JP3533799B2 - Water heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device having a structure in which a hot water outlet of a heat source of another heat source such as a solar water heater is connected to a water inlet side of a heat exchanger such as a gas water heater.

[0002]

2. Description of the Related Art Generally, when hot water is supplied directly from a water heater using another heat source such as a solar water heater to a curran or shower, the hot water temperature decreases as the amount of hot water increases and the desired hot water temperature is secured. Often difficult to do. Therefore, conventionally, for example, when the hot water temperature from the water heater is low, by connecting the hot water outlet side of the water heater of the other heat source to the water inlet side of the heat exchanger that constitutes the gas water heater, A hot water supply device is provided that is configured to reheat the gas hot water supply side to supply hot water, thereby always ensuring a desired hot water temperature and hot water supply amount and saving the gas combustion amount on the gas hot water supply side. (See, for example, Japanese Patent Application Laid-Open No. 1-118066).

However, in the summer, the temperature of the hot water from the water heater from other heat sources such as a solar water heater is high, for example, 50.
The temperature may exceed ℃, and if such a relatively high-temperature hot water is discharged from the water heater to the gas water heater side as it is, the hot water is heated in the heat exchanger as soon as the gas water heater side starts hot water combustion. Is boiled, which is extremely dangerous. for that reason,
In the prior art, when the temperature of the hot water from the water heater of the other heat source is equal to or higher than a preset reference temperature (for example, 50 ° C.), hot water supply combustion is not started from the viewpoint of the above boiling prevention. . However, even if the hot water temperature from the water heater by another heat source such as a solar water heater is lower than the above-mentioned reference temperature (50 ° C. in the above example) (for example, about 40 ° C.), the water heater to the gas water heater is used. When the amount of hot water flowing into the side is relatively small, when hot water supply combustion is started on the gas water heater side, the temperature of hot water discharged from the heat exchanger becomes high, and for example, it may exceed 55 ° C.

Therefore, the applicant has filed Japanese Patent Application No. 7-52604.
In order to prevent hot water from being directly discharged from the currant, etc. as described in No. 6, the hot water supply operation should be performed even if the temperature of the hot water from the water heater of the other heat source is lower than the preset reference temperature. It was proposed to stop the hot water supply operation and prevent the danger from occurring if it is expected that hot water will come out when the hot water is started.

Specifically, the minimum number (Gmi) of hot water supply capacity is based on the incoming water temperature (TC) and the incoming water amount (QC).
n), the outlet heated water temperature (THmin) is calculated by the following equation (1), and the calculated outlet heated water temperature (THmi) is calculated.
When n) is equal to or higher than the preset specified temperature (TK), the hot water supply operation is forcibly ended. THmin = {Gmin × 25 / QC} + TC (1) The capacity number G of the water heater is expressed by the following equation (2), where QG is the gas supply amount per unit time and I is the heat generation amount of each gas.
Can be obtained by G = QG × I × k (k: constant) (2)

[0006]

However, the minimum number (Gmin) of the hot water supply capacity used in the equation (1) is a standard value determined at the time of designing, and the minimum value of the hot water supply capacity of each water heater actually installed. The variation of the minimum number is not taken into consideration. This variation is largely due to the variation in the gas supply pressure to the gas burner and the variation in the calorific value of the supply gas itself.

The former variation in gas supply pressure is variation in secondary pressure. That is, the primary pressure that is the pressure of the gas pipe to the water heater is reduced in the water heater to adjust it to the secondary pressure that is the pressure that has passed through the combustion. A standard value and a tolerance are set for each type of gas used, and the gas is used within the tolerance. For this reason, even with water heaters of the same model and the same type of gas used, the secondary pressures of the individual water heaters are not all the same, and the secondary pressure when the water heater is at its minimum capacity is the standard value. Against, up and down 20%
Some have some degree of tolerance, and there are variations.

The latter variation of the heat generation amount of the supply gas itself is a difference between the standard heat generation amount of the gas group to which the supply gas belongs and the heat generation amount of the gas actually supplied. In other words, if the standard calorific value is set for each supplied gas, there will be no difference, but in order to implement it, the number of types of gas burners corresponding to each supplied gas will increase and management costs will increase. It's up, so it's not realistic.
Therefore, it is economical to produce a water heater for each gas group and use the water heater of the gas group to which the supply gas belongs. Therefore, depending on the supply gas included in a certain gas group, there are those with a calorific value smaller than the standard calorific value and those with a large calorific value, and there is generally a difference of ± 10% from the standard calorific value. is there.

As described above, there is a difference in the hot water supply capacity of the water heaters for each water heater, and in particular, when the variation in the minimum capacity is the largest with respect to the standard value, the secondary pressure is 120% (gas supply). The amount of heat generated by the gas is 110%, and the calorific value of the gas is 110%. When calculated by the formula (2), G = 120% × 110% = 132% (3), which may be as large as 30% or more.

Therefore, in the formula (1), for example, the incoming water temperature (TC) is 29 ° C. and the incoming water amount (QC) is 2.5 L /
The minimum number (Gmin) of standard hot water supply capacity is 2.
In case of No. 5, the outlet heated water temperature (THmin) is THmin = {2.5 × 25 / 2.5} + 29 = 54 ° C. (4), which is the temperature at which the hot water supply operation is forcibly ended (TK) If the temperature is 55 ° C, the hot water supply operation is continued. However, if the minimum number (Gmin) of the actual hot water supply capacity is not 2.5, but 2.5 × 132% = 3.3 as in the case of formula (3), the actual hot water discharge Temperature (TH
min) is THmin = {3.3 × 25 / 2.5} + 29 = 62 ° C (5), and the hot water supply operation is continued even though the specified temperature (TK = 55 ° C) is significantly exceeded. It is dangerous.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to prevent the occurrence of danger by preventing the situation where hot water is discharged from the currant as it is. It is an issue.

[0012]

In order to solve the above problems, the invention according to claim 1 uses a gas or the like as a heat source for heat exchange.
The heat exchanger has a water heater and the water inlet side of this heat exchanger and the water heater outlet of another heat source.
Amount of water entering the water heater connected to the hot water side and the heat exchanger
Water input amount detecting means for detecting the temperature, and the water input temperature of the heat exchanger
Of the incoming water temperature detecting means for detecting the
Water flow determining means for determining the presence or absence of water flow based on the detection signal
When the water flow determining means determines that water is flowing,
Hot water supply operation starting means for starting the hot water supply operation of the water heater
And the water amount detected by the water amount detecting means and the water amount
The incoming water temperature detected by the temperature detection means and the preset maximum
Based on a predetermined calculation formula using a small combustion capacity, the minimum
When the water heater burns with the combustion capacity of
Hot water temperature calculation means for calculating the temperature of hot water discharged from the exchanger
And the hot water temperature calculated by the hot water calculation means is preset.
Determination means for determining whether or not the temperature exceeds the specified temperature
And the outlet temperature is below the specified temperature by the determining means.
When it is determined that the temperature is higher, the hot water supply operation starting means
Forcibly terminate the hot water supply operation of the water heater that has started
A hot water supply apparatus comprising:
The minimum burning capacity determined by the design is the minimum burning capacity.
Change the burning capacity of the heat exchanger to the standard value of the burning capacity.
Set a value that is multiplied by a predetermined correction coefficient that is larger than 1
It is characterized by being. The water heater
In, the hot water temperature for detecting the hot water temperature of the heat exchanger
The detection means and the hot water supply device are actually operated by hot water
Water amount means, said incoming water temperature detecting means and said hot water temperature detection
Water input to the heat exchanger, water temperature and
The actual minimum fuel consumption can be
Minimum combustion capacity calculation means for calculating the burning capacity, and the minimum combustion capacity
The actual minimum combustion capacity calculated by the burning capacity calculation means and
The comparison means for comparing with the minimum burning capacity,
Depending on the stage, the actual minimum burning capacity is
If it is less than
Actual minimum burning capacity calculated by minimum burning capacity calculation means
You may further comprise the change means to change into force (Claims)
2).

The invention according to claim 3 heats gas or the like with heat.
It has a heat exchanger as a source, and the water input side of this heat exchanger and other heat
The water heater connected to the hot water outlet side of the source water heater and the heat exchanger
A water input amount detecting means for detecting the amount of water input to the exchanger, and the heat exchanger.
An input water temperature detecting means for detecting the input water temperature of the exchanger;
Hot water temperature detecting means for detecting hot water temperature of the exchanger;
Determines the presence or absence of water flow based on the detection signal from the water input detection means
There is water passing by the water passing judging means and the water passing judging means.
If it is determined that the hot water supply operation of the water heater is started
The hot water operation starting means and the water entering amount detected by the water entering amount detecting means.
Water volume and water temperature detected by the water temperature detection means
To a predetermined formula using the minimum combustion capacity set for
Therefore, the water heater was burned with the minimum burning capacity.
Occasionally hot water that calculates the temperature of hot water discharged from the heat exchanger
Temperature calculation means and hot water temperature calculated by the hot water calculation means
To determine whether the temperature exceeds a preset specified temperature
Determining means, and the outlet temperature is determined by the determining means.
When it is determined that the temperature exceeds the specified temperature, the hot water supply operation starts
Force the hot water supply operation of the water heater started by means
A hot water supply device equipped with a hot water supply operation ending means for ending
And, as the minimum burning capacity, the water heater is actually
The hot water supply operation is performed, and the water input amount means and the water input temperature detection means
And to the heat exchanger detected by the outlet temperature detecting means
Predetermined arithmetic expression using the amount of incoming water, incoming water temperature, and outgoing hot water temperature
The actual minimum burning capacity calculated by
It is characterized by that.

[0014]

1 is a system configuration diagram of a hot water supply apparatus according to an embodiment of the present invention. Hot water supply apparatus 1 of this embodiment
Is configured by combining a gas water heater 2 using gas as a heat source and a solar water heater 4 using solar heat as a heat source. The gas water heater 2 includes a heating mechanism section 6, a controller section 8, and a remote controller section 10.

The heating mechanism 6 has a water inlet 14 connected to the upstream side of the heat exchanger 12 and a hot water outlet 16 connected to the downstream thereof. The water inlet 14 is connected to a solar water heater via a water channel switching valve 18. 4 is connected to the hot water outlet side, while the hot water discharge passage 16 is connected to the currant 20 and a shower (not shown). A water supply 22 is further connected to the waterway switching valve 18. A water temperature sensor 24 for detecting a water temperature TC and a water amount sensor 26 for detecting a water amount QC are provided in the middle of the water inlet path 14, and hot water from the heat exchanger 12 is discharged in the hot water path 16. Hot water temperature sensor 2 for detecting temperature
8 are provided respectively. Further, a gas burner 30 for heating the heat exchanger 12 is arranged for the heat exchanger 12, and a gas proportional valve 34 and a solenoid valve 36 are provided in the middle of a gas pipe 32 connected to the gas burner 30. ing.

On the other hand, the controller section 8 is composed of a microcomputer or the like, and includes a sequence control means 40, a hot water temperature calculation means 42, and a hot water supply operation ending means 44. The sequence control means 40 determines the hot water temperature obtained by heating the heat exchanger 12 based on the incoming water temperature TC detected by the incoming water temperature sensor 24 and the incoming water amount QC detected by the incoming water amount sensor 26. The feed opening control of the gas combustion amount of the gas burner 30 is performed by adjusting the opening of the gas proportional valve 34 so that the preset temperature TS is set in advance, and the tapping temperature TH detected by the tapping temperature sensor 28 and the above When the set temperature TS of the two does not match, the tapping temperature T based on the deviation between the TH and TS
The opening of the gas proportional valve 34 is adjusted so that H matches the set temperature TS, and the gas combustion amount is feedback-controlled. Further, the sequence control means 40
The temperature of the hot water from the solar water heater 4 detected by the incoming water temperature sensor 24 is a preset reference temperature (50 in this case).
When the temperature is higher than or equal to (° C.), the hot water supply operation is not started.

The outlet hot water temperature calculating means 42 is provided with the incoming water temperature TC detected by the incoming water temperature sensor 24 and the incoming water amount sensor 26.
The hot water outlet temperature THmin when the heat exchanger 12 is heated with the minimum capacity is calculated on the basis of the amount of water input QC detected in. In this case, the above-mentioned formula (1) is the basic form for calculating the tapping temperature THmin. Hot water supply operation ending means 4
4 is the hot water temperature calculated by the hot water temperature calculation means 42.
The hot water discharge operation is forcibly stopped when the temperature exceeds a preset specified temperature. Here, as the above-mentioned specified temperature, the set temperature TS is the tentacle temperature TJ (48 in this example).
C.) or lower, a constant temperature TK (55.degree. C. in this example) is set. Further, the set temperature TS is the tentacle temperature TJ (= 48
If it is higher than (° C.), TS + α (α is a constant, for example, 5 ° C.) is set. Furthermore, the remote controller 10
An operation switch for setting the hot water supply operation mode, a setting switch for setting a desired temperature TS for hot water supply (all not shown), and the like are provided, and a command signal corresponding to each switch operation is given to the controller unit 8. It is designed to be used.

Next, referring to the flow chart shown in FIG. 2, the operation of the hot water supply apparatus 1 having the above-described structure, particularly the control operation when the hot water outlet temperature becomes much higher than the set temperature and a danger occurs, will be described. explain. First, the remote control unit 10
Is operated to set an operation mode in which the solar water heater 4 is also used, the sequence control means 4 of the controller unit 8 is set.
0 switches the water channel switching valve 18 so that the hot water from the solar water heater 4 is communicated with the water inlet 14 of the gas water heater 2. Then, it is determined whether or not the incoming water temperature TC detected by the incoming water temperature sensor 24 is equal to or higher than a preset reference temperature (here, 50 ° C.) (step 1). When the incoming water temperature TC is 50 ° C. or higher, which is the reference temperature, the solar water heater 4
It is considered that the temperature of the hot water is sufficient, and when such relatively hot water enters the gas water heater 2 side as it is and starts hot water combustion, the hot water boils in the heat exchanger 12, which is extremely dangerous. It becomes a state. Therefore, in this case, the hot-water supply combustion is not started and the process waits. On the other hand, when the incoming water temperature TC is less than 50 ° C. which is the reference temperature, there is no fear of boiling in the heat exchanger 12, so the sequence control means 40 next detects the incoming water amount sensor 26 from the incoming water amount sensor 26. The presence or absence of water flow is determined based on the detection signal (step 2), and if there is water flow, it is determined that the Karan 20 or the like has been opened, and hot water supply combustion is started (step 3).

In the hot water supply combustion, the outlet hot water temperature TH is controlled based on the incoming water temperature TC detected by the incoming water temperature sensor 24 and the incoming water amount QC detected by the incoming water amount sensor 26.
The amount of gas burned by the gas burner 30 is feedforward controlled by adjusting the opening of the gas proportional valve 34 so that the preset temperature TS is set to 0. Further, when the hot water outlet temperature TH detected by the hot water outlet temperature sensor 28 after a certain period of time and the set temperature TS do not match, the hot water outlet temperature TH matches the set temperature TS based on the deviation between both TH and TS. The opening of the gas proportional valve 34 is adjusted so that the gas combustion amount is feedback-controlled.

Further, in the sequence control means 40, the set temperature TS preset by the remote controller 10 is the tentacle temperature T.
It is determined whether the temperature is J or less than 48 ° C. (step 4).
The set temperature TS is 48 ° C or lower than the tentacle temperature TJ (TJ ≧ T
In the case of S), it is assumed that the hot water discharged from the gas water heater 2 is used as it is without mixing the hot water with the Karan 20 or the like. Therefore, the outlet heated water temperature calculation means 42
Based on the incoming water temperature TC detected by the incoming water temperature sensor 24 and the incoming water amount QC detected by the incoming water amount sensor 26, the outlet heated water temperature THm when the heat exchanger 12 is heated with the minimum capacity
In is calculated based on the following equation (6) (step 5). THmin = {(Gmin × a × b) × 25 / QC} + TC (6) Here, Gmin is the lowest number of hot water supply capacity set as the standard value of the gas water heater 2. Also, a and b are
A correction coefficient of Gmin, where a is the ratio of the upper limit value of the gas supply pressure (secondary pressure) at the lowest number to the standard value, and b is the maximum calorific value of the gas itself in the gas group to which the supply gas belongs. Is the ratio of the standard value of
Usually, a is around 1.05 to 1.2 and b is 1.05 to 1.1.
It is in the vicinity. In this way, by multiplying by the correction factors a and b, by adding the type of gas that uses the lowest number of hot water supply capacity or the increase due to the secondary pressure adjustment error,
It is possible to obtain the maximum value of the hot water discharge temperature THmin, prevent hot water from flowing out even higher than in the past, and improve safety.

Subsequently, the hot water supply operation terminating means 44 has the hot water discharge temperature THmin calculated by the hot water discharge temperature calculating means 42.
, It is determined whether or not the temperature exceeds a preset specified temperature TK (here, 55 ° C.) (step 6). The hot water temperature THmin obtained by the hot water temperature calculation means 42 is the specified temperature TK.
In the case of 55 ° C. or higher, if hot water of this temperature is directly discharged to the calan 20 or the like, there is a danger of being burned, which is dangerous. Therefore, the hot water supply operation ending means 44 closes the solenoid valve 36 and the gas burner 30. The hot water supply combustion by the above is finished (step 11), and further, it is judged whether or not the water flow is stopped based on the detection output of the water amount sensor 14 (step 1).
2). Then, if the water flow is continued, the process returns to step 4, and if the water flow is stopped, the operation is ended. Also,
In step 6, the tap water temperature THmin is equal to the specified temperature TK.
If the temperature is less than 55 ° C., it is considered that the risk is low even if this hot water is directly discharged to the curran 20 or the like.
The hot water discharge operation ending means 44 does not operate, and the sequence control means 40 determines whether or not the water flow is stopped based on the detection output of the water input sensor 26 (step 7). And
If the water flow is continued, the process returns to step 3 and the hot water supply combustion is continued. On the contrary, if the water flow is stopped in step 7, the electromagnetic valve 36 is closed and the hot water combustion by the gas burner 30 is ended (step 8), and the operation is ended.

In step 6, the hot water outlet temperature TH
When min is near the specified temperature TK, step 6 → 11
→ 12 → 4 → 5 → 6 → 7 → 3 → 4 → 5 → 6 → 11 and until the water flow rate sensor 14 determines that water flow has stopped, step 11 of hot water supply combustion end and step 3 of hot water supply combustion start are repeated, It is possible that the actual tap water temperature is not stable. The specified temperature TK may be changed in order to prevent repetition of the end of hot water supply combustion and the start of hot water supply combustion. That is, when step 6 is reached for the first time, for example, TK =
55 ℃, lower than 55 ℃ when more than 2 times, TK
= 52 ° C. or higher than 55 ° C. and TK = 56 ° C. In this way, the tap water temperature THmin
Is close to the specified temperature TK (= 55 ° C.), the specified temperature TK is changed to a temperature other than 55 ° C. Therefore, it is possible to prevent the actual hot water outlet temperature from becoming unstable due to repetition of the end and start of the hot water supply combustion.

On the other hand, in step 4, the set temperature TS
Is higher than the tentacle temperature TJ of 48 ° C., it is assumed that hot water is mixed in the currant 20, and the risk is considered to be less than that in the case where hot water is not mixed. Therefore, the outlet hot water temperature calculation means 42 is based on the incoming water temperature TC detected by the incoming water temperature sensor 24 and the incoming water amount QC detected by the incoming water amount sensor 26, and has the minimum capacity.
The hot water outlet temperature THmin in the case of heating is calculated based on the above equation (6) (step 9).

Then, the calculated hot water temperature THmi
It is determined whether or not n exceeds a specified temperature (TS + α) ° C. [α is a fixed value (for example, 5 ° C.) with a margin of variation in the tapping temperature TH] (step 10). When the calculated hot water discharge temperature THmin is lower than the specified temperature (TS + α) ° C, it is assumed that the hot water is mixed in the calan 20, and the risk is lower. Can be considered. Therefore, in this case, the hot water supply operation terminating means 44 does not operate, and the sequence control means 40 determines whether or not the water flow is stopped based on the detection output of the water input amount sensor 26 (step 7). If the water continues,
Returning to step 3, the hot water supply combustion is continued. On the other hand, in step 10, when the outlet heated water temperature THmin obtained by the outlet heated water temperature calculation means 42 is equal to or higher than the specified temperature (TS + α) ° C., hot water is generated in the heat exchanger 12 on the gas water heater 2 side. Since there is a possibility of boiling, the hot water supply operation ending means 4
In step 4, the solenoid valve 36 is closed and the hot water combustion by the gas burner 30 is completed (step 11).

As described above, in this embodiment, when the temperature of the hot water entering the gas water heater 2 from the solar water heater 4 is lower than the reference temperature (50 ° C. in this example) set from the viewpoint of boiling prevention. Even if there is a possibility that high-temperature hot water discharge will occur if hot water supply combustion is started, hot water supply combustion is forcibly ended, so that it is possible to prevent danger from occurring. In the above description, in calculating the tap water temperature THmin, the correction coefficients a and b are multiplied in consideration of the difference in the secondary pressure adjustment error and the calorific value of the gas used. The measurement error of the sensor 24, the measurement error of the water input sensor 26, the heat absorption rate (heat efficiency) of the heat exchanger 12 with respect to the heat generation amount of the gas burner 30, and the like may be taken into consideration.

[0026]

[Modification] In the embodiment of the invention described above, step 5,
Using the equation (6) for the calculation of step 9, the tap water temperature THmi
The maximum possible value of n is determined, and this is used in step 6 and step 10 for the specified temperature TK or the set temperature TS.
It was made to compare with + α. In this modified example, the equation (1) is used in the calculation of the hot water outlet temperature THmin as in the conventional case, but the difference is that the minimum number Gmin of hot water supply capacity is obtained by learning. Minimum number of learning Gmin
In the sequence control means 40 of the controller unit 8, s indicates the hot water supply temperature TH, the incoming water temperature TC and the incoming water amount QC when the hot water supply combustion with the minimum capacity is instructed and stabilized after a predetermined time elapses. Sensor 24
Also, if the water amount sensor 26 is used for measurement, it can be calculated by the following equation (7). Gmins = (TH-TC) × QC / 25 (7)

Then, the minimum number Gmi obtained by the equation (7)
If ns is used in the equation (1), the hot water outlet temperature THmin can be calculated according to the characteristics of each water heater, and the determinations in step 6 and step 10 can be made accurately, so that high temperature hot water is prevented as in the embodiment of the invention. And improve safety. Further, in the embodiment of the invention, there is a difference between the actual outlet heated water temperature and the calculated outlet heated water temperature THmin. Therefore, the actual outlet temperature is the specified temperature TK.
Is less than or less than the set temperature TS + α and there is no problem even if the combustion is continued, the calculated hot water discharge temperature THmin is equal to or higher than the specified temperature TK or is equal to or higher than the set temperature TS + α. End (step 11), and the usability may be impaired. However, by adopting the minimum number Gmins based on the learning value, the tap water temperature THmin according to the characteristics of each water heater can be calculated, and there is no difference from the tap water temperature at the actual minimum capacity, and accurate control is possible. It will be possible. However, the learning value Gmi
When ns is largely deviated from the standard value Gmin (for example, 50%), the secondary pressure, the gas proportional valve 34, or the like may be abnormal, so the learned value is not adopted and the hot water supply operation is stopped, etc. Perform safe operation.

The time when the minimum number Gmins is learned may be any time, and the time is not limited. For example, when performing the inspection during the factory production process or the trial operation after the installation, forcibly instructing the hot water supply combustion with the minimum capacity, obtaining the minimum number Gmins, and setting it in the hot water temperature calculation means 42 from the beginning. Of. Further, when the set minimum number Gmins disappears due to a power outage or repair, the hot water supply combustion is forcibly instructed again to obtain the minimum number Gmins, and the outlet hot water temperature calculating means 42 is obtained.
Set it again to. Or, initially, the minimum number is Gmi
ns is a standard value or a value larger than the standard value is provisionally set in the hot water temperature calculating means 42, and the minimum number Gmins is calculated when the sequence control means 40 instructs hot water supply combustion with the minimum capacity during normal operation. , Hot water temperature calculation means 42
It is also possible to rewrite the minimum number Gmins provisionally set to.

At the beginning, the minimum number Gmins is set to a standard value or a value larger than the standard value temporarily in the hot water outlet temperature calculating means 42, and the output number is always calculated and set temporarily during actual hot water combustion. The minimum number Gmins may be rewritten when a value smaller than the minimum number Gmins is detected. The minimum number Gmins is not limited to being rewritten once, and may be rewritten when a value smaller than the rewritten minimum number Gmins is detected, or may be repeated.

[0030]

According to the present invention, the following effects can be obtained. (1) According to the invention of claim 1, the hot water outlet temperature when the heat exchanger is heated with the minimum capacity is calculated higher based on the hot water temperature and the hot water amount, and the hot water temperature is preset. When the temperature exceeds the specified temperature, the hot water supply operation is forcibly ended, so the hot water supply temperature calculated as in the past is below the specified temperature, and the hot water supply operation is continued, The actual hot water temperature does not exceed the specified temperature, and it is possible to prevent the risk of burns from occurring in advance.

(2) Further, in the inventions described in claims 2 and 3, as in the invention described in claim 1, it is possible to prevent the occurrence of danger such as burns from occurring in a reliable manner. Also, by learning the actual minimum capacity in each water heater, the hot water temperature at the minimum capacity is calculated.
The difference from the actual driving becomes smaller or disappears. As a result, the actual hot water discharge temperature is lower than the specified temperature with a margin, and although the hot water supply operation is in a state in which there is no problem, the calculated hot water discharge temperature is higher than the specified temperature and the hot water supply operation is terminated. There is no case, and therefore usability is not impaired.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a hot water supply device according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the hot water supply device in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water heater, 2 ... Gas water heater, 4 ... Solar water heater, 6 ... Heating mechanism part, 8 ... Controller part, 12 ... Heat exchanger, 14 ... Inlet, 16 ...
・ Outlet channel, 24 ... Inlet temperature sensor, 26 ... Inlet amount sensor, 28 ... Outlet temperature sensor, 30 ... Gas burner, 40 ... Sequence control means, 42 ... Outlet temperature calculation means , 44 ... Means for ending hot water supply operation.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisato Kataoka, 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo In Noritsu Co., Ltd. (56) Reference JP-A-6-236203 (JP, A) −100053 (JP, U) Actually opened 63-22555 (JP, U) Actually opened 62-105455 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24H 1/10

Claims (3)

(57) [Claims] 1. A heat exchanger having a gas or the like as a heat source ,
The water inlet side of the heat exchanger and the hot water outlet side of the other heat source are connected
Hot water supply device, water input amount detecting means for detecting the water input amount to the heat exchanger, and water input temperature detecting means for detecting the water input temperature of the heat exchanger
And the presence or absence of water flow based on the detection signal of the water amount detection means.
The water flow determining means for determining, and when the water flow determining means determines that there is water flow, the
Hot water supply operation start means for starting the hot water supply operation of the water heater, the amount of water input detected by the water input amount detection means, and the water input temperature
The incoming water temperature detected by the detection means and the preset minimum
Using the combustion capacity and a predetermined calculation formula,
The heat exchanger when the hot water heater is burned by the burning capacity.
The hot water temperature calculating means for calculating the temperature discharged from the hot water is preset and the hot water temperature calculated by the hot water calculating means is preset.
Determination means for determining whether or not the temperature exceeds the specified temperature, and the outlet temperature is determined to be equal to or higher than the specified temperature by the determination means.
If it is determined that the hot water supply operation start means
Water supply forcibly ending the hot water supply operation of the specified water heater
In the hot water supply apparatus including the operation ending means, the minimum combustion capacity is the minimum determined by design.
Of the combustion capacity of the heat exchanger to the standard value of the combustion capacity of
The value multiplied by a predetermined correction coefficient greater than 1
Hot water supply device characterized by being set . 2. The hot water supply apparatus according to claim 1, wherein the hot water outlet temperature detecting means detects the hot water outlet temperature of the heat exchanger.
If, before actually to hot water supply operation of the water heater fill water volume means, before
It is detected by the filling water temperature detecting means and the hot water temperature detecting means.
The amount of water entering the heat exchanger
Calculate the actual minimum combustion capacity using a predetermined calculation formula
Minimum combustion capacity calculating means and the actual minimum fuel capacity calculated by the minimum combustion capacity calculating means.
Comparing means for comparing the burning capacity and the minimum burning capacity, and the actual minimum burning capacity by the comparing means is the minimum
Preset minimum combustion when less than combustion capacity
Capacity is the actual maximum calculated by the minimum combustion capacity calculation means.
A hot water supply apparatus further comprising a changing means for changing to a small combustion capacity . 3. A heat exchanger having a gas or the like as a heat source ,
The water inlet side of the heat exchanger and the hot water outlet side of the other heat source are connected
Hot water supply device , water input amount detecting means for detecting the water input amount to the heat exchanger, and water input temperature detecting means for detecting the water input temperature of the heat exchanger
And an outlet heated water temperature detecting means for detecting the outlet heated water temperature of the heat exchanger
And the presence or absence of water flow based on the detection signal of the water amount detection means.
The water flow determining means for determining, and when the water flow determining means determines that there is water flow, the
Hot water supply operation start means for starting the hot water supply operation of the water heater, the amount of water input detected by the water input amount detection means, and the water input temperature
The incoming water temperature detected by the detection means and the preset minimum
Using the combustion capacity and a predetermined calculation formula,
The heat exchanger when the hot water heater is burned by the burning capacity.
The hot water temperature calculating means for calculating the temperature discharged from the hot water is preset and the hot water temperature calculated by the hot water calculating means is preset.
Determination means for determining whether or not the temperature exceeds the specified temperature, and the outlet temperature is determined to be equal to or higher than the specified temperature by the determination means.
If it is determined that the hot water supply operation start means
Water supply forcibly ending the hot water supply operation of the specified water heater
In a hot water supply device provided with an operation termination means, the hot water supply device is actually used as the minimum combustion capacity.
The water flow rate means, the water temperature detection means and the front
Water entering the heat exchanger detected by the hot water temperature detection means
Using a predetermined calculation formula using the amount, inlet water temperature and outlet water temperature
A combustion device characterized in that the calculated minimum actual combustion capacity is set .