JP4620908B2 - Hot water storage water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water storage tank having a hot water supply channel connected to the upper part and a water supply channel connected to the lower part, and hot water taken out from the bottom of the hot water storage tank. Hot water circulation means for circulating hot water in a form to be supplied to the upper part, and operation control means for controlling the operation of the heating means are provided,
When the heating control condition is satisfied, the operation control means heats the hot water circulated by the hot water circulation means to hot water having a hot water storage set temperature by the heating means to form a temperature stratification in the hot water storage tank. The hot water storage apparatus is configured to store hot water in the hot water storage tank and supply hot water stored in the hot water storage tank through the hot water supply passage.
[0002]
[Prior art]
The hot water storage type hot water supply apparatus as described above supplies hot water stored in the hot water storage tank through the hot water supply passage, and when the heating condition is satisfied, hot water circulated by the hot water circulation means is set as hot water storage by the heating means. The hot water is heated to hot water and stored in a hot water storage tank in a state where temperature stratification is formed, and hot water stored in the hot water storage tank is supplied (for example, JP 2000-121160 A).
[0003]
In this type of hot water storage system, the hot water stored in the hot water storage tank is used for hot water supply, but after all the hot water stored in the hot water storage tank has been used, If hot water is stored in the hot water tank, hot water that is lower than the desired temperature may be supplied in the middle of the hot water supply, causing hot water to run out. The condition for starting hot water storage in the hot water tank before the amount becomes smaller is set, so that hot water storage in the hot water tank starts before the amount of hot water stored in the hot water tank becomes smaller than the minimum secured amount. I have to.
[0004]
Conventionally, a hot water storage tank is provided with a thermistor that detects a minimum detected hot water amount that is larger than the minimum ensured amount by detecting the hot water temperature, and the hot water storage in the hot water tank is made the minimum detected hot water amount by the thermistor. When it is detected that the heating condition is satisfied, the hot water storage in the hot water storage tank is started before the hot water storage amount in the hot water storage tank becomes smaller than the minimum secured amount.
[0005]
[Problems to be solved by the invention]
However, the conventional hot water storage type hot water supply apparatus determines that the heating condition has been satisfied when the thermistor detects that the hot water storage amount in the hot water storage tank becomes the minimum detected hot water storage amount greater than the minimum ensured amount. Since the means is operated, hot water storage in the hot water storage tank is started in a state where the hot water storage amount in the hot water storage tank is not the minimum ensured amount.
Therefore, despite the fact that there is a lot of hot water that can be used for hot water supply in the hot water storage tank, hot water is stored in the hot water storage tank, leading to an increase in the amount of energy for operating the heating means, and in the hot water storage tank. The hot water stored in the hot water is dissipated unnecessarily, which may reduce the efficiency of the apparatus.
[0006]
By the way, if the thermistor can detect that the amount of hot water stored in the hot water tank reaches the minimum, the hot water storage in the hot water tank can be started when the amount of hot water stored in the hot water tank reaches the minimum. Thus, the above disadvantages can be eliminated.
However, the thermistor needs to be installed near the top of the hot water storage tank in order to detect the minimum amount secured, whereas the thermistor is installed near the top of the hot water storage tank due to the shape of the hot water storage tank. Even if the minimum amount secured cannot be accurately detected, or because it cannot be installed near the top of the hot water storage tank due to problems in the production of the hot water storage tank, the minimum secured amount is actually set with a thermistor. It is difficult to detect.
[0007]
The present invention has been made paying attention to this point, and its purpose is to improve the efficiency of the apparatus by supplying as much hot water as possible in the hot water storage tank while preventing hot water from running out. It is in the point which provides the hot water storage type hot-water supply apparatus which becomes possible.
[0008]
[Means for Solving the Problems]
In order to achieve this object, according to the first aspect of the present invention, a hot water storage tank having a hot water supply channel connected to the upper part and a water supply channel connected to the lower part, and hot water taken out from the bottom of the hot water storage tank are provided. Hot water circulating means for circulating hot water in a form to supply the hot water to the upper part of the hot water storage tank after heating by the heating means, and operation control means for controlling the operation of the heating means are provided,
When the heating control condition is satisfied, the operation control means heats the hot water circulated by the hot water circulation means to hot water having a hot water storage set temperature by the heating means to form a temperature stratification in the hot water storage tank. A hot water storage device configured to store hot water in the hot water storage tank and supply hot water through the hot water supply passage,
When the operation control means is supplying hot water in the hot water storage tank, the hot water in the hot water storage tank is discharged from the lowest detection timing at which the hot water storage amount in the hot water storage tank becomes a minimum detected hot water amount larger than the minimum secured amount. Based on the amount of hot water stored in the hot water storage tank, the amount of hot water stored in the hot water storage tank below the minimum detected hot water storage amount is managed, and when the amount of hot water stored is less than the minimum reserved amount, it is determined that the heating condition is satisfied. It is comprised so that the discrimination | determination process to perform may be performed.
[0009]
That is, when the operation control means is supplying hot water in the hot water storage tank, the hot water storage amount in the hot water storage tank manages the current hot water storage amount in a range smaller than the minimum detected hot water storage amount. If the amount is less than the minimum required amount, it is determined that the heating condition has been satisfied, and hot water storage in the hot water storage tank can be started, so the amount of hot water stored in the hot water storage tank is the minimum amount that can prevent hot water from running out. It is possible to start hot water storage in the hot water storage tank until the hot water in the hot water storage tank reaches the minimum secured amount without hot water storage in the hot water storage tank being started until the last minute. It becomes.
Accordingly, it has been possible to provide a hot water storage type hot water supply apparatus that can improve the efficiency of the apparatus by supplying as much hot water as possible in the hot water storage tank while preventing hot water from running out.
[0010]
According to invention of Claim 2, the minimum detection hot water storage amount detection means for detecting the minimum detection timing in which the hot water storage amount in the hot water storage tank becomes the minimum detection hot water storage amount is provided,
When the operation control means manages the current hot water storage amount in the hot water storage tank, the current hot water storage is based on a detection delay time when detecting the lowest detection timing based on detection information by the lowest detected hot water storage amount detection means. It is configured to manage in a state where the amount is corrected to the small amount side.
[0011]
That is, when the lowest detection timing is detected by the lowest detected hot water storage amount detection means between the time when the lowest detection timing is actually reached and the time when the lowest detection hot water detection means is detected. A detection delay time will occur, and when the minimum detection timing is detected by the minimum detection hot water detection means, the hot water storage amount in the hot water storage tank is reduced by the detection delay time compared to when the minimum detection timing is actually reached. Therefore, if the current hot water storage amount in the hot water storage tank is managed without taking into account the detection delay time when the minimum detection timing is detected by the minimum detected hot water storage amount detection means, the current hot water storage amount in the hot water storage tank is May not be managed accurately.
However, when the operation control unit manages the current hot water storage amount in the hot water storage tank, the current hot water storage amount is reduced in accordance with the detection delay time when detecting the minimum detection timing based on the detection information by the minimum detected hot water detection unit. Therefore, the current hot water storage amount in the hot water storage tank can be accurately managed.
[0012]
According to the invention of claim 3, the minimum securing is performed based on a rise time from when the operation control means operates the heating means until hot water at the hot water storage set temperature is obtained in the determination process. An amount of hot water for determination larger than the amount is set, and when the amount of stored hot water becomes less than the amount of stored hot water for determination, it is determined that the heating condition is satisfied.
[0013]
That is, after starting the hot water storage in the hot water storage tank by operating the heating means, until the hot water of the hot water storage set temperature is actually stored in the hot water storage tank, Since it will be delayed by the rise time until hot water is obtained, it will be delayed by the same rise time from the start of hot water storage in the hot water storage tank until hot water of the desired temperature is supplied, If hot water storage in the hot water storage tank is started when the current hot water storage amount in the hot water storage tank reaches the minimum ensured amount, hot water may run out.
However, the operation control means sets the amount of hot water for discrimination that can prevent hot water shortage in accordance with the rise time from when the heating means is activated until hot water at the hot water storage set temperature is obtained, and the current hot water storage in the hot water storage tank is set. When the amount reaches the determination hot water storage amount, it is determined that the heating condition is satisfied, and hot water storage in the hot water storage tank can be started, so that hot water shortage can be prevented accurately.
[0014]
According to invention of Claim 4, the hot water supply amount detection means which detects the hot water supply amount of the hot water of the hot water storage tank is provided, and when the operation control means manages the current hot water storage amount in the hot water storage tank, The hot water storage tank hot water supply amount is obtained based on the accumulated hot water supply amount of the hot water supply detected by the hot water supply amount detection means from the start of hot water supply until the minimum detection timing.
[0015]
That is, when the operation control means manages the current hot water storage amount in the hot water storage tank, the average hot water supply amount per unit time is obtained from the integrated hot water supply amount from the start of hot water supply until the lowest detection timing. Can be obtained as the hot water supply amount of the hot water storage tank, so that the required hot water storage tank can be obtained even if the hot water supply amount fluctuates slightly compared to the case where the hot water supply amount of the hot water storage tank is obtained from the instantaneous hot water supply amount of the hot water in the hot water storage tank at a certain timing. There is no large fluctuation in the amount of hot water supply, and the hot water supply amount of the hot water storage tank can be accurately obtained.
[0016]
According to the fifth aspect of the present invention, the hot water supply amount detecting means for detecting the amount of hot water supplied to the hot water storage tank is provided, and the operation control means manages the current hot water storage amount in the hot water storage tank. Sometimes, the hot water storage tank hot water supply amount is obtained based on the instantaneous hot water supply amount of the detected hot water supply amount by the hot water supply amount detecting means.
[0017]
That is, when the operation control means manages the current hot water storage amount in the hot water storage tank, it is possible to detect the instantaneous hot water supply amount from the detected hot water supply amount by the hot water supply amount detection means, and obtain the instantaneous hot water supply amount as the hot water storage tank hot water supply amount. Therefore, the hot water storage tank is not equipped with a memory for determining the accumulated hot water supply amount as compared with the case where the hot water storage tank hot water supply amount is obtained from the accumulated hot water supply amount detected by the hot water supply amount detecting means within a certain set time. The amount of hot water supply can be obtained, and the amount of hot water supply in the hot water storage tank can be obtained while simplifying the configuration.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An example in which a hot water storage type hot water supply apparatus according to the present invention is applied to an engine heat pump type air conditioning and hot water supply system will be described with reference to the drawings.
As shown in FIGS. 1 and 2, this engine heat pump type air conditioning and hot water supply system stores hot water while forming temperature stratification in the hot water storage tank 1, or hot water storage unit A for supplying hot water stored in the hot water storage tank 1. An engine heat pump type air conditioner B that can execute an air conditioning operation of the air conditioning target space and a heating operation for storing hot water in the hot water storage tank 1 is configured.
[0019]
The hot water storage unit A heats hot water flowing through the hot water storage unit control unit C that controls the operation of the hot water storage unit A, the hot water storage tank 1, the circulation path 3 for circulating hot water in the hot water storage tank 1, and the circulation path 3. The heating unit 4 and the like are configured, and the circulating pump P1 is operated to heat the hot water in the hot water storage tank 1 through the circulation path 3 and heat the heating unit 4.
[0020]
In the hot water storage tank 1, the uppermost thermistor as a minimum detected hot water storage amount detecting means for detecting whether the hot water storage amount is more than the minimum detected hot water storage amount larger than the minimum ensured amount by detecting the hot water temperature. S1 is provided with a bottom thermistor S2 for detecting whether the amount of stored hot water is full or more by detecting the temperature of the hot water.
The hot water storage tank 1 is connected to a hot water supply path 5 for supplying water to the hot water storage tank 1 from the bottom using tap water pressure, and is connected to a hot water supply path 6 for supplying hot water to a bathroom or kitchen from the upper part. It is configured to supply only the amount of water used in the kitchen or the like from the water supply channel 5 to the hot water storage tank 1.
[0021]
The hot water supply path 6 is connected to a mixing water supply path 7 branched from the water supply path 5, and the mixing ratio of the hot water from the hot water supply path 6 and the water from the mixing water supply path 7 can be adjusted to the connection location. A mixing valve 8 is provided.
A water supply thermistor 9 for detecting a water supply temperature is provided at a branch point between the water supply passage 5 and the mixing water supply passage 7.
[0022]
Further, on the upstream side of the mixing valve 8 in the hot water supply path 6, a hot water storage outlet thermistor 10 that detects the temperature of the hot water supplied from the upper part of the hot water storage tank 1 to the hot water supply path 6 is provided, and the mixing valve 8 in the hot water supply path 6 is provided. Further, a hot water supply flow rate sensor 11 for detecting the flow rate of hot water in the hot water supply passage 6 and a mixing thermistor 12 for detecting the temperature of hot water mixed by the mixing valve 8 are provided.
[0023]
The hot water supply path 6 on the downstream side of the mixing thermistor 12 branches into a general hot water supply path for supplying hot water to an unillustrated hot water tap such as a kitchen or a washroom, and a hot water supply path for supplying hot water to a bathtub outside the illustration. Has been.
When hot water is supplied to the general hot water supply path, the opening of the mixing valve 8 is set so that the temperature of the hot water to be supplied becomes the hot water supply set temperature based on the hot water supply set temperature, detection information of the hot water storage outlet thermistor 10 and the hot water supply thermistor 9 and the like. It adjusts and it is comprised so that hot water of the hot water supply preset temperature may be supplied.
In addition, when filling the bathtub, the opening of the mixing valve 8 is adjusted to supply hot water at a hot water set temperature to the bathtub, and the hot water filling ends when a hot water set amount is supplied. It is configured as follows.
The hot water supply operation means G includes a hot water storage outlet thermistor 10, a water supply thermistor 9, a mixing valve 8, a mixing thermistor 12, and the like.
[0024]
The circulation path 3 and the hot water storage tank 1 return the hot water flowing through the circulation path 3 to the hot water storage tank 1 or take out the hot water in the hot water storage tank 1 to the circulation path 3. Communication connection is made at a total of three locations at the bottom.
More specifically, a hot water storage passage 13 for supplying hot water in the circulation path 3 into the hot water storage tank 1 is connected to the upper portion of the hot water storage tank 1, and a hot water storage opening / closing valve 47 is provided in the hot water storage passage 13. It has been.
Further, both ends of the circulation path 3 are separately connected to the bottom of the hot water storage tank 1 so that hot water in the hot water storage tank 1 is taken out from one end of the circulation path 3 and flows toward the other end. It is configured.
[0025]
In the circulation path 3, a circulation flow rate sensor 15 that detects the circulation amount of the hot water in the circulation path 3, a circulation pump P 1, and a circulation flow rate adjustment valve that adjusts the circulation amount of the hot water in the circulation path 3 in the circulation direction of the hot water. 16, the heating part 4, the heating temperature thermistor 17 which detects the temperature of the hot water heated by the heating part 4, and the on-off valve 18 which interrupts the flow of hot water are provided.
The hot water circulation means E includes the circulation path 3, the circulation pump P1, the circulation flow rate sensor 15, the circulation flow rate adjustment valve 16, the heating temperature thermistor 17, the hot water storage opening / closing valve 47, the opening / closing valve 18, and the like.
[0026]
The heating unit 4 includes a heat pump heating unit 19 that heats hot water by supplying refrigerant from the engine heat pump air conditioner B, and an auxiliary heating unit that serves as a non-exhaust heat non-heating type heating unit that heats hot water by burning the burner 20. 21.
The heat pump heating unit 19 and the auxiliary heating unit 21 are provided in this order from the upstream side in the hot water circulation direction of the circulation path 3.
[0027]
The auxiliary heating unit 21 is provided with a gas combustion type burner 20 and a fan 22 for supplying combustion air to the burner 20, and is configured to heat hot water flowing through the circulation path 3 by combustion of the burner 20. Has been.
The fuel supply passage 23 for supplying fuel gas to the burner 20 is provided with a gas safety valve 24, a gas proportional valve 25, and a gas main valve 26 in order from the upstream side, and hot water flowing into the auxiliary heating unit 21. An auxiliary heating water amount sensor 27 for detecting the flow rate is provided.
[0028]
The auxiliary heating unit 21 starts combustion of the burner 20 when the amount of water equal to or larger than the set amount is detected by the auxiliary heating water amount sensor 27, and the auxiliary heating water temperature sensor 28 and the auxiliary heating water amount sensor 27 Based on the detection information, the rotational speed of the fan 22 and the opening of the gas proportional valve 25 are adjusted, the temperature of the hot water heated by the auxiliary heating unit 21 is adjusted, and the amount of heat supplied to the hot water is adjustable. Yes.
[0029]
The engine heat pump air conditioner B includes a plurality of indoor units 31, an outdoor unit 32, an indoor unit 31, and a heat pump operation control unit D that controls the operation of the outdoor unit 32, and includes a plurality of air conditioning target spaces (for example, each The room is configured to perform air conditioning such as heating or cooling.
The indoor unit 31, the outdoor unit 32, and the heat pump heating unit 19 in the hot water storage unit A are connected by a refrigerant pipe 29 so that the refrigerant in the engine heat pump cooling / heating device B can be supplied to the heat pump heating unit 19. ing.
[0030]
Each of the plurality of indoor units 31 is provided with an electronic expansion valve 33, an indoor heat exchanger 34, and an indoor air conditioner blower 35 that sends out temperature-controlled air to the air-conditioning target space. The opening degree of the electronic expansion valve 33 is adjusted based on detection information of the refrigerant thermistor 48 that detects the temperature of the refrigerant condensed in the heat exchanger 34.
[0031]
The outdoor unit 32 includes a gas engine 36, a compressor 37, an accumulator 38, a four-way valve 39, an outdoor heat exchanger 40, and an outdoor air conditioner blower 41 that ventilates the outside air to the outdoor heat exchanger 40. A radiator 42 for radiating exhaust heat of the engine 36 to the outside and a radiator blower 43 are also provided.
In addition, a cooling water passage 44 for circulating cooling water for cooling the gas engine 36 to and from the radiator 42 is provided, and a radiator pump P3 is provided in the cooling water passage 44.
[0032]
The heat pump operation means K includes an electronic expansion valve 33, an indoor air conditioner blower 35, a gas engine 36, a compressor 37, a four-way valve 39, an outdoor air conditioner blower 41, and the like.
Further, the cooling water circulation means L is constituted by a radiator pump P3, a radiator blower 43, an radiator 42, and the like.
[0033]
The operation of the engine heat pump air conditioner B is controlled by the heat pump operation control unit D based on a command from the air conditioner remote controller R1, the compressor 37 is operated by the gas engine 36, and the cooling operation is performed by switching the four-way valve 39. And heating operation can be selectively switched, and air conditioning is performed in a room requiring air conditioning by opening / closing control of the electronic expansion valve 33 of the indoor unit 31.
Further, when the hot water in the circulation path 3 is heated by the heat pump heating unit 19, the heating operation is performed, and the electronic expansion valve 33 is controlled to supply the refrigerant to the heat pump heating unit 19.
[0034]
The hot water storage unit control unit C and the heat pump operation control unit D are configured to be able to transmit and receive control signals such as that the engine heat pump air conditioner B is in an air conditioning operation and a drive request to the engine heat pump air conditioner B. ing.
And the hot water storage unit control part C and the heat pump operation control part D as an operation control means are based on the command of the air-conditioning remote control R1 or hot water storage remote control R2 installed in each room as an air-conditioning target space. Each operation is performed such as an air conditioning operation such as a cooling operation or a heating operation, a hot water storage operation in which hot water is stored in the hot water storage tank 1, and a hot water supply operation in which desired hot water is supplied to a hot-water tap outside the figure. Yes.
[0035]
Hereinafter, description will be added for each operation.
In the cooling operation, as shown by the solid arrows in FIG. 2, the refrigerant is circulated in the order of the compressor 37, the four-way valve 39, the outdoor heat exchanger 41, the indoor heat exchanger 34, the four-way valve 39, and the accumulator 38. It is configured to cool the target room.
In the heating operation, as shown by the dotted arrows in FIG. 2, the refrigerant is circulated in the order of the compressor 37, the four-way valve 39, the indoor heat exchanger 34, the outdoor heat exchanger 41, the four-way valve 39, and the accumulator 38, and the heating operation is performed. It is configured to heat the target room.
The heat pump operation control unit D operates the radiator pump P3 in the cooling operation and the heating operation, operates the radiator blower 43, and causes the radiator 42 to radiate heat.
[0036]
In the hot water storage operation, when a hot water storage request is received from the hot water remote controller R2, the hot water opening / closing valve 47 is opened, the circulation pump P1 is operated, water is taken out from the bottom of the hot water storage tank 1 to the circulation path 3, and After heating, the hot water is supplied to the upper part of the hot water storage tank 1 through the hot water storage passage 13.
The operation of the heating unit 4 in the hot water storage operation will be described. If the engine heat pump air-conditioning apparatus B is not in the air-conditioning operation, the electronic expansion valve 33 is controlled to be opened so that the engine heat pump air-conditioning apparatus B is heated. Then, the refrigerant is supplied to the heat pump type heating unit 19 and the hot water in the circulation path 3 is heated by the heat pump type heating unit 19 so that the temperature detected by the heating temperature thermistor 17 becomes the target hot water storage temperature (for example, 60 ° C.). The heat pump type heating unit 19 is configured to adjust the heating amount.
And only by the heating by the heat pump heating unit 19, the hot water in the circulation path 3 cannot be heated so that the temperature detected by the heating temperature thermistor 17 becomes the target hot water storage temperature (for example, 60 ° C.), or the heat pump heating unit 19 In the case where heating cannot be performed, the rotational speed of the fan 22 and the opening of the gas proportional valve 25 are adjusted so that the temperature detected by the heating temperature thermistor 17 becomes the target hot water storage temperature (for example, 60 ° C.). The heating amount by the auxiliary heating unit 4 is adjusted.
[0037]
In this way, the hot water in the circulation path 3 is heated to the hot water storage set temperature by the heating unit 4 and the hot water is supplied from the upper part of the hot water storage tank 1 to form a temperature stratification in the hot water storage tank 1. It is configured to execute hot water storage processing for storing hot water.
[0038]
In the hot water supply operation, when an unshown hot water tap or the like is opened, or when a hot water filling command for filling the bathtub outside the figure is instructed, the hot water set temperature and hot water storage set by the hot water remote controller R2 or the like are set. Based on the detection information of the outlet thermistor 10 and the water supply thermistor 9, the opening of the mixing valve 8 is adjusted so that the temperature of the hot water to be supplied becomes the hot water supply set temperature, and the detection is performed based on the detection information of the mixing thermistor 12. By finely adjusting the opening of the mixing valve 8 based on the deviation between the temperature and the hot water supply set temperature, hot water at the hot water supply set temperature is supplied.
[0039]
When the hot water stored in the hot water storage tank 1 is being supplied, a determination process is performed to determine whether the heating condition is satisfied. When it is determined that the heating condition is satisfied, the hot water storage operation described above is performed. The hot water is stored in the hot water storage tank 1 and the opening of the mixing valve 8 is adjusted to supply the hot water to be stored.
[0040]
The discrimination process manages the current hot water storage amount in the hot water storage tank 1 based on the hot water supply amount of hot water supplied from the hot water storage tank 1 from the lowest detection timing when the hot water storage amount in the hot water storage tank 1 becomes the lowest detected hot water storage amount. When the current hot water storage amount is less than the minimum ensured amount, the heating condition is determined to be satisfied.
More specifically, when hot water stored in the hot water storage tank 1 is being supplied, the hot water storage tank 1 is detected from the detection information of the hot water supply thermistor 9, the hot water storage outlet thermistor 10, the mixing thermistor 12, and the hot water flow rate sensor 11. The amount of hot water for the hot water is obtained and integrated from the start of hot water supply until the lowest detection timing when the temperature of the hot water storage tank 1 is detected as a temperature lower than the hot water storage set temperature by the uppermost thermistor S1 and the hot water storage amount in the hot water storage tank 1 becomes the lowest detected hot water storage The amount of hot water is calculated.
Then, the hot water supply amount per unit time is calculated from the accumulated hot water supply amount, the hot water storage tank hot water supply amount is determined, and the current hot water storage amount in the hot water storage tank 1 is determined from the hot water storage tank hot water supply amount and the minimum detected hot water storage amount. When the current hot water storage amount is less than the minimum ensured amount, it is determined that the heating condition is satisfied.
[0041]
Incidentally, the mixing ratio of the hot water from the hot water storage tank 1 and the water from the mixing water supply channel 7 is obtained from the detected temperature of the water supply thermistor 9, the detected temperature of the hot water storage outlet thermistor 10, and the detected temperature of the mixing thermistor 12. The hot water supply amount of the hot water storage tank 1 is obtained from the ratio and the detected flow rate of the hot water supply flow rate sensor 11.
The hot water supply thermistor 9, the hot water storage outlet thermistor 10, the mixing thermistor 12, the hot water supply flow rate sensor 11, the hot water storage unit controller C, etc. constitute hot water supply amount detection means.
[0042]
In other words, the uppermost thermistor S1 detects the amount of hot water stored in the hot water storage tank 1 in a range smaller than the minimum detected hot water storage amount even though it can detect that the amount of hot water stored in the hot water storage tank 1 becomes the minimum detected hot water storage amount. Therefore, the hot water supply amount of the hot water storage tank 1 is obtained, and the current hot water storage amount of the hot water storage tank 1 in a range smaller than the minimum detected hot water storage amount is obtained from the hot water supply amount of the hot water storage tank and the minimum detected hot water storage amount. ing.
Then, by obtaining the current hot water storage amount of the hot water storage tank 1 that is smaller than the minimum detected hot water storage amount, the current hot water storage amount becomes less than the minimum secured amount that may cause hot water to run out if the hot water storage tank 1 does not store hot water. The hot water in the hot water storage tank 1 is supplied without operating the heating unit 4 or the like until the hot water storage amount in the hot water storage tank 1 reaches the minimum ensured amount.
[0043]
In the determination process, when the current hot water storage amount in the hot water storage tank 1 is managed, the current hot water storage amount is corrected to the small amount side based on the detection delay time when the lowest detection timing is detected by the uppermost thermistor S1. It is configured to manage with.
In other words, a detection delay time for detecting the lowest detection timing is generated between the time when the lowest detection timing is actually reached and the time when the lowest detection timing is detected by the uppermost thermistor S1. It will be.
Therefore, when the lowest detection timing is detected by the uppermost thermistor S1, the hot water storage amount of the hot water storage tank is reduced by the amount of the detection delay time compared to the time when the lowest detection timing is actually reached. The current hot water storage amount of the hot water storage tank 1 is obtained in a state where the current hot water storage amount is corrected to the small amount side by the decrease.
[0044]
In the determination process, the amount of stored hot water for determination larger than the minimum secured amount is determined based on the rise time from the start of the hot water storage operation by operating the heating unit 4 to the storage of hot water at the hot water storage set temperature. If the current hot water storage amount of the hot water storage tank 1 is less than the determination hot water storage amount, it is determined that the heating condition is satisfied.
In other words, the rise time is required from the time when the heating unit 4 is actually operated to start the hot water storage operation until the hot water at the hot water storage set temperature is stored in the hot water storage tank 1. If the hot water is longer, the amount of hot water for determination that is larger than the minimum secured amount is set, and even if the heating condition is satisfied and the hot water storage operation is started, the hot water at a desired temperature is started from the beginning of the hot water storage operation. It is configured to supply hot water.
[0045]
The discrimination process in the hot water supply operation will be described based on the flowchart of FIG.
First, when a hot water supply request is made, for example, when a hot water tap (not shown) is opened, hot water supply is started while the hot water stored in the hot water storage tank 1 is supplied by adjusting the opening of the mixing valve 8 or the like. The integrated hot water supply amount from is calculated (step 1).
Thereafter, when a temperature lower than the hot water set temperature is detected by the uppermost thermistor S1 and the hot water storage amount in the hot water storage tank 1 becomes the minimum detected hot water storage amount, the hot water storage tank is calculated from the calculated accumulated hot water supply amount and the minimum detected hot water storage amount. The current hot water storage amount of 1 is calculated (steps 2 and 3).
When the calculated hot water storage amount becomes the discrimination hot water storage amount, it is determined that the heating condition is satisfied, the hot water storage operation is started, hot water is stored in the hot water storage tank 1, and the stored hot water is supplied. (Steps 4 and 5).
[0046]
[Another embodiment]
(1) In the above embodiment, in the determination process, the hot water storage tank hot water supply amount is obtained based on the accumulated hot water supply amount from the start of hot water supply to the minimum detection timing. It is also possible to configure and implement such that the hot water storage tank hot water supply amount is obtained based on the instantaneous hot water supply amount such as the amount of hot water supply.
[0047]
In addition, the hot water supply amount of the hot water storage tank can be determined by integrating the hot water supply amount of the hot water storage tank 1 from the lowest detection timing, and the method for determining the hot water supply amount of the hot water storage tank can be appropriately changed.
[0048]
(2) In the above embodiment, a hot water storage amount for discrimination larger than the minimum secured amount is set based on the rise time from the start of the hot water storage operation until the hot water of the hot water storage set temperature is stored. In the example shown, it is determined that the heating condition is satisfied when the hot water storage amount is less than the discrimination hot water amount. It is also possible to configure and implement so as to determine that the above is satisfied.
[0049]
(3) In the above embodiment, when the current hot water storage amount in the hot water storage tank 1 is managed, the current hot water storage amount is reduced based on the detection delay time when the lowest detection timing is detected based on the detection information by the uppermost thermistor S1. However, it is also possible to carry out by managing the current hot water storage amount without performing such correction.
[0050]
(4) In the said embodiment, although the structure provided with the heat pump type heating part 19 and the auxiliary heating part 21 was shown as the heating part 4, what provided only the auxiliary heating part 21, or the heat pump type heating part 19 and the auxiliary heating part. In addition to 21, various heating means such as an exhaust heat utilization type heating unit that heats using the exhaust heat of the engine 36 can be applied.
[0051]
(5) In the above embodiment, the hot water storage type hot water supply apparatus according to the present invention is applied to the engine heat pump type air conditioning hot water supply system, but various hot water storage type hot water supply apparatuses such as those not equipped with a heat pump are applicable. Is possible.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hot water storage unit. FIG. 2 is a schematic configuration diagram of an engine heat pump type cooling and heating apparatus. FIG. 3 is a control block diagram of an engine heat pump type cooling and heating hot water system. Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water storage tank 4 Heating means 5 Water supply path 6 Hot water supply paths 9-12, C Hot water supply amount detection means C, D Operation control means E Hot water circulation means S1 Minimum detection hot water storage amount detection means

Claims (5)

A hot water storage tank with a hot water supply channel connected to the top and a water supply channel connected to the bottom;
Hot water circulating means for circulating hot water in a form in which the hot water taken out from the bottom of the hot water storage tank is heated by a heating means and then supplied to the upper part of the hot water storage tank;
An operation control means for controlling the operation of the heating means,
When the heating control condition is satisfied, the operation control means heats the hot water circulated by the hot water circulation means to hot water having a hot water storage set temperature by the heating means to form a temperature stratification in the hot water storage tank. A hot water storage type hot water supply device configured to supply hot water stored in the hot water storage tank through the hot water supply passage,
When the operation control means is supplying hot water in the hot water storage tank, the hot water in the hot water storage tank is discharged from the lowest detection timing at which the hot water storage amount in the hot water storage tank becomes a minimum detected hot water amount larger than the minimum secured amount. Based on the amount of hot water stored in the hot water storage tank, the amount of hot water stored in the hot water storage tank below the minimum detected hot water storage amount is managed, and when the amount of hot water stored is less than the minimum reserved amount, it is determined that the heating condition is satisfied. A hot water storage type hot water supply apparatus configured to execute a determination process. A minimum detected hot water storage amount detecting means for detecting the minimum detection timing at which the hot water storage amount in the hot water storage tank becomes the minimum detected hot water storage amount is provided;
When the operation control means manages the current hot water storage amount in the hot water storage tank, the current hot water storage is based on a detection delay time when detecting the lowest detection timing based on detection information by the lowest detected hot water storage amount detection means. The hot water storage type hot water supply apparatus according to claim 1, wherein the hot water storage type hot water supply apparatus is configured to be managed in a state where the amount is corrected to a small amount side. In the determination process, the operation control means sets a determination hot water storage amount larger than the minimum secured amount based on a rise time from when the heating means is operated until hot water at the hot water storage set temperature is obtained. The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein when the current hot water storage amount is less than the determination hot water storage amount, the heating condition is determined to be satisfied. A hot water supply amount detecting means for detecting the hot water supply amount of hot water in the hot water storage tank is provided,
When the operation control means manages the current hot water storage amount in the hot water storage tank, based on the accumulated hot water supply amount of hot water detected by the hot water supply detection means from the start of hot water supply until the minimum detection timing, The hot water storage type hot water supply apparatus according to any one of claims 1 to 3, wherein the hot water storage tank is configured to obtain a hot water supply amount. Hot water supply amount detection means for detecting the amount of hot water supplied to the hot water in the hot water storage tank is provided,
When the operation control means manages the current hot water storage amount in the hot water storage tank, the hot water storage tank hot water supply amount is determined based on the instantaneous hot water supply amount detected by the hot water supply amount detection means. The hot water storage type hot water supply apparatus according to any one of claims 1 to 3.

Images