Solar heat storage type vacuum heat pipe

Abstract

The invention discloses a solar heat storage type vacuum heat pipe, comprising an outer-layer glass pipe (1), an inner stainless steel pipe (2) mounted in the outer-layer glass pipe (1), a middle heat conductive pipe (3) mounted in the inner stainless steel pipe (2), a heat storage phase-change material (4) filled between the inner stainless steel pipe (2) and the middle heat conductive pipe (3), expansion joint corrugated pipes (5) arranged at ends of the heat pipe, getters (6) arranged at two ends in the heat pipe, a stainless steel support frame (7) arranged between the outer-layer glass pipe (1) and the inner stainless steel pipe (2), and an inner glass pipe (8) butt jointed with the outer-layer glass pipe (1) and sealed with the same in a melting manner. The water heater provided by the invention is rational in structure design, free of water tanks, capable of being integrated with buildings, convenient to mount and maintain, high in safety factor, large in illuminating area, and high in heat absorption rate and stored heat energy, adopts the optimized heat storage phase-change material such that heat exchange can be performed according to requirements, can obtain fresh hot water upon using, and is wide in application range.

Description

technical field [0001] The invention relates to the field of solar heat utilization, in particular to a solar heat storage type vacuum heat pipe for a solar water heater. Background technique [0002] Solar thermal technology provides broad prospects for solving energy problems in the future. At present, solar water heaters mainly include high borosilicate glass vacuum tube type and high-efficiency heat-absorbing blue film flat plate type. The vacuum tube has been developed for more than 20 years and the coating process is very mature. From single target to Multi-target magnetron sputtering coating technology, the heat absorption efficiency of the film layer has reached more than 94%, and the low-temperature anti-reflection rate has reached below 6%, which is in a relatively ideal state. As long as the production process is strictly controlled according to the mature process, it can produce high-quality products. High vacuum tubes, vacuum tube water heaters have very good ad...

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Problems solved by technology

[0002] Solar thermal technology provides broad prospects for solving energy problems in the future. At present, solar water heaters mainly include high borosilicate glass vacuum tube type and high-efficiency heat-absorbing blue film flat plate type. The vacuum tube has been developed for more than 20 years and the coating process is very mature. From single target to Multi-target magnetron sputtering coating technology, the heat absorption efficiency of the film layer has reached more than 94%, and the low-temperature anti-reflection rate has reached below 6%, which is in a relatively ideal state. As long as the production process is strictly controlled according to the mature process, it can produce high-quality products. High vacuum tubes, vacuum tube water heaters have very good advantages, high absorption rate per unit area, low emissivity, good heat preservation, especially in colder areas, have unique advantages, but also have obvious disadvantages, can not be well combined with the building, subject to Due to the limitation of pipe diameter, the heat absorption area is small, and the heat absorption efficiency of double-layer glass is affected. The glass is easy to break and has inherent safety hazards. Therefore, foreign vacuum tube water heaters are less used; Fast heat, easy to combine with buildings, the cover plate is tempered ultra-clear glass, no safety hazards, etc., but there are also obvious disadvantages, the heat absorption area is large and the heat dissipation area is also large, so the heat balance temperature is low, low temperature and high efficiency cannot obtain high temperature, no insulation In order to prevent scaling of hot water, it depends on the heat conduction of the medium, so it is only suitable for areas with high temperature in the south. So far, there is no water heater that can combine the advantages of these two water heaters, which is easy to promote in any area and can solve common problems. Water heaters develop from low temperature to medium temperature, and can develop into steam water heaters. At the same time, water heaters are troublesome to install, have many parts, and are not easy to maintain. The hot water storage tank takes up a lot of space and is not safe. A pressure pump must be installed in order to pressurize the water. , whether it is a vacuum tube type or a flat type, it is often a decoration in winter and relies heavily on electric auxiliary heating. state of decline

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