A cross-seasonal solar energy-phase change energy storage graded release energy heating system and method

Abstract

The invention belongs to the field of seasonal energy accumulation heating, and particularly relates to a seasonal solar energy-phase change energy accumulation graded energy-releasing heating system and method. The system mainly comprises a solar heat collector, a phase change energy accumulation heat exchanger, a heating module and a heat exchanger, all of which are connected together through a pipeline, a valve and a circulating pump. According to the system, in non-heating season, solar heat is stored in phase change materials with different temperature levels capable of realizing stable undercooling, so as to stand in an undercooling liquid state; in heating season, two modes, namely, heating load supply by direct heat exchange between heating medium water and the heat collector and heating load supply by direct heat exchange between the heating medium water and the phase change heat exchanger, can be adopted and the phase change material units with different temperature levels are triggered by grades to be solidified and release energy according to loads in different stages. By utilizing the conception that the seasonal phase change energy accumulation graded released energy is utilized to provide heating load in winter, the system has the characteristics of being large in phase change latent heat, stable in heat release temperature, capable of being adjusted by grades, and the like, thus having wide application prospects in a seasonal heat accumulation heat supply system.

Description

technical field [0001] The invention belongs to the field of interseasonal energy storage heating, in particular to an interseasonal solar energy-phase change energy storage hierarchical release energy heating system and method. Background technique [0002] With the improvement of people's requirements for residential comfort, low-temperature floor heating technology in winter is widely used in civil buildings because of its good thermal comfort and hygienic conditions. Ordinary heating hot water is mainly obtained by heat exchange of boilers or thermal power plants, relying on conventional energy sources such as coal and electricity. [0003] As the most common seasonal and intermittent renewable energy in nature, solar thermal energy is also gradually applied to floor heating. According to the technical regulations of ground radiant heating, low-temperature hot water ground radiant heating uses hot water not higher than 60°C as the heating medium, which can constitute a ...

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Problems solved by technology

At present, in the existing cross-seasonal energy storage and heat pump heating systems, the main energy storage media mainly include sensible heat storage such as hot water, gravel-water, soil and aquifers to store solar energy in summer, and the above forms have large thermal storage devices. , low heat storage efficiency and other issues, further research and design of the solar season phase change heat storage heat pump system, in summer, the phase change heat storage material is used to store solar heat energy, and the heat stored in the phase change material (PCM) is extracted from the heat in the heating season through the heat pump system. There are still problems such as large cross-seasonal heat dissipation loss of the heat storage device

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