JP6697891B2 - Heat utilization system - Google Patents

Description

  The present invention relates to a heat utilization system including a plurality of heat utilization units.

  The heat utilization system supplies heat source water from the heat source unit to each of the plurality of heat utilization units, and uses the heat of the heat source water in each of the plurality of heat utilization units to perform heating operation, cooling operation, etc. The air conditioning operation is performed (see Patent Document 1).

  The system described in Patent Document 1 includes a high-temperature system capable of supplying high-temperature heat source water to each of the plurality of heat utilization units and a low-temperature system capable of supplying low-temperature heat source water to each of the plurality of heat utilization units. Has been. When the heat utilization unit performs a heating operation, the heat source water of the high temperature system is taken in, the heat source water is used as a heat source for heating, and the used heat source water is supplied to the low temperature system. Further, when the heat utilization unit is in the cooling operation, the heat source water of the low temperature system is taken in, the heat source water is used as a cold heat source for cooling, and the used heat source water is supplied to the high temperature system.

  Thereby, for example, when the heat utilization part for heating operation and the heat utilization part for cooling operation coexist, the heat source water after use in the heat utilization part for heating operation is used in the heat utilization part for cooling operation. The heat source water that has been used in the cooling-use heat utilization unit is used in the heating-use heat utilization unit. Therefore, the heat source water once used in the heat utilization unit can be used in another heat utilization unit while the air conditioning operation is performed in the plurality of heat utilization units, and energy saving can be achieved.

JP, 2007-315621, A

  The system described in Patent Document 1 includes a bypass pipe that connects the high-temperature system and the low-temperature system, and heat source water can flow between the high-temperature system and the low-temperature system through the bypass pipe.

  When the heating load is larger than the cooling load in the plurality of heat utilization units, a large amount of heat source water is used in the high temperature system, so that the heat source water flows from the low temperature system to the high temperature system through the bypass pipe. Then, when the temperature of the heat source water in the bypass pipe falls and reaches a predetermined temperature on the lower side, a heating operation to heat the heat source water on the low temperature system side and supply it to the high temperature system side in order to cover the heating load. I do.

  On the contrary, when the cooling load is larger than the heating load in the plurality of heat utilization units, the heat source water of the low temperature system is used more, so that the heat source water flows from the high temperature system to the low temperature system through the bypass pipe. Then, when the temperature of the heat source water in the bypass pipe rises and reaches a predetermined temperature on the rising side, a cooling operation of cooling the heat source water on the high temperature system side and supplying it to the low temperature system side in order to cover the cooling load. I do.

  However, in the system described in Patent Document 1, the minimum flow rate of the heat source water is circulated through the bypass pipe in order to detect the temperature of the heat source water in the bypass pipe. And the heat source water of the low temperature system are mixed. Due to this mixing, the temperature of the heat source water in the high temperature system drops, and conversely, the temperature of the heat source water in the low temperature system rises, causing energy loss.

  In view of this actual situation, the main problem of the present invention is to suppress the mixing of heat source water between the high temperature system and the low temperature system, reduce energy loss, and provide a heat utilization system capable of further energy saving. It is in the point of providing.

A first characteristic configuration of the present invention is a heat utilization system including a plurality of heat utilization units,
A high-temperature system capable of supplying high-temperature heat source water to each of the plurality of heat utilization units,
A low temperature system capable of supplying low temperature heat source water to each of the plurality of heat utilization units,
A cooling operation of cooling the heat source water supplied from the high temperature system side and supplying it to the low temperature system side, and a heating operation of heating the heat source water supplied from the low temperature system side and supplying it to the high temperature system side. With a viable heat source,
Each of the plurality of heat utilization units, utilizing the heat source water of the high temperature system, a high temperature utilization state of supplying the heat source water after utilization to the low temperature system, and utilizing the heat source water of the low temperature system, utilization It is configured to be switchable to a low-temperature utilization state in which the heat source water after that is supplied to the high-temperature system,
Heat source water is arranged on the heat source side from which the high temperature system side or the low temperature system side is supplied to the heat source unit, and a part of the heat source water is branched and supplied to the low temperature system side or the high temperature system side. Fork road,
A heat source water flow state detection unit for detecting the flow state of the heat source water in the branch passage,
Based on the detection information of the heat source water flow state detection unit, a control unit for controlling the operating state of the heat source unit is provided ,
One end side of the branch path is connected to the high temperature system, and the other end side of the branch path is connected to the low temperature system,
A detection flow path is provided, one end of which is connected to one side of the branch path connected to the high temperature system, and the other end of which is connected to the other side of the branch path connected to the low temperature system. ,
The flow path for detection is provided with the heat source water flow state detection unit,
The heat source water circulation state detection unit detects the temperature of the heat source water, the flow rate of the heat source water, and the circulation direction of the heat source water as the circulation state of the heat source water .

  According to this configuration, when the heat utilization part in the high temperature utilization state and the heat utilization part in the low temperature utilization state coexist, the heat source water used in the heat utilization part in the high temperature utilization state is used at the low temperature utilization. The heat source water in the high temperature utilization state can be used by the heat utilization unit in the high temperature utilization state, and the heat source water used in the heat utilization unit in the low temperature utilization state can be utilized by the heat utilization unit in the high temperature utilization state.

  Then, for example, when the heat utilization part in the high temperature utilization state becomes larger than the heat utilization part in the low temperature utilization state and the heating load becomes larger than the cooling load, the amount of heat source water in the low temperature system increases, and the heat source in the high temperature system is increased. The amount of water decreases. As a result, the heat source water flows from the low temperature system side to the branch path and is supplied to the heat source section, and the heat source water that has passed through the heat source section is supplied to the high temperature system side through the branch path. On the contrary, when the heat utilization part in the low temperature utilization state becomes larger than the heat utilization part in the high temperature utilization state and the cooling load becomes larger than the heating load, the amount of heat source water in the high temperature system increases and the heat source water in the low temperature system increases. Therefore, the heat source water flows from the high temperature system side to the branch path to be supplied to the heat source section, and the heat source water that has passed through the heat source section is supplied to the low temperature system side to the branch path. Further, when the number of heat utilization parts in the high temperature utilization state and the heat utilization part in the low temperature utilization state are the same and the heating load and the cooling load are the same or substantially the same, the heat source water of both the high temperature system and the low temperature system The amount does not change, and the heat source water does not flow through the branch path and the heat source section.

  In this way, the presence or absence of circulation of the heat source water in the branch passage and the distribution direction thereof change depending on the use status of the heat in the plurality of heat utilization units. Therefore, the heat source water circulation state detection unit detects the circulation state of the heat source water in the branch passage. By detecting the, it is possible to grasp the heat utilization status in the plurality of heat utilization units. Therefore, the control unit controls the operating state of the heat source unit based on the detection information of the heat source water circulation state detecting unit, and, for example, when the heating load and the cooling load are the same or substantially the same, It is possible to appropriately heat and cool the heat source unit according to the use status of heat in the plurality of heat use units, such as stopping the operation. Therefore, while it is possible to use the heat source water in both the heat utilization section in the high temperature utilization state and the heat utilization section in the low temperature utilization state, it is possible to effectively save energy without wastefully heating or cooling the heat source section. Can be achieved.

  Moreover, when the heat source water flows through the branch path, either the heat source water flows from the low temperature system side or the heat source water flows from the high temperature system side. It is possible to grasp the utilization status of heat in a plurality of heat utilization units by the circulation state of the heat source water in the branch path while suppressing energy loss without mixing with the heat source water.

This onset bright, depending on the magnitude of the thermal load on the heat utilization unit, a flow rate adjusting unit for adjusting the flow rate of the heat source water supplied to the heat utilization unit is preferable that is provided.

According to this configuration, a large amount of heat source water is supplied to the heat utilization unit having a large heat load, and a small amount of heat source water is supplied to the heat utilization unit having a small heat load. Thereby, when a difference in magnitude between the heating load and the cooling load in the plurality of heat utilization units occurs, a difference in the heat load occurs as a difference in the amount of heat source water between the high temperature system and the low temperature system, Due to the difference in the amount of the heat source water, circulation of the heat source water in the branch path occurs. Therefore, only by detecting the circulation state of the heat source water in the branch passage by the heat source water circulation state detection unit, it is possible to appropriately grasp the heat utilization state in the plurality of heat utilization units.
A second characteristic configuration of the present invention is that the detection flow path is provided with one heat source water flow state detection unit.

  In a third characteristic configuration of the present invention, an unused energy heat source that uses unused energy and an auxiliary heat source are provided as heat sources in the heat source unit, and a heat source water temperature detection unit that detects the temperature of the heat source water in the branch path is provided. It is provided, and the control unit controls the operating state of the heat source unit in a form of preferentially using the unused energy heat source over the auxiliary heat source based on the detection information of the heat source water temperature detection unit. It is in.

  According to this configuration, the unused energy heat source and the auxiliary heat source are provided, and since the unused energy heat source is used in preference to the auxiliary heat source, the unused energy heat source is used as much as possible to achieve energy saving, For example, even when the heat load is large, the heat load can be sufficiently covered by using the auxiliary heat source.

  A fourth characteristic configuration of the present invention is that the heat source section includes a heat source heat exchange section for exchanging heat between a heat carrier circulatingly supplied from the heat source and heat source water.

  According to this configuration, the high temperature system and the low temperature system can be separated into the system side in which the heat source water flows and the heat source section side in which the heat carrier flows. As a result, even if a pressure change occurs on the heat source side due to a change in the flow state of the heat transfer body such as a change in the flow rate of the heat transfer body, the influence does not affect the system side. Therefore, on the system side, since the heat source water is circulated regardless of the circulation state of the heat carrier on the heat source side, the circulation state of the heat source water is appropriately set according to the heat utilization state in the plurality of heat utilization units. As a result, the heat utilization statuses of the plurality of heat utilization units can be grasped more appropriately.

  A fifth characteristic configuration of the present invention is a heat source water flow rate detection unit that detects a flow rate of heat source water in the branch passage, and a heat source heat exchange unit from the heat source based on detection information of the heat source water flow rate detection unit. A heat carrier flow rate adjusting unit that adjusts the flow rate of the heat carrier to be circulated and supplied is provided.

  According to this configuration, by adjusting the flow rate of the heat carrier circulatingly supplied from the heat source to the heat exchange section for heat source in accordance with the flow rate of the heat source water in the branch path, the heat is transferred to the heat exchange section for heat source by the branch path. A heat carrier having a flow rate sufficient for heat exchange with respect to the flow rate of the heat source water can be supplied to the heat source heat exchanging unit without excess or deficiency, and heat exchange in the heat source heat exchanging unit can be appropriately performed.

Overall schematic diagram of heat utilization system Overall schematic diagram of heat utilization system Overall schematic diagram of heat utilization system Overall schematic diagram of heat utilization system Overall schematic diagram of heat utilization system

An embodiment of a heat utilization system according to the present invention will be described with reference to the drawings.
1 to 5 show the overall schematic configuration of the heat utilization system, and only the parts through which the heat source water and the heat carrier flow are different.

First, the overall configuration of the heat utilization system will be described with reference to FIG.
This heat utilization system includes a plurality of heat utilization units 3, a high temperature system 1 capable of supplying high-temperature heat source water (heat source water having a high temperature set temperature) to each of the plurality of heat utilization units 3, and a plurality of heat utilization units. A low temperature system 2 capable of supplying low temperature heat source water (heat source water having a low temperature set temperature) to each of 3 and a heat source unit 4 capable of controlling the temperature of the heat source water of the high temperature system 1 and the low temperature system 2.

  The heat utilization unit 3 is composed of, for example, an air conditioner installed in a building, and one air conditioner is configured as the heat utilization unit 3, or a plurality of air conditioners in the entire building or in a certain area is used as the heat utilization unit. 3 can be configured. A plurality of heat utilization units 3 are connected in parallel to the high temperature system 1, and the heat source water of the high temperature system 1 formed in a loop shape can be supplied to all the heat utilization units 3. Similarly, a plurality of heat utilization units 3 are connected in parallel to the low temperature system 2, and the heat source water of the low temperature system 2 formed in a loop is configured to be freely supplied to all the heat utilization units 3. There is.

  Each of the plurality of heat utilization units 3 takes in the heat source water of the high temperature system 1 from the high temperature system 1 and uses it for heat, and supplies the used heat source water to the low temperature system 2 in a high temperature utilization state and the heat source water of the low temperature system 2. Is taken from the low-temperature system 2 to utilize the heat, and the heat source water after use can be switched to a low-temperature utilization state in which it is supplied to the high-temperature system 1. For example, the heat utilization unit 3 performs a heating operation in which the heat source water of the high temperature system 1 is used as a heat source in the high temperature utilization state, and a cooling operation in which the heat source water of the low temperature system 2 is utilized as a cold heat source in the low temperature utilization state. To do.

  In each of the plurality of heat utilization units 3, a forward path 31 that supplies the heat source water from the high temperature system 1 and the low temperature system 2 to the heat utilization unit 3 and the heat source water after the heat utilization in the heat utilization unit 3 is used in the high temperature system. 1 and the low temperature system 2 return path 32, the heat utilization side switching valve 33 for switching the connection state of the outward path 31 and the return path 32 to the high temperature system 1 and the low temperature system 2, and the heat source water supplied to the heat utilization unit 3. And a flow rate adjusting pump 34 (corresponding to a flow rate adjusting unit) for adjusting the flow rate of.

  The heat utilization side switching valve 33 connects the outward path 31 to the high temperature system 1 and connects the return path 32 to the low temperature system 2 in a high temperature supply state, and connects the outward path 31 to the low temperature system 2 and connects the return path 32 to the high temperature system 1. It can be switched to the low temperature supply state. When the heat utilization unit 3 is switched to the high temperature utilization state, the heat utilization side switching valve 33 is switched to the high temperature supply state, and when the heat utilization unit 3 is switched to the low temperature utilization state, the heat utilization side switching valve 33 is switched to the high temperature utilization state. Switching to the low temperature supply state.

  The flow rate adjustment pump 34 is configured to be able to adjust the flow rate of the heat source water supplied to the heat utilization unit 3, for example, by adjusting the output thereof. Then, the flow rate adjusting pump 34 is configured to adjust the flow rate of the heat source water supplied to the heat utilizing unit 3 according to the magnitude of the heat load on the heat utilizing unit 3. That is, the flow rate adjustment pump 34 increases the flow rate of the heat source water supplied to the heat utilization unit 3 as the heat load of the heat utilization unit 3 increases.

  The heat source unit 4 performs a cooling operation for cooling the heat source water on the high temperature system 1 side and supplying it to the low temperature system 2 side, and a heating operation for heating the heat source water on the low temperature system 2 side and supplying it to the high temperature system 1 side. It is configured to be possible.

  In order to supply the heat source water of the high temperature system 1 or the low temperature system 2 to the heat source section 4, a branch path 5 having one end side connected to the high temperature system 1 and the other end side connected to the low temperature system 2 is provided, and the branch path 5 Of the heat source water, the temperature of the heat source water, and the flow rate of the heat source water in the heat source water detection unit 6 (corresponding to the heat source water circulation state detection unit, the heat source water temperature detection unit, and the heat source water flow rate detection unit). ) Is provided.

  The branch path 5 is arranged on the heat source section 4 side where the heat source water is supplied to the heat source section 4 from the high temperature system 1 side or the low temperature system 2 side, and a part of the heat source water is branched and circulated to the low temperature system 2 side or the high temperature side. It is configured to supply to the system 1 side. When the heat source water flows from the high temperature system 1 side to the branch path 5, the branch path 5 supplies the heat source water to the heat source section 4, and supplies the heat source water passing through the heat source section 4 to the low temperature system 2 side. .. On the contrary, when the heat source water flows from the low temperature system 2 side to the branch path 5, the branch path 5 supplies the heat source water to the heat source section 4, and the heat source water passing through the heat source section 4 is supplied to the high temperature system 1 side. Supply to.

  The heat source water detection unit 6 is composed of, for example, a calorimeter, and has one end connected to one side of the branch path 5 and the other end connected to the other side of the branch path 5a for detection. In addition to the temperature of the heat source water and the flow rate of the heat source water, the presence or absence of the flow of the heat source water in the branch path 5 and the flow direction thereof are detected as the circulation state of the heat source water. By the way, the heat source water detection unit 6 is not limited to the calorimeter, and includes a detection sensor for a circulation state that detects the circulation state of the heat source water, a temperature detection sensor that detects the temperature of the heat source water, and a flow rate of the heat source water. It is also possible to separately provide a detection sensor for the flow rate to be detected.

  The heat source unit 4 includes an unused energy heat source 41 that uses unused energy and an auxiliary heat source 42 as heat sources. As the unused energy, it is possible to apply various kinds of heat that have not been used until now, such as underground heat, river water heat, sewage heat, cold heat generated from a low temperature outside air by a cooling tower or the like. By the way, when there are a plurality of heat sources as the unused energy heat source 41, it is configured such that which of the plurality of heat sources is used can be freely selected. It is possible to select which heat source is used depending on whether to heat or cool.

  The heat source part 4 circulates and supplies the heat carrier for heat source 43 from the unused energy heat source 41 to the heat exchanger 43 for unused heat source, which exchanges heat between the heat carrier and the heat source water circulated and supplied from the heat source. An unused side circulation supply path 44 and an auxiliary side circulation supply path 45 for circulating and supplying the heat carrier from the auxiliary heat source 42 to the heat exchange unit 43 for heat source are provided.

  In the cooling operation, the unused energy heat source 41 and the auxiliary heat source 42 are switched to a cold heat supply state in which cold heat is supplied to the heat source heat exchange section 43 by the low temperature heat carrier, and in the heating operation, the high energy heat carrier is changed. The heat is supplied to the heat exchanging section 43 for heat source to be switched to the heat supplying state.

  The heat source heat exchange section 43 has one side connected to the high temperature system 1 and the other side connected to the low temperature system 2. When the heat source water flows from the high temperature system 1 side to the heat source heat exchange unit 43, the heat source water is heat-exchanged in the heat source heat exchange unit 43, and the heat source water after the heat exchange is supplied to the low temperature system 2 side. To do. On the contrary, when the heat source water flows from the low temperature system 2 side to the heat source heat exchanging unit 43, the heat source water is heat-exchanged in the heat source heat exchanging unit 43, and the heat source water after the heat exchange is used in the high temperature system 1 Supply to the side.

  In the unused side circulation supply path 44, an unused side flow rate adjusting pump 49 (corresponding to a heat carrier flow rate adjusting section) for adjusting the flow rate of the heat carrier circulatingly supplied from the unused energy heat source 41 to the heat source heat exchange section 43. Is provided. The auxiliary side circulation supply path 45 is provided with an auxiliary side flow rate adjusting pump 50 (corresponding to a heat carrier flow rate adjusting section) that adjusts the flow rate of the heat carrier circulatingly supplied from the auxiliary heat source 42 to the heat source heat exchange section 43. Has been.

  The unused-side circulation supply passage 44 and the auxiliary-side circulation supply passage 45 are constituted by connection passage portions 44a and 45a which also serve as passage portions connected to the heat source heat exchange section 43. A first three-way valve 46 and a second three-way valve 47 are provided at the ends of the dual-use connection flow passage portions 44a and 45a. By the first three-way valve 46 and the second three-way valve 47, an unused side supply state in which the heat carrier is circulated and supplied from the unused energy heat source 41 to the heat source heat exchange section 43 in the unused side circulation supply path 44, Auxiliary side supply state in which the heat carrier is circulated and supplied from the auxiliary heat source 42 to the heat source heat exchange section 43 in the auxiliary side circulation supply path 45, and the unused energy heat source 41 to the heat source heat in the unused side circulation supply path 44. The heat transfer body is circulated and supplied to the exchange section 43, and the auxiliary side circulation supply passage 45 is configured to be switchable to a combined use state in which the heat transfer body is circulated and supplied from the auxiliary heat source 42 to the heat source heat exchange section 43. There is.

  The dual-use connection flow path portions 44a and 45a are provided with a heat source side switching valve 48 that switches the flow direction of the heat carrier in the heat source heat exchange section 43. By switching the flow direction of the heat carrier by the heat source side switching valve 48, the heat carrier supplied from the unused energy heat source 41 and the auxiliary heat source 42 and the heat source water face each other in the heat source heat exchange section 43. It is configured to exchange heat in a circulating state.

The operation mode of the heat utilization system will be described below.
The heat utilization system is provided with a control unit 7 that controls the operating state of the heat source unit 4 and the like.
When a heating request is made, each of the plurality of heat utilization units 3 is switched to a high temperature utilization state to operate to cover the heating load, and when a cooling request is made, it is switched to a low temperature utilization state to operate to cover the cooling load. There is. The control unit 7 determines how the heat utilization status of the plurality of heat utilization units 3 as a whole, such as which of the heating load and the cooling load is greater in the plurality of heat utilization units 3 and the magnitude of the heat load. The operating state of the heat source unit 4 is controlled by grasping that It demonstrates based on FIGS. 1-5 in which the utilization condition of heat differs.

  In the intermediate period except for summer and winter, there is a case where a heating request and a cooling request are mixed such that there is a heating request at one place and a cooling request at another place. First, the case where the heating request and the cooling request are mixed will be described with reference to FIGS. 1 to 3.

  In the heat utilization unit 3 in the high temperature utilization state, the heat utilization side switching valve 33 is switched to the high temperature supply state, the flow rate adjustment pump 34 is operated, and the heat source water of the high temperature system 1 is taken in and utilized, and the heat source water after utilization is used. Is supplied to the low temperature system 2. At this time, the flow rate adjusting pump 34 increases the flow rate of the heat source water to be supplied to the heat utilization part 3 as the heat load of the heat utilization part 3 is larger. According to the above, the flow rate of the heat source water supplied to the heat utilization unit 3 is adjusted.

  On the contrary, in the heat utilization unit 3 in the low temperature utilization state, the heat utilization side switching valve 33 is switched to the low temperature supply state, the flow rate adjustment pump 34 is operated, and the heat source water of the low temperature system 2 is taken in and utilized as heat. The heat source water is supplied to the high temperature system 1. At this time, the flow rate adjusting pump 34 increases the flow rate of the heat source water to be supplied to the heat utilization part 3 as the heat load of the heat utilization part 3 is larger. According to the above, the flow rate of the heat source water supplied to the heat utilization unit 3 is adjusted.

  Here, in FIG. 1, the heat utilization unit 3 in the low temperature utilization state (three heat utilization units 3 located on the upper side in the figure) and the heat utilization unit 3 in the high temperature utilization state (1 located at the lowest side in the figure) This shows a case where the three heat utilization units 3) are mixed and the cooling load is larger than the heating load.

  In this case, since the cooling load is larger than the heating load, the amount of heat source water taken from the low temperature system 2 into the heat utilization unit 3 in the low temperature utilization state and supplied to the high temperature system 1 is used from the high temperature system 1 at high temperature. The amount of the heat source water taken into the heat utilization unit 3 in the state and supplied to the low temperature system 2 becomes larger than the amount. As a result, the amount of heat source water in the high temperature system 1 increases and the amount of heat source water in the low temperature system 2 decreases, so that the heat source water flows from the high temperature system 1 side to the low temperature system 2 side with respect to the branch path 5. The heat source water of the high temperature system 1 that has circulated is supplied to the heat source heat exchange section 43 of the heat source section 4 through the branch path 5. Therefore, when the heat source water detection unit 6 detects that the heat source water flows from the high temperature system 1 side to the low temperature system 2 side, the control unit 7 switches the heat sources 41 and 42 to the cold heat supply state, and the heat source unit. 4. Cool down 4.

  When the control unit 7 performs the cooling operation of the heat source unit 4, based on the temperature of the heat source water detected by the heat source water detection unit 6, the unused energy heat source 41 is used in preference to the auxiliary heat source 42. The operating state of the heat source unit 4 is controlled. FIG. 1 shows a case where the unused energy heat source 41 is used to cool the heat source unit 4.

  In the unused energy heat source 41, the temperature of the heat source may change depending on various conditions. Therefore, thermal information such as the temperature of the heat source can be obtained by using a temperature detection unit or the like. It is managed. Therefore, the control unit 7 can obtain the heat information of the unused energy heat source 41, compare the heat information with the temperature of the heat source water detected by the heat source water detection unit 6, and use the unused energy heat source 41. It is determined whether or not.

  For example, if the temperature of the unused energy heat source 41 is lower than the temperature of the heat source water detected by the heat source water detection unit 6, the control unit 7 determines that the unused energy heat source 41 can be used, and determines the first three-way valve. 46 and the second three-way valve 47 to switch to the unused side supply state. In this unused side supply state, the unused side flow rate adjustment pump 49 is operated to circulate and supply the heat carrier from the unused energy heat source 41 to the heat source heat exchange section 43 in the unused side circulation supply path 44, In the heat exchange unit for heat source 43, the heat source water is cooled by the heat carrier having the cold energy of the unused energy heat source 41.

  Further, for example, if the temperature of the unused energy heat source 41 is equal to or higher than the temperature of the heat source water detected by the heat source water detection unit 6, the control unit 7 determines that the unused energy heat source 41 cannot be used, and the first The three-way valve 46 and the second three-way valve 47 are switched to the auxiliary side supply state. In this auxiliary-side supply state, the auxiliary-side flow rate adjustment pump 50 is operated, and the heat carrier is circulated and supplied from the auxiliary heat source 42 to the heat-source heat exchange section 43 through the auxiliary-side circulation supply path 45, and the heat-source heat exchange section is supplied. At 43, the heat source water is cooled by the heat carrier having the cold heat of the auxiliary heat source 42.

  The control unit 7 does not use the heat source water detection unit 6 not only at the beginning when it detects that the heat source water is flowing from the high temperature system 1 side to the low temperature system 2 side, but also after each set period elapses. It is also possible to repeatedly perform the process of comparing the heat information of the energy heat source 41 and the temperature of the heat source water detected by the heat source water detector 6 to determine whether or not the unused energy heat source 41 can be used. By repeating this, when the unused energy heat source 41 is changed to the usable state when the auxiliary heat source 42 is being used, the unused energy heat source 41 can be switched to the usable state according to the state change. ..

  As described above, the invention is not limited to switching to the single use state in which only the unused energy heat source 41 is used and the single use state in which only the auxiliary heat source 42 is used. For example, when the unused energy heat source 41 can be used, the unused energy heat source 41 is not used. The energy heat source 41 and the auxiliary heat source 42 may be used together. In this case, the control unit 7 controls the unused-side flow rate adjustment pump 49 and the auxiliary-side flow rate adjustment pump 50 to flow the heat carrier from the unused energy heat source 41 to the heat source heat exchange unit 43. Is greater than the flow rate of the heat carrier circulatingly supplied from the auxiliary heat source 42 to the heat source heat exchange section 43, the unused energy heat source 41 can be used in preference to the auxiliary heat source 42.

  When cooling the heat source unit 4, the control unit 7 controls the heat carrier that circulates from the heat sources 41 and 42 to the heat source heat exchange unit 43 based on the flow rate of the heat source water detected by the heat source water detection unit 6. The unused side flow rate adjusting pump 49 and the auxiliary side flow rate adjusting pump 50 are controlled so as to adjust the flow rate.

  As the flow rate of the heat source water detected by the heat source water detection unit 6 increases, the heat source water flowing through the heat source heat exchange unit 43 also increases. Therefore, when the unused energy heat source 41 is used, the control unit 7 increases the output of the unused side flow rate adjustment pump 49 to increase the flow rate of the heat carrier that is circulated and supplied from the unused energy heat source 41 to the heat source heat exchange section 43. When the auxiliary heat source 42 is used, the control unit 7 increases the output of the auxiliary-side flow rate adjustment pump 50 to control the flow rate of the heat carrier that is circulated and supplied from the auxiliary heat source 42 to the heat source heat exchange unit 43. Is increasing. In this manner, the heat exchange unit for heat source 43 can supply the heat carrier of a sufficient flow rate for heat exchange with respect to the flow rate of the circulating heat source water without excess or deficiency, and Heat exchange can be performed properly.

  Further, when the heat source unit 4 is cooled, the control unit 7 adjusts the flow direction of the heat carrier in the heat source heat exchange unit 43 by the heat source side switching valve 48. The control unit 7 is arranged such that the circulation direction of the heat carrier from the heat sources 41 and 42 is opposed to the circulation direction of the heat source water from the high temperature system 1 side to the low temperature system 2 side in the heat source heat exchange unit 43. The heat source side switching valve 48 is switched.

  In FIG. 2, the heat utilization part 3 in the high temperature utilization state (three heat utilization parts 3 located on the upper side in the figure) and the heat utilization part 3 in the low temperature utilization state (one heat utilization located in the lowermost side in the figure) 3) and the heating load is larger than the cooling load. The operation of the heat utilization unit 3 at this time is the same as that described above.

  In this case, since the heating load is larger than the cooling load, the amount of heat source water taken from the high temperature system 1 to the heat utilization unit 3 in the high temperature utilization state and supplied to the low temperature system 2 is used from the low temperature system 2 at low temperature. The amount of the heat source water taken into the heat utilization unit 3 in the state and supplied to the high temperature system 1 becomes larger. As a result, the amount of heat source water in the low temperature system 2 increases and the amount of heat source water in the high temperature system 1 decreases, so that the heat source water flows from the low temperature system 2 side to the high temperature system 1 side with respect to the branch path 5. The heat source water of the low temperature system 1 that has circulated is supplied to the heat source heat exchange section 43 of the heat source section 4 through the branch path 5. Therefore, when the heat source water detection unit 6 detects that the heat source water is flowing from the low temperature system 2 side to the high temperature system 1 side, the control unit 7 switches the heat sources 41 and 42 to the warm heat supply state, and the heat source unit. 4 is heated.

  Similarly to the cooling operation, the control unit 7 prioritizes the unused energy heat source 41 over the auxiliary heat source 42 based on the temperature of the heat source water detected by the heat source water detection unit 6 when heating the heat source unit 4. In addition to controlling the operating state of the heat source unit 4, the heat supplied from the heat sources 41 and 42 to the heat source heat exchange unit 43 is circulated based on the flow rate of the heat source water detected by the heat source water detection unit 6. The unused side flow rate adjusting pump 49 and the auxiliary side flow rate adjusting pump 50 are controlled so as to adjust the flow rate of the carrier. FIG. 2 shows a case where the unused energy heat source 41 is used to heat the heat source unit 4.

  Further, when the heat source section 4 is heated, the control section 7 sets the heat source so that the flow direction of the heat carrier from the heat sources 41 and 42 in the heat source heat exchange section 43 is opposite to the cooling direction. The side switching valve 48 is switched. As a result, even when the heat source unit 4 is heated, the heat transfer from the heat sources 41 and 42 to the heat carrier water from the low temperature system 2 side to the high temperature system 1 side in the heat source heat exchange unit 43 is performed. The distribution directions are opposite to each other.

  In FIG. 3, the heat utilization unit 3 in the high temperature utilization state (the two heat utilization units 3 located at the second and lowermost sides from the upper side in the figure) and the heat utilization unit 3 in the low temperature utilization state (uppermost in the diagram) 2 and the two heat utilization parts 3) located third from the upper side are mixed, and the cooling load and the heating load are the same or substantially the same. The operation of the heat utilization unit 3 at this time is the same as that described above.

  In this case, since the cooling load and the heating load are the same or substantially the same, the amount of heat source water that is taken from the low temperature system 2 into the heat utilization unit 3 in the low temperature utilization state and supplied to the high temperature system 1 and the high temperature The amount of heat source water taken from the system 1 to the heat utilization unit 3 in the high temperature utilization state and supplied to the low temperature system 2 becomes the same or substantially the same. As a result, the heat source water amount does not change in both the high temperature system 1 and the low temperature system 2, so that there is no circulation of the heat source water to the branch passage 5. Therefore, when the heat source water detection unit 6 detects a state where there is no circulation of the heat source water, the control unit 7 keeps the heat source unit 4 inoperative. Therefore, since the heat source unit 4 is not operated, energy consumption can be reduced and energy saving can be achieved.

  In this case, as the flow of the heat source water, the heat source water is taken in from the high temperature system 1 to the heat utilization unit 3 in the high temperature utilization state, the heat source water after use is supplied to the low temperature system 2, and the heat source water after use is The flow is only taken from the low temperature system 2 to the heat utilizing unit 3 in the low temperature utilization state. That is, the heat source water is circulated in the order of the high temperature system 1, the heat utilizing unit 3 in the high temperature utilization state, the low temperature system 2, the heat utilization unit 3 in the low temperature utilization state, and the high temperature system 1 without being supplied to the heat source unit 4. ..

  For example, in the summer, the air conditioning request is only the cooling request. FIG. 4 shows a case where there is no heat utilization unit 3 in the high temperature utilization state, and only the heat utilization unit 3 in the low temperature utilization state exists. The operation of the heat utilization unit 3 in the low temperature utilization state at this time is similar to the above-described operation.

  In this case, similar to FIG. 1, which shows a case where the heat utilization unit 3 in the low temperature utilization state and the heat utilization unit 3 in the high temperature utilization state coexist and the cooling load is larger than the heating load, with respect to the branch path 5. The heat source water flows from the high temperature system 1 side toward the low temperature system 2 side, and the heat source water of the high temperature system 1 is supplied to the heat source heat exchange section 43 through the branch path 5. Therefore, when the heat source water detection unit 6 detects that the heat source water flows from the high temperature system 1 side to the low temperature system 2 side, the control unit 7 switches the heat sources 41 and 42 to the cold heat supply state, and the heat source unit. 4. Turn on cooling. The cooling operation of the heat source unit 4 is the same as the operation in FIG.

  For example, in winter, the air conditioning request may be only a heating request. FIG. 5 shows a case where the heat utilization unit 3 in the low temperature utilization state does not exist and only the heat utilization unit 3 in the high temperature utilization state exists. The operation of the heat utilization unit 3 in the high temperature utilization state at this time is similar to the above-described operation.

  In this case, similar to FIG. 2, which shows a case where the heat utilization unit 3 in the low temperature utilization state and the heat utilization unit 3 in the high temperature utilization state are mixed and the heating load is larger than the cooling load, the branch passage 5 is The heat source water flows from the low temperature system 2 side toward the high temperature system 1 side, and the heat source water of the low temperature system 2 is supplied to the heat source heat exchange section 43 through the branch path 5. Therefore, when the heat source water detection unit 6 detects that the heat source water is flowing from the low temperature system 2 side to the high temperature system 1 side, the control unit 7 switches the heat sources 41 and 42 to the warm heat supply state, and the heat source unit. 4 is heated. The heating operation of the heat source unit 4 is the same as the operation in FIG.

  As shown in FIGS. 1 to 5, when the heating load or the cooling load is large in the plurality of heat utilization units 3 as a whole, heat source water is circulated in the branch path 5 to generate the heating load and the cooling load. When the load is the same or substantially the same, there is no circulation of the heat source water in the branch passage 5. Further, depending on which of the heating load and the cooling load is larger, whether the heat source water flows in the distribution direction from the high temperature system 1 side to the low temperature system 2 side in the branch path 5, or from the low temperature system 2 side to the high temperature system 1 side. Whether or not the heat source water flows in the flow direction toward the direction changes. Therefore, by providing the branch path 5 and the heat source water detection unit 6, it is possible to appropriately detect the presence or absence of circulation of the heat source water in the heat source heat exchange unit 43, and the circulation direction thereof. The control unit 7 controls the operating state of the heat source unit 4 on the basis of the detection information of the heat source water detection unit 6 so that the heat source unit 4 is not wastefully operated and energy is saved while the heat source unit 4 is being operated. The operating state of can be controlled appropriately.

  Since the high temperature system 1 and the low temperature system 2 are separated with the heat source heat exchange section 43 in the heat source unit 4 interposed therebetween, the heat source water of the high temperature system 1 and the heat source water of the low temperature system 2 are mixed to change the temperature. Mixing loss can be suppressed, and energy can be saved.

  Here, when the heat source unit 4 is cooled, the control unit 7 can control the operating state of the heat source unit 4 so that the heat source water reaches the low temperature set temperature. Further, when the heat source unit 4 is heated, the control unit 7 can control the operating state of the heat source unit 4 so that the heat source water reaches the high temperature set temperature. Thus, by cooling the heat source water to the low temperature set temperature by the cooling operation of the heat source unit 4, the temperature of the heat source water of the low temperature system 2 can be adjusted to the low temperature set temperature, and the heating operation of the heat source unit 4 is performed. By heating the heat source water to the high temperature set temperature, the temperature of the heat source water of the high temperature system 1 can be adjusted to the high temperature set temperature. Therefore, heat source water having a set temperature for high temperature can be supplied to the heat utilization unit 3 in the high temperature utilization state, the heat utilization in the heat utilization unit 3 in the high temperature utilization state can be stably performed, and the heat utilization water in the low temperature utilization state can be performed. The heat source water of the set temperature for low temperature can be supplied to the utilization unit 3, and the heat utilization in the heat utilization unit 3 in the low temperature utilization state can be stably performed.

  Then, it is possible to appropriately change what temperature the high temperature set temperature and the low temperature set temperature are set, and the high temperature set temperature is set when the heat is utilized by the heat utilization unit 3 in the high temperature utilization state. The temperature can be set to a temperature that can improve the efficiency, and the set temperature for low temperature can be set to a temperature that can improve the efficiency when hot heat is used in the heat use unit 3 in the low temperature use state.

  As shown in FIG. 1, when the heating load and the cooling load are mixed and the cooling load is larger than the heating load, heat source water of the preset temperature for cooling is supplied to a large number of heat utilization units 3 in the low temperature utilization state. Can be supplied. Therefore, the efficiency is improved in many heat utilization units 3 in the low temperature utilization state, and the efficiency of the system as a whole can be improved. Further, as shown in FIG. 4, when all the heat utilization units 3 are in the low temperature utilization state, the efficiency is improved in all the heat utilization units 3, so that the efficiency of the entire system can be improved. ..

  As shown in FIG. 2, when the heating load and the cooling load are mixed and the heating load is larger than the cooling load, heat source water of the heating set temperature is supplied to a large number of heat utilization units 3 in the high temperature utilization state. Can be supplied. Therefore, the efficiency is improved in a large number of heat utilization units 3 in the high temperature utilization state, so that the efficiency of the entire system can be improved. Further, as shown in FIG. 5, when all the heat utilization units 3 are in the high temperature utilization state, the efficiency is improved in all the heat utilization units 3, so that the efficiency of the entire system can be improved. ..

  The high temperature set temperature and the low temperature set temperature do not always need to be set to constant temperatures. For example, in the middle period, the high temperature set temperature is set to the first temperature, and the low temperature set temperature is set to the second temperature. In the winter season, the high temperature set temperature is set to a temperature higher than the first temperature, and the summer season is set. In addition, the set temperature for low temperature can be set to a temperature lower than the second temperature. In this way, it is also possible to change and set according to the season, the heat utilization status of the plurality of heat utilization units 3 as a whole, and the like.

  Further, for example, the high temperature set temperature when using the unused energy heat source 41 may be set to the first temperature, and the high temperature set temperature when using the auxiliary heat source 42 may be set to a temperature higher than the first temperature. it can. In this way, the set temperature for high temperature when using the unused energy heat source 41 and the set temperature for high temperature when using the auxiliary heat source 42 can be set to different temperatures. The low temperature set temperature when using the unused energy heat source 41 and the low temperature set temperature when using the auxiliary heat source 42 do not necessarily have to be set to the same temperature as the high temperature set temperature. It is also possible to set different temperatures, such as setting the temperature to be lower when using the auxiliary heat source 42 than when using the unused energy heat source 41.

[Another embodiment]
(1) In the above-described embodiment, when the heat source unit 4 is cooled and heated, the state in which the unused energy heat source 41 is used and the state in which the auxiliary heat source 42 is used are constantly switched. Depending on the season and the heat utilization status of the plurality of heat utilization units 3, the state of using the unused energy heat source 41 and the state of using the auxiliary heat source 42 may be used, for example, in the state of using only the auxiliary heat source 42 in winter. The case can be divided into the case of switching to and the case of using only the auxiliary heat source 42.

(2) In the above embodiment, the number of heat utilization units 3 is not limited to four, and can be changed as appropriate.

(3) In the above embodiment, an example in which the heat source heat exchange unit 43 is provided is shown. However, for example, the unused energy heat source 41 or the auxiliary heat source 42 is used as the heat source water without the heat source heat exchange unit 43. Can also be heated or cooled directly.

(4) In the above embodiment, by providing a calorimeter as the heat source water detection unit 6 in the detection flow path 6a provided in the branch path 5, the flow state of the heat source water in the branch path 5, the temperature of the heat source water, The flow rate of heat source water is detected. Instead of this, for example, a heat source water temperature detection unit that detects the temperature of the heat source water is provided on both sides of the one side and the other side of the branch path 5, and at least one of the one side and the other side of the branch path 5 is provided. A heat source water flow state/heat source water flow rate detection unit that detects the presence or absence of the flow of the heat source water and the flow state of the heat source water and the flow rate of the heat source water may be provided. Therefore, it is also possible to directly detect the flow state of the heat source water, the temperature of the heat source water, and the flow rate of the heat source water in the branch passage 5 without providing the detection flow path 6a.

1 High temperature system 2 Low temperature system 3 Heat utilization part 4 Heat source part 5 Branch path 6 Heat source water detection part (heat source water flow state detection part, heat source water temperature detection part, heat source water flow rate detection part)
7 Control unit 34 Flow rate adjusting pump (flow rate adjusting unit)
41 Unused Energy Heat Source 42 Auxiliary Heat Source 43 Heat Source Heat Exchange Section 49 Unused Side Flow Rate Adjustment Pump (Heat Carrier Flow Rate Adjustment Section)
50 Auxiliary flow rate adjustment pump (heat carrier flow rate adjustment unit)

Claims (5)

A heat utilization system including a plurality of heat utilization units,
A high-temperature system capable of supplying high-temperature heat source water to each of the plurality of heat utilization units,
A low temperature system capable of supplying low temperature heat source water to each of the plurality of heat utilization units,
A cooling operation of cooling the heat source water supplied from the high temperature system side and supplying it to the low temperature system side, and a heating operation of heating the heat source water supplied from the low temperature system side and supplying it to the high temperature system side. And a feasible heat source,
Each of the plurality of heat utilization units, utilizing the heat source water of the high temperature system, a high temperature utilization state of supplying the heat source water after utilization to the low temperature system, and utilizing the heat source water of the low temperature system, utilization It is configured to be able to switch to a low-temperature utilization state in which the heat source water after that is supplied to the high-temperature system,
Heat source water is arranged on the heat source side from which the high temperature system side or the low temperature system side is supplied to the heat source unit, and a part of the heat source water is branched and supplied to the low temperature system side or the high temperature system side. Fork road,
A heat source water flow state detection unit for detecting the flow state of the heat source water in the branch passage,
Based on the detection information of the heat source water flow state detection unit, a control unit for controlling the operating state of the heat source unit is provided ,
One end side of the branch path is connected to the high temperature system, and the other end side of the branch path is connected to the low temperature system,
A detection flow path is provided, one end of which is connected to one side of the branch path connected to the high temperature system, and the other end of which is connected to the other side of the branch path connected to the low temperature system. ,
The heat source water flow state detection unit is provided in the detection flow path,
The heat utilization system in which the heat source water circulation state detection unit detects the temperature of the heat source water, the flow rate of the heat source water, and the circulation direction of the heat source water as the circulation state of the heat source water . The heat utilization system according to claim 1, wherein the detection flow passage is provided with one heat source water circulation state detection unit .   As a heat source in the heat source unit, an unused energy heat source that uses unused energy and an auxiliary heat source are provided, and a heat source water temperature detection unit that detects the temperature of the heat source water in the branch path is provided, and the control unit is the The heat utilization according to claim 1 or 2 which controls the operating state of said heat source part in the form which uses said unused energy heat source with priority over said auxiliary heat source based on the detection information of a heat source water temperature detection part. system.   The heat utilization system according to any one of claims 1 to 3, wherein the heat source unit includes a heat source heat exchange unit that exchanges heat between the heat carrier and the heat source water that are circulated and supplied from the heat source.   Based on the heat source water flow rate detection unit that detects the flow rate of the heat source water in the branch passage, and the detection information of the heat source water flow rate detection unit, the flow rate of the heat carrier that is circulated and supplied from the heat source to the heat source heat exchange unit. The heat utilization system according to claim 4, further comprising: a heat carrier flow rate adjusting unit for adjusting.

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