Solar high-efficiency dual temperature phase-change collector and phase-change material for collector

Abstract

The invention discloses a solar high-efficiency dual temperature phase-change collector, which comprises a water inlet header, a guide pipe, a heat exchange pipe, a water outlet header, evacuated collector tubes and heat accumulators, wherein the heat accumulators are arranged inside the evacuated collector tubes, and respectively comprise an intermediate temperature phase-change material filling cavity and a high temperature phase-change material filling cavity to form a dual temperature phase-change system; composite paraboloid condensers are arranged outside the evacuated collector tubes along the axial direction. The invention also provides a high temperature phase-change material, which comprises the following components in percentage by weight: 2 to 4.5 percent of nanocrystalline metal copper, 1 to 2 percent of dispersing agent and the balance of erythritol, wherein the dispersing agent comprises oleic acid and lauryl sodium sulfate in a weight ratio of 1:1. Each heat accumulator of the collector has an intermediate temperature side and a high temperature side, the two sides are filled with phase-change materials in different phase-change temperatures, a pipeline structure for heating cold water sequentially is designed, and the gradient utilization of energy is achieved; energy storage materials, the evacuated collector tubes and the composite paraboloid condensers are combined to greatly improve the effective utilization rate of solar energy.

Description

technical field [0001] The invention relates to the technical field of solar resource utilization, in particular to a solar high-efficiency dual-temperature phase-change heat collector and a phase-change material used in the heat collector. Background technique [0002] Solar energy is an effective renewable new energy, which has the advantages of sufficient, clean, environmentally friendly and safe, and has been more and more developed and applied. not tall. Therefore, efficient use of solar energy, use of excess solar energy during the day for heating at night, use of sufficient solar energy in sunny days for cloudy days, or use of solar energy in summer for heating in winter (seasonal heat storage), requires a certain structure. High-efficiency heat collectors are combined with energy storage systems. [0003] The solar water heaters in the prior art mainly include a heat collector, an insulated water tank, connecting pipes and supports. The disadvantage of this solar w...

AI Technical Summary

Problems solved by technology

All-glass vacuum heat collectors are low in cost, but have large heat capacity, slow thermal start-up, and poor reliability

The flat plate collector has good performance and high reliability, but because the antifreeze needs to use the secondary circuit, the cost is high, the installation requirements are high, and the heat energy utilization rate is low

And as far as solar energy itself is concerned, its shortcomings of low density, intermittent and poor stability lead to the inability of the collector to make full use of solar energy. In the prior art, there is no perfect solution to these problems.

[0004] Chinese patent document CN201310178000.6 discloses an energy-storage solar collector, which puts an energy-storage rod filled with heat-storage material inside a glass vacuum heat-collecting tube, the heat-exchanging tube is inside the energy-storage rod, and the flow guide tube In the heat exchange tube, the energy storage rod of this kind of heat collector can only absorb the heat energy from the direct sunlight side, and the heat energy utilization rate is not high

Since one side of the heat storage unit faces the sun and the other side faces away from the sun, although a concentrating plate can be used to gather light, there must be a temperature difference between the two sides of the heat storage unit, and only one heat storage material cannot fully absorb heat energy according to the temperature difference, and the energy can be used in stages

[0005] About the solar high-efficiency dual-temperature phase-change heat collector of the present invention and the phase-change material used for the heat collector, there is no report yet

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