KR20130118776A - Hot water supply system - Google Patents

Abstract

PURPOSE: A hot water supply system is provided to prevent the durability degradation of a heat pump and to improve energy efficiency by reducing the waste of energy due to the pause and restart of the operation of the heat pump. CONSTITUTION: A hot water supply system comprises a heat pump, a tank, a supply path, and a controller. The controller keeps time information which indicates starting or pausing time for supplying hot water within a predetermined period of time in the past. The controller specifies hot water supply starting time, bathwater preparation staring time, and hot water supply ending time. The controller operates the heat pump at first pump operation time which is ahead of the hot water supply starting time for first predetermined time. The controller operates the heat pump at second pump operation time which is ahead of the bathwater preparation staring time for second predetermined time. The controller pauses the operation of the heat pump at heat pump pausing time which is ahead of the hot water supply ending time for third predetermined time. [Reference numerals] (AA) TW: the measured temperature of a thermister (32); (BB) TW >= 21°C: 20 minutes; (CC) 13°C <= TW < 21°C: 30 minutes; (DD) TW <1 3°C: 45 minutes; (EE) TW >= 21°C: 40 minutes; (FF) 13°C <= TW < 21°C: 50 minutes; (GG) TW < 13°C: 60 minutes; (HH) Amount of hot water supply; (II) Time

Description

Hot water supply system {HOT WATER SUPPLY SYSTEM}

The technology disclosed herein relates to a hot water supply system.

Patent Document 1 discloses a low-temperature type hot water supply apparatus having a heat pump and a low-temperature tank for storing hot water heated by a heat pump. In the low-temperature type hot water supply apparatus of Patent Document 1, control is performed to increase the set value of the remaining amount of hot water (remaining water amount) and the amount of the stopped remaining amount of time in the one hour before (one hour before) I am doing. That is, in this low-temperature type hot water supply apparatus, the time zone during which the boiling operation is frequently performed in the past is learned, and the set value is changed so that boiling is easily performed in the time zone before the boiling operation.

Patent Document 1: Japanese Patent Application Laid-Open No. 2007-183055

In the technique of Patent Document 1, the time zone during which the boiling operation was frequently performed in the past is the time zone during which hot water was frequently operated. In order to store an appropriate amount of hot water in advance in the tank in accordance with the time during which the hot water has been frequently performed in the past, it is necessary to accurately set the set amount of the hot water remaining amount and the stop remaining amount in accordance with each time zone in which the hot water supply is performed. In order to accurately set the set value in accordance with each time zone in which the hot water supply is performed, a large amount of data is required and a large number of calculations must be performed, thereby increasing the processing load.

The present specification provides a hot water supply system capable of storing an appropriate amount of hot water in a tank by relatively simple and convenient control in a unit time of 24 hours (one day).

As a result of intensive studies by the present inventors, it has been found that when a plurality of household life cycles are viewed in units of 24 hours (one day), a predetermined amount of hot water supply (bath water supply) Found that a certain amount of hot water was supplied in the time zone. It has also been found that, in any household, it is unlikely that hot water will be needed until the first hot water supply is made the next day after the last hot water supply.

The hot water supply system disclosed in this specification is made based on the above discovery. The hot water supply system disclosed in the present specification includes a heat pump that absorbs heat from outside air, a tank for storing hot water heated by the heat pump, a supply path for supplying hot water in the tank to a hot water use point, and a controller. The controller stores time information indicating at least one of a time at which hot water supply is started and a time at which hot water supply is terminated in a past predetermined period. The controller is a hot water start time at which the first hot water supply should be started and a time later than the hot water start time in a unit time of 24 hours based on time information, and a predetermined amount of hot water supply starts to the bathtub. Specify the start time of receiving bath water and the end time of hot water supply at which the last hot water supply should be terminated. The controller operates the heat pump at the first heat pump operation time that is the first predetermined time before the start of hot water supply, and operates the heat pump at the second heat pump operation time that is the second predetermined time before the start of bath water reception. The heat pump is stopped at the heat pump stop time that is a time before the end of the hot water supply by a third predetermined time.

In the hot water supply system described above, the heat pump is operated at the first heat pump operation time and the second heat pump operation time to start storing hot water in the tank. Therefore, it is possible to store the amount of hot water required for hot water supply in the tank at the hot water supply start time and the bath water supply start time, which are likely to require a predetermined amount of hot water in each household. Further, in the hot water supply system described above, the heat pump is stopped at the time of stopping the heat pump, so that no more hot water is stored in the tank. Therefore, in each household, it is possible to prevent the excess hot water from being stored in the tank at the hot water finishing time, which is likely to require no hot water thereafter. In the above-described hot water supply system, attention is paid to three times, that is, a hot water supply start time, which is likely to require hot water, a bath water reception start time, and a hot water supply end time, Control is performed so that a suitable amount of hot water is stored in the tank at the time. Therefore, it is not necessary to perform control for all the time zones in which hot water is required as in the conventional case. Therefore, in the hot water supply system described above, it is possible to store an appropriate amount of hot water in the tank by relatively simple and convenient control in a unit time of 24 hours (one day).

1 is a view schematically showing the structure of a hot water supply system of the embodiment
2 is a diagram schematically showing a time zone in which a hot water supply is performed in a specific household
3 is a flow chart showing the first heat pump operation process
4 is a flowchart showing a second heat pump operation process
5 is a flow chart showing a bath-

The main features of the embodiments described below are listed. In addition, the technical elements described below are independent technical elements, and exhibit technological usefulness alone or in various combinations, and the invention is not limited to the combination of claims described in the application.

(Feature 1) The hot water supply system may further comprise a first measuring means for measuring the temperature of the water below the tank. The controller stops the heat pump when the temperature measured by the first measuring means is equal to or higher than the predetermined temperature and activates the heat pump at the second heat pump operating time so that the first measuring means The second predetermined time may be specified so that the measured temperature is lower than the predetermined temperature.

According to the hot water supply system of this configuration, it is possible to prevent the heat pump from being stopped at the start time of receiving the bath water. Therefore, the heat pump can be continuously operated even after the hot water supply to the bath is started. That is, the water can be heated by the heat pump and stored in the tank, and hot water can be supplied to the bathtub. On the other hand, when the temperature of the entire hot water in the tank is equal to or higher than the predetermined temperature (that is, when the heat pump is stopped) at the start time of receiving the bath water, the hot water is supplied to the bath, It is necessary to operate the heat pump again. The hot water supply system of this configuration can suppress frequent stoppage and re-operation of the heat pump. In other words, it is possible to reduce the waste of stoppage and re-operation of the heat pump, thereby increasing the energy efficiency and suppressing the deterioration of the durability of the heat pump.

(Feature 2) The hot water supply system may further include second measuring means for measuring the temperature of at least one of the outside air temperature and the water temperature of the tap water. The controller specifies the short first predetermined time as the temperature measured by the second measuring means becomes higher and specifies the shorter second predetermined time as the temperature measured by the second measuring means becomes higher, The longer the third predetermined time may be determined.

The hot water supply system having this configuration can specify the appropriate predetermined time based on the temperature of at least one of the outside temperature and the water temperature of the tap water. Outside temperature or tap water temperature varies according to season or geographic situation. Therefore, the hot water supply system of this configuration can operate the heat pump at the first heat pump operation time and the second heat pump operation time suitable for the season or geographical situation, and at the same time, The heat pump can be stopped. Therefore, the hot water supply system can store an appropriate amount of hot water in the tank at three times of the hot water supply start time, the bath water reception start time, and the hot water supply end time.

(Example)

1, the hot water supply system 2 according to the present embodiment includes a tank 10, a tank water circulation path 20, a tap water introduction path 30, a supply path 40, a heat pump 50, A burner heating device 60, and a controller 100.

The heat pump 50 is a heat source that absorbs heat from the outside air and heats water in the tank water circulation path 20. The heat pump 50 includes a heat medium circulation path for circulating a heating medium (alternate freon, for example, R410A or the like) not shown, an evaporator for performing heat exchange between the outside air and the heat medium, a compressor A heat exchanger for exchanging heat between the water in the tank water circuit 20 and the high-temperature and high-pressure heat medium, and an expansion valve for reducing the pressure of the heat medium after completion of heat exchange to low temperature and low pressure. In addition, the heat pump 50 is provided with an outside air temperature sensor 52 for measuring the outside air temperature.

The tank 10 stores hot water heated by the heat pump 50. The tank 10 is of a closed type and is covered on the outside by a heat insulating material. In the tank 10, water is stored up to full water. In this embodiment, the capacity of the tank 10 is 100L. Thermistors 12, 14, 16 and 18 are mounted on the tank 10 at predetermined intervals in the height direction of the tank 10. [ Each thermistor 12, 14, 16, 18 measures the temperature of the water at its installation location. For example, each thermistor 12, 14, 16, 18 measures the temperature of water at locations 6L, 12L, 30L, 50L from the top of tank 10, respectively.

The tank water circulation passage 20 has an upstream end connected to the lower portion of the tank 10 and a downstream end connected to the upper portion of the tank 10. A circulation pump 22 is interposed in the tank water circuit 20. The circulation pump 22 sends the water in the tank water circuit 20 from the upstream side to the downstream side. In addition, the tank water circuit 20 passes through a heat exchanger (not shown) of the heat pump 50. Therefore, when the heat pump 50 is operated, the water in the tank water circuit 20 is heated by the heat exchanger of the heat pump 50. Therefore, when the circulation pump 22 and the heat pump 50 are operated, the water below the tank 10 is heated by the heat pump 50, and the heated water is returned to the upper portion of the tank 10. That is, the tank water circuit (20) is a channel for accumulating heat in the tank (10). A thermistor 24 is disposed on the upstream side of the heat pump 50 of the tank water circuit 20. The thermistor 24 measures the temperature of the water that is drawn from the bottom of the tank 10 and passes through the heat pump 50.

The tap conduit 30 is connected at its upstream end to the tap water supply source 31. A thermistor (32) is interposed in the tap water introduction path (30). The thermistor 32 measures the temperature of tap water. The downstream side of the tap water introduction path 30 is branched into the first introduction path 30a and the second introduction path 30b. The downstream end of the first introduction path 30a is connected to the lower portion of the tank 10. The downstream end of the second introduction path 30b is connected in the middle of the supply path 40 to be described later. A mixing valve 42 is provided at a connecting portion between the downstream end of the second introduction passage 30b and the supply passage 40. [ The mixing valve 42 adjusts the amount by which the water in the second introduction path 30b is mixed with the hot water flowing in the supply path 40. [

The supply passage 40 has an upstream end connected to the upper portion of the tank 10. As described above, the second introduction path 30b of the tap water introduction path 30 is connected to the middle of the supply path 40, and the mixing valve 42 is provided at the connection portion. The burner heating device 60 is disposed in the supply passage 40 on the downstream side of the connection portion with the second introduction passage 30b. A thermistor 44 is interposed in the supply path 40 on the downstream side of the burner heating device 60. The thermistor 44 measures the temperature of the supplied hot water. The burner heating device 60 heats the water in the supply path 40 such that the temperature of the hot water measured by the thermistor 44 coincides with the set temperature of the hot water supply. The downstream end of the supply path 40 is connected to a hot water utilization site (e.g., kitchen, bathtub, etc.).

The controller 100 is electrically connected to each component and controls the operation of each component.

Next, the operation of the hot water supply system 2 of the present embodiment will be described. The hot water supply system 2 can perform the heat accumulation operation and the hot water supply operation. Each operation will be described below.

(Heat storage operation)

The heat storage operation is an operation of heating the water in the tank 10 by the heat generated by the heat pump 50. When the execution of the heat accumulation operation is instructed by the controller 100, the heat pump 50 is operated and the circulation pump 22 is rotated. When the circulation pump 22 rotates, the water in the tank 10 circulates in the tank water circulation passage 20. That is, water present in the lower portion of the tank 10 is introduced into the tank water circulation passage 20, heated by the heat of the heating medium when the introduced water passes through the heat exchanger in the heat pump 50, (10). Thereby, high-temperature water is stored in the tank (10). A high-temperature water layer is formed on the upper part of the tank 10, and a low-temperature water layer is formed on the lower part.

(Hot water operation)

The hot water supply operation is an operation for supplying water in the tank 10 to hot water use sites. In addition, the hot water supply operation in the case where the hot water use place is a bathtub is hereinafter referred to as &quot; bath water receiving operation &quot;. The hot water supply operation can be executed even during the above-described heat storage operation. The controller 100 flows tap water into the lower portion of the tank 10 from the tap water introduction path 30 (first introduction path 30a) by the water pressure from the tap water supply source 31 . At the same time, the hot water in the upper part of the tank 10 is supplied to the hot water use place through the supply path 40.

When the temperature of the water supplied from the tank 10 to the supply path 40 (that is, the temperature measured by the thermistor 12) is higher than the hot water setting temperature, the controller 100 opens the mixing valve 42, The tap water is introduced into the supply path 40 from the introduction path 30b. Therefore, the water supplied from the tank 10 and the tap water supplied from the second introduction path 30b are mixed in the supply path 40. [ The controller 100 adjusts the opening degree of the mixing valve 42 so that the temperature of the water supplied to the hot water use position coincides with the hot water setting temperature. On the other hand, the controller 100 operates the burner heating device 60 when the temperature of the water supplied from the tank 10 to the supply path 40 is lower than the hot water setting temperature. Therefore, the water passing through the supply path 40 is heated by the burner heating device 60. [ The controller 100 controls the output of the burner heating device 60 such that the temperature of the water supplied to the hot water use point coincides with the hot water setting temperature.

(Tendency of hot water supply in certain generation)

Next, referring to Fig. 2, a trend of hot water supply in a specific household when a life cycle of a specific household is viewed in units of 24 hours (one day) will be described. Fig. 2 is a diagram schematically showing a time period during which hot water is performed in a certain household for a certain day. In addition, in the present embodiment, the controller 100 sets the 24-hour clock at 2:00 as the unit time for specifying one day.

In a certain household, for example, hot water supply is first performed at 6:00 to 7:00 (at 6:00 in the example of FIG. 2). The first hot water supply is, for example, hot water for breakfast preparation and toiletries. In the first hot water supply, hot water of about 5L to 20L is supplied. In a particular household, for example, a second hot water supply is performed from 11:00 to 12:00 (11:00 in the example of FIG. 2). The second hot water is for example hot water for lunch preparation. In the second hot water supply, hot water of about 5L to 20L is supplied. In a particular household, for example, a third hot water supply is performed at 20:00 (20:00 in the example of FIG. 2). The third hot water bath is the driving of the bathtub. In the present embodiment, the specific household is set in advance to start the bath water receiving operation at 20:00 every day. In the operation of receiving bath water, hot water of about 150L to 180L is supplied. In a certain household, for example, the final hot water is performed from 23:00 to 0:00 (approximately 23:00 in the example of FIG. 2). The last hot water is, for example, hot water for feces. In the last hot water supply, about 5L to 10L of hot water is supplied. The last hot water supply ends at about 0:00.

In the present embodiment, the controller 100 stores time information indicating the time at which the hot water supply is started, the time at which the hot water supply has ended, and the supply amount information indicating the amount of the supplied hot water each time the hot water is performed in the specified generation. The controller 100 stores the one-day time information and the supply amount information as the one-day operation history of the specific household. In the present embodiment, the controller 100 stores the past 7-day operation history of a specific generation.

(The processing that the controller 100 performs every 24 hours)

Next, a description will be given of a process in which the controller 100 executes every 24 hours (every time the time reaches 2:00). As described above, in the present embodiment, the controller 100 stores the past 7-day operation history of a specific generation. Therefore, the controller 100 erases the operation history of 8 days before every 24 hours, and newly stores the operation history of the previous day.

Next, the controller 100 specifies the earliest time of the first hot water supply in the past seven days from the past seven days of operation history of the specific household. Hereinafter, this time is referred to as &quot; hot water supply start time (S1) &quot;. For example, the controller 100 specifies 6:00 as the hot water supply start time (S1) (see FIG. 2).

In addition, the controller 100 specifies the earliest time of the bath water receiving operation start time in the past seven days from the past seven days driving history of the specific generation. Hereinafter, this time is referred to as &quot; bath water receiving start time (B1) &quot;. As described above, in the present embodiment, the specific household is set in advance to start the bath water receiving operation at 20:00 every day. For example, the controller 100 specifies 20:00 as the bath start time (B1) (see FIG. 2).

Further, the controller 100 specifies the latest time of the last hot water supply in the past seven days from the past seven days of operation history of the specific household. Hereinafter, this time is referred to as "hot water supply end time (G1)". For example, the controller 100 specifies 0:00 as the hot water supply end time G1 (see Fig. 2).

The controller 100 determines the first predetermined time?, The second predetermined time?, And the third predetermined time? Based on the temperature TW measured by the thermistor 32 (?).

As shown in Fig. 2, when the temperature TW is equal to or higher than 21 占 폚, the controller 100 specifies "20 minutes" as the first predetermined time?. When the temperature TW is not less than 13 占 폚 and less than 21 占 폚, the controller 100 specifies "30 minutes" as the first predetermined time?. When the temperature TW is less than 13 占 폚, the controller 100 specifies "45 minutes" as the first predetermined time?. The controller 100 specifies a shorter time as the first predetermined time? As the temperature TW is higher.

Similarly, as shown in Fig. 2, when the temperature TW is equal to or higher than 21 占 폚, the controller 100 specifies "40 minutes" as the second predetermined time?. If the temperature TW is not less than 13 占 폚 and less than 21 占 폚, the controller 100 specifies "50 minutes" as the second predetermined time?. When the temperature TW is less than 13 占 폚, the controller 100 specifies "60 minutes" as the second predetermined time?. The controller 100 specifies a shorter time as the second predetermined time? As the temperature TW is higher.

Similarly, as shown in Fig. 2, when the temperature TW is equal to or higher than 21 占 폚, the controller 100 specifies "80 minutes" as the third predetermined time?. When the temperature TW is 13 ° C or more and less than 21 ° C, the controller 100 specifies "50 minutes" as the third predetermined time γ. When the temperature TW is less than 13 占 폚, the controller 100 specifies "40 minutes" as the third predetermined time?. The controller 100 specifies a longer time as the third predetermined time? As the temperature TW is higher.

Next, the controller 100 specifies the first heat pump operation time S0 which is the time before the first predetermined time? Specified from the hot water supply start time S1. In the present embodiment, when the first heat pump operation time S0 comes, the controller 100 starts the first heat pump operation processing (see FIG. 3) to be described later.

In addition, the controller 100 specifies the second heat pump operation time B0 which is the time before the second predetermined time? Specified from the bath water reception start time B1. In the present embodiment, when the second heat pump operation time B0 comes, the controller 100 starts the second heat pump operation processing (see Fig. 4) described later.

Further, the controller 100 specifies the heat pump stop time G0 which is the time before the third predetermined time? Specified from the hot water supply end time G1. In the present embodiment, when the heat pump stop time G0 comes, the controller 100 starts the heat pump stop processing to be described later.

(First heat pump operation process)

Fig. 3 is a flowchart showing the contents of the first heat pump operation process executed by the controller 100. Fig. As described above, when the first heat pump operation time S0 comes, the controller 100 starts the processing of Fig. First, in S10, the controller 100 determines whether or not the heat pump 50 is operating. If the heat pump 50 is operating, the controller 100 determines YES in S10, skips S12, and proceeds to S14. On the other hand, when the heat pump 50 is not operating, the controller 100 determines NO at S10 and proceeds to S12.

In S12, the controller 100 determines whether the temperature measured by the thermistor 16 (i.e., the water temperature at the position 30L from the top of the tank 10) is higher than a predetermined threshold value TA.

In the present embodiment, the predetermined threshold value TA is the &quot; boiling set temperature -10 DEG C &quot;. The boiling set temperature is, for example, 47 占 폚. Therefore, the predetermined threshold value TA is, for example, 37 占 폚. When it is judged YES in S12, the water temperature at the position of 30L from at least the upper part of the tank 10 is higher than the threshold value TA (for example, 37 DEG C). As described above, a high-temperature water layer is formed on the upper portion of the tank 10, and a low-temperature water layer is formed on the lower portion. Therefore, when it is determined as YES in S12, hot water of a high temperature near the boiling set temperature (for example, 47 DEG C) is stored between the 30L position of the tank 10 and the upper portion of the tank. That is, when it is determined as YES in S12, it means that hot water of an amount (about 5L to 20L) required for the first hot water supply to be performed at the time near the hot water supply start time S1 is stored in the tank 10. If YES is determined in S12, the process proceeds to S18. On the other hand, if NO is determined in S12, the process proceeds to S14.

The controller 100 determines that the temperature measured by the thermistor 24 (that is, the temperature of the water that is drawn from the lower portion of the tank 10 and passes through the heat pump 50) is lower than the predetermined threshold value TB It is judged whether or not it is high.

In the present embodiment, the predetermined threshold value TB is the &quot; boiling set temperature -5 deg. C &quot;. The boiling set temperature is, for example, 47 占 폚. Therefore, the predetermined threshold value TB is 42 deg. C, for example. If YES in S14, hot water having a temperature higher than the threshold value TB (for example, 42 DEG C) is stored in the lower portion of the tank 10. [ That is, almost all the hot water in the tank 10, which is close to the boiling set temperature, is stored. Hereinafter, such a state of the tank 10 may be referred to as &quot; full state &quot;. If YES in S14, the process proceeds to S18. On the other hand, if NO is determined in S14, the process proceeds to S16.

In S16, the controller 100 operates the heat pump 50. [ Further, the controller 100 rotates the circulation pump 22. That is, the controller 100 starts the above-described heat storage operation. Thereby, the water present in the lower part of the tank 10 is introduced into the tank water circulation passage 20, the introduced water is heated by the heat pump 50, and the heated water is returned to the upper part of the tank 10 Loses. Thereby, high-temperature water is stored in the tank (10). When the heat pump 50 and the circulation pump 22 are already operating at the time of S16, the controller 100 continues to operate the heat pump 50 and the circulation pump 22. When S16 is finished, the process returns to S10, and the controller 100 determines whether or not the heat pump 50 is operating. In this case, the controller 100 determines YES in S10 and proceeds to S14. That is, after the heat pump 50 is operated in S16, the controller 100 determines that the temperature measured by the thermistor 24 becomes higher than the predetermined threshold value TB (i.e., when the tank 10 is in a full- ). When the temperature measured by the thermistor 24 becomes higher than the predetermined threshold value TB (YES in S14), the process proceeds to S18.

In S18, the controller 100 stops the heat pump 50 and the circulation pump 22. As described above, when it is determined YES in S12, hot water of an amount (about 5L to 20L) necessary for the first hot water supply is already stored in the tank 10. When the result of the determination in S14 is YES, the tank 10 is in an enlarged state, and hot water of an amount (about 5L to 20L) necessary for the first hot water supply is naturally stored in the tank 10. When S18 is finished, the process returns to S10 and the controller 100 determines whether or not the heat pump 50 is operating. In this case, the controller 100 determines NO at S10 and proceeds to S12. That is, after the heat pump 50 is stopped in S18, the controller 100 determines that the temperature measured by the thermistor 16 is equal to or less than the predetermined threshold value TA (that is, NO in S12) Lt; / RTI &gt; When the temperature measured by the thermistor 16 becomes equal to or less than the predetermined threshold value TA (NO at S12), the process proceeds to S14 again.

When the first hot water supply operation is performed at the time near the hot water supply start time S1 after the start of the first heat pump operation process of Fig. 3, the hot water in the upper part of the tank 10 is supplied to the hot water utilization site . As described above, in the hot water supply system 2 of the present embodiment, hot water necessary for hot water supply can be stored in the tank 10 at the hot water supply start time S1. That is, by operating the heat pump 50 only during that time, the first predetermined time? Is the time at which the hot water necessary for hot water supply can be stored in the tank 10 at the time of the hot water supply start time S1 to be.

(Second heat pump operation process)

Fig. 4 is a flowchart showing the contents of the second heat pump operation process executed by the controller 100. Fig. As described above, when the second heat pump operation time B0 comes, the controller 100 starts the processing of Fig. First, in S30, the controller 100 determines whether or not the temperature measured by the thermistor 24 (that is, the temperature of the water derived from the lower portion of the tank 10 and passing through the heat pump 50) TB) (i.e., whether or not the tank 10 is in a full state). If YES is determined in S30, the process proceeds to S38. On the other hand, if NO is determined in S30, the process proceeds to S32.

In S32, the controller 100 operates the heat pump 50. [ Further, the controller 100 rotates the circulation pump 22. That is, the controller 100 starts the above-described heat storage operation. When the heat pump 50 and the circulation pump 22 are already operating at the time of S32, the controller 100 continues to operate the heat pump 50 and the circulation pump 22. When S32 ends, the process proceeds to S34.

On the other hand, in S38, the heat pump 50 and the circulation pump 22 are stopped. As described above, when it is determined as YES in S30, the tank 10 is in a state of being enlarged. Therefore, there is no need to operate the heat pump 50 and the circulation pump 22 any more. When S38 ends, the process proceeds to S34.

In S34, the controller 100 determines whether or not the bath water receiving start time B1 has arrived. If YES is determined in S34, the process proceeds to S36 to start the bath water receiving process (see Fig. 4). On the other hand, if NO in S34, the process returns to S30.

In the present embodiment, when the second heat pump operation process of FIG. 4 is started, if the hot water of the boiling set temperature is not sufficiently stored in the tank 10 (for example, The bath water supply start time B1 is reached (YES in S34) before the tank 10 becomes full, after the heat pump 50 is operated in S32 described above. That is, in this embodiment, when the heat pump 50 is operated at the second heat pump operation time B0 (S32), the controller 100 determines that the thermistor 24 The second predetermined time? Is specified so that the temperature is less than the predetermined threshold value TB.

(Treatment of receiving bath water)

As described above, when the bath water receiving start time (B1) comes, the controller 100 starts the bath water receiving process in S36. 5 is a flow chart showing contents of the bath water receiving process. In the present embodiment, an explanation will be given of an example in which the bath water receiving process is automatically started when the bath water receiving start time B1 comes. However, in the modification example, when a predetermined bath water receiving start operation is performed by the user, .

In S50 of Fig. 5, the controller 100 starts the bath water receiving operation. That is, the controller 100 opens the hot water supply of the bathtub and starts the hot water supply to the bathtub. Then, in S52, the controller 100 determines whether or not the heat pump 50 is operating. As described above, the heat pump 50 continues to operate when the tank 10 is not in the full-scale state at the time when the bath water supply start time B1 has come. In this case, the controller 100 determines YES in S52 and proceeds to S58. On the other hand, when the bath water receiving start time B1 is reached, the heat pump 50 is stopped when the tank 10 is in a full-scale state. In this case, the controller 100 determines NO in S52 and proceeds to S54.

In S54, the controller 100 monitors that the temperature measured by the thermistor 16 becomes equal to or smaller than a predetermined threshold value TA. If YES in S54, the process proceeds to S56. If YES in S54, it means that the amount of hot water (hot water having a temperature higher than the threshold value TA) stored in the tank 10 is reduced to the remaining 30 L or less as a result of the bath water receiving operation. In S56, the controller 100 activates the heat pump 50 and rotates the circulation pump 22.

In S58, the controller 100 monitors that the temperature measured by the thermistor 12 (that is, the water temperature at the 6L position from the upper portion of the tank 10) is equal to or lower than the hot water setting temperature. If YES in S58, it means that the amount of hot water (hot water having a temperature higher than the set hot water supply temperature) stored in the tank 10 has decreased to the remaining 6 L or less. &Quot; In this embodiment, 150 L to 180 L of hot water is required in the bath water receiving operation. As described above, in the present embodiment, since the capacity of the tank 10 is 100L, the bath water shortage state (YES in S58) necessarily occurs during the bath water receiving operation. When it is judged YES in S58 (that is, in the case of the bath water shortage state), the flow proceeds to S60.

In S60, the controller 100 operates the burner heating device 60. [ Also in this case, the controller 100 continues to operate the heat pump 50 and the circulation pump 22. As a result, hot water heated by the heat pump 50 and the burner heating device 60 is supplied to the bath.

Subsequently, in S62, the controller 100 monitors completion of the bath water receiving operation. When the hot water of a predetermined amount (for example, 150 L) is supplied to the bathtub, the controller 100 determines YES in S62 and proceeds to S64.

In S64, the controller 100 stops the burner heating device 60 operated in S60. Also in this case, the controller 100 continuously operates the heat pump 50 and the circulation pump 22 for a predetermined time. When S64 is finished, the bath water receiving process of Fig. 5 ends. At the same time, the process of Fig. As described above, in the hot water supply system 2 of this embodiment, it is possible to store a part of hot water in an amount necessary for receiving bath water in the tank 10 at the bath water receiving start time (B1). That is, the second predetermined time? Is the time at which the necessary amount of hot water can be stored in the tank 10 at the time point of starting the bath water receiving start time B1 by activating the heat pump 50 only during that time .

As described above, when the heat pump 50 is operated at the second heat pump operation time B0 (S32), the controller 100 determines that the thermistor 24 The second predetermined time? Is set so that the temperature at which the temperature is lower than the predetermined threshold value TB. Therefore, if the tank 10 is not in a full-up state at the time when the start time (B1) of bath water arrival is reached, the heat pump 50 is continuously operated even after the supply of hot water to the bath (S50 in FIG. 5) (YES in S52 of Fig. 5). In this case, hot water can be supplied to the bath while heating the water by the heat pump 50 and storing it in the tank 10. [ On the other hand, when the heat pump 50 is stopped at the bath water receiving start time B1 (NO in S52 of FIG. 5), it takes a long time to operate the heat pump 50 again S56). 5), the heat pump 50 is stopped at the bath water receiving start time B1 (step S52 of Fig. 5), and the heat pump 50 is stopped It is possible to suppress frequent stoppage and re-operation of the heat pump 50 as compared with the case where the heat pump 50 is present (NO in S52 of FIG. 5). In other words, it is possible to reduce the waste caused by stopping and restarting the heat pump 50, thereby increasing the energy efficiency and suppressing the deterioration of the durability of the heat pump 50.

(Heat pump stop processing)

When the heat pump stop time G0 comes, the controller 100 starts the heat pump stop process (not shown). That is, the controller 100 stops the heat pump 50 when the heat pump 50 is operating at the time point of the heat pump stop time (G0). When the heat pump 50 is not operating, the controller 100 stops the heat pump 50 as it is. The controller 100 does not operate the heat pump 50 until the next day when the heat pump 50 is stopped at the heat pump stop time G0. Thereafter, the last hot water supply operation is finished at the time near the hot water supply end time (G1). Therefore, in the hot water supply system 2 of the present embodiment, excessive hot water can not be stored in the tank 10 at the hot water supply end time G1. That is, the third predetermined time? Does not operate the heat pump 50 during the time, so that the time at which the excess hot water can not be stored in the tank 10 at the time of the hot water supply end time G1 to be.

The configuration and operation of the hot water supply system 2 of the present embodiment have been described above. As described above, the hot water supply system (2) of the present embodiment is configured such that the hot water supply start time and the bath water supply start time, which are likely to require hot water in a specific household, and the hot water supply start time The end time is paid attention to three times, and control is performed so that an appropriate amount of hot water is stored in the tank at these three times. Therefore, the hot water supply system 2 of the present embodiment does not need to perform control for all the time zones in which hot water is required, as in the prior art. Therefore, in the hot water supply system 2 described above, it is possible to store an appropriate amount of hot water in the tank by relatively simple and convenient control in a unit time of 24 hours (one day).

As described above, the hot water supply system 2 of the present embodiment is configured such that the first predetermined time?, The second predetermined time?, And the second predetermined time? Are determined based on the temperature TW measured by the thermistor 32 (?), and the third predetermined time (?). Water temperature of tap water changes according to season or geographical situation. For example, when the water temperature of the tap water is lowered (for example, in winter), it is necessary to operate the heat pump 50 for a relatively long time in order to store the hot water required for hot water supply to the tank 10. The hot water supply system 2 of the present embodiment can specify the relatively long first predetermined time? And the second predetermined time? When the temperature TW measured by the thermistor 32 is low. Similarly, when the water temperature of the tap water is lowered, it is expected that the heating amount of the hot water required at the hot water finishing end time (G1) is larger than that when the tap water temperature is high. The hot water supply system 2 of the present embodiment can specify the relatively short third predetermined time? When the temperature TW measured by the thermistor 32 is low.

Conversely, when the water temperature of the tap water becomes high (for example, in summer), the heat pump 50 may be operated for a relatively short period of time in order to store the hot water required for hot water supply to the tank 10. The hot water supply system 2 of the present embodiment can specify the relatively short first predetermined time? And the second predetermined time? When the temperature TW measured by the thermistor 32 is high. Similarly, when the water temperature of the tap water is increased, it is expected that the heating amount of the hot water required at the hot water finishing end time (G1) is smaller than when the water temperature of the tap water is low. The hot water supply system 2 of the present embodiment can specify the relatively long third predetermined time? When the temperature TW measured by the thermistor 32 is high.

As described above, the hot water supply system 2 of this embodiment can appropriately specify the first predetermined time?, The second predetermined time?, And the third predetermined time ?. Therefore, the hot water supply system 2 of the present embodiment can operate the heat pump 50 at the first heat pump operation time S0 and the second heat pump operation time B0 that are suitable for season and geographical conditions In addition, the heat pump 50 can be stopped at the heat pump stop time G0 suitable for season or geographical situation. Therefore, the hot water supply system 2 can store an appropriate amount of hot water in the tank 10 at three times of the hot water supply start time S1, the bath water supply start time B1, and the hot water supply end time G1 .

The embodiments have been described in detail above, but these are merely examples and do not limit the claims. The technology described in the claims includes various modifications and changes of the specific examples exemplified above.

(Modification 1) The controller 100 may specify the average time at which hot water supply was first started for the past seven days from the past seven days of operation history of a specific household as the hot water supply start timing S1. Similarly, the controller 100 may specify the average time of starting the bath water reception in the past 7 days as the bath water reception start time (B1) from the past 7-day driving history of the specific generation. Further, the controller 100 may specify the average time of the last time the hot water supply operation ended at the past seven days from the past seven days of operation history of the specific generation as the hot water supply end time G1.

(Modification 2) The controller 100 is not limited to the above-described method, but may specify the first predetermined time? By arbitrary method as long as the temperature TW is specified to be shorter . Therefore, for example, the controller 100 may calculate the first predetermined time? By performing a predetermined calculation using the temperature TW. Likewise, the controller 100 may specify the second predetermined time? By an arbitrary method as long as the temperature TW specifies the shorter time. Further, the controller 100 may specify the third predetermined time? By an arbitrary method, as long as the temperature TW is specified to be longer.

(Modification 3) The controller 100 uses the first predetermined time α and the second predetermined time β based on the outside air temperature measured by the outside air temperature sensor 52 instead of the water temperature TW measured by the thermistor 32. ), The third predetermined time γ may be specified. In addition, the controller 100 uses the first predetermined time α, the second predetermined time β, and the third predetermined time (based on the water temperature measured by the thermistor 32 and the outside temperature measured by the outside air temperature sensor 52). γ) may be specified.

2 - hot water system 10 - tank
12 - Thermistor 14 - Thermistor
16 - Thermistor 18 - Thermistor
20 - tank water circulation passage 22 - circulation pump
24 - Thermistor 30 - Tap water introduction path
30a - First introduction path 30b - Second introduction path
31 - Tap water source 32 - Thermistor
40 - Supply line 42 - Mixing valve
44 - Thermistor 50 - Heat pump
52-Outside temperature sensor 60-Burner heating device
100 - controller

Claims (3)

As a hot water supply system,
A heat pump that absorbs heat from outside air,
A tank for storing hot water heated by the heat pump,
A supply path for supplying the hot water in the tank to the hot water utilization site,
With a controller,
The controller
Time information indicating at least one of a time at which hot water supply is started and a time at which hot water supply is ended, in a past predetermined period of time;
The hot water supply start time at which the first hot water supply should be started and the time later than the hot water supply start time in a unit time of 24 hours based on the time information, and a predetermined amount of hot water supply should be started in the bathtub. Specify the start time of receiving the bath water and the end time of the hot water supply at which the last hot water supply should be terminated.
The heat pump is operated at the first heat pump operation time, which is the time before the hot water supply start time by the first predetermined time,
The heat pump is operated at the second heat pump operation time which is the time before the bath water receiving start time by the second predetermined time,
The hot water supply system which stops a heat pump at the heat pump stop time which is 3rd predetermined time before a hot water supply end time.
The method according to claim 1,
Further comprising first measuring means for measuring the temperature of the water under the tank,
The controller,
The heat pump is stopped when the temperature measured by the first measuring means is equal to or higher than the predetermined temperature,
And the second predetermined time is specified so that the temperature measured by the first measuring means is less than the predetermined temperature at the starting time of the bath water supply by operating the heat pump at the second heat pump operation time.
The method according to claim 1 or 2,
And a second measuring means for measuring the temperature of at least one of the outside air temperature and the water temperature of the tap water.
The controller,
A shorter first predetermined time is specified as the temperature measured by the second measuring means is higher,
The shorter second predetermined time is specified as the temperature measured by the second measuring means is higher,
And specifies a longer third predetermined time as the temperature measured by the second measuring means becomes higher.

Images