JP2015094545A - Heat pump hot water storage type hot water supply heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that when a temperature detected by a hot water storage temperature sensor of a hot water storage tank upper part is below a predetermined heatable lower limit temperature even in a state where a hot water heating terminal does need a high target outgoing temperature and can continue heating, heating operation is suspended.SOLUTION: Heating operation for a long term can be continued by enabling a predetermined heatable lower limit temperature to be changed so as to lower according to a heatable lower limit temperature, and at the same time, the risk that heat quantity in a hot water storage tank 1 is exhausted even when the heatable lower limit temperature is lowered is reduced, and thereby user-friendly heating operation capable of ensuring sufficient hot water storage heat quantity can be performed.

Description

  The present invention relates to a heat pump hot water storage type hot water supply and heating device that stores hot water boiled by a heat pump heating means and uses it as a heat source for hot water supply and heating.

Conventionally, heat pump heating means equipped with a heat pump that heats water to generate hot water, a hot water storage tank unit equipped with a hot water storage tank that stores hot water, and hot water stored in the hot water storage tank and water in the floor heating circuit In a heat pump hot water storage water heater with a heat exchanger that performs heat exchange and a floor heating panel that circulates and heats hot water that has been heat-exchanged and heated, The amount of heat for heating is boiled by the heat pump heating means and stored in the hot water storage tank, and if the amount of heat stored in the hot water storage tank is insufficient, the heat pump heating means is operated even during daytime hours to boil the shortage of heat. More heat was stored in the hot water storage tank. (Patent Document 1)

JP 2008-25945 A

  However, although not disclosed in the patent literature, in such a conventional one, in order to ensure the amount of heat required for hot water supply and the minimum amount of heat necessary for heating operation (for example, floor heating), the hot water storage temperature at the upper part of the hot water storage tank When the temperature of the sensor became lower than a predetermined temperature (for example, 60 ° C.), the heating operation was interrupted even when the heating operation was being performed, and the boiling was increased.

  For this reason, if the hot water heating terminal is sufficiently warm after the heating operation and the hot water storage temperature sensor at the upper part of the hot water storage tank is lower than the predetermined temperature even when the hot water heating temperature is not required, the heating operation is performed. Had the problem of being interrupted.

  A hot water storage tank, a heat pump circulation circuit that heats water from the lower part of the hot water storage tank by a heat pump heating means and returns it to the upper part of the hot water storage tank, and returns from the upper part of the hot water storage tank to the hot water storage tank via a heating heat exchanger A primary side circulation circuit, a hot water heating terminal and a secondary side circulation circuit including the heating heat exchanger, and detecting temperatures of an inlet and an outlet of a heating heat exchanger provided in the primary circulation circuit, respectively Heat exchange primary inlet temperature sensor and heat exchange primary outlet temperature sensor provided, and heat exchange secondary provided respectively for detecting the temperature of the inlet and outlet of the heating heat exchanger provided in the secondary side circulation circuit An inlet temperature sensor, a heat exchange secondary outlet temperature sensor, a primary circulation pump of the primary circulation circuit, a secondary circulation pump of the secondary circulation circuit, and a temperature in the hot water storage tank are detected. Hot water storage temperature sensor And a control device for controlling the driving of the primary side circulation pump and the secondary side circulation pump, and a remote controller capable of setting a heating set temperature. The control device is capable of heating the hot water storage temperature sensor. When the temperature lower than the lower limit temperature is detected, the heating operation is interrupted and the lower limit temperature for heating is made changeable.

Further, the lower limit temperature for heating is changed based on the heating set temperature set by the remote controller.

Further, the lower limit temperature for heating is changed based on the target going temperature of the heat exchange secondary side outlet temperature sensor.

  Thus, according to the present invention, the hot water storage temperature sensor at the upper part of the hot water storage tank has a predetermined time when a sufficient time has passed after the heating operation, the hot water heating terminal is sufficiently warm, and a high heating forward temperature is not required. Even if the temperature is lower than the temperature, it is possible to continue the heating operation for a long time by making it changeable to lower the lower limit temperature that can be heated, and at the same time, the amount of heat in the hot water storage tank can be reduced even if the lower limit temperature that can be heated is lowered. It is possible to reduce the risk of exhaustion and to enable a convenient heating operation that can secure a sufficient amount of stored hot water.

The block diagram of the heat pump hot water storage type hot water supply and heating apparatus of 1st Embodiment of this invention The flowchart for demonstrating control of 1st Embodiment. Time chart of the first embodiment Flowchart for explaining control of the second embodiment Time chart of the second embodiment

1st Embodiment of the heat pump hot water storage type hot-water supply heating apparatus of this invention is described based on FIG.
1 is a hot water storage tank for storing hot water, 2 is a water supply pipe connected to the lower part of the hot water storage tank 1, 3 is a hot water supply pipe connected to the upper part of the hot water storage tank, and 4 is a heat pump heating means for heating the hot water in the hot water storage tank 1 5 is a heat pump circulation circuit that connects the lower part of the hot water storage tank 1, the heat pump type heating means 4 and the upper part of the hot water storage tank 1 so that the hot water in the hot water storage tank 1 can be circulated. It is. Moreover, although not shown in figure, the hot water filling circuit branched from the hot water supply pipe | tube 3 to the bathtub is provided.

Next, 7 is a heating heat exchanger for heating the circulating fluid on the secondary side with hot water in the hot water storage tank 1, and 8 is 1 for circulating the hot water in the hot water storage tank 1 to the heating heat exchanger 7. A secondary side circulation circuit, 9 is a primary side heating pump provided in the middle of the primary side circulation circuit 8, 10 is a hot water heating terminal such as a hot water type floor heating panel, and 11 is a secondary side of the heating heat exchanger 7. A secondary side circulation circuit for connecting the circulating water for heating to the hot water heating terminal 10 so that it can circulate, 12 is a secondary side heating pump provided in the middle of the secondary side circulation circuit, and these constitute a heating circuit Yes.

13a to 13d are a plurality of hot water storage temperature sensors provided on the upper and lower sides of the hot water storage tank 1, T1 is a heat exchange primary inlet temperature sensor for detecting the temperature of the hot water flowing into the heating heat exchanger, and T2 is a heating system. Heat exchange primary outlet temperature sensor for detecting the return temperature of the heating heat exchanger flowing out from the heat exchanger, T3 is a heat exchange secondary inlet temperature sensor for detecting the return temperature of heating, and T4 is a heat exchange 2 for detecting the temperature of the outgoing heating. The next outlet temperature sensor 14 is a control device that controls the operation of the device by performing a predetermined calculation based on the output of each temperature sensor. By the combination of the detected temperature of the hot water storage temperature sensor 13 and the capacity information given in advance. The hot water storage amount or the hot water storage amount in the hot water storage tank 1 is detected.

Reference numeral 15 denotes a remote controller that can freely change the heating set temperature (in this case, 9 steps in increments of 3 ° C. from 23 ° C. to 47 ° C.), and the user can freely perform heating operation at a necessary temperature. Information on the heating operation setting by the remote controller 15 is sent to the control device 14, and control such as temperature change and operation switching is performed. 16 is an operation switch for switching between heating operation and stoppage, 17 is a display unit indicating the current heating setting temperature, 18 is a temperature lowering button for decreasing the heating setting temperature, and 19 is a temperature increasing button for increasing the heating setting temperature.

  At midnight, the control device 14 operates the heat pump heating means 4 and the heat pump circulation pump 6 until the next morning, and cools the hot water taken out from the lower part of the hot water storage tank 1 to the water (not shown) inside the heat pump heating means 4. Heating up to a predetermined high temperature with a heat exchanger and returning it to the upper part of the hot water storage tank 1, the boiling operation is performed by the amount of heat corresponding to the predicted hot water supply and heating load on the next day.

When the faucet provided at the end of the hot water supply pipe 3 is opened, city water is supplied into the hot water storage tank 1 from the water supply pipe 2 at the lower part of the hot water storage tank 1, and hot hot water is supplied from the hot water supply pipe 3 at the upper part of the hot water storage tank 1. Hot water is supplied.

However, if the controller 14 determines that the hot water storage temperature detected by the hot water storage temperature sensor 13a at the upper part of the hot water storage tank 1 has risen and falls below the start temperature of 70 ° C. due to long-time heating operation or a large amount of hot water discharge, Even during this time, the heat pump heating means 4 and the heat pump circulation pump 6 are operated, and the low temperature hot water taken out from the lower part of the hot water storage tank 1 is heated to a predetermined high temperature by a water heat exchanger (not shown) inside the heat pump heating means 4. The boiling increase operation to start heating and return to the upper part of the hot water storage tank 1 is started.

Next, the heating operation will be described.
When there is a heating operation request, the control device 14 drives the primary side circulation pump 9 and the secondary side circulation pump 12, and on the primary side, hot water flows from the upper part of the hot water storage tank to the heating heat exchanger 7 and goes to the lower part of the hot water storage tank 1. And circulate. On the secondary side, the circulating fluid for heating heated by the heating heat exchanger 7 in the secondary side circulation circuit 11 by the driving of the secondary side circulation pump 12 flows to the hot water heating terminal 10 and dissipates heat. It returns to the heating heat exchanger 7 again and is heated to perform the heating operation.

When the heating operation is started, the control device 14 performs the primary operation so that the temperature detected by the heat exchange secondary outlet temperature sensor T4 becomes a predetermined target forward temperature (here, 55 ° C.) regardless of the heating set temperature. The flow rate of the hot water circulated to the heating heat exchanger 7 is adjusted by changing the rotational speed of the side circulation pump 9. Then, after the target change prohibition time of the target forward temperature (here, 30 minutes), the controller 14 causes the heat exchange secondary outlet so that the temperature detected by the heat exchange secondary inlet temperature sensor T3 matches the heating set temperature. When the temperature detected by the heat exchange secondary inlet temperature sensor T3 is higher than the heating set temperature with the target forward temperature of the temperature sensor T4 being 55 ° C. as an upper limit here, the target forward temperature is lowered and the heat exchange secondary inlet temperature When the temperature detected by the sensor T3 is lower than the heating set temperature, the target forward temperature is raised.

When the controller 14 determines that the hot water storage temperature detected by the hot water storage temperature sensor 13a in the upper part of the hot water storage tank 1 has fallen below a predetermined lower limit temperature for heating due to a long heating operation or a large amount of hot water, heating is interrupted. Thus, the heating operation is restarted when the hot water storage temperature detected by the hot water storage temperature sensor 13a exceeds the lower limit of the heating possible temperature + 5 ° C.

Here, the control device 14 is configured to be able to change the lower limit temperature at which heating is possible, and the operation of the first embodiment will be described in detail based on the flowchart shown in FIG.

When the operation switch 16 for heating operation is turned on (S1), the control device 14 sets the lower limit temperature for heating to 60 ° C., which is higher than the target forward temperature at the time of startup (S2). When it is determined that the temperature of the upper part of the hot water storage tank 1 detected by the hot water storage temperature sensor 13a by the control device 14 is equal to or higher than the lower limit temperature (60 ° C in this case) that can be heated (S3), the heating operation is started. (S4).

When the target change temperature target change prohibition time of 30 minutes has elapsed since the start of the heating operation (S5), the target return temperature can be changed. If the heating set temperature set by the remote controller 15 is less than a predetermined medium temperature (40 ° C. in this case), the process proceeds to the next heating possible lower limit temperature changing step (S6), and the heating possible lower limit temperature is changed to the heating set temperature. The temperature is set to + 10 ° C. and the heating operation is continued (S7). If the heating set temperature set by the remote controller 15 is equal to or higher than the predetermined medium temperature (NO in S6), the heating operation is continued with the heating possible lower limit temperature kept at 60 ° C.

Then, when the heating operation is continued and the temperature of the hot water heating terminal 10 rises with time as shown in FIG. 3, the temperature detected by the heat exchange secondary inlet temperature sensor T3 approaches the heating set temperature, and the target The going-out temperature is gradually lowered.

Here, when the amount of heat in the hot water storage tank 1 is consumed by heating or hot water supply and the temperature of the upper part of the hot water storage tank 1 becomes lower than the lower limit temperature for heating (S8), the heating operation is interrupted (S9).

At this time, since the temperature detected by the hot water storage temperature sensor 13a in the upper part of the hot water storage tank 1 has increased below the starting temperature, the additional heating operation is performed, and the additional hot water operation increases the amount of hot water storage. When the hot water detected by the upper hot water storage temperature sensor 13a has reached the heating lower limit temperature + 5 ° C. or higher (S10), the heating operation is restarted (S11).

As described above, the heating-allowed lower limit temperature is set to 60 ° C. from the start of heating to 60 ° C., the hot water heating terminal 10 is sufficiently warmed, and after heating operation is started and the hot water heating terminal 10 is sufficiently warmed, heating is possible. By lowering the lower limit temperature to a value corresponding to the heating set temperature, the heating operation will not be interrupted despite a sufficient amount of stored hot water for a small heating load as in the past, which is convenient The heating operation can be performed, and at the same time, a sufficient amount of stored hot water can be secured.

In addition, since the lower limit temperature that can be heated is determined according to the preset heating temperature, different effects can be obtained depending on the preset heating temperature. When the preset heating temperature is high, the amount of stored hot water in the hot water storage tank 1 is large, and the lower limit temperature that can be heated. The heating operation can be interrupted at a stage where the amount of heat in the hot water storage tank 1 can be sufficiently secured by reducing the risk of not being able to secure the required amount of hot water supply. When the heating set temperature is low, the hot water storage tank 1 The amount of heat stored in the hot water is small, and by lowering the lower limit temperature at which heating is possible, heating operation can be performed for a long time.

Next, the operation of the second embodiment will be described in detail based on the flowchart shown in FIG. Here, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

When the operation switch 16 for heating operation is turned on (S12), the control device 14 sets the lower limit temperature at which heating is possible to 60 ° C., which is higher than the target forward temperature at the time of startup (S13). And when it is judged that the temperature of the hot water storage tank 1 upper part which the control apparatus 14 detects with the hot water storage temperature sensor 13a is more than the lower limit temperature which can be heated (here 60 degreeC) (S14), heating operation is started. (S15).

When 30 minutes, which is the target prohibition temperature change prohibition time, have elapsed since the start of the heating operation (S16), the target outbound temperature can be changed. The control device 14 sets the lower limit temperature at which heating is possible to the target forward temperature of the heat exchange secondary outlet temperature sensor T4 + 5 ° C. (S17), and continues the heating operation.

Then, when the heating operation is continued and the temperature of the hot water heating terminal 10 rises with time as shown in FIG. 5, the temperature detected by the heat exchange secondary inlet temperature sensor T3 approaches the heating set temperature, and the target The going-out temperature gradually decreases.

Here, when the amount of heat in the hot water storage tank 1 is consumed by heating or hot water supply and the temperature of the upper part of the hot water storage tank 1 becomes lower than the lower limit temperature for heating (S18), the heating operation is interrupted (S19).

At this time, since the temperature detected by the hot water storage temperature sensor 13a in the upper part of the hot water storage tank 1 has increased below the starting temperature, the additional heating operation is performed, and the additional hot water operation increases the amount of hot water storage. When the temperature detected by the upper hot water storage temperature sensor 13a becomes equal to or higher than the lower limit temperature for heating + 10 ° C. (S20), the heating operation is restarted (S21).

As described above, the heating-allowed lower limit temperature is set to 60 ° C. from the start of heating to 60 ° C., the hot water heating terminal 10 is sufficiently warmed, and after heating operation is started and the hot water heating terminal 10 is sufficiently warmed, heating is possible. By lowering the lower limit temperature to a value corresponding to the target going temperature, the heating operation is not interrupted despite the sufficient amount of stored hot water for a small heating load as in the past, which is convenient The heating operation can be performed, and at the same time, a sufficient amount of stored hot water can be secured.

In addition, since the lower limit temperature that can be heated is determined according to the target temperature, the heating operation can be interrupted when the amount of stored hot water in the hot water storage tank 1 is insufficient, thereby reducing the risk of using up the heat in the hot water storage tank 1. Can be operated for a long time. In addition, unlike the first embodiment, the lower limit temperature that can be heated is changed following the target going temperature, so that when the target going temperature suddenly increases due to a sudden change in the weather, etc. The lower limit temperature for heating is increased, and the amount of heat to be secured for hot water supply is increased according to the increase in the amount of heat per unit time required for heating, so that the amount of heat necessary for hot water supply can be sufficiently secured. . In addition, since the amount of heat per unit time required for heating is reduced when the target going temperature decreases, the amount of heat necessary for hot water supply can be secured sufficiently even if the lower limit temperature for heating is lowered and the lower limit for heating is possible. Since the temperature is low, the heating operation can be continued.

In addition, this invention is not limited to 1st Embodiment, It does not prevent changing in the range which does not change a summary, For example, in 1st Embodiment of this invention, the change of the heating minimum temperature limit is Although it is heating setting temperature +10 degreeC set with the remote control 15, it is not limited to heating setting temperature +10 degreeC, You may change if it is temperature higher than heating setting temperature.

In the second embodiment, the lower limit temperature that can be heated is the target forward temperature + 5 ° C., but is not limited to the target forward temperature + 5 ° C., and may be changed to a temperature higher than the target forward temperature. It is.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 4 Heat pump type heating means 5 Heat pump circulation circuit 7 Heating heat exchanger 8 Primary side circulation circuit 9 Primary side circulation pump 10 Hot water heating terminal 11 Secondary side circulation circuit 12 Secondary side circulation pump 13 Hot water storage temperature sensor 14 Control device 15 Remote control T1 Heat exchange primary inlet temperature sensor T2 Heat exchange primary outlet temperature sensor T3 Heat exchange secondary inlet temperature sensor T4 Heat exchange secondary outlet temperature sensor

Claims (3)

A hot water storage tank, a heat pump circulation circuit that heats water from the lower part of the hot water storage tank by a heat pump heating means and returns it to the upper part of the hot water storage tank, and returns from the upper part of the hot water storage tank to the hot water storage tank via a heating heat exchanger A primary side circulation circuit, a hot water heating terminal and a secondary side circulation circuit including the heating heat exchanger, and detecting temperatures of an inlet and an outlet of a heating heat exchanger provided in the primary circulation circuit, respectively Heat exchange primary inlet temperature sensor and heat exchange primary outlet temperature sensor provided, and heat exchange secondary provided respectively for detecting the temperature of the inlet and outlet of the heating heat exchanger provided in the secondary side circulation circuit To detect the temperature in the inlet temperature sensor, the heat exchange secondary outlet sensor, the primary circulation pump of the primary circulation circuit, the secondary circulation pump of the secondary circulation circuit, and the hot water storage tank Hot water storage temperature sensor A controller that controls driving of the primary-side circulation pump and the secondary-side circulation pump; and a remote controller that is capable of setting a heating set temperature. A heat pump hot water storage type hot water supply and heating device characterized in that the heating operation is interrupted when a temperature lower than the lower limit temperature is detected, and the heating lower limit temperature can be changed. The heat pump hot water storage type hot water supply and heating device according to claim 1, wherein the control device changes the lower limit temperature that can be heated based on a heating set temperature set by the remote controller. 2. The heat pump hot water storage type hot water supply and heating apparatus according to claim 1, wherein the control device is configured to change the lower limit temperature capable of heating based on a target going temperature of the heat exchanger secondary side outlet temperature sensor.

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