JP2013213619A - Heat supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat supply system which can attempt to do saving of energy in freeze prevention operations.SOLUTION: The heat supply system includes a heat source device 1, a terminal for heating 2 which obtains heat from the heat source device to operate, a heat medium circulation passage 3 which connects the heat source device 1 with the terminal for heating 2, and a circulating pump 36 making a heat medium circulate. The heat supply system includes a temperature detection part 111 which detects the temperature of open air or the heat medium and a control device 9 which can perform freeze prevention operations. When the temperature detection part 111 detects the temperature of a first temperature region, the freeze prevention operation circulates the heat medium with the circulating pump 36 without making a heat medium heating with the heat source device 1. Moreover, when the temperature detection part 111 detects the temperature of a second temperature region lower than the first temperature region, the freeze prevention operation is characterized by making the heat medium heating with the heat source device 1 to circulate the heat medium with the circulating pump 36.

Description

  The present invention relates to a heat supply system.

  Conventionally, a heat source device for supplying heat to a heating terminal, a heat medium circulation path connecting the heat source device and the heating terminal, and a hot water supply flow connected to a water supply source and connected to the heat source device in the middle A heat supply system including a passage is known (see, for example, Patent Document 1).

  The heat supply system of Patent Document 1 includes a heating burner, a heating terminal, and a heat medium circulation path. The heating medium circulation path connects the heating burner and the heating terminal. As a result, the heating terminal operates by obtaining heat from the heating burner.

JP 2010-223490 A

  Incidentally, in the heat supply system as described above, the heat medium in the heat medium circuit may freeze if it remains in the pipe without circulating in the winter. Therefore, this conventional heat supply system performs the freeze prevention operation when the outside air temperature or the like becomes low.

  In the freeze prevention operation in the conventional heat supply system, when the outside air temperature or the like becomes low, the heating medium is heated by a heating burner, and the heated heating medium is circulated in the heating medium circulation path. However, it is not preferable from the viewpoint of energy saving to drive the heating burner to heat the heating medium every time the freeze prevention operation is performed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat supply system capable of saving energy in the freeze prevention operation.

  The heat supply system of the present invention includes a heat source device, a heating terminal that operates by obtaining heat from the heat source device, and a heat medium circulation path through which the heat medium flows by connecting the heat source device and the heating terminal. A heat supply system that circulates the heat medium provided in the heat medium circulation path, and a temperature detection unit that detects the temperature of the outside air or the heat medium, and controls the circulation pump And a control device capable of controlling the heat source device and executing the freeze prevention operation, wherein the freeze prevention operation is performed by the heat source device when the temperature detection unit detects the temperature in the first temperature range. The heating medium is circulated by the circulation pump without heating, and the heating medium is heated by the heat source device when the temperature detection unit detects the temperature in the second temperature range lower than the first temperature range. And let the heat pump And characterized in that to the ring.

  In the heat supply system of the present invention, the heat source device is capable of switching between at least a first heating amount and a second heating amount larger than the first heating amount, and the freeze prevention operation. It is preferable that the heat source device is switched from the first heating amount to the second heating amount when the temperature detecting unit detects a predetermined temperature or lower in the second temperature range.

  In the heat supply system of the present invention, the circulation pump can be switched at least between a first circulation flow rate and a second circulation flow rate larger than the first circulation flow rate, and the freeze prevention operation. Is that the circulation pump is switched from the first circulation flow rate to the second circulation flow rate when the temperature detection unit detects a predetermined temperature or lower in the first temperature range or the second temperature range. Preferably there is.

  In performing the freeze prevention operation, the heat supply system of the present invention causes the heat medium to circulate without driving the heat source device and to execute the freeze prevention operation when the temperature of the outside air or the like reaches the first temperature range. Then, when the temperature reaches a lower temperature range of the second temperature range, the heat source device is driven and the heated heat medium is circulated to perform the freeze prevention operation.

  As a result, according to the heat supply system of the present invention, it is possible to perform the freeze prevention operation according to the temperature such as the outside air temperature, and to save energy.

It is a whole lineblock diagram of the heat supply system of this embodiment. It is a block diagram of the control apparatus of this embodiment. The heating amount / circulation flow rate table of this embodiment is shown. The flowchart of this embodiment is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the heat supply system of the present embodiment includes a heat source device 1, a heating terminal 2, a heat medium circulation path 3, a heating tank 4, a hot water supply flow path 8, and a control device 9. And. The heat supply system also includes a reheating circuit 5 for reheating the bath water. The heat supply system includes a heat source unit 11 for a heating circuit and a heat source unit 15 of a hot water supply channel 8 as the heat source device 1. That is, the heat supply system of the present embodiment is a so-called two-can three-channel heat supply system. In addition, water is used for the heat medium of the heat supply system of this embodiment.

  The heat source device 1 includes a first heat source unit 11 and a second heat source unit 15. The heat source device 1 is provided to supply heat to the heating terminal 2. The first heat source unit 11 heats the heat medium flowing through the heat medium circulation path 3. The second heat source unit 15 heats the water flowing through the hot water supply channel 8. The first heat source unit 11 and the second heat source unit 15 include gas burners 12 and 16, sensible heat exchangers 13 and 17, and latent heat exchangers 14 and 18, respectively.

  A gas supply path 121 is connected to the gas burners 12 and 16. The gas supply path 121 supplies fuel gas to the gas burners 12 and 16. Examples of the fuel gas include city gas and propane gas. The gas burners 12 and 16 can be switched in stages to a plurality of heating amounts. The gas burners 12 and 16 of this embodiment can be switched at least between a first heating amount and a second heating amount. Note that switching of the heating amount of the gas burners 12 and 16 is controlled by the control device 9.

  The sensible heat exchangers 13 and 17 collect the sensible heat of the exhaust gas from the gas burners 12 and 16. The latent heat exchangers 14 and 18 recover the latent heat of the exhaust gas from the gas burner 12. The latent heat exchangers 14 and 18 are configured to exchange heat with the exhaust gas after heat exchange with the sensible heat exchangers 13 and 17. In addition, the exhaust gas which passed through the latent heat exchangers 14 and 18 is condensed and changed into a liquid, and is discharged through the drain.

  In the first heat source unit 11, the sensible heat exchanger 13 and the latent heat exchanger 14 are connected via a first heat exchange intermediate flow path 31. The first heat exchange intermediate flow path 31 is a part of the heat medium circulation path 3. The first heat exchange intermediate flow path 31 is connected between the heat medium outlet 142 of the latent heat exchanger 14 and the heat medium inlet 131 of the sensible heat exchanger 13. The first heat exchange intermediate flow path 31 includes a tank return path 32 and a tank forward path 33. The tank return path 32 connects the heat medium outlet 142 of the latent heat exchanger 14 and the inlet 41 of the heating tank 4. The tank outward path 33 connects the outlet 42 of the heating tank 4 and the heat medium inlet 131 of the sensible heat exchanger 13.

  In the second heat source unit 15, the sensible heat exchanger 17 and the latent heat exchanger 18 are connected via a second heat exchange intermediate flow path 81. The second heat exchange intermediate flow path 81 connects the outlet 182 of the latent heat exchanger 18 of the second heat source unit 15 and the inlet 171 of the sensible heat exchanger 17 in communication.

  The heat source device 1 is not limited to the gas burners 12 and 16 and may be one that heats a heat medium or hot water using exhaust heat. The heat source device 1 may be, for example, a prime mover-driven power generation device. A prime mover-driven power generator generates electricity and exhaust heat. By using a prime mover-driven power generation device as the heat source device 1, a so-called cogeneration system can be configured.

  The heating terminal 2 obtains heat from the heat source device 1 and operates. Specifically, the heating terminal 2 obtains heat from the heat source device 1 through a heat medium. One or more heating terminals 2 are provided. Note that a valve (for example, a thermal valve) is provided at the heat medium inlet 21 of the heating terminal 2. This valve is controlled to open and close by a control device 9.

  The heat medium circulation path 3 connects the heat source device 1 and the heating terminal 2. A heat medium circulates in the heat medium circulation path 3. The heat medium circulation path 3 includes a circulation outward path 34, a circulation return path 35, and the first heat exchange intermediate flow path 31 described above. The circulation path 34 connects the heat medium outlet 132 of the sensible heat exchanger 13 and the heat medium inlet 21 of the heating terminal 2. The circulation return path 35 connects the heat medium outlet 22 in the heating terminal 2 and the heat medium inlet 141 of the latent heat exchanger 14. A circulation pump 36 is connected in the middle of the heat medium circulation path 3. Thus, the heat medium circulates in the heat medium circulation path 3 and circulates between the heat source device 1 and the heating terminal 2.

  The circulation pump 36 includes a motor. The motor is configured such that the rotational speed is changed by the control device 9. In other words, the circulation pump 36 is configured to change the circulation flow rate. The circulation pump 36 can be switched in stages to a plurality of circulation flow rates. The circulation pump 36 of the present embodiment can be switched at least between the first circulation flow rate and the second circulation flow rate.

  The heating tank 4 is used to absorb a volume change caused by expansion / contraction of the heat medium accompanying heating. The heating tank 4 includes an inlet 41 and an outlet 42. A heating medium is stored inside the heating tank 4. The inlet 41 allows the heat medium to flow into the heating tank 4. The outlet 42 allows the heat medium to flow out of the heating tank 4. The inflow port 41 is connected to the heat medium outlet 142 of the latent heat exchanger 14 via the tank return path 32. The outlet 42 is connected to the heat medium inlet 131 of the sensible heat exchanger 13 via the tank forward path 33. In other words, the heating tank 4 is connected in the middle of the heat medium circulation path 3.

  The heating tank 4 may be a sealed heating tank 4 or an open heating tank 4.

  The hot water supply channel 8 includes a water supply channel 82, a hot water supply channel 83, and the second heat exchange intermediate channel 81 described above. The upstream end of the water supply channel 82 is connected to a water supply source. The water supply source is, for example, a water pipe. The downstream end of the water supply path 82 is connected to the inlet 181 of the latent heat exchanger 14 in the second heat source unit 15. The upstream end of the hot water supply channel 83 is connected to the outlet 172 of the sensible heat exchanger 13 in the second heat source unit 15. In other words, the heat source device 1 is connected to the hot water supply channel 8 in the middle thereof.

  The hot water supply channel 8 is provided with a bypass channel 84 so as to bypass the heat source device 1. The bypass passage 84 connects the water supply passage 82 and the hot water supply passage 83 before and after the heat source device 1. Further, a valve (for example, a water amount adjusting valve such as a stepping motor or a servo motor) 85 is connected to the bypass channel 84.

  A reheating circuit 5 is connected to the heat medium circulation path 3. The chasing circuit 5 is provided for chasing bath water. The upstream end of the chase circuit 5 is connected in the middle of the circulation forward path 34. The downstream end of the chase circuit 5 is connected in the middle of the circulation return path 35. The tracking circuit 5 includes a tracking heat exchanger 51, a tracking heat medium path 52, and a tracking circuit 6.

  The reheating heat exchanger 51 is provided in the middle of the reheating heat medium path 52. The reheating heat exchanger 51 is connected to the heat medium circulation path 3 so as to be in parallel with the heating terminal 2. In other words, the chase circuit 5 is provided in the heat medium circulation path 3 so as to be in parallel with the heating terminal 2. The reheating heat exchanger 51 performs heat exchange between bath water and a heat medium. A valve (for example, a thermal valve) 53 is provided in the middle of the reheating heat medium path 52. When the valve 53 is opened, the heat medium flows through the reheating heat medium path 52. Further, when the valve 53 is closed, the heat medium does not flow through the reheating heat medium path 52.

  The chasing circulation path 6 connects the bathtub 64 and the chasing heat exchanger 51. The chasing circulation path 6 is provided for chasing bath water. The follow-up circulation path 6 includes a rough forward path 61 and a short return path 62. The bathtub 64 includes a suction port 65 and a discharge port 66. The bath way 61 connects the inlet 65 of the bathtub 64 and the reheating heat exchanger 51. The bath return path 62 connects the reheating heat exchanger 51 and the discharge port 66 of the bathtub 64. A bath water pump 63 is connected to the reheating circulation path 6. Thereby, the bath water circulates in the chasing circulation path 6.

  The heat supply system of this embodiment includes a temperature detection unit 111 (see FIG. 2). The temperature detector 111 detects the temperature of the outside air. When the temperature detection unit 111 detects the temperature of the outside air, the temperature detection unit 111 outputs the temperature value to the control device 9.

  The temperature detector 111 may detect the temperature of the heat medium. Moreover, the temperature detection part 111 may detect the temperature of pool water and a temperature conduction member, and may detect the temperature of external air indirectly.

  The control device 9 controls the heat source device 1. The control device 9 controls driving of various drive valves. Further, the control device 9 controls driving of the circulation pump 36 and the bath water pump 63. The control device 9 is composed of a computer whose main component is a microprocessor.

  As shown in FIG. 2, the control device 9 includes an operation control unit 90, a valve control unit 91, a pump control unit 92, and a heat source device control unit 93. The control device control unit 93 includes a first heat source control unit 94 and a second heat source control unit 95.

  A command signal from the remote control 112 is input to the operation control unit 90. The remote controller 112 is a remote controller for heating terminal that outputs a command for operation of the heating terminal 2, a remote controller for reheating that outputs a command for reheating bath water, and a remote controller that outputs a command for start of hot water supply or hot water temperature including. Based on the signal input from the remote control 112 or the like, the operation control unit 90 sends each operation (operation of the heating terminal 2 and reheating operation) to each unit of the heat source device control unit 93, the valve control unit 91, and the pump control unit 92.・ Output information based on hot water operation.

  The heat source device control unit 93 controls driving of the heat source device 1. The heat source device control unit 93 determines the behavior of the heat source device 1 according to each operation. That is, the heat source device control unit 93 drives either the first heat source unit 11 or the second heat source unit 15 based on each operation signal input from the operation control unit 90, or both. Decide whether to drive. Further, the heat source device control unit 93 also determines the heating amounts of the first heat source unit 11 and the second heat source unit 15. For example, when only the heating terminal 2 is operated, it is determined that the first heat source unit 11 is turned on and the second heat source unit 15 is turned off, and the heating amount of the first heat source unit 11 is also determined. When the signal from the operation control unit 90 is input, the heat source device control unit 93 outputs an ON / OFF signal and a heating amount signal to the first heat source control unit 94. Further, when the signal from the operation control unit 90 is input, the heat source device control unit 93 outputs an ON / OFF signal and a heating amount instruction signal to the second heat source control unit 95.

  The first heat source control unit 94 includes an ON / OFF control unit 941 and a heating amount control unit 942. The ON / OFF control unit 941 switches heating ON / OFF of the first heat source unit 11 when a signal from the heat source device control unit 93 is input. Specifically, the ON / OFF control unit 941 switches the presence or absence of combustion of the burner 12 by switching opening and closing of the fuel gas supply path 121.

  When the signal from the heat source device control unit 93 is input, the heating amount control unit 942 controls the heating amount of the first heat source unit 11. Specifically, the heating amount control unit 942 controls the heating amount of the burner 12 by adjusting the opening of a flow rate adjustment valve provided in the fuel gas supply path 121.

  The second heat source controller 95 also includes an ON / OFF controller 951 and a heating amount controller 952. When the signal from the heat source device control unit 93 is input, the ON / OFF control unit 951 switches the heating of the second heat source unit 15 ON / OFF. Specifically, the ON / OFF control unit 951 switches the presence or absence of combustion of the burner 16 by switching opening and closing of the fuel gas supply path 121.

  When the signal from the heat source device control unit 93 is input, the heating amount control unit 952 controls the heating amount of the second heat source unit 15. Specifically, the heating amount control unit controls the heating amount of the burner 16 by adjusting the opening of a flow rate adjustment valve provided in the fuel gas supply path 121.

  The valve control unit 91 controls opening / closing driving of the driving valve of each unit. When the signal from the operation control unit 90 is input, the valve control unit 91 determines the open / close state of the valve according to each operation, and performs open / close control.

  The pump control unit 92 controls driving of the circulation pump 36 and the bath water pump 63. When the signal from the operation control unit 90 is input, the pump control unit 92 performs ON / OFF control of the circulation pump 36 and the bath water pump 63 and control of the rotation speed of the motor according to each operation. The motor is controlled by inverter control. Thereby, the circulation flow rate of the heat medium in the heat medium circulation path 3 and the circulation flow rate of the bath water in the additional circulation path 6 are controlled.

  The control device 9 includes a comparison unit 96, a heating amount / circulation flow rate acquisition unit 98, and a freeze prevention operation control unit 97. The control device 9 includes a temperature threshold value memory 961 and a heating amount / circulation flow rate table memory 99.

  The threshold memory 961 stores a plurality of preset threshold temperatures. The threshold memory of this embodiment stores, for example, a first temperature, a second temperature, a third temperature, a fourth temperature, a fifth temperature, a sixth temperature, etc. as threshold temperatures. The second temperature is lower than the first temperature. The third temperature is lower than the second temperature. The fourth temperature is lower than the third temperature. The fifth temperature is lower than the fourth temperature. The sixth temperature is lower than the fifth temperature. The seventh temperature is lower than the sixth temperature.

  Further, the threshold memory stores a first temperature range and a second temperature range, as shown in FIG. The second temperature range is a temperature range lower than the first temperature range. The threshold memory stores the first temperature range and the threshold temperature in association with each other. The threshold memory stores the second temperature range and the threshold temperature in association with each other. For example, the first temperature range of the present embodiment is a temperature range that is equal to or lower than the first temperature and higher than the fourth temperature. The second temperature range is a temperature range equal to or lower than the fourth temperature. The temperature threshold memory 961 is configured by, for example, a nonvolatile memory.

  The temperature value detected by the temperature detection unit 111 is input to the comparison unit 96. The comparison unit 96 also receives a threshold temperature from the temperature threshold memory 961. The comparison unit 96 compares the threshold temperature input from the threshold memory 961 with the temperature value input from the temperature detection unit 111. The comparison unit determines which section of the plurality of threshold temperatures the temperature value input from the temperature detection unit 111 belongs to.

Interval T ₁ is greater section than and second temperature below the first temperature. Interval T ₂ are a larger section than and third temperature below the second temperature. Interval T ₃ is greater section than and fourth temperature below the third temperature. Interval T ₄ is greater section than and fifth temperature below the fourth temperature. Interval T ₅ are larger section than and sixth temperature in the fifth temperature below. Interval T ₆ is a sixth temperature following section.

  The comparison unit 96 outputs the result of the comparison determination to the heating amount / circulation flow rate acquisition unit 98. The heating amount / circulation flow rate acquisition unit 98 acquires the heating amount and the circulation flow rate corresponding to the section from the heating amount / circulation flow rate table memory 99, respectively.

In the heating amount / circulation flow rate table memory 99, as shown in FIG. 3, the heating amount and the circulation flow rate are assigned and stored corresponding to each section. 0 as a heating amount corresponding to the interval T ₁ (does not burn), the first circulation flow rate is assigned as the circulation flow rate. Interval 0 (no combustion) as a heating amount corresponding to T _2, the second circulation flow rate is assigned as the circulation flow rate. 0 as a heating amount corresponding to the interval T ₃ (does not burn), the third circulation flow rate is assigned as the circulation flow rate. A first heating amount is assigned as the heating amount corresponding to the section T4, and a _fourth circulation flow rate is assigned as the circulation flow rate. Second heating amount as the heating amount corresponding to the interval T _5, fifth circulation flow is assigned as a circulating flow. Third heat quantity as a heating amount corresponding to the interval T _6, a fifth flow rate is assigned as the circulation flow rate.

  The relationship between each circulation flow rate is as follows. The second circulation flow rate is larger than the first circulation flow rate. The third circulation flow rate is larger than the second circulation flow rate. The fourth circulation flow rate is larger than the third circulation flow rate. The fifth circulation flow rate is larger than the fourth circulation flow rate.

  Moreover, the relationship of each heating amount is as follows. The second heating amount is larger than the first heating amount. The third heating amount is larger than the second heating amount.

  In the first temperature range (a temperature range lower than the first temperature and higher than the fourth temperature), the heating amount is set to be 0 (not combusted). In the second temperature range (region below the fourth temperature), the heating amount is set to increase stepwise in the order of the first heating amount, the second heating amount, and the third heating amount. .

  The heating amount / circulation flow rate acquisition unit 98 acquires the circulation flow rate and the heating amount from the heating amount / circulation flow rate table memory 99. The heating amount / circulation flow rate acquisition unit 98 to which the circulation flow rate and the heating amount are input outputs the information to the freeze prevention operation control unit.

  When the signal from the heating amount / circulation flow rate acquisition unit 98 is input, the freeze prevention operation control unit 97 executes the freeze prevention operation. When the information on the heating amount and the circulation flow rate is input from the heating amount / circulation flow rate acquisition unit 98, the freeze prevention operation control unit 97 inputs a signal indicating that the freeze prevention operation is performed to the heat source device control unit 93, and the heating amount. Output information. Further, the freeze prevention operation control unit 97 outputs a signal indicating that the freeze prevention operation is performed and information on the circulation flow rate to the pump control unit 92. Further, the freeze prevention operation control unit 97 outputs information to the effect that the freeze prevention operation is performed to the valve control unit 91.

  When the information on the heating amount is input from the freeze prevention operation control unit 97, the heat source device control unit 93 controls the first heat source unit 11 of the heat source device 1. When the information indicating that the heating amount is 0 is input from the freeze prevention operation control unit 97, the heat source device control unit 93 outputs a signal to stop the combustion to the ON / OFF control unit 941. Further, the heat source device control unit 93 receives a signal indicating that the ON / OFF control unit 941 starts combustion when information indicating that the heating is to be performed with the first heating amount is input from the freeze prevention operation control unit 97, for example. Is output to the heating amount control unit 942 and a signal indicating that the operation should be performed with the first heating amount is output. Thereby, the first heat source control unit 94 controls the driving of the first heat source unit 11.

  When the information indicating that the freeze prevention operation is executed and the information on the circulation flow rate are input from the freeze prevention operation control unit 97, the pump control unit 92 controls the circulation pump 36 to have the circulation flow rate.

  When the signal indicating that the freeze prevention operation is executed is input from the freeze prevention operation control unit 97, the valve control unit 91 controls the valve of the heating terminal 2 to be opened.

  The heat supply system having such a configuration operates as follows when the freeze prevention operation is executed.

  When the temperature detection unit 111 detects the temperature of the outside air, the temperature detection unit 111 outputs the detected temperature value to the comparison unit 96. The comparison unit 96 compares the input temperature value with the threshold temperature input from the threshold memory 961, and determines the temperature section to which the temperature value belongs. The comparison unit 96 outputs the temperature section information to the heating amount / circulation flow rate acquisition unit 98. The heating amount / circulation flow rate acquisition unit 98 acquires the heating amount and circulation flow rate assigned to the temperature section from the heating amount / circulation flow rate table memory 99. The heating amount / circulation flow rate acquisition unit 98 outputs the acquired information to the freeze prevention operation control unit 97.

  When the information on the heating amount and the circulation flow rate is input from the heating amount / circulation flow rate acquisition unit 98, the freeze prevention operation control unit 97 determines that the freeze prevention operation should be performed, and the heat source device control unit 93 The information indicating that the freeze prevention operation is performed and the heating amount information are output. Further, the freeze prevention operation control unit 97 outputs information indicating that the freeze prevention operation is performed and the circulation flow rate information to the pump control unit 92. Further, the freeze prevention operation control unit 97 outputs a signal indicating that the freeze prevention operation is performed to the valve control unit 91.

  When the information indicating that the freeze prevention operation and the heating amount information are input, the heat source device control unit 93 controls the first heat source unit 11 to the first heat source control unit based on the heating amount information. A power signal is output.

  When the information indicating that the freeze prevention operation is performed and the circulation flow rate information are input, the pump control unit 92 drives and controls the circulation pump 36 based on the circulation flow rate information. Moreover, the valve control part 91 will control to open the valve of the terminal 2 for heating, if the information to the effect of performing freeze prevention driving | operation is input.

  As a result, the freeze prevention operation is executed.

  Next, based on a flowchart, operation | movement of the heat supply system of this embodiment is demonstrated.

  The temperature detector 111 detects the temperature of the outside air and acquires a temperature value (S1). Next, the control device 9 determines which temperature section of the temperature section in which the detected temperature value is stored in the threshold memory or whether there is no corresponding temperature section (S2). If there is no temperature section corresponding to the detected temperature value, the process returns to step 1 again.

  When there is a temperature section corresponding to the detected temperature value, the control device acquires a heating amount and a circulation flow rate assigned to the temperature section to which the temperature value belongs from a preset heating amount / circulation flow rate table ( S3). Next, the control device 9 drives the circulation pump 36 at the circulation flow rate. In addition, the control device 9 operates the first heat source unit 11 of the heat source device 1 so as to have the heating amount (note that when the acquired heating amount is 0, the heat source device 1 is not operated). Moreover, the control apparatus 9 opens the valve provided in the inflow port 21 of the heating medium of each terminal 2 for heating (S4). Specifically, when the detected temperature belongs to the first temperature range, the heat medium is circulated by the circulation pump 36 without heating the heat medium by the heat source device 1. When the detected temperature belongs to the second temperature range, the heat medium is heated by the heat source device 1 and the heat medium is circulated by the circulation pump 36.

  Next, the temperature detection unit 111 detects the temperature again and acquires the temperature value. The control device 9 determines whether or not this temperature value is higher than a predetermined temperature higher than the first temperature (hereinafter referred to as OFF temperature) (S5). When the detected temperature value is larger than the OFF temperature, the control device 9 stops the first heat source unit 11 of the heat source device 1 and stops the circulation pump 36. The control device 9 closes the valve of the heating terminal 2. And it returns to step 1 again.

When the detected temperature value is equal to or lower than the OFF temperature, the control device 9 determines whether or not the temperature value belongs to another temperature section (S7). If the detected temperature value belongs to the same section as the current temperature section, the process returns to step 5 again. It should be noted that in this case, the temperature value detected during the freeze prevention operation is greater than and the first temperature below OFF temperature, the same control as the period T ₁ is performed.

  When the detected temperature value belongs to a section different from the current temperature section, the control device 9 determines the temperature section to which the temperature value belongs. And the control apparatus 9 acquires the heating amount and the circulation flow rate which were allocated to the temperature area corresponding to this temperature value (S8). The control device 9 switches the circulation pump 36 to the circulation flow rate. Furthermore, the control device 9 operates the first heat source unit 11 of the heat source device 1 so as to have the heating amount (in addition, when the acquired heating amount is 0, the heat source device 1 is not operated). And it returns to step 5 again.

As described above, the heat supply system of the present embodiment includes the heat source device 1, the heating terminal 2, the heat medium circulation path 3, and the circulation pump 36. Further, the heat supply system of the present embodiment includes a temperature detection unit 111 and a control device 9. The control device 9 controls the circulation source 36 and the heat source device 1. The control device 9 is configured to perform a freeze prevention operation. Freezing prevention operation, when the temperature detection unit 111 detects the temperature of the first temperature range,
The heating medium is circulated by the circulation pump 36 without heating the heating medium by the heat source device 1. In the freeze prevention operation, when the temperature detection unit 111 detects the temperature in the second temperature range lower than the first temperature range, the heat source device 1 is used to heat the heat medium and the circulation pump 36 is used to heat the heat medium. Circulate.

  When the temperature value detected by the temperature detector 111 belongs to the first temperature range that is higher than the second temperature range, the heat supply system of the present embodiment does not drive the heat source device 1. Freezing prevention operation is performed simply by circulating the heat medium. For this reason, according to the heat supply system of this embodiment, the heating amount of the heat source device 1 in the freeze prevention operation can be reduced, and energy saving can be achieved.

  Moreover, the heat supply system according to the present embodiment only circulates the heat medium if the temperature value detected by the temperature detection unit 111 belongs to the second temperature range when the environment becomes colder. Heating is also performed. For this reason, according to the heat supply system of the present embodiment, the freeze prevention operation can be effectively executed. As a result, the freeze prevention operation according to the temperature such as the outside air temperature can be executed.

  Moreover, the heat source device 1 of the heat supply system of the present embodiment can be switched at least between the first heating amount and the second heating amount that is larger than the first heating amount. In the freeze prevention operation, as shown in FIG. 3, when the temperature detection unit 111 detects the fifth temperature or less, the heating amount of the heat source device 1 is switched from the first heating amount to the second heating amount. In other words, the freeze prevention operation is one in which the heat source device 1 is switched from the first heating amount to the second heating amount when the temperature detection unit 111 detects a predetermined temperature or lower in the second temperature range.

  For this reason, even when the temperature value belongs to the second temperature range, the heat supply system of the present embodiment can heat and circulate the heat medium with a heating amount corresponding to the temperature. Thereby, according to the heat supply system of this embodiment, the heating amount in the freeze prevention operation can be further reduced.

  In addition, the circulation pump 36 of the heat supply system of the present embodiment is configured to be able to switch between at least a first circulation flow rate and a second circulation flow rate that is larger than the first circulation flow rate. In the freeze prevention operation of this embodiment, as shown in FIG. 3, when the second temperature or lower is detected, the circulation pump 36 is switched from the first circulation flow rate to the second circulation flow rate. In other words, the freeze prevention operation is one in which the circulation pump is switched from the first circulation flow rate to the second circulation flow rate when the temperature detection unit 111 detects a predetermined temperature or less in the first temperature range.

  For this reason, the heat supply system of the present embodiment can change the circulation flow rate of the circulation pump 36 according to the temperature value. Thereby, according to the heat supply system of this embodiment, the electric power of the circulation pump 36 in freezing prevention driving | operation can be reduced.

  Note that the circulation pump 36 of the present embodiment is configured to switch from the fourth circulation flow rate to the fifth circulation flow rate when detecting the fifth temperature or less in the second temperature range. That is, in the freeze prevention operation in the present invention, the circulation pump 36 may be switched from the first circulation flow rate to the second circulation flow rate when a predetermined temperature or lower is detected in the second temperature range.

  In the present embodiment, the combination of the heating amount and the circulation flow rate assigned to the temperature section is as shown in FIG. 3, but the present invention is not limited to the combination of FIG. For example, the circulation flow rate may be switched only in the second temperature range without switching the circulation flow rate in the first temperature range. Further, in the second temperature range, as the heat source device 1 performs heating, the circulation flow rate in the circulation pump 36 is set to circulate at a circulation flow rate smaller than the circulation flow rate in the first temperature range. May be.

  Thus, in the present invention, the combination of the heating amount and the circulation flow rate assigned to the temperature section in the freeze prevention operation can be freely changed according to the site.

  In addition, although the heat source device 1 of the heat supply system of the present embodiment has the latent heat exchanger 14, in the heat supply system of the present invention, the heat source device may not have the latent heat exchanger. Good.

DESCRIPTION OF SYMBOLS 1 Heat source apparatus 11 1st heat source part 12 Gas burner 13 Sensible heat exchanger 14 Latent heat exchanger 15 2nd heat source part 17 Sensible heat exchanger 18 Latent heat exchanger 2 Heating terminal 3 Heating medium circulation path 36 Circulation Pump 4 Heating tank 5 Reheating circuit 6 Reheating circulation path 63 Bath water pump 64 Bathtub 8 Hot water supply flow path 82 Water supply path 83 Hot water supply path 9 Controller 111 Temperature detector

Claims (3)

A heat source device;
A heating terminal that operates by obtaining heat from the heat source device;
A heating medium circulation path through which a heating medium flows by connecting the heat source device and the heating terminal;
A heat supply system provided with a circulation pump provided in the heat medium circulation path for circulating the heat medium,
A temperature detector for detecting the temperature of the outside air or the heat medium;
A control device capable of controlling the circulation pump and controlling the heat source device to perform the freeze prevention operation,
The freeze prevention operation is
When the temperature detection unit detects the temperature in the first temperature range, the heating medium is circulated by the circulation pump without heating the heating medium by the heat source device,
When the temperature detection unit detects a temperature in a second temperature range lower than the first temperature range, the heat medium is heated by the heat source device and the heat pump is circulated by the circulation pump. A heat supply system characterized by that. The heat source device is capable of switching between at least a first heating amount and a second heating amount that is larger than the first heating amount,
In the freeze prevention operation, the heat source device is switched from the first heating amount to the second heating amount when the temperature detecting unit detects a predetermined temperature or lower in the second temperature range. The heat supply system according to claim 1. The circulation pump is capable of switching between at least a first circulation flow rate and a second circulation flow rate larger than the first circulation flow rate,
In the freeze prevention operation, when the temperature detecting unit detects a predetermined temperature or lower in the first temperature range or the second temperature range, the circulation pump changes from the first circulation flow rate to the second circulation flow rate. The heat supply system according to claim 1, wherein the heat supply system is switched.

Images