JP2012047374A - Hot water heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water heating apparatus in which a heating means is efficiently controlled without detecting a set temperature of a heating panel.SOLUTION: The hot water heating apparatus 10 includes a hot water circulation circuit 14 which connects the heating means 11, the heating panel 12 and a first temperature sensor 13 together, and circulates hot water and a control means 15 which outputs an operation stopping signal and an operation starting signal to the heating means 11, wherein the heating means 11, when the operation stopping signal is outputted from the control means 15, stops the operation, and detects and stores a temperature T of the hot water via a second temperature sensor 25 and, when the operation starting signal is outputted from the control means 15 and the time until the operation starting signal is outputted after the operation stopping signal is lastly output is a preset time P or is more than the time P, the operation is started by regarding the preset temperature Q as the heating target temperature of the hot water and, when the time until the operation starting signal is outputted after the operation stopping signal is lastly outputted is less than the preset time P, the operation is started by regarding the temperature provided by adding a preset temperature α to the temperature T as the heating target temperature of the hot water.

Description

The present invention relates to a hot water heater that supplies hot water heated by a heating means to a heating panel via a circulation circuit to heat a floor and a room.

2. Description of the Related Art Conventionally, in order to heat a floor or a room, there is a hot water heater that supplies hot water heated by heating means such as a heat pump unit to a heating panel (an example of a radiator) installed under the floor or indoors via a circulation circuit. It is used. In the hot water heater, the temperature of the hot water supplied to the heating panel is not significantly higher than the predetermined upper limit temperature or lower than the predetermined lower limit temperature, or for efficient heating of the hot water. Control of the heating means is required, and specific examples thereof are described in Patent Documents 1, 2, and 3, for example.

In Patent Document 1, when the operation of the heating unit is started, the compressor of the heating unit is operated at a low frequency to moderate the temperature rise of the hot water and avoid the temperature of the hot water greatly exceeding a predetermined upper limit temperature. For the control.
In Patent Document 2, when the operation stop signal of the heating means is output, the heating means is not stopped immediately, but the heating means is stopped after continuing the operation of the heating means to increase the temperature of the hot water by a predetermined temperature, Control is performed to prevent a rapid temperature drop of the heating panel.
In Patent Document 3, a target temperature of hot water to be sent to a heating panel (hot water heating terminal) is calculated in consideration of a heat loss of a building, a floor area, etc., and heat is controlled by controlling the heating means based on the target temperature. The loss is reduced.

JP 2000-46417 A JP 2006-46700 A JP 2009-275941 A

By the way, in the market, there is a hot water heater with a specification that cannot detect the value set by the control means on the heating panel side with respect to the temperature of the hot water circulating in the hot water circulation circuit, and a hot water heater with a specification that can be detected. is doing.
In a hot water heating apparatus having a specification in which the heating means cannot detect the set value of the control means on the heating panel side, the heating means controls the heating means with the operation start signal and the operation stop signal output from the control means as inputs. Therefore, the control method is different from the case where the operation control is performed by inputting the set value of the control means on the heating panel side.
On the other hand, Patent Documents 1 to 3 are not limited to specifications in which the heating means cannot detect the set value of the control means on the heating panel side. Therefore, the efficient control of the heating means with respect to the hot water heating apparatus of the specification in which the heating means cannot detect the set value of the control means on the heating panel side has been a problem.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hot water heater that efficiently controls heating means without detecting a set temperature of hot water supplied to a heating panel.

The hot water heating apparatus according to the present invention that meets the above-mentioned object is connected to the heating means, the heating panel, and the first temperature sensor, the hot water circulating circuit through which the hot water circulates, and the heating that is measured via the first temperature sensor. When it is detected that the temperature X of the hot water that has passed through the panel exceeds a preset upper limit temperature, an operation stop signal is output to the heating means, and the temperature X falls below a preset lower limit temperature. In the hot water heater having a control means for outputting an operation start signal to the heating means, the heating means includes a second temperature for measuring the temperature of the hot water before being heated by the heating means. When the operation stop signal is output from the control means, the heating means stops the operation and detects and stores the temperature T of the hot water via the second temperature sensor. , Shika The heating means sets in advance a time from when the operation stop signal is output from the control means to when the operation start signal is output when the operation start signal is output from the control means. In the case of the set time P or exceeding the time P, the operation is started with the preset temperature Q not depending on the temperature T as the heating target temperature of the hot water, and finally the operation is performed from the control means. When the time from when the stop signal is output to when the operation start signal is output is less than the time P, the temperature Q is set in advance to the temperature T without setting the temperature Q as the heating target temperature. The operation is started with the temperature obtained by adding the temperature α as the heating target temperature of the hot water.

In the hot water heating apparatus according to the present invention, the heating means exceeds a preset time P2 from when the operation start signal is last output from the control means to when the operation stop signal is output. When the time P2 has elapsed since the last operation start signal was output, the preset temperature β is added to the heating target temperature of the hot water to obtain a new heating target temperature, and the control means Until the operation stop signal is output, it is preferable that the temperature β is added to the latest heating target temperature every time a preset time P3 elapses to obtain a new heating target temperature.

In the hot water heating apparatus according to the present invention, it is preferable that the operation start signal and the operation stop signal output from the control unit to the heating unit are contact signals.

In the hot water heater according to the present invention, the heating means is preferably a heat pump unit capable of adjusting an operating frequency of the compressor.

In the hot water heating apparatus according to the present invention, when the heating means outputs an operation start signal from the control means, the time from when the operation stop signal is last output from the control means until the operation start signal is output. When the preset time P is not less than the preset time P, the operation is started with the preset temperature Q that does not depend on the temperature T as the heating target temperature of the hot water, and the operation start signal is output after the operation stop signal is finally output from the control means. When the time until is output is less than the preset time P, the temperature Q is not set as the heating target temperature of the hot water, and the temperature obtained by adding the preset temperature α to the temperature T is heated. Since the operation is started as the target temperature, the heating means determines the heating target temperature of the hot water without detecting the temperature preset on the heating panel side, compared with the case where the heating target temperature is always a fixed value. Hot water temperature is above Can avoid exceeding the temperature increases, it is possible to perform efficient hot water heating control.
Further, when determining the heating target temperature, it is determined whether or not to consider the temperature of the hot water when the operation stop signal is last output depending on whether or not the operation of the heating means has been stopped for a predetermined time or more. Compared with the case where the heating target temperature is determined in consideration of the temperature of the hot water when the operation stop signal is output at the last time, it is possible to finely adjust the temperature of the hot water.

In the hot water heating apparatus according to the present invention, when the time from when the operation start signal is last output from the control means to when the operation stop signal is output exceeds the preset time P2, When the time P2 elapses after the operation start signal is output, the preset temperature β is added to the heating target temperature of the hot water to obtain a new heating target temperature until the operation stop signal is output from the control means. When the temperature β is added to the latest heating target temperature every time the preset time P3 elapses to obtain a new heating target temperature, the heating means keeps the temperature of the hot water even if the operation is continued for a predetermined time or more. When the temperature does not exceed the upper limit temperature, the heating target temperature can be raised stepwise so that an appropriate amount of heat can be radiated from the heating panel at an early stage.

In the hot water heating apparatus according to the present invention, when the operation start signal and the operation stop signal output from the control means to the heating means are contact signals, the heating means connected to the control means is a circuit that receives a signal from the control means. The complexity can be avoided.
Further, in the hot water heating apparatus according to the present invention, when the heating means is a heat pump unit capable of adjusting the operating frequency of the compressor, the temperature rising rate of the hot water can be reliably adjusted by adjusting the operating frequency of the compressor. In addition, the operation efficiency can be improved.

It is a block diagram of the hot water heating apparatus which concerns on one embodiment of this invention. (A), (B) is explanatory drawing which shows the change of the power consumption of the temperature of warm water and the heat pump unit about the conventional warm water heating apparatus and the warm water heating apparatus which concerns on one embodiment of this invention, respectively. It is a flowchart which shows operation | movement of the heat pump of the hot water heating apparatus which concerns on one embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, a hot water heating apparatus 10 according to an embodiment of the present invention connects a heat pump unit (an example of heating means) 11, a heating panel 12, and a first temperature sensor 13, and the hot water circulates. When it is detected that the temperature X of the hot water that has passed through the hot water circulation circuit 14 and the heating panel 12 measured via the first temperature sensor 13 exceeds a preset upper limit temperature, the operation is stopped in the heat pump unit 11. And a control means 15 that outputs a signal and outputs an operation start signal to the heat pump unit 11 when it is detected that the temperature X has fallen below a preset lower limit temperature. This will be described in detail below.

As shown in FIG. 1, the heat pump unit 11 includes a heat medium circulation circuit 16 through which a heat medium (for example, Freon 410A) circulates. The heat medium circulation circuit 16 includes a heat medium that circulates through the heat medium circuit 16. A heat exchanger 17 that heats the hot water circulating in the hot water circulation circuit 14 as a heat source is provided.
In addition to the heat exchanger 17, the heat medium circulation circuit 16 is provided with a capillary tube 18 that is an example of a decompression unit, a heat exchanger 19 that recovers the heat of the outside air, and a compressor 20.

The heat medium circulating in the heat medium circuit 16 is condensed by applying heat to the hot water circulating in the hot water circuit 14 in the heat exchanger 17, expanding through the capillary tube 18, and then the heat exchanger 19. The heat of the outside air is absorbed by heat exchange while passing through the heat exchanger 19. The heat medium that has passed through the heat exchanger 19 is sent to the compressor 20, and after being brought to a high pressure state by the compressor 20, is supplied to the heat exchanger 17.
The compressor 20 incorporates an inverter, and the operating frequency (hereinafter also referred to as a unit “frequency”) can be adjusted by changing the magnitude of the output value of the inverter. By enlarging, a higher temperature heating medium is supplied to the heat exchanger 17.

The heat pump unit 11 is signal-connected to an HP control means 22 that controls the output value of the inverter built in the compressor 20, and thus the frequency of the compressor 20. In addition, the HP control means 22 is signal-connected to a fan 23 that is disposed close to the heat exchanger 19 and promotes heat exchange in the heat exchanger 19.
The HP control means 22 is composed of, for example, a microcomputer and is loaded with a program for transmitting a predetermined signal as appropriate to the compressor 20, the fan 23, and the like.

The heat pump unit 11 includes a circulation pump 24 that circulates hot water through the hot water circulation circuit 14, and a second temperature sensor 25 that measures the temperature of the hot water circulated through the hot water circulation circuit 14 before being heated by the heat exchanger 17. Is provided.
The circulation pump 24 starts or stops operation in accordance with a signal output from the control means 15. The second temperature sensor 25 is disposed on the upstream side of the heat exchanger 17 with reference to the flow of hot water circulating in the hot water circulation circuit 14, and the control means 15 exchanges heat via the second temperature sensor 25. The temperature of the warm water before heating can be measured by the heat exchanger 17 before flowing into the vessel 17.

The warm water circulation circuit 14 is provided with connection valves 26 and 27 on the upstream side and the downstream side of the heat exchanger 17 along the flow of warm water, respectively. The U-shaped circuit arranged in the heat pump unit 11 and the U-shaped circuit arranged outside the heat pump unit 11 are connected via the connection valves 26 and 27, and the annular hot water circulation circuit 14 is connected. Forming.
In the hot water circulation circuit 14, a heating panel 12 and a first temperature sensor 13 are disposed at a position away from the heat pump unit 11.
The heating panel 12 is installed under the floor or indoors, dissipates the heat of the hot water circulating through the hot water circulation circuit 14, and warms the room.
The 1st temperature sensor 13 is arrange | positioned in the downstream of the heating panel 12, and measures the temperature of the warm water after passing through the heating panel 12 and temperature falling. The first temperature sensor 13 is connected to the control means 15 by signal, and the control means 15 measures the temperature of the hot water after being radiated through the heating panel 12 via the first temperature sensor 13. .

The control means 15 is signal-connected to an operation panel 28 by which a user of the hot water heater 10 sets the heating temperature of the heating panel 12 and the like. Based on the value of the heating temperature set on the operation panel 28, the control means 15 sets the upper limit temperature Th (this embodiment) that causes the heat pump unit 11 to stop the operation with respect to the temperature of the hot water measured by the first temperature sensor 13. Then, the lower limit temperature Tu (25 to 35 ° C. in the present embodiment) for starting the operation of the heat pump unit 11 is determined. It should be noted that a relationship of Th> Tu is established between Th and Tu.

When the temperature X of the hot water measured by the first temperature sensor 13 exceeds the temperature Th (X> Th), the control means 15 causes the HP control means 22 to stop the operation of the heat pump unit 11. Is output. When the operation stop signal of the heat pump unit 11 is output from the control means 15, the HP control means 22 stops the compressor 20 and the fan 23 and stops the operation of the heat pump unit 11.

When the operation of the heat pump unit 11 is stopped, the temperature of the hot water circulating in the hot water circulation circuit 14 decreases, and the temperature X of the hot water measured by the first temperature sensor 13 falls below the temperature Tu ( X <Tu), the control means 15 outputs an operation start signal for starting the operation of the heat pump unit 11 to the HP control means 22. When the operation start signal of the heat pump unit 11 is output from the control unit 15, the HP control unit 22 starts the operation of the compressor 20 and the fan 23 and restarts the operation of the heat pump unit 11. With the operation control of the heat pump unit 11, the temperature of the hot water circulated through the hot water circulation circuit 14 and supplied to the heating panel 12 is adjusted so as not to greatly exceed the upper limit temperature Th or less than the lower limit temperature Tu.

Here, the control means 15 and the HP control means 22 are electrically connected, and the operation start signal and the operation stop signal of the heat pump unit 11 output from the control means 15 to the HP control means 22 are contact signals. In this embodiment, when the contact circuit on the control means 15 side changes from the open state to the closed state, it means that the operation start signal is output from the control means 15 and the contact circuit on the control means 15 side is closed. This means that an operation stop signal has been output from the control means 15 when the open state is reached. The control means 15 is composed of, for example, a microcomputer and has a program for performing switching control of the contact circuit in accordance with the temperature measured via the first temperature sensor 13.

In the conventional hot water heater, when the heat pump unit is in operation, the HP control means operates the compressor at a predetermined maximum frequency. Therefore, the electric power consumed by the heat pump unit when the heat pump unit is operating is a constant value as shown in FIG.
On the other hand, in the hot water heating apparatus 10, the frequency of the compressor 20 is determined based on the temperature of the hot water measured by the second temperature sensor 25 when the operation of the heat pump unit 11 is finally stopped. If the temperature of the hot water measured at 25 is high, the frequency of the compressor 20 increases. If the temperature of the hot water measured by the second temperature sensor 25 is low, the frequency of the compressor 20 decreases. Therefore, the power consumption of the heat pump unit 11 when the heat pump unit 11 is operating becomes different values as shown in FIG.

Next, the operation of the heat pump unit 11 will be described in detail.
The HP control means 22 stores the temperature T of hot water measured by the HP control means 22 via the second temperature sensor 25 when the operation stop signal is finally output from the control means 15. Suppose that
When an operation for starting heating by the heating panel 12 is performed on the operation panel 28, the control unit 15 starts the operation of the circulation pump 24 and, as shown in FIG. 11 operation start signals (hereinafter simply referred to as “operation start signals”) are output (step S1).

When the operation start signal is output from the control unit 15, the HP control unit 22 operates after the operation stop signal of the heat pump unit 11 (hereinafter simply referred to as “operation stop signal”) is output from the control unit 15. The time until the start signal is output is a preset time P (in this embodiment, 20 to 40 minutes, for example, 30 minutes) or more (that is, time P or exceeds time P) or less than time P Is determined (step S2).

When the time from when the operation stop signal is last output from the control means 15 in step S2 to when the operation start signal is output is equal to or longer than the time P, the HP control means 22 depends on the stored temperature T. A preset temperature Q (in this embodiment, 45 to 55 ° C., for example, 50 ° C.) is defined as the heating target temperature of hot water (step S3). Then, the HP control unit 22 operates the fan 23 and starts the operation of the compressor 20 at a frequency corresponding to the defined heating target temperature Q, that is, starts the operation of the heat pump unit 11 (step S4). In the present embodiment, Q is higher than T + α.

On the other hand, when the time from when the operation stop signal is last output from the control means 15 at step S2 until the operation start signal is output is less than the time P, the HP control means 22 sets the stored temperature T to A temperature T + α obtained by adding a preset temperature α (3 to 10 ° C., for example, 5 ° C. in the present embodiment) is defined as a heating target temperature of hot water heated by the heat exchanger 17 (step S3 ′). Then, the HP control means 22 operates the fan 23 and starts the operation of the compressor 20 at a frequency corresponding to the defined heating target temperature T + α (step S4).

Here, in step S3 ′, the heating target temperature is defined based on the temperature of the hot water when the operation stop signal is finally output from the control means 15, that is, when the operation of the heat pump unit 11 is stopped. In step S3, the heating target temperature is defined without considering the temperature of the past hot water. This is because the temperature drop amount of the hot water circulating in the hot water circulation circuit 14 differs depending on the length of the stop time of the heat pump unit 11, and the same heating target temperature is used when the temperature drop of the hot water is large and small. This is because when the compressor 20 is operated, it takes a long time for the hot water to rise to an appropriate temperature when the temperature drop of the hot water is large.

After the operation of the heat pump unit 11 is started, the HP control unit 22 determines that the time from when the operation start signal is last output from the control unit 15 until the operation stop signal is output is a preset time P2 ( In this embodiment, it is determined whether it is 5 to 15 minutes or less, for example 10 minutes) or less than the time P2 (step S5).
When the operation stop signal is output, the HP control unit 22 compresses when the time from the last output of the operation start signal from the control unit 15 to the output of the operation stop signal is equal to or less than the time P2. The operation of the machine 20 and the fan 23 is stopped, that is, the operation of the heat pump unit 11 is stopped, and the temperature Tx of the hot water is detected via the second temperature sensor 25, and this temperature Tx is stored as a new temperature T ( Step S6).

On the other hand, when the operation stop signal is output, when the time from the output of the operation start signal last output from the control means 15 to the output of the operation stop signal exceeds the time P2, the control means 15 outputs the last When the time P2 elapses after the operation start signal is output, the HP control means 22 sets the temperature β preset to the heating target temperature of the hot water (1 to 4 ° C. in this embodiment, for example, 2 ° C.). Are added to obtain a new heating target temperature, the operation frequency of the compressor 20 is set to a frequency corresponding to the new heating target temperature, and the operation of the compressor 20 is continued (step S7). In the present embodiment, α> β.
After changing the operating frequency of the compressor 20 in step S7, the HP control means 22 changes the operating frequency of the compressor 20 until the control means 15 outputs the operation stop signal. It is determined whether it is less than P3 (3 to 8 minutes in the present embodiment, for example, 5 minutes) or less than time P3 (step S8). In this embodiment, P2> P3.

When the time P3 has passed without changing the operation frequency of the compressor 20 without outputting the operation stop signal from the control means 15, the process returns to step S7 and the temperature β is set to the latest hot water heating target temperature. Are added to obtain a new hot water addition target temperature, and the operating frequency of the compressor 20 is changed to a frequency corresponding to the new hot water addition target temperature.
Thereafter, steps S7 and S8 are repeated until the operation stop signal is output from the control means 15, and each time P3 elapses, the temperature β is added to the latest hot water heating target temperature to add a new hot water addition target. The temperature is defined, and the operating frequency of the compressor 20 is changed according to the new target temperature for adding hot water.

This assumes that the operation panel 28 is operated to increase the set temperature of heating. That is, even though the operation of the heat pump unit 11 is longer than the time P2 or after the time P3, the temperature of the hot water measured by the first temperature sensor 13 causes the operation of the heat pump unit 11 to be performed. This is because the frequency of the compressor 20 is increased to increase the temperature rise rate of the hot water when it has not risen to the temperature at which it stops.

When an operation stop signal is output from the control unit 15 in step S8, the HP control unit 22 stops the operation of the compressor 20 and the fan 23, and the temperature Tx ′ of the hot water via the second temperature sensor 25. And this temperature Tx ′ is stored as a new temperature T (step S6).
When the heat pump unit 11 performs the above control, as shown in FIG. 2 (B), the total power consumption of the heat pump is suppressed and the hot water overshoot width is reduced as compared with the conventional control. can do. 2A and 2B, the overshoot widths are indicated by D1 and D2, respectively.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, a plurality of heating panels can be provided in the hot water heater. Further, the heating means is not limited to the heat pump unit, and may be a unit using a combustible fuel such as petroleum.

10: Hot water heater, 11: Heat pump unit, 12: Heating panel, 13: First temperature sensor, 14: Hot water circulation circuit, 15: Control means, 16: Heat medium circulation circuit, 17: Heat exchanger, 18: Capillary tube, 19: heat exchanger, 20: compressor, 22: HP control means, 23: fan, 24: circulation pump, 25: second temperature sensor, 26, 27: connection valve, 28: operation panel

Claims (4)

A heating means, a heating panel, and a first temperature sensor are connected to each other, and a hot water circulation circuit through which hot water circulates and a temperature X of the hot water that has passed through the heating panel measured via the first temperature sensor are set in advance. When it is detected that the upper limit temperature is exceeded, an operation stop signal is output to the heating means. When it is detected that the temperature X is lower than a preset lower limit temperature, an operation start signal is output to the heating means. A hot water heating apparatus having a control means for outputting
The heating means is provided with a second temperature sensor for measuring the temperature of the hot water before being heated by the heating means,
The heating unit stops operation when the operation stop signal is output from the control unit, and detects and stores the temperature T of the hot water via the second temperature sensor,
In addition, when the operation start signal is output from the control unit, the heating unit has a time period from when the operation stop signal is last output from the control unit to when the operation start signal is output. When the preset time P or the time P is exceeded, the operation is started with the preset temperature Q not depending on the temperature T as the heating target temperature of the hot water, and finally the operation is stopped from the control means. When the time from when the signal is output to when the operation start signal is output is less than the time P, the temperature Q is set to the temperature T in advance without setting the temperature Q as the heating target temperature of the hot water. The hot water heater is started with the temperature obtained by adding α as the heating target temperature of the hot water. 2. The hot water heating apparatus according to claim 1, wherein the heating means exceeds a preset time P <b> 2 from when the operation start signal is last output from the control means to when the operation stop signal is output. When the time P2 has elapsed since the last operation start signal was output, a preset temperature β is added to the heating target temperature of the hot water to obtain a new heating target temperature, and the control means Until the output of the operation stop signal, the temperature β is added to the latest heating target temperature every time a preset time P3 elapses to obtain a new heating target temperature. . The hot water heating apparatus according to claim 1 or 2, wherein the operation start signal and the operation stop signal output from the control means to the heating means are contact signals. The hot water heating apparatus according to any one of claims 1 to 3, wherein the heating means is a heat pump unit capable of adjusting an operating frequency of the compressor.

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