JP2014016066A - Heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating system capable of properly changing a flow rate of a heat medium passing through a heat exchanger according to a situation.SOLUTION: A hot water supply heating system 2 includes a heat pump 50, a tank 10, a tank water circulation path 20, a three-fluid heat exchanger 58, an air-heating water circulation path 71, and six heaters 76a-76f. The air-heating water circulation path 71 includes a bypass path 94 and an adjusting valve 90. The bypass path 94 connects an upstream side and a downstream side of the three-fluid heat exchanger 58. The adjusting valve 90 changes a ratio of a flow rate of water passing through the three-fluid heat exchanger 58 and a flow rate of water passing through the bypass path 94 by changing its opening. The more the number of operated heaters 76 is, the more the flow rate of the water circulated in the air-heating water circulation path 71 increases, by operation of a circulation pump 74. The adjusting valve 90 changes its opening so that the more the number of operated heaters 76 is, the more the ratio of the flow rate of the water passing through the bypass path 94 increases.

Description

  The technology disclosed in the present specification relates to a heating system.

  Patent Document 1 discloses a heat pump that circulates the first heat medium, a second heat medium circulation path that circulates the second heat medium, and a circulation pump that sends the second heat medium in the second heat medium circulation path to the downstream side. A heat exchanger that heats the second heat medium by heat exchange with the first heat medium, a heating device that heats the second heat medium with a larger heating amount per unit time than the heat pump, and the second heat medium A heating system including a heater that heats using heat is disclosed. In the system of Patent Document 1, a bypass path that bypasses the heat exchanger is provided in the second heat medium circulation path, and an on-off valve that opens and closes the bypass path is provided.

JP 2009-299941 A

  In the technique of Patent Document 1, the on-off valve can only switch between two states, a state where the bypass passage is opened and a state where the bypass passage is closed. Therefore, there is a need for a technique that can appropriately change the flow rate of the heat medium passing through the bypass path according to the situation. This specification provides the heating system which can change the flow volume of the heat carrier which passes a bypass way appropriately according to a situation.

  The heating system disclosed in the present specification includes a heat pump, a second heat medium circulation path, a circulation pump, a heat exchanger, a plurality of heaters, a bypass path, and a regulating valve. The heat pump includes a first heat medium circulation path for circulating the first heat medium. The second heat medium circulation path circulates the second heat medium. The circulation pump sends out the second heat medium in the second heat medium circuit to the downstream side. The heat exchanger heats the second heat medium by exchanging heat with the first heat medium. The plurality of heaters are heated using the heat of the second heat medium. The bypass path is provided in the second heat medium circulation path and connects the upstream side and the downstream side of the heat exchanger. The regulating valve is provided in the bypass passage, and changes the ratio of the flow rate of the second heat medium passing through the heat exchanger and the flow rate of the second heat medium passing through the bypass passage by changing the opening degree. The flow rate of the second heat medium that circulates in the second heat medium circulation path increases as the number of heaters that operate among the plurality of heaters increases due to the operation of the circulation pump. The regulating valve changes the opening degree so that the proportion of the flow rate of the second heat medium passing through the bypass passage increases as the number of heaters that are operated increases among the plurality of heaters.

  The plurality of heaters are preferably arranged in parallel with each other.

  In the above heating system, the ratio of the flow rate of the second heat medium that passes through the heat exchanger and the flow rate of the second heat medium that passes through the bypass path can be changed by changing the opening of the regulating valve. Therefore, in this heating system, it is possible to appropriately change the flow rate of the second heat medium passing through the bypass path according to the situation.

  For comparison, in the same manner as described above, in a heating system including a plurality of heaters, a conventional configuration in which an on-off valve that merely opens and closes the bypass path is provided in the bypass path. In the conventional configuration, when heating operation is performed using a heat pump as a heat source, it is necessary to close the bypass. On the other hand, when the number of operating heaters increases, in order to supply the second heat medium to each heater, it is necessary to increase the flow rate of the second heat medium circulating in the second heat medium circulation path. In this case, in the conventional configuration, when the heating operation is performed using the heat pump as a heat source, the entire amount of the second heat medium circulating in the second heat medium circulation path is introduced into the heat exchanger. However, the pipe resistance of the heat exchanger is usually larger than the pipe resistance of the second heat medium circuit. Therefore, even if it is attempted to increase the flow rate of the second heat medium circulating in the second heat medium circuit, the head of the circulation pump is insufficient, and the entire amount of the second heat medium circulating in the second heat medium circuit is heat exchanged. There may be situations where it cannot pass through the vessel. As a result, the flow rate required by each heater may not be obtained for the entire second heat medium circuit.

  In this respect, in the above heating system, the adjustment valve is opened so that the proportion of the flow rate of the second heat medium passing through the bypass passage increases as the number of heaters that are operated among the plurality of heaters increases. Change the degree. Therefore, when the flow rate of the second heat medium that circulates through the second heat medium circulation path increases as the number of heaters that operate increases due to the operation of the circulation pump, the second heat medium that passes through the bypass path. By increasing the ratio of the flow rate, it is possible to suppress a shortage of the head of the circulation pump and appropriately circulate the entire amount of the second heat medium circulating in the second heat medium circulation path. Therefore, a required amount of the second heat medium can be supplied to each heater. That is, according to the heating system described above, the flow rate of the second heat medium passing through the bypass path can be appropriately changed even in a situation where the number of operating heaters increases. Therefore, as described above, according to the above heating system, it is possible to appropriately change the flow rate of the second heat medium passing through the bypass path according to the situation.

The figure which shows typically operation | movement of the hot water supply heating system of 1st Example at the time of a thermal storage driving | operation and a hot water supply driving | operation. The table | surface which shows the various setting values for every number of the heaters which operate | move. The flowchart which shows the process which a hot-water supply heating system performs at the time of heating operation. The flowchart which shows temperature control. The figure which shows typically operation | movement of the hot-water supply heating system at the time of heating operation. The figure which shows typically operation | movement of the hot-water supply heating system at the time of heating operation.

  The main features of the embodiments described below are listed. The technical elements described below are independent technical elements and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Characteristic 1) The adjustment valve may further change the opening degree so that the value of the head of the circulation pump is equal to or higher than a predetermined reference value. Here, the predetermined reference value means that if the pump head value is lower than this reference value, it may be difficult to circulate the second heat medium at a required flow rate in the second heat medium circuit. Is a high value. According to this structure, even if it is a case where the number of the heaters which act | operate increases, the 2nd heat carrier of a required flow volume can be circulated in a 2nd heat carrier circuit.

(Characteristic 2) The heat pump may be capable of changing a heating amount per unit time. The heat pump may change the heating amount per unit time so that the heating amount per unit time increases as the flow rate of the second heat medium passing through the bypass passage increases. According to this structure, according to the number of the heaters which operate | move, a 2nd heat medium can be heated appropriately with a heat pump.

(Characteristic 3) The heating amount per unit time is larger than that of the heat pump, and a heating device for heating the second heat medium may be further provided. According to this configuration, when the second heat medium cannot be sufficiently heated by the heat pump, the second heat medium can be heated by the heating device.

(Example)
As shown in FIG. 1, the hot water supply / heating system 2 according to this embodiment includes a hot water supply system 104, a heat pump system 106, a heating system 108, and a control device 100.

  The heat pump system 106 includes a heat pump 50 and a three-fluid heat exchanger 58. The heat pump 50 includes a heat medium circulation path 52 for circulating a heat medium (for example, Freon gas R410A), a heat exchanger (evaporator) 54, a fan 56, a compressor 62, and an expansion valve 60. ing. The heat medium circulation path 52 passes through the three-fluid heat exchanger 58. Further, the heat exchanger 54, the compressor 62, and the expansion valve 60 are installed in the heat medium circuit 52.

  The heat exchanger 54 exchanges heat between the outside air blown by the fan 56 and the heat medium in the heat medium circuit 52. As will be described later, the heat exchanger 54 is supplied with a heat medium in a low-pressure low-temperature liquid state after passing through the expansion valve 60. The heat exchanger 54 heats the heat medium by exchanging heat between the heat medium and the outside air. The heat medium is vaporized by being heated, and becomes a gas state at a relatively high temperature and a low pressure.

  The compressor 62 compresses the heat medium in the heat medium circuit 52 and sends it out to the three-fluid heat exchanger 58 side. The heat medium after passing through the heat exchanger 54 is supplied to the compressor 62. In other words, the compressor 62 is supplied with a gas medium in a gaseous state at a relatively high temperature and low pressure. When the heat medium is compressed by the compressor 62, the heat medium becomes a high-temperature and high-pressure gas state. The compressor 62 sends the compressed high-temperature and high-pressure gaseous heat medium to the three-fluid heat exchanger 58 side. As a result, the heat medium in the heat medium circuit 52 circulates in the order of the heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60.

  The high-temperature and high-pressure gaseous heat medium sent out from the compressor 62 is supplied to the heat medium circuit 52 of the three-fluid heat exchanger 58. The three-fluid heat exchanger 58 can exchange heat between the heat medium in the heat medium circuit 52 and water in the tank water circuit 20 described later. Furthermore, the three-fluid heat exchanger 58 can exchange heat between the heat medium in the heat medium circulation path 52 and water in a heat recovery path 88 described later. That is, the three-fluid heat exchanger 58 functions as a first heat exchanger that heats the water in the tank water circulation path 20 and a second heat exchanger that heats the water in the heat recovery path 88. As a result of heat exchange, the heat medium is deprived of heat and condensed. As a result, the heat medium becomes a high-pressure liquid state at a relatively low temperature.

  The expansion valve 60 is supplied with a liquid medium having a relatively low temperature and high pressure after passing through the three-fluid heat exchanger 58. The heat medium is depressurized by passing through the expansion valve 60, and becomes a low-temperature and low-pressure liquid state. The heat medium that has passed through the expansion valve 60 is supplied to the heat exchanger 54 as described above.

  As will be described in detail later, in the present embodiment, the heat pump 50 has a heating capacity (a heating amount per unit time) according to the opening degree of the regulating valve 90 (that is, according to the number of heaters 76 to be operated). Can be changed. Specifically, the amount of heating (heating ability) per unit time can be changed by changing the compression rate of the heat medium by the compressor 62 and changing the temperature of the heat medium. In this embodiment, when the compressibility of the heat medium is increased, the temperature of the heat medium is increased and the heating amount per unit time is also increased. As a result, the temperature of water after being heated by the three-fluid heat exchanger 58 is also increased. In the present embodiment, the heat pump 50 adjusts the compression rate of the heat medium by the compressor 62 so that the amount of heating per unit time increases as the flow rate of water passing through the bypass 94 increases.

  The hot water supply system 104 includes a tank 10, a tank water circulation path 20, a tap water introduction path 24, a supply path 36, and a burner heating device 81.

  The tank 10 stores hot water heated by the heat pump 50. The tank 10 is a hermetically sealed type, and the outside is covered with a heat insulating material. Water is stored in the tank 10 until it is full. The thermistors 12, 14, 16 and 18 are attached to the tank 10 at substantially equal intervals in the height direction of the tank 10. Each thermistor 12, 14, 16, 18 measures the temperature of water at its mounting position.

  The tank water circulation path 20 has an upstream end connected to the lower part of the tank 10 and a downstream end connected to the upper part of the tank 10. A circulation pump 22 is interposed in the tank water circulation path 20. The circulation pump 22 sends the water in the tank water circulation path 20 from the upstream side to the downstream side. Further, as described above, the tank water circulation path 20 passes through the three-fluid heat exchanger 58. Therefore, when the heat pump 50 is operated, the water in the tank water circulation path 20 is heated by the three-fluid heat exchanger 58. Accordingly, when the circulation pump 22 and the heat pump 50 are operated, the water in the lower part of the tank 10 is sent to the three-fluid heat exchanger 58 and heated, and the heated water is returned to the upper part of the tank 10. The tank water circulation path 20 is a water path for storing heat in the tank 10.

  The upstream end of the tap water introduction path 24 is connected to a tap water supply source 32. The downstream side of the tap water introduction path 24 is branched into a first introduction path 24a and a second introduction path 24b. The downstream end of the first introduction path 24 a is connected to the lower part of the tank 10. The downstream end of the second introduction path 24 b is connected in the middle of the supply path 36. A mixing valve 36a that adjusts the ratio of the flow rate of water flowing through the first introduction path 24a (that is, the supply path 36) and the flow rate of water flowing through the second introduction path 24b is disposed in the connection portion. A check valve 26 is interposed in the first introduction path 24a. A check valve 28 and a water amount sensor 30 are interposed in the second introduction path 24b. The water amount sensor 30 detects the flow rate of tap water flowing in the second introduction path 24b.

  The upstream end of the supply path 36 is connected to the upper part of the tank 10. As described above, the second introduction path 24 b of the tap water introduction path 24 is connected in the middle of the supply path 36. A water amount sensor 34 is interposed in the supply passage 36 upstream from the connection portion with the second introduction passage 24b. The water amount sensor 34 detects the flow rate of water flowing in the supply path 36. A burner heating device 81 is interposed in the supply path 36 on the downstream side of the connection portion with the second introduction path 24b. The burner heating device 81 heats the water in the supply path 36. The downstream end of the supply path 36 is connected to a hot water tap 38. The supply path 36 is provided with a bypass path 36 b that is a flow path that bypasses the burner heating device 81. The bypass passage 36b is provided with a bypass control valve 36c for adjusting the opening degree of the bypass passage 36b.

  The heating system 108 includes a cistern 70, a heating water circulation path 71, a burner heating device 82, and six heaters 76a, 76b, 76c, 76d, 76e, and 76f. Hereinafter, the heaters 76a to 76f may be simply referred to as the heater 76. The heating water circulation path 71 includes a heating forward path 72, a heating return path 84, a regulating valve 90, a heat recovery path 88, a bypass path 94, and a circulation path 96. The heating water circulation path 71 is a water path for circulating the water in the cistern 70. Water in the heating water circulation path 71 is heated by the burner heating device 82 and the three-fluid heat exchanger 58.

  The cistern 70 is a container having an open top and stores water therein. The downstream end of the circulation flow path 96 and the upstream end of the heating forward path 72 are connected to the cistern 70. Water flows from the circulation channel 96 into the cistern 70. Water in the cistern 70 is introduced into the heating forward path 72.

  The heating forward path 72 has an upstream end connected to the cistern 70, and a downstream end branched into six and connected to the outlets of the heaters 76a to 76f. A circulation pump 74 is interposed in the heating forward path 72. The circulation pump 74 is a pump that sends water in the heating forward path 72 downstream. As will be described in detail later, the flow rate of the water circulating in the heating circulation path 71 changes according to the number of heaters 76 that operate. That is, even if the number of rotations of the circulation pump 74 per unit time is constant, if the number of heaters 76 to be operated increases, the resistance of the heating forward path 72 decreases and the water circulating in the heating water circulation path 71 is reduced. The flow rate increases. Therefore, in the present embodiment, the flow rate of the water circulating in the heating water circulation path 71 increases as the number of the heaters 76 to be operated increases. A burner heating device 82 is interposed in the heating forward path 72 upstream of the heaters 76a to 76f. The burner heating device 82 heats the water in the heating forward path 72. The operation of the burner heating device 82 is illustrated in FIG. The burner heating device 82 has a higher ability to heat water circulating in the heating water circulation path 71 than the heat pump 50. In other words, the burner heating device 82 has a larger heating amount per unit time than the heat pump 50. The water heated by the burner heating device 82 is supplied to each of the heaters 76a to 76f. Further, a thermistor 78 is interposed on the downstream side of the burner heating device 82 in the heating forward path 72. The thermistor 78 measures the temperature of the water in the heating forward path 72 after passing through the burner heating device 82.

  Each of the heaters 76 a to 76 f is a terminal that heats the living room using the heat of water supplied from the heating forward path 72. All the heaters 76a to 76f are arranged in parallel to each other. Water is supplied from the heating forward path 72 to each of the operating heaters 76a to 76f. On the other hand, water is not supplied from the heating forward path 72 to the heaters 76a to 76f that are stopped (not operating). When the water supplied from the heating forward path 72 is used for heating, it is deprived of heat and becomes relatively low temperature water. The relatively low-temperature water after being used for heating is introduced into the heating return path 84.

  The heating return path 84 has six upstream ends that are branched into six and connected to the return ports of the heaters 76 a to 76 f, and the downstream ends are connected to the upstream end of the bypass path 94 and the upstream end of the heat recovery path 88. A thermistor 86 is interposed in the heating return path 84. The thermistor 86 measures the temperature of water in the heating return path 84.

  The heat recovery path 88 has an upstream end connected to the upstream end of the bypass path 94 and the downstream end of the heating return path 84, and a downstream end connected to the downstream end of the bypass path 94 and the upstream end of the circulation flow path 96. The heat recovery path 88 passes through the three-fluid heat exchanger 58. Therefore, when the heat pump 50 is operated, the water in the heat recovery path 88 is heated by the three-fluid heat exchanger 58. A thermistor 92 is interposed on the downstream side of the three-fluid heat exchanger 58 in the heat recovery path 88. The thermistor 92 measures the temperature of the water in the heat recovery path 88 after passing through the three-fluid heat exchanger 58.

  The bypass path 94 has an upstream end connected to the downstream end of the heating return path 84 and the upstream end of the heat recovery path 88, and a downstream end connected to the downstream end of the heat recovery path 88 and the upstream end of the circulation path 96. That is, the bypass path 94 bypasses the upstream side and the downstream side of the three-fluid heat exchanger 58.

  The regulating valve 90 is attached to a connection portion between the downstream end of the heating return path 84, the upstream end of the heat recovery path 88, and the upstream end of the bypass path 94. The regulating valve 90 changes the opening degree, thereby allowing the flow rate of water passing through the heat recovery path 88 (flow rate of water passing through the three-fluid heat exchanger 58) and the flow rate of water passing through the bypass path 94. The ratio of can be changed. For example, a three-way valve is used as the regulating valve 90 of this embodiment. As will be described in detail later, the adjustment valve 90 can change the opening according to the number of heaters 76 to be operated. In the present embodiment, the adjustment valve 90 changes the opening degree so that the proportion of the flow rate of the second heat medium passing through the bypass 94 increases as the number of heaters 76 to be operated increases.

  The circulation channel 96 has an upstream end connected to the downstream end of the heat recovery path 88 and the downstream end of the bypass path 94, and a downstream end connected to the cistern 70. A thermistor 98 is interposed in the circulation channel 96. The thermistor 98 measures the temperature of water in the circulation channel 96.

  The control device 100 is electrically connected to the hot water supply system 104, the heat pump system 106, and the heating system 108, and controls the operation of each component.

(Setting according to the number of heaters 76 that operate)
As described above, in the present embodiment, the flow rate of water in the heating water circulation path 71 changes according to the number of heaters 76 that operate. Moreover, the adjustment valve 90 changes an opening according to the number of the heaters 76 which operate | move.

  FIG. 2 is a table showing the set values of the pump flow rate, the regulating valve step, the lift, the three-fluid heat AC amount, and the ratio of the heat AC amount for each number of heaters 76 to be operated.

  The pump flow rate in FIG. 2 is a numerical value indicating the flow rate (L / min) of water flowing in the heating water circulation path 71. In this embodiment, the number of rotations of the circulation pump 74 does not change, but each time one heater 76 that operates is decreased, the pipe resistance decreases. As a result, the flow rate of water flowing in the heating water circulation path 71 is 2L. Increases by / min.

  The adjusting valve step in FIG. 2 is a numerical value indicating the opening degree of the adjusting valve 90. The larger the value, the larger the proportion of the flow rate that passes through the bypass 94. For example, the regulating valve step “400” is the regulating valve 90 when the total amount of water circulating in the heating water circulation path 71 passes through the heat recovery path 88 (three-fluid heat exchanger 58) and does not pass through the bypass path 94 at all. Is the degree of opening. Regulating valve steps “880”, “1080”, and “1840” all pass through the heat recovery path 88 (three-fluid heat exchanger 58) through which part of the water circulating in the heating water circulation path 71 passes through the other This is the opening degree of the regulating valve 90 when a part passes through the bypass 94. The regulating valve step “2700” is a regulating valve 90 when the entire amount of water circulating in the heating water circulation path 71 passes through the bypass path 94 and does not pass through the heat recovery path 88 (three-fluid heat exchanger 58) at all. Is the degree of opening.

  The lift in FIG. 2 is a numerical value indicating the lift (kPa) of the circulation pump 74. The head of the circulation pump 74 usually decreases as the flow rate of water flowing through the heating water circulation path 71 increases. In the present embodiment, the opening degree of the regulating valve 90 is adjusted so that the value of the head of the circulation pump 74 is equal to or higher than a predetermined reference value (50 kPa) regardless of the number of heaters 76 that are operated. Here, when the value of the head of the circulation pump 74 is lower than the reference value, the predetermined reference value is likely to make it difficult to circulate a necessary flow rate of water in the heating water circulation path 71. Value. In FIG. 2, there is a portion where the head value is represented as “77 (61)”. Among these, the numerical value “77” outside the parentheses indicates the value of the head when the opening degree of the adjusting valve 90 is adjusted to the value of the corresponding adjusting valve step (880), and the numerical value “(61)” within the parentheses is The value of the head when the opening degree of the adjusting valve 90 is not adjusted to the value of the corresponding adjusting valve step (that is, when the value of the adjusting valve step is maintained at 400) is shown.

  The three-fluid heat AC amount in FIG. 2 is a numerical value indicating the flow rate (L / min) of water flowing through the three-fluid heat exchanger 58.

  The ratio of the amount of heat exchange in FIG. 2 is a numerical value indicating the ratio (%) of the flow rate of water flowing through the three-fluid heat exchanger 58 in the flow rate of water flowing through the heating water circulation path 71.

  For example, when the number of heaters 76 to be operated is one, the flow rate of water flowing in the heating water circulation path 71 becomes 2 L / min by the operation of the circulation pump 74. At this time, the adjustment valve 90 adjusts the opening so that the adjustment valve step is 400. That is, the entire amount of water circulating in the heating water circulation path 71 passes through the heat recovery path 88 (three-fluid heat exchanger 58). In this case, the head of the circulation pump 74 is 100 kPa. Further, as described above, since the total amount of water circulating in the heating water circulation path 71 passes through the heat recovery path 88 (three-fluid heat exchanger 58), the three-fluid heat AC amount is 2 L / min, and the heat AC amount Is also 100%.

  For example, when the number of heaters 76 to be operated is four, the flow rate of water flowing in the heating water circulation path 71 is 8 L / min by the operation of the circulation pump 74. At this time, the adjustment valve 90 adjusts the opening so that the adjustment valve step is 1080. That is, a part of the water circulating in the heating water circulation path 71 passes through the heat recovery path 88 (three-fluid heat exchanger 58), and the other part passes through the bypass path 94. In this case, the head of the circulation pump 74 is 70 kPa. In this case, the three-fluid heat AC amount is 3.5 L / min, and the ratio of the heat AC amount is 44%.

(Operation of hot water heating system)
Next, the operation of the hot water supply / heating system 2 of the present embodiment will be described. The hot water supply and heating system 2 can execute a heat storage operation, a hot water supply operation, and a heating operation. Hereinafter, each operation will be described.

(Heat storage operation)
The heat storage operation is an operation in which water in the tank 10 is heated by heat generated by the heat pump 50. 1 indicate the flow of the heat medium of the heat pump 50 and the flow of water in the tank 10 during the heat storage operation. When execution of the heat storage operation is instructed by the control device 100, the heat pump 50 operates and the circulation pump 22 rotates. At this time, in the heat pump 50, the compressor 62 operates.

  When the heat pump 50 operates, the heat medium in the heat medium circuit 52 circulates in the order of the heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60. In this case, the heat medium in the heat medium circuit 52 passing through the three-fluid heat exchanger 58 is in a high-temperature and high-pressure gas state. Further, when the circulation pump 22 rotates, the water in the tank 10 circulates in the tank water circulation path 20. That is, the water existing in the lower part of the tank 10 is introduced into the tank water circulation path 20 and is heated by the heat of the heat medium in the heat medium circulation path 52 when the introduced water passes through the three-fluid heat exchanger 58. The heated water is returned to the upper part of the tank 10. Thereby, hot water is stored in the tank 10. A high temperature water layer is formed in the upper part of the tank 10, and a low temperature water layer is formed in the lower part.

(Hot water operation)
The hot water supply operation is an operation for supplying water in the tank 10 to the hot water tap 38. The broken line arrows in FIG. 1 indicate the flow of water in the tank 10 during the hot water supply operation. The hot water supply operation can also be executed during the above heat storage operation. When the hot water tap 38 is opened, the control device 100 opens the mixing valve 36a. Then, tap water flows into the lower part of the tank 10 from the tap water introduction path 24 (first introduction path 24 a) due to the water pressure from the tap water supply source 32. At the same time, the hot water in the upper part of the tank 10 is supplied to the hot water tap 38 via the supply path 36.

  When the temperature of the water supplied from the tank 10 to the supply path 36 (that is, the detected temperature of the thermistor 12) is higher than the hot water supply set temperature, the control device 100 adjusts the mixing valve 36a to adjust the second introduction path. Tap water is introduced into the supply path 36 from 24b. Accordingly, the water supplied from the tank 10 and the tap water supplied from the second introduction path 24 b are mixed in the supply path 36. The control apparatus 100 adjusts the opening ratio of the mixing valve 36a so that the temperature of the water supplied to the hot-water tap 38 matches the hot-water supply set temperature. On the other hand, the control device 100 operates the burner heating device 81 when the temperature of the water supplied from the tank 10 to the supply path 36 is lower than the hot water supply set temperature. Accordingly, the water passing through the supply path 36 is heated by the burner heating device 81. The heated water is mixed with the water from the bypass passage 36 b whose opening degree is adjusted by the bypass control valve 36 c and supplied to the hot water tap 38. The control device 100 controls the output of the burner heating device 81 so that the temperature of the water supplied to the hot-water tap 38 matches the hot-water supply set temperature.

(Heating operation)
The heating operation is an operation in which the room 76 is heated by operating the heater 76. 3 and 4 are flowcharts showing processing executed by the control device 100 during the heating operation. FIG. 5 shows the operation of each component during heating operation when only one heater 76a is operating. The solid line arrows in FIG. 5 indicate the flow of the heat medium of the heat pump 50 and the flow of water in the heating water circulation path 71. Moreover, FIG. 6 shows operation | movement of each component in heating operation in case the four heaters 76a-76d are act | operating.

  When the execution of the heating operation is instructed by the user, in S10, the control device 100 first adjusts the opening degree of the adjustment valve 90 according to the number of heaters 76 that are operated. Specifically, in S <b> 10, the control device 10 adjusts the opening degree of the adjustment valve 90 to an adjustment valve step (see FIG. 2) that is set in advance according to the number of heaters 76 that are operated.

  As a result, there is a path in which the water in the cistern 70 returns from the cistern 70 to the cistern 70 through the heating forward path 72, the heater 76, the heating return path 84, the heat recovery path 88, and the circulation path 96 in this order. Formed (see FIG. 5). Further, depending on the opening degree of the regulating valve 90, a path in which a part of the water flowing through the heat recovery path 88 passes through the bypass path 94 and is introduced into the circulation path 96 is formed (see FIG. 6).

  Next, in S12, the control device 100 operates the circulation pump 74 at a predetermined rotational speed.

  Next, in S14, the control device 100 starts temperature control (see FIG. 4). The contents of the temperature control will be described later in detail. By starting the temperature control, the water circulating in the path is heated by at least one of the burner heating device 82 and the heat pump 50, and the heated water is supplied to the heater 76 that operates. The operating heater 76 heats the living room using the heat of the supplied water.

  If temperature control control is started in S14, it will progress to S16 and the control apparatus 100 will monitor that the number of the heaters 76 which act | operate changes. When the number of the heaters 76 which operate | moves changes, the control apparatus 100 judges YES in S16, and progresses to S18.

  In S18, the control device 100 determines whether or not the number of operating heaters 76 is zero. When the number of the operating heaters 76 is not 0, the control device 100 determines NO in S18 and returns to S10. In S10, the control apparatus 100 readjusts the opening degree of the adjustment valve 90 according to the number of the heaters 76 currently operating.

  On the other hand, when the number of heaters 76 to be operated is 0, the control device 100 determines YES in S18 and proceeds to S20. In S20, the control device 100 stops all the heat pump 50, the burner heating device 82, and the circulation pump 74 that are operating. When S20 ends, the heating operation ends.

  Next, the contents of the temperature control will be described with reference to FIG. The temperature control is a control executed by the control device 100 so that the temperature of water supplied to the heater 76 becomes a predetermined set temperature (for example, 40 ° C.). When the temperature control is started (see S14 of FIG. 3), the control device 100 performs the processing of S30 to 36 (control processing of the burner heating device 82) and the processing of S40 to 46 (control processing of the heat pump 50). Are executed in parallel. Hereinafter, both processes will be described in order.

  In S30, the control device 100 monitors whether the detected temperature T1 of the thermistor 78 is equal to or lower than a predetermined threshold value Tbon. Here, the threshold value Tbon is a threshold value for operating the burner heating device 82 and can be set to 30 ° C., for example. When the detected temperature T1 of the thermistor 78 is equal to or lower than the predetermined threshold value Tbon, the control device 100 determines YES in S30, and proceeds to S32.

  In S <b> 32, the control device 100 operates the burner heating device 82. Thereby, the water passing through the heating forward path 72 is heated by the burner heating device 82. When the burner heating device 82 is operated in S32, the control device 100 proceeds to S34.

  In S34, the control device 100 monitors whether the detected temperature T1 of the thermistor 78 is equal to or higher than a predetermined threshold value Tboff. Here, the threshold value Tboff is a threshold value for stopping the burner heating device 82 and can be set to 45 ° C., for example. The threshold value Tboff is higher than the predetermined set temperature (for example, 40 ° C.). If the detected temperature T1 of the thermistor 78 is equal to or higher than the predetermined threshold value Tboff, the control device 100 determines YES in S34, and proceeds to S36.

  In S36, the control device 100 stops the burner heating device 82. Thereby, the water passing through the heating forward path 72 is not heated by the burner heating device 82. In this case, it means that the temperature of water in the heating forward path 72 on the downstream side of the burner heating device 82 (that is, water supplied to the heater 76) is higher than a predetermined set temperature. Therefore, it is not necessary to heat the water passing through the heating forward path 72 by the burner heating device 82 any more. Therefore, in this embodiment, the burner heating device 82 is stopped when the detected temperature T1 of the thermistor 78 is equal to or higher than a predetermined threshold value Tboff. When the burner heating device 82 is stopped in S36, the control device 100 returns to S30.

  On the other hand, in S40, the control device 100 monitors whether the detected temperature T2 of the thermistor 92 is equal to or lower than a predetermined threshold value Thon. Here, the threshold Thon is a threshold for operating the heat pump 50 and can be set to 37 ° C., for example. The threshold Thon is set to a temperature higher than the above threshold Tbon (for example, 30 ° C.). If the detected temperature T2 of the thermistor 92 is equal to or lower than the predetermined threshold value Thon, the control device 100 determines YES in S40, and proceeds to S42.

  In S42, the control device 100 operates the heat pump 50. Thereby, the water passing through the heat recovery path 88 is heated by the heat of the heat medium in the heat medium circulation path 52 in the three-fluid heat exchanger 58. At this time, the control device 100 changes the compression rate of the heat medium by the compressor 62 according to the opening degree of the regulating valve 90 (that is, according to the number of the operating heaters 76), and changes the unit per unit time. Change the heating amount (heating capacity). In the present embodiment, the control device 100 adjusts the compression rate of the heat medium by the compressor 62 so that the heating rate per unit time increases as the flow rate of the water passing through the bypass 94 increases. When the heat pump 50 is operated in S42, the control device 100 proceeds to S44.

  In S44, the control device 100 monitors whether the detected temperature T2 of the thermistor 86 is equal to or higher than a predetermined threshold value Toff. Here, the threshold value Tboff is a threshold value for stopping the heat pump 50, and can be set to 40 ° C., for example. The threshold value Thoff is set at a lower temperature than the threshold value Tboff (for example, 45 ° C.). When the detected temperature T2 of the thermistor 86 is equal to or higher than the predetermined threshold value Thoff, the control device 100 determines YES in S44, and proceeds to S46.

  In S46, the control device 100 stops the heat pump 50. Thereby, the water passing through the heat recovery path 88 is not heated by the heat of the heat medium in the heat medium circulation path 52 in the three-fluid heat exchanger 58. When the temperature of the water in the heating return path 84 rises, the temperature of the heat medium in the heat medium circulation path 52 that passes through the three-fluid heat exchanger 58 and the water in the heat recovery path 88 that passes through the three-fluid heat exchanger 58. The temperature difference between the two becomes smaller, and the heating efficiency by the heat pump 50 decreases. Therefore, in the present embodiment, the heat pump 50 is stopped when the detected temperature T2 of the thermistor 86 is equal to or higher than a predetermined threshold value Thoff. When the heat pump 50 is stopped in S46, the control device 100 returns to S40.

  As described above, when the temperature control is started, the control device 100 repeatedly executes the processes of S30 to S36 and the processes of S40 to S46. However, as described above, when the number of operating heaters 76 is 0 (YES in S18 of FIG. 3), the control device 100 operates the heat pump 50, the burner heating device 82, and the circulation pump 74 that are operating. Stop all. In this case, the temperature control in FIG. 4 is also terminated.

(Specific example of heating operation)
A specific example of heating operation will be described. For example, when the user operates one heater 76a among the six heaters 76a to 76f to start the heating operation, first, the control device 100 adjusts the opening degree of the adjustment valve 90. The valve step is set to “400” (see FIG. 2) so that the total amount of water circulating in the heating water circulation path 71 passes through the heat recovery path 88 (three-fluid heat exchanger 58) and does not pass through the bypass path 94 at all. (S10 in FIG. 3). As a result, as shown in FIG. 5, the water in the cistern 70 passes from the cistern 70 through the heating forward path 72, the heater 76, the heating return path 84, the heat recovery path 88, and the circulation path 96 in this order. Thus, a path returning to the systole 70 is formed. Next, the control device 100 operates the circulation pump 74 (S12 in FIG. 3). Thereby, the flow volume of the water which flows through the water circulation path 71 for heating becomes 2 L / min.

  Next, the control device 100 starts temperature control (see FIG. 4). Immediately after the start of the heating operation, the temperature of the water in each part in the heating water circulation path 71 is relatively low. In this example, at this time, the detection temperature T1 of the thermistor 78 is lower than a threshold value Tbon (for example, 30 ° C.), and the detection temperature T2 of the thermistor 92 is lower than the threshold value Thon (for example, 37 ° C.) (YES in S30 of FIG. 4). And YES in S40). Therefore, in this example, the control apparatus 100 operates both the heat pump 50 and the burner heating apparatus 82 (S32 and S42 in FIG. 4). As a result, as shown in FIG. 5, the water circulating in the above path is heated by the burner heating device 82 when passing through the heating forward path 72, and also when three-fluid heat exchange is performed when passing through the heat recovery path 88. In the vessel 58, the heat is heated by the heat of the heat medium in the heat medium circuit 52. As a result, water that has been heated using both the burner heating device 82 and the heat pump 50 is supplied to one heater 76a that is operating. The heater 76a uses the heat of the supplied water to heat the living room.

  If the above operation is continued, the temperature of the water in each part in the heating water circulation path 71 rises. When the detected temperature T1 of the thermistor 78 becomes equal to or higher than a predetermined threshold value Tboff (for example, 45 ° C.) (YES in S34 in FIG. 4), the control device 100 first stops the burner heating device 82 (S36 in FIG. 4).

  Even if the burner heating device 82 is stopped, the heat pump 50 continues to operate, so the temperature of the water in each part in the heating water circulation path 71 further increases. When the detected temperature T2 of the thermistor 92 becomes equal to or higher than a predetermined threshold value Thoff (for example, 40 ° C.) (YES in S44 of FIG. 4), the control device 100 also stops the heat pump 50 (S46 of FIG. 4). In this case, the heater 76a heats the room using the remaining heat of the water circulating in the heating water circulation path 71.

  If the heater 76a continues to operate in this state, the temperature of the water circulating in the heating water circulation path 71 gradually decreases. When the detected temperature T2 of the thermistor 92 falls below a predetermined threshold Thon (for example, 37 ° C.) again (YES in S40 of FIG. 4), the control device 100 operates the heat pump 50 again. Thereby, the water passing through the heat recovery path 88 is heated.

  Thereby, the temperature of the water of each part in the water circulation path 71 for heating rises again. When the detected temperature T2 of the thermistor 92 becomes equal to or higher than a predetermined threshold value Thoff (for example, 40 ° C.) again (YES in S44 of FIG. 4), the control device 100 stops the heat pump 50 again (S46 of FIG. 4). Thus, stable heating operation can be continued while repeating the operation and stop of the heat pump 50. In this case, since the heat pump 50 is operated in preference to the burner heating device 82, an energy efficient heating operation is realized.

  From this state, an example where the number of operating heaters is further increased from one (the heater 76a) to four (the heaters 76a to 76d) will be further described. In this case, as shown in FIG. 6, the control device 100 sets the opening degree of the regulating valve 90 to the regulating valve step “1080” (see FIG. 2), and a part of the water circulating through the heating water circulation path 71. Passes through the heat recovery path 88 (three-fluid heat exchanger 58), and the other part passes through the bypass path 94 (YES in S16, NO in S18, and S10 in FIG. 3). Next, the control device 100 operates the circulation pump 74 (S12 in FIG. 3). Thereby, the flow volume of the water which flows through the water circulation path 71 for heating becomes 8 L / min (refer FIG. 2).

  As the number of operating heaters increases from one (the heater 76a) to four (the heaters 76a to 76d), the heat radiation amount in the heaters 76a to 76d also increases. As a result, the temperature of the water in each part in the heating water circulation path 71 may be lowered again. In this example, at this time, the detected temperature T1 of the thermistor 78 is lower than a threshold value Tbon (for example, 30 ° C.), and the detected temperature T2 of the thermistor 92 is lower than a threshold value Thon (for example, 37 ° C.) (in S30 of FIG. 4). YES and YES in S40). Therefore, the control device 100 operates both the heat pump 50 and the burner heating device 82 again (S32 and S42 in FIG. 4). As described above, the amount of heating (heating capacity) per unit time of the heat pump 50 is adjusted according to the opening degree of the adjusting valve 90 (that is, according to the number of heaters 76 that operate). In this example, the control device 100 is accompanied by an increase in the rate of water flow through the bypass 94 (that is, an increase in the number of operating heaters 76 and an increase in the amount of heat release). ), The compression rate of the heat medium by the compressor 62 is adjusted so that the heating amount per unit time is increased. As a result, as shown in FIG. 5, the water circulating in the above path is heated by the burner heating device 82 when passing through the heating forward path 72, and also when three-fluid heat exchange is performed when passing through the heat recovery path 88. In the vessel 58, the heat is heated by the heat of the heat medium in the heat medium circuit 52. The temperature of the water heated by the three-fluid heat exchanger 58 is higher than when only the heater 76a is operated. As a result, water that has been heated using both the burner heating device 82 and the heat pump 50 is supplied to one heater 76a that is operating. The heaters 76a to 76d heat the living room using the heat of the supplied water.

  Each subsequent process is the same as the case where only one said heater 76a operate | moves. Moreover, the same process is performed also when the number of the heaters 76 which act | operate increases / decreases. However, when the number of heaters 76 to be operated becomes zero (YES in S18 of FIG. 3), the control device 100 stops all the heat pump 50, the burner heating device 82, and the circulation pump 74 that are operating (FIG. 3). 3 S20). In this case, the heating operation ends.

  In the above, the structure and operation | movement of the hot-water supply heating system 2 of a present Example were demonstrated. As described above, in the hot water supply and heating system 2 according to the present embodiment, the flow rate of the water passing through the three-fluid heat exchanger 58 and the flow rate of the water passing through the bypass 94 are changed by changing the opening degree of the regulating valve 90. The ratio can be changed. Therefore, in this hot water supply and heating system 2, the flow rate of water in the heating water circulation path 71 passing through the three-fluid heat exchanger 58 is appropriately changed according to the situation by adjusting the opening of the adjustment valve 90. It is possible.

  Moreover, in the hot water supply and heating system 2 of the present embodiment, the opening degree of the regulating valve 90 is changed so that the ratio of the flow rate of the water passing through the bypass 94 increases as the number of operating heaters 76 increases ( (See FIG. 2). Therefore, when the flow rate of water circulating through the heating water circulation path 71 increases with the increase in the number of heaters 76 that operate due to the operation of the circulation pump 74, the ratio of the flow rate of water passing through the bypass path 94 It is possible to suppress a shortage of the head of the circulation pump 74 and to appropriately circulate the entire amount of water circulating in the heating water circulation path 71. Therefore, a required amount of water can be supplied to each heater 76 that operates. That is, according to the hot water supply and heating system 2 of the present embodiment, the flow rate of water passing through the bypass 94 can be appropriately changed in a situation where the number of operating heaters 76 increases.

  Further, in this embodiment, the opening degree of the regulating valve 90 is adjusted so that the head value of the circulation pump 74 is equal to or higher than a predetermined reference value (50 kPa) regardless of the number of heaters 76 that are operated. . Therefore, even when the number of heaters 76 to be operated increases, the required flow rate of water can be circulated in the heating water circulation path 71.

  In the present embodiment, the heat pump 50 can change the heating amount per unit time (that is, the heating capacity). The heat pump 50 has a higher rate of water passing through the bypass 94 (that is, the greater the number of heaters 76 that operate), the greater the amount of heating per unit time. The amount of heating may be changed. According to this configuration, water can be appropriately heated by the heat pump 50 in accordance with the number of heaters 76 that operate.

  In addition to the heat pump 50, the hot water supply and heating system 2 of the present embodiment includes a burner heating device 82 as a heat source. Therefore, when the water cannot be sufficiently heated by the heat pump 50, the water can be heated to the target temperature by using the burner heating device 82 as an auxiliary heat source.

  The hot water supply / heating system 2 of the present embodiment is an example of a “heating system”. The heat medium circuit 52 and the heating water circuit 71 are examples of the “first heat medium circuit” and the “second heat medium circuit”, respectively. The three-fluid heat exchanger 58 is an example of a “heat exchanger”.

  As mentioned above, although the Example of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

(Modification 1) The hot water supply and heating system 2 may include a high-temperature heater separately from the heaters 76a to 76f. Furthermore, in addition to the heating operation using the heaters 76a to 76f (hereinafter referred to as “low temperature heating operation” in this modification), the hot water supply / heating system 2 performs the high temperature heating operation using the high temperature heater described above. May be. In the high-temperature heating operation, the control device 100 adjusts the opening degree of the adjustment valve 90 so that the adjustment valve step “2700” is obtained. That is, the controller 100 opens the adjustment valve 90 so that the entire amount of water circulating in the heating water circulation path 71 passes through the bypass path 94 and does not pass through the heat recovery path 88 (three-fluid heat exchanger 58) at all. Adjust. That is, in the high-temperature heating operation, only the burner heating device 82 is used as a heat source without operating the heat pump 50. In the high temperature heating operation, the preset temperature of water supplied to the high temperature heater is higher than the preset temperature in the low temperature heating operation.

(Modification 2) The control apparatus 100 monitors the detected temperature of each thermistor 78, 86, 92, 98 during heating operation, and the temperature of each part of water calculated from the opening degree of the regulating valve 90, and each thermistor It may be monitored whether there is a difference of a predetermined threshold value or more between the actual detected temperatures of 78, 86, 92, and 98. When there is a difference of a predetermined threshold value or more between the water temperature of each part calculated from the opening degree of the regulating valve 90 and the actual detected temperature of each thermistor 78, 86, 92, 98, the control device 100 It may be determined that an error has occurred and the heating operation may be stopped.

(Modification 3) The control device 100 may check the operation of the regulating valve 90 while the heating operation is not being executed. Specifically, the control device 100 performs an operation of fully opening the adjustment valve 90 on the three-fluid heat exchanger 58 side (hereinafter referred to as “fully open” in the present modification), and fully opening (hereinafter referred to as the bypass path 94 side). In this modification, the operation is called “fully closed”). Normally, when the regulating valve 90 is fully opened, the control device 100 detects a signal (so-called “limiter”) indicating that. Similarly, even when the regulating valve 90 is fully closed, the control device 100 detects a signal indicating that (a so-called “limiter”). As a result of the operation check, if the control device 100 does not detect the limiter, the control device 100 can determine that the setting of the fully open / closed state of the regulating valve 90 is not normal, and can notify that effect.

2: Hot water supply / heating system 10: Tanks 12, 14, 16, 18: Thermistor 20: Tank water circulation path 22: Circulation pump 24: Tap water introduction path 24a: First introduction path 24b: Second introduction path 26: Check valve 28 : Check valve 30: Water quantity sensor 32: Tap water supply source 34: Water quantity sensor 36: Supply path 36 a: Mixing valve 36 b: Bypass path 36 c: Bypass control valve 38: Hot water tap 50: Heat pump 52: Heat medium circulation path 54: Heat exchanger 56: Fan 58: Three-fluid heat exchanger 60: Expansion valve 62: Compressor 70: Systurn 71: Heating water circulation path 72: Heating forward path 74: Circulation pumps 76a, 76b, 76c, 76d, 76e, 76f: Heater 78: Thermistor 81: Burner heating device 82: Burner heating device 84: Heating return path 86: Thermistor 88: Heat recovery path 90: Regulating valve 92: Thermistor 94 Heating bypass passage 96: circulating passage 98: Thermistor 100: controller 104: hot water line 106: Heat Pump line 108: Heating system

Claims (4)

A heating system,
A heat pump comprising a first heat medium circulation path for circulating the first heat medium;
A second heat medium circulation path for circulating the second heat medium;
A circulation pump for sending the second heat medium in the second heat medium circulation path downstream;
A heat exchanger for heating the second heat medium by heat exchange with the first heat medium;
A plurality of heaters for heating using heat of the second heat medium;
A bypass path provided in the second heat medium circulation path to connect the upstream side and the downstream side of the heat exchanger;
An adjustment valve that is provided in the bypass path and changes a ratio of a flow rate of the second heat medium passing through the heat exchanger and a flow rate of the second heat medium passing through the bypass path by changing the opening degree;
With
By the operation of the circulation pump, the flow rate of the second heat medium circulating in the second heat medium circulation path increases as the number of heaters to be operated among a plurality of heaters increases.
The regulating valve changes the opening degree so that the ratio of the flow rate of the second heat medium passing through the bypass passage increases as the number of heaters to be operated increases among the plurality of heaters.
A heating system characterized by that. The regulating valve further changes the opening so that the value of the head of the circulation pump is equal to or higher than a predetermined reference value.
The heating system according to claim 1. The heat pump can change the amount of heating per unit time,
The heat pump changes the heating amount per unit time so that the heating amount per unit time increases as the ratio of the flow rate of the second heat medium passing through the bypass passage increases.
The heating system according to claim 1 or 2, characterized in that. The heating amount per unit time is larger than that of the heat pump, and further includes a heating device that heats the second heat medium.
The heating system according to any one of claims 1 to 3, wherein:

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