JP2005233446A - Hot-water supply and heating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simultaneously operate hot-water supply and heating devices in a heat exchanger having a hot-water circuit and a heating circuit formed of one boiler and two water passages. <P>SOLUTION: This hot-water supply and heating apparatus comprises a common heat exchanger 4 through which the hot water circuit 1 and the heating circuit 10 are passed, a hot-water supply heat exchanger sensor 5, a heating heat exchanger sensor 12, a hot-water bypass circuit 6, and a hot-water bypass valve 8. Since the control temperature of the hot-water supply heat exchanger sensor 5 is switched by the detected temperature of the heating heat exchanger sensor 12, a hot-water bypass flow rate is changed, and a heat exchanger flow rate in the hot-water supply circuit 1 is changed accordingly to change a heat absorbing balance between the hot-water supply side and the heating side of the passage in the heat exchanger so as to control the temperature of the hot water at the outlets of hot-water supply and heating devices. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot water supply and heating apparatus in which a hot water supply circuit and a heating circuit are configured by one heat exchanger.

  Conventionally, in this type of hot water supply and heating apparatus, the hot water supply side and the heating side are generally configured by separate heat exchangers, and each hot water temperature control is performed without being affected by each other's operation. Moreover, in the 1 can 2 water configuration, there is a type in which combustion is performed with priority on hot water supply, and the heating side is switched to a bypass that does not go through a heat exchanger depending on the temperature of the heating circuit (for example, see Patent Document 1).

FIG. 4 shows a conventional hot water supply / air heating apparatus described in Patent Document 1. As shown in FIG. As shown in FIG. 4, the first heat exchanger 23 of the hot water supply circuit 1, the second heat exchanger 24 of the heating circuit 10, the can body provided with the first heat exchanger 23 and the second heat exchanger 24. 25, a temperature sensor 27 that detects the temperature of the heating circuit 10, and a three-way valve 26 that switches the heating circuit 10 to the bypass circuit 28.
JP 2002-31406 A

  However, the conventional configuration has a problem that a heat exchanger and a combustion unit are required for hot water supply and for heating, respectively, which increases costs and increases the weight of the main body. In addition, for the one can two water channel configuration in which the hot water supply circuit and the heating circuit are configured by one heat exchanger, when using the hot water supply and the heating at the same time, the hot water temperature control of the hot water supply is given priority, Since the heating side switches the circuit with respect to the temperature that has passed through the heat exchanger, the temperature of the circulating water supplied to the terminal fluctuates between the upper and lower limits and is not stable. Also, there was a problem that the temperature could not be controlled to a constant temperature according to the heating situation.

  The present invention solves the above-mentioned conventional problems, and provides a hot water heater with a single can two water channel heat exchanger configuration that can control the appliance outlet temperature of two passages when hot water and heating are used simultaneously. The purpose is to do.

  In order to solve the above-described conventional problems, the hot water supply and heating apparatus of the present invention is a flow rate variable means for changing the heat exchanger flow rate of the hot water supply circuit according to the heat exchanger outlet temperature of the heating circuit during simultaneous use of hot water supply and heating. The flow rate variable means is controlled to reduce the heat exchanger flow rate of the hot water supply circuit when the heat exchanger outlet temperature of the heating circuit is low, thereby changing the heat absorption balance of the hot water supply circuit and the heating circuit in the heat exchanger. I have to do it.

  As a result, the heat absorption balance of the hot water supply side and the heating side in the circuit in the heat exchanger can be changed, and each heat absorption amount in the heat exchanger is different from the required hot water temperature of the hot water supply and heating. To be optimal, the heat exchanger flow rate can be varied to control the appliance outlet hot water temperature.

  The hot water heater / heater of the present invention can control the hot water temperature of the appliance outlet and the temperature of the heated hot water at the time of simultaneous use in a single can / two water heat exchanger configuration, and can perform the same performance as two cans / two water. Realizing with a heat exchanger configuration, it is possible to reduce the cost and weight, reduce the number of parts, and save resources.

  A first aspect of the present invention is a heat exchanger in which a hot water supply circuit and a heating circuit are configured in one can body, a combustion section that heats the heat exchanger, and a combustion that controls combustion in response to requests for hot water supply and heating operation A hot water supply and heating device comprising a control means, wherein the hot water supply circuit includes an incoming water temperature sensor that detects a water supply temperature, a hot water supply heat exchange sensor that detects a heat exchanger outlet temperature of the hot water supply circuit, and a hot water supply that detects a hot water temperature. A temperature sensor, a flow rate sensor for detecting the flow rate of the hot water supply circuit, a hot water supply bypass circuit for bypassing the heat exchanger inlet and outlet sides of the hot water supply circuit, a water amount control valve for controlling the amount of water in the hot water supply circuit, and the hot water supply bypass circuit The heating circuit is composed of a heating pump that circulates heating water and a heating heat exchange sensor that detects a heat exchanger outlet temperature of the heating circuit, and the combustion circuit The control means comprises flow rate variable means for varying the heat exchanger flow rate of the hot water supply circuit according to the heat exchanger outlet temperature of the heating circuit during simultaneous use of hot water supply and heating, and the flow rate variable means is heat exchange of the heating circuit When the heater outlet temperature is low, control is made to reduce the heat exchanger flow rate of the hot water supply circuit, and the heat absorption balance of the hot water supply circuit and the heating circuit in the heat exchanger is changed, The heat absorption balance of the hot water supply side and heating side in the circuit in the heat exchanger can be changed, and each heat absorption amount in the heat exchanger is optimized for the required hot water temperature of hot water supply and heating. As described above, it is possible to control the appliance outlet hot water temperature by changing the heat exchanger flow rate.

  In particular, the second aspect of the present invention provides a hot water supply bypass by changing the flow rate of the heat exchanger of the hot water supply circuit according to the first aspect of the invention by switching the control temperature of the hot water heat exchange sensor corresponding to the detected temperature of the heating heat exchange sensor. The ratio changes, thereby changing the heat exchanger flow rate of the hot water supply circuit, changing the heat absorption balance of the hot water supply side and heating side in the passage in the heat exchanger, and controlling the hot water temperature of each appliance outlet for hot water supply and heating be able to.

  In the third invention, in particular, the heating pump of the first invention is a DC pump, so that the pump control rotation speed is changed corresponding to the detected temperature of the heating heat exchange sensor, and the heat exchanger flow rate of the heating circuit is changed. The heat absorption balance of the hot water supply side and the heating side in the passage in the heat exchanger can be changed, and the hot water temperature at the outlet of each appliance for hot water supply and heating can be controlled.

  In the fourth aspect of the present invention, an in-machine circulation flow rate control valve for controlling the in-machine circulation amount is provided in the in-machine circulation circuit of the heating circuit of the first invention, and the in-machine circulation flow rate corresponds to the detected temperature of the heating heat exchange sensor. , The heat exchanger flow rate of the heating circuit changes, the heat absorption balance of the hot water supply side and the heating side in the passage in the heat exchanger is changed, and the hot water temperature at the outlet of each of the hot water supply and heating is controlled. be able to.

  In particular, the fifth invention relates to a heating bypass circuit that bypasses the heat exchanger to the heating circuit of the first invention, a heating bypass valve that controls a bypass flow rate of the heating bypass circuit, and a circulating water temperature after the heating bypass merge. By providing a heating outlet sensor to detect and changing the heating bypass ratio corresponding to the detected temperature of the heating outlet sensor, the heat exchanger flow rate of the heating circuit changes, and the hot water supply side and the heating side of the passage in the heat exchanger By changing the heat absorption balance, it is possible to control the hot water temperature at the outlet of each appliance for hot water supply and heating.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a hot water supply / room heating apparatus according to a first embodiment of the present invention.

  In FIG. 1, a hot water supply circuit 1 exchanges heat with a water amount sensor 2 that detects the amount of water flowing through the circuit, an incoming water temperature sensor 3 that detects the temperature of the supplied water, and a hot water supply heat exchange sensor 5 that detects the temperature heated by the heat exchanger 4. A hot water supply bypass circuit 6 that bypasses the water heater 4 and a hot water temperature sensor 7 that detects a hot water temperature after the hot water heated by the heat exchanger 4 and the water in the hot water supply bypass circuit 6 are mixed are configured. The hot water supply bypass circuit 6 is provided with a hot water supply bypass valve 8 for controlling the bypass flow rate.

  The heating circuit 10 includes a heating pump 11 for circulating hot water in the circuit, and a heating heat exchange sensor 12 that detects the temperature of the hot water heated by the heat exchanger 4 and supplied to the terminal. The heat exchanger 4 has a single-can / two-channel heat exchanger configuration common to both the hot water supply circuit 1 and the heating circuit 10, and is configured to be heated by a common combustion unit 13.

  Based on the detection value of each sensor and the signal from the remote controller 14, the control unit 15 controls the combustion amount of the combustion unit 13, the rotational speed of the fan 18, and the valves.

  The operation and action of the hot water heater configured as described above will be described below.

  When both hot water supply and heating are used at the same time, the required amount of combustion is first calculated from the water supply temperature detected by the incoming water temperature sensor 3 of the hot water supply circuit, the detected flow rate of the water amount sensor 2 and the set temperature of the remote controller 14, and this combustion is performed. Combustion is started based on the quantity. Then, combustion control is performed so that the heat exchanger outlet temperature of the hot water supply circuit 1 detected by the hot water supply heat exchange sensor 5 becomes the initial hot water supply heat exchange sensor control temperature, and then the detected temperature of the hot water temperature sensor 7 is controlled by the remote controller 14. The hot water supply hot water temperature is controlled by controlling the flow rate of the hot water supply bypass circuit 6 with the hot water supply bypass valve 8 so as to reach the set temperature.

  In the hot water supply temperature control, if the detection temperature of the hot water supply heat exchange sensor 5 reaches the initial hot water supply heat exchange sensor control temperature, whether the detection temperature of the heating heat exchange sensor 12 is the set heating heat exchange control temperature or not If the detected temperature of the heating heat exchange sensor 12 is lower than the heating heat exchange control temperature, the hot water supply heat exchange sensor control temperature is increased by one step.

  By increasing the control temperature of the hot water supply heat exchange sensor by one step, the combustion amount increases and the temperature at the outlet of the heat exchanger of the hot water supply circuit 1 increases. Therefore, the hot water supply bypass valve 8 has a temperature detected by the hot water temperature sensor 7 of the remote controller 14. The bypass flow rate is controlled to increase so as to reach the set temperature. With this control, the flow rate of the heat exchanger in the hot water supply circuit decreases, and as the heat exchanger, the flow rate on the hot water supply side decreases and the temperature increases, so that heat is more easily absorbed on the heating side.

  Thus, when hot water supply and heating are used simultaneously, the control unit 15 responds to the detection temperature of the heating heat exchange sensor 12 after the detected temperature of the hot water supply heat exchange sensor 5 reaches the initial hot water supply heat exchange sensor control temperature. By changing the control temperature relative to the initial hot water supply heat exchange sensor control temperature, the heat exchanger flow rate of the hot water supply circuit is changed to adjust the heat absorption balance between the hot water supply side and the heating side. The series of controls performed by the control unit 15 during simultaneous heating operation is defined as flow rate variable means.

  And since the temperature of the appliance outlet temperature on the hot water supply side can be controlled by controlling the flow rate of the hot water supply bypass circuit 6, the hot water heat exchange sensor control temperature can be varied so that the heating heat exchange sensor temperature becomes the control temperature.

  Further, by using a DC pump for the heating pump 11, the heating pump 11 can be controlled in rotation speed, and the circulation flow rate of the heating circuit 10 can be varied. Thereby, after changing the heat exchanger flow rate of the hot water supply circuit by the flow rate variable means and adjusting the heat absorption balance between the hot water supply side and the heating side, the flow rate of the heating circuit 10 is adjusted by the rotational speed control of the heating pump 11. Thus, the heat absorption balance between the hot water supply side and the heating side can be adjusted to a good state.

  In the above embodiment, the rotation speed control of the heating pump 11 is performed after the heat exchanger flow rate of the hot water supply circuit is changed by the flow rate varying means, but depending on the detected temperature of the heating heat exchange sensor 12, the flow rate varying means. Thus, it is possible to adjust the heat absorption balance between the hot water supply side and the heating side only by controlling the rotational speed of the heating pump 11 in a state where the flow rate of the heat exchanger in the hot water supply circuit is not changed.

(Embodiment 2)
FIG. 2 is a configuration diagram of a hot water supply and heating apparatus according to the second embodiment of the present invention.

  In FIG. 2, an in-machine circulation circuit 17 is provided in the heating circuit 10 so as to bypass the terminal side, and an in-machine circulation flow rate control valve 19 for varying the in-machine circulation flow rate flowing through the in-machine circulation circuit 17 is provided. Other configurations are the same as those in the first embodiment.

  The operation and action of the hot water heater configured as described above will be described below. The hot water temperature control of the hot water supply circuit is the same as in the first embodiment. When the detection temperature of the hot water supply heat exchange sensor 5 reaches the initial hot water supply heat exchange sensor control temperature, the detection temperature of the heating heat exchange sensor is compared with the heating heat exchange control temperature. The in-machine circulation flow rate control valve 19 is controlled to vary the in-machine circulation flow rate according to the detected temperature of the heating heat exchange sensor with respect to the heating heat exchange control temperature. Thereby, the heat exchanger flow rate of the heating circuit is changed, the heat absorption balance on the hot water supply side and the heating side in the heat exchanger is adjusted, and the appliance outlet hot water temperature for hot water supply and heating can be controlled.

(Embodiment 3)
FIG. 3 is a configuration diagram of a hot water supply and heating apparatus according to a third embodiment of the present invention.

  In FIG. 3, a heating bypass circuit 20 provided with a heating bypass valve 21 that bypasses the heat exchanger 4 to the heating circuit 10 and controls the bypass flow rate, hot water heated by the heat exchanger 4, and the heating bypass circuit 20 It is the structure which provided the heating exit sensor 22 which mixes circulating water and detects the temperature of the warm water supplied to a heating terminal. Other configurations are the same as those in the first embodiment.

  The operation and action of the hot water heater configured as described above will be described below. The hot water temperature control of the hot water supply circuit is the same as in the first embodiment. When the detected temperature of the hot water supply heat exchange sensor 5 reaches the initial hot water supply heat exchange sensor control temperature, the detected temperature of the heating outlet sensor 22 is compared with the required heating temperature. The opening degree of the heating bypass valve is changed corresponding to the detected temperature of the heating outlet sensor 22 with respect to the heating required temperature.

  Thereby, the heat exchanger flow rate of the heating circuit changes, the absorption balance of heat on the hot water supply side and the heating side in the passage in the heat exchanger can be changed, and the appliance outlet hot water temperature for hot water supply and heating can be controlled. .

  As described above, the hot water supply / room heating device according to the present invention is configured to optimally control the hot water supply flow rate and the heating flow rate in the heat exchanger in the single can / two water heat exchanger configuration of the hot water supply circuit and the heating circuit. The heat absorption balance of the heating circuit is adjusted to enable simultaneous use of hot water supply and heating, and is not limited to the combination of hot water supply and heating, and can be applied to simultaneous operation of hot water supply and bath.

The block diagram of the hot-water supply heating apparatus in Embodiment 1 of this invention Configuration diagram of hot water heater in Embodiment 2 of the present invention The block diagram of the hot-water supply heating apparatus in Embodiment 3 of this invention Configuration diagram of a conventional hot water heater / heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water supply circuit 2 Water quantity sensor 3 Incoming water temperature sensor 4 Heat exchanger 5 Hot water supply heat exchange sensor 6 Hot water supply bypass circuit 7 Hot water supply temperature sensor 8 Hot water supply bypass valve 9 Water quantity control valve 10 Heating circuit 11 Heating pump 12 Heating heat exchange sensor 13 Combustion part 15 Control unit

Claims (5)

Hot water supply comprising a heat exchanger in which a hot water supply circuit and a heating circuit are configured in one can, a combustion section for heating the heat exchanger, and a combustion control means for controlling combustion in response to requests for hot water supply and heating operation In the heating device, the hot water supply circuit includes an incoming water temperature sensor that detects a hot water temperature, a hot water heat exchange sensor that detects a heat exchanger outlet temperature of the hot water circuit, a hot water temperature sensor that detects a hot water temperature, and a hot water circuit A flow rate sensor that detects the flow rate of the hot water supply circuit, a hot water supply bypass circuit that bypasses the heat exchanger inlet and outlet sides of the hot water supply circuit, a water amount control valve that controls the amount of water in the hot water supply circuit, and a bypass flow rate of the hot water supply bypass circuit The heating circuit is composed of a heating pump that circulates the heating water and a heating heat exchange sensor that detects the heat exchanger outlet temperature of the heating circuit, and the combustion control means And a flow rate variable means for varying the heat exchanger flow rate of the hot water supply circuit in accordance with the heat exchanger outlet temperature of the heating circuit during simultaneous use of heating and heating, the flow rate variable means having a low heat exchanger outlet temperature of the heating circuit When the hot water supply and heating device is configured to change the heat absorption balance between the hot water supply circuit and the heating circuit in the heat exchanger by controlling to reduce the flow rate of the heat exchanger in the hot water supply circuit. The temperature of the heat exchanger of the hot water supply circuit is variably controlled by changing the flow rate of the hot water supply bypass circuit by switching the control temperature of the hot water supply heat exchange sensor corresponding to the temperature detected by the heating heat exchange sensor. Item 2. A hot water supply / heating device according to item 1. The hot water supply according to claim 1, wherein a DC pump is used as the heating pump, and the heat exchanger flow rate of the heating circuit is variably controlled by changing the number of rotations of the pump in accordance with the temperature detected by the heating heat exchange sensor. Heating device. An in-machine circulation flow rate control valve that controls the in-machine circulation rate is installed in the in-machine circulation circuit of the heating circuit, and the in-machine circulation flow rate is varied according to the temperature detected by the heating heat exchange sensor, thereby reducing the heat exchanger flow rate in the heating circuit. 2. The hot water supply and heating device according to claim 1, wherein the hot water heating and heating device is variably controlled. The heating circuit includes a heating bypass circuit that bypasses the heat exchanger, a heating bypass valve that controls a bypass flow rate of the heating bypass circuit, and a heating outlet sensor that detects a circulating water temperature after joining the heating bypass. The hot water heater / heater according to claim 1, wherein the flow rate of the heat exchanger in the heating circuit is variably controlled by changing the heating bypass ratio corresponding to the detected temperature.

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