Solid-liquid combined heat storage method suitable for variable-temperature heat source

Abstract

The invention discloses an underground solid-liquid combined heat storage method suitable for a variable-temperature heat source. A heat storage system comprises a heat storage water tank, a lower water pipe, an upper water pipe, heat storage gravel, a pumping and recharging well, a waterproof heat preservation layer, the variable-temperature heat source, a high-temperature heat collector, a low-temperature heat collector, a controller, a circulating pump, a temperature sensor, a pressure sensor and a valve. According to the underground solid-liquid combined heat storage method suitable for the variable-temperature heat source, on the basis that the temperature of the heat source changes between a high-temperature area and a low-temperature area, the water tank and a gravel layer serve as a combined heat storage body, heat of the high-temperature area of the heat source is stored in the water tank, heat of the low-temperature area of the heat source is stored in the gravel layer, double-temperature-area heat storage is achieved, the water tank is located in the gravel layer, due to the fact that the gradual temperature gradient is constructed, high-temperature core heat of the water tank is effectively protected, heat exchange can be conducted through a high-temperature heat storage body and a low-temperature heat storage body according to the heat requirement of a user, and reasonable utilization of energy quality is achieved.

Description

technical field [0001] The invention belongs to the technical field of underground heat storage and utilization, and particularly relates to the problem of heat storage of variable temperature heat sources. Background technique [0002] Compared with other heat storage media, water has a larger specific heat capacity, and the heat transfer intensity is easy to control, so water body heat storage has always been the main form of underground heat storage technology. This technology generally adopts the direct excavation of the hot water storage pool on the ground, laying a waterproof layer in the pool, and setting a floating roof structure on the top for thermal insulation, relying on the buoyancy of water to support the top structure of the pool, but this structure has a small load-bearing capacity, and the upper layer cannot be replanted. Vegetation or construction of any buildings or structures, so the area occupied by this floating roof heat storage pool cannot be effectiv...

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Problems solved by technology

If the heat is taken from the same heat storage medium, there will be a problem of "high level and low use" of energy quality, which is unreasonable from the perspective of energy quality

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