JP2006084149A - Heating-cooling system using underground heat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a comfortable heating-cooling system using underground heat sufficiently practicable for a plurality of kinds of heating-cooling apparatuses in cooling, and capable of simultaneously supplying heat provided via a heat pump and heat gathered from the underground without passing through the heat pump. <P>SOLUTION: In cooling operation, the heat provided by using a heat exchange unit A by using a pipe group B1 among a plurality of pipe groups B1 and B2, is supplied to the heating-cooling apparatus 1 of an air blowing type among the plurality of kinds of heating-cooling apparatuses 1 and 2. The heat gathered from the underground by using the other pipe group B2 except for the pipe group B1, is directly supplied to the heating-cooling apparatus 2 of a radiation type different in a kind. A heating medium of the suitable two temperatures is respectively simultaneously supplied in response to the kind of the heating-cooling apparatuses. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a geothermal utilization air conditioning system that uses geothermal heat for a plurality of types of air conditioning equipment.

Recently, in residential buildings, office buildings, public buildings, etc., the introduction of geothermal heat-use air-conditioning systems using low-temperature and constant-temperature geothermal resources is increasing for the purpose of reducing CO ₂ emissions and heat island phenomenon. In such a geothermal heating / cooling system, a heat pump is used to compensate for the gap in the geothermal sampling temperature with respect to the temperature required for heating or cooling, and low-temperature and constant-temperature ground heat is generated through the heat pump. A general method is to increase the temperature or decrease the temperature, and to secure the necessary temperature during heating or cooling.

  In the current market, there is no geothermal heat-conditioning system that uses a heat medium such as water directly for indoor air-conditioning equipment without using a heat pump, but it is a special snow melting device that melts snow on the road surface. There is a technique described in Japanese Unexamined Patent Publication No. 2002-173905 (hereinafter referred to as Patent Document 1). The technology described in Patent Document 1 releases heat by collecting heat collected from spring water and underground and heat flow obtained by using a heat pump and a hot water tank with respect to a radiator pipe buried directly under the road surface. In normal times, the spring heat collected by the spring sampler and the geothermal heat collected by the pile-type sampler are discharged from the radiator pipe buried directly under the road surface through the direct connection pipe part. When snow melts and the temperature of the road surface decreases, the spring water and geothermal heat are used as a heat source for the heat pump, and the antifreeze liquid in the hot water tank is heated to a high temperature with the obtained high heat, and the high temperature antifreeze liquid is dissipated in the heat. It is a technology that melts snow by sending it to a pipe.

JP 2002-173905 A

  However, even if the technology described in Patent Document 1 is applied to an air conditioning system that uses a plurality of air conditioning units, the plurality of air conditioning units are either heat obtained through a heat pump, or heat collected from the ground, Only one of the heats can be used, and the different heats described above cannot be used simultaneously in each device. In order to use the heat obtained through the heat pump by the combination of the above configurations and the heat collected from the ground in each air conditioning device, the apparatus described in Patent Document 1 is required for each air conditioning device. However, in this configuration, each air conditioning device requires a device such as the heat pump described in Patent Document 1, so even if the different heats described above can be used simultaneously, the device configuration becomes complicated, and There is a problem of high costs.

  In addition, in a cooling and heating system using a heat pump, for example, when continuous cooling operation is performed all day, especially in the midst of hot summer, a heat medium whose temperature has been raised by a heat pump is passed through a pipe buried in the ground. Circulation is continued, and the underground temperature around the pipe gradually increases. Under such circumstances, even if the heat medium whose temperature has been increased by the heat pump is circulated in the pipe embedded in the ground, the temperature of the heat medium that returns to the heat pump is considerably higher than the temperature in the ground, It is difficult to use for heat exchange using the heat pump. In order to solve this problem, it is possible to increase the number of pipes buried in the ground. Since the number of pipes to be embedded is limited, the above problem cannot be avoided in practice. In addition, when the heat collected from the ground is used directly as a refrigerant for air conditioning equipment during cooling, if the heat medium reaches a high temperature as described above, the heat medium is used directly as a refrigerant for the air conditioning equipment. It is difficult to do.

  Accordingly, an object of the present invention is to provide a heat pump and a heat pump obtained through a heat pump that are sufficiently practical for a plurality of types of air-conditioning equipment, particularly during cooling, without complicating the device configuration and increasing the cost. The object is to provide a comfortable underground heating and cooling system that can simultaneously supply heat collected from the ground without passing through.

  A typical configuration of the present invention for achieving the above object is a geothermal heat-use air conditioning system that uses geothermal heat for a plurality of types of air-conditioning equipment, and the air-conditioning equipment is required by heat exchange using geothermal heat. A heat exchange unit that secures the temperature to be performed, a plurality of pipe groups that are divided into a plurality of groups that are buried in the ground and circulate the heat medium, and a plurality of pipe groups that are connected to the heat exchange unit via the heat exchange unit. A first heat exchange path that leads to the air conditioning equipment, and a second heat exchange path that bypasses the heat exchange unit from the plurality of pipe groups and leads to the air conditioning equipment, and during cooling operation of multiple types of air conditioning equipment, Among a plurality of types of cooling and heating equipment, a certain type of cooling and heating equipment is obtained by using the heat exchange unit using a part of the plurality of pipe groups and the first heat exchange path. Supply heat, said air conditioning For air conditioning equipment of a type different from the oven, use the heat exchange unit by using another pipe group other than a part of the pipe group used by the heat exchange unit and the second heat exchange path. It is possible to directly supply the heat collected from the ground without using it.

  Further, in the geothermal heat-use cooling and heating system configured as described above, the heat exchange unit uses an input terminal for inputting a signal for switching an operation mode of cooling or heating, and heat obtained by using the heat exchange unit in the cooling mode. It has a terminal block having two systems of control input terminals for identifying the air conditioning equipment and the air conditioning equipment that directly uses the heat collected from the ground.

  In the geothermal heat-use cooling and heating system configured as described above, a plurality of pipe groups are used for the heat exchange unit, and the plurality of pipe groups can be selectively used according to the temperature condition of the heat medium received by the air-conditioning equipment. It is characterized by.

  According to the present invention, at the time of cooling operation, the heat exchange unit is used by using a part of the plurality of piping groups for a certain type of cooling / heating device among the plurality of types of cooling / heating devices. In order to supply the heat obtained from the ground and directly supply heat collected from the ground using a pipe group other than the pipe group to different types of air-conditioning equipment, a suitable two-temperature heat medium Can be simultaneously supplied according to the type of the air conditioning equipment. As a result, the heat generated through the heat exchange unit and the ground without passing through the heat exchange unit, which is sufficiently practical for a plurality of types of air conditioning equipment, without complicating the device configuration and increasing the cost, Heat collected from can be used simultaneously, and multiple types of air conditioning equipment can be used comfortably.

  Also, during cooling operation, when using only the air conditioning equipment that directly uses the heat collected from the ground among the multiple types of air conditioning equipment, the heat exchange unit is stopped and the second heat exchange path is used. Therefore, since the operation can be realized only by the power consumption by circulating the heat medium directly from the piping group to the air conditioning equipment, the operation at a low running cost can be realized.

  In addition, since a large number of pipes embedded in the ground and circulating the heat medium are divided into a plurality of groups to form a plurality of pipe groups, it is used for heat exchange using a heat exchange unit during cooling operation of multiple types of air conditioning equipment. It is possible to use it divided into a piping group and a piping group for direct use without using a heat exchange unit. For this reason, a part of the plurality of pipe groups is used for a certain type of cooling and heating equipment, and a part used by the heat exchange unit for a different kind of cooling and heating equipment. It is possible to use other pipe groups other than this pipe group. Accordingly, it is possible to avoid using the heat medium whose temperature has been increased by the heat exchange unit as a refrigerant for direct use of the air conditioning equipment, and it is possible to comfortably use a plurality of types of air conditioning equipment. In short, when using geothermal heat, the piping that circulates the heat medium is divided into multiple groups, so that multiple types of air conditioning equipment can be used according to the temperature required by the air conditioning equipment. Can be used, and as a result, a balanced system as a whole can be achieved. At this time, it is possible to use a more appropriate piping group by switching the combination of the types of the air conditioning equipment.

  Moreover, since it is not assumed that the electric system used for a normal (currently commercially available general-purpose) heat exchange unit has two heat exchange paths as in the present invention, the general-purpose heat exchange unit cannot be used as it is. . Therefore, in the present invention, the heat exchange unit receives an input terminal for inputting a signal for switching an operation mode of cooling or heating, an air conditioner using the heat obtained by using the heat exchange unit in the cooling mode, and the ground. A terminal block having two systems of control input terminals for identifying air conditioning equipment that directly uses the collected heat; Thus, the implementation of the system of the present invention is facilitated by preparing an electrical system of a general-purpose heat exchange unit in advance.

  Furthermore, a plurality of piping groups used in the heat exchange unit are provided, and the plurality of piping groups can be selectively used according to the temperature condition of the heat medium received by the air conditioning equipment, for example, a heat medium whose temperature has increased in the heat exchange unit. In a situation where the underground temperature around the piping rises by continuing to circulate, the piping group that circulates the heat medium whose temperature has been increased by the heat exchange unit is changed from the piping group that has been used so far. By switching to another pipe group, the temperature of the heat medium returned to the heat exchange unit can be made available for heat exchange using the heat exchange unit, and the temperature has increased. The piping group can be rested for the next use. Thereby, geothermal heat can always be utilized for an air-conditioning apparatus in a usable state.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings.

  The geothermal heat-use cooling / heating system S according to the present embodiment is a system that uses geothermal heat for a plurality of types of air-conditioning equipment, and as shown in FIGS. 1 and 2, a heat exchange unit A and a plurality of piping groups B. The first heat exchange path C and the second heat exchange path D are provided. Then, a heat medium having two temperatures (for example, 7 ° C. and 15 ° C.) can be selectively supplied and simultaneously supplied during cooling, and a heat medium having one temperature (for example, 55 ° C.) can be supplied during heating. Hereinafter, the configuration of each part of the system and the operation of the system will be described in order.

[Configuration of underground heating and cooling system]
In this embodiment, two types of air-conditioning equipment 1 that blows warm air or cool air and a radiation-type air conditioning equipment 2 that radiates warm air or cold are illustrated as a plurality of types of air-conditioning equipment. The fan coil unit 1a is illustrated as the air conditioning equipment 1, and the floor heating panel 2a and the floor air conditioning unit 2b are illustrated as the radiation type air conditioning equipment 2.

  In addition, the fan coil unit 1a as the air-conditioning / heating device 1 of the air-blowing type has a function of dehumidifying the room by circulating water as a heat medium in a coil part (pipe part) in the unit and causing condensation in the coil part. Have. In addition, the water as a heat medium used here is water of the temperature which becomes below a dew point in an indoor environment. The dehumidifying function of the fan coil unit C1 exhibits the same ability as the dehumidifying function of a normal air conditioner. Further, it is possible to blow air (cooling with cold air or heating with hot air) by circulating water through the coil portion in the unit and rotating the fan through the coil portion.

  In addition, the floor heating panel 2a and the floor cooling / heating unit 2b as the radiation type cooling / heating device 2 appropriately warm or cool the floor surface by circulating the heat medium. As will be described in detail later, in this embodiment, the floor surface is appropriately cooled by directly circulating the heat (heat medium) collected from the ground to the floor cooling / heating unit 2b during the cooling, thereby generating condensation on the floor surface. It is possible to obtain a cool feeling without making it happen.

  The heat exchange unit A secures the temperature required by the air conditioning equipment 1 and 2 by heat exchange using underground heat. The heat exchange unit A includes a heat pump unit 11 that performs heat exchange, a primary-side circulation pump P1 that circulates a heat medium in a primary-side heat exchange unit 11a of the heat pump unit 11, and a secondary side of the heat pump unit 11 A secondary-side circulation pump P2 that circulates the heat medium in the heat exchange unit 11b is provided. Furthermore, the heat exchange unit A has a terminal block 13. The terminal block 13 will be described in detail later.

  When the heat pump unit 11 included in the heat exchange unit A wants to obtain a temperature higher than the heat collected from the ground (at the time of heating), the heat pump unit 11 is configured to vaporize a substance in the primary heat exchange unit 11a on the input side. The heat (temperature) required for heating is ensured by utilizing the heat absorbing action by utilizing the heat dissipating action when the substance is liquefied in the secondary heat exchange section 11b on the output side. On the other hand, when it is desired to obtain a temperature lower than the heat collected from the ground (at the time of cooling), the heat dissipating action when the substance is liquefied in the primary side heat exchange section 11a on the input side is changed to the secondary side on the output side. The heat (temperature) required for cooling is ensured by utilizing the endothermic action when the substance is vaporized in the side heat exchange section 11b. As described above, the heat pump unit 11 performs heat exchange by mutually utilizing the heat absorption action when the substance is vaporized or the heat release action when the substance is liquefied in the primary side heat exchange part 11a or the secondary side heat exchange part 11b. .

  The plurality of piping groups B are formed by dividing a large number of piping for burying in the ground and circulating the heat medium into a plurality of groups. The temperature in the ground is relatively stable throughout the year, is relatively stable, and is low in the summer relative to the outside temperature and high in the winter. A pipe for circulating the heat medium is buried in the ground, and heat exchange is performed with the soil in the ground through the pipe. In the present embodiment, as the plurality of pipe groups B, pipes 22 are arranged on the buried pipes 21 buried in the ground, and the buried pipes 21 on which the pipes 22 are arranged are divided into a plurality of groups. . In this embodiment, the structure which has two piping group B1, B2 which made two the buried pipes 21 with which piping 22 was distribute | arranged 1 group is illustrated.

  The plurality of pipe groups B are not limited to the combination of the buried pipe 21 and the pipe 22 shown in FIG. 1 and FIG. 2. For example, the pipe group B is directly buried in the ground. Any other configuration may be used as long as it can embed and circulate the heat medium to perform heat exchange. Moreover, in this embodiment, although the structure which has two piping group B1, B2 is illustrated as the some piping group B, the number of piping (or the embedded pipe | tube with which piping was arranged) which one group, The number of piping groups is appropriately set according to the situation or necessity, and is not limited to the above example.

  Moreover, water, oil, antifreeze, air etc. are mentioned as a heat medium which circulates in the piping. In addition, when filling the space for the heat exchange pipe and the buried pipe main body, as the filler, water, oil, antifreeze, sand, gravel, pulverized lightweight concrete, concrete, metal pieces, Examples include steel balls and stainless steel spheres.

  The first heat exchange path C is a heat exchange path that leads from the plurality of pipe groups B to the air conditioning equipment 1 and 2 via the heat exchange unit A. Between the primary side of the heat exchange unit A and the plurality of pipe groups B1 and B2, a primary side path 31 and a primary side branch path 32 branched from the primary side path 31 are provided. Further, a secondary side path 33 and a secondary side branch path 34 branched from the secondary side path 33 are provided between the secondary side of the heat exchange unit A and the air conditioners 1 and 2. Further, the secondary branch path 34 is provided with a header box 35, and a plurality of radiation type air conditioners 2 a and 2 b are connected to the header box 35. The header box 35 has a large number of branch pipes with respect to the mother pipe, and supplies heat to each of the plurality of radiation-type air conditioners 2a and 2b connected to each branch pipe (heat medium). Circulation) or heat supply can be cut off. Thus, the first heat exchange path C that can use the heat obtained by using the heat exchange unit A is configured.

  The second heat exchanging path D is a heat exchanging path that bypasses the heat exchanging unit A from the plurality of pipe groups B and is connected to the radiation type air conditioner 2. A bypass path 36 is provided between the primary side branch path 32 and the secondary side branch path 33. In the present embodiment, the heat exchange unit A is bypassed by the bypass path 36, and the pipe group B2 of the plurality of pipe groups B is connected to the header box 35 to which the radiation type air conditioners 2a and 2b are connected. A circulation path, that is, a second heat exchange path D that can directly use heat collected from the ground is configured.

  Further, in order to appropriately use the first heat exchange path C and the second heat exchange path D during heating and cooling, the following switching means MV1 to MV4 and a circulation pump P3 are provided. Three-way valves MV3 and MV4 serving as first switching means are provided at the connection portion between the primary branch path 32 and the bypass path 36. Further, two-way valves MV1 and MV2 serving as second switching means are provided between the secondary side branch path 34 and the bypass path 36. Further, the bypass path 36 is provided with a heat medium circulation pump P3.

  In addition, as described above, the heat exchange unit A has the terminal block 13. The terminal block 13 includes an input terminal 13a for inputting a signal from the cooling / heating switching switch 41 for switching the cooling or heating operation mode, and a cooling mode. It has two control input terminals 13b and 13c for identifying the air conditioning equipment 1 that uses heat obtained by using the heat exchange unit A and the air conditioning equipment 2 that directly uses heat collected from the ground. Yes. Further, the terminal block 13 is an output terminal for each member outside the heat exchange unit A, that is, an output terminal that outputs a switching signal to each switching means MV1 to MV4, and an output that outputs an ON / OFF signal for driving the pump P3. It has a terminal.

[Operation of underground heating and cooling system]
Operation | movement of the underground heat utilization cooling and heating system S which has the above structures is demonstrated. The geothermal heat-use cooling and heating system S according to the present embodiment is based on the signals input to the input terminal 13a of the terminal block 13 and the control input terminals 13b and 13c, by a control unit (not shown). It controls switching of each switching means MV1 to MV4 connected to each output terminal, driving ON / OFF of the pump P3, and further driving ON / OFF of the heat exchange unit A. Hereinafter, the operation in the cooling mode and the operation in the heating mode will be described in order.

<Cooling mode>
In the cooling mode, the switching means MV1 to MV4, the pump P3, and the heat exchange unit A are described below by a control unit (not shown) based on a combination of signals input to the two systems of control input terminals 13b and 13c. To be controlled.

  When operating the two types of air conditioning equipment 1 and 2 in the cooling mode, operation signals are input to the control input terminals 13b and 13c of the two systems. When this signal is input, a drive ON signal is output to each part of the heat exchange unit A (heat pump unit 11, pumps P1, P2), and a drive ON signal is output to the pump P3. At the same time, the two-way valves MV1, MV2 are switched to close, and the three-way valves MV3, MV4 are switched to open only the path from the pipe group B2 to the bypass path 36 (the primary side branch path 32 side is closed).

  Thereby, as shown in FIG. 1, among the two types of cooling and heating equipments 1 and 2, for the fan coil unit 1 a that is the blower type cooling and heating equipment 1, the piping group B <b> 1 of the plurality of piping groups B is used. And the heat (for example, 7 degreeC) obtained using the heat exchange unit A using the 1st heat exchange path | route C is supplied. The fan coil unit 1a is cooled by the heat obtained by using the heat exchange unit A, and dehumidifies and cools the room by causing condensation in the coil portion. At the same time, for the floor cooling / heating unit 2b, which is the radiation type heating / cooling device 2, heat exchange is performed using the pipe group B2 other than the pipe group B1 used by the heat exchange unit A and the second heat exchange path D. Heat (for example, 15 ° C.) collected from the ground without using the unit A is directly supplied. The floor cooling / heating unit 2b is cooled by the heat collected from the ground, and directly circulates the heat medium cooled in the ground to cool the floor without causing condensation. Therefore, the heat gained through the heat exchange unit A and the heat exchange unit A that are sufficiently practical for a plurality of types of air-conditioning equipment 1 and 2 can be passed without complicating the apparatus configuration and increasing the cost. Therefore, the heat collected from the ground can be used at the same time, and a plurality of types of air conditioning equipment 1 and 2 can be comfortably used.

  Generally, the cooling / heating device 1 for the purpose of blowing air or dehumidifying requires low-temperature cold water (heat medium) of 7 ° C. to 10 ° C., and the cooling / heating device 2 using cold radiation is about 15 ° C. to 20 ° C. A sufficient effect can be obtained with a heat medium. Therefore, the air cooled by the heat exchange unit A is supplied to the air conditioner 1 for the purpose of blowing or dehumidifying the cold air, and the heat collected from the ground is supplied to the air conditioner 2 using the cold radiation. By doing so, it is possible to comfortably use a plurality of types of air conditioning equipment while reducing energy consumption.

  When the operation of both the cooling and heating devices 1 and 2 is stopped (the same applies when both the cooling and heating devices are not operated), a stop signal is input to the control input terminals 13b and 13c of the two systems. When this signal is input, a drive OFF signal is output to each part of the heat exchange unit A, and a drive OFF signal is output to the pump P3. In addition, the state of each switching means MV1 to MV4 is the same as the state at the time of the two-temperature simultaneous supply described above.

  In the case where only one of the above two types of air conditioning devices 1 and 2 is operated, when only the air blower type air conditioning device 1 is operated, an operation signal is input only to the control input terminal 13b. Is done. When this signal is input, a drive ON signal is output only to each part of the heat exchange unit A. Note that the state of each of the switching means MV1 to MV4 is the same as the state at the time of the two-temperature simultaneous supply described above, and the pump P3 remains in the stopped state (drive OFF).

  Thereby, only the fan coil unit 1a which is the ventilation type air conditioning equipment 1 using the heat | fever obtained using the heat exchange unit A can be air-cooled.

  On the other hand, when operating only the radiation type air conditioner 2, the operation signal is input only to the control input terminal 13c. When this signal is input, a drive ON signal is output only to the pump P3. In addition, the state of each switching means MV1 to MV4 is the same as the state at the time of the two-temperature simultaneous supply described above, and each part of the heat exchange unit A remains in a stopped state (drive OFF).

  Thereby, only the radiation type air-conditioning equipment 2 that directly uses the heat collected from the ground without using the heat exchange unit A can be cooled. Therefore, when using only the cooling / heating device 2 that directly uses the heat collected from the ground among the plurality of types of cooling / heating devices 1, 2 during the cooling operation, the heat exchange unit A is stopped, and the bypass path Since the operation can be realized only by the power consumption of the circulation pump P3 arranged in the engine 36, the operation at a low running cost can be realized. Further, since the temperature of the cooled heat medium does not become too low, there is an advantage that a cool feeling can be obtained without causing condensation on the floor surface and inside the floor due to overcooling.

  In the present embodiment, the case where only the floor cooling / heating unit 2b of the plurality of radiation type cooling / heating devices 2a and 2b is cooled by switching the header box 35 is exemplified. However, the header box 35 is switched. Thus, the floor heating panel 2a can be simultaneously cooled, and only the floor heating panel 2a can be cooled.

<Heating mode>
On the other hand, in the heating mode, when operating the air conditioning units 1 and 2, the heat collected from the ground is generally about 15 ° C. to 20 ° C. and is not used directly, but the heat exchange unit A is used. The obtained heat (for example, 55 ° C.) is used for both the cooling and heating devices 1 and 2. For this reason, even if an operation signal is input to one or both of the control input terminals 13b and 13c of the two systems, only the heat exchange unit A in the first heat exchange path C is operated (drive ON), The pump P3 of the second heat exchange path D remains in a stopped state (drive OFF).

  The states of the switching means MV1 to MV4 are as follows.

  When operating two types of air-conditioning equipment 1 and 2, both the equipment 1 and 2 use the heat obtained by using the heat exchange unit A, so the two sides on the secondary side on which the air-conditioning equipment is arranged The valves MV1 and MV2 are switched to open. Further, the heat is supplied to the floor heating panel 2a and the floor cooling / heating unit 2b by switching the header box 35 disposed on the radiation type air conditioning equipment 2 side. Thereby, the heat obtained by using the heat exchange unit A is supplied to both the cooling and heating apparatuses 1 and 2.

  Even when only one of the two types of air conditioning devices 1 and 2 is operated, the secondary two-way valves MV1 and MV2 are switched to open. However, in the case of operating only the fan coil unit 1a which is the air-conditioning / heating device 1, the heat to the floor-heating panel 2a and the floor-heating / heating unit 2b which is the radiation-type air-conditioning device 2 by switching the header box 35. Is interrupted. As a result, when only the air-conditioning / heating device A is operated for heating, heat obtained by using the heat exchange unit A is supplied only to the air-conditioning / heating device A.

  In the heating mode, only the heat obtained by using the heat exchange unit A is used as described above. Therefore, the three-way valve MV3 on the primary side of the heat exchange unit A is used so that a plurality of piping groups B can be used. , MV4 is switched to open only the path from the pipe group B2 to the primary branch path 32 (close the bypass path 36 side).

  The fan coil unit 1a as the blower type air conditioner 1 blows and heats hot air generated by using the heat exchange unit A during heating operation. Similarly, the floor heating panel 2a and the floor cooling / heating unit 2b as the radiation type air conditioning equipment 2 also heat the floor by circulating a high-temperature heat medium through the heat exchange unit A during heating.

  As described above, according to the present embodiment, during the cooling operation, the heat obtained by using the heat exchange unit A for the air-conditioning / heating device 1 among the plurality of types of the cooling / heating devices 1 and 2. Since the heat collected from the ground is directly supplied to the radiation type air conditioner 2, it is possible to simultaneously use a suitable two-temperature heat medium according to the type of the air conditioner. . As a result, the heat obtained through the heat exchange unit A and the heat exchange unit A, which are sufficiently practical for a plurality of types of air-conditioning equipment 1 and 2 without complicating the device configuration and increasing the cost, can be obtained. The heat collected from the ground without passing through can be used at the same time, and a plurality of types of air conditioning devices 1 and 2 can be comfortably used.

  Further, during the cooling operation, when using only the radiation type cooling / heating device 2 that directly uses the heat collected from the ground among the plurality of types of cooling / heating devices 1, the heat exchange unit A is stopped. Since the operation can be realized only by the power consumption of the circulation pump P3 arranged in the bypass path 36 that bypasses the heat exchange unit A, the operation at a low running cost can be realized.

  In addition, since a large number of pipes embedded in the ground and circulating the heat medium are divided into a plurality of groups to form a plurality of pipe groups B, the heat exchange unit A is used during the cooling operation of a plurality of types of air conditioning units 1 and 2. The pipe group B1 used for the heat exchange and the pipe group B2 for direct use without using the heat exchange unit A can be used separately. As a result, it is possible to avoid using the heat medium whose temperature has been raised by the heat exchange unit as a refrigerant for direct use in the radiation-type air conditioner 2 during cooling, and comfortably use multiple types of air conditioners can do. In short, when using geothermal heat, the piping that circulates the heat medium is divided into multiple groups, so that multiple types of air conditioning equipment can be used according to the temperature required by the air conditioning equipment. Can be used, and as a result, a balanced system as a whole can be achieved. At this time, it is possible to use a more appropriate piping group by switching the combination of the types of the air conditioning equipment.

  In addition, it is not assumed that the electrical system used for a normal (currently commercially available) heat exchange unit has two heat exchange paths as in this embodiment, so the general-purpose heat exchange unit is used as it is. Can not. Therefore, in this embodiment, as described above, the heat exchange unit A receives the input terminal 13a for inputting a signal for switching the cooling or heating operation mode, and the heat obtained by using the heat exchange unit A in the cooling mode. A terminal block 13 having two systems of control input terminals 13b and 13c for discriminating between a blowing type air conditioning apparatus 1 to be used and a radiation type air conditioning apparatus 2 that directly uses heat collected from the ground is provided in advance. is doing. As described above, by preparing an electric system of a general-purpose heat exchange unit in advance, the system of the present embodiment can be easily implemented.

  In the above-described embodiment, the two-way valves MV1 and MV2 are provided between the secondary branch path 34 and the bypass path 41 as the secondary switching means on the secondary side that is the side where the air conditioning equipment is disposed. Although the configuration is exemplified, the configuration is not limited to this, and for example, a configuration in which the three-way valves MV1 and MV2 are provided at the connection portion between the secondary side branch path 34 and the bypass path 21 may be employed. In this case, the three-way valves MV1 and MV2 are switched so as to open only the path from the bypass path 36 to the radiation type air conditioner 2 during cooling (the secondary side branch path 34 side is closed). Only the path from the secondary branch path 34 to the radiation type air conditioner 2 is opened (the bypass path 36 side is closed). Other configurations and operations are the same as those of the above-described embodiment. Also with this configuration, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the case where the number of pipe groups used for the heat exchange unit during cooling is illustrated as an example, but the present invention is not limited thereto, and the number of pipe groups used for the heat exchange unit is plural. The plurality of piping groups may be selectively usable depending on the temperature condition of the heat medium received by the air-conditioning / heating device. With this configuration, for example, in a situation where the underground temperature around the piping rises by continuing to circulate the heat medium whose temperature has increased in the heat exchange unit, the heat medium whose temperature has increased in the heat exchange unit is circulated. By switching the piping group to be switched to another piping group of the plurality of piping groups, the temperature of the heat medium returned to the heat exchange unit again is made available for heat exchange using the heat exchange unit. In addition, the piping group whose temperature has risen can be rested for the next use. Therefore, the air conditioning equipment can be used comfortably.

  Moreover, in embodiment mentioned above, although the fan coil unit 1a was illustrated as the ventilation type air conditioning apparatus 1, and the floor heating panel 2a and the floor heating unit 2b were illustrated as the radiation type air conditioning apparatus 2, it is not limited to this. For example, in the above-described embodiment, the air-conditioning equipment for the air blow type is not limited to the floor as the air-conditioning equipment for the radiation type, and the air-conditioning equipment for piping the wall, ceiling, roof, etc. and circulating the above-described heat medium through the pipe. It may be other than the exemplified air conditioning equipment. The present invention described above is also effective in an air conditioning system that uses these air conditioning equipment in appropriate combination.

  As an application example of the present invention, it can be applied to energy-saving air conditioning by floor cooling in an open space in an office building, public building, etc. as well as a house, and in an office building, public building, etc. that has only a heating system It is possible to expand the reform.

It is a model explanatory view of the underground heat utilization cooling and heating system concerning an embodiment of the invention. It is a model explanatory view of the underground heat utilization cooling and heating system concerning an embodiment of the invention.

Explanation of symbols

A ... Heat exchange unit B ... Plural pipe groups B1, B2 ... Pipe group C ... First heat exchange path D ... Second heat exchange path MV1, MV2, MV3, MV4 ... Switching means P1 ... Primary side circulation pump P2 ... Secondary side circulation pump P3 ... Circulation pump S ... Geothermal heat-use air conditioning system 1 ... Blower type air conditioner 1a ... Fan coil unit 2 ... Radiant type air conditioner 2a ... Floor heating panel 2b ... Floor air conditioning unit 11 ... Heat pump unit 11a ... primary side heat exchange part 11b ... secondary side heat exchange part 13 ... terminal block 13a ... input terminals 13b and 13c ... control input terminal 21 ... buried pipe 22 ... pipe 31 ... primary side path 32 ... primary side branch path 33 ... Secondary side path 34 ... Secondary side branch path 35 ... Header box 36 ... Bypass path 41 ... Air conditioning switching switch

Claims (3)

A geothermal heat-use air conditioning system that uses geothermal heat for multiple types of air-conditioning equipment,
A heat exchange unit that secures the temperature required by the air-conditioning equipment through heat exchange using geothermal heat;
A plurality of pipe groups, each of which is divided into a plurality of groups, embedded in the ground and circulating a heat medium;
A first heat exchange path that leads from the plurality of piping groups to the air conditioning equipment via the heat exchange unit;
A second heat exchange path that bypasses the heat exchange unit from the plurality of pipe groups and is directly connected to the air conditioning equipment;
Have
During cooling operation of a plurality of types of cooling and heating equipment, among a plurality of types of cooling and heating equipment, for some types of cooling and heating equipment, a part of the plurality of piping groups and the first heat exchange path are used. For the air conditioning equipment of a kind different from the air conditioning equipment, other pipes other than a part of the pipe group used by the heat exchange unit An underground heating / cooling system using ground heat, which is capable of directly supplying heat collected from the ground without using the heat exchange unit using the group and the second heat exchange path.   The heat exchange unit directly uses an input terminal for inputting a signal for switching an operation mode of cooling or heating, an air conditioner using heat obtained by using the heat exchange unit in the cooling mode, and heat collected from the ground. 2. The geothermal heat-use air conditioning system according to claim 1, further comprising a terminal block having two control input terminals for identifying air conditioning equipment to be operated.   2. The underground according to claim 1, wherein a plurality of pipe groups are used for the heat exchange unit, and the plurality of pipe groups can be selectively used according to a temperature condition of a heat medium received by the air conditioning equipment. Heat-use air conditioning system.

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