JP3608025B2 - Auxiliary water heater connection unit - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an auxiliary water heater connection unit in a water heater that connects an auxiliary water heater such as a solar water heater so that hot water from the auxiliary water heater can be supplied to a main water heater as needed.
[0002]
[Prior art]
Conventionally, an auxiliary water heater, for example, a solar water heater (solar hot water heater) is connected to supply hot water from the auxiliary water heater to the main water heater as needed. .
In such a conventional water heater, there is a problem that the temperature of the hot water supply from the auxiliary water heater (solar water heater) must be supplied to the main water heater without being controlled.
[0003]
In order to solve this problem, means for adjusting the hot water temperature by mixing cold water with hot water from an auxiliary water heater (solar water heater) has been proposed, and the temperature control is performed as follows. .
The solar hot water temperature Tho from the auxiliary water heater (solar water heater), the preset hot water temperature Ts from the main hot water heater, and the incoming water temperature Tm to the main hot water heater are determined from the preset temperature Ts. When the temperature α is higher than a value higher by α (for example, α = 1 degree) (Tho ≧ Ts + α), the heating and combustion of the main water heater is stopped and supplied to the main water heater at the hot water supply set temperature Ts, that is, the incoming water temperature Tm. And the hot water supply set temperature Ts become equal (Tm = Ts).
When the solar hot water temperature Tho is less than a predetermined temperature α (for example, α = 1 degree) lower than the set temperature Ts (Tho <Ts−α), the hot water supply set temperature Ts is the reference temperature To (for example, 60 ° C.). ) If this is the case, mix hot water from solar water with cold water, lower the incoming water temperature Tm to the main hot water heater to a high incoming water temperature Tmh (eg 45 ° C.), perform heating combustion in the main hot water heater, Hot water is supplied at the hot water supply set temperature Ts.
Conversely, when the hot water supply set temperature Ts is lower than the reference temperature To (eg, 60 ° C.), the incoming water temperature Tm to the main hot water heater is lowered to the low incoming water temperature Tml (eg, 45 ° C.) and heated by the main hot water heater. Combustion is performed, and hot water is supplied at a hot water supply set temperature Ts.
[0004]
[Problems to be solved by the invention]
However, in a hot water supply apparatus connected to a conventional solar water heater, the hot water set temperature Ts is lower than the reference temperature To (for example, 60 ° C.), and the incoming water temperature Tm to the main water heater is changed to the low incoming water temperature Tml (for example, 45 ml). C.) and the main hot water heater is heated and combusted, the minimum number of the main water heater (for example, 1.5 in design) is large due to manufacturing variations and other causes (for example, 4), when the water supply pressure is low and the bath pouring flow rate is large (for example, 7 liters / minute), hot water with a hot water supply temperature of 44 ° C. or less cannot be poured into the bathtub, and the bath temperature cannot be controlled at 44 ° C. or less. Therefore, there was a problem that automatic operation was not possible.
Therefore, there has been a problem that solar hot water cannot be fully utilized.
[0005]
An object of the present invention is to provide an auxiliary water heater that can be automatically operated even when a main water heater having a high minimum number is used in a water heater connected with an auxiliary water heater, and can realize an arbitrary set temperature. To provide a connection unit.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an auxiliary water heater connecting unit of the present invention is a water heater that connects an auxiliary water heater so that hot water from the auxiliary water heater can be supplied to the main water heater as needed. If the hot water temperature T h of the main water heater is a state exceeding the hot water set temperature T s lasted only a predetermined time t, drinking-water tapping set temperature T so the previous blend mixed with hot and cold water from the auxiliary water heater By reducing the hot water set temperature T sob by a predetermined correction temperature b , the supply water temperature T m to the main water heater is lowered according to the set hot water temperature T s from the main water heater, and the hot water temperature T h can be maintained in the hot water set temperature T s.
In claim 2, when the combustion is stopped, a difference between the set hot water supply temperature T s and the mixed water tapping hot water set temperature T so is set as a corrected storage temperature T d , and the correction storage temperature T d is stored with a slightly lower value. the correction storage temperature T d, by providing a limit value of the upper limit value and the lower limit value, always an auxiliary hot water supply is gradually restore the water mixture tapping set temperature T m in the case of excessively lowered water mixture tapping set temperature T m Can be used effectively.
Further, in the correction storage temperature, by providing a limit value of the upper limit value and the lower limit value, there is no possibility of storing up to unwanted temperatures.
In claim 3, fine control can be performed by storing the corrected storage temperature T d until the power is turned off or until the operation is turned off.
According to claim 4, finer control can be performed by providing two or more determination temperatures, determination times, and correction temperatures according to at least one of the set temperature, the hot water supply capacity, or the flow rate of the main water heater.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An example of a schematic configuration of the hot water supply apparatus to which the present invention is applied will be described with reference to FIG. 2. The hot water supply apparatus includes a main hot water heater A, a solar hot water heater B, and a solar hot water supply connection C.
The main water heater A includes a can body 10, a burner 11 and a heat exchange pipe 23 arranged in the can body 10, a water inlet path 21 and a hot water outlet path 22 connected to the heat exchange pipe 23, and a main controller 30. And.
[0008]
The water inlet 21 is provided with a water amount sensor 21a and a water inlet temperature sensor 21b. The hot water outlet 22 is provided with a first hot water temperature sensor 22a, a second hot water temperature sensor 22c and a hot water supply curan located downstream thereof. 22b is provided.
In addition, a bypass passage 24 is provided to connect the inlet water passage 21 and the hot water passage 22 between the first hot water temperature sensor 22a and the second hot water temperature sensor 22c, and the bypass passage 24 is provided with a bypass adjustment valve 24a. ing.
Further, a bath dropping path 25 is branched from the hot water supply path 22, and a drop opening / closing valve 25 a is provided in the bath dropping path 25.
[0009]
The can body 10 is provided with a bath remedy heat exchanger 43, and the bath remedy heat exchanger 43 is connected to a bath forward passage 41 and a bath return passage 42 connected at one end to a bathtub 44. The bath return path 42 is provided with a circulation pump 42a, a bath temperature sensor 42b, and a water flow switch 42c.
The main controller 30 inputs information about the availability of each sensor of the main water heater A and a command from the remote controller 50, and controls the operation of the main water heater A. The main controller 30 and the remote controller 50, And the main controller 30 and the solar hot water supply connection controller 60 of the solar hot water supply connection part C described later are connected by a communication circuit to exchange information.
[0010]
The solar water heater connection C includes the solar water heater connection controller 60 and a solar water heater 61. The solar water heater 61 includes a solar water heater 70 from the solar water heater B and a water source such as a water supply. The water supply channel 80 is connected to the solar water mixer 61 and the water supply channel 21 is connected to the solar water mixer 61.
The solar hot water supply passage 70 is provided with an open / close valve 62 such as an electromagnetic open / close valve and a solar hot water temperature sensor, and the solar water supply temperature sensor 65 is provided in the water intake passage 21.
The solar water heater connection controller 60 adjusts the mixing ratio of the solar water mixer 61 based on the temperature detection signals input from the temperature sensors 63, 64, 65 and the control information input from the main controller 30. The on-off valve 62 is opened and closed.
[0011]
The solar water heater B includes a solar heat exchanger 71 to which a solar hot water passage 70 is connected, and a hot water storage tank 72, and the hot water storage tank 72 is connected to the solar hot water passage 70 and the water supply passage 80.
The medium heated by the solar heat exchanger 71 is introduced into the hot water storage tank 72, and the water in the hot water storage tank 72 is heated by heat exchange to be hot water.
Hot water in the hot water storage tank 72 is supplied through a solar hot water supply passage 70.
[0012]
The control operation will be described with reference to FIG. 1. When the operation switch of the main water heater A and the solar water heater B is turned on by operating the remote controller 50 or the like, the hot water using the solar water heater B is in a state of being discharged. When the hot water supply curan 22 b is opened, the hot water supply from the solar water heater B is started from the solar hot water supply passage 70 via the on-off valve 62 and the solar water heater 61.
[0013]
When the water amount sensor 21a confirms water flow that is equal to or greater than the minimum working water amount (MOQ) (step S1), the solar hot water temperature Tho detected by the solar hot water temperature sensor 63 and a set hot water supply temperature Ts (for example, Ts = 40 ° C.) described later. ) Compared with a value higher by a predetermined temperature a (for example, a = 1 degree) (step S2), and the solar hot water temperature Tho is equal to or higher than the sum of the set hot water supply temperature Ts and the temperature a (Tho ≧ Ts + a). ), The set hot water supply temperature Ts and the mixed water discharge hot water set temperature Tso from the solar water mixer 61 are made equal (Ts = Tso), that is, the incoming water temperature Tm to the main water heater A after mixing cold water is set to It is made equal to the set hot water temperature Ts (Tm = Tso = Ts), the hot water supply A is stopped and the hot water is supplied (step S7), the solar hot water temperature Tho and the set hot water temperature are set. The comparison between the temperature Ts and the temperature a is repeated (step S2).
[0014]
In step S2, when the solar hot water temperature Tho is less than the sum of the set hot water supply temperature Ts and the temperature a (Tho <Ts + a), the main water heater A is shifted to the combustion control mode (step S3), and the set hot water temperature is set. The difference between Ts and the mixed water hot water set temperature Tso from the solar water mixer 61 is calculated and stored as the corrected storage temperature Td (Td = Ts−Tso) (step S4).
[0015]
When it is confirmed by the water amount sensor 21a that water passing the minimum working water amount (MOQ) or more is being performed (step S5), the state where the hot water supply temperature Th from the main water heater A exceeds the set hot water supply temperature Ts It is determined whether or not to continue for a predetermined time t (step S8), and when the state where the hot water supply temperature Th exceeds the set hot water supply temperature Ts continues for a time t, the mixed water discharge setting from the solar water mixer 61 is set. The temperature Tso is lowered by a preset correction temperature b from the previous mixed water hot water set temperature Tsob (step S9).
[0016]
Next, a difference between the set hot water supply temperature Ts and the mixed water discharge hot water set temperature Tso from the current solar water mixer 61 is calculated as the corrected storage temperature Td (Td = Ts−Tso), and is stored as the current corrected storage temperature Td. (Step S10).
Further, if the state where the hot water supply temperature Th thereafter exceeds the set hot water supply temperature Ts continues for the time t, the mixed water discharge hot water set temperature Tso from the solar water mixer 61 is set to the correction temperature b from the previous mixed water discharge hot water set temperature Tsob. (Step S9), the difference between the set hot water supply temperature Ts and the mixed water discharge hot water set temperature Tso from the current solar water mixer 61 is calculated as a new corrected storage temperature Td (Td = Ts−Tso), and is corrected this time. Stored as the storage temperature Td (step S10).
[0017]
During normal combustion, the corrected storage temperature Td (Td = Ts−Tso) is always updated and stored, and when a new combustion control mode is entered, the previously stored correction storage temperature Td is used to store the solar mixing temperature. The mixed water hot water set temperature Tso from the water heater 61 is calculated (Tso = Ts−Td), and the combustion control of the main water heater A is performed based on the calculated mixed water hot water set temperature Tso.
[0018]
When it is confirmed by the water amount sensor 21a that water passing over the minimum operating water amount (MOQ) is not performed (step S5), the latest corrected storage temperature Td is stored, and at the time of transition to the next combustion control mode. Preparation (step S6), and then the solar water mixer 61 is stopped.
It should be noted that by providing an upper limit and a lower limit for the corrected storage temperature Td, there is no possibility of storing a strange value. For example, the lower limit value of the mixed water and hot water set temperature Tso is the incoming water temperature, and the upper limit value is the hot water supply set temperature Ts.
Further, the correction storage temperature Td may be stored until the power is turned off or until the operation is turned off.
[0019]
The hot water temperature control region is divided into a normal temperature setting region (for example, Ts <60 ° C.) and a high temperature setting region (for example, Ts ≧ 60 ° C.) according to the value of the hot water supply setting temperature Ts of the main water heater. In the temperature setting range, the solar water heater is often used even if the hot water temperature is slightly higher than the hot water setting temperature, while in the normal temperature setting region where a bath or shower is used, the hot water temperature is accurately set. Set to keep at
In addition, the determination temperature, the determination time, and the correction temperature may be divided into two or more stages in the normal temperature setting area and the high temperature setting area, or may be provided for each set temperature.
Furthermore, these determination conditions and correction values may be provided in multiple stages depending on the hot water supply capacity and the flow rate.
[0020]
According to the above configuration, when the hot water supply temperature Th exceeds the set hot water supply temperature Ts, the hot water supply operation is performed by lowering the mixed water hot water set temperature Tso by the correction temperature b from the previous mixed water hot water set temperature Tsob, and the hot water supply temperature Th is set again. When the hot water supply temperature Ts is exceeded, the hot water supply operation is performed by reducing the mixed water hot water set temperature Tso again by the correction temperature b from the previous mixed water hot water set temperature Tsob, thereby reliably holding the hot water supply temperature Th at the set hot water temperature Ts. be able to.
In addition, by providing a mixed water discharge hot water set temperature Tso suitable for always maintaining the set hot water supply temperature Ts in accordance with the set hot water supply temperature Ts at all times during normal combustion operation, the automatic bath is changed when the set hot water supply temperature Ts is changed. Solar hot water can always be used for hot water supply.
[0021]
In addition, when the combustion is stopped (MOQ OFF), the corrected storage temperature Td is slightly lower, that is, the mixed water hot water set temperature Tso from the solar water mixer is stored at a slightly higher temperature, so that the mixed water hot water set temperature for new hot water supply is stored. Even if Tso is lowered too much, solar hot water can always be effectively utilized by gradually reviving.
Furthermore, the hot water temperature control area is divided into a normal temperature setting area and a high temperature setting area according to the set hot water temperature Ts, and by providing a correction temperature, the hot water temperature set in the normal temperature setting area where a bath or shower is used. While maintaining Ts reliably, energy saving can be promoted by actively using solar hot water in the high temperature setting range.
[0022]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects.
If the state where the hot water temperature T h of the main water heater is more than the hot water set temperature T s is followed by a predetermined time t, drinking-water tapping set temperature T so the last water mixture mixed with hot and cold water from the auxiliary water heater By lowering the hot water set temperature T sob by a predetermined correction temperature b , the supply water temperature T m to the main water heater is lowered in accordance with the hot water set temperature T s from the main water heater, so the temperature T h can be maintained in the hot water set temperature T s.
In claim 2, when the combustion is stopped, a difference between the set hot water supply temperature T s and the mixed water tapping hot water set temperature T so is set as a corrected storage temperature T d , and the correction storage temperature T d is stored with a slightly lower value. the correction storage temperature T d, by providing a limit value of the upper limit value and the lower limit value, always an auxiliary hot water supply is gradually restore the water mixture tapping set temperature T m in the case of excessively lowered water mixture tapping set temperature T m Can be used effectively.
Further, in the correction storage temperature, by providing a limit value of the upper limit value and the lower limit value, there is no possibility of storing up to unwanted temperatures.
In claim 3, fine control can be performed by storing the corrected storage temperature T d until the power is turned off or until the operation is turned off.
According to claim 4, finer control can be performed by providing two or more determination temperatures, determination times, and correction temperatures according to at least one of the set temperature, the hot water supply capacity, or the flow rate of the main water heater.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a control operation of the present invention.
FIG. 2 is a schematic configuration of a hot water supply apparatus to which the present invention is applied.
[Explanation of symbols]
A Main water heater, B Solar water heater, C Solar hot water connection 10 Can body, 11 Burner, 21 Inlet channel, 22 Outlet channel, 23 Heat exchange pipe 25 Drop-in channel, 30 Main controller, 40 Bath memory heat exchanger 41 Bath outbound path, 42 Bath return path, 44 Bathtub, 50 Remote control 60 Solar hot water connection controller, 61 Solar water mixer 70 Solar hot water path, 71 Solar heat exchanger, 72 Hot water storage tank

Claims (4)

The hot water apparatus which can be supplied to the main water heater if necessary hot water from the auxiliary water heater by connecting the auxiliary water heater, hot water temperature T h of the main water heater is more than the hot water set temperature T s If the state has continued by a predetermined time t, thereby reducing the mixing water tapping set temperature T so that mixed hot and cold water from the auxiliary water heater by a correction temperature b determined in advance last mixing water tapping set temperature T sob the auxiliary water heater connection unit, characterized in that to hold the tapping temperature T h of the main water heater in the hot water set temperature T s. During combustion stop, the difference between the set hot water supply temperature T s and the mixing water tapping set temperature T so and the correction storage temperature T d, as well as to store the correction storage temperature T d to a value slightly lower, the correction storage temperature T d the auxiliary water heater connection unit according to claim 1, wherein providing a limit value of the upper limit value and the lower limit value. Correcting storage temperature T d, the auxiliary water heater connection unit according to claim 1 or 2, wherein the storing until the power off, or until the operation off. The auxiliary hot water supply according to claim 1, 2 or 3 , wherein two or more determination temperatures, determination times and correction temperatures are set according to at least one of a set temperature, a hot water supply capacity or a flow rate of the main water heater. Connection unit.

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