JP5305714B2 - Hot water heating system - Google Patents

Description

  The present invention relates to a hot water supply / heating system including a heat exchanger that heats a fluid such as water or brine (antifreeze) by a refrigerant circulated in a heat pump cycle, and more particularly to a technique for performing heating control suitable for hot water supply. Is.

Conventionally, it has a heat pump cycle connected to a compressor, expansion valve, water heat exchanger, outdoor air heat exchanger, etc., and it can be used for hot water supply, bathroom, heating, etc. by heat exchange with the refrigerant circulated in the heat pump cycle. A heat pump type hot water heater (system) for heating water to be used is known.
In addition, as an example of a hot water heating / heating system using such a heat pump type hot water heater, a refrigerant circuit of a heat pump including a compressor, a refrigerant water heat exchanger, an expansion valve, and an atmospheric heat exchanger, and a hot water storage tank And a heat pump bath water heater comprising a hot water supply circuit having a first pump and a refrigerant water heat exchanger, a bathtub, a bathtub circuit having a second pump and a refrigerant water heat exchanger, A heat pump bath water heater provided with an integrated refrigerant water heat exchanger that performs heat exchange between the refrigerant circuit, the hot water supply circuit, and the bathtub circuit is known (Patent Document 1).
In such a conventional heat pump bath water heater, referring to FIG. 7, when the hot water storage tank 65 is heated, the compressor 61 is operated and the refrigerant is exchanged with the refrigerant water heat exchanger 62, the expansion valve 63, and the atmospheric heat exchange. The data is sent in the order of the device 64. The first pump 71b is operated, and heat is radiated from the refrigerant to water inside the refrigerant water heat exchanger 62, and the blower fan 66 is operated from the atmospheric heat exchanger 64 to absorb heat from the atmosphere. When the water in the bathtub 70 is heated, the second pump 71a is operated in the same way as when the hot water storage tank 65 is heated, and heat is dissipated from the refrigerant to the water inside the refrigerant water heat exchanger 62 and heated. Will be.
In the conventional heat pump bath water heater, a command to operate the hot water supply circuit 68 and the bathtub circuit 69 at the same time (when the faucet is twisted in the hot water supply circuit 68 or when the additional cooking button is pressed in the bathtub circuit 69) is issued. In such a case, the hot water supply circuit 68 is prioritized. That is, in this case, the second pump 71a is stopped and the first pump 71b is operated. When the hot water supply is completed, the first pump 71b is stopped and the second pump 71a is driven.
The reason for performing such control is that according to the above-mentioned Patent Document 1, since the heat exchanger is integrated, if the water temperature in the bathtub 70 is low, the temperature of the hot water to be supplied decreases and the necessary hot water temperature is obtained. It is explained that it is to prevent it from being done.
Further, in such a conventional heat pump bath water heater, the refrigerant water heat exchanger 62 is an integrated heat exchanger that can exchange heat between the refrigerant circuit 67, the hot water supply circuit 68, and the bathtub circuit 69 as described above. An excellent heat pump bath water heater is provided in that the system can be simplified and the system can be made inexpensive, such as the on-off valve is unnecessary.
JP 2003-65602 A

  However, in the conventional heat pump bath water heater, the refrigerant water heat exchanger 62 is integrated with the refrigerant circuit 67, the hot water supply circuit 68 with a relatively small amount of hot water used, and the bathtub circuit 69 with a relatively small amount of hot water used. It is a heat exchanger and is not applicable to a floor heating circuit that uses a large amount of hot water, for example, and a hot water supply and heating system that heats a hot water supply circuit that uses a small amount of hot water, such as a single refrigerant circuit. There are the following specific problems in hot water heating and heating systems that use a large amount of hot water, for example, a floor heating circuit, and low hot water consumption, for example, a hot water supply circuit that is heated by a single refrigerant circuit. This is because the system as described in Patent Document 1 cannot be solved.

This is because the floor heater 110 and the hot water storage tank 106 are simultaneously heated by the hydrothermal exchanger 102 in which the refrigerant pipe, the hot water supply pipe, and the floor heating pipe are integrated. The hot water supply / heating system will be described with reference to FIG. Here, 101 is a compressor, 102 is a three-tube type water heat exchanger, 103 is an expansion valve, 104 is a refrigerant-air heat exchanger, 105 is a blower, 106 is a hot water storage tank, 107 is a water supply pump, 108 is A mixing valve 109 is a faucet as an example of a hot water supply device, 110 is a floor heater, and 111 is a floor heating pump.
The compressor 101, the expansion valve 103, the refrigerant-air heat exchanger 104, and the blower 105 constitute a heat pump cycle, and heat is supplied to the refrigerant pipe of the three-tube type refrigerant-water heat exchanger 102.
Further, by driving the floor heating pump 111, water or other medium heated by the water heat exchanger 102 is supplied to the floor heater 110, and floor heating is executed.
Further, when the water supply pump 107 is driven, water or other medium heated by the water heat exchanger 102 is supplied to the hot water storage tank 106, the hot water storage tank 106 is heated, and the faucet 109 is twisted to bring the hot water storage tank 106 to the hot water storage tank 106. The stored hot water is discharged from the tap 109.
In such a system, when the faucet 109 is twisted and the hot water in the hot water storage tank 106 is used while the floor heater 110 is being operated, and the hot water storage tank 106 needs to be boiled, a hot water supply circuit is connected to the refrigerant pipe. In the water heat exchanger 102 in which two circuits of the heating circuit and the heating circuit are in contact, hot water of different temperatures enters the hot water supply circuit and the heating circuit. For example, the hot water supply water temperature is 5 ° C. and the heating water input temperature is 35 ° C.

When the compressor 101 of the heat pump type heat source is operated in this state, the total incoming water temperature becomes higher than when the hot water storage tank 106 is only heated, so the pressure on the low pressure side becomes higher in the refrigeration cycle, and the water supply pump 107 If a large amount of water is allowed to flow to a region where the flow rate adjustment is difficult and the operation of the compressor 101 is not squeezed as much as possible, the pressure on the high pressure side will become too high.
In such an operating state, when the pressure on the high pressure side exceeds a certain value, the temperature of the compressor 101 becomes too high, and the operation must be stopped for protection.
Or, even if the operation is continued without stopping, the flow rate of water that can be controlled by the water supply pump 107 is determined, so that the temperature of the hot water to be heated becomes too high. There is a problem of becoming.

In order to solve such a problem, when the operation of the floor heater 110 and the boiling operation of the hot water storage tank 106 must be performed at the same time, either the floor heating or the boiling operation by the hot water storage tank 106 is performed. I have to stop one. In such a case, as in the conventional heat pump bath water heater disclosed in Patent Document 1, in the operation of a hot water supply device having a relatively small heat capacity (relatively small amount of hot water used) and the bath cooking operation, Even if the user stops, the user feels cold or cold.
For example, when the amount of hot water in the hot water storage tank 106 decreases when washing dishes with a hot water supply device, cold water immediately comes out of the faucet 109 and surprises the user.
In addition, if you try to cook while taking a bath, water is supplied, which can cause troubles such as the bath getting cold at once or suddenly cold water coming out of the shower.

In this regard, even if one of the devices has a small heating heat capacity as described above, if the other is a system that supplies heat to a device having a large heating heat capacity such as floor heating, the floor heating is stopped for a short time. However, the floor heating device has a large heating heat capacity, and it is difficult for the temperature to decrease in a short time. Therefore, it is considered that the problem that the user feels the cold sensitively does not occur. It is a characteristic of a hot water supply and heating system including a floor heating device that has a large heating heat capacity that does not feel particularly sensitive even when the heat supply is temporarily stopped.
And in a system including a heating target having a large heating heat capacity as described above and whose temperature is not easily lowered in a short time, heating to the heating target having a larger heating heat capacity is temporarily stopped. After supplying hot water to the hot water storage tank for a while and increasing the amount of hot water in the tank, the heating to the heating target with a large heating heat capacity is resumed. By repeating such control as necessary, dishwashing and Since the hot water supply process using a shower ends, after that, if we concentrate on heating the target with a large heating heat capacity, it is possible to continue the process without causing a rapid temperature drop for any target. It is thought that it will be possible.

  Accordingly, the present invention was devised based on the above situation, and in a hot water supply and heating system that supplies heat with a single heat pump refrigeration cycle for both hot water supply and floor heating, the hot water supply device and the floor heating device are provided. When both are driven, when the amount of hot water accumulated in the hot water storage tank on the hot water supply side decreases, floor heating with a large heating heat capacity is sacrificed (heating is temporarily stopped) The purpose of the present invention is to provide a hot water supply and heating system that gives priority to the boiling operation of the tank so that both hot water supply operation and floor heating operation can be achieved as much as possible.

To achieve the above object, a hot water supply and heating system of the present invention includes a heat pump thermal cycle, a hot water heater, a floor heater, and a floor heating circuit for circulating a liquid used in the floor heater, A hot water storage tank for storing hot water used in the water heater, a hot water circuit connected to the hot water heater and the hot water storage tank, and a refrigerant pipe for circulating the refrigerant used in the heat pump heat cycle. It is connected to a water heat exchanger that heats the liquid to be heated by heat exchange between the circulating refrigerant and the liquid to be heated, a lower layer, an upper layer, and a water heat exchanger of the hot water tank. A water circuit for circulating water in between, and a controller for controlling the flow rate of the liquid circulating in the floor heating circuit to the water heat exchanger, the water heat exchanger comprising a refrigerant pipe and a floor heating The floor heating pipes that make up the circuit and the water supply that make up the water circuit And the refrigerant pipe is shared by the floor heating pipe and the hot water supply pipe, and the liquid circulating through the floor heating pipe by the refrigerant circulating through the refrigerant pipe and the water circulating through the hot water supply pipe The controller is configured such that the floor heater and the hot water heater are simultaneously operated by the heat exchange of the water heat exchanger, and the amount of hot water stored in the hot water storage tank is the first place. When the amount is reduced to less than the fixed amount, the heat exchange between the refrigerant pipe and the hot water supply pipe is continued and the liquid in the floor heating circuit is supplied to the floor heating pipe of the water heat exchanger. Stop or decrease .
Preferably, the floor heating circuit includes a bypass pipe connecting an inlet and an outlet to the water heat exchanger of the floor heating circuit, and the liquid circulating in the floor heating circuit flows through the bypass pipe to generate water heat. The controller bypasses the exchanger and circulates in the floor heating circuit. The control unit controls the flow rate of the bypass pipe based on the amount of hot water stored in the hot water storage tank, thereby controlling the liquid floor in the floor heating circuit. The liquid supply to the heating pipe may be stopped or reduced.

Furthermore, the hot water supply and heating system of the present invention , when a gas heater is used, includes a heat pump heat cycle, a hot water heater, a floor heater, and a floor heating circuit for circulating the liquid used in the floor heater. Heating at least water or hot water in the hot water supply circuit among a hot water storage tank for storing hot water used in the water heater, a hot water circuit connected to the hot water heater and the hot water storage tank, and a hot water circuit and a floor heating circuit A water heat exchanger that includes a gas heater and a refrigerant pipe for circulating a refrigerant used in a heat pump thermal cycle, and heats the heated liquid by heat exchange between the refrigerant circulating in the refrigerant pipe and the heated liquid And a water circuit for circulating water between the water heat exchanger and the hot water tank, and a liquid water heat circulating in the floor heating circuit. Control to control the flow to the exchanger The water heat exchanger includes a refrigerant pipe, a floor heating pipe constituting the floor heating circuit, and a hot water supply pipe constituting the water circuit, and the refrigerant pipe is connected to the floor heating pipe and the hot water supply. It is configured to share heat with both the liquid circulating through the floor heating pipe and the water circulating through the hot water supply pipe by the refrigerant circulating through the refrigerant pipe. When the water heater and the water heater are operated simultaneously by the heat exchange of the water heat exchanger, and the amount of hot water stored in the hot water storage tank is larger than the second predetermined amount, the refrigerant circulating in the refrigerant pipe and the floor heating The amount of hot water stored in the hot water storage tank by continuing heat exchange with both the liquid circulating in the pipe and the water circulating in the hot water supply pipe, limiting heating by the gas heater of hot water or water flowing into the tapping circuit Decreases to an amount between the second predetermined amount and a third predetermined amount less than the second predetermined amount. While continuing heat exchange between the refrigerant pipe and hot water supply pipe, stop the control to supply the liquid in the floor heating circuit to the floor heating pipe of the water heat exchanger or reduce the liquid volume. If the amount of hot water stored in the hot water storage tank is less than the third predetermined amount, the hot water or water flowing into the hot water circuit is restricted. Control to heat with a gas heater.

Preferably, when the amount of hot water stored in the hot water storage tank becomes less than the third predetermined amount, in addition to the heating control by the gas heater, the water circuit is exchanged by heat exchange between the refrigerant pipe and the hot water supply pipe. water may be a performing control for heating flowing into.
Preferably, the gas heater is configured by incorporating a part of a hot water supply circuit in which hot water is supplied from a hot water storage tank of the hot water supply circuit to the hot water supply, and a liquid pipe connecting the water heat exchanger and the floor heater. It is good.

Preferably with, if the amount of water stored in the hot water storage tank is less than the third predetermined amount, to resume control of supply fluid to the liquid in the circuit for floor heating for floor heating pipes of the water heat exchanger , Stop the control to heat the water flowing into the water circuit by heat exchange between the refrigerant pipe and the hot water supply pipe, and start the control to heat the hot water or water flowing into the tapping circuit by the gas heater Also good.

  The second predetermined amount is detected when a temperature detected by a thermistor for detecting the temperature of water in the hot water storage tank is less than a predetermined value, and the third predetermined amount is provided in the gas heater; A hot water supply / heating system is also conceivable which is detected when the detection temperature of a hot water temperature thermistor for detecting the temperature of water or hot water flowing into the gas heater becomes lower than a predetermined value.

  According to the present invention, a heat pump heat cycle, a hot water heater, a floor heater, a hot water storage tank for storing hot water used in the hot water heater, and a hot water circuit connected to the hot water heater and the hot water storage tank. A water circuit connected to a lower layer and an upper layer of the hot water storage tank, a refrigerant pipe through which a refrigerant used in the heat pump thermal cycle circulates, the water circuit, and a liquid used in the floor heater In a hot water supply and heating system comprising a circulating floor heating circuit, the refrigerant pipe, and a water heat exchanger for exchanging heat between the water circuit and the floor heating circuit, the floor heater and the water heater, Are operated simultaneously by the water heat exchanger, and the amount of hot water stored in the hot water storage tank is reduced to an amount less than a first predetermined amount, between the refrigerant pipe and the water circuit. While continuing the heat exchange, Since it is configured as a hot water supply and heating system characterized by performing control to stop or reduce the supply of liquid in the heating circuit to the water heat exchanger, both the hot water supply device and the floor heating device are When the amount of hot water accumulated in the hot water storage tank on the hot water supply side is reduced when it is being driven, the floor heating with a large heating heat capacity is sacrificed (heating is temporarily stopped) and the hot water tank is boiled. There is provided a hot water supply / heating system that gives priority to the raising operation and can balance the hot water supply operation with the floor heating operation without stopping the hot water supply operation as much as possible.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
FIG. 1 is a block diagram showing a schematic configuration of a heat pump hot water heater / heater X according to an embodiment of the present invention, and FIG. 2 is a diagram of the heat pump hot water heater / heater X according to an embodiment of the present invention. FIG. 3 is a block diagram showing a schematic configuration, FIG. 3 is a block diagram showing a schematic configuration of a heat pump hot water heater / heater X according to an embodiment of the present invention, and FIG. 4 is a heat pump hot water supply according to an embodiment of the present invention. FIG. 5 is a block diagram showing a schematic configuration of the heater X, FIG. 5 is a block diagram showing a schematic configuration of a heat pump hot water heater Y according to an embodiment of the present invention equipped with a gas heater, and FIG. FIG. 7 is a block diagram showing a schematic configuration of a conventional heat pump hot water heater / heater. FIG. 7 is a block diagram showing a schematic configuration of a conventional heat pump hot water heater / heater.
First, the schematic configuration of the heat pump hot water supply / room heater X according to the embodiment of the present invention will be described with reference to FIG. In the present embodiment, a case where the heat pump hot water heater / heater X has a hot water supply function for supplying hot water and a floor heating function for performing floor heating will be described as an example.

As shown in FIG. 1, the heat pump hot water heater / heater X is roughly divided into a heat pump heat cycle (refrigeration cycle) A in which refrigerant is circulated, a hot water supply circuit B for supplying hot water, and floor heating. And a floor heating circuit C for this purpose. Here, as the refrigerant circulated in the heat pump cycle A, for example, a carbon dioxide refrigerant (a kind of natural refrigerant) such as CO ₂ refrigerant or an HFC refrigerant such as R410A is used.
The heat pump hot water heater / heater X includes a control unit 50 having a CPU, a RAM, a ROM, and the like, and is comprehensively controlled by the control unit 50. Specifically, the controller of the heat pump hot water heater / heater X controls the operation of the heat pump hot water heater / heater X based on the temperature in the hot water storage tank 6 detected by a temperature sensor 15a described later.

The heat pump heat cycle A includes a compressor 1 that compresses refrigerant, and a water heat exchanger 2 that heats the water by exchanging heat between the refrigerant flowing out of the compressor 1 and water (the water in the present invention). An example of a heat exchanger), an expansion valve 3 that expands the refrigerant that has flowed out of the water heat exchanger 2, and heat that is exchanged between the refrigerant expanded by the expansion valve 3 and outdoor air. An outdoor air heat exchanger 4 is provided. 5 is a blower which makes the said outdoor air heat exchanger 4 contact air.
The water heat exchanger 2 includes a refrigerant pipe 2b through which a refrigerant used in the heat pump heat cycle A circulates, a water pipe 2c which is a part of a water circuit 9b described later, and a liquid used in the floor heater 110. It is a heat exchanger that includes a water pipe 2a of a circulating floor heating circuit, and exchanges heat between the refrigerant pipe 2b, the water pipe 2a, and the water pipe 2c.

The hot water supply circuit B includes a hot water storage tank 6 for storing hot water (for example, about 60 ° C.) heated in the water heat exchanger 2, and the hot water storage tank 6 through the water heat exchanger 2 from the lower layer of the hot water storage tank 6. The main components are a water supply pump 7 for circulating water in the upper layer, a water supply port 16, and a mixing valve 8 for mixing hot water from the hot water storage tank 6 and supplying it to the faucet 9.
A circuit that connects the faucet 9 and the hot water storage tank 6, which is an example of a hot water heater, is called a hot water supply circuit 9 a, and is connected to a lower layer and an upper layer of the hot water storage tank 6, and the water heat exchanger 2 and the hot water storage tank 6 are connected. A circuit that circulates hot water between the two is called a water circuit 9b.

The floor heating circuit C includes a floor heater 110 that performs floor heating using hot water heated in the water heat exchanger 2, and a floor heating for circulating water through the water heat exchanger 2 and the floor heater 110. And a pump 11. In the floor heating circuit C, a case where brine (antifreeze) is used instead of water may be considered.
Since the basic operation of the hot water supply circuit B and the floor heating circuit C is not different from the conventional one, the description thereof is omitted here.

  In the heat pump hot water supply / room heater X according to the embodiment of the present invention, the bypass connecting the inlet and the outlet to the water heat exchanger 2 of the water pipe 2a on the floor heater 110 side passing through the water heat exchanger 2 is provided. What is new is that a pipe 110b is provided, and a bypass control valve 12a such as an electromagnetic valve for adjusting the flow rate of fluid passing through the bypass pipe 110b is provided in the middle of the bypass pipe 110b. Further, the bypass control valve 12a is also controlled based on the control unit 50 that receives a signal from the temperature sensor 15a provided at a predetermined height in the hot water storage tank 6 as described above.

A further new point of the heat pump hot water heater / heater X is that the controller 50 is configured such that the floor heater 110 and the hot water heater such as the faucet 9 are simultaneously operated by the water heat exchanger 2 and the hot water storage When the amount of hot water stored in the tank 6 has decreased to an amount smaller than the first predetermined amount detected by the temperature sensor 15a, the refrigerant in the water heat exchanger 2 constituting the heat pump heat cycle A The heat exchange between the pipe 2b and the water pipe 2c in the water heat exchanger 2 constituting the water circuit 9b is continued, and the liquid in the floor heating circuit C is supplied to the water heat exchanger 2 It is a point to perform control to stop the.
This will be described in detail.

In the hot water storage tank 6, water and hot water do not actually mix, so the boundary is clearly partitioned, and the above-mentioned boundary may rise by using hot water in the upper layer. Are known. Therefore, if the temperature sensor 15a is provided at a predetermined height in the hot water storage tank 6 and the temperature of the hot water in contact with the temperature sensor 15a is measured as in this embodiment, the hot water storage tank 6 stores the temperature. The amount of hot water can be detected. The temperature sensor 15a has such a function. By transmitting a signal from the temperature sensor 15a to the control unit 50, the control unit 50 can perform control according to the amount of hot water in the hot water storage tank 6.
In this way, the amount of hot water detected by the temperature sensor 15a is the first in a state where the floor heater 110 and the faucet 9 which is an example of the water heater are simultaneously operated by the water heat exchanger 2. , That is, a signal indicating that the amount has decreased to an amount smaller than the installation position of the temperature sensor 15 a is transmitted to the control unit 50. Upon receiving this signal, the control unit 50 continues to drive the water supply pump 7 that performs heat exchange between the refrigerant pipe 2b and the water pipe 2c on the water circuit 9b side (the hot water supply operation is continued). In order to stop or reduce the supply of the liquid in the floor heating circuit C to the water heat exchanger 2, the floor heating pump 11 is stopped or the bypass control valve 12a is released (or the opening degree is reduced). Adjust). As a result, all or part of the hot water flowing through the water pipe 110a for floor heating flows around the water heat exchanger 2 to stop the supply of hot water to the floor heater 110, or floor heating. Control to reduce the amount of hot water flowing through the machine 110 is performed.

By this control, the operation of the floor heater 110 is stopped or adjusted so that the amount of hot water to be supplied is reduced. The floor heater 110 includes a long water pipe, and the indoor air has a large heat capacity. Therefore, the heating heat capacity of the floor heater 110 as a whole is large, and the room temperature does not decrease immediately. For this reason, even if the floor heater 110 is stopped, the user hardly feels cold for at least several minutes or ten minutes.
On the other hand, on the hot water supply side, the amount of hot water in the hot water storage tank 6 has decreased to the first predetermined amount, that is, an amount smaller than the installation position of the temperature sensor 15a at this time, and the hot water supply operation is continued. Although it has become difficult, since hot water supply to the floor heater 110 side sharing the water heat exchanger 2 has been stopped or the amount of hot water supply has been reduced as described above, the hot water supply operation can be continued. In the meantime, the amount of hot water in the hot water storage tank 6 can be recovered.
Usually, the hot water supply operation such as using a dishwasher or a shower is completed within a few minutes. Therefore, even if hot water supply to the floor heater 110 is resumed several minutes after the stop of the floor heater 110 or the start of the decrease in the amount of hot water, the hot water supply operation such as dishwashing is completed at that time. , Most of the heating capacity of the water heat exchanger 2 can be used on the floor heater 110 side, and the heating effect is not reduced.
By this processing, a hot water supply / heating system is provided that allows the user to continue the hot water supply operation without feeling cold on the floor heater 110 side.
Such a case can be achieved when the water heat exchanger 2 is shared by the floor heating circuit C having a large heating heat capacity and the hot water supply circuit B having a small heating heat capacity, as described in Patent Document 1. When two hot water supply devices with small heating heat capacities are shared, cold water will be supplied immediately even if either hot water supply device is stopped, so the system must be unbearable for the user. I don't get it.

In the embodiment of FIG. 1 described above, the amount of the floor heating fluid passing through the water pipe 2a in the water heat exchanger 2 is adjusted by the bypass control valve 12a or the floor heating pump 11 provided in the bypass pipe 110b. The floor heater 110 is controlled, but the method of controlling the floor heater 110 is not limited to this.
For example, in the example of FIG. 2, a bypass control valve 12a similar to that of FIG. 1 is provided in the bypass pipe 110b, and an electromagnetic valve 12b for flow control is provided in parallel with the bypass control valve 12a at the inflow portion to the water pipe 2a. The opening degree of the two valves 12a and 12b is controlled by the control unit 50. In this case, similarly to the case of FIG. 1, the discharge amount control of the floor heating pump 11 and the control of the two valves may be combined.

Further, as another method, instead of the bypass control valve 12a of FIG. 1 or the combination of the bypass control valve 12a and the electromagnetic valve 12b of FIG. 2, as shown in FIG. 3, a bypass pipe at the inflow portion to the water pipe 2a is used. A three-way valve 12c may be provided at a branch portion with respect to 110b, thereby adjusting the ratio of the amount of fluid flowing to the water pipe 2a and the amount of fluid flowing to the bypass pipe 110b. Of course, combined use with adjustment by the floor heating pump 11 is also conceivable.
Furthermore, as another method, a flow rate adjusting valve 12d as shown in FIG. 4 may be used instead of the three-way valve 12c shown in FIG.
These flow rate adjustment methods can be similarly applied to the embodiment of FIG. 5 to be described later.

Next, a heat pump hot water heater Y according to an embodiment in which a gas heater is incorporated in the hot water heater system X shown in FIGS. 1 to 4 will be described.
The heat pump type hot water heater / heater Y roughly includes a heat pump cycle (refrigeration cycle) A in which refrigerant is circulated, a hot water supply circuit B for supplying hot water, and a floor heating circuit C for performing floor heating. The control unit 50 having a CPU, a RAM, a ROM, and the like is provided, and the control unit 50 performs overall control, similar to the embodiment shown in FIGS. It is.
Specifically, the heat pump hot water heater / heater Y includes a compressor 1 that compresses refrigerant, and a water heat exchanger that heats the water by exchanging heat between the refrigerant and water flowing out of the compressor 1. 2, an expansion valve 3 for expanding the refrigerant flowing out of the water heat exchanger 2, and an outdoor air heat exchange for heating the refrigerant by exchanging heat between the refrigerant expanded by the expansion valve 3 and the outdoor air A hot water storage tank 6 for storing hot water (for example, about 60 ° C.) after the hot water supply circuit B is heated in the water heat exchanger 2, and water heat from the lower layer of the hot water storage tank 6. A water supply pump 7 for circulating water to the upper layer of the hot water storage tank 6 through the exchanger 14, a mixing valve 8 for mixing water from the water supply port 16 and hot water from the hot water storage tank 6 and supplying the water to the faucet 9. The main component, floor heating circuit C, is a water heat exchanger A floor heater 110 for performing floor heating using hot water after being heated in the water, a floor heat pump 2 for circulating water through the water heat exchanger 2 and the floor heater 110, and a bypass A bypass control valve 12a is provided in the pipe 110b, and an electromagnetic valve 12b for flow rate control is provided in parallel with the bypass control valve 12a at the inflow portion to the water pipe 2a, and the opening degree of the two valves 12a and 12b is controlled by the control portion. The control by 50 is the same as the embodiment shown in FIG.
In addition, although three floor heaters 110 are provided, this is not a particular feature and may be one or two. Therefore, these three floor heaters are collectively referred to as a floor heater 110.
Further, a circuit connecting the faucet 9 and the hot water storage tank 6 which is an example of a hot water supply device is called a hot water supply circuit 9a, and is connected to a lower layer and an upper layer of the hot water storage tank 6, and the water heat exchanger 2 and the hot water storage device are connected. The circuit for circulating hot water between the tank 6 and the tank 6 is also referred to as a water circuit 9b.

A new feature of this heat pump hot water heater Y is that the hot water storage tank 6 has two stages, a second predetermined amount related to the amount of hot water in the hot water storage tank 6 and a third predetermined amount smaller than the second predetermined amount. Two temperature sensors 15b and 15c for detecting the amount of hot water are mounted up and down, and signals from these sensors 15b and 15c are introduced into the control unit 50, the water heat exchanger 2 and the floor heater 110. The liquid pipe 110d for connecting the hot water tank 10 and the hot water circuit 9a from the hot water storage tank 6 to the faucet 9 are incorporated in the gas heater 14 controlled by the control unit 50, and the hot water is discharged from the floor heater 110 and the faucet 9. The hot water is structured to be heated by both the water heat exchanger 2 and the gas heater 14, and the floor heater 110 and the hot water heater (represented by the faucet 9) are the water. By heat exchanger 2 When the amount of hot water stored in the hot water storage tank has been reduced to a level between a second predetermined amount and a third predetermined amount less than the second predetermined amount. While continuing the heat exchange between the refrigerant pipe 2c of the exchanger 2 and the water circuit 9b, the control for supplying the liquid in the floor heating circuit C to the water heat exchanger 2 is stopped, When the amount is reduced and the amount of hot water stored in the hot water storage tank 6 becomes less than the third predetermined amount, the hot water or water flowing into the hot water circuit 9a is heated by the gas heater 14. It is a point to do.
This will be described in detail.

In the hot water storage tank 6, since the water and hot water do not actually mix as described above, the boundary is clearly partitioned, and when the upper layer hot water is used, the boundary rises. To go. Accordingly, as in this embodiment, the temperature sensors 15c and 15b are provided at a predetermined height position in the hot water storage tank 6 and at a predetermined height position lower than that, and these temperature sensors 15b, 15c are provided. By measuring the temperature of hot water in contact with the hot water, it is possible to detect changes in the amount of hot water stored in the hot water storage tank 6 in two stages.
The temperature sensors 15b and 15c have such functions. By transmitting a signal from the temperature sensors 15b and 15c to the control unit 50, the control unit 50 can perform control according to the amount of hot water in the hot water storage tank 6. I can do it.

  In this manner, when the hot water in the hot water storage tank 6 is reduced in a state where the floor heater 110 and the faucet 9 which is an example of the hot water heater are simultaneously operated by the water heat exchanger 2, The amount of hot water is detected by the second predetermined amount, that is, the second predetermined amount detected by the temperature sensor 15b, and the temperature sensor 15c located higher than the temperature sensor 15b by the temperature sensor 15b at the lower position. When it is determined by the control unit 50 that receives signals from these sensors 15b and 15c that the amount has decreased to an amount between the third predetermined amount smaller than the second predetermined amount, the control unit 50 The water supply pump 7 that performs heat exchange between the refrigerant pipe 2b and the water pipe 2c on the water circuit 9b side is continued (the hot water supply operation is continued), and the liquid in the floor heating circuit C is Hydrothermal In order to stop or reduce the amount of liquid supplied to the converter 2, the floor heating pump 11 which has been operated until then is stopped, or the floor heater which has been operated by controlling the bypass valve 12g and the electromagnetic valve 12f. The hot water that flows through the water pipe 110a to the 110 all or part of the hot water flows around the water heat exchanger 2 so that the hot water supply to the floor heater 110 is stopped or the hot water flows through the floor heater 110. Control is performed to reduce the amount of hot water.

  By this control, the operation of the floor heater 110 is stopped or adjusted so that the amount of hot water to be supplied is reduced. However, since the floor heater 110 has a long water pipe, the heating heat capacity is large and the heating is performed. The effect does not decrease immediately. Therefore, even if the floor heater 110 is stopped, the user hardly feels cold for at least several minutes or several tens of minutes. On the other hand, on the hot water supply side, at this time, the amount of hot water in the hot water storage tank 6 has decreased to the first predetermined amount, that is, an amount smaller than the installation position of the temperature sensor 15a. The hot water supply to the floor heater 110 sharing the water heat exchanger 2 has been stopped or the hot water supply amount has been reduced, so that the hot water supply operation can be continued. Can be recovered. Normally, the hot water supply operation such as using a dishwasher or a shower is completed in a few minutes. Therefore, even if hot water supply to the floor heater 110 is resumed several minutes after the stop of the above-described floor heater 110 or the start of a decrease in the amount of hot water supply. At that time, since the hot water supply operation such as dishwashing is finished, most of the heating capacity of the water heat exchanger 2 can be used for the floor heater 110 side thereafter.

  By this processing, a hot water supply / heating system is provided that allows the user to continue the hot water supply operation without feeling cold on the floor heater 110 side.

  Compared with the case where water is heated with a heat pump type water heat exchanger, the gas is less efficient, so it is economical to exchange heat with the heat pump type water heat exchanger as much as possible. If the hot water supply capacity of the heat pump water heat exchanger is increased, it will be possible to cope with the increased amount of hot water used. However, when the installation space is taken into consideration, it cannot be made so large. Therefore, in this embodiment, when the amount of hot water in the hot water storage tank 6 is between the first predetermined hot water amount and the second predetermined hot water amount, a boiling operation is performed with a heat pump type water heat exchanger, and the hot water amount is less than the second hot water amount. When it comes to, a gas heater is used. In this way, when a large amount of hot water is used and the amount of hot water in the hot water storage tank 6 is reduced and cannot be covered with a heat pump type water heat exchanger, a large amount of hot water can be boiled even in a small installation space. This can be dealt with by using the gas heater 14. When the amount of hot water used is small, gas can not be used because it can be covered by a heat pump cycle. In this way, the energy saving performance can be improved as compared with the case where only gas is used. Also, when the usage is large, it is not necessary to stop the floor heating because the water is boiled with gas.

  As already described in the embodiment of FIG. 1, this is possible because the water heat exchanger 2 is shared by the floor heating circuit C having a large heating heat capacity and the hot water supply circuit B having a small heating heat capacity. When two hot water supply devices having a small heating heat capacity are shared as described in Patent Document 1, cold water will be supplied immediately even if any hot water supply device is stopped. , The user immediately feels cold and cold, and must be a system that cannot withstand use.

  If such a state continues and the amount of hot water in the hot water storage tank 6 is recovered and exceeds the second predetermined amount, the controller 50 detects that the bypass valve 12g The liquid supplied to the floor heater 110 is also returned to the state of being heated by the water heat exchanger 2 by controlling the electromagnetic valve 12f.

  However, when the operation of the floor heater 110 is stopped or the control for reducing the amount of hot water to be supplied is performed, a larger amount of hot water is discharged from the faucet 9 and the amount of hot water in the hot water storage tank 6 is further reduced. In other words, when the temperature sensor 15c positioned above the lower temperature sensor 15b detects a layer that changes from hot water to water, that is, the temperature sensor 15c determines the amount of hot water in the hot water storage tank 6. When it is detected that the amount has become less than the third predetermined amount, the control unit 50 starts the operation of the gas heater 14, and the hot water or water flowing into the tapping circuit 9 a is sent by the gas heater. Controls to cook and heat.

That is, in this case, when the amount of hot water stored in the hot water storage tank 6 becomes less than the third predetermined amount, the heating control by the gas heater 14, the refrigerant pipe 2b, the water circuit 9b, Both are controlled to heat the water flowing into the water circuit 9b by heat exchange between them, and even when a large amount of hot water is discharged from the faucet 9, it is considered that the hot water supply temperature does not decrease. ing.
However, although the gas heater 14 is inferior in economic efficiency, the amount of heat generated by the gas heater 14 is very large. Therefore, if the gas heater 14 starts to operate, both the floor heater and the hot water heater are connected to the gas heater 14. There is a case where it may be allowed to perform the operation.
Alternatively, when the amount of hot water stored in the hot water storage tank 6 becomes less than the third predetermined value, the control for supplying the liquid in the floor heating circuit C to the water heat exchanger 2 is resumed. , The control of heating the water flowing into the water circuit 9b by heat exchange between the refrigerant pipe 2b and the water circuit 9b is stopped, and the hot water or water flowing into the tapping circuit 9a is sent to the gas heater 14 The heating control may be started. That is, floor heating is performed by a heat pump heat exchanger, and hot water is performed by a gas heater.
In the present embodiment, the third predetermined value is detected by the temperature sensor 15c provided in the hot water storage tank 6 (an example of the hot water temperature thermistor in the present invention), but the temperature sensor 15c is detected by the gas heater 14. And the hot water storage tank 6 side of the hot water supply circuit 9a may be provided at a portion connecting them.
Thus, in a system in which a gas heater is installed before the hot water stored in the tank is discharged from the faucet, the final heating temperature control is performed by the gas heater. Therefore, if the hot water temperature control is to be performed more accurately and speedily, it is more accurate to detect and control the temperature of the hot water flowing into the gas heater rather than the temperature at the top of the tank. That is, if the temperature of the hot water flowing into the gas heater is detected and controlled rather than the temperature at the upper part of the tank as described above, the temperature of the hot water flowing into the gas heater 14 is more controlled by the gas heater 14. Since it can detect in a near location, the hot water temperature control by the gas heater 14 can be performed more accurately.

1 is a block diagram showing a schematic configuration of a heat pump hot water supply / room heater X according to an embodiment of the present invention. 1 is a block diagram showing a schematic configuration of a heat pump hot water supply / room heater X according to an embodiment of the present invention. 1 is a block diagram showing a schematic configuration of a heat pump hot water supply / room heater X according to an embodiment of the present invention. 1 is a block diagram showing a schematic configuration of a heat pump hot water supply / room heater X according to an embodiment of the present invention. The block diagram which shows schematic structure of the heat pump type hot water supply heater Y which concerns on one embodiment of this invention provided with the gas heater. The block diagram which shows schematic structure of a virtual heat pump type hot-water supply heater. The block diagram which shows schematic structure of the conventional heat pump type hot-water supply heater.

Explanation of symbols

A: Heat pump thermal cycle B: Hot water supply circuit C: Floor heating circuit X: Heat pump hot water heater / heater Y: Heat pump hot water heater / heater 1: Compressor 2: Water heat exchanger 2a: Water pipe 2b: Refrigerant pipe 2c: Water pipe 3 : Expansion valve 4: Outdoor air heat exchanger 5: Blower 6: Hot water storage tank 7: Water supply pump 8: Mixing valve 9: Faucet 9a: Hot water circuit 9b: Water circuit 11: Floor heating pump 11d: Liquid pipe 12a: Bypass control valve 12b: Solenoid valve 12c: 3-way valve 14: Gas heater 15a: Temperature sensor 50: Control unit 110: Floor heater 110a: Water pipe 110b for floor heating: Bypass pipe

Claims (6)

A hot water and heating system,
Heat pump thermal cycle,
A water heater,
Floor heaters,
A floor heating circuit for circulating the liquid used in the floor heater;
A hot water storage tank for storing hot water used in the water heater;
A hot water circuit connected to the water heater and the hot water storage tank;
A water heat exchanger that includes a refrigerant pipe for circulating the refrigerant used in the heat pump type heat cycle, and heats the heated liquid by heat exchange between the refrigerant circulating in the refrigerant pipe and the heated liquid;
A water circuit connected to the lower and upper layers of the hot water storage tank and the water heat exchanger, for circulating water between the water heat exchanger and the hot water storage tank;
A controller for controlling the flow rate of the liquid circulating in the floor heating circuit to the water heat exchanger,
The water heat exchanger includes the refrigerant pipe, a floor heating pipe constituting the floor heating circuit, and a hot water supply pipe constituting the water circuit, and the refrigerant pipe is connected to the floor heating pipe. It is configured to be shared with the hot water supply pipe, and is configured to be able to exchange heat with both the liquid circulating through the floor heating pipe and the water circulating through the hot water supply pipe by the refrigerant circulating through the refrigerant pipe,
The controller is configured such that the floor heater and the water heater are simultaneously operated by heat exchange of the water heat exchanger, and the amount of hot water stored in the hot water storage tank is less than a first predetermined amount. When it decreases, the heat exchange between the refrigerant pipe and the hot water supply pipe is continued, and the liquid in the floor heating circuit is supplied to the floor heating pipe of the water heat exchanger. a stop or, or reduce,
The floor heating circuit is:
Including a bypass pipe connecting an inlet and an outlet to the water heat exchanger of the floor heating circuit;
The liquid circulating in the floor heating circuit circulates in the floor heating circuit bypassing the water heat exchanger by flowing through the bypass pipe,
The control unit stops the supply of the liquid in the floor heating circuit to the floor heating pipe by controlling the flow rate of the bypass pipe based on the amount of hot water stored in the hot water storage tank. Or reduce,
A hot water supply and heating system. A hot water and heating system,
Heat pump thermal cycle,
A water heater,
Floor heaters,
A floor heating circuit for circulating the liquid used in the floor heater;
A hot water storage tank for storing hot water used in the water heater;
A hot water circuit connected to the water heater and the hot water storage tank;
A gas heater for heating at least water or hot water in the hot water circuit out of the hot water circuit and the floor heating circuit;
A water heat exchanger that includes a refrigerant pipe for circulating the refrigerant used in the heat pump type heat cycle, and heats the heated liquid by heat exchange between the refrigerant circulating in the refrigerant pipe and the heated liquid;
A water circuit connected to the lower and upper layers of the hot water storage tank and the water heat exchanger, for circulating water between the water heat exchanger and the hot water storage tank;
A controller for controlling the flow rate of the liquid circulating in the floor heating circuit to the water heat exchanger,
The water heat exchanger includes the refrigerant pipe, a floor heating pipe constituting the floor heating circuit, and a hot water supply pipe constituting the water circuit, and the refrigerant pipe is connected to the floor heating pipe. It is configured to be shared with the hot water supply pipe, and is configured to be able to exchange heat with both the liquid circulating through the floor heating pipe and the water circulating through the hot water supply pipe by the refrigerant circulating through the refrigerant pipe,
When the floor heater and the water heater are simultaneously operated by heat exchange of the water heat exchanger, and the amount of hot water stored in the hot water storage tank is larger than a second predetermined amount, the control unit The hot water or the water gas flowing into the hot water circuit continues to exchange heat between the refrigerant circulating through the refrigerant pipe and the liquid circulating through the floor heating pipe and the water circulating through the hot water supply pipe. Limiting heating by the heater,
When the amount of hot water stored in the hot water storage tank has decreased to an amount between a second predetermined amount and a third predetermined amount less than the second predetermined amount, the refrigerant pipe, the hot water supply pipe, And the control of supplying the liquid in the floor heating circuit to the floor heating pipe of the water heat exchanger is stopped or the amount of liquid is reduced, Limit the heating of hot water or water flowing into the circuit by the gas heater,
Wherein when the amount of water stored in the hot water storage tank is less than a predetermined amount of the third, it has rows control for heating hot water or water flowing into the hot water circuit by the gas heating device,
When the amount of hot water stored in the hot water storage tank becomes less than the third predetermined amount, the control for supplying the liquid in the floor heating circuit to the floor heating pipe of the water heat exchanger is resumed. At the same time, the control of heating the water flowing into the water circuit is stopped by heat exchange between the refrigerant pipe and the hot water supply pipe, and the hot water or water flowing into the tapping circuit is heated by the gas heater. Start control,
A hot water supply and heating system. A hot water and heating system,
Heat pump thermal cycle,
A water heater,
Floor heaters,
A floor heating circuit for circulating the liquid used in the floor heater;
A hot water storage tank for storing hot water used in the water heater;
A hot water circuit connected to the water heater and the hot water storage tank;
A gas heater for heating at least water or hot water in the hot water circuit out of the hot water circuit and the floor heating circuit;
A water heat exchanger that includes a refrigerant pipe for circulating the refrigerant used in the heat pump type heat cycle, and heats the heated liquid by heat exchange between the refrigerant circulating in the refrigerant pipe and the heated liquid;
A water circuit connected to the lower and upper layers of the hot water storage tank and the water heat exchanger, for circulating water between the water heat exchanger and the hot water storage tank;
A controller for controlling the flow rate of the liquid circulating in the floor heating circuit to the water heat exchanger,
The water heat exchanger includes the refrigerant pipe, a floor heating pipe constituting the floor heating circuit, and a hot water supply pipe constituting the water circuit, and the refrigerant pipe is connected to the floor heating pipe. It is configured to be shared with the hot water supply pipe, and is configured to be able to exchange heat with both the liquid circulating through the floor heating pipe and the water circulating through the hot water supply pipe by the refrigerant circulating through the refrigerant pipe,
When the floor heater and the water heater are simultaneously operated by heat exchange of the water heat exchanger, and the amount of hot water stored in the hot water storage tank is larger than a second predetermined amount, the control unit The hot water or the water gas flowing into the hot water circuit continues to exchange heat between the refrigerant circulating through the refrigerant pipe and the liquid circulating through the floor heating pipe and the water circulating through the hot water supply pipe. Limiting heating by the heater,
When the amount of hot water stored in the hot water storage tank has decreased to an amount between a second predetermined amount and a third predetermined amount less than the second predetermined amount, the refrigerant pipe, the hot water supply pipe, And the control of supplying the liquid in the floor heating circuit to the floor heating pipe of the water heat exchanger is stopped or the amount of liquid is reduced, Limit the heating of hot water or water flowing into the circuit by the gas heater,
Wherein when the amount of water stored in the hot water storage tank is less than a predetermined amount of the third, it has rows control for heating hot water or water flowing into the hot water circuit by the gas heating device,
The second predetermined amount is detected when a temperature detected by a hot water thermistor that detects the temperature of water in the hot water storage tank is less than a predetermined value, and the third predetermined amount is provided in the gas heater. The temperature detected by the hot water thermistor for detecting the temperature of the water or hot water flowing into the gas heater is less than a predetermined value.
A hot water supply and heating system. A hot water and heating system,
Heat pump thermal cycle,
A water heater,
Floor heaters,
A floor heating circuit for circulating the liquid used in the floor heater;
A hot water storage tank for storing hot water used in the water heater;
A hot water circuit connected to the water heater and the hot water storage tank;
A gas heater for heating at least water or hot water in the hot water circuit out of the hot water circuit and the floor heating circuit;
A water heat exchanger that includes a refrigerant pipe for circulating the refrigerant used in the heat pump type heat cycle, and heats the heated liquid by heat exchange between the refrigerant circulating in the refrigerant pipe and the heated liquid;
A water circuit connected to the lower and upper layers of the hot water storage tank and the water heat exchanger, for circulating water between the water heat exchanger and the hot water storage tank;
A controller for controlling the flow rate of the liquid circulating in the floor heating circuit to the water heat exchanger,
The water heat exchanger includes the refrigerant pipe, a floor heating pipe constituting the floor heating circuit, and a hot water supply pipe constituting the water circuit, and the refrigerant pipe is connected to the floor heating pipe. It is configured to be shared with the hot water supply pipe, and is configured to be able to exchange heat with both the liquid circulating through the floor heating pipe and the water circulating through the hot water supply pipe by the refrigerant circulating through the refrigerant pipe,
When the floor heater and the water heater are simultaneously operated by heat exchange of the water heat exchanger, and the amount of hot water stored in the hot water storage tank is larger than a second predetermined amount, the control unit The hot water or the water gas flowing into the hot water circuit continues to exchange heat between the refrigerant circulating through the refrigerant pipe and the liquid circulating through the floor heating pipe and the water circulating through the hot water supply pipe. Limiting heating by the heater,
When the amount of hot water stored in the hot water storage tank has decreased to an amount between a second predetermined amount and a third predetermined amount less than the second predetermined amount, the refrigerant pipe, the hot water supply pipe, And the control of supplying the liquid in the floor heating circuit to the floor heating pipe of the water heat exchanger is stopped or the amount of liquid is reduced, Limit the heating of hot water or water flowing into the circuit by the gas heater,
Wherein when the amount of water stored in the hot water storage tank is less than a predetermined amount of the third, it has rows control for heating hot water or water flowing into the hot water circuit by the gas heating device,
The floor heating circuit is:
Including a bypass pipe connecting an inlet and an outlet to the water heat exchanger of the floor heating circuit;
The liquid circulating in the floor heating circuit circulates in the floor heating circuit bypassing the water heat exchanger by flowing through the bypass pipe,
The control unit stops the supply of the liquid in the floor heating circuit to the floor heating pipe by controlling the flow rate of the bypass pipe based on the amount of hot water stored in the hot water storage tank. Or reduce,
A hot water supply and heating system. When the amount of hot water stored in the hot water storage tank becomes less than the third predetermined amount, in addition to heating control by the gas heater, heat exchange between the refrigerant pipe and the hot water supply pipe is performed. The hot water supply and heating system according to any one of claims 3 and 4, wherein control for heating water flowing into the water circuit is performed. The gas heater incorporates a part of the hot water circuit in which hot water is supplied from the hot water storage tank of the hot water circuit to the hot water supply device, and a liquid pipe connecting the water heat exchanger and the floor heater. Composed,
The hot water supply and heating system according to any one of claims 2 to 4 .

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