JP2016109334A - Heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating system capable of operating a heat pump with a proper heating capacity fitted to a radiation amount at a heating terminal even when a tank of a small capacity is used.SOLUTION: A control device 95 decreases a heating capacity of a heat pump unit 20 according to a time required for detecting a temperature of a first threshold value TH1 or more by a thermistor T3 after detection of the first threshold value TH1 or more by a thermistor T2. Similarly, the control device 95 increases the heating capacity of the heat pump unit 20 according to a time required for detecting a temperature lower than a second threshold value TH2 by a thermistor T1 after the thermistor T2 detects a temperature lower than the second threshold value TH2.SELECTED DRAWING: Figure 1

Description

  This specification discloses the technique regarding a heating apparatus.

  In Patent Document 1, a heat pump that heats the heat medium, a tank that stores the heat medium, a detection unit that detects the temperature of the heat medium in the tank, a heating terminal that performs heating using the heat of the heat medium, A heat storage circulation path that circulates a heat medium between a heat pump and a tank, a heat radiation circulation path that circulates the heat medium between a tank and a heating terminal, and a heating apparatus including a control device are disclosed. The controller switches the heating capacity of the heat pump according to the amount of heat stored in the tank when heating is performed at the heating terminal while operating the heat pump.

  In a heating apparatus in which a tank is interposed between a heating terminal and a heat pump, the tank plays a role of buffering fluctuations in the amount of heat released from the heating terminal. For this reason, it is not necessary to immediately follow the heating capacity of the heat pump to change the amount of heat radiation in the heating terminal. In the heating device of Patent Document 1, the heating capacity of the heat pump is switched according to the amount of heat stored in the tank, so that the heat radiation amount in the heating terminal and the heating amount in the heat pump are balanced.

JP 2013-142488 A

  In recent years, a small-capacity tank may be used in order to reduce heat loss from the heat medium stored in the tank and to save space. In the technique of Patent Document 1, when the capacity of the tank is reduced, the amount of heat stored in the tank is likely to fluctuate, and it may be difficult to operate the heat pump with an appropriate heating capacity that matches the heat dissipation amount in the heating terminal.

  In this specification, even if it is a case where a small capacity | capacitance tank is used, the heating apparatus which can operate a heat pump with the suitable heating capability which adapts the thermal radiation amount in a heating terminal is disclosed.

  A heating device disclosed in this specification uses a heat pump that heats a heat medium, a tank that stores the heat medium, a plurality of detection units that detect the temperature of the heat medium in the tank, and heat of the heat medium. A heating terminal for heating, a heat storage circulation path for circulating the heat medium between the heat pump and the tank, a heat radiation circulation path for circulating the heat medium between the tank and the heating terminal, and a control device are provided. The plurality of detection means include a first thermistor for detecting the temperature of the heat medium at a predetermined position in the tank, and a second thermistor for detecting the temperature of the heat medium at a position different from the first detection means. Detecting means. In the case where the control device performs heating at the heating terminal while operating the heat pump, the difference time required until the specific temperature is also detected by the second detection means after the specific temperature is detected by the first detection means. The heating capacity of the heat pump is changed accordingly.

  The heating capacity of the heat pump can be restated as the heating amount per unit time of the heat pump.

  According to this configuration, the heating device can change the heating capacity of the heat pump according to the difference time. In other words, the heating device can change the heating capacity of the heat pump according to the heat storage rate to the tank or the heat dissipation rate from the tank. That is, the heating device refers to the difference time (that is, the heat storage rate to the tank or the heat dissipation rate from the tank) regardless of the capacity of the tank. The amount of divergence (unbalance amount) can be estimated, and before the tank becomes in a state of insufficient heat storage (hot water condition) due to excessive heat dissipation, or before the tank becomes fully stored due to excessive heat storage, The heat pump can be operated with an appropriate heating capacity suitable for the amount of heat. Therefore, according to this heating apparatus, even when a small-capacity tank is used, the heat pump can be operated with an appropriate heating capacity suitable for the heat radiation amount in the heating terminal.

  When the difference time is the first time, the control device changes the heating capacity of the heat pump by the first change amount, and when the difference time is the second time shorter than the first time, the heating capacity of the heat pump is changed to the first time. It is preferable to change the second change amount that is larger than the change amount.

  According to this configuration, in the heating device, when the difference time is short (that is, when the heat storage rate to the tank or the heat dissipation rate from the tank is fast), the heating capacity of the heat pump is greatly changed, and the difference time is long (that is, When the heat storage rate to the tank or the heat release rate from the tank is slow), the heating capacity of the heat pump can be changed small. Depending on the situation, the heat pump can be operated with an appropriate heating capacity.

The figure which shows typically the structure of the hot water supply heating system 10 of 1st Example. The figure which shows the flow of the heat medium when heating is performed while driving the heat pump unit. It is a figure which shows the flow of a heating medium in case the temperature of the heating medium sent from the tank 30 to the heating outbound path 56 is high with respect to the temperature of the heating medium which the heating terminal 90 requires. It is a figure which shows the flow of a heating medium in case the temperature of the heating medium sent from the tank 30 to the heating outbound path 56 is low with respect to the temperature of the heating medium which the heating terminal 90 requires. The flowchart which shows the heating control process which the control apparatus 95 performs in 1st Example. The flowchart which shows the capability fall process which the control apparatus 95 performs in 1st Example. The flowchart which shows the capability raise process which the control apparatus 95 performs in 1st Example. The figure which shows typically the structure of the hot water supply heating system 100 of 2nd Example. The flowchart which shows the heating control process which the control apparatus 95 performs in 2nd Example. The flowchart which shows the capability fall process which the control apparatus 95 performs in 2nd Example. The flowchart which shows the capability increase process which the control apparatus 95 performs in 2nd Example.

(First embodiment)
(System configuration: Fig. 1)
As shown in FIG. 1, the hot water supply and heating system 10 of this embodiment includes a heat pump unit 20, a tank unit 28, a hot water supply and heating unit 80, a heating terminal 90, and a control device 95.

The heat pump unit 20 is a heat pump that absorbs heat from the atmosphere and heats the heat medium sent from the tank unit 28. Although not shown, the heat pump unit 20 includes a compressor, a radiator, an expansion valve, an evaporator, and a refrigerant circulation path that connects them in order. In addition, a fan that blows air to the evaporator, a motor that drives the fan, and the like are also provided. The refrigerant circulation path is filled with a refrigerant (for example, an HFC refrigerant such as R32 or R410, a CO ₂ refrigerant such as R744, or the like). Since the details of the heat pump unit 20 are the same as known ones, the description thereof is omitted here. The heat pump unit 20 can switch the heating capacity (that is, the heating amount per unit time) in stages by changing the rotation speed of the motor built in the compressor in stages. The heat pump unit 20 is provided with a circulation pump 22 that circulates the heat medium between the heat pump unit 20 and the tank unit 28.

  The tank unit 28 includes a tank 30 that stores a heat medium. The heat medium of the present embodiment is an antifreeze liquid. The tank 30 of this embodiment is an example, but has a capacity of 30 liters. The thermistors T1, T2, and T3 are provided in the tank 30 in order from the upper side in the height direction of the tank 30. The thermistor T1 is provided in the upper part of the tank 30 (for example, 10 liters from the top of the tank 30), and the thermistor T2 is provided in the middle of the tank 30 (for example, 15 liters from the top of the tank 30). The thermistor T3 is provided in the lower part of the tank 30 (for example, 20 liters from the top of the tank 30). The thermistors T1, T2, and T3 are connected to the control device 95. The thermistor for detecting the temperature of the heat medium in the tank 30 is not limited to the above three, and may be provided in two, or a second embodiment (see FIG. 8) described later. As such, four or more may be provided.

  The heat medium in the tank 30 forms a temperature stratification in the tank 30. That is, a high-temperature heat medium layer (hereinafter sometimes referred to as “high-temperature layer”) is formed near the top of the tank 30, and a low-temperature heat medium layer (hereinafter “low-temperature layer”) is formed near the bottom of the tank 30. May be called). Between the high temperature layer and the low temperature layer, an intermediate temperature heat medium layer (hereinafter sometimes referred to as “medium temperature layer”) is formed. The height of the boundary between the high temperature layer and the intermediate temperature layer and the height of the boundary between the low temperature layer and the intermediate temperature layer in the tank 30 vary according to the amount of heat stored in the tank 30. The control device 95 can grasp the position of the boundary between the layers forming the temperature stratification based on the detected temperatures of the thermistors T1, T2, and T3.

  The tank 30 is connected to the heat pump unit 20 via a heat storage forward path 34 and a heat storage return path 32. The heat storage forward path 34 is a pipe line that sends a heat medium from the tank 30 to the heat pump unit 20, and is connected to the bottom of the tank 30. The heat storage return path 32 is a pipe line that returns the heat medium from the heat pump unit 20 to the tank 30, and is connected to the top of the tank 30. The heat storage outward path 34 and the heat storage return path 32 constitute a circulation path for circulating the heat medium between the heat pump unit 20 and the tank 30. The circulation pump 22 described above is provided in the circulation path. Although the circulation pump 22 of the present embodiment is built in the heat pump unit 20, the position of the circulation pump 22 is not particularly limited.

  A manual valve 24 and a heat storage outward thermistor 44 are provided in the heat storage outward path 34. Similarly, the heat storage return path 32 is also provided with a manual valve 24 and a heat storage return path thermistor 46. The heat storage forward thermistor 44 can detect the temperature of the heat medium before heating by the heat pump unit 20, and the heat storage return thermistor 46 can detect the temperature of the heat medium after heating by the heat pump unit 20. The heat storage outward thermistor 44 and the heat storage return thermistor 46 are connected to the control device 95.

  The heating terminal 90 performs heating by dissipating heat from the tank 30. The heating terminal 90 is, for example, a panel heater, a panel radiator, floor heating, a fan convector, or a hot water room air conditioner. The heating terminal 90 is connected to the tank 30 via the heating forward path 56 and the heating return path 60. The heating forward path 56 is a pipe line that sends a heat medium from the tank 30 to the heating terminal 90, and is connected to the top of the tank 30. The heating return path 60 is a conduit that returns the heat medium from the heating terminal 90 to the tank 30, and is connected to the bottom of the tank 30. The heating forward path 56 and the heating return path 60 constitute a circulation path for circulating the heat medium between the tank 30 and the heating terminal 90.

  A drain pipe 50 having a manual valve 52 is connected to the heating return path 60. An expansion tank 70 is provided in the heating return path 60. In this embodiment, since the circuit through which the heat medium circulates is a sealed circuit, an expansion tank 70 is prepared to absorb the thermal expansion of the heat medium. The position where the expansion tank 70 is connected is not limited to the heating return path 60, and may be connected to the heating outbound path 56 or another path, for example.

  The heating forward path 56 is connected to the heating terminal 90 via the hot water supply / heating unit 80. The hot water supply / heating unit 80 is a combustion-type heat source machine, and includes two burners 84 and 86 that combust combustible gas. One burner 84 is for hot water supply, and heats clean water flowing through the hot water supply pipe line 82. The other burner 86 is for heating, and heats the heat medium flowing through the heating forward path 56 as necessary. Further, the hot water supply / heating unit 80 is provided with a circulation pump 87 for circulating a heat medium between the heating terminal 90 and the tank unit 28. The position where the circulation pump 87 is provided is not limited to the hot water supply / heating unit 80 and is not particularly limited. According to this configuration, when the temperature of the heating medium sent to the heating terminal 90 through the heating outbound path 56 is too low, the heating medium flowing through the heating outbound path 56 is heated by the burner 86 to be sent to the heating terminal 90. The temperature of the heat medium to be produced can be raised.

  The heating forward path 56 and the heating return path 60 are connected via a bypass path 64. Thereby, a part or all of the heat medium flowing in the heating return path 60 can be sent to the heating outbound path 56 without passing through the tank 30. In addition, a mixing valve 66 is provided at a branch position between the heating return path 60 and the bypass path 64, and the flow rate of the heating medium sent from the heating return path 60 to the heating outbound path 56 via the bypass path 64, and heating The ratio of the flow rate of the heat medium sent from the return path 60 to the heating forward path 56 via the tank 30 can be adjusted. The mixing valve 66 is connected to the control device 95, and its operation is controlled by the control device 95. According to this configuration, when the temperature of the heat medium sent to the heating terminal 90 through the heating forward path 56 is too high, the heat medium after the heat radiation flowing in the heating return path 60 is changed to the heat medium flowing in the heating forward path 56. By joining, the temperature of the heat medium sent to the heating terminal 90 can be lowered.

  The heating forward path 56 is provided with a first heating outbound path thermistor 48 and a second heating outbound path thermistor 58. The first heating forward path thermistor 48 is provided upstream of the junction where the bypass path 64 joins the heating forward path 56, and detects the temperature of the heat medium sent from the tank 30 to the heating forward path 56. The second heating forward path thermistor 58 is provided on the downstream side of the junction where the bypass path 64 joins the heating outbound path 56, and the heating medium sent from the tank 30 to the heating outbound path 56 and the bypass path 64 for heating The temperature after the heat medium sent to the forward path 56 is mixed is detected. A heating return path thermistor 62 is provided in the heating return path 60. The heating return path thermistor 62 detects the temperature of the heat medium flowing through the heating return path 60. The first heating outward thermistor 48, the second heating outward thermistor 58, and the heating backward thermistor 62 are connected to the control device 95.

  The control device 95 is electrically connected to each thermistor T1, T2, T3, 44, 46, 48, 58, 62, and grasps the temperature of the heat medium detected by each thermistor. The control device 95 is also electrically connected to each element of the heat pump unit 20, the mixing valve 66, and the burners 84 and 86, and controls the operation of each element. Therefore, for example, the control device 95 controls the operation of the mixing valve 66 based on the detected temperatures of the first heating forward path thermistor 48, the second heating forward path thermistor 58, and the heating backward path thermistor 62, thereby sending it to the heating terminal 90. The temperature of the heat medium to be obtained can be adjusted to a desired temperature. Moreover, the control apparatus 95 performs the below-mentioned heating control process (FIGS. 5-7), when heating while operating the heat pump unit 20. FIG.

  FIG. 2 shows the flow of the heat medium when heating is performed while operating the heat pump unit 20. As shown in FIG. 2, a high-temperature heat medium is sent to the heating terminal 90 from the upper part of the tank 30 through the heating forward path 56. The high-temperature heat medium sent to the heating terminal 90 radiates heat at the heating terminal 90 and then returns to the lower part of the tank 30 through the heating return path 60. On the other hand, a low-temperature heat medium is sent to the heat pump unit 20 from the lower part of the tank 30 through the heat storage outbound path 34. The low-temperature heat medium sent to the heat pump unit 20 is heated in the heat pump unit 20 and then returned to the upper portion of the tank 30 through the heat storage return path 32.

  FIG. 3 shows the flow of the heating medium when the temperature of the heating medium sent from the tank 30 to the heating forward path 56 is higher than the temperature of the heating medium required by the heating terminal 90. In this case, the control device 95 adjusts the opening degree of the mixing valve 66 to increase the flow rate of the heating medium sent from the heating return path 60 to the heating outbound path 56 via the bypass path 64, thereby heating the heating return path. The flow rate of the heat medium sent from 60 to the heating forward path 56 via the tank 30 is reduced. Thereby, the temperature of the heating medium sent from the heating forward path 56 to the heating terminal 90 can be adjusted to the temperature of the heating medium required by the heating terminal 90. Even when the temperature of the heat medium requested by the heating terminal 90 is lowered, it is possible to quickly cope with a change in the request at the heating terminal 90.

  FIG. 4 shows the flow of the heat medium when the temperature of the heat medium sent from the tank 30 to the heating forward path 56 is lower than the temperature of the heat medium required by the heating terminal 90. In this case, the control device 95 operates the burner 86 and heats the heat medium flowing through the heating forward path 56 by the burner 86. By adjusting the heating amount in the burner 86, the temperature of the heating medium sent from the heating forward path 56 to the heating terminal 90 can be quickly adjusted to the temperature of the heating medium required by the heating terminal 90. Even when the temperature of the heat medium requested by the heating terminal 90 rises, it is possible to quickly respond to a change in the request at the heating terminal 90.

(Heating control process of the first embodiment; FIGS. 5 to 7)
Next, with reference to FIGS. 5 to 7, the contents of the heating control process executed by the control device 95 when heating is performed while operating the heat pump unit 20 in the present embodiment will be described. The control device 95 executes the heating control process of FIG. 5 while performing the heating while operating the heat pump unit 20.

  In S10, the control device 95 monitors that a predetermined time has elapsed. The predetermined time is, for example, 1 minute. When the predetermined time has elapsed, the control device 95 determines YES in S10, and proceeds to S12.

  In S12, the control device 95 determines whether or not the detected temperature of the thermistor T2 provided in the intermediate portion of the tank 30 is lower than a predetermined first threshold value TH1. The first threshold value TH1 is a temperature (for example, 80 ° C.) that is lower than the heat medium temperature (for example, 85 ° C.) immediately after being heated by the heat pump unit 20 by a certain temperature. The first threshold TH1 may be called a high temperature threshold.

  When the detected temperature of the thermistor T2 at this time is equal to or higher than the first threshold value TH1 (that is, when a high-temperature heat medium is stored from the top to the middle of the tank 30), the control device 95 performs S12. It is judged as NO and proceeds to S14. In S14, the control device 95 decreases the heating capacity of the heat pump unit 20 by one step. When S14 ends, the process returns to S10 again to monitor that a predetermined time has elapsed.

  On the other hand, when the detected temperature of the thermistor T2 at this time is lower than the first threshold value TH1 (that is, when a high-temperature heat medium is not stored up to the middle part of the tank 30), the controller 95 determines YES in S12. Judge and proceed to S16.

  In S16, the control device 95 determines whether or not the detected temperature of the thermistor T2 is equal to or higher than a predetermined second threshold value TH2. The second threshold TH2 is a temperature (for example, 45 ° C.) that is higher by a certain temperature than the heat medium temperature (for example, 40 ° C.) immediately after the heat radiation at the heating terminal 90. The second threshold TH2 may be referred to as a low temperature threshold.

  When the detected temperature of the thermistor T2 at this time is lower than the second threshold value TH2 (that is, when a low-temperature heat medium is stored from the lower part of the tank 30 to the intermediate part), the controller 95 determines in S16. It judges NO and advances to S18. In S18, the control device 95 increases the heating capacity of the heat pump unit 20 by one step. When S18 ends, the process returns to S10 again to monitor that a predetermined time has elapsed.

  On the other hand, when the detected temperature of the thermistor T2 at this time is equal to or higher than the second threshold value TH2 (that is, when neither a high-temperature heat medium nor a low-temperature heat medium is stored in the middle part of the tank 30), the control device 95 determines YES in S16, and proceeds to monitoring of S20 and S22. In the case of YES in S <b> 16, it can be rephrased as a case where a heat medium having an intermediate temperature is stored in the intermediate portion of the tank 30.

  In S20 and S22, the control device 95 monitors whether the fluctuation tendency of the heat storage amount in the tank 30 is an increasing tendency or a decreasing tendency. That is, in S20 and S22, the control device 95 monitors whether the detected temperature of the thermistor T2 reaches the first threshold value TH1 or lower or becomes lower than the second threshold value TH2.

  If the detected temperature of the thermistor T2 reaches or exceeds the first threshold value TH1 after the start of monitoring in S20 and S22, the control device 95 determines YES in S20 and proceeds to S24. In the case of YES in S20, it means that the heat storage amount in the tank 30 tends to increase with the time point determined as YES in S16. In S24, the control device 95 executes a capacity reduction process (see FIG. 6) described later.

  On the other hand, if the detected temperature of the thermistor T2 becomes lower than the second threshold TH2 after the start of monitoring in S20 and S22, the control device 95 determines YES in S22 and proceeds to S26. In the case of YES in S22, it means that the heat storage amount in the tank 30 tends to decrease with reference to the time point determined as YES in S16. In S26, the control device 95 executes a capacity increase process (see FIG. 7) described later.

(Capability reduction process of the first embodiment; FIG. 6)
With reference to FIG. 6, the content of the capability reduction process (see S24 in FIG. 5) will be described. In S40 of FIG. 6, the control device 95 starts counting the timer. The timer is built in the control device 95.

  Next, in S42, the control device 95 confirms that the detected temperature of the thermistor T2 is equal to or higher than the first threshold value TH1. If the increasing tendency of the heat storage amount in the tank 30 continues, the control device 95 determines YES in S42, and proceeds to S44. On the other hand, when the amount of heat stored in the tank 30 has changed from an increasing tendency to a decreasing tendency for some reason, as in the case where the temperature of the heating medium required by the heating terminal 90 changes suddenly, after the start of the capacity reduction process Even if it exists, the detection temperature of the thermistor T2 may become lower than 1st threshold value TH1. In this case, the control device 95 determines NO in S42, and proceeds to S56. In S56, the control device 95 resets the count of the timer started in S40. Thereafter, the capacity reduction process in FIG. 6 is terminated.

  In S <b> 44, the control device 95 determines whether or not the detected temperature of the thermistor T <b> 3 provided in the lower part of the tank 30 has reached or exceeded the first threshold value TH <b> 1. If the increasing tendency of the heat storage amount in the tank 30 continues and the detected temperature of the thermistor T3 reaches the first threshold value TH1 or more, the control device 95 determines YES in S44, and proceeds to S46. On the other hand, if the detected temperature of the thermistor T3 has not reached the first threshold value TH1, the control device 95 determines NO in S44 and returns to S42.

  In S46, the control device 95 determines whether or not the count time of the timer at the time when YES is determined in S44 is longer than 1 minute. Here, the count time of the timer at the time when YES is determined in S44 is necessary until the thermistor T3 detects the temperature equal to or higher than the first threshold TH1 after the thermistor T2 detects the temperature equal to or higher than the first threshold TH1. Means time. That is, it represents the speed at which the boundary between the high temperature layer and the intermediate temperature layer moves (falls) from the position of the thermistor T2 to the position of the thermistor T3 in the tank 30.

  When the count time of the timer is longer than 1 minute, the control device 95 determines YES in S46, and proceeds to S48. On the other hand, when the count time of the timer is 1 minute or less, the control device 95 determines NO in S46, and proceeds to S54. If NO in S46, it means that the boundary between the high temperature layer and the intermediate temperature layer has moved from the position of the thermistor T2 to the position of the thermistor T3 in the tank 30 at high speed. That is, it means that the heating capacity of the heat pump unit 20 is excessively higher than the heat radiation amount in the heating terminal 90. Therefore, in S54, the control device 95 decreases the heating capacity of the heat pump unit 20 by three stages at a time. When S54 ends, the process proceeds to S56.

  In S48, the control device 95 determines whether or not the count time of the timer at the time when YES is determined in S44 is longer than 3 minutes. When the count time of the timer is longer than 1 minute and shorter than 3 minutes, the control device 95 determines NO in S48, and proceeds to S52. If NO in S48, it means that the boundary between the high temperature layer and the intermediate temperature layer has moved from the position of the thermistor T2 to the position of the thermistor T3 in the tank 30 at a medium speed. That is, it means that the heating capacity of the heat pump unit 20 is relatively high as compared with the heat radiation amount in the heating terminal 90. Therefore, in S52, the control device 95 decreases the heating capability of the heat pump unit 20 by two steps at a time. When S52 ends, the process proceeds to S56.

  On the other hand, when the count time of the timer is longer than 3 minutes, the control device 95 determines YES in S48, and proceeds to S50. If YES in S48, it means that the boundary between the high temperature layer and the intermediate temperature layer has moved at a low speed from the position of the thermistor T2 to the position of the thermistor T3 in the tank 30. That is, it means that the heating capacity of the heat pump unit 20 is slightly higher than the heat radiation amount in the heating terminal 90. Therefore, in S50, the control device 95 decreases the heating capacity of the heat pump unit 20 by one step. When S50 ends, the process proceeds to S56.

  In S56, the control device 95 resets the count of the timer. Thereafter, the capacity reduction process in FIG. 6 is terminated. When the capacity reduction process in FIG. 6 (S24 in FIG. 5) ends, the process returns to S10 in FIG. 5 again to monitor that a predetermined time has elapsed.

(Capability increase processing of the first embodiment; FIG. 7)
With reference to FIG. 7, the contents of the capacity increase process (see S26 in FIG. 5) will be described. In S70 of FIG. 7, the control device 95 starts counting the timer.

  Next, in S72, the control device 95 confirms that the detected temperature of the thermistor T2 is lower than the second threshold value TH2. If the decreasing tendency of the heat storage amount in the tank 30 continues, the control device 95 determines YES in S72 and proceeds to S74. On the other hand, when the amount of heat stored in the tank 30 has changed from a decreasing trend to an increasing trend for some reason, such as when the temperature of the heating medium required by the heating terminal 90 has suddenly changed, Even if it exists, the detection temperature of the thermistor T2 may become more than 2nd threshold value TH2. In this case, the control device 95 determines NO in S72, and proceeds to S86. In S86, the control device 95 resets the count of the timer started in S70. Thereafter, the capacity increase process in FIG. 7 is terminated.

  In S74, the control device 95 determines whether or not the detected temperature of the thermistor T1 provided in the upper part of the tank 30 is lower than the second threshold value TH2. If the decreasing tendency of the heat storage amount in the tank 30 continues and the detected temperature of the thermistor T1 becomes lower than the second threshold value TH2, the control device 95 determines YES in S74 and proceeds to S76. On the other hand, when the detected temperature of the thermistor T1 is not lower than the second threshold value TH2, the control device 95 determines NO in S74 and returns to S72.

  In S76, the control device 95 determines whether or not the count time of the timer at the time when YES is determined in S74 is longer than 1 minute. Here, the count time of the timer at the time when YES is determined in S74, it is necessary until the thermistor T1 detects a temperature lower than the second threshold value TH2 after the thermistor T2 detects a temperature lower than the second threshold value TH2. Means time. That is, it represents the speed at which the boundary between the low temperature layer and the intermediate temperature layer moves (rises) from the position of the thermistor T2 to the position of the thermistor T1 in the tank 30.

  When the count time of the timer is longer than 1 minute, the control device 95 determines YES in S76, and proceeds to S78. On the other hand, when the count time of the timer is 1 minute or less, the control device 95 determines NO in S76, and proceeds to S84. If NO in S76, it means that the boundary between the low temperature layer and the intermediate temperature layer has moved from the position of the thermistor T2 to the position of the thermistor T1 in the tank 30 at high speed. That is, it means that the heating capacity of the heat pump unit 20 is excessively lower than the heat dissipation amount in the heating terminal 90. Therefore, in S84, the control device 95 increases the heating capacity of the heat pump unit 20 by three stages at a time. When S84 ends, the process proceeds to S86.

  In S78, the control device 95 determines whether or not the count time of the timer at the time when YES is determined in S74 is longer than 3 minutes. When the count time of the timer is longer than 1 minute and shorter than 3 minutes, the control device 95 determines NO in S78 and proceeds to S82. If NO in S78, it means that the boundary between the low temperature layer and the intermediate temperature layer has moved from the position of the thermistor T2 to the position of the thermistor T1 in the tank 30 at a medium speed. That is, it means that the heating capacity of the heat pump unit 20 is relatively low as compared with the heat radiation amount in the heating terminal 90. Therefore, in S82, the control device 95 increases the heating capacity of the heat pump unit 20 by two steps at a time. When S82 ends, the process proceeds to S86.

  On the other hand, when the count time of the timer is longer than 3 minutes, the control device 95 determines YES in S78, and proceeds to S80. If YES in S78, it means that the boundary between the low temperature layer and the intermediate temperature layer has moved at a low speed from the position of the thermistor T2 to the position of the thermistor T1 in the tank 30. That is, it means that the heating capacity of the heat pump unit 20 is slightly lower than the heat dissipation amount in the heating terminal 90. Therefore, in S80, the control device 95 increases the heating capacity of the heat pump unit 20 by one step. When S80 ends, the process proceeds to S86.

  In S86, the control device 95 resets the count of the timer. Thereafter, the capacity increase process in FIG. 7 is terminated. When the capacity increase process in FIG. 7 (S26 in FIG. 5) is completed, the process returns to S10 in FIG. 5 again to monitor whether a predetermined time has elapsed.

  The control device 95 repeatedly executes the heating control process (S10 to S26) in FIG. 5 until the user instructs the stop of the heating. When the stop of heating is instructed by the user, the control device 95 ends the heating control process.

  The configuration and operation content of the hot water supply / heating system 10 according to the present embodiment have been described above. As described above, the control device 95 determines the time required for the thermistor T3 to detect the temperature equal to or higher than the first threshold TH1 after the thermistor T2 detects the temperature equal to or higher than the first threshold TH1 (YES in S44 of FIG. 6). The heating capacity of the heat pump unit 20 is reduced according to the count time of the timer when it is determined (see S50, S52, and S54 in FIG. 6). Similarly, the controller 95 detects the time required for the thermistor T1 to detect a temperature lower than the second threshold value TH2 after the thermistor T2 detects a temperature lower than the second threshold value TH2 (YES in S74 of FIG. 7). The heating capacity of the heat pump unit 20 is increased in accordance with the count time of the timer at the determined time (see S80, S82, and S84 in FIG. 7). That is, the control device 95 can change the heating capacity of the heat pump unit 20 according to the heat storage speed to the tank 30 or the heat release speed from the tank 30. Therefore, the hot water supply and heating system 10 of the present embodiment refers to the count time of the timer (that is, the heat storage speed to the tank 30 or the heat dissipation speed from the tank 30) regardless of the capacity of the tank 30, so that the current heat pump The amount of deviation (unbalance amount) between the heating capacity of the unit 20 and the amount of heat released from the heating terminal 90 can be estimated, and the tank 30 becomes in a state of insufficient heat storage (hot water shortage) due to excessive heat dissipation or excessive heat storage. The heat pump unit 20 can be operated with an appropriate heating capacity before 30 is fully charged. Therefore, according to the present embodiment, even when the small capacity tank 30 is used, the heat pump unit 20 can be operated with an appropriate heating capacity suitable for the heat radiation amount in the heating terminal 90.

  In this embodiment, the control device 95 changes the amount of change in the heating capacity of the heat pump unit 20 according to the length of the count time of the timer (S46 to S54 in FIG. 6 and S76 to S84 in FIG. 7). reference). Therefore, in the hot water supply and heating system 10 of the present embodiment, the heat pump unit 20 can be operated with an appropriate heating capacity depending on the situation.

  The correspondence with the description of the claims of this embodiment will be described. The thermistors T1, T2, and T3 are examples of “detecting means”. The heat storage outward path 34 and the heat storage return path 32 are examples of the “heat storage circulation path”. The heating forward path 56 and the heating return path 60 are examples of the “heat radiation circulation path”. The time required from when the thermistor T2 detects the temperature equal to or higher than the first threshold value TH1 to when the thermistor T3 detects the temperature equal to or higher than the first threshold value TH1 (the timer count when it is determined YES in S44 of FIG. 6) Time) and the time required from when the thermistor T2 detects a temperature lower than the second threshold TH2 to when the thermistor T1 detects a temperature lower than the second threshold TH2 (YES in S74 of FIG. 7) The count time of the timer at the time) is an example of “difference time”.

(Second embodiment)
A description will be given centering on differences from the first embodiment. The basic configuration of the hot water supply and heating system 100 of the present embodiment is common to the hot water supply and heating system 10 of the first embodiment. However, as shown in FIG. 8, in the hot water supply and heating system 100 of the present embodiment, the tank 30 is provided with four thermistors T1, T2, T3, and T4 in order from the upper side in the height direction of the tank 30. This is different from the hot water supply / heating system 10 of the first embodiment. The thermistors T1, T2, T3, and T4 are all connected to the control device 95. Moreover, in the hot water supply and heating system 100 of the present embodiment, the contents of the heating control process (FIGS. 9 to 11) executed by the control device 95 are also different from those of the first embodiment. The heating control process of the present embodiment is the first implementation in that four thermistors are used (thermistors T1 to T4), and the threshold of the heat medium temperature that is a criterion for determination is only the first threshold TH1. Different from the example.

(Heating control process of 2nd Example; FIGS. 9-11)
Then, with reference to FIGS. 9-11, the content of the heating control process in a present Example is demonstrated. In the present embodiment, the control device 95 performs the heating control process of FIG. 9 while heating is performed while operating the heat pump unit 20.

  In S110, the control device 95 monitors that a predetermined time has elapsed. When a predetermined time (for example, 1 minute) elapses, the control device 95 determines YES in S110, and proceeds to S112.

  In S112, the control device 95 determines whether or not the detected temperature of the thermistor T2 provided second from the top is equal to or higher than a predetermined first threshold value TH1. The first threshold value TH1 is the same as that in the first embodiment.

  When the detected temperature of the thermistor T2 at this time is equal to or higher than the first threshold value TH1 (that is, when a high-temperature heat medium is accumulated from the top of the tank 30 to the vicinity of the upper middle portion), the control device 95 Determines YES in S112 and proceeds to S116. On the other hand, when the detected temperature of the thermistor T2 at this time is lower than the first threshold value TH1 (that is, when a high-temperature heat medium is not stored near the upper portion of the intermediate portion of the tank 30), the control device 95 performs S112. Is NO and the process proceeds to S114. In S <b> 114, the control device 95 increases the heating capacity of the heat pump unit 20 by one step. When S114 ends, the process returns to S110 again to monitor whether a predetermined time has elapsed.

  In S116, the control device 95 determines whether or not the detected temperature of the third thermistor T3 from the top is lower than the first threshold value TH1. When the detected temperature of the thermistor T3 at this time is lower than the first threshold value TH1 (that is, a high-temperature heat medium is stored up to the vicinity of the upper part of the intermediate part of the tank 30, but reaches the vicinity of the lower part of the intermediate part of the tank 30) In the case where the high-temperature heat medium has not been stored until that time), the control device 95 determines YES in S116, and proceeds to monitoring in S120 and S122. On the other hand, when the detected temperature of the thermistor T3 at this time is equal to or higher than the first threshold value TH1 (that is, when a high-temperature heat medium is accumulated near the lower portion of the intermediate portion of the tank 30), the control device 95 determines NO in S116, and proceeds to S118. In S118, the control device 95 reduces the heating capacity of the heat pump unit 20 by one step. When S118 ends, the process returns to S110 again to monitor that a predetermined time has elapsed.

  In S120 and S122, the control device 95 monitors whether the fluctuation tendency of the heat storage amount in the tank 30 is an increasing tendency or a decreasing tendency. That is, in S120 and S122, the control device 95 monitors whether the detected temperature of the thermistor T3 reaches the first threshold value TH1 or higher, or whether the detected temperature of the thermistor T2 is lower than the first threshold value TH1.

  When the detected temperature of the thermistor T3 reaches the first threshold value TH1 or more after the monitoring of S120 and S122 is started, the control device 95 determines YES in S120 and proceeds to S124. If YES in S120, this means that the amount of heat stored in the tank 30 tends to increase with the time point determined as YES in S116. In S124, the control device 95 executes a capacity reduction process (see FIG. 10) described later.

  On the other hand, if the detected temperature of the thermistor T2 becomes lower than the first threshold TH1 after the start of monitoring in S120 and S122, the control device 95 determines YES in S122 and proceeds to S126. In the case of YES in S122, it means that the amount of heat stored in the tank 30 is decreasing with reference to the time point determined as YES in S116. In S126, the control device 95 executes a capacity increase process (see FIG. 11) described later.

(Capability reduction process of the second embodiment; FIG. 10)
With reference to FIG. 10, the content of the capability reduction process (see S124 in FIG. 9) will be described. In S140 in FIG. 10, the control device 95 starts counting the timer.

  Next, in S142, the control device 95 confirms that the detected temperature of the thermistor T3 is equal to or higher than the first threshold value TH1. If the increasing tendency of the heat storage amount in the tank 30 continues, the control device 95 determines YES in S142 and proceeds to S144. On the other hand, when the amount of heat stored in the tank 30 has changed from an increasing tendency to a decreasing tendency for some reason, as in the case where the temperature of the heating medium required by the heating terminal 90 changes suddenly, after the start of the capacity reduction process Even if it exists, the detection temperature of the thermistor T3 may become lower than 1st threshold value TH1. In this case, the control device 95 determines NO in S142, and proceeds to S156. In S156, the control device 95 resets the count of the timer started in S140. Thereafter, the capacity reduction process in FIG. 10 is terminated.

  In S144, the control device 95 determines whether or not the detected temperature of the thermistor T4 provided in the lower portion of the tank 30 has reached or exceeded the first threshold value TH1. If the increasing tendency of the heat storage amount in the tank 30 continues and the detected temperature of the thermistor T4 reaches the first threshold value TH1 or more, the control device 95 determines YES in S144, and proceeds to S146. On the other hand, if the detected temperature of the thermistor T4 has not reached the first threshold value TH1, the control device 95 determines NO in S144, and returns to S142.

  In S146, the control device 95 determines whether or not the count time of the timer at the time when YES is determined in S144 is longer than 1 minute. Here, the count time of the timer at the time when YES is determined in S144 is necessary until the thermistor T4 detects the temperature equal to or higher than the first threshold TH1 after the thermistor T3 detects the temperature equal to or higher than the first threshold TH1. Means time. That is, it represents the speed at which the boundary between the high temperature layer and the intermediate temperature layer moves (falls) from the position of the thermistor T3 to the position of the thermistor T4 in the tank 30.

  When the count time of the timer is longer than 1 minute, the control device 95 determines YES in S146, and proceeds to S148. On the other hand, when the count time of the timer is 1 minute or less, the control device 95 determines NO in S146, and proceeds to S154. If NO in S146, it means that the boundary between the high temperature layer and the intermediate temperature layer has moved from the position of the thermistor T3 to the position of the thermistor T4 in the tank 30 at high speed. That is, it means that the heating capacity of the heat pump unit 20 is excessively higher than the heat radiation amount in the heating terminal 90. Therefore, in S154, the control apparatus 95 reduces the heating capability of the heat pump unit 20 by three steps at a time. When S154 ends, the process proceeds to S156.

  In S148, the control device 95 determines whether the count time of the timer at the time when YES is determined in S144 is longer than 3 minutes. When the count time of the timer is longer than 1 minute and shorter than 3 minutes, the control device 95 determines NO in S148, and proceeds to S152. If NO in S148, it means that the boundary between the high temperature layer and the medium temperature layer has moved from the position of the thermistor T3 to the position of the thermistor T4 in the tank 30 at a medium speed. That is, it means that the heating capacity of the heat pump unit 20 is relatively high as compared with the heat radiation amount in the heating terminal 90. Therefore, in S152, the control device 95 decreases the heating capacity of the heat pump unit 20 by two steps at a time. When S152 ends, the process proceeds to S156.

  On the other hand, when the count time of the timer is longer than 3 minutes, the control device 95 determines YES in S148, and proceeds to S150. If YES in S148, it means that the boundary between the high temperature layer and the intermediate temperature layer has moved at a low speed from the position of the thermistor T3 to the position of the thermistor T4 in the tank 30. That is, it means that the heating capacity of the heat pump unit 20 is slightly higher than the heat radiation amount in the heating terminal 90. Therefore, in S150, the control device 95 decreases the heating capacity of the heat pump unit 20 by one step. When S150 ends, the process proceeds to S156.

  In S156, the control device 95 resets the count of the timer. Thereafter, the capacity reduction process in FIG. 10 is terminated. When the capacity reduction process in FIG. 10 (S124 in FIG. 9) ends, the process returns to S110 in FIG. 9 again to monitor whether a predetermined time has elapsed.

(Capability increasing process of the second embodiment; FIG. 11)
With reference to FIG. 11, the content of the capability increase process (see S126 of FIG. 9) will be described. In S170 of FIG. 11, the control device 95 starts counting the timer.

  Next, in S172, the control device 95 confirms that the detected temperature of the thermistor T2 is lower than the first threshold value TH1. If the decreasing tendency of the heat storage amount in the tank 30 continues, the control device 95 determines YES in S172, and proceeds to S174. On the other hand, when the amount of heat stored in the tank 30 has changed from a decreasing trend to an increasing trend for some reason, such as when the temperature of the heating medium required by the heating terminal 90 has suddenly changed, Even if it exists, the detection temperature of the thermistor T2 may become more than 1st threshold value TH1. In this case, the control device 95 determines NO in S172, and proceeds to S186. In S186, the control device 95 resets the count of the timer started in S170. Thereafter, the capacity increase process in FIG. 11 is terminated.

  In S174, the control device 95 determines whether or not the detected temperature of the thermistor T1 provided in the upper part of the tank 30 has become lower than the first threshold value TH1. If the decreasing tendency of the heat storage amount in the tank 30 continues and the detected temperature of the thermistor T1 becomes lower than the first threshold value TH1, the control device 95 determines YES in S174, and proceeds to S176. On the other hand, when the detected temperature of the thermistor T1 is not lower than the first threshold value TH1, the control device 95 determines NO in S174, and returns to S172.

  In S176, the control device 95 determines whether the count time of the timer at the time when YES is determined in S174 is longer than one minute. Here, the count time of the timer at the time when YES is determined in S174, it is necessary until the thermistor T1 detects a temperature lower than the first threshold value TH1 after the thermistor T2 detects a temperature lower than the first threshold value TH1. Means time. That is, it represents the speed at which the boundary between the high temperature layer and the intermediate temperature layer moves (rises) from the position of the thermistor T2 to the position of the thermistor T1 in the tank 30.

  When the count time of the timer is longer than 1 minute, the control device 95 determines YES in S176, and proceeds to S178. On the other hand, when the count time of the timer is 1 minute or less, the control device 95 determines NO in S176, and proceeds to S184. In the case of NO in S176, it means that the boundary between the high temperature layer and the intermediate temperature layer has moved from the position of the thermistor T2 to the position of the thermistor T1 in the tank 30 at high speed. That is, it means that the heating capacity of the heat pump unit 20 is excessively lower than the heat dissipation amount in the heating terminal 90. Therefore, in S184, the control device 95 increases the heating capacity of the heat pump unit 20 by three stages at a time. When S184 ends, the process proceeds to S186.

  In S178, the control device 95 determines whether or not the count time of the timer when it is determined YES in S174 is longer than 3 minutes. When the count time of the timer is longer than 1 minute and shorter than 3 minutes, the control device 95 determines NO in S178, and proceeds to S182. In the case of NO in S178, it means that the boundary between the high temperature layer and the medium temperature layer has moved from the position of the thermistor T2 to the position of the thermistor T1 in the tank 30 at a medium speed. That is, it means that the heating capacity of the heat pump unit 20 is relatively low as compared with the heat radiation amount in the heating terminal 90. Therefore, in S182, the control device 95 increases the heating capacity of the heat pump unit 20 by two steps at a time. When S182 ends, the process proceeds to S186.

  On the other hand, when the count time of the timer is longer than 3 minutes, the control device 95 determines YES in S178, and proceeds to S180. If YES in S178, it means that the boundary between the high temperature layer and the medium temperature layer has moved from the position of the thermistor T2 to the position of the thermistor T1 in the tank 30 at a low speed. That is, it means that the heating capacity of the heat pump unit 20 is slightly lower than the heat dissipation amount in the heating terminal 90. Therefore, in S180, the control device 95 increases the heating capacity of the heat pump unit 20 by one step. When S180 ends, the process proceeds to S186.

  In S186, the control device 95 resets the timer count. Thereafter, the capacity increase process in FIG. 11 is terminated. When the ability increase process in FIG. 11 (S126 in FIG. 9) is completed, the process returns to S110 in FIG.

  The control device 95 repeatedly executes the heating control process (S110 to S126) of FIG. 9 until the user instructs to stop the heating. When the stop of heating is instructed by the user, the control device 95 ends the heating control process.

  Heretofore, the configuration and operation details of the hot water supply / heating system 100 of the present embodiment have been described. The hot water supply and heating system 100 of the present embodiment can also exhibit the same operational effects as the hot water supply and heating system 10 of the first embodiment. In this embodiment, the thermistors T1, T2, T3, and T4 are examples of “detecting means”. The time required from when the thermistor T3 detects the temperature equal to or higher than the first threshold value TH1 to when the thermistor T4 detects the temperature equal to or higher than the first threshold value TH1 (the timer count when it is determined YES in S144 of FIG. 10) Time) and the time required for the thermistor T1 to detect a temperature lower than the first threshold TH1 after the thermistor T2 detects a temperature lower than the first threshold TH1 (YES in S174 of FIG. 11). The count time of the timer at the time) is an example of “difference time”.

  Each embodiment has been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  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 has technical usefulness by achieving one of the objects.

DESCRIPTION OF SYMBOLS 10,100: Hot water supply heating system 20: Heat pump unit 22: Circulation pump 24: Manual valve 28: Tank unit 30: Tank 32: Heat storage return path 34: Heat storage outbound path 44: Heat storage outbound thermistor 46: Heat storage return thermistor 48: Heating outbound path Thermistor 50: Drain pipe 52: Manual valve 56: Heating path 58: Heating path thermistor 60: Heating return path 62: Heating return path thermistor 64: Bypass path 66: Mixing valve 70: Expansion tank 80: Hot water supply heating unit 82: Hot water supply pipe Path 84: Burner 86: Burner 87: Circulation pump 90: Heating terminal 95: Control devices T1, T2, T3, T4: Thermistor

Claims (2)

A heat pump for heating the heat medium;
A tank for storing the heat medium,
A plurality of detection means for detecting the temperature of the heat medium in the tank;
A heating terminal for heating using the heat of the heat medium;
A heat storage circulation path for circulating a heat medium between the heat pump and the tank;
A heat dissipation circulation path for circulating a heat medium between the tank and the heating terminal;
A control device;
With
The plurality of detection means includes a first detection means for detecting the temperature of the heat medium at a predetermined position in the tank, and a second detection means for detecting the temperature of the heat medium at a position different from the first detection means. And detecting means,
In the case where the control device performs heating at the heating terminal while operating the heat pump, the difference time required until the specific temperature is also detected by the second detection means after the specific temperature is detected by the first detection means. In response, change the heating capacity of the heat pump,
Heating device. The control device
When the difference time is the first time, the heating capacity of the heat pump is changed by the first change amount,
When the difference time is the second time shorter than the first time, the heating capacity of the heat pump is changed by a second change amount larger than the first change amount.
The heating device according to claim 1.

Images