JP5087484B2 - Hot water storage hot water heater - Google Patents

Description

  The present invention relates to a freeze prevention operation of a hot water storage type hot water supply and heating apparatus using hot water storage hot water for hot water supply as a heat source for heating.

Conventionally, as this type of hot water storage type hot water supply and heating apparatus, one shown in FIG. 15 filed earlier by the applicant of the present application has been proposed (see FIG. 12 of Patent Document 1).
In this hot water storage type hot water heater, a hot water storage tank 101 for storing hot water for hot water supply, a heating means 102 for circulating and heating the hot water in the hot water storage tank 101, and hot water in the hot water storage tank 101 on the primary side. A heating heat exchanger 103 for heating the secondary heating circulation water as a heat source, a heating circulation pump 104 for circulating hot water in the upper part of the hot water storage tank 101 to the heating heat exchanger 103, and the heating heat A primary heating return path 105 for returning the primary hot water radiated by the exchanger 103 to the hot water storage tank 101 without passing through the heating means 102, and the primary hot water radiated by the heating heat exchanger 103 The sub-heating return path 106 that returns to the hot water storage tank 101 via the heating means 102 and the primary hot water radiated by the heating heat exchanger 103 do not pass through the heating means 102. A switching valve 107 for switching between returning to the hot water storage tank 101 via the main heating return path 105 or returning to the hot water storage tank 101 via the auxiliary heating return path 106 and the heating means 102, and control for controlling these. Means 108, and the control means 108 switches the switching valve 107 to the side passing through the main heating return path 105 during the heating operation to transfer the hot water in the hot water storage tank 101 to the heating heat exchanger 103. In addition, when it becomes necessary to perform the freeze prevention operation of the heating means 102 during the heating operation, the switching valve 107 is switched to the side passing through the heating means 102 and the auxiliary heating return path 106. The hot water radiated by the heat exchanger for heating 103 is circulated to the heating means 102, and the switching valve 107 is moved to the main valve after a predetermined time has elapsed. Were those to control so as to return to the side via the tufts return path 105.
Japanese Patent Application No. 2007-68877

  In this conventional apparatus, in the freeze prevention operation of the heating means 102, the hot water having a temperature lowered by the heating heat exchanger 103 is caused to flow to the heating means 102, whereby the relatively warm hot water is circulated efficiently. Although the freeze prevention operation is going to be performed, the time for circulation to the heating means 102 for the freeze prevention operation is fixed for a certain time, and the hot water exceeds the circulation time really necessary for the freeze prevention operation. Since it is circulated, wasteful heat dissipation is performed, and there is a problem that the amount of stored hot water in the hot water storage tank 101 is consumed wastefully.

  For this reason, if the predetermined time is determined in advance by experiments or the like so as to be the minimum necessary circulation time, unnecessary heat radiation can be eliminated, but the number of rotations of the heating circulation pump 104 for circulating hot water to the heating means 102 is If it changes, the minimum necessary circulation time will change, and it may be considered that excessive circulation will generate a lot of heat loss, or that the circulation may be insufficient and the freeze prevention operation cannot be completed.

  Therefore, an object of the present invention is to ensure that the freeze prevention operation of the heating means can be completed with minimum heat loss.

  In order to solve the above problems, the present invention provides a hot water storage tank for storing hot water for hot water supply, a heating means for circulating and heating the hot water in the hot water storage tank, and hot water for the hot water storage tank. A heating heat exchanger for heating secondary heating circulation water as a primary heat source, a heating circulation pump for circulating hot water in the upper part of the hot water storage tank to the heating heat exchanger, and the heating heat The main heating return path for returning the primary hot water radiated by the exchanger to the hot water storage tank without passing through the heating means, and the primary hot water radiated by the heating heat exchanger via the heating means And returning the primary hot water radiated by the heating heat exchanger to the hot water storage tank via the main heating return path without passing through the heating means, Before the auxiliary heating return path and the heating means A switching valve for switching whether to return to the hot water storage tank, and a control means for controlling the switching valve, and the control means switches the switching valve to the side passing through the main heating return path during the heating operation. The hot water is circulated to the heating heat exchanger, and when it becomes necessary to perform the freeze prevention operation of the heating means during the heating operation, the switching valve is connected to the heating means and the auxiliary heating return path. The hot water after being radiated by the heating heat exchanger is circulated through the heating means, and the switching valve is returned to the side via the main heating return path after a predetermined circulation time. And the predetermined circulation time is changed according to the number of rotations of the heating circulation pump.

  According to a second aspect of the present invention, the control means stores in advance a predetermined time corresponding to the number of rotations of the heating circulation pump, and it is necessary to perform a freeze prevention operation of the heating means during the heating operation. When the rotation speed of the heating circulation pump is changed after switching the switching valve to the side passing through the heating means and the sub-heating return path, the progress degree of the predetermined time at the rotation speed before the change is calculated, The remaining time obtained by subtracting the value obtained by multiplying the predetermined time at the rotation speed after the change by the degree of progress from the predetermined time at the rotation speed after the change is set as the predetermined circulation time.

  As described above, according to the present invention, even if the rotation speed of the heating circulation pump fluctuates due to fluctuations in the heating load or the like, hot water is circulated through the heating means for a predetermined circulation time corresponding to this rotation speed. Even if the rotation speed of the circulation pump can be changed, the freeze prevention operation of the heating means can be reliably completed with a minimum heat loss.

  Also, even if the rotation speed of the heating circulation pump fluctuates due to fluctuations in the heating load during freeze prevention operation that circulates hot water to the heating means, the remaining time after that is calculated from the degree of progress at the previous rotation speed Therefore, even if there is a change in the number of rotations, the freeze prevention operation of the heating means can be reliably completed with minimal heat loss.

Next, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, 1 is a hot water storage tank for storing hot water, 2 is a heat pump heating means for heating the hot water in the hot water storage tank 1, and 3 is for heating the secondary side using the hot water in the hot water storage tank 1. A heating heat exchanger for heating the circulating water, 4 is a secondary side of the heating heat exchanger 3 in which the circulating water for heating is connected to a heating load (not shown) such as a floor heating panel. A secondary side heating circulation circuit 5 is a secondary side heating circulation pump provided in the secondary side heating circulation circuit 4.

  Here, the heat pump heating means 2 will be described in detail. A compressor (not shown), a water refrigerant heat exchanger (not shown) as a gas cooler for heating hot water in the hot water storage tank 1, and a decompressor (not shown). 1), an air heat exchanger (not shown) as an evaporator is connected in a ring shape, carbon dioxide is enclosed as a refrigerant, and forms a supercritical vapor compression heat pump cycle that becomes a supercritical state on the high pressure side It is.

  6 is a water inlet pipe for supplying city water to the bottom of the hot water storage tank 1, 7 is a hot water outlet pipe for discharging hot water from the upper part of the hot water storage tank 1, 8 is an intermediate hot water outlet pipe for discharging hot water from the intermediate part of the hot water storage tank 1, 9 An intermediate mixing valve 10 for mixing hot water from the hot water outlet pipe 7 and the intermediate hot water pipe 8 at an appropriate temperature, 10 is an intermediate hot water pipe for supplying hot water from the intermediate mixing valve 9, 11 is a water supply pipe branched from the incoming water pipe 6, and 12 is an intermediate A hot water supply mixing valve 13 for mixing hot water from the hot water supply pipe 10 and city water from the water supply pipe 11 to a set temperature, and 13 is a hot water supply pipe for supplying hot water from the hot water mixing valve 12.

  14 is a first pipe connecting the lower part of the hot water storage tank 1 and the inlet of the heat pump type heating means 2, 15 is provided in the middle of the first pipe 14, and the hot water in the lower part of the hot water storage tank 1 is circulated to the heat pump type heating means 2. And a circulating pump for circulating hot water in the upper part of the hot water storage tank 1 to the heat exchanger 3 for heating, 16 is a second pipe connecting the outlet of the heat pump type heating means 2 and the upper part of the hot water storage tank 2, and 17 is a second pipe. It is the 3rd pipe line which connects the way 16 way and the entrance of heat exchanger 3 for heating. The circulation pump 15 serves as a heating circulation pump for circulating hot water to the heat pump heating means 2 and a heating circulation pump for circulating hot water to the heating heat exchanger 3.

  Reference numeral 18 denotes a first three-way valve provided at a connection point between the second pipe line 16 and the third pipe line 17, and the first three-way valve 18 is connected to the a port on the third pipe line 17 side or the second pipe line 16. Either one of the b ports on the hot water storage tank 1 side can be selectively connected to the c port on the heat pump type heating means 12 side of the second conduit 16, and preferably hot water from the c port is connected to the a port and b It is desirable to have a distribution valve configured to distribute the flow rate at a ratio that is arbitrarily adjusted to the port.

  19 is a fourth pipe connecting the outlet of the heat exchanger 3 for heating and the hot water storage tank 1 side of the circulation pump 15 of the first pipe 14, and 20 is a connection between the fourth pipe 19 and the first pipe 14. It is the 2nd three-way valve provided in the connection point. The second three-way valve 20 has either the a port on the fourth line 19 side or the b port on the hot water storage tank 1 side of the first line 14 as the c port on the suction side of the circulation pump 15 of the first line 14. To be selectively connectable.

  21 is a fifth pipe connecting the heat pump type heating means 2 side of the first pipe 14 to the lower side of the hot water storage tank 1 with respect to the circulating pump 15, and 22 is a middle of the fourth pipe 19 and a middle of the fifth pipe 21. The fifth pipe 21 functions as a main heating return path for returning the primary hot water radiated by the heating heat exchanger 3 to the hot water storage tank 1 without passing through the heating means 2. It is what.

  23 is a third three-way valve provided at a connection point between the fifth pipe line 21 and the sixth pipe line 22, and the third three-way valve 23 is connected to the a port on the sixth pipe line 22 side or the fifth pipe line 21. Any one of the b ports on the hot water storage tank 1 side can be selectively connected to the c port on the discharge side of the circulation pump 15 of the fifth pipe line 21 and all the a port, b port and c port are closed simultaneously. It has a possible configuration.

  Reference numeral 24 denotes a seventh pipe connected to the lower part of the hot water storage tank 1 from the middle of the second pipe 16, and reference numeral 25 denotes a fourth three-way valve provided at a connection point between the second pipe 16 and the seventh pipe 24. The fourth three-way valve 25 is either an a port on the hot water storage tank 1 side of the second pipe line 16 or a b port on the seventh pipe line 24 side, and a c port on the heat pump heating means 2 side of the second pipe line 16. And a port, b port, and c port can be closed simultaneously. In addition, it is desirable that the seventh pipe line 24 has a configuration partially shared with the water inlet pipe 6.

  The heating means 2 side from the branch point with the fifth pipe line 21 downstream of the circulation pump 15 of the first pipe line 14, and between the heating means 2 and the fourth three-way valve 25 of the second pipe line 16; It functions as a sub-heating return path for returning the primary hot water radiated by the heating heat exchanger 3 in the seventh conduit 24 to the hot water storage tank 1 via the heating means 2.

  Then, the third three-way valve 23 and the fourth three-way valve 25 return the primary hot water radiated by the heating heat exchanger 3 to the hot water storage tank 1 via the main heating return path without passing through the heating means 2. It functions as a switching valve that switches between returning to the hot water storage tank 2 via the auxiliary heating return path and the heating means 2.

  26 is an eighth pipe branched from the hot water storage tank 1 side of the second pipe 16 from the first three-way valve 18 and connected to the intermediate portion of the hot water storage tank 1, and 27 is the second pipe 16 and the eighth pipe 26. Is a fifth three-way valve provided at the connection point. In the fifth three-way valve 27, the c port on the heat pump heating means 2 side of the second conduit 16 is either the a port on the hot water storage tank 1 side of the second conduit 16 or the b port on the eighth conduit 26 side. In addition, the a port and the b port can be closed simultaneously.

  A control means 28 includes a microcomputer capable of storing and calculating, and controls these components based on a program stored in advance, and performs hot water storage operation, hot water supply operation, heating operation, and freeze prevention operation described later. .

Next, the operation of this embodiment will be described.
FIG. 2 is a diagram for explaining the operation at the time of starting up the heat pump heating means 2 (HP start-up operation). The second three-way valve 20 is made to communicate with the b port and the c port, and all the third three-way valves 23 are connected. The port is closed and the fourth three-way valve 25 is connected to the c port and the b port, and the heat pump heating means 2 and the circulation pump 15 are driven so that the hot water taken out from the hot water storage tank 1 is discharged. The heat is circulated through the first pipe 14 and returned to the lower part of the hot water storage tank 1 through the second pipe 16 and the seventh pipe 24. In this HP startup operation, the heat pump cycle is stabilized after starting the compressor of the heat pump type heating means 2, and the temperature of the hot water actually boiled from the heat pump type heating means 2 rises to a desired temperature. However, it takes about 5 to 10 minutes, and the hot water boiled in the meantime is returned to the lower part of the hot water storage tank 1. By doing in this way, the hot water of a halfway temperature is not supplied to the upper part in the hot water storage tank 1.

  When the temperature of the heated hot water reaches a desired temperature, the HP startup operation is terminated, and the hot water storage operation shown in FIG. 3 is performed. In this hot water storage operation, from the HP start-up operation state, the fourth three-way valve 25 is communicated with the c port and the a port, the first three-way valve 18 is communicated with the c port and the b port, and the fifth three-way valve 27 The c port and the a port communicate with each other. Then, the low-temperature water in the lower part of the hot water storage tank 1 is boiled up to a desired high temperature by the heat pump type heating means 2 by the operation of the circulation pump 15, and the hot water is sequentially stored in a stacked form from the upper part of the hot water storage tank 1.

  Next, a case where the heating operation is performed will be described. FIG. 4 is a diagram for explaining a heat storage operation in which heating is performed using high-temperature water in the hot water storage tank 1 boiled in the midnight time zone, and the fifth three-way valve 27 is made to communicate with the a port and the c port. The first three-way valve 18 communicates with the port a and the port b, the second three-way valve 20 communicates with the port a and the port c, and the third three-way valve 23 communicates with the port b and the port c. In addition, the circulating pump 15 is driven, and the hot water in the upper part of the hot water storage tank 1 is supplied to the second pipeline 16, the third pipeline 17, the fourth pipeline 19, the first pipeline 14, the circulation pump 15, The heat is stored by supplying the heat to the secondary side heating circulation circuit 4 on the secondary side of the heat exchanger 3 for heating by circulating in the order of the five pipe lines 21 and returning to the lower part (or intermediate part) of the hot water storage tank 1. Do the driving.

  In order to prevent circulating hot water not related to the operation, it is desirable to set a three-way valve not related to the operation at an appropriate position. Here, the fourth three-way valve 25 is By making the fully closed state, unnecessary hot water circulation can be prevented, efficient heat storage operation can be performed, and the temperature stratification state of the hot water in the hot water storage tank 1 is disturbed excessively. This can be prevented.

  Here, the control means 28 controls the rotational speed of the circulation pump 15 so that the temperature of the heating circulating water on the secondary side of the heating heat exchanger 3 becomes a predetermined forward temperature. When the forward temperature is higher than the predetermined forward temperature, the rotational speed of the circulation pump 15 is decreased, and when the actual forward temperature is lower than the predetermined forward temperature, the rotational speed of the circulation pump 15 is increased. That is, the rotation speed of the circulation pump 15 is made to fluctuate according to the fluctuation of the heating load.

  When the amount of stored heat in the hot water storage tank 1 detected by hot water storage temperature sensors (not shown) provided on the side surface of the hot water storage tank 1 is less than a predetermined value, the heat pump heating means 2 is activated to boil up. Heating is performed using hot water. At that time, since it takes time to start up the heat pump heating means 2, the warm-up operation + HP start-up operation shown in FIG. 5 is performed until the heat pump cycle rises. From the state of the heat storage operation, the third three-way valve 18 is communicated with the a port and the b port, the fourth three-way valve 25 is communicated with the c port and the b port, and all the third three-way valves 23 are connected. And the heat pump heating means 2 is started.

  Thereby, the high-temperature water in the upper part of the hot water storage tank 1 is supplied from the second pipe 16, the third pipe 17, the heating heat exchanger 3, the fourth pipe 19, the circulation pump 15, the first pipe 14, and the heat pump heating. The hot water after flowing in the order of the means 2, the second pipe line 16, and the seventh pipe line 24 is returned to the lower part of the hot water storage tank 1 and radiated by the heat exchanger 3 for heating flows into the heat pump heating means 2. Therefore, the warming-up operation and the HP startup operation can be efficiently performed simultaneously without causing a low water temperature of the heat pump heating means 2 and causing a high pressure abnormality in the heat pump cycle.

  Then, when the temperature of the hot water boiled by the heat pump heating means 2 reaches a predetermined temperature or more, the warm-up operation + HP start-up operation is terminated, and the high-temperature water boiled by the heat pump heating means 2 as shown in FIG. Is directly distributed to the heat exchanger 3 for heating, and a direct warming operation and a hot water storage operation are performed in which the hot water storage operation is performed.

  In the direct warming operation + hot water storage operation shown in FIG. 6, from the state of the previous warming operation + HP startup operation, the second three-way valve 20 is made to communicate with the b port and the c port, and the third three-way valve 23 is set to a The port is connected to the c port, the fourth three-way valve 25 is connected to the c port and the a port, the low temperature water in the lower part of the hot water storage tank 1 is circulated through the first pipe line 14 and the circulation pump 15, and the heat pump The heating means 2 is heated to a predetermined high temperature, and the second pipe 16, the third pipe 17, the heating heat exchanger 3, the fourth pipe 19, the sixth pipe 22, and the fifth pipe 21 are arranged in this order. The hot water boiled to a predetermined high temperature in the heat pump heating means 2 is returned to the lower part (or intermediate part) of the hot water storage tank 1 after being directly used as a heat source for heating by the first three-way valve 18. A part of the water is diverted and hot water is stored in the first pipeline 16 Flows toward the first upper, is the hot water storage in layers from the top of the hot water storage tank 1.

  Here, the first three-way valve 18 is a distribution valve capable of adjusting the ratio of the flow rate on the a port side and the flow rate on the b port side, and heat pump heating means according to the amount of residual heat in the hot water storage tank 1 and the state of the heating load. The distribution ratio of the hot water boiled in 2 can be changed. For example, when the heating load is relatively small and the amount of remaining hot water is small, the flow rate ratio on the b port side of the first three-way valve 18 is increased. While the heat pump type heating means 2 operates at the rated capacity, the heating output can be reduced to increase the amount of heat to be stored, and efficient operation is possible.

  In addition, when the remaining amount of hot water in the hot water storage tank 1 is ensured (the amount necessary for hot water supply), the amount of heat is not secured in the hot water storage tank 1 for heating, and the heating load is large. As shown in FIG. 7, only the direct warming operation is performed. Here, the b port of the first three-way valve 18 is fully closed and the a port is fully opened, so that all of the high-temperature water boiled by the heat pump heating means 2 flows to the heating heat exchanger 3. If the heating load decreases and falls below the rated capacity of the heat pump type heating means 2, the b port side of the first three-way valve 18 is opened, and direct heating operation + hot water storage operation is performed as shown in FIG. By doing so, efficient operation can be performed.

  Here, since the heat pump heating means 2 is arranged so as to be able to exchange heat with the outside air, the hot water circulation circuit to the heat pump heating means 2 may freeze when the outside air temperature is low. Therefore, in the warm-up operation shown in FIG. 4, when the freeze prevention operation needs to be performed, the warm-up operation + HP freeze prevention operation shown in FIG. 8 is periodically performed for a predetermined circulation time.

  The warm storage operation + HP freeze prevention operation will be described with reference to the flowcharts of FIGS. 4, 8, and 9. When the freeze prevention operation request is generated from the state of the warm storage operation of FIG. 4 (step S1), The three-way valve 23 is fully closed to close all the ports, the fourth three-way valve 25 is connected to the c port and the b port, and the switching valve is switched to the auxiliary heating return path side (step S2), FIG. Is switched to the warm storage operation + HP freezing prevention operation state shown in FIG. 2, and the hot water which has been heated by the heating heat exchanger 3 and lowered in temperature flows through the fourth pipe line 19 and the first pipe line 14 to heat pump type heating means 2, flows through the second pipe line 16 and the seventh pipe line 24, and returns to the lower part (or intermediate part) of the hot water storage tank 1, thereby freezing the heat pump heating means 2 and the pipes leading to the heat pump type heating means 2. Preventive driving It is.

  Thus, since the heat pump type heating means 2 can be prevented from freezing using the hot water whose temperature has been reduced by exchanging heat in the heating heat exchanger 3, it is possible to return to the heating heat exchanger 3 without stopping the heat storage operation. HP freezing prevention operation can be performed by the amount of residual heat supplied, and the temperature of the hot water returned to the hot water storage tank 1 is lowered, and the temperature of the supplied water to the heat pump heating means 2 can be suppressed in the next hot water storage operation, so that the boiling efficiency is improved. Is.

  At this time, the control means 28 determines a predetermined circulation time for continuing the HP freeze prevention operation from the rotation speed of the circulation pump 15 in step S3. The rotation speed of the circulation pump 15 as shown in Table 1 is determined. Predetermined time corresponding to each is stored in advance, when the rotation speed of the circulation pump 15 is high, the predetermined circulation time is shortened, and when the rotation speed of the circulation pump 15 is low, the predetermined circulation time is set longer. Yes. In this way, by changing the predetermined circulation time according to the number of rotations of the circulation pump 15, the heat pump type heating means 2 can make one round of hot water without excess or deficiency, and the freeze prevention operation can be ensured with a minimum heat loss. Can be completed.

  In addition, as shown in Table 1, the predetermined time according to the rotation speed of the circulation pump 15 is stored according to the installation status of the hot water storage tank 1 and the heat pump heating means 2, respectively. This installation status is the standard installation state when the connection distance of the heating means 2 is within a predetermined distance and within a predetermined height difference, and the extended installation when the connection distance is a predetermined distance or more or a predetermined height difference or more. Can be preliminarily input to the control means 28, so that the warm water can be circulated more reliably and without excess and deficiency, and the freeze prevention operation can be completed with a minimum heat loss.

When a predetermined circulation time has elapsed from the start of the warm-up operation + HP freeze prevention operation (Yes in step S4), the third three-way valve is made to communicate with the b port and the c port, and the fourth three-way valve 25 is set to all The port is returned to the fully closed state, and the switching valve is switched to the main heating return path side (step S5) to return to the warm-up operation shown in FIG.

  In addition, when the heating load changes during the freeze prevention operation and the rotation speed of the circulation pump 15 is changed (Yes in step S6), the progress degree of the predetermined time at the rotation speed before the change is determined. The remaining time obtained by subtracting the value obtained by multiplying the predetermined time at the rotation speed after the change by the degree of progress from the predetermined time at the rotation speed after the change is defined as a predetermined circulation time (step S7), and the remaining circulation time The HP freeze prevention operation is continued until the time has elapsed.

  Here, a description will be given assuming a specific situation. Now, during the warming-up operation of the hot water storage type hot water heater with the standard installation state, the freeze pump operation is started when the rotation speed of the circulation pump 15 is “low”, and after 5 minutes, the rotation speed of the circulation pump 15 is “medium”. Will be described, and the number of rotations of the circulation pump 15 changed to “high” after two minutes have passed.

  Of the predetermined time of 10 minutes of “low”, 5 minutes have passed, and at the time of changing to “medium”, the degree of progress is 5/10 = 0.5, so 6 × (1-0. 5) = Remaining time of 3 minutes. From this point, when 2 minutes have elapsed, the degree of progress is 0.5+ (2/6) ≈0.83, so 4 × (1−0.83) = 0.68 minutes≈41 seconds remaining time, and circulation When 41 seconds elapse without the rotation speed of the pump 15 changing, the freeze prevention operation is terminated and the warm-up operation is returned.

  Next, the HP freeze prevention operation when the warming-up operation or the direct warming operation is not performed will be described with reference to FIG. 10. The same piping path as the HP start-up operation shown in FIG. In a state where the heating means 2 is not activated, the hot water in the lower part of the hot water tank 1 is circulated to the heat pump type heating means 2 and returned to the lower part (or intermediate part) of the hot water tank 1 so that the heat pump type heating means 32 is periodically provided for a certain time. Freezing prevention is performed.

  The fixed time in this case can be set to a fixed fixed time obtained in advance through experiments or the like because the circulation pump 15 can be operated only for the HP freeze prevention operation and can be operated at a fixed rotation speed. However, when the installation state is extended installation, the fixed fixed time may be corrected longer.

  Furthermore, as shown in FIG. 11, the HP freeze prevention operation can be performed using medium temperature water in the hot water storage tank 1. The b port and c port communicate with the fifth three-way valve 27, the b port and a port communicate with the first three-way valve 18, and the a port and c port communicate with the second three-way valve 20. The third three-way valve 23 is fully closed with all the ports closed, the fourth three-way valve 25 is connected to the c port and the b port, and the intermediate temperature water stored in the intermediate portion of the hot water storage tank 1 is Pipe line 26, second pipe line 16, third pipe line 17, first pipe line 14, circulation pump 15, heat pump heating means 2, second pipe line 16, seventh pipe line 24, lower part of hot water storage tank 1 It is possible to prevent the heat pump heating means 2 from freezing, and the medium temperature water in the hot water storage tank 1 is lowered in temperature and returned to the hot water storage tank 1 so that the heating efficiency of the heat pump heating means 2 is improved. Effective use of bad medium temperature water during hot water storage operation Thermal efficiency is also one which can be improved.

  In addition, the other form of the direct warming driving | operation in this one Embodiment is demonstrated based on FIG. In the direct warming operation shown in FIG. 6 or 7, the hot water radiated by the heating heat exchanger 3 is returned to the lower part (or the middle part) of the hot water storage tank 1, and the heat pump type heating means 2 lowers the hot water storage tank 1. Although the hot water flowing out from the heater is heated, the hot water radiated by the heat exchanger 3 for heating is directly circulated to the heat pump heating means 2 and heated as in another form of the direct warming operation shown in FIG. It is also possible to do so. Here, the third three-way valve 23 is in a fully closed state in which all ports are closed, the fourth three-way valve 25 is connected to the c port and the a port, and the first three-way valve 18 is connected to the c port and the a port. The second a three-way valve 20 is communicated with the a port and the c port, and the circulation pump 15 is driven so that the circulation pump 15, the first pipeline 14, the heat pump heating means 2, and the second pipeline 16, the third pipe line 17, the heating heat exchanger 3, the fourth pipe line 19, and the circulation pump 15 are circulated and heated to perform a direct warming operation.

  And when performing hot water supply, as shown in FIG. 13, when the faucet (not shown) at the end of the hot water supply pipe 13 is opened, city water flows from the water intake pipe 6 into the lower part of the hot water storage tank 1, Hot water is discharged from the hot water supply pipe 7, flows through the intermediate hot water supply pipe 10 through the intermediate mixing valve 9, mixed with city water from the hot water supply pipe 11 by the hot water supply mixing valve 12, adjusted to the set temperature, It flows out of the faucet through the pipe 13. Here, if there is a large amount of hot water stored in the intermediate portion of the hot water storage tank 1, the hot water and hot water are mixed using the intermediate mixing valve 9 or the hot water is discharged as it is. It is desirable to preferentially discharge hot water.

  And if the heat pump type heating means 2 is continuously operating during the direct warming operation, frost may adhere to the air heat exchanger depending on the climatic conditions. In such a case, the defrosting operation is performed, but by temporarily performing the warming-up operation, the heating loss can be prevented and the continuous heating can be continued. In addition, at that time, the defrosting operation of the air heat exchanger can be completed quickly by returning the hot water radiated by the heat storage operation to the hot water storage tank 1 via the heat pump heating means 2. It will be.

  In addition, this invention is not limited to the said one Embodiment, Various modifications in the range which does not change the summary of invention are possible, for example, as shown in FIG. And a system in which the HP circulation pump 31 is provided separately, and if only one switching valve 32 can serve the role, only one is sufficient. Further, the main heating return path 33 and the sub-heating return path 34 may also be configured differently from the above-described embodiment as long as they substantially function.

  In addition, the time shown in Table 1 is an example in the above-described embodiment, and the hot water makes a round of the heating means according to the installation conditions such as the capacity of the circulation pump for heating, the number of rotations, and the piping conditions. What is necessary is just to obtain and store the necessary time in advance by experiments.

1 is a system diagram of an embodiment of the present invention. The figure explaining HP starting operation of the same embodiment. The figure explaining the hot water storage driving | operation of the same embodiment. The figure explaining the thermal storage driving | operation of the same embodiment. The figure explaining the warm-up operation + HP start-up operation of the same embodiment. The figure explaining the direct warming operation | movement + hot water storage operation of the same embodiment. The figure explaining the direct warming driving | operation of the same embodiment. The figure explaining the thermal storage driving | operation + HP freezing prevention driving | operation of the same embodiment. The flowchart explaining the action | operation of the thermal storage driving | operation + HP freezing prevention driving | operation of the same embodiment. The figure explaining HP freezing prevention operation of the same embodiment. The figure explaining another form of HP freezing prevention driving | operation of the same embodiment. The figure explaining another form of the direct warming driving | operation of the same embodiment. The figure explaining the hot water supply driving | operation of the same embodiment. The system diagram of other embodiments of the present invention. The system figure of the conventional hot water storage type hot-water supply and heating apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heating means 3 Heat exchanger 14 for heating 1st pipe line (a part is subheating return path | route)
15 Circulation pump (circulation pump for heating)
16 Second pipe (partly sub-heating return path)
21 Fifth pipeline (main heating return route)
23 3rd way valve (switching valve)
24th pipeline (sub heating return route)
25 4th three way valve (switching valve)
28 Control means

Claims (2)

  A hot water storage tank for storing hot water for hot water supply, a heating means for circulating and heating the hot water in the hot water storage tank, and heating the secondary side heating circulating water using the hot water in the hot water storage tank as a primary heat source A heating heat exchanger for heating, a heating circulation pump for circulating hot water in the upper part of the hot water storage tank to the heating heat exchanger, and primary hot water radiated by the heating heat exchanger through the heating means. A main heating return path that returns to the hot water storage tank, a sub-heating return path that returns primary hot water radiated by the heating heat exchanger to the hot water storage tank via the heating means, and the heating heat The primary hot water radiated by the exchanger is returned to the hot water storage tank via the main heating return path without passing through the heating means, or returned to the hot water storage tank via the auxiliary heating return path and the heating means. A switching valve for switching between Control means for controlling, and during the heating operation, the control means switches the switching valve to the side passing through the main heating return path to circulate hot water in the hot water storage tank to the heating heat exchanger. In addition, when it becomes necessary to perform the freeze prevention operation of the heating means during the heating operation, the switching valve is switched to the side passing through the heating means and the auxiliary heating return path, and the heat exchanger for heating is used. The hot water after radiating heat is circulated through the heating means, and the switching valve is controlled to return to the side passing through the main heating return path after a predetermined circulation time has elapsed, and the predetermined circulation time is controlled by the heating circulation pump. A hot water storage type hot water supply and heating device characterized in that it is changed according to the number of rotations.   The control means stores in advance a predetermined time corresponding to the number of rotations of the heating circulation pump, and it becomes necessary to perform a freeze prevention operation of the heating means during the heating operation. When the rotation speed of the heating circulation pump is changed after switching to the side that passes through the sub-heating return path, the degree of progress of the predetermined time at the rotation speed before the change is calculated, and the rotation speed after the change is calculated. 2. The hot water storage type hot water supply and heating device according to claim 1, wherein a remaining time obtained by subtracting a value obtained by multiplying the predetermined time by the degree of progress from the predetermined time at the changed number of revolutions is set as a predetermined circulation time.

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