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.sup.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.sup.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.sup.th heat storage tube member, which has the corresponding temperature, and is stored, thereby improving the heat storage performance.

Claims

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.

Description

DESCRIPTION OF DRAWINGS

[0027] FIG. 1 is a drawing showing types and constitutions of seasonal heat storage systems.

[0028] FIG. 2 is a plane view showing a borehole type among seasonal heat storage systems.

[0029] FIG. 3 is a schematic diagram showing the constitution of a borehole-type seasonal heat storage system capable of selecting heat storage space according to supply temperature of heat source according to embodiment of the present invention.

[0030] FIG. 4 is a plane view showing the constitution of a heat storage tube member of FIG. 3.

[0031] FIG. 5 is a partial perspective view showing the partial constitutions of the heat storage tube member of FIG. 3.

[0032] FIGS. 6 to 8 are schematic diagrams showing the constitutions of the borehole-type seasonal heat storage system capable of selecting heat storage space according to supply temperature of heat source according to other embodiments of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] The configuration of a borehole-type seasonal heat storage system capable of selecting heat storage space according to supply temperature of heat source, according to the present invention, will be described in detail with the accompanying drawing.

[0034] In the following description of the present invention, a detailed description of known incorporated functions and configurations will be omitted when to include them would make the subject matter of the present invention rather unclear. Also, the terms used in the following description are defined taking into consideration the functions provided in the present invention. The definitions of these terms should be determined based on the whole content of this specification, because they may be changed in accordance with the option of a user or operator or a usual practice.

[0035] FIG. 3 is a schematic diagram showing the constitution of a borehole-type seasonal heat storage system capable of selecting heat storage space according to supply temperature of heat source according to embodiment of the present invention; FIG. 4 is a plane view showing the constitution of a heat storage tube member of FIG. 3; and FIG. 5 is a partial perspective view showing the partial constitutions of the heat storage tube member of FIG. 3.

[0036] Referring to FIGS. 3 to 5, a borehole-type seasonal heat storage system(1) capable of selecting heat storage space according to supply temperature of heat source according to embodiment of the present invention consists of a main supply tube(10), a main recovery tube(20), a seasonal heat storage body(30), a first temperature sensor(40), second temperature sensor parts(50), a solenoid valve part(60) and a controller(70).

[0037] First, the main supply tube(10) is provided with heat in a solar collector(not illustrated), for example.

[0038] Then, the main recovery tube(20) recovers heat media, whose temperature falls after storing heat in the seasonal heat storage body(30), to the solar collector(not illustrated).

[0039] Also, the seasonal heat storage body(30) is perforated with a plurality of boreholes(31) under the ground and stores heat from heat source by installing a heat storage tube member(33).

[0040] Here, the heat storage tube member(33) consists of: a partially-cut ring-shaped supply tube(33a); a recovery tube(33b) formed in a pair in parallel at a side of the supply tube(33a); and a plurality of U-shaped vertical tubes(33c) whose one end is connected to the bottom surface of the supply tube(33a) and another end is connected to the bottom surface of the recovery tube(33b), thereby each being inserted to boreholes(31), wherein there are a plurality of members of heat storage tubes(33), installed, whose diameter expands toward a low temperature part outside based on a high temperature part, a center part. Here, the supply tube(33a) and the recovery tube(33b) of each heat storage tube member(33) are connected to the main supply tube(10) and the main recovery tube(20); vertical tubes(33c) of the member of the heat storage tube(33) are equal in length as illustrated in FIG. 3; and four types(a, b, c, d) are illustrated in embodiment of the present invention. Further, the recovery tube(33b) of each member of the heat storage tube(33) is connected to the supply tubee(33a) of the heat storage tube member(33), positioned to adjacent outside and then, heat is supplied from the supply tube(33a) of any heat storage tube member(33) to the recovery tube(33b). Then, heat goes to the recovery tube(33b) after passing to the supply tube(33a) of the member of the heat storage tube(33), located outside, again.

[0041] Also, it is desirable that boreholes(41) are formed in several meters of gap, and the length of the vertical tubes(33c) is the same as the diameter of the seasonal heat storage body(30) for minimizing heat loss(the rounder the shape is, the more heat loss is minimized).

[0042] Further, installed in the main supply tube(10), the first temperature sensor(40) measures supply temperature of heat source.

[0043] Continuously, there are a plurality of the second temperature sensor parts(50) installed to any of boreholes(31) of the seasonal heat storage body(30), thereby measuring heat storage temperature(Ta, Tb, Tc, Td). Here, it is desirable that each sensor of the second temperature sensor parts(50) is placed to the bottom surface of the center of boreholes, and at least more than one sensor is formed to each borehole(31) to which each heat storage tube member(33) is installed.

[0044] Further, as illustrated in FIGS. 3 and 4, installed between the main supply tube(10) and the heat storage tube member(33), each of a plurality of solenoid valves(V1V9) of the solenoid valve part(60) is opened and closed by the controller(70), thereby being installed between the main supply tube(10) and each supply tube(33a) of the seasonal heat storage tube(30) and between the main recovery tube(20) and each recovery tube(33b) of the seasonal heat storage body(30) for selectively supplying heat to each heat storage tube member(33).

[0045] In addition, the controller(70) controls opening and closing of the solenoid valve part(60) by receiving supply temperature of heat source and underground temperature from the first temperature sensor(40) and the second temperature sensor parts(50) upon storing heat and then, by supplying and storing heat of the main supply tube(10) to the heat storage tube member(33) of the seasonal heat storage body(30), which corresponds to the supply temperature of heat source. Here, the controller(70) controls opening and closing of the solenoid valve part(60) for heat radiation throughout the heat storage tube member(33) of the seasonal heat storage body(30), which corresponds to target temperature of heat radiation, by receiving underground temperature from the second temperature sensor parts(50) upon heat radiation.

[0046] Meanwhile, the borehole-type seasonal heat storage system(1) capable of selecting heat storage space according to supply temperature of heat source according to other embodiment of the present invention may form vertical tubes(33c) in different length, or form a tank(T) or a pit(P), as illustrated in FIGS. 6 to 8.

[0047] FIGS. 6 to 8 are schematic diagrams showing the constitutions of the borehole-type seasonal heat storage system capable of selecting heat storage space according to supply temperature of heat source according to other embodiments of the present invention.

[0048] As illustrated in FIG. 6, the vertical tubes(33c) of the heat storage tube member(33) may shorten from the low temperature part to the high temperature part, wherein it is possible to minimize heat loss by focusing high-temperature heat on a center part if the high temperature part becomes smaller in length.

[0049] Furthermore, as illustrated in FIGS. 7 and 8, the seasonal heat storage body(30) may include the tank(T) or the pit(P) in the high temperature part. Here, it is desirable that the vertical tubes(33c) of the heat storage tube member(33) in the seasonal heat storage body(30) are formed in a zigzag in the tank(T) or the pit(P) for maximizing heat exchange performance.

[0050] First, upon storing heat, the controller(70) receives supply temperature of heat source and underground temperature from the first temperature sensor(40) and the second temperature sensor parts(50).

[0051] Then, in case that supply temperature of heat source is over Ta as compared to supply temperature of heat source and underground temperature(Ta, Tb, Tc, Td), the controller(70) closes solenoid valves(V7, V8, V9) of the solenoid valve part(60) for making heat flow gradually from a center of the seasonal heat storage body(30) to an outer part and opens the rest, thereby supplying heat to a of the seasonal heat storage body(33), which is a center, for heating and then, discharging heat while heating followed by b, c, d.

[0052] Further, in case that supply temperature of heat source is under Ta, but over Tb as compared to supply temperature of heat source and underground temperature(Ta, Tb, Tc, Td), the controller(70) closes solenoid valves(V3, V4, V8, V9) of the solenoid valve part(60) and opens the rest, thereby supplying heat to b of the seasonal heat storage body(33) for heating and then, discharging heat while heating followed by c, d.

[0053] Furthermore, in case that supply temperature of heat source is under Tb, but over Tc as compared to supply temperature of heat source and underground temperature(Ta, Tb, Tc, Td), the controller(70) closes solenoid valves(V2, V5, V9) of the solenoid valve part(60) and opens the rest, thereby supplying heat to c of the seasonal heat storage body(33) for heating and then, discharging heat while heating followed by d.

[0054] In addition, in case that supply temperature of heat source is under Tc, but over Td as compared to supply temperature of heat source and underground temperature(Ta, Tb, Tc, Td), the controller(70) closes solenoid valves(V1, V6) of the solenoid valve part(60) and opens the rest, thereby supplying heat to d only of the seasonal heat storage body(33) for heating and then, discharging heat.

[0055] Meanwhile, upon heat radiation, the controller(70) controls in a manner of the above method by receiving underground temperature from the second temperature sensor parts(50) and comparing target temperature of heat radiation and underground temperature. However, upon heat radiation, flow direction(not illustrated) of heat media is contrary to flow which is illustrated in FIGS. 3, 4, 6, 7 and 8.

[0056] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

TABLE-US-00001 <Explanation on reference numeral> 10: main supply tube 20: main recovery tube 30: seasonal heat storage body 31: boreholes 33: heat storage tube member 33a: supply tube 33b: recovery tube 33c: vertical tubes 40: first temperature sensor 50: second temperature sensor parts 60: solenoid valve part 70: controller P: pit T: tank