Cascaded phase change energy-storing medium-high temperature straight heat collecting tube

Abstract

The invention discloses a cascaded phase change energy-storing medium-high temperature straight heat collecting tube. The cascaded phase change energy-saving medium-high temperature straight heat collecting tube comprises a glass outer tube, a metal heat absorbing inner tube, an energy-storing core, a different diameter spring bracket and a flange ring. The metal heat absorbing inner tube is located between the glass outer tube and the energy-storing core, and the energy-storing core is located in the metal heat absorbing inner tube. Two ends of the energy-storing core are in lap joint to thedifferent diameter spring bracket, and the different diameter spring bracket and the flange ring are welded. Two ends of the glass outer tube is connected to a joint of the flange ring, two ends of the metal heat absorbing inner tube penetrate the flange ring and stretch to the outer side of the flange ring, and the metal heat absorbing inner tube is fixedly connected to the flange ring. The heatcollecting tube disclosed by the invention integrates heat collection and heat storage, so that the utilization ratio of energy is improved greatly, and the cascaded phase change energy-storing medium-high temperature straight heat collecting tube is convenient and easy to use, simple in structure, economical and environment-friendly and long in service life, and is widely popularized and appliedfavorably.

Description

technical field [0001] The invention relates to the technical field of solar photothermal utilization. Specifically, it is a medium-high temperature straight-through heat collecting tube for cascade phase change energy storage. Background technique [0002] The increasing poverty of fossil energy and the pollution caused by over-exploitation have led to an increasing demand for renewable energy at home and abroad. Renewable energy, especially solar energy, has great development potential, renewable and sustainable utilization, and plays an important role in promoting economic development, It plays an important role in improving energy structure, reducing environmental pollution, and meeting energy demand, and has attracted widespread attention at home and abroad. [0003] Solar thermal utilization has gradually expanded from solar water heaters to industrial and agricultural utilization fields such as solar heating, solar drying, and solar thermal power generation, and has ...

AI Technical Summary

Problems solved by technology

However, because solar energy is affected by seasons, day and night changes, and weather changes, the heat collected by a large number of solar thermal collection projects is unstable, and the cost of heat storage in the later period is high, making the utilization efficiency of most solar thermal collection projects low. The collector tube is frozen and paralyzed

[0004] Chinese patent document CN203719155U discloses a phase-change energy storage type solar vacuum heat collector, which uses an all-glass vacuum tube to store phase-change materials. Since the outer tube and the inner tube for storing phase-change materials are integrated special-shaped glass structures, its manufacturing cost High, not suitable for large-scale promotion and application; in addition, because each heat collector tube in practical applications is different from the micro heat collector tubes for theoretical research in the laboratory, but the heat collector tubes that can store more phase change materials have practical application value, The integrated special-shaped glass structure in the Chinese patent document CN203719155U determines that it is impossible to store a lot of phase change materials, otherwise the manufacturing cost will be very high; In the actual construction, the spring support is easy to damage the glass outer tube and the glass inner tube; and because the thermal conductivity of glass is worse than that of metal, even if the heat-absorbing material is applied on the glass inner tube, it cannot be used. Heat transfer effect of metals as storage phase change materials

[0005] Chinese patent document CN104848569A discloses a metal heat absorbing body energy storage type vacuum tube and a heat collector with the vacuum tube. Assembled together through the metal sealing cover, the bellows and the transition ring, the weight of the metal energy storage tube is transferred to the edge of the tube wall of the glass outer tube through the metal sealing cover, which requires a substantial increase in the strength of the tube wall of the glass outer tube, or Significantly reduce the weight of the metal energy storage tube and the phase change material stored in it to adapt to the strength of the glass outer tube. Therefore, this kind of collector is used as a laboratory theoretical research, but it is impossible to be scaled up in practical applications.

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