JP2003139395A - Solar hot-water supplier with trial operation function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar hot-water supplier with a trial operation function in which gas secondary pressure of an auxiliary heat source (gas instantaneous water heater) can be easily adjusted and failure to return to the original state after adjustment can be prevented. SOLUTION: In this solar hot-water supplier 30 comprising a solar-heat water heater 1 having a hot-water tank 4, a hot-water/water mixing device 5 for mixing hot water from the hot-water tank 4 and water supply from a branch pipe 22 and a first control part 6 and the auxiliary heat source 11 having a heat exchanger 13 connected to its post-flow, a combustion part 12 and a second control part 14, a trial operation function is added to it, and in the trial operation mode, a mixing ratio in the hot-water/water mixing device 5 is automatically adjusted at the hot-water/water mixing device 5 so that water supply from the branch pipe 22 is 100% and a hot-water amount from the hot-water tank 4 is zero, and the secondary pressure of a heat-source gas of the auxiliary heat source 11 can be adjusted manually under the condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar water heater with a built-in auxiliary heat source and a trial run function.

[0002]

2. Description of the Related Art Generally used gas instantaneous water heaters automatically adjust the amount of combustion gas according to a desired hot water supply temperature (set temperature) with a proportional valve for adjusting the gas flow rate built in the gas instantaneous water heater. There are many methods (proportional combustion method) which require the adjustment of the minimum secondary pressure and the maximum secondary pressure of the heat source gas, and the adjustment (control) between the proportional valve for adjusting the gas flow rate and the control unit. Further, a solar water heater with a built-in auxiliary heat source, in which the gas instantaneous water heater is connected after the solar water heater, has been conventionally known. When performing the above-mentioned minimum secondary pressure and maximum secondary pressure adjustment work with such an auxiliary heat source built-in solar water heater, it is necessary to perform it in a state in which the gas instantaneous water heater is burning, Up to 2 of gas
When adjusting the secondary pressure, an abnormal overheating state was often caused, and the secondary gas pressure could not be adjusted. In order to avoid such a situation, conventionally, the hot water side pipe to the gas instantaneous water heater is manually closed, the bypass water supply side pipe on the solar water heater side is manually opened, and water is supplied to the gas instantaneous water heater (100%). Water is supplied) and adjustment work is performed.

[0003]

However, such an adjusting operation is manually cumbersome, and it may happen that the operator forgets to return to the original state after the adjusting operation. The present invention solves such a problem, that is, the secondary gas pressure of the gas instantaneous water heater, which is an auxiliary heat source device, can be easily adjusted, and it is possible to return to the original state after the adjustment work. It is to provide a solar water heater with a trial run function.

[0004]

In order to achieve the above object, the present invention has the following constitution. That is, the present invention relates to a solar water heater 1 having a hot water storage tank 4, a hot and cold water mixing device 5 for mixing hot water from the hot water storage tank 4 and feed water from a branch pipe 22, and a control unit (first control unit) 6. A solar water heater 30 comprising a heat exchanger 13, a combustion unit 12, and an auxiliary heat source unit 11 having a control unit (second control unit) 14 connected to a subsequent flow, and a trial operation function is attached to the solar water heater 30 to perform a trial operation mode. Then, the mixing ratio in the hot and cold water mixing apparatus 5 is automatically adjusted by the hot and cold water mixing apparatus 5 so that the amount of hot water supplied from the branch pipe 22 is 100% and the amount of hot water from the hot water storage tank 4 becomes zero. The solar water heater 30 is characterized in that the secondary pressure of the heat source gas of the heat source device 11 can be adjusted. Here, the trial operation switching unit 7 is usually
It can be provided in any one of the control units 6/14 or the remote control unit 15 connected to them.
Further, the adjustment of the hot water mixing device 5 is usually performed by adjusting the opening degree of the mixing valve built in the hot water mixing device 5. Further, the secondary pressure of the heat source gas of the auxiliary heat source device 11 is usually adjusted manually.

It is preferable that the solar water heater has the following structure. That is, (on the solar water heater side), the hot water storage tank 4 has a thermometer 2 for measuring hot water temperature (Th).
3 is provided, a flow meter 24 for measuring the mixed hot water flow rate (Q) is provided downstream of the hot and cold water mixing device 5, and a water flow detector 16 and a temperature are provided upstream of the heat exchanger 13 (on the auxiliary heat source side). A total of 17 are arranged, and a trial run switching unit (a kind of button, switch) 7 is provided in the first control unit 6 or the second control unit 14 (or a remote control unit 15 connected to these), and a trial run is provided. In the mode, the mixing ratio in the hot and cold water mixing device 5 is automatically adjusted so that the amount of water supplied from the branch pipe 22 is 100% and the amount of hot water from the hot water storage tank 4 is zero, and under the conditions, the auxiliary heat source device 11 is used. The secondary pressure of the heat source gas of can be adjusted (manually), and in the normal operation mode,
When Th is equal to or higher than the desired hot water supply temperature (TR), the hot water mixing device 5 is adjusted on the solar water heater side with TR as the control temperature on the condition that the combustion unit 12 of the auxiliary heat source device 11 is stopped, and the outlet side thereof is adjusted. When the hot water temperature is controlled and Th is less than TR, the hot water mixing apparatus 5 is adjusted by adjusting the temperature rising portion (α) by the condition that the combustion unit 12 is operated on the auxiliary heat source side. It is a solar water heater whose outlet side hot water temperature is controlled. The thermometer 17 arranged upstream of the heat exchanger 13 on the auxiliary heat source side may be arranged downstream of the heat exchanger 13.

In the solar water heater, a timer for measuring the duration of the trial run is attached to the solar water heater, and when the trial run duration exceeds a predetermined time, the "trial run" is automatically returned to the "normal run". More preferably.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, in the solar water heater of the present invention, the auxiliary heat source of the solar water heater is composed of the solar water heater and the auxiliary heat source device connected to the outlet side of the solar water heater. When adjusting the secondary pressure of the heat source gas, a trial run switching unit (buttons or switches) is provided in the control unit of the solar water heater,
In the "test run" mode, the mixing ratio in the hot water mixing device 5 on the solar water heater side is 10 when the water supplied from the branch pipe 22 is 10%.
The hot and cold water mixing device 5 is automatically (forced) adjusted so that the amount of hot water from the hot water storage tank 4 becomes zero at 0%, and the secondary pressure of the heat source gas of the auxiliary heat source device (usually manually ) Adjust.

The present invention will be described below more specifically with reference to the accompanying drawings. FIG. 1 is an example (configuration diagram) of a solar water heater with a built-in auxiliary heat source according to the present invention. The water (or antifreeze liquid) heated by the heat collector 10 installed on the roof or the like is forcedly circulated in the closed circulation path by the forced circulation pump 3, and is heat-exchanged by the heat exchanger 2 in the hot water storage tank 4 to store hot water. The water in the tank 4 is indirectly heated. The hot water temperature of the hot water storage tank 4 is measured by the thermometer 23. The hot water discharged from the hot water storage tank 4 is diluted and mixed by the hot water mixing device 5 via the first control unit 6 (that is, the opening degree of the mixing valve built in the hot water mixing device 5 is adjusted).
After being appropriately mixed with water from the branch pipe 22, the mixed water is supplied from the mixed hot water outlet 8 to the auxiliary heat source device 11. At this time, the flow rate of the mixed hot water is measured by the flow meter 24 arranged downstream of the hot water mixing device 5. Further, a trial run changeover switch 7 is arranged in the first control unit 6.

On the side of the auxiliary heat source 11, the supplied hot water enters from the hot water inlet 20, passes through the water flow detector 16, the pipe line in which the thermometer 17 is arranged, and the heat exchanger 13, and exits from the hot water outlet 21. Although not shown, the hot water outlet 21 is divided into bathtub filling, hot water supply for bathroom shower, hot water supply for kitchen, hot water supply for washroom, etc. (branch end pipe line) The temperature can be different.

The control unit of the solar water heater 30 will be described. Remote control unit (remote control) for setting hot water supply temperature 1
5 is connected to the second control unit 14 via a remote control code 18, and the second control unit 14 controls the remote control code 19
Is connected to the first control unit 6 on the solar water heater side. The desired hot water supply temperature (set temperature; TR) set by the remote controller 15 is controlled not only by the second control unit 14 on the auxiliary heat source device side but also by the first control unit on the solar water heater side via the second control unit 14. It is also transmitted to the section 6. As a result, even on the solar water heater side, the user wants to supply hot water (that is, set temperature:
TR) can be recognized. The data communication from the remote controller 15 to the first control unit 6 via the second control unit 14 may be performed by connecting the cords on the same communication line to directly receive the data.

The control of the hot water temperature during normal operation of the solar water heater (particularly, the control of the hot water temperature on the solar water heater side) is performed when the hot water temperature (Th) of the hot water storage tank is equal to or higher than TR, or when it is lower than TR. Distinguish with. FIG. 2 shows the temperature control (flow chart) of the solar water heater during normal operation in the present invention. Next, the temperature control during normal operation in the present invention will be described with reference to FIG.

On the solar water heater side, when the hot water temperature (Th) of the hot water storage tank is equal to or higher than the desired hot water supply temperature (TR), the hot water mixing device 5 dilutes the water so that the outlet hot water temperature becomes TR. , To the auxiliary heat source side. in this case,
The auxiliary heat source device 11 does not heat further. The hot water will be supplied as it is.

When the hot water temperature (Th) of the hot water storage tank is lower than the desired hot water supply temperature (TR), the solar water heater side expects a temperature increase (α) due to combustion in the auxiliary heat source device 11, The temperature (Th) is lowered to TR-α and then supplied to the auxiliary heat source side. Here, α is (H × 25) ÷ Q
(However, H is the number of the heating capacity lower limit of the auxiliary heat source device, and Q is the mixed hot water flow rate (L / min).) For example, when the hot water temperature (Th) of the hot water storage tank 4 is 40 ° C., the desired hot water supply temperature (set temperature; TR) is 42 ° C., H is No. 3, Q is 5 liters per minute, and α is (3 × 25). ÷ 5 = 15, and the control temperature in the hot and cold water mixing device 5 is 42−15 = 2.
Calculated as 7 ° C. Therefore, hot water (40 ° C.) from the hot water storage tank 4 and feed water from the branch pipe 22 are mixed in the hot and cold water mixing device 5 so that the temperature of the outlet side thereof becomes 27 ° C., and the hot water is fed to the auxiliary heat source side. Will be supplied. In this way, hot water that matches the desired temperature (set temperature; TR) is supplied from the end outlet of the solar water heater.

Prior to the "normal operation", the "test operation"
Carry out. FIG. 3 is a flowchart of the temperature control of the solar water heater during the trial run.

The "test run" will be described below. When the trial run switching unit (buttons, switches, etc.) 7 provided in the first control unit 6 is pushed down, the solar water heater enters the "trial run" mode, and the indicator lamp (as a display unit, a small, low power consumption LED is displayed). Desirable) lights up. From this, it is easy to see that the solar water heater is in the trial run state. Here, the switching unit may be devised so as not to shift to the “test driving” mode by inadvertently pressing the trial driving switching unit. For example, when the switch is continuously pressed for a predetermined time, the “test drive” mode is first set. When in the "trial run" mode, the "trial run function" via the first control unit 6 is activated, and the desired hot water temperature (TR) is reached.
Regardless of the above, the mixing valve of the hot / water mixing device 5 is fully opened on the branch pipe side (the supply of hot water from the hot water storage tank 4 is zero). As a result, water from the branch pipe 22 is supplied to the auxiliary heat source device (gas instantaneous water heater).

During this period, an auxiliary heat source device (gas instantaneous water heater)
On the side, the secondary pressure of the heat source gas is adjusted. Adjustment is performed in a state where the combustion part of the auxiliary heat source device is burned, and the minimum secondary pressure of gas,
The opening of the built-in proportional valve for gas flow rate adjustment is adjusted in the order of maximum secondary pressure. More specifically, a measuring device such as a manomemer is attached to the secondary pressure detection port of the gas water heater.
While observing the secondary pressure value, the current value applied to the proportional valve for adjusting the gas flow rate is changed by the adjusting volume or the like provided in the second controller 14 so that the secondary pressure becomes appropriate, and the valve is opened. Adjust the degree. This adjustment is actually performed in the combustion state of the gas, and the combustion is performed at the maximum capacity of the gas water heater (at the time of adjusting the maximum secondary pressure), so it is necessary to supply a sufficient amount of water and a sufficiently low temperature water. Is. Otherwise, a situation may occur in which adjustment work cannot be performed due to abnormal overheating.

After the adjustment of the secondary gas pressure is completed, the trial operation switching section 7 is pressed again to return to normal operation. At this time,
The indicator lamp that was showing the trial run status also goes out. The operator can easily recognize that the trial operation has been completed and the normal operation has been performed.

Here, it is preferable to attach a timer for measuring the duration of the trial run so that the "trial run" automatically returns to the "normal run" when the trial run duration exceeds a predetermined time. It is possible to prevent the operator from forgetting to operate the test operation. The adjustment work of the secondary gas pressure is about 10
Since it is about a minute, it is appropriate that the predetermined time is about 20 minutes.

The trial operation switching unit 7 does not necessarily have to be provided in the first control unit 6, and may be the second control unit 14 or the remote controller 15.

[0020]

The solar water heater of the present invention has the following effects. (1) When adjusting the secondary pressure of the heat source gas of the auxiliary heat source device, manually close the hot water side pipe to the auxiliary heat source device and open the bypass water supply side pipe manually, and then to the auxiliary heat source device. Gas 2 of the auxiliary heat source device (gas instantaneous water heater) can be operated in a short time with simple operation without the need for troublesome work such as water supply.
The secondary pressure can be easily adjusted and normal operation of the water heater can be started. (2) With a timer etc. that measures the duration of the trial run state, it is possible to prevent the operator from forgetting to end the operation (switch operation, etc.) and the solar water heater may be left in the trial run state. There is no.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of a solar water heater with a built-in auxiliary heat source device of the present invention.

FIG. 2 is a flowchart of temperature control of the solar water heater during normal operation according to the present invention.

FIG. 3 is a flow chart of temperature control of a solar water heater during a test run according to the present invention.

[Explanation of symbols]

1: Solar water heater 2: Heat exchanger 3: Forced circulation pump 4: Hot water storage tank 5: Hot water mixing device 6: Control unit (first control unit) 7: Trial operation switching unit (buttons, switches) 8: Mixing Hot water outlet 9: Water inlet 10: Heat collector 11: Auxiliary heat source device (gas type auxiliary heat source device) 12: Combustion unit 13: Heat exchanger 14: Control unit (second control unit) 15: Remote control unit (remote control) ) 16: Water flow detection device 17: Thermometer 18: Remote control code 19: Remote control code 20: Hot water inlet 21: Hot water outlet 22: Branch pipe 23: Thermometer 24: Flowmeter 30: (auxiliary heat source built-in type) solar hot water vessel

Claims (3)

[Claims] 1. A solar water heater having a hot water storage tank, a hot water mixing device for mixing hot water from the hot water storage tank and feed water from a branch pipe and a control unit, and an auxiliary heat source unit having a heat exchanger, a combustion unit and a control unit. In the solar hot water supply device, which is provided with a test operation function, in the test operation mode, the mixing ratio in the hot water mixing device is such that the water supply from the branch pipe is 100% and the amount of hot water from the hot water storage tank is zero. A solar water heater that is automatically adjusted by a hot and cold water mixing device and can adjust the secondary pressure of the heat source gas of the auxiliary heat source device under the conditions. 2. The solar water heater according to claim 1, wherein a solar water heater side hot water storage tank is provided with a thermometer for measuring hot water temperature (Th), and a mixed hot water flow rate (Q) is provided downstream of the hot and cold water mixing device. A flow meter for measurement is arranged, a water flow detector and a thermometer are arranged upstream of the auxiliary heat source side heat exchanger, and a trial operation switching section is provided in the first control section or the second control section, In the trial operation mode, the mixing ratio in the hot and cold water mixing device is automatically adjusted so that the amount of water supplied from the branch pipe is 100% and the amount of hot water from the hot water storage tank is zero, and under the conditions, the heat source gas of the auxiliary heat source device is supplied. The secondary pressure can be adjusted, and in the normal operation mode, Th is the desired hot water temperature (TR).
In the above case, on the condition that the combustion part of the auxiliary heat source device is stopped, on the solar water heater side, the hot water mixing device is adjusted by using TR as the control temperature to control the hot water temperature on the outlet side, and the Th is TR.
In the case of less than, the solar water heater in which the hot water temperature at the outlet side is controlled by adjusting the hot water mixing device only by the temperature rising portion (α) on condition that the combustion unit is operated on the auxiliary heat source side. 3. The solar water heater according to claim 1 or 2,
A solar water heater that adds a timer to measure the duration of trial operation, and automatically returns from "trial operation" to "normal operation" when the duration of trial operation exceeds a predetermined time.