow axle in a framework for rotation about its longitudinal axis. The framework supports the longitudinal axis in a position generally parallel to the axis of rotation of the earth to provide an equatorial mounting for the solar energy collector. Rotation about the longitudinal axis adapts the solar collector for following the east-west movement of the sun. The optical apparatus in the shell structure is adapted for movement to follow the north-south seasonal changes in the sun's position. The solar energy absorber apparatus is nonrotatably supported inside the shell structure by the hollow axle and heat transfer conduits pass through the hollow axle to the solar energy absorber apparatus in nonrotable relationship therewith. A photovoltaic apparatus may be included within the shell structure for converting at least a portion of the incoming solar spectrum to electrical energy. This combination of features provides higher solar efficiencies and higher temperatures in the heat transfer fluid. The method includes tracking the sun with the solar energy collector apparatus thereby maximizing the amount of solar energy collected while eliminating coupling failures in the heat transfer conduits.
摘要:
A heat storage apparatus and method including a heat storage medium encapsulated within a container and heat exchange apparatus for exchanging thermal energy with the heat storage medium. The heat storage medium may include a salt having a relatively high latent heat of reaction at a relatively low temperature range. The dehydration reaction of sodium sulfate decahydrate appears to the most promising reaction for this application. Other suitable salts and salt mixtures for other temperature ranges may also be used. The apparatus includes, where necessary, techniques for stirring the heat storage medium to inhibit stratification of the salt during cycles of dissolution and recrystallization or fusion.