JP2015083905A - Heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of efficiently supplying a heating medium at an appropriate temperature to a heating terminal.SOLUTION: A heating device comprises: a heat pump which heats a first heating medium; a heat exchanger which exchanges heat between the first heating medium and a second heating medium; a forward heating passage and a backward heating passage which circulate the second heating medium between the heat exchanger and a heating terminal; a combustion device which heats the second heating medium sent to the heating terminal through the forward heating passage; a bypass route which sends the second heating medium from the backward heating passage to the forward heating passage by bypassing the heat exchanger; a first temperature sensor which measures a temperature of the second heating medium flowing through the forward heating passage at an upstream side of a connection point between the forward heating passage to the bypass route; and a controller. The controller: determines a corrected target temperature by adding a target temperature requested through the heating terminal to a temperature change in the second heating medium flowing through the forward heating passage due to confluence thereof from the bypass route; and controls a heating quantity of the second heating medium with the heat exchanger so that the temperature measured by the first temperature sensor becomes equal to the corrected target temperature.

Description

  The technology disclosed here relates to a heating apparatus, and more particularly, to a heating apparatus that supplies a heated heat medium to a heating terminal.

  Patent Document 1 discloses a heating device. The heating device includes a heat pump that heats the first heat medium, a heat exchanger that exchanges heat between the first heat medium and the second heat medium, and sends the second heat medium from the heat exchanger to the heating terminal. A heating outbound path, a combustion device that heats the second heating medium sent to the heating terminal through the heating outbound path, a heating return path that sends the second heating medium from the heating terminal to the heat exchanger, and upstream of the heating return path and the combustion apparatus A heating path on the upstream side of the connecting position between the heating outbound path and the bypass path, and a bypass path for sending the second heat medium by bypassing the heat exchanger from the heating outbound path to the heating outbound path. A first temperature sensor for measuring the temperature of the second heat medium flowing in the forward path, and a second temperature sensor for measuring the temperature of the second heat medium flowing in the heating forward path on the downstream side of the combustion device are provided. According to such a configuration, the heating amount of the second heat medium in the heat exchanger can be adjusted so that the temperature measured by the first temperature sensor becomes the target temperature required by the heating terminal. For example, when the supply heat from the heat pump is insufficient and the temperature of the second heat medium does not reach the target temperature, the second heat medium can be heated to the target temperature by operating the combustion device.

JP 2012-93064 A

  In the heating device described above, the temperature sensor that measures the temperature of the second heat medium flowing in the heating forward path is disposed upstream of the connection position of the bypass path. With such a configuration, since the temperature change of the second heat medium flowing out from the heat exchanger is detected quickly, the heating amount in the heat exchanger can be adjusted without delay with respect to the temperature change, The temperature of the second heat medium can be quickly stabilized at the target temperature. On the other hand, even if the heating amount of the second heat medium in the heat exchanger is adjusted so that the measured temperature of the second heat medium by the temperature sensor becomes the target temperature required by the heating terminal, the heating forward path from the bypass path The temperature of the heat medium sent to the heating terminal may be lower than the target temperature due to the low-temperature heat medium that joins to the heating terminal. In this case, the second heat medium can be heated to the target temperature by operating the combustion device, but the combustion device is operated even though there is a margin in the amount of heating of the second heat medium in the heat exchanger. As a result, there arises a problem that energy efficiency is lowered.

  The present specification provides a technique that can solve or reduce the above-described problems and supply a heating medium having an appropriate temperature to a heating terminal without lowering energy efficiency.

  The technology disclosed in the present specification is embodied in a heating device. The heating device includes a heat pump that heats the first heat medium, a heat exchanger that exchanges heat between the first heat medium and the second heat medium, and sends the second heat medium from the heat exchanger to the heating terminal. A heating outbound path, a combustion device that heats the second heating medium sent to the heating terminal through the heating outbound path, a heating return path that sends the second heating medium from the heating terminal to the heat exchanger, and upstream of the heating return path and the combustion apparatus The heating heating path is connected to each other, the bypass path that bypasses the heat exchanger from the heating return path to the heating outbound path and sends the second heat medium, and heating is performed upstream of the connection position of the heating outbound path and the bypass path. A first temperature sensor that measures the temperature of the second heat medium flowing in the forward path, a second temperature sensor that measures the temperature of the second heat medium flowing in the heating forward path on the downstream side of the combustion device, and a first temperature sensor Heating amount of the second heat medium in the heat exchanger based on the measured temperature With adjusting comprises a controller for operating the combustion device on the basis of the temperature measured by the first temperature sensor or the second temperature sensor.

  The controller described above determines the corrected target temperature by taking into account the temperature change that occurs in the second heating medium in the heating forward path due to merging from the bypass path to the target temperature required by the heating terminal. Then, the controller adjusts the heating amount of the second heat medium in the heat exchanger so that the measured temperature of the second heat medium by the first temperature sensor becomes the corrected target temperature.

  According to such a configuration, even when a low-temperature heat medium from the bypass path merges with the heat medium sent from the heat exchanger to the heating terminal, the temperature change of the second heat medium due to the merge from the bypass path is offset. As described above, the heating amount of the second heat medium in the heat exchanger is adjusted. Therefore, even if the 1st temperature sensor which measures the temperature of the 2nd heating medium which flows through the heating going way is arranged in the upper stream side rather than the connection position of a bypass path, the temperature of the 2nd heating medium sent to a heating terminal is The heating amount of the second heat medium in the heat exchanger can be appropriately adjusted so that the target temperature required by the heating terminal is obtained. Unless the heating amount of the second heat medium in the heat exchanger is insufficient, the operation of the combustion apparatus can be avoided, so that a heat medium having an appropriate temperature can be supplied to the heating terminal without reducing energy efficiency. .

  In one embodiment of the present technology, the controller includes a target temperature required by the heating terminal, a flow rate of the second heat medium flowing through the heat exchanger, a flow rate of the second heat medium flowing through the bypass route, and a first flow rate flowing through the bypass route. It is preferable to determine the correction target temperature using the temperature of the two heating media. By using these indices, the temperature of the second heat medium sent to the heating terminal (more precisely, the temperature of the second heat medium flowing in the heating forward path after joining the bypass path) is the target temperature required by the heating terminal. Thus, the corrected target temperature can be determined.

In the embodiment described above, the target temperature required by the heating terminal is Tset, the flow rate of the second heat medium flowing through the heat exchanger is Whe, the flow rate of the second heat medium flowing through the bypass path is Wbp, and the second heat flowing through the bypass path is When the temperature of the medium is Tbp and the correction target temperature is TsetB, the following relationship is preferably established.
TsetB = (Tset × (Whe + Wbp) −Tbp × Wbp) / Whe
When such a relationship is established, theoretically, the temperature of the second heat medium sent to the heating terminal becomes equal to the target temperature required by the heating terminal.

In the above relational expression, the temperature change of the second heat medium due to heat radiation in the heating outbound path may be further considered. In this case, assuming that a constant corresponding to the temperature change is A, the corrected target temperature TsetB may be determined so that the following relationship is established.
TsetB = (Tset × (Whe + Wbp) −Tbp × Wbp) / Whe + A
That is, in this relational expression, when a temperature change of the second heat medium due to heat radiation or the like is considered, a constant value is set to A, and when the temperature change is not considered, A may be set to zero.

The figure which shows the structure of the heating apparatus of Example 1. FIG. The flowchart which shows the process which the controller of the heating apparatus of Example 1 performs. The figure explaining the temperature change of the heat medium for heating resulting from the confluence | merging from a bypass path | route. The figure which shows the relationship between the opening degree of a bypass adjustment valve, and the flow rate ratio of a heat exchanger and a bypass path. The figure which shows the structure of the heating apparatus of Example 2. FIG. The flowchart which shows the process which the controller of the heating apparatus of Example 2 performs.

  In one embodiment of the present technology, the heating device preferably further includes a bypass adjustment valve that adjusts the flow rate of the bypass path. In this case, it is preferable that the controller controls the bypass adjustment valve so that the flow rate of the second heat medium flowing through the heat exchanger becomes a predetermined value or less. According to such a configuration, for example, even when a large number of heating terminals are operated simultaneously and the flow rate of the second heat medium increases, the flow rate of the second heat medium flowing through the heat exchanger is limited, The pressure loss of the second heat medium in the exchanger is suppressed, and the flow rate of the second heat medium required by each heating terminal can be maintained. In addition, since the burden on the pump for circulating the second heat medium can be reduced, it is possible to avoid operating the pump in a high rotation range where energy efficiency is likely to deteriorate or adopting a large pump. it can.

  In the above-described embodiment, it is preferable that the heating device further includes a flow rate sensor that measures the flow rate of the second heat medium flowing in the heating forward path, the heating return path, or the bypass path. In this case, the controller specifies the flow rate of the second heat medium flowing through the heat exchanger and the flow rate of the second heat medium flowing through the bypass path based on the flow rate measured by the flow sensor and the opening of the bypass adjustment valve. It is preferable. The ratio of the flow rate of the second heat medium flowing through the heat exchanger and the flow rate of the second heat medium flowing through the bypass path varies depending on the opening of the bypass adjustment valve. Therefore, if the flow rate of the second heat medium flowing through the heating forward path, the heating return path, or the bypass path and the opening degree of the bypass adjustment valve are known, the flow rate of the second heat medium flowing through the heat exchanger and the second flow path flowing through the bypass path are known. The flow rate of the two heating media can be specified respectively.

  In one embodiment of the present technology, it is preferable that the heating device further includes a tank that stores the first heat medium heated by the heat source, and a circulation path that circulates the first heat medium between the tank and the heat exchanger. . As another embodiment, the heating device may circulate the first heat medium directly between the heat source and the heat exchanger without including a tank for storing the first heat medium.

  In one embodiment of the present technology, the heat source is preferably energy efficient, and preferably includes, for example, a heat pump or a generator.

  In one embodiment of the present technology, the heating terminal is disposed at a heating location and dissipates the heat medium, and for example, a floor heating panel, a panel heater, a convector heater, a bathroom heater, a fan heater, and the like are preferable. .

  In one embodiment of the present technology, the heating device may be a hot water supply / heating device capable of performing a hot water supply operation in addition to the heating operation. In this case, the hot water supply and heating device may have a function of performing hot water supply to the bathtub (so-called hot water filling) and heating of the hot water in the bathtub (so-called reheating).

  With reference to drawings, the heating apparatus 10 of Example 1 is demonstrated. The heating device 10 is a heat supply system capable of performing a hot water supply operation for supplying hot water in addition to a heating operation for supplying heat to the heating terminal 60, and is also referred to as a hot water supply and heating device. As shown in FIG. 1, the heating device 10 mainly includes a heat pump 20, a tank 30, a heating heat exchanger 38 (hereinafter simply referred to as a heat exchanger 38), a combustion unit 50, and a controller 100. I have. The combustion unit 50 has a combustion device 52. The heating device 10 also includes a heating circulation path 40 that circulates a heating heat medium between the heat exchanger 38 and the heating terminal 60.

  The heating device 10 includes two heat sources, a heat pump 20 and a combustion device 52, and supplies heat generated by these heat sources to one or a plurality of heating terminals 60 using a heating heat medium. The heating terminal 60 performs heating by dissipating heat from the heating medium. The heating terminal 60 is, for example, a floor heating panel, a panel heater, a convector heater, a bathroom heater, or a fan heater. The heating device 10 is not limited to one, and can supply a heating medium heated by the plurality of heating terminals 60. The combustion device 52 is an auxiliary heat source for making up for heat that is insufficient for the heat pump 20 that is a main heat source.

  The heat pump 20 is a main heat source of the heating apparatus 10 and heats water as the first heat medium by collecting heat from the atmosphere. The tank 30 is a sealed container that stores hot water heated by the heat pump 20, and can be said to be a heat storage container that stores heat generated by the heat pump 20. The heat pump 20 and the tank 30 are connected to each other via a heat storage circulation path 22. The heat storage circulation path 22 is a conduit for circulating hot water between the heat pump 20 and the tank 30. A heat storage pump 24 is provided in the heat storage circulation path 22. The hot water in the tank 30 is sent to the heat pump 20, heated, and returned to the tank 30 again. Thereby, the heat generated by the heat pump 20 is stored in the tank 30. The heat pump 20 and the heat storage pump 24 are electrically connected to the controller 100, and their operations are controlled by the controller 100.

  A plurality of tank temperature sensors 32 are provided in the tank 30 along the height direction. Each tank temperature sensor 32 measures the temperature of the hot water in the tank 30 at each height position. The plurality of tank temperature sensors 32 are electrically connected to the controller 100, and their output signals are input to the controller 100. The controller 100 can grasp the amount of heat (warm water amount) stored in the tank 30 based on the output signals of the plurality of tank temperature sensors 32. As the tank temperature sensor 32, a thermistor can be employed as an example.

  Connected to the tank 30 are a water supply channel 34 for supplying tap water to the tank 30 and a hot water supply channel 35 for discharging hot water from the tank 30. The water supply path 34 is connected to the lower part of the tank 30, and the hot water supply path 35 is connected to the upper part of the tank 30. Hot water discharged from the hot water supply passage 35 is supplied to a hot water supply location such as a currant or a bathtub through a pipe line (not shown).

  The heat exchanger 38 performs heat exchange between the hot water that is the first heat medium and the heating heat medium that is the second heat medium. The heat exchanger 38 is connected to the tank 30 via the heat supply circulation path 36. The heat supply circulation path 36 is a pipe for circulating hot water between the tank 30 and the heat exchanger 38. A heat supply pump 37 is provided in the heat supply circulation path 36. The heat supply pump 37 sends hot water from the upper part of the tank 30 to the heat exchanger 38 through the heat supply circulation path 36, and returns the hot water radiated by the heat exchanger 38 to the lower part of the tank 30. Thereby, the heat stored in the tank 30, that is, the heat generated by the heat pump 20 is supplied to the heat exchanger 38, and the heating heat medium is heated in the heat exchanger 38. The heat supply pump 37 is electrically connected to the controller 100, and its operation is controlled by the controller 100.

  The heating circulation path 40 includes a heating forward path 40a for sending the heating medium from the heat exchanger 38 to the heating terminal 60, and a heating return path 40b for sending the heating medium from the heating terminal 60 to the heat exchanger 38. ing. A heating pump 54 is provided in the heating forward path 40a. When the heating pump 54 is operated, the heating heat medium heated by the heat exchanger 38 is supplied to the heating terminal 60 through the heating forward path 40a. Then, the heating medium radiated by the heating terminal 60 is returned to the heat exchanger 38 through the heating return path 40b.

  A bypass path 44 is provided in the heating circulation path 40. The bypass path 44 is a pipe that branches from the heating return path 40 b and joins the heating forward path 40 a upstream of the combustion device 52. The bypass path 44 bypasses the heat exchanger 38 and sends the heating heat medium from the heating return path 40b to the heating forward path 40a. A bypass adjustment valve 46 is provided in the bypass path 44. The bypass adjustment valve 46 is an electric flow adjustment valve, and the flow rate of the bypass path 44 can be adjusted by changing the opening degree. When the flow rate of the bypass path 44 changes, the flow rate of the heating heat medium flowing through the heat exchanger 38 also changes so as to be inversely proportional thereto. The bypass adjustment valve 46 is electrically connected to the controller 100, and its operation is controlled by the controller 100.

  A first heat medium temperature sensor 42 and a second heat medium temperature sensor 56 are provided in the heating forward path 40a. The first heat medium temperature sensor 42 and the second heat medium temperature sensor 56 each measure the temperature of the heating heat medium flowing in the heating forward path 40a. However, the first heat medium temperature sensor 42 is provided on the upstream side of the connection position 44a between the heating forward path 40a and the bypass path 44, and the temperature of the heating heat medium flowing out from the heat exchanger 38 is determined by the bypass path. It measures before the heating medium for heating from 44 joins. Therefore, the temperature measured by the first heat medium temperature sensor 42 does not necessarily coincide with the temperature of the heating heat medium sent to the heating terminal 60. On the other hand, the second heat medium temperature sensor 56 is provided on the downstream side of the combustion device 52, and heating that is actually sent to the heating terminal 60 regardless of the flow rate of the bypass path 44 and the presence or absence of operation of the combustion device 52. The temperature of the heating medium can be measured. The first heat medium temperature sensor 42 and the second heat medium temperature sensor 56 are electrically connected to the controller 100, and output signals thereof are input to the controller 100. For each of the heat medium temperature sensors 42 and 56, a thermistor can be employed, although it is an example.

  A heating medium flow sensor 48 is provided in the heating return path 40b. The heat medium flow sensor 48 measures the temperature of the heating medium flowing through the heating return path 40b. The heat medium flow sensor 48 is provided on the downstream side of the connection position 44b between the heating return path 40b and the bypass path 44, and measures the flow rate of the heating heat medium flowing into the heat exchanger 38. The heat medium flow sensor 48 is electrically connected to the controller 100, and an output signal thereof is input to the controller 100.

  A return heat medium temperature sensor 49 is provided in the heating return path 40b. The return heat medium temperature sensor 49 measures the temperature of the heating heat medium flowing in the heating return path 40b. The return heat medium temperature sensor 49 is provided downstream of the connection position 44 b between the heating return path 40 b and the bypass path 44, and measures the temperature of the heating heat medium flowing into the heat exchanger 38. Note that the temperature measured by the return heat medium temperature sensor 49 also coincides with the temperature of the heating heat medium flowing through the bypass path 44. The return heat medium temperature sensor 49 is electrically connected to the controller 100, and its output signal is input to the controller 100. Although the return heat medium temperature sensor 49 is an example, a thermistor can be employed.

  The combustion unit 50 is a second heat source of the heating device 10 and includes a combustion device 52. The combustion unit 50 is provided in the middle of the heating outward path 40a. The combustion device 52 burns a combustible gas (for example, city gas or propane gas) and heats the heating heat medium flowing through the heating forward path 40a. The combustion device 52 includes a burner 52a that burns combustible gas, a sensible heat exchanger 52b, and a latent heat exchanger 52c. The sensible heat exchanger 52b and the latent heat exchanger 52c are connected in series, and the heating medium is first heated by the latent heat exchanger 52c and then heated by the sensible heat exchanger 52b. The combustion unit 50 is electrically connected to the controller 100, and its operation is controlled by the controller 100. The controller 100 operates the combustion unit 50 as necessary, such as when the heat supply from the tank 30 is insufficient.

  The controller 100 adjusts the heating amount of the heating heat medium in the heat exchanger 38 based on the temperature measured by the first heat medium temperature sensor 42. Thereby, the temperature of the heating medium sent to the heating terminal 60 is adjusted to the target temperature required by the heating terminal 60. The target temperature required by the heating terminal 60 is the temperature of the heating medium required for the heating terminal 60 to operate correctly, and is determined according to the heating terminal 60. As an example, in this embodiment, it is 60 degrees Celsius. Here, when the heat stored in the tank 30 by the heat pump 20 is insufficient, the temperature measured by the first heat medium temperature sensor 42 is lower than the target temperature even if the heating amount in the heat exchanger 38 is controlled. In this case, the controller 100 starts the operation of the combustion device 52 based on the temperature measured by the first heat medium temperature sensor 42. Note that the controller 100 may start the operation of the combustion device 52 based on the temperature measured by the second heat medium temperature sensor 56. After the operation of the combustion device 52 is started, the controller 100 controls the output of the combustion device 52 so that the temperature measured by the second heat medium temperature sensor 56 becomes the target temperature.

  Here, the temperature measurement of the heating heat medium by the first heat medium temperature sensor 42 is performed on the upstream side of the connection position 44 a between the heating forward path 40 a and the bypass path 44. According to such a configuration, since the temperature change of the heating medium flowing out from the heat exchanger 38 is detected quickly, the heating amount in the heat exchanger 38 can be adjusted without delay with respect to the temperature change. The temperature of the heating medium can be quickly stabilized at the target temperature. On the other hand, even if the temperature measured by the first heat medium temperature sensor 42 is the target temperature required by the heating terminal 60, the temperature is actually sent to the heating terminal 60 by the low-temperature heating medium that joins from the bypass path 44. The temperature of the heating medium to be heated may be lower than the target temperature. At this time, as in the conventional heating device described above, if the heating medium is heated by operating the combustion device 52, the heat amount stored in the tank 30 by the heat pump 20 has a margin. The combustion apparatus 52 will be operated and the problem that the energy efficiency of the heating apparatus 10 falls will arise.

  In response to the above-described problem, the heating device 10 according to the present embodiment determines the corrected target temperature by correcting the target temperature required by the heating terminal 60 when the heating medium flows through the bypass path 44. The bypass adjustment valve 46 is controlled so that the temperature measured by the first heat medium temperature sensor 42 becomes the determined correction target temperature, and the heating amount of the heating heat medium in the heat exchanger 38 (that is, from the tank 30). The heat supply amount). Regarding this operation, the flow of processing executed by the controller 100 will be described with reference to FIG.

  As shown in FIG. 2, when there is a heating operation instruction from the user (YES in S10), the controller 100 starts operation of the heating pump 54 and the heat supply pump 37 (S12). Thereby, hot water circulates between the tank 30 and the heat exchanger 38, and a heating heat medium circulates between the heat exchanger 38 and the heating terminal 60, thereby supplying heat from the tank 30 to the heating terminal 60. Is started.

  Next, the controller 100 obtains the flow rate measured by the heat medium flow rate sensor 48. Then, it is determined whether or not the flow rate measured by the heat medium flow sensor 48, that is, the flow rate of the heating heat medium flowing into the heat exchanger 38 is 9 liters or less per minute (S14). This is because, for example, when a large number of heating terminals 60 are operated at the same time and the flow rate of the heating medium increases, if the flow rate of the heating medium flowing into the heat exchanger 38 is 9 liters or more per minute, heat exchange is performed. This is because the pressure loss in the heater 38 becomes excessive, and the flow rate of the heating medium supplied to each heating terminal 60 may be insufficient. In addition, the value of 9 liters per minute is an example, and may be appropriately changed according to the specific configuration of the heating device 10.

  When the flow rate measured by the heat medium flow rate sensor 48 is less than 9 liters per minute (NO in S14), the controller 100 sets the opening of the bypass adjustment valve 46 to zero. That is, the bypass adjustment valve 46 is closed (S16). In this case, since the heating medium does not flow in the bypass path 44, the temperature of the heating medium sent to the heating terminal 60 matches the temperature measured by the first heat medium temperature sensor 42 (however, the combustion unit 50's Except during driving). Therefore, the controller 100 executes the temperature adjustment control of the heating heat medium using the target temperature required by the heating terminal 60 (hereinafter sometimes referred to as Tset) as it is (S18). That is, the controller 100 adjusts the heating amount of the heating heat medium in the heat exchanger 38 so that the temperature measured by the first heat medium temperature sensor 42 becomes the target temperature Tset. Adjustment of the heating amount of the heating medium in the heat exchanger 38 is performed, for example, by adjusting the output of the heat pump 20 or the rotation speed of the heat supply pump 37.

  Note that, for example, when the heating amount of the heating medium in the heat exchanger 38 is insufficient due to exhaustion of heat in the tank 30, the heating medium cannot be adjusted to the target temperature Tset. In this case, the controller 100 starts the operation of the combustion device 52 based on the temperature measured by the first heat medium temperature sensor 42. Specifically, when the temperature measured by the first heat medium temperature sensor 42 falls below a lower limit temperature that is lower than the target temperature Tset by a predetermined temperature (for example, 5 degrees), the controller 100 starts operation of the combustion device 52. Note that the controller 100 may start the operation of the combustion device 52 based on the temperature measured by the second heat medium temperature sensor 56. After starting the operation of the combustion device 52, the controller 100 controls the output of the combustion device 52 so that the temperature measured by the second heat medium temperature sensor 56 becomes the target temperature Tset.

  On the other hand, when the flow rate measured by the heat medium flow sensor 48 is 9 liters / min or more (YES in S14), the controller 100 increases the opening of the bypass adjustment valve 46 by a predetermined width (S20). In this case, the heating heat medium in the heating return path 40b passes through the bypass path 44 and joins the heating forward path 40a. Therefore, the temperature of the heating heat medium sent to the heating terminal 60 is measured by the heat medium temperature sensor 42. Does not match. Therefore, the controller 100 determines a corrected target temperature by correcting the target temperature Tset without using the target temperature Tset requested by the heating terminal 60 as it is (S22).

  The corrected target temperature flows through the target temperature Tset required by the heating terminal 60, the flow rate Whe of the heating medium flowing through the heat exchanger 38, the flow rate Wbp of the heating medium flowing through the bypass path 44, and the bypass path 44. It is determined using the temperature Tbp of the heating medium. Specifically, when the correction target temperature is set to TsetB, it is determined so that the relational expression of TsetB = (Tset × (Whe + Wbp) −Tbp × Wbp) / Whe is satisfied. As shown in FIG. 3, the flow rate W and temperature T of the heating medium transferred to the heating terminal 60, the flow rate Whe and temperature The of the heating medium that has passed through the heat exchanger 38, and the heating that flows through the bypass path 44. A relationship of W × T = Whe × The + Wbp × Tbp is established with respect to the amount of heat, and W = Whe + Wbp is established with respect to the flow rate between the flow rate Wbp and the temperature Tbp of the heating medium. Therefore, when the temperature The the temperature of the heating medium that has passed through the heat exchanger 38 is adjusted to the correction target temperature TsetB described above, the temperature T of the heating medium that is sent to the heating terminal 60 is requested by the heating terminal 60. Equal to the target temperature Tset.

  In the process of determining the corrected target temperature, the flow rate measured by the heat medium flow sensor 48 is used as the flow rate Whe of the heating heat medium flowing through the heat exchanger 38. For the temperature Tbp of the heating heat medium flowing through the bypass path 44, the temperature measured by the return heat medium temperature sensor 49 is used. However, the flow rate Wbp of the heating heat medium flowing through the bypass path 44 is calculated from the flow rate measured by the heat medium flow rate sensor 48 (that is, the flow rate Whe) and the opening degree of the bypass adjustment valve 46. As shown in FIG. 4, the ratio of the flow rate Wbp to the flow rate Whe changes uniquely according to the opening degree of the bypass adjustment valve 46. Therefore, if the measured flow rate by the heat medium flow sensor 48 and the opening degree of the bypass adjustment valve 46 are known, the flow rates Wbp and Whe of the heating heat medium passing through the bypass path 44 and the heat exchanger 38 are specified. Can do. Here, the heat medium flow rate sensor 48 is not limited to the one that measures the flow rate Whe of the heat exchanger 38, but may measure the flow rate Wbp of the bypass path 44, or measure the sum Whe + Wbp of both. You may do. That is, the heat medium flow rate sensor 48 may be disposed at any position of the heating circulation path 40 or may be disposed at the bypass path 44.

  The controller 100 that has determined the correction target temperature TsetB executes the temperature adjustment control of the heating medium using the correction target temperature TsetB (S24). That is, the controller 100 adjusts the heating amount of the heating heat medium in the heat exchanger 38 so that the temperature measured by the first heat medium temperature sensor 42 becomes the corrected target temperature TsetB. Specifically, the output of the heat pump 20 and the rotation speed of the heat supply pump 37 are adjusted. The heating medium adjusted to the corrected target temperature TsetB merges with the low-temperature heating medium from the bypass path 44. As a result, the temperature of the heating medium actually sent to the heating terminal 60 is the heating terminal. 60 equals the required target temperature Tset. In this case, since it is not necessary to operate the combustion device 52, a heating operation with excellent energy efficiency can be performed.

  Note that, for example, when the heating amount of the heating medium in the heat exchanger 38 is insufficient due to exhaustion of heat in the tank 30, the heating medium cannot be adjusted to the corrected target temperature TsetB. In this case, the controller 100 starts the operation of the combustion device 52 based on the temperature measured by the first heat medium temperature sensor 42. Specifically, the controller 100 starts the operation of the combustion device 52 when the temperature measured by the first heat medium temperature sensor 42 falls below a correction lower limit temperature that is lower than the correction target temperature TsetB by a predetermined temperature (for example, 5 degrees). Note that the controller 100 may start the operation of the combustion device 52 based on the temperature measured by the second heat medium temperature sensor 56. After starting the operation of the combustion device 52, the controller 100 controls the output of the combustion device 52 so that the temperature measured by the second heat medium temperature sensor 56 becomes the target temperature Tset.

  The controller 100 repeatedly executes the processing from S14 to S24 in FIG. 2 described above until the user instructs to stop the heating operation (NO in S26). Thereby, the heating operation is performed while the flow rate of the heating medium flowing through the heat exchanger 38 is maintained at less than 9 liters per minute. If there is an instruction to stop the heating operation from the user (YES in S26), the controller 100 stops the operation of the heating pump 54 and the heat supply pump 37 (S28) and ends the heating operation.

  As described above, in the heating apparatus 10 according to the present embodiment, when the heating heat medium joins from the bypass path 44 to the heating forward path 40a, the corrected target temperature TsetB obtained by correcting the original target temperature Tset is used for heating. The temperature adjustment control of the heating medium is executed. The corrected target temperature TsetB is determined by taking into account the temperature change of the heating medium due to the merge from the bypass path 44 to the original target temperature Tset. Therefore, even if the heat medium temperature sensor 42 is arranged upstream of the connection position 44a of the bypass path 44, the heating terminal 60 requests the temperature of the heating heat medium sent to the heating terminal 60. The temperature can be adjusted to Tset.

  With reference to drawings, the heating apparatus 210 of Example 2 is demonstrated. As shown in FIG. 5, the heating device 210 of the present embodiment does not have the bypass adjustment valve 46 as compared with the heating device 10 of the first embodiment. Therefore, in the heating device 210, a part of the heating heat medium circulating in the heating circulation path 40 always passes through the bypass path 44. Here, the ratio between the flow rate of the heating medium passing through the heat exchanger 38 and the flow rate of the heating medium passing through the bypass path 44 is substantially constant, and is an example, but the ratio in the present embodiment. Is 2: 1. About another structure, since it is common in the heating apparatuses 10 and 210 of Example 1, 2, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  Next, the process which the controller 100 performs in the heating apparatus 210 of Example 2 is demonstrated. As shown in FIG. 6, when there is an instruction for heating operation from the user (YES in S40), the controller 100 starts operation of the heating pump 54 and the heat supply pump 37 (S42). Thereby, heat supply from the tank 30 to the heating terminal 60 is started.

  Next, the controller 100 determines a correction target temperature TsetB (S44). As in the case of the first embodiment, the corrected target temperature TsetB is the target temperature Tset required by the heating terminal 60, the flow rate Whe of the heating heat medium flowing through the heat exchanger 38, and the heating heat medium flowing through the bypass path 44. It is determined using the flow rate Wbp and the temperature Tbp of the heating heat medium flowing through the bypass path 44. That is, it is determined so that the relational expression of TsetB = (Tset × (Whe + Wbp) −Tbp × Wbp) / Whe is satisfied. The flow rate Wbp of the heating medium flowing through the bypass path 44 is twice the flow rate Whe of the heating medium flowing through the heat exchanger 38, that is, twice the flow rate measured by the heat medium flow sensor 48. The heating device 210 is designed so that the flow rate Whe of the heating heat medium flowing through the heat exchanger 38 does not exceed 9 liters per minute even if all the heating terminals 60 are operated simultaneously. This is because if the flow rate Whe exceeds 9 liters per minute, the pressure loss in the heat exchanger 38 becomes excessive, and the flow rate of the heating heat medium supplied to each heating terminal 60 may be insufficient. It is. Note that the value of 9 liters per minute is an example, and may be changed as appropriate according to the specific configuration of the heating device 210.

  The controller 100 that has determined the correction target temperature TsetB executes the temperature adjustment control of the heating medium using the correction target temperature TsetB (S46). That is, the controller 100 adjusts the heating amount of the heating heat medium in the heat exchanger 38 so that the temperature measured by the first heat medium temperature sensor 42 becomes the corrected target temperature TsetB. The heating medium adjusted to the corrected target temperature TsetB merges with the low-temperature heating medium from the bypass path 44. As a result, the temperature of the heating medium actually sent to the heating terminal 60 is the heating terminal. 60 equals the required target temperature Tset. In this case, since it is not necessary to operate the combustion device 52, a heating operation with excellent energy efficiency can be performed. As with the heating device 10 of the first embodiment, when the heating amount of the heating heat medium in the heat exchanger 38 is insufficient, the controller 100 controls the first heat medium temperature sensor 42 (or the second heat medium temperature sensor). The operation of the combustion device 52 is started based on the measured temperature according to 56).

  The controller 100 repeatedly executes the processes of S44 and S46 of FIG. 6 described above until the user instructs to stop the heating operation (NO in S48), and if there is an instruction to stop the heating operation (YES in S48). Then, the operation of the heating pump 54 and the heat supply pump 37 is stopped (S50), and the heating operation is terminated.

  As described above, also in the heating device 210 of the present embodiment, the temperature adjustment control of the heating heat medium is executed using the corrected target temperature TsetB obtained by correcting the original target temperature Tset. The corrected target temperature TsetB is determined by taking into account the temperature change of the heating medium due to the merge from the bypass path 44 to the original target temperature Tset. Therefore, even if the heat medium temperature sensor 42 is arranged upstream of the connection position 44a of the bypass path 44, the heating terminal 60 requests the temperature of the heating heat medium sent to the heating terminal 60. The temperature can be adjusted to Tset.

  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.

  For example, instead of the heat pump 20, the heating apparatuses 10 and 210 may employ a generator or other types of heat sources. Moreover, the heating apparatuses 10 and 210 may directly supply a heat medium such as hot water heated by the heat pump 20 or other heat source to the heat exchanger 38 without having the tank 30.

  Alternatively, in the heating devices 10 and 210, when determining the correction target temperature TsetB, an unavoidable temperature change of the heating medium such as heat radiation in the heating forward path 40a may be taken into consideration. In this case, the correction target temperature TsetB may be determined so that the relationship of TsetB = (Tset × (Whe + Wbp) −Tbp × Wbp) / Whe + A is satisfied with the temperature change as a constant A.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and achieving one of the objects itself has technical utility.

10, 210: Heating device 20: Heat pump 30: Tank 38: Heat exchanger 40: Heating circulation path 40a: Heating forward path 40b: Heating return path 42: First heating medium temperature sensor 44: Bypass path 46: Bypass adjustment valve 48: Heat medium flow sensor 49: Heat medium temperature sensor 54: Heating pump 56: Second heat medium temperature sensor 60: Heating terminal 100: Controller

Claims (6)

A heat pump for heating the first heat medium;
A heat exchanger for exchanging heat between the first heat medium and the second heat medium;
A heating forward path for sending a second heat medium from the heat exchanger to the heating terminal;
A combustion device that heats the second heat medium sent to the heating terminal through the heating outbound path;
A heating return path for sending a second heat medium from the heating terminal to the heat exchanger;
A bypass path that connects the heating return path and a heating outbound path upstream of the combustion device, and bypasses the heat exchanger from the heating return path to the heating outbound path to send a second heat medium;
A first temperature sensor that measures the temperature of the second heat medium flowing through the heating outbound path upstream of the connection position of the heating outbound path and the bypass path;
A second temperature sensor that measures the temperature of the second heat medium flowing through the heating outbound path downstream from the combustion device;
The amount of heating of the second heat medium in the heat exchanger is adjusted based on the temperature measured by the first temperature sensor, and the combustion device is operated based on the temperature measured by the first temperature sensor or the second temperature sensor. And a controller for causing
The controller is
Taking into account the temperature change that occurs in the second heating medium of the heating outbound path by merging from the bypass path to the target temperature required by the heating terminal, determine the corrected target temperature,
Adjusting the heating amount of the second heat medium in the heat exchanger so that the temperature measured by the first temperature sensor becomes the corrected target temperature;
Heating device.   The controller includes a target temperature required by the heating terminal, a flow rate of the second heat medium flowing through the heat exchanger, a flow rate of the second heat medium flowing through the bypass path, and a second heat medium flowing through the bypass path. The heating device according to claim 1, wherein the correction target temperature is determined using the temperature of the air temperature. The target temperature required by the heating terminal is Tset, the flow rate of the second heat medium flowing through the heat exchanger is Whe, the flow rate of the second heat medium flowing through the bypass path is Wbp, and the second heat medium flowing through the bypass path is When the temperature is Tbp, the constant including zero is A, and the correction target temperature is TsetB,
TsetB = (Tset × (Whe + Wbp) −Tbp × Wbp) / Whe + A
The heating apparatus according to claim 2, wherein the relationship is established. Further comprising a bypass adjustment valve for adjusting the flow rate of the bypass path;
The said controller is a heating apparatus as described in any one of Claim 1 to 3 which controls the said bypass adjustment valve so that the flow volume of the 2nd heat medium which flows through the said heat exchanger may be below a predetermined value. A flow rate sensor for measuring a flow rate of the second heat medium flowing through the heating forward path, the heating return path, or the bypass path;
The controller includes a flow rate of the second heat medium flowing through the heat exchanger and a flow rate of the second heat medium flowing through the bypass path based on a measured flow rate by the flow sensor and an opening degree of the bypass adjustment valve. The heating device according to claim 4, wherein each is specified. A tank for storing the first heat medium heated by the heat source;
The heating device according to any one of claims 1 to 5, wherein the heat exchanger performs heat exchange between a first heat medium and a second heat medium in the tank.

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