KR20130118266A - Storage type hot water supply device - Google Patents

Abstract

PURPOSE: A hot water storage type hot water supply device is provided to rapidly supply hot water in a target hot water temperature from a tapping pipe by operating auxiliary heat source units although hot water is used up in a hot water tank in heating prohibition time. CONSTITUTION: A hot water storage type hot water supply device (1) comprises a hot water storage tank (11), a water supply pipe (12), a tank heating unit, an auxiliary heat source unit, a heating prohibition time setting unit (123), a tank heating control unit (124). The auxiliary heat source unit heats hot water to a target hot water temperature when the temperature of hot water flowing in a tapping pipe is lower than the predetermined target hot water temperature. The heating prohibition time setting unit prohibits the operation of the tank heating unit and sets the heating prohibition time during daytime according to predetermined conditions for increasing electricity consumption by a power conditioner. The tank heating control unit prohibits the operation of the tank heating unit in the heating prohibition time setting unit. [Reference numerals] (121) Data information acquiring unit; (122) Weather information acquiring unit; (123) Heating prohibition time setting unit; (124) Tank heating control unit; (125) Temperature control unit; (170) Home appliances; (181) Information server; (AA) Hot water; (BB) Water

Description

{STORAGE TYPE HOT WATER SUPPLY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a low-temperature type hot water supply apparatus for heating hot water in a storage tank using power supplied from a solar power generator and a power conditioner to which commercial power is input.

2. Description of the Related Art Conventionally, a low-temperature type hot water supply apparatus for operating a heat pump for heating hot water in a storage tank using electric power by solar power generation has been proposed (see, for example, Patent Documents 1 and 2).

In the low-temperature type hot water supply system described in Patent Document 1, when the amount of electric power generated by solar power generation is equal to or greater than a predetermined value, the heat pump is operated by using the power generated by solar power generation to heat the hot water in the storage tank.

In the low-temperature type hot water supply system described in Patent Document 2, the daylight saving time of the next day extracted based on the weather prediction information is compared with the set time, and when the daylight saving time of the next day is longer than the set time, The boiling water in the storage tank is boiled by operating the heat pump, and when the daylight time of the next day is shorter than the set time, the heat pump is operated by the nighttime power to boil the boiled water in the storage tank.

Patent Document 1: JP-A-2004-271164 Patent Document 2: JP-A-2008-2702

In a house provided with a photovoltaic power generation device, when the amount of power generated by solar power generation exceeds the total power consumption of the house, surplus power surplus can be sold to the power supplier. In this case, since the selling unit price is higher than the purchase unit price of the commercial power, the user intends to increase the amount of power sold by suppressing the power consumption of the house when the solar power is generated.

However, in the above-described Patent Documents 1 and 2, when the solar power is being generated, the heat pump is actively actuated to use electric power by solar power generation. If the total power consumption of the house increases due to the operation of the heat pump, there is a problem that the amount of sales of the electric power due to the solar power generation is reduced against the user's intention.

On the other hand, if the operation of the heat pump is unconditionally restricted, it is impossible to effectively use the low-temperature type hot water supply apparatus having a high energy efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a low-temperature type hot water supply apparatus which suppresses the limitation of boiling water in a storage tank while promoting sales of electric power by solar power generation.

The present invention has been made in order to achieve the above object, and a low-temperature type hot water supply apparatus of the present invention is a low-temperature type hot water supply apparatus which is connected to a photovoltaic power generation apparatus, a commercial power supply line, and an electric load so that the power generation amount of the photovoltaic power generation device When the amount of electric power generated by the photovoltaic power generation device is less than the electric power consumption of the electric load, the electric power supplied from the power conditioner for purchasing the insufficient electric power is used As a low-temperature type hot water supply apparatus,

A storage tank,

A water supply pipe connected to the storage tank for supplying water to the storage tank,

A tank heating unit which is the electric load operated by the power supplied from the power conditioner and heats boiled water in the storage tank,

A hot water tank connected to the storage tank and supplied with hot water from the storage tank,

An auxiliary heat source installed in the middle of the outlet pipe for heating hot water to a target hot water temperature when the temperature of the hot water flowing through the outlet pipe is lower than a predetermined target hot water temperature,

A heating prohibition target time zone setting unit for prohibiting the operation of the tank heating unit and setting a time zone for prohibition of heating which is a daytime zone for increasing the amount of sales of electric power by the power conditioner according to a predetermined condition;

And a tank heating control unit for prohibiting the operation of the tank heating unit in the heating prohibited time zone (first invention).

Moreover, in 1st invention,

And a date information acquisition unit for acquiring date information,

And the predetermined condition is a month to which the current date acquired by the date information acquisition unit belongs (the second invention).

Moreover, in 1st invention,

And a weather information acquisition unit for acquiring weather information,

And the predetermined condition is a weather forecast based on the weather information acquired by the weather information acquisition unit (the third invention).

Moreover, in 1st invention,

And a manual operation unit for accepting a setting instruction of the time zone to prohibit the heating by the user's operation,

And the predetermined condition is an instruction by the manual operation unit (the fourth invention).

In any one of the first to fourth aspects of the present invention,

The tank heating control section monitors the power generation amount of the solar power generation device during the heating prohibited time zone and prohibits the operation of the tank heating section only when the power generation amount of the solar power generation device is equal to or larger than a predetermined power generation amount limit value (Fifth invention).

In the fifth invention,

And the total power consumption of the electric loads other than the tank heating portion is set as the power generation amount threshold (sixth invention).

Further, in any one of the first to sixth aspects of the present invention,

A radiation amount sensor for detecting a radiation amount,

The tank heating control section monitors the irradiation amount detected by the irradiation amount sensor in the heating inhibition target time zone and prohibits the operation of the tank heating section only when the irradiation amount is equal to or larger than a predetermined irradiation amount limit value.

According to the first aspect of the invention, the heating prohibition time zone is set according to the predetermined condition by the heating prohibition time zone setting unit, and the operation of the tank heating unit during the heating inhibition time zone is prohibited by the tank heating control unit do. Therefore, by setting the predetermined condition in accordance with the power generating condition of the solar power generator, the use condition of the electric load operated by the power conditioner, and the like, The restriction of the boiling water of the boiled water in the storage tank can be suppressed. In addition, even if hot water is consumed in the storage tank during the heating prohibited time zone, hot water supply from the hot water supply pipe at the target hot water temperature can be continued by the operation of the auxiliary heat source.

According to the second invention, it is possible to assume a time zone in which the solar radiation amount increases in the day, by the month in which the current date belongs. Therefore, by setting the time zone in which the solar irradiation amount is large according to the month to which the current date belongs, the heating prohibition target time period setting section can promote the sales of the generated power by the solar power generation device have. In addition, when the amount of solar radiation other than the heating prohibited time zone is small and the amount of electricity generated by the solar power generator is low, the tank heating unit can be operated to effectively boil the boiled water in the storage tank.

According to the third invention, it is possible to predict a time zone (such as a clear sky time zone) in which the amount of solar radiation per day increases due to the weather forecast based on weather information. Therefore, the heating prohibition target time period setting unit can promote the sales of the generated power by the solar power generation device by setting the time zone in which the irradiation amount is large according to the predicted weather to the heating prohibited target time period. In addition, in the time zone in which the amount of solar radiation other than the heating inhibition target time period is small and the amount of power generation by the solar power generation device is small, the tank heating section can be operated to efficiently boil the hot water in the storage tank.

According to the fourth aspect of the present invention, the user can arbitrarily set the heating prohibition target time zone in accordance with the use situation of his or her hot water by the manual operation unit. Therefore, for example, in the case of going out to the middle of the day, all of the daytime time zone can be set as the heating inhibition target time zone, and sales of the generated power by the solar power generation device can be promoted. In addition, it is possible to solve the supply shortage of the commercial power by setting the time zone in which the supply shortage of the commercial power is expected to be set as the prohibition target time zone and selling the electric power.

According to the fifth aspect of the present invention, when the power generation amount of the solar power generation device is small and an increase in the sales amount of electric power can not be expected even if the operation of the tank heating part is prohibited, the operation of the tank heating part is not prohibited, By boiling the hot water in the tank, the operation of the auxiliary heat source can be suppressed and efficient hot water supply can be performed.

According to the sixth aspect of the present invention, when it is apparent that the power generation amount of the solar power generation device is less than the total power consumption of the electric loads other than the tank heating part and the power sales amount does not increase even if the operation of the tank heating part is prohibited, The operation of the auxiliary heat source can be suppressed by boiling the boiled water in the storage tank by the tank heating unit without inhibiting the operation so that efficient hot water supply can be performed.

According to the seventh invention, when the amount of solar radiation is smaller than the irradiation limit and the increase in the amount of sales of electric power can not be expected even if the operation of the tank heating unit is prohibited, the operation of the tank heating unit is not prohibited, By boiling the hot water, the operation of the auxiliary heat source can be suppressed and efficient hot water supply can be performed.

1 is a configuration diagram of a low-temperature type hot water supply apparatus.
2 is an explanatory view of remote controller operation.
Fig. 3 is a flow chart of the first embodiment of the setting processing of the time zone for which heating is inhibited.
4 is a flowchart of a second embodiment of the setting processing of the time zone for which heating is prohibited.
5 is a flowchart of a process for canceling the operation prohibition of the heat pump unit.

Embodiments of the present invention will be described with reference to Figs. 1 to 5. Fig. 1, the low-temperature type hot water supply system 1 of the present embodiment includes a low-temperature unit 10, a heat pump unit 50 (corresponding to the electric load and the tank heating unit of the present invention), a gas heat source unit 80, (Constituting the auxiliary heat source unit of the present invention) and a controller 120 for controlling the overall operation of the low-temperature water heater 1.

The low temperature hot water supply system 1 is connected to the power conditioner 151 along with other electrical loads such as the electrical appliances 170 through an electrical distribution board 153 and operates using the power supplied from the power conditioner 151 .

The power conditioner 151 is connected to the photovoltaic apparatus 150 and to the commercial power supply line 160 via the power meter 152. The power conditioner 151 converts the DC power output from the solar power generator 150 into AC power such as commercial power (for example, single-phase three-wire AC 100 V / 200 V) And the electric appliance such as the household appliance 170.

The power conditioner 151 is connected to the power meter 152 to supply surplus power to the commercial power supply line 160 when the amount of power generated by the photovoltaic power generator 150 exceeds the total power consumption of the electrical load We sell electricity. When the amount of power generated by the photovoltaic power generation device 150 is lower than the total power consumption of the electric load, power purchase is performed to supply power from the commercial power supply line 160 to the insufficient power.

The measurement data of the power generation amount Wd of the photovoltaic power generator 150 is output from the power conditioner 151 to the controller 120. [ When the power supply amount Cd from the commercial power supply line 160 to the power conditioner 151 is negative (negative), the power meter 152 indicates the power sale state, and when it is positive, Quot; indicating the purchase status).

A solar radiation sensor 154 is provided in the vicinity of the light receiving panel of the solar power generating apparatus 150 and measurement data of the solar radiation amount Sd by the irradiation amount sensor 154 is output from the irradiation amount sensor 154 to the controller 120.

1 shows one controller 120 as a controller of the low-temperature type hot water supply system 1, the controller of the hot water unit 10, the controller of the heat pump unit 50, and the gas heat source unit 80 May be separately provided, and the overall operation of the low-temperature type hot water supply system 1 may be controlled by communication between the controllers.

The controller 120 has a function of communicating with the information server 181 via the communication network 180 and acquires climate information and the like from the information server 181 as described later.

The low temperature unit (10) has a storage tank (11), a water supply pipe (12), a hot water supply pipe (13), and the like. The storage tank 11 stores hot water and stores the hot water therein. The tank temperature sensors 14 to 17 are disposed at substantially equal intervals in the height direction. The storage tank 11 is disposed at an upper portion of the storage tank 11, A tank tapping temperature sensor 26 for detecting the temperature of hot water supplied to the tank 13 is provided. At the bottom of the holding tank 11, there is provided a drain valve 18 which is opened or closed by manual operation of the operator.

One end of the water supply pipe 12 is connected to a water supply (not shown) through the water supply port 30, and the other end is connected to the lower portion of the water storage tank 11 to supply water to the lower portion of the water storage tank 11. The water supply pipe 12 is provided with a pressure reducing valve 19 for preventing the internal pressure of the storage tank 11 from becoming excessive and a water supply pipe 19 for allowing the flow of water only from the water supply pipe 12 to the storage tank 11 Side check valve 20 for preventing the flow of the hot water from the storage tank 11 to the water supply pipe 12 side is provided.

The water supply bypass pipe 34 branched from the water supply pipe 12 communicates with the outlet pipe 13 from the connection point X through the hot water supply mixing valve 21 and is connected to the hot water storage tank 21 by the hot water supply mixing valve 21, The mixing ratio of the hot water supplied from the hot water supply pipe 11 to the hot water discharge pipe 13 and the water supplied from the water supply bypass pipe 34 to the hot water discharge pipe 13 is changed.

The water supply bypass pipe 34 is provided with a water supply temperature sensor 22 for detecting the temperature of the water supplied to the water supply bypass pipe 34 and a water flow rate sensor for detecting the flow rate of water flowing through the water supply bypass pipe 34 23 and the water supply bypass pipe 34 to the outlet pipe 13 so as to prevent the flow of the hot water from the outlet pipe 13 to the water supply bypass pipe 34 side, A valve 24 is provided.

One end of the outlet pipe (13) is connected to the hot water supply port (31) and the other end is connected to the upper portion of the storage tank (11).

The hot water stored in the upper portion of the storage tank 11 is supplied from the hot water supply pipe 13 through the hot water supply port 31 to a hot water supply tank (kitchen water tank, toilet water, shower water, etc.). The hot water tank 13 is provided with a second hot water tank 13 for preventing the inflow of hot water from the hot water tank 13 to the hot water tank 11 by allowing only water in the direction from the hot water tank 11 to the hot water tank 13, There is provided a check valve 25 and a hot side flow rate sensor 27 for detecting the flow rate of hot water supplied to the hot water tank 13 from the hot water tank 11.

The gas heat source unit 80 is provided on the downstream side of the connection point X of the outlet pipe 13 with the water supply bypass pipe 34 and the gas heat source unit 80 is bypassed to the low temperature unit 10 A hot water bypass pipe 33 for communicating the downstream side of the gas heat source unit 80 with the hot water outlet 13 on the upstream side and a hot water bypass valve 29 for opening and closing the hot water bypass pipe 33 are provided have.

The temperature of the hot water supplied to the hot water discharge pipe 13 through the hot water supply mixing valve 21 is set between the branching point Y of the hot water supply pipe 13 to the hot water supply bypass pipe 33 and the hot water supply mixing valve 21 A mixed temperature sensor 28 for detecting the temperature of the hot water from the hot water supply port 31 is provided between the confluent portion Z of the hot water tapping pipe 33 and the hot water supply port 31, A hot water temperature sensor 32 for detecting the temperature of the hot water is provided.

The detection signal of each sensor provided in the water storage unit 10 is input to the controller 120. The operation of the hot water supply mixing valve 21 and the tapping bypass valve 29 is controlled by a control signal output from the controller 120. [

Next, the heat pump unit 50 is installed outdoors by circulating hot water in the storage tank 11 through the tank circulation path 41 and heating it. The heat pump unit 50 is a heat pump 51 constituted by an evaporator 53, a compressor 54, a heat pump heat exchanger 55 (condenser) and an expansion valve 56 connected by a heat pump circulation path 52. Have

The evaporator 53 is disposed between the air (outdoor air) supplied by the rotation of the fan 60 and the heating medium (alternate flon such as hydrofluorocarbon (HFC), carbon dioxide, etc.) flowing through the heat pump circulation path 52 Heat exchange is carried out. The compressor 54 compresses the heating medium discharged from the evaporator 53 to a high pressure and a high temperature and sends it to the heat pump heat exchanger 55. The expansion valve 56 releases the pressure of the heat medium pressurized by the compressor 54.

The defrosting valve 61 is provided to bypass the expansion valve 56 and defrosts the evaporator 53 by the heating medium sent out from the compressor 54. A heat medium temperature sensor (not shown) for detecting the temperature of the heat medium circulating in the heat pump circulation path 52 is provided on the upstream side and the downstream side of the expansion valve 56 of the heat pump circulation path 52 and the upstream side and the downstream side of the compressor 54 62, 63, 64, and 65, respectively. The evaporator 53 is also provided with an ambient temperature sensor 67 for detecting the temperature Tout of the air sucked into the evaporator 53.

The heat pump heat exchanger 55 is connected to the tank circulation path 41 and is connected to the tank circulation path 41 by the heat exchanger between the heat medium, which has been at high pressure and high temperature by the compressor 54, and the hot water flowing in the tank circulation path 41. The hot water which distributes the inside is heated. The tank circulation path 41 is provided with a tank circulation pump 66 for circulating the hot water in the reservoir tank 11 through the tank circulation path 41.

The hot water stored in the lower portion of the storage tank 11 is introduced into the tank circulation path 41 by the tank circulation pump 66 and heated to the boiling temperature described later in the heat pump heat exchanger 55 to be supplied to the upper portion of the storage tank 11 Is returned. As a result, the boiled water of the boiling temperature is stacked and stored sequentially from the upper part of the storage tank 11.

On the upstream side and the downstream side of the heat pump heat exchanger 55 of the tank circulation path 41 are provided water tap water temperature sensors 68 and 69 for detecting the temperature of the tap water circulating in the tank circulation path 41. The heat pump heat exchanger (55) is provided with an ambient temperature sensor (57) for detecting the ambient temperature inside the heat pump heat exchanger (55).

The detection signal of each sensor provided in the heat pump unit 50 is input to the controller 120. The operation of the compressor 54, the tank circulation pump 66, and the fan 60 is controlled by a control signal output from the controller 120. [

The gas heat source unit 80 heats the hot water flowing through the hot water pipe 13 and is supplied to the hot water heat exchanger 82 heated by the hot water tank burner 81 and the hot water burner 81 housed in the cylinder 87 And the like. In the hot water burner 81, fuel gas is supplied from a gas supply pipe (not shown) and combustion air is supplied by a combustion fan (not shown). The controller 120 controls the flow rate of the fuel gas and the combustion air to be supplied to the hot water supply burner 81 to control the combustion amount of the hot water supply burner 81.

The hot water heat exchanger (82) is connected in the middle of the hot water discharge pipe (13) and heats the hot water circulating inside by the heat of combustion of the hot water burner (81). The water outlet pipe 13 is provided with a water stop valve 93 and a water quantity sensor 88 in this order from the upstream side. The heat source bypass pipe 89 is connected to the upstream side and the downstream side of the hot water heat exchanger 82 by a heat source bypass pipe 89 and a heat source bypass pipe 89 for controlling the opening degree of the heat source bypass pipe 89 A valve 90 is provided. A hot water temperature sensor 91 is provided near the outlet of the hot water heat exchanger 82 of the hot water tank 13 and a hot water hot water temperature sensor 91 is provided on the downstream side of the connection point of the hot water pipe 13 with the hot water bypass pipe 89 A sensor 92 is provided.

With this configuration, as will be described later, when the hot water is absent in the storage tank 11 (the hot water is exhausted), the water is discharged from the water supply pipe 12 through the storage tank 11 and the water supply bypass pipe 34, Water supplied to the hot water supply pipe 13 is heated by the hot water heat exchanger 82 to become hot water and mixed with water from the heat source bypass pipe 89 so that hot water of the target hot water temperature is supplied from the hot water supply port 31 .

The controller 120 is an electronic circuit unit constituted by a CPU, a memory, and the like (not shown). By executing the control program of the low temperature hot water supply device 1 recorded in the memory by the CPU, the date information acquiring unit 121, An information acquiring unit 122, a heating prohibition target time zone setting unit 123, a tank heating control unit 124, and a temperature adjustment control unit 125. [

The controller 120 is connected to the remote controller 140 (corresponding to the manual operation portion of the present invention) by the communication cable 130. [ The remote controller 140 is provided with a display unit 141 for displaying the operating conditions and operating conditions of the low temperature hot water supply unit, and a switch unit 142 provided with various switches. The user of the low temperature type hot water supply apparatus 1 performs setting of the hot water supply temperature (target hot water temperature) from the hot water supply port 31 by operating the switch portion 142 of the remote controller 140. [

The date information acquisition unit 121 acquires the current date information by communication with the remote controller 140 and recognizes the current date.

The weather information acquiring unit 122 acquires climate information from the information server 181 via the communication network 180. [

The tank heating control unit 124 detects the consumption of hot water in the storage tank 11 by the detected temperature of the tank temperature sensors 14 to 17 and operates the heat pump unit 50 when the hot water is exhausted, (11) is heated to a boiling temperature set at a temperature higher than the target hot water temperature. For example, when the target hot water temperature is set to 40 占 폚 by the remote controller 140, the tank heating control unit 124 sets the boiling temperature to 45 占 폚.

When the detected temperature of the tank temperature sensor 17 at the upper portion of the storage tank 11 becomes lower than 40 캜 (boiling temperature -5 캜), the tank heating control unit 124 stores the water consumption in the storage tank 11 .

The tank heating control section 124 operates the heat pump unit 50 to cause the water in the lower part of the storage tank 11 to reach the boiling temperature by the heat pump heat exchanger 55 when the hot water in the storage tank 11 is exhausted And the boiling water is boiled from the upper part of the storage tank 11 by stacking the boiling water at a boiling temperature by heating.

The tank heating control section 124 detects the stacking state of the boiled water in the boiling tank 11 by the detected temperature of the tank temperature sensors 14 to 17 during the boiling operation and outputs the boiling temperature The boiling operation is finished.

The temperature control unit 125 controls the temperature of the water supply pipe 12 to be lower than the minimum operating flow rate (for example, 2.4 liters / min) by opening the hot water supply connection (not shown) connected through the hot water supply port 31 (Total detected flow rate) of the detected flow rate of the hot-side flow rate sensor 27 and the detected flow rate of the downstream-side flow rate sensor 23, the hot water of the target hot- The hot water supply operation is executed.

The temperature adjustment control unit 125 closes the exponent valve 93 and opens the tap water bypass valve 29 when the hot water in the storage tank 11 is not exhausted. The temperature adjustment control unit 125 adjusts the detected temperature Th of the tank hot water temperature sensor 26 (the temperature of the hot water supplied from the warming tank 11 to the hot water pipe 13) and the detected flow rate of the hot water flow sensor 27 (The flow rate of the hot water supplied from the holding tank 11 to the hot water discharge pipe 13) and the detected temperature Tw of the water supply temperature sensor 22 (from the water supply bypass pipe 34 to the hot water supply pipe 13) And the water flow rate Fw of the water flow sensor 23 (the flow rate of the water supplied from the water supply bypass pipe 34 to the hot water discharge pipe 13) Supplied from the hot water tank 11 to the hot water supply pipe 13 by the hot water supply mixing valve 21 so that the hot water of the target hot water temperature is supplied from the connection point X to the hot water supply pipe 13, And the water supplied from the water supply bypass pipe (34) to the outlet pipe (13) is set.

When the boil-off water in the boil-off tank 11 has been exhausted, the temperature control unit 125 closes the boil-off bypass valve 29 and opens the boil-off valve 93, The water from both the storage tank 11 and the water supply bypass pipe 34 is supplied to the outlet pipe 13. [

The temperature control unit 125 operates the gas heat source unit 80 so that the detected temperature Tw of the water supply temperature sensor 22 (the water supply bypass pipe) is controlled so that the detected temperature of the heat source hot water temperature sensor 92 becomes the target hot water temperature. (The temperature of the water supplied to the hot water discharge pipe 13 from the hot water burner 34) and the detected flow rate Fw of the water amount sensor 88 (the flow rate of the water supplied to the hot water discharge pipe 13) Quot; heating temperature control " for controlling the opening degree of the heat source bypass valve 90 is executed.

The configuration in which the " heating temperature control " is performed by the temperature control unit 125 and the gas heat source unit 80 as described above corresponds to the auxiliary heat source of the present invention.

Here, when the boiling operation by the tank heating control unit 124 is performed, the electric power supplied from the power conditioner 151 is consumed by the operation of the heat pump unit 50. [ Therefore, when boiling water is boiled in the storage tank 11 by the tank heating control unit 124 during the daytime when the solar power generation apparatus 150 is generating electricity, the power consumption of the heat pump unit 50 The electric power sales amount is reduced and the power cost is disadvantageously lowered.

Therefore, the heating prohibition target time zone setting unit 123 sets the heating prohibition target time zone, which is the time zone for prohibiting the boiling operation by the tank heating control unit 124, The execution of the boiling operation by the tank heating control section 124 is limited.

Hereinafter, the processing for setting the heating prohibition target time period by the heating prohibition target time period setting section 123 will be described with reference to Figs. 2 to 5. Fig.

2, the user of the low-temperature type hot water supply apparatus 1 operates the remote controller 140 to suppress the boiling operation of the storage tank 11 by the tank heating control unit 124, (The mode for setting the heating prohibition time zone according to the month and the climate described later) and the manual mode for setting the heating prohibition time zone Mode (a mode for setting the heating prohibited time zone by the start time and the end time set by the user) and the start time and the end time of the heating prohibited time zone by the manual mode can be set.

The user first operates the switch unit 142 of the remote controller 140 to display the mode selection screen 200 of the " solar power generation mode " The mode selection screen 200 is displayed on the screen 200a for setting / canceling the "solar power generation mode" by the operation of the switch unit 142, the switching screen 200b for switching the automatic / manual mode, Is set to the time setting screen 200c of FIG.

In the screen 200a for setting / canceling the "solar power generation mode", the user can designate the setting and cancellation of the "solar power generation mode". When the " photovoltaic generation mode " is set, the heating prohibition target time zone setting unit 123 sets the time zone for prohibiting heating to restrict the operation of the heat pump unit 50. [ When the " solar power generation mode " is canceled, the heating prohibition target time period setting section 123 does not set the heating prohibition target time zone. In this case, the operation of the heat pump unit 50 is not limited.

In the automatic / manual mode switching screen 200b, the user can select whether to set the heating prohibited time zone himself / herself (passive mode) or not (hypothetical mode) have.

Furthermore, when the manual mode is selected, the user can instruct to set the start time (setting screen 201a) and the ending time (setting screen 201b) of the prohibited time zone on the setting screen 201 of the prohibited time zone . When the start time and the end time are set to the same time, the operation mode of the heat pump unit 50 is prohibited all day, which is called " solar power generation mode ".

[First Embodiment of Setting Process of Heating-prohibited Target Time Zone]

Next, a first embodiment of the setting process of the heating prohibition target time period by the heating prohibition target time period setting unit 123 will be described with reference to the flowchart shown in Fig. The heating prohibition target time period setting section 123 repeatedly executes the flowchart shown in Fig. 3 to set the heating prohibition target time period.

In STEP 1 of FIG. 3, the heating prohibition time zone setting unit 123 determines whether the current date and time of the remote controller 140 is set or not. The current date and time of the remote controller 140 is set by the user by operating the switch unit 142. [ The date information acquiring unit 121 acquires the date information acquired by the date information acquiring unit 121 by communication with the remote controller 140. The date information acquiring unit 121 acquires the date information, And acquires date information. Further, the controller 120 may be provided with a calendar function and a calendar function.

If the current date and time of the remote controller 140 has been set, the process proceeds to STEP 2, and the heating prohibition time zone setting unit 123 determines whether or not the " solar power generation mode " When the " solar power generation mode " is being canceled, the process returns to STEP 1, and when the " solar power generation mode "

In STEP 3, the heating prohibition target time zone setting unit 123 determines whether or not the heating prohibition target time zone setting unit 123 is set to the manual mode. If it is set to the manual mode, the process goes to STEP 4. The heating prohibition target time zone setting unit 123 sets the prohibition time zone based on the start time and the end time of the instructions set on the remote controller 140 as the heating prohibition target time zone.

On the other hand, when the automatic mode is set, the processing goes to STEP 10. The heating prohibition target time zone setting unit 123 sets the heating prohibition target time zone setting unit 123 in the month (April if the current date is April 1), May to July, February to April, August to October, and November to January.

When the month in which the current date belongs is from May to July, the prohibited time zone A (9:00 to 16:00) is set as the heating prohibited time zone in STEP 11, and the process returns to STEP 1. When the month in which the current date belongs is from February to April or from August to October, the prohibited time zone B (10:00 to 16:00) is set as the heating prohibited time zone in STEP 12, and the process returns to STEP 1 . If the month in which the current date belongs is from November to January, the prohibited time zone C (11:00 to 16:00) is set as the heating prohibited time zone in STEP 13, and the process returns to STEP 1.

In this way, by setting the time zone for prohibition of heating according to the month in which the current date belongs, the time zone in which the amount of irradiation of the other solar radiation is large can be set as the time zone for prohibiting heating. The setting of the prohibited time zone is not limited to the patterns A, B, and C described above.

[Second Embodiment of Setting Process of Heating-prohibited Time Zone]

Next, a second embodiment of setting processing of a heating prohibition target time period by the heating prohibition target time period setting section 123 will be described with reference to the flowchart shown in Fig. STEP 20 to STEP 23 of the flowchart shown in FIG. 4 are the same as those of STEP 1 to STEP 4 of the flowchart shown in FIG. 3, and STEP 32 shown in FIG. 4 corresponds to STEP 10 to STEP 13 shown in FIG. Processing routine.

Therefore, the flowchart of FIG. 4 is different from the flowchart of FIG. 3 only in the processing of STEP 30 and STEP 31 branched from STEP 22. STEP 30 is processing by the weather information acquisition unit 122. The weather information acquisition unit 122 acquires weather data from the information server 181 (see FIG. 1). In the following STEP 31, the heating prohibition time zone setting unit 123 judges whether or not the weather forecast of today is fine, based on the data of the weather information.

If the weather forecast of the present day is not fine, the routine branches to STEP 20. In this case, the heating prohibition target time zone is not set. On the other hand, when the current weather forecast is clear, the program proceeds to STEP 32 and, as in the first embodiment described above, the heating prohibited time zone setting unit 123 sets the heating prohibited zone in accordance with the month in which the current date belongs do.

According to the second embodiment, when it is expected that the power generation amount of the photovoltaic device 150 can be expected to increase due to the clear weather forecast, the operation of the heat pump unit 50 is suppressed by setting the time zone for prohibition of heating , And sales of generated power by the solar power generation device 150 can be promoted. When the hot water in the storage tank 11 is exhausted during the operation prohibition of the heat pump unit 50, the hot water flowing through the hot water discharge pipe 13 is discharged to the gas heat source unit 80 to the target hot water temperature.

On the other hand, when the solar power generation apparatus 150 is assumed to have a small power generation amount other than the weather forecast (cloudy, rain, etc.), even if the operation of the heat pump unit 50 is inhibited, The increase in the sales volume of the generated power can not be expected. Therefore, in this case, hot water is efficiently boiled in the storage tank 11 by the heat pump unit 50 without setting the time zone for prohibition of heating.

Next, the tank heating control section 124 repeatedly executes the process according to the flowchart of Fig. 5 (a) during the heating prohibited time period to monitor the power generation amount of the solar power generation apparatus 150. [ In STEP 40 of FIG. 5A, the tank heating control section 124 determines whether or not the automatic mode is being executed, and proceeds to STEP 41 when the automatic mode is selected.

In STEP 41, the tank heating control section 124 determines that the power generation amount Wd of the photovoltaic power generation apparatus 150 is not less than the total power consumption Wd_th (corresponding to the power generation amount limit value of the present invention) of the electric loads other than the heat pump unit 50 Or not. If the power generation amount wd of the photovoltaic power generation apparatus 150 is equal to or greater than Wd_th and the operation of the heat pump unit 50 is inhibited, the process proceeds to STEP 42. The tank heating control unit 124 controls the heat pump unit 50, (50) is prohibited.

On the other hand, when the power generation amount Wd of the photovoltaic power generation device 150 is less than Wd_th and the power supply state can not be obtained even if the operation of the heat pump unit 50 is prohibited, the tank heating control unit 124 branches to STEP 50, (50).

Alternatively, the processing according to the flowchart of Fig. 5 (a) may be performed instead of the processing according to the flowchart of Fig. 5 (a) or the processing according to the flowchart of Fig.

The flowchart of FIG. 5 (b) shows the determination by the power generation amount Wd of the photovoltaic apparatus 150 of STEP 41 in FIG. 5 (a) by the irradiation amount Sd detected by the irradiation amount sensor 154 of STEP 61 . The tank heating control section 124 repeatedly executes the process according to the flowchart of Fig. 5 (b) during the heating inhibition target time period to monitor the irradiation amount.

In STEP 61 of FIG. 5 (b), the tank heating control section 124 determines that the solar radiation amount Sd is equal to the solar radiation amount limit value Sd_th {the operation of the heat pump unit 50 is prohibited, Is set by assuming a lower limit of the amount of solar radiation that can be obtained}.

When the irradiation amount Sd is equal to or greater than Sd_th, the process proceeds to STEP 62, in which the tank heating control section 124 prohibits the operation of the heat pump unit 50. On the other hand, when the solar radiation amount Sd is smaller than Sd_th, the operation branches to STEP 70, and the tank heating control unit 124 permits operation of the heat pump unit 50. [

5A and 5B, the power generation amount of the solar cell power generation device 150 is large and the operation of the heat pump unit 50 is inhibited by the process of the flowchart of FIGS. 5A and 5B, The operation of the heat pump unit 50 can be prohibited only when the sales of the generated power of the heat pump unit 50 is promoted. Therefore, even in the time zone during which heating is inhibited, the heat pump unit 50 can be operated according to the situation, and the boiled water in the storage tank 11 can be efficiently boiled.

In the present embodiment, the low-tank type hot water supply system 1 having the heat pump unit 50 is shown as the tank heating unit of the present invention. However, the electric water heater for heating the hot water in the low- The present invention can be applied to a low-temperature type hot water supply apparatus having a tank heating unit of the configuration.

In the present embodiment, the setting contents of the time zone by the user's operation, the month in which the current date belongs, and the weather forecast (whether or not it is fine) are shown as predetermined conditions for setting the heating prohibition target time zone of the present invention, The heating prohibition target time zone may be set by using other conditions.

5 (a) and 5 (b), the heat pump unit 50 is heated in accordance with the power generation amount Wd and the irradiation amount Sd of the photovoltaic device 150 in the heating prohibited time zone, It is possible to obtain the effect of the present invention even when such processing is not performed.

1: low temperature hot water supply unit 10: low temperature unit
11: Reservoir tank 12: Water supply pipe
13: hot water tank 50: heat pump unit
80: gas heat source unit 120: controller
121: date information acquisition unit 122: weather information acquisition unit
123: Time zone for heating prohibition installation part 124: Tank heating control part
125: Temperature control unit 150: Photovoltaic device
151: Power conditioner 181: Information server

Claims (7)

The solar power generating apparatus and the commercial power supply line are connected to the electric load, and when the power generation amount of the solar power generation device exceeds the power consumption of the electric load, surplus electricity generated by the solar power generation device is sold, As a low-temperature type hot water supply apparatus using power supplied from a power conditioner for purchasing power shortage when the power generation amount of the photovoltaic device is lower than the power consumption of the electric load,
A storage tank,
A water supply pipe connected to the storage tank for supplying water to the storage tank,
A tank heating unit which is the electric load operated by the power supplied from the power conditioner and heats boiled water in the storage tank,
A hot water tank connected to the storage tank and supplied with hot water from the storage tank,
An auxiliary heat source installed in the middle of the outlet pipe for heating hot water to a target hot water temperature when the temperature of the hot water flowing through the outlet pipe is lower than a predetermined target hot water temperature,
A heating prohibition target time zone setting unit which prohibits the operation of the tank heating unit and sets a heating prohibition target time zone, which is a time zone during the day to promote an increase in the amount of power sold by the power conditioner, according to a predetermined condition;
And a tank heating control unit for prohibiting the operation of the tank heating unit in the heating inhibition target time zone.
The method according to claim 1,
A date information acquisition unit for acquiring date information;
And the predetermined condition is a month to which a current date acquired by the date information acquisition unit belongs.
The method according to claim 1,
A weather information acquisition unit for acquiring weather information;
And said predetermined condition is a weather forecast based on weather information acquired by said weather information acquisition unit.
The method according to claim 1,
It is provided with the manual operation part which receives the setting instruction of the said heating prohibition target time zone by user's operation,
And said predetermined condition is an instruction content by said manual operation unit.
The method according to any one of claims 1 to 4,
The tank heating control section monitors the power generation amount of the solar power generation device during the heating inhibition time zone and prohibits the operation of the tank heating section only when the power generation amount of the solar power generation device is equal to or larger than a predetermined power generation amount limit value Low temperature hot water supply system.
The method according to claim 5,
And the total power consumption of the electric loads other than the tank heating unit is set as the power generation amount limit value.
The method according to claim 1,
A radiation amount sensor for detecting a radiation amount,
Wherein the tank heating control unit monitors the irradiation amount detected by the irradiation amount sensor in the time zone for prohibiting the heating and prohibits the operation of the tank heating unit only when the irradiation amount is equal to or larger than a predetermined irradiation amount limit value .

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