Solar heat storage device across seasons

Abstract

The invention discloses a solar cross-season zoning heat storage device, which comprises a heat storage medium, heat storage body shape and structure characteristics, a heat storage body inner structure characteristic, a heat exchanger structure characteristic and a heat exchange pipe connection method, and is characterized in that the heat storage medium is a solid heat storage medium formed by uniformly mixing water, soil and dinas according to a certain proportion; the shape of a heat storage body formed by stacking the heat storage medium is one of a cylinder, a cylinder with one end provided with a dome, a cylinder with two ends provided with domes, a sphere and a cylinder and cone combined body; the periphery of the heat storage body is covered by a heat insulating layer; the inside of the heat storage body is divided into 2-5 independent heat storage regions which are separated by the heat insulation layer; a heat exchanger is heat exchange pipes which are in a horizontal layered layout; each layer of heat exchange pipe is in a spiral involute layout which gradually spreads from the center to the edge.

Description

technical field [0001] The invention relates to the technical field of solar energy storage, in particular to a solar energy cross-season partition heat storage device that utilizes mixed materials of water, soil and sand to store heat. Background technique [0002] Due to the discontinuity and seasonal variation of solar energy, the heat energy required for solar building heating is not only collected in winter, but also needs to be stored in the non-heating season. The solar energy stored in the season is a device used in the heating season, which is very important to improve the stability of the system and the utilization rate of solar energy. Among the current solar interseasonal heat storage technologies, the buried tube heat storage technology using soil has become an important application technology because of its large heat storage and low cost. However, for small and medium-sized high-temperature buried pipe heat storage systems, the heat loss of the heat storage s...

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Problems solved by technology

[0007] 1. The problem of low thermal conductivity and low heat storage density of naturally accumulated soil heat storage body

The heat storage soil used in the above literature is formed by natural accumulation. This kind of soil, especially the soil in the northern arid area, is relatively loose and has low density, so the thermal conductivity and heat storage density of the soil are relatively low. The system has caused a great problem of heat storage and release

[0008] 2. The open small-scale high-temperature heat storage system leads to the problem of excessive heat loss during the heat storage process

For small-scale high-temperature buried pipe heat storage systems, due to the long heat storage period and no special insulation layer around them, the heat loss in the whole process is very large, resulting in a decrease in the thermal efficiency of the system, which affects the performance of this type of heat storage system application

[0009] 3. The shape design of the heat storage body is unreasonable

[0010] 4. The entire heat storage body has no partitions and is composed of a heat exchange unit, which results in the homogeneity of the thermal energy quality inside the heat storage body and cannot supply heat energy separately according to demand

The temperature required at both ends of the building heating period is low, and the temperature required in the middle of the heating period is high. For this solar inter-seasonal heat storage system, the system stores more heat and the temperature is high in the early stage of heating, but at this time the building needs less heat energy and the temperature is low. At this time, the use of high-temperature heat storage heat energy to supply low-temperature demand heat energy has the problem of unreasonable utilization of high-quality heat energy; in the mid-term of heating, the heat stored in the heat storage system decreases and the temperature decreases, while the heat energy required by the building increases and the temperature rises , even if the heat stored in the heat storage system is sufficient at this time, the system cannot provide heat effectively because the stored temperature is not high enough, resulting in a structural contradiction in heat supply

[0011] 5. Although the heat pipe heat exchanger has high heat exchange efficiency, the construction cost is also high

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