JP2017062068A - Heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating apparatus capable of reducing burdens on a worker in water filling during test operation.SOLUTION: A heating apparatus includes a heat pump, a tank, a heater, a heat pump path, a heating path, a first circulation pump, a bypass path, a flow rate adjustment mechanism, a restraining mechanism, a water supply mechanism, and a controller. During test operation, the controller carries out first specific operation (S4, S6) for supplying water by the water supply mechanism and filling water in the heating path and the tank, and second specific operation (S8-S14) for supplying water by the water supply mechanism and filling water in the bypass path and the heat pump path.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heating device.

  In Patent Document 1, water is heated between a heat pump that heats water using heat absorbed from the atmosphere, a tank that stores water, a heater that uses heat released from water, and a tank and heat pump. A heat pump path that is a path for circulation, a heating path that is a path for circulating water between the tank and the heater, and a first that is provided in the heating path and circulates water in the heating path. A heating device including a circulation pump is disclosed.

JP2013-142492A

  In this type of heating device, after the heating device is installed at a predetermined location, a test operation such as a water filling operation of the heating device is performed. In the water filling operation of the heating apparatus, water filling of the heat pump path and water filling of the heating path are executed. The water filling operation of the heating device is executed based on the operation of the operator. In the water filling operation of the heating apparatus described in Patent Document 1, the water filling of the heat pump path and the water filling of the heating path are configured to be executed separately. In this case, the worker needs to execute each of an operation for performing water filling of the heat pump path and an operation for executing water filling of the heating path. For example, when water filling of the heat pump path is performed after water filling of the heating path, first, the operator performs an operation for causing water filling of the heating path. Next, when water filling of the heating path is completed, the operator performs an operation for causing water heating of the heat pump path. For this reason, in the water filling operation of the heating device, the worker needs to perform at least two operations, and thus the burden on the worker is large.

  In this specification, the heating apparatus which reduces the burden of the operator in the water filling of trial run is proposed.

  The heating device disclosed in this specification includes a heat pump, a tank, a heater, a heat pump path, a heating path, a first circulation pump, a bypass path, a flow rate adjustment mechanism, a suppression mechanism, and a water supply mechanism. And a control device. The heat pump heats water using the endotherm from the atmosphere. The tank stores water. The heater uses the heat radiation from the water to heat it. The heat pump path is a path for circulating water between the tank and the heat pump. The heating path is a path for circulating water between the tank and the heater. The first circulation pump is provided in the heating path and circulates water in the heating path. The bypass path connects the upstream side of the heater in the heating path and the upstream side of the heat pump in the heat pump path. The flow rate adjusting mechanism is provided in the bypass path, and changes the ratio of the flow rate of water passing through the heater and the flow rate of water passing through the bypass path by adjusting the opening degree. The suppression mechanism prevents water introduced from the bypass path into the heat pump path from flowing back into the tank through the heat pump path. The water supply mechanism supplies water to the heating path. The control device performs a test run. The control device supplies water by the water supply mechanism during the trial operation, operates the first circulation pump, and adjusts the opening of the flow rate adjustment mechanism so that the water circulating in the heating path does not pass through the bypass path, A first specific operation for performing water filling of the heating path and the tank, and supplying water by a water supply mechanism to operate the first circulation pump, and at least a part of the water circulating in the heating path passes through the bypass path Then, the opening degree of the flow rate adjusting mechanism is adjusted, and the second specific operation for executing water filling of the bypass path and the heat pump path is executed. The “water” here may be any water that can be used for heat dissipation in the heater, and may be tap water or a so-called antifreeze containing ethylene glycol.

  According to said structure, by performing trial operation, a control apparatus performs the 1st specific operation which performs water filling of a heating path and a tank, and the 2nd specific operation which performs water filling of a bypass path and a heat pump path | route. For this reason, the operator does not need to separately perform an operation for executing the first specific operation and an operation for executing the second specific operation. As a result, it is possible to reduce the burden on the operator in the water filling for trial operation.

The figure which shows the structure of the heating system 2 typically. The flowchart explaining the water filling operation which the heating system 2 performs. The figure which shows the state of a heating circulation pump, a 1st thermal valve, a 2nd thermal valve, a distribution valve, and an HP water supply pump in water filling operation.

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

(Characteristic 1) The control device executes the second specific operation when it is determined that the first specific operation is completed.

  If water filling to the bypass path and the heat pump path is performed in a state where water filling to the tank has not been completed, air remaining in the tank flows into the heat pump path, making it difficult to vent air from the heat pump path. According to the above configuration, when the second specific operation is started, the filling of the tank is completed, and no air remains in the tank. For this reason, in the 2nd specific driving | operation, the air vent from a heat pump path | route can be performed reliably.

(Feature 2) The heating device may be further provided with a second circulation pump that is provided in the heat pump path and circulates water in the heat pump path. The control device may operate the second circulation pump in the second specific operation.

  According to said structure, the water which flowed into the heat pump path | route via the bypass path by the drive of the 1st circulation pump can be circulated in the heat pump path | route by the drive of a 2nd circulation pump. For this reason, water filling to the heat pump path can be performed reliably.

(Example)
As shown in FIG. 1, the heating system 2 according to this embodiment includes an HP (heat pump) unit 10, a tank unit 20, a heating unit 40, and a control device 70.

  The HP unit 10 includes a heat pump 12, an HP circulation pump 14, an HP forward pipe 16, an HP return pipe 18, a tank upper pipe 80, and an air vent pipe 82. In the heating system 2 of the present embodiment, the heat pump 12, the HP circulation pump 14, a part of the HP forward pipe 16, and a part of the HP return pipe 18 of the HP unit 10 are installed outdoors. It is assumed that

  The heat pump 12 includes a heat exchanger (not shown) that exchanges heat between water supplied from the HP forward pipe 16 and the refrigerant. In the present embodiment, tap water is used in the heating system 2 as a heating medium for heating. In another example, an antifreeze containing ethylene glycol or the like may be used as a heating medium for heating. The heat exchanger includes a heat medium pipe through which water flows and a refrigerant pipe through which refrigerant flows (not shown). Both ends of the heat transfer medium pipe are connected to the HP forward pipe 16 and the HP return pipe 18, respectively. A gas such as carbon dioxide or HFC (hydrofluorocarbon) can be used as the refrigerant flowing in the refrigerant pipe. In the present embodiment, the water flowing through the HP forward pipe 16 exchanges heat with the refrigerant (high temperature and high pressure) in the refrigerant pipe (receives heat from the refrigerant) while passing through the heat medium pipe of the heat exchanger. Heated. The high-temperature water after the heat exchange is sent out to the HP return pipe 18. It is preferable that the water in the heat medium pipe and the refrigerant in the refrigerant pipe flow in opposite directions (counter flow) from the viewpoint of efficient heat exchange. Further, the heat pump 12 includes a temperature sensor 15. The temperature sensor 15 measures the outside air temperature.

  One end of the HP forward pipe 16 is connected to the lower part of the tank 22 (described later), and the other end is connected to the inlet side of the heat medium pipe of the heat pump 12. The HP forward pipe 16 sends the water in the lower part of the tank 22 to the heat medium pipe of the heat pump 12. The HP forward pipe 16 includes a temperature sensor 39 that measures the temperature of water flowing through the HP forward pipe 16. Further, in the HP outgoing pipe 16, water flowing into the HP outgoing pipe 16 from the first bypass path 90 flows into the tank 22 on the upstream side of the connection portion with the first bypass path 90 (described later). A check valve 30 to be suppressed is interposed. The check valve 30 is a mechanical valve that does not require power supply.

  One end of the HP return pipe 18 is connected to the outlet side of the heat medium pipe of the heat pump 12, and the other end is connected to one end of the tank upper pipe 80, one end of the heating forward pipe 42, and one end of the air vent pipe 82. Further, the HP return pipe 18 includes a temperature sensor 38 that measures the temperature of water flowing through the HP return pipe 18. The other end of the tank upper pipe 80 is connected to the upper part of the tank 22. The other end of the air vent pipe 82 is open to the atmosphere. The air vent pipe 82 is provided with an air vent valve 84. By opening the air vent valve 84, the air in the HP unit 10 is exhausted to the outside.

  In the example of FIG. 1, the HP circulation pump 14 is provided in the heat pump 12. By driving the HP circulation pump 14, water circulates between the heat pump 12 and the tank 22 through the HP forward pipe 16, the HP return pipe 18, and the tank upper pipe 80.

  The tank unit 20 includes a tank 22 and three temperature sensors 24, 26, and 28. The tank 22 stores the water heated by the heat pump 12. The capacity of the tank 22 is, for example, 30L. The three temperature sensors 24, 26, and 28 are provided in this order from the bottom along the height direction of the tank 22. Each temperature sensor 24, 26, 28 measures the temperature of water in the tank 22.

  The heating unit 40 includes a heating forward pipe 42, a heating return pipe 44, a heating circulation pump 46, a burner 48, a heater 50, a second bypass passage 60, a distribution valve 62, an expansion tank 100, a pressure An adjustment pipe 102 and an expansion tank upper pipe 104 are provided.

  One end of the heating forward pipe 42 is connected to the end of the tank upper pipe 80, the end of the HP return pipe 18, and the end of the air vent pipe 82, and the other end is connected to the heater 50. The heating forward pipe 42 sends water sent from the upper part of the tank 22 to the heater 50. The heating forward pipe 42 includes a heating circulation pump 46 that causes the water in the heating forward pipe 42 to flow, and temperature sensors 52, 54, and 56 that measure the temperature of the water flowing in the heating forward pipe 42. Further, the heating forward pipe 42 includes a water level electrode 45 that measures the level of water flowing in the heating forward pipe 42 between the temperature sensor 56 and the heating circulation pump 46. The water level electrode 45 is turned on when the level of water flowing in the heating forward pipe 42 reaches a predetermined level, and is turned off if the level of water flowing in the heating forward pipe 42 does not reach the predetermined level. The water level electrode 45 of the present embodiment is set to be turned on when the heating forward pipe 42 is filled with water.

  One end of the first bypass 90 is connected to the upstream side of the heater 50 of the heating forward pipe 42, and the other end is connected to the downstream side of the check valve 30 and the temperature sensor 39 of the HP forward pipe 16. By providing the first bypass path 90, part or all of the water flowing through the heating forward pipe 42 can flow through the HP forward pipe 16 without passing through the heater 50 and the tank 22.

  Further, a first thermal valve 91 for opening and closing the heating forward pipe 42 is provided on the downstream side of the connection portion with the first bypass path 90 in the heating forward pipe 42. The first bypass passage 90 is provided with a second thermal valve 92 for opening and closing the first bypass passage 90. By opening the first thermal valve 91, water can be supplied from the heating forward pipe 42 to the heater 50. By opening the second thermal valve 92, water can be supplied from the heating forward pipe 42 to the first bypass passage 90. By adjusting the opening degree of the first thermal valve 91 and the opening degree of the second thermal valve 92, the ratio of the flow rate of water passing through the heater 50 and the flow rate of water passing through the first bypass passage 90 is determined. It can also be changed. In the present embodiment, when the first thermal valve 91 is closed and the second thermal valve 92 is opened, the entire amount of water flowing through the heating forward pipe 42 passes through the first bypass 90. Conversely, when the first thermal valve 91 is opened and the second thermal valve 92 is closed, the entire amount of water flowing through the heating forward pipe 42 is supplied to the heater 50.

  The heater 50 performs heating using heat radiation from the water supplied from the heating forward pipe 42. Due to heat dissipation, the temperature of water decreases. The water after heat dissipation is sent out to the heating return pipe 44.

  The burner 48 burns fuel such as city gas or LP gas, and heats the water flowing in the heating forward pipe 42 by the combustion heat. The burner 48 is an auxiliary heat source that operates when the water in the heating forward pipe 42 does not reach the temperature required by the heater 50.

  The heating return pipe 44 has one end connected to the heater 50 and the other end connected to the lower portion of the tank 22. The heating return pipe 44 sends the water after heat dissipation sent from the heater 50 to the tank 22. The heating return pipe 44 further includes a temperature sensor 58 that measures the temperature of water (after heat radiation) flowing through the heating return pipe 44.

  One end of the pressure adjustment pipe 102 is connected to the heating forward pipe 42 on the downstream side of the burner 48 and on the upstream side of the connection portion with the first bypass path 90. The other end of the pressure adjusting tube 102 is open to the atmosphere. One end of an expansion tank upper pipe 104 is connected to the pressure adjusting pipe 102. The other end of the expansion tank upper pipe 104 is connected to the expansion tank 100. In the present embodiment, the path through which water circulates is a sealed path. For this reason, the expansion tank 100 is prepared to absorb the expansion and contraction of water. The pressure adjusting pipe 102 is provided with a pressure relief valve 106. The pressure relief valve 106 is provided closer to the open end (end opened to the atmosphere) than the connection between the pressure adjusting pipe 102 and the expansion tank upper pipe 104. The pressure relief valve 106 is automatically opened so that the water pressure in the heating system 2 does not exceed a predetermined pressure by opening when the water pressure in the heating system 2 exceeds a predetermined pressure.

  The second bypass path 60 connects the heating forward pipe 42 and the heating return pipe 44. The second bypass path 60 has one end connected to the upstream side of the heating circulation pump 46 of the heating forward pipe 42 and the other end connected to the heating return pipe 44. By providing the second bypass 60, part or all of the water flowing through the heating return pipe 44 can be returned to the heating forward pipe 42 without going through the tank 22.

  A distribution valve 62 is provided at a portion where the heating return pipe 44 and the second bypass path 60 are connected. By adjusting the opening degree of the distribution valve 62, the ratio of the flow rate of water returned from the heating return pipe 44 to the tank 22 and the flow rate of water flowing from the heating return pipe 44 to the second bypass path 60 can be changed. . In this embodiment, when the distribution valve 62 is fully closed, the entire amount of water flowing through the heating return pipe 44 passes through the second bypass path 60. When the distribution valve 62 is fully opened, the entire amount of water flowing through the heating return pipe 44 is supplied to the tank 22.

  By adjusting the opening of the distribution valve 62, for example, when the temperature of the water sent to the heater 50 through the heating forward pipe 42 is too high, the water after heat dissipation in the heating return pipe 44 is changed to the second temperature. The temperature of the water sent to the heater 50 can be lowered by joining the water in the heating forward pipe 42 through the bypass 60. Further, for example, when the heating operation is performed in a state in which the high-temperature water is not sufficiently stored in the tank 22, the second bypass 60 is used without returning the water after heat dissipation in the heating return pipe 44 to the tank 22. The temperature of the water in the tank 22 can be suppressed from decreasing by joining the water in the heating forward pipe 42 via the.

  The heating return pipe 44 is connected to a pressurizing system 200 including a water storage tank 202 and a water supply pump 204 in a trial operation to be described later. The pressurized cistern 200 is connected to the heating return pipe 44 via a cistern forward pipe 206 and a cistern return pipe 208. The cistern forward pipe 206 is connected to the heating return pipe 44 via the on-off valve 212, and the cistern return pipe 208 is connected to the heating return pipe 44 via the on-off valve 214. The water supply pump 204 is provided between the water storage tank 202 and the on-off valve 212. The water storage tank 202 stores water supplied to the heating system 2. An opening / closing valve 216 is provided between the connection portion of the heating return pipe 44 and the cistern return pipe 206 and the connection portion of the heating return pipe 44 and the cistern return pipe 208. By operating the water supply pump 204 in a state where the on-off valve 212 is open and the on-off valve 216 is closed, the water in the water storage tank 202 is supplied to the heating return pipe 44 through the cistern forward pipe 206. .

  The control device 70 is electrically connected to the HP unit 10, the tank unit 20, and the heating unit 40, and controls the operation of each component of each unit 10, 20, 40. The control device 70 causes the heating system 2 of the present embodiment to perform a test operation (water filling operation or the like) and a use operation (heat storage operation, heating operation, freeze prevention operation, or the like).

  Both the normal power system 72 and the snow melting power system 74 are provided by an electric power company. The normal power system 72 is a power system that can always be used. On the other hand, the snow melting power system 74 is a special power system that can be used mainly in the winter (October to May) in cold regions. Note that the electric power company stops supplying power to the snow melting power system 74 during a period when the snow melting power system 74 cannot be used (June to September). There is a rule that the use of power from the snow melting power system 74 is limited to heating purposes. Furthermore, in a period in which the snow melting power system 74 can be used, there is also a rule that it is necessary to provide a cut-off period for cutting off power during a predetermined time period (for example, from 16:00 to 21:00 every day). Yes. The blocking period needs to be provided for a total of 2 hours every day during a predetermined time period (for example, every day from 16:00 to 21:00). The blocking period is set in advance by the user. Therefore, the user can set, for example, 2 hours from 16:00 to 18:00 every day as the cutoff period. Moreover, in another example, you may provide the interruption | blocking period of 30 minutes intermittently 4 times between 16: 00-21: 00 every day. If a total of 2 hours of blocking period can be provided between 16:00 and 21:00 every day, the setting method of the blocking period can be arbitrary.

  As shown in FIG. 1, the snow melting power system 74 includes a timer 76. The timer 76 operates during a period during which the snow melting power system 74 can be used (October to May in the above example). If the timer 76 indicates that the snow melting power system 74 is available, the power supply is interrupted by a breaker (not shown), and the snow melting power system 74 is temporarily unavailable. Become (blocked).

  In the present embodiment, the heat pump 12, the HP circulation pump 14, and the distribution valve 62 operate by receiving power supply from the snow melting power system 74. Therefore, when the cutoff period of the snow melting power system 74 starts, the heat pump 12, the HP circulation pump 14, and the distribution valve 62 cannot operate. The control device 70, the heating circulation pump 46, the burner 48, the heater 50, the first thermal valve 91, the second thermal valve 92, and the water supply pump 204, which are other elements, supply power from the normal power system 72. Receive and operate. Therefore, the control device 70, the heating circulation pump 46, the burner 48, the heater 50, the first thermal valve 91, the second thermal valve 92, and the feed water pump 204 are always operable.

  Next, the operation of the heating system 2 of the present embodiment will be described. The heating system 2 performs different use operations in the usable period of the snow melting power system 74 and the cutoff period of the snow melting power system 74. In the heating system 2, the use operation is performed after the test operation. Here, the use operation will be described first.

(Use operation during available period of snowmelt power system 74)
During the period in which the snow melting power system 74 can be used, the control device 70 of the heating system 2 can execute the freeze prevention operation, the heat storage operation, and the heating operation. Moreover, the control apparatus 70 of the heating system 2 performs the process immediately before interruption described later when the interruption period of the snow melting power system 74 starts 5 minutes before.

  The anti-freezing operation during the usable period of the snow melting power system 74 is to prevent freeze damage of the heat pump 12, the HP forward pipe 16, and the HP return pipe 18 by circulating water between the heat pump 12 and the tank 22. Driving. When the freeze prevention operation is instructed during the usable period of the snow melting power system 74, the control device 70 operates the HP circulation pump 14. By operating the HP circulation pump 14, water circulates between the heat pump 12 and the tank 22 through the HP forward pipe 16, the HP return pipe 18, and the tank upper pipe 80. When relatively high-temperature water is stored in the tank 22, relatively high-temperature water is supplied to the heat pump 12, the HP forward pipe 16, and the HP return pipe 18, and thus the heat pump 12 and the HP forward pipe 16. And freezing breakage of the HP return pipe 18 is appropriately suppressed.

  When high temperature water is not stored in the tank 22 when the freeze prevention operation is instructed, the control device 70 operates the heat pump 12 together with the HP circulation pump 14. That is, the control device 70 performs a heat storage operation. The heat storage operation is an operation in which water in the tank 22 is heated by heat generated by the heat pump 12. Thus, the water supplied from the HP forward pipe 16 to the heat pump 12 is heated by the heat generated by the heat pump 12 and returned to the upper part of the tank 22 through the HP return pipe 18 and the tank upper pipe 80. Thereby, hot water is stored in the tank 22. A high temperature water layer is formed in the upper part of the tank 22, and a low temperature water layer is formed in the lower part.

  When this heat storage operation is performed, relatively high-temperature water is stored in the tank 22, and as a result, relatively high-temperature water is supplied to the heat pump 12, the HP forward pipe 16, and the HP return pipe 18. It becomes like this. Therefore, the freezing breakage of the heat pump 12, the HP forward pipe 16, and the HP return pipe 18 is appropriately suppressed. In the present embodiment, even when the freeze prevention operation is not instructed, the control device 70 may perform the heat storage operation alone.

  In addition, when the freeze prevention operation is instructed, an operation different from the above freeze prevention operation is performed while the heating operation is being performed. The heating operation is an operation in which the room 50 is heated by operating the heater 50. When the heating operation is executed during the period when the snow melting power system 74 is available, the control device 70 operates the heat pump 12 and the HP circulation pump 14 together with the heating circulation pump 46. At this time, the control device 70 opens the first thermal valve 91 and closes the second thermal valve 92. Thereby, water circulates in the order of the tank 22, the heating forward pipe 42, the heater 50, the heating return pipe 44, and the tank 22. The heater 50 heats the living room using the heat of water. During the heating operation, the control device 70 operates the heat pump 12 so that the temperature of the water supplied to the heater 50 (that is, the temperature detected by the temperature sensor 56) is maintained at a predetermined set temperature. . In addition, when the temperature of the water supplied to the heater 50 is not sufficient, the control device 70 can open the distribution valve 62 and increase the ratio of the flow rate of the water supplied to the tank 22. In addition, when the temperature of the water supplied to the heater 50 is too high, the control device 70 reduces the opening of the distribution valve 62 and sets the second bypass 60 in the water flowing through the heating return pipe 44. It is also possible to increase the rate of water flow through. In addition, the control apparatus 70 can operate the burner 48, when the temperature of the water supplied to the heater 50 is not enough.

  Even when this heating operation is performed, water can be sufficiently circulated in the heat pump 12, the HP forward pipe 16, and the HP return pipe 18. Therefore, it is possible to appropriately suppress freezing and breakage of the heat pump 12, the HP forward pipe 16, and the HP return pipe 18. In the present embodiment, even when the freeze prevention operation is not instructed, the control device 70 may perform the heating operation alone.

  The process immediately before the shutoff is a process in which the distribution valve 62 is operated before the snow melting power system 74 is shut off for the heating operation and the freeze prevention operation after the snow melting power system 74 is shut off. Specifically, the control device 70 constantly monitors that the cutoff period of the snow melting power system 74 is five minutes before the start of the cutoff period, and when the cutoff period of the snow melting power system 74 is five minutes before, all the distribution valves 62 are turned on. Perform the closing process. As a result, the entire amount of water flowing through the heating return pipe 44 passes through the second bypass path 60. That is, water is not supplied to the tank 22.

(Usage operation during the interruption period of the snow melting power system 74)
After the above-described process immediately before the interruption, the interruption period of the snow melting power system 74 is started. As described above, the heat pump 12, the HP circulation pump 14, and the distribution valve 62 cannot be operated during the interruption period of the snow melting power system 74. Therefore, the heating system 2 can execute the heating operation and the freeze prevention process during the interruption period of the snow melting power system 74.

  When execution of the heating operation is instructed during the shut-off period, the control device 70 operates the heating circulation pump 46 and the burner 48. Further, the control device 70 opens the first thermal valve 91 and closes the second thermal valve 92. Further, the distribution valve 62 is fully closed in the operation immediately before the shut-off described above. In the heating operation during the shut-off period, the heat pump 12 and the HP circulation pump 14 are not operated. Thus, the water circulates in the order of the heating forward pipe 42, the heater 50, the heating return pipe 44, and the second bypass path 60. Water after being heated by the combustion heat of the burner 48 is supplied to the heater 50. The heater 50 heats the living room using the heat of water.

  The freeze prevention process is a process for causing the freeze prevention operation to be executed during the shut-off period of the snow melting power system 74. The control device 70 starts the anti-freezing process when the cutoff period of the snow melting power system 74 is started. The freeze prevention process is a process for preventing the heat pump 12, the HP outgoing pipe 16, and the HP return pipe 18 from being frozen and damaged. The control device 70 executes the freeze prevention process when the outside air temperature measured by the temperature sensor 15 provided in the heat pump 12 is equal to or lower than a predetermined temperature. Note that at the time when the anti-freezing process is started, the distribution valve 62 is fully closed by the process immediately before the shut-off.

  When the heating operation is not executed, the control device 70 operates the heating circulation pump 46 and the burner 48 intermittently according to the outside air temperature. That is, the control device 70 operates the heating circulation pump 46 and the burner 48 for a first predetermined time, and stops the heating circulation pump 46 and the burner 48 for a second predetermined time. During this time, the first thermal valve 91 is closed and the second thermal valve 92 is opened. As a result, while the heating circulation pump 46 and the burner 48 are in operation, the hot water heated by the burner 48 passes through the first bypass passage 90 and flows into the HP forward pipe 16. Since high-temperature water circulates in the HP forward pipe 16 and the HP return pipe 18, freezing damage to the heat pump 12, the HP forward pipe 16, and the HP return pipe 18 is suppressed. The first predetermined time and the second predetermined time are automatically adjusted according to the outside air temperature.

  On the other hand, when the heating operation is being performed, the control device 70 operates the heating circulation pump 46 and the burner 48 continuously. In this case, the first thermal valve 91 is continuously opened. The controller 70 opens the second thermal valve 92 for a third predetermined time and then closes it for a fourth predetermined time. While the second thermal valve 92 is open, the water heated by the burner 48 passes through the first bypass path 90 and flows into the HP forward pipe 16. Since hot water circulates in the heat pump 12, the HP forward pipe 16, and the HP return pipe 18, freezing damage to the heat pump 12, the HP forward pipe 16, and the HP return pipe 18 is suppressed. The third predetermined time and the fourth predetermined time are automatically adjusted according to the outside air temperature.

(Trial run)
The heating system 2 performs a trial operation before performing the use operation. The test run is executed during the use period of the snow melting power system 74.

  When installing the heating system 2 in a house, after installing the HP unit 10, the tank unit 20, and the heating unit 40 in an appropriate installation location according to the layout of the house, connect the piping between the units, Connect the power supply line to each unit. Then, when the preparatory work for the trial run by the operator is completed, the trial run is executed. The test operation includes water filling operation, heat pump test operation, heating test operation, and the like. About heat pump trial run, heating trial run, etc., it is performed by a publicly known method. For this reason, only water filling operation will be described below, and description of operations such as heat pump test operation and heating test operation will be omitted.

  The preparatory work for the trial run performed by the worker will be described. First, the worker connects the pressurizing system 200 to the heating system 2 and electrically connects the water supply pump 204 and the control device 70. As a result, the control device 70 controls the operation of the water supply pump 204. Next, the operator opens the on-off valve 212 and the on-off valve 214 and closes the on-off valve 216. Thereby, the water stored in the water storage tank 202 of the pressurization system 200 can be supplied to the heating system 2. Next, the operator who performs the trial operation opens the air vent valve 84. Next, the worker causes the control device 70 to perform a trial run via a remote controller (not shown) that can communicate with the control device 70.

(Water-filled operation)
In the trial operation, a water filling operation is first executed. In the water filling operation, the heating system 2 is filled with water using water supplied from the pressurization system 200 connected to the heating system 2. At the start of the water filling operation, the HP circulation pump 14, the heating circulation pump 46, and the water supply pump 204 are set to non-drive (OFF). Processing of the control device 70 executed during the water filling operation will be described with reference to FIGS. Hereinafter, the heating circulation pump 46, the first thermal valve 91, the second thermal valve 92, the distribution valve 62, and the HP circulation pump 14 are collectively referred to as an “operation unit”. Further, the HP forward pipe 16 and the HP return pipe 18 are collectively referred to as “heat pump path”, and the heating forward pipe 42 and the heating return pipe 44 are collectively referred to as “heating path”.

  When the trial run start switch is operated, the control device 70 drives the water supply pump 204 in step S2. As a result, the water in the water storage tank 202 is supplied to the heating return pipe 44 through the systern forward pipe 206 and the on-off valve 212.

  Next, in step S4, the control device 70 switches the operation unit to the first state (FIG. 3). Specifically, the control device 70 drives the heating circulation pump 46 (ON in FIG. 3), opens the first thermal valve 91, closes the second thermal valve 92, opens the distribution valve 62, and HP circulation. The pump 14 is not driven (OFF in FIG. 3). By opening the first thermal valve 91 and closing the second thermal valve 92, the entire amount of water flowing through the heating forward pipe 42 is supplied to the heater 50. That is, no water is supplied to the first bypass path 90. The opening degree of the distribution valve 62 is adjusted to an opening degree at which water is supplied to the tank 22 and the second bypass passage 60. As a result, water is supplied to the heating forward pipe 42, the heating return pipe 44, the second bypass path 60, the tank 22, and the tank upper pipe 80. Further, water is supplied from a lower part of the tank 22 to a part of the HP outgoing pipe 16. On the other hand, water is not supplied to the first bypass 90 and the HP return pipe 18. By supplying water to the heating forward pipe 42, the heating return pipe 44, and the second bypass path 60, the air contained in the heating forward pipe 42, the heating return pipe 44, and the second bypass path 60 passes through the on-off valve 214. And exhausted to the outside. Further, when water is supplied to the tank 22 and the tank upper pipe 80, the air contained in the tank 22 and the tank upper pipe 80 passes through the air vent valve 84 and is exhausted to the outside. The water filling operation performed in the first state of the operation unit is referred to as “first water filling operation”.

  Next, in step S6, the control device 70 determines whether or not the state where the water level of the heating forward pipe 42 has reached the predetermined water level is continued for a fifth predetermined time. The fifth predetermined time is, for example, 30 minutes. As described above, whether or not the water level of the heating forward pipe 42 has reached the predetermined water level can be determined using the water level electrode 45. That is, the control device 70 determines that the water level of the heating forward pipe 42 has reached the predetermined water level when the water level electrode 45 is ON.

  When the state in which the water level of the heating forward pipe 42 has reached the predetermined water level continues for the fifth predetermined time (YES in step S6), the control device 70 proceeds to step S8. On the other hand, when the state where the water level of the heating forward pipe 42 has reached the predetermined water level has not been continued for the fifth predetermined time (NO in step S6), the control device 70 returns to step S6. That is, the control device 70 continues the first water filling operation. In addition, when the state where the water level of the heating forward pipe 42 has reached the predetermined water level is continued for the fifth predetermined time (in the case of YES in step S6), the heating path (specifically, the heating forward pipe 42 and This is a case where the heating return pipe 44), the tank 22, and the tank upper pipe 80 are filled with water.

  Next, in step S8, the control device 70 switches the operation unit to the second state (FIG. 3). Specifically, the control device 70 drives the heating circulation pump 46 (ON in FIG. 3), closes the first thermal valve 91, opens the second thermal valve 92, opens the distribution valve 62, and HP circulation. The pump 14 is not driven (OFF in FIG. 3). By closing the first thermal valve 91 and opening the second thermal valve 92, the entire amount of water flowing through the heating forward pipe 42 is supplied to the first bypass 90. As a result, the entire amount of water flowing through the heating forward pipe 42 is supplied to the first bypass path 90. Since a part of the water filled in the heating forward pipe 42 flows into the first bypass path 90, the water level in the heating forward pipe 42 is lowered. For this reason, the water level electrode 45 is turned OFF. By supplying water to the first bypass path 90, the air contained in the first bypass path 90 is pushed out toward the heat pump path. Further, water is also supplied to the HP forward pipe 16 in the heat pump path, so that air in the heat pump path is pushed out toward the HP return pipe 18. The air pushed out toward the HP return pipe 18 is exhausted from the air vent valve 84 to the outside. The water filling operation performed in the second state by the operation unit is referred to as “second water filling operation”.

  Next, in step S10, the control device 70 determines whether or not the state where the water level of the heating forward pipe 42 has reached the predetermined water level is continued for a fifth predetermined time.

  If the state in which the water level of the heating forward pipe 42 has reached the predetermined water level is continued for the fifth predetermined time (YES in step S10), the control device 70 proceeds to step S12. On the other hand, when the state where the water level of the heating forward pipe 42 has reached the predetermined water level has not been continued for the fifth predetermined time (NO in step S10), the control device 70 returns to step S10. That is, the control device 70 continues the second water filling operation. When the state where the water level of the heating forward pipe 42 has reached the predetermined water level is continued for the fifth predetermined time (in the case of YES in step S10), the heating path, the tank 22, the tank upper pipe 80, and In addition to the second bypass path 60, the first bypass path 90 is filled with water.

  Next, in step S12, the control device 70 switches the operation unit to the third state. Specifically, the control device 70 drives the heating circulation pump 46 (ON in FIG. 3), closes the first thermal valve 91, opens the second thermal valve 92, opens the distribution valve 62, and HP circulation. The pump 14 is driven (ON in FIG. 3). By driving the HP circulation pump 14, water circulates through the heat pump path. Further, since the heating circulation pump 46 is driven, a part of the water stored in the heating forward pipe 42 flows into the heat pump path through the first bypass path 90. Thereby, the water level in the heating forward pipe 42 is lowered. For this reason, the water level electrode 45 is turned OFF. When the HP circulation pump 14 is driven in a state where water filling to the tank 22 is not completed, the air remaining in the tank 22 flows into the heat pump path (specifically, the HP return pipe 18), and the heat pump It is difficult to remove air from the route. In the present embodiment, the water filling to the tank 22 is completed in the first water filling operation, and no air remains in the tank 22. For this reason, by driving the HP circulation pump 14, the air included in the heat pump path passes through the air vent valve 84 and is exhausted to the outside. Further, the water that has flowed into the HP forward pipe 16 via the first bypass path 90 is circulated in the heat pump path by driving the HP circulation pump 14, so that the water filling to the heat pump path can be reliably performed. The water filling operation performed in the third state by the operation unit is referred to as “third water filling operation”.

  Next, in step S14, the control device 70 determines whether or not the state where the water level of the heating forward pipe 42 has reached the predetermined water level is continued for the fifth predetermined time.

  When the state in which the water level of the heating forward pipe 42 has reached the predetermined water level is continued for the fifth predetermined time (YES in step S14), the control device 70 proceeds to step S16. On the other hand, if the state where the water level of the heating forward pipe 42 has reached the predetermined water level has not been continued for the fifth predetermined time (NO in step S14), the control device 70 returns to step S14. That is, the control device 70 continues the third water filling operation. In addition, when the state where the water level of the heating forward pipe 42 has reached the predetermined water level is continued for the fifth predetermined time (in the case of YES in step S14), the heating path, the tank 22, the tank upper pipe 80, the first In addition to the 2 bypass path 60 and the first bypass path 90, the heat pump path (specifically, the HP forward pipe 16 and the HP return pipe 18) is filled with water. That is, the water filling to the heating system 2 is completed.

  Next, in step S16, the control device 70 switches the operating unit to the fourth state, and proceeds to step S18. Specifically, the control device 70 deactivates the heating circulation pump 46 (OFF in FIG. 3), closes the first thermal valve 91, closes the second thermal valve 92, opens the distribution valve 62, and opens the HP. The circulation pump 14 is not driven (OFF in FIG. 3). Next, in step S18, the control device 70 deactivates the water supply pump 204. Thus, the water filling operation of the heating system 2 is completed. When the water filling operation is completed, the control device 70 continues to execute the heat pump test operation, the heating test operation, and the like.

  As is clear from the above description, in the heating system 2 of the present embodiment, the control device 70 performs the first water filling operation, the second water filling operation, and the third water filling operation by performing the test operation. Run. For this reason, the operator does not need to separately perform an operation for executing the first water filling operation and an operation for executing the second water filling operation and the third water filling operation. As a result, compared with the case where the operation for executing the first water filling operation and the operation for executing the second water filling operation and the third water filling operation are performed separately, the worker in the water filling operation of the trial operation is performed. Can be reduced. Moreover, in the heating system 2 of a present Example, the water filling to the heat pump path | route is performed after the water filling to the tank 22 is completed. For this reason, in the second water filling operation and the third water filling operation, air can be surely removed from the heat pump path.

  In the present embodiment, the heating system 2 is an example of a “heating device”. The heating circulation pump 46 is an example of a “first circulation pump”. The first bypass path 90 is an example of a “bypass path”. The first thermal valve 91 and the second thermal valve 92 are examples of the “flow rate adjusting mechanism”. The check valve 30 is an example of a “suppression mechanism”. The pressurizing system 200 is an example of a “water supply mechanism”. The first water filling operation executed in S4 and S6 in FIG. 2 is an example of the “first specific operation”, and the second water filling operation executed in S8 and S10 in FIG. 2 and S12 and S14 in FIG. The third water filling operation executed in step 1 is an example of the “second specific operation”. The HP circulation pump 14 is an example of a “second circulation pump”.

  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.

  In the above embodiment, the pressurizing system 200 and the water supply pump 204 are connected to the heating system 2 during the trial operation. However, a heating turn-out pipe 42 may be connected to a systern that is open at the top and stores water. In this case, it is not necessary to connect the pressurizing systern 200 and the water supply pump 204 before performing the trial operation.

  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.

2: Heating system 10: HP unit 12: Heat pump 14: HP circulation pump 15: Temperature sensor 16: HP forward pipe 18: HP return pipe 20: Tank unit 22: Tanks 24, 26, 28: Temperature sensor 30: Check valve 38, 39: Temperature sensor 40: Heating unit 42: Heating return pipe 44: Heating return pipe 45: Water level electrode 46: Heating circulation pump 48: Burner 50: Heater 52, 54, 56, 58: Temperature sensor 60: Second Bypass path 62: Distribution valve 70: Control device 72: Normal power system 74: Snow melting power system 76: Timer 80: Tank upper pipe 82: Air vent pipe 84: Air vent valve 90: First bypass path 91: First thermal valve 92 : Second thermal valve 100: expansion tank 102: pressure adjusting pipe 104: expansion tank upper pipe 106: pressure relief valve 200: pressurization system 202: water storage tank Click 204: feed pump 206: cistern forward pipe 208: cistern return pipe 212: on-off valve 214: on-off valve 216: on-off valve

Claims (3)

A heat pump that heats water using heat absorbed from the atmosphere;
A tank for storing water,
A heater for heating using heat radiation from the water;
A heat pump path, which is a path for circulating water between the tank and the heat pump;
A heating path, which is a path for circulating water between the tank and the heater,
A first circulation pump that is provided in the heating path and circulates water in the heating path;
A bypass path connecting the upstream side of the heater in the heating path and the upstream side of the heat pump in the heat pump path;
A flow rate adjusting mechanism that is provided in the bypass path and changes the ratio of the flow rate of water passing through the heater and the flow rate of water passing through the bypass path by adjusting the opening;
A deterrent mechanism that prevents water introduced into the heat pump path from the bypass path from flowing back into the tank through the heat pump path;
A water supply mechanism for supplying water to the heating path;
A control device for performing a test run,
The control device supplies water by the water supply mechanism during the trial operation, operates the first circulation pump, and adjusts the opening of the flow rate adjustment mechanism so that the water circulating in the heating path does not pass through the bypass path, The first specific operation for performing water filling of the heating path and the tank and the water supply mechanism supply water to operate the first circulation pump, and at least a part of the water circulating in the heating path passes through the bypass path. And a second specific operation for adjusting the opening of the flow rate adjusting mechanism and executing water filling of the bypass path and the heat pump path.   The heating device according to claim 1, wherein the control device executes the second specific operation when it is determined that the first specific operation is completed. Provided in the heat pump path, further comprising a second circulation pump for circulating the water in the heat pump path;
The control device according to claim 1 or 2, wherein the control device operates the second circulation pump in the second specific operation.

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