Borehole-type seasonal heat storage system capable of selecting heat storage space according to supply temperature of heat source

Abstract

Provided is a borehole-type seasonal heat storage system and, more particularly, to a borehole-type seasonal heat storage system capable of selecting a heat storage space according to a supply temperature of a heat source, wherein a first heat storage tube member is formed to comprise a supply tube and a recovery tube, which are formed in ring types, respectively, and to have a U-shaped vertical tube connected to the bottom surface thereof such that the same is inserted into a borehole; an n th heat storage tube member is formed to have a supply tube and a recovery tube, which have diameters larger than those of the supply tube and the recovery tube of the first heat storage tube member, respectively; the n th heat storage tube member is arranged outside the first heat storage tube member at an appropriate interval, thereby forming a seasonal heat storage body; the supply temperature of a heat source flowing into a main supply tube and the underground temperature of each part of the seasonal heat storage body are measured; and, according to the supply temperature of the heat source, heat is supplied to the first heat storage tube member or the n th heat storage tube member, which has the corresponding temperature, and is stored, thereby improving the heat storage performance.

1 . A borehole-type seasonal heat storage system capable of selecting heat storage space according to supply temperature of heat source, comprising: a main supply tube for being supplied with heat from heat source; a main recovery tube for recovering heat; a seasonal heat storage body including a heat storage tube member which consists of a partially-cut ring-shaped supply tube, a recovery tube formed in a pair in parallel at a side of the supply tube, and a plurality of U-shaped vertical tubes whose one end is connected to the bottom surface of the supply tube and another end is connected to the bottom surface of the recovery tube, thereby each being inserted to boreholes, wherein there are a plurality of heat storage tube members, installed, whose diameter expands toward a low temperature part outside based on a high temperature part, a center part, and each of the supply tube and the recovery tube is connected to the main supply tube and the main recovery tube; a first temperature sensor, installed in the main supply tube, for measuring supply temperature of heat source; second temperature sensor parts, installed in a plural type to any of boreholes of the seasonal heat storage body, for measuring underground temperature; a solenoid valve part installed between the main supply tube and each supply tube of the seasonal heat storage body and between the main recovery tube and each recovery tube of the seasonal heat storage body; and a controller for controlling opening and closing of the solenoid valve part by receiving supply temperature of heat source and underground temperature from the first temperature sensor and the second temperature sensor parts upon storing heat and then, by supplying and storing heat of the main supply tube to the heat storage tube member of the seasonal heat storage body, which corresponds to the supply temperature of heat source. 
     
     
         2 . The system according to  claim 1 , wherein the heat storage tube member of the seasonal heat storage body forms the vertical tubes of equal length, or shortens as going from the low temperature part to the high temperature part. 
     
     
         3 . The system according to  claim 1 , wherein the heat storage body comprises a tank or a pit in the high temperature part. 
     
     
         4 . The system according to  claim 3 , wherein the vertical tubes of the heat storage tube member in the seasonal heat storage body are formed in a zigzag in the tank or the pit. 
     
     
         5 . The system according to  claim 1 , wherein the controller controls opening and closing of the solenoid valve part for heat radiation throughout the heat storage tube member of the seasonal heat storage body, which corresponds to target temperature of heat radiation, by receiving underground temperature from the second temperature sensor parts upon heat radiation.