JPH01134166A - Heat-pump hot-water supply device - Google Patents

Abstract

PURPOSE: To reduce the manufacturing cost by stopping a water circulation pump and operating a condenser fan when the temperature of hot supply water in a heat storage tank reaches a set level thereby performing heat storage/hot water supply and indoor cooling surely. CONSTITUTION: When a temperature sensor 9 detects the temperature of hot supply water in a heat storage tank 5 exceeding a set level and delivers a controller 10 with a signal for switching to heat radiating operation, a water circulation pump 6 operating during heat storage/hot water supply operation is stopped and a condenser fan 20 is operated. When the hot supply water is not required to be heated, heat can be radiated from a refrigerant/water heat exchanger 2 to the outer air by stopping the pump 6 and operating the fan 20. Since an extra refrigerant circuit is not required during heat radiating operation, the installation space can be reduced while simplifying the system and heat storage/hot water supply and indoor cooling operations can be performed surely while reducing the cost significantly.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a heat pump water heater.

2. Description of the Related Art As shown in FIG. 3, a conventional heat pump water heater of this type connects a compressor 1, a refrigerant-to-water heat exchanger 2, an expansion valve 3, an indoor evaporator 4, and the compressor 1 in an annular manner. The heat storage tank 5
It was designed to cool the room while storing hot water. When storing heat in the heat storage tank 5, by driving the compressor 1 and the water circulation pump 6, the high temperature and high pressure refrigerant compressed by the compressor 1 is transferred to the closed electromagnetic valve A15.
The refrigerant does not flow into the refrigerant-to-water heat exchanger 2 through the solenoid valve 816, which is in the open state. Here, the refrigerant heats the hot water in the water circulation circuit, which is in a heat transfer relationship, and condenses and liquefies it. on the other hand,
The heated hot water supply water is sent to the heat storage tank 5 by the water circulation pump 6 and stored therein. The condensed refrigerant passes through the expansion valve 3 while being depressurized, and flows into the indoor evaporator 4 at a low temperature and low pressure. The refrigerant that has flowed into the indoor evaporator 4 absorbs heat from the indoor air while being blown by an indoor fan (also referred to as an evaporator fan) 7, and evaporates while lowering the indoor temperature. The vaporized refrigerant is sucked into the compressor 1 and compressed again.

However, if this heat storage and indoor cooling operation continues for a long time,
The temperature of the hot water stored in the heat storage tank 5 will rise significantly. Therefore, the temperature of the hot water stored in the heat storage tank 5 is detected by a temperature sensor 9, etc., and when the set temperature is reached, the water circulation circuit is stopped to prevent further heat accumulation, and A configuration that dissipates heat is desirable.

In order to radiate heat in the outdoor condenser 17, the temperature sensor 9 detects the temperature of the hot water stored in the heat storage tank 5 and transmits a signal to the controller 10, as shown in FIG. The controller 10 opens the solenoid valve ^15 and at the same time opens the solenoid valve 81 so that the refrigerant discharged from the compressor 1 is sent to the outdoor condenser 17.
6, the water circulation pump 6 is stopped to stop the water circulation circuit, and the outdoor fan 18 is ordered to start operation so that the outdoor condenser 17 can efficiently radiate heat from the refrigerant. . For this reason, the refrigerant circulation circuit is changed and the refrigerant is condensed in the outdoor condenser 17. That is, the high-temperature, high-pressure refrigerant compressed by the compressor 1 does not directly flow into the refrigerant-to-water heat exchanger 2 because the solenoid valve B16 is closed, but flows through the open solenoid valve A15 to the outdoor condenser. This brings us to 17. Here, the refrigerant radiates heat to the outside air while being blown by the outdoor fan 18, and is condensed and liquefied. After that, the refrigerant is sent to the refrigerant-to-water heat exchanger 2, but the refrigerant has already condensed and liquefied and does not radiate heat to the hot water, which is in a heat transfer relationship. Furthermore, since the water circulation pump 6 is also stopped, no heat is absorbed from the hot water stored in the heat storage tank 5. This is because, as shown in FIG. 4, in the refrigerant-to-water heat exchanger 2 of this embodiment, the refrigerant side pipes 11 and the water side pipes 12, which are each flattened, are alternately in contact with each other to maintain a heat transfer relationship. The center bolt 14 fastens the two fixing plates 13. Therefore, when the water circulation pump 6 is stopped, there is no heat transfer from the hot water stored in the heat storage tank 5 to the refrigerant. The low-temperature, high-pressure refrigerant that exits the refrigerant-to-water heat exchanger 2 is sent to the indoor evaporator 4 via the expansion valve 3 and stored in the heat storage tank 5 in the same manner as when
The refrigerant is evaporated while lowering the indoor temperature and is sucked into the compressor 1 again, and this refrigerant cycle cools the indoor room.

The conventional heat pump water heater increases the temperature of hot water in the heat storage tank 5 to a set temperature by repeating a cycle of storing heat in the heat storage tank 5 and a cycle of releasing heat in the outdoor condenser 17. At the same time, it cools the room.

Problems to be Solved by the Invention However, in the above configuration, when the temperature of hot water in the heat storage tank 5 rises to a set temperature, it is necessary to dissipate heat in the outdoor condenser 17. It is necessary to provide an outdoor unit made up of several types of parts, including the following, and a significant increase in costs is expected, including the cost of materials for the parts and the costs of members for constructing the outdoor unit.

Furthermore, when installing the product, a space is required for installing the outdoor unit, and the connection of refrigerant piping and wiring of electricity and signals become complicated, which is not preferable. On the other hand, regarding the control of the system, the temperature sensor 9 detects the temperature and the controller 10
The signal transmitted to the solenoid valve A15, the solenoid valve 816, the outdoor fan 18, and the water circulation pump 6 must all be transmitted as a command, and if all parts do not operate normally, the heat dissipation in the outdoor condenser 17 Cycles do not operate blindly. For this reason, the number of parts that operate according to commands is small,
It is thought that the simpler the control, the less likely the product will be defective.

Therefore, in the configuration shown in the conventional example, while increasing the temperature of hot water in the heat storage tank 5 to a set temperature,
In order to cool the room, there are the following problems.

(1) The number of parts is large and the system configuration is complicated.

(2) The cost of parts and members is high.

(3) It takes a lot of man-hours to install the product, and a large space is required for installation.

(The control of the four systems is complicated.

The present invention solves these conventional problems, and is a simplified system that can be installed in a narrow space because it is composed of a small number of parts. To provide a heat pump water heater that significantly reduces costs.

Means for Solving the Problems In order to solve the above problems, the heat pump water heater of the present invention stops the water circulation pump when the temperature of the hot water in the heat storage tank rises to a set temperature, and It is equipped with a controller that commands the fan to operate.

Effect of the Invention With the above-described configuration, the present invention eliminates the need to radiate heat from the outdoor condenser when the temperature of hot water in the heat storage tank rises to a set temperature, and does not require an outdoor unit for installing an outdoor condenser or an outdoor fan. Heat can be radiated from the refrigerant-to-water heat exchanger even without it. In other words, when the temperature of the hot water in the heat storage tank rises and it becomes necessary to heat the hot water in the refrigerant-to-water heat exchanger, the water circulation pump is stopped and the condenser fan is operated. It becomes possible to radiate heat from the refrigerant-to-water heat exchanger to the outside air.This eliminates the need to form a separate refrigerant circuit during heat radiation operation, resulting in smaller product space, system simplification, and significant cost savings. This makes it possible to reliably store heat, supply hot water, and cool the room while reducing energy consumption.

Embodiment A first embodiment of the present invention will be described below with reference to the accompanying drawings.

Note that the same parts as those in the conventional example shown in FIGS. 3 and 4 are given the same reference numerals, and the explanation thereof will be omitted.

In addition, the refrigerant circulation system path during the heat storage/hot water supply operation and the heat radiation operation in this embodiment is the same and is indicated by the solid arrow in Fig. 1, but the thread path in the conventional example is the heat storage/hot water supply operation and the heat dissipation operation. The solid line (A) indicates the hot water supply operation, and the broken line (B) indicates the heat dissipation operation.

In FIG. 1, 20 is a condenser fan that blows air to the refrigerant-to-water heat exchanger 2, and 6 is a water circulation pump that sends water to the refrigerant-to-water heat exchanger 2. These are controlled by a signal from a temperature sensor 9 that detects the temperature of hot water inside the heat storage tank 5.

When the temperature sensor 9 detects that the temperature of hot water has risen to the set temperature, the controller 10 switches to heat dissipation operation.
When the signal is transmitted to , the water circulation pump 6 that was operating during the heat storage/hot water supply operation is stopped, and the condenser fan 20 is operated. In this way, the hot water heated from the refrigerant-to-water heat exchanger 2 whose water supply has been forcibly stopped does not return to the heat storage tank 5. Furthermore, the check valve 24 provided in the water circulation circuit prevents the heated hot water in the heat storage tank 5 from flowing backward.

Here, the explanation will be continued based on FIG. 2, which shows the refrigerant-to-water heat exchanger 2 and the condenser fan 20 of this embodiment.

The high temperature and high pressure refrigerant discharged from the compressor 1 flows into the refrigerant side pipe 21 of the refrigerant-to-water heat exchanger 2 shown in FIG. During the heat storage/hot water supply operation, the hot water flowing through the water side pipe 22, which was in a heat transfer relationship, was heated, but during the heat dissipation operation,
Hot water cannot be circulated. On the other hand, since the condenser fan 20 is operated, it comes into contact with the refrigerant side pipe 21 (in this example, it is brought into mechanical contact, but it is easily possible that the same effect can be obtained by connecting it with brazing, etc.) So,
I will not specifically discuss it here. ) is blown to the heat dissipation fins 23. The air is configured to pass through a passage (hole-shaped) arbitrarily provided in the heat radiation fins 23 and remove heat from the refrigerant side pipe 21 of the refrigerant-to-water heat exchanger 2. That is, the heat dissipation fins 23, which are firmly connected to the refrigerant side pipe 21 through which a high temperature and high pressure refrigerant flows, are in a heat transfer relationship with the refrigerant, and the temperature gradually increases. However, when the condenser fan 20 operates and starts blowing air, heat is taken away from the heat radiation fins 23 (partly directly from the refrigerant side pipe 21). At this time, as mentioned earlier, hot water is not being circulated, so no heat storage or hot water supply is performed, and as a result, heat is radiated from the refrigerant-to-water heat exchanger 2 while cooling the room.

In FIG. 2, the components of the refrigerant-to-water heat exchanger 2 and the condenser fan 20 of this embodiment will be explained in more detail.

25 is a motor for driving the condensing fan 20;
It is fixed to the refrigerant-to-water heat exchanger 2.

Further, 26 is a heat insulating material for insulating the refrigerant-to-water heat exchanger 2, which prevents heat release to the outside air especially during heat storage/hot water supply operation, and performs highly efficient heat exchange. Reference numeral 27 designates fixing plates for fixing the refrigerant side pipe 21 and the water side pipe 22 by tightening the center bolt 28, and these plates are provided on the upper and lower sides. This fixing plate 27 not only maintains the strength of the refrigerant-to-water heat exchanger 2 by mechanically fixing the refrigerant side pipe 21 and the water side pipe 22, but also maintains the tightness between the refrigerant side pipe 21 and the water side pipe 22. It improves the temperature and promotes the heat transfer effect. Furthermore, in this embodiment, the heat dissipation fins 23 formed in an inverted vessel shape are also held by fastening the fixing plate 27, thereby improving the degree of contact with the refrigerant side pipe 21.

29 is a damper installed at the bottom of the refrigerant-to-water heat exchanger 2. It is closed during heat storage and hot water supply operation to prevent heat release to the outside air during heat exchange, and is open during heat dissipation operation and is used as a condenser fan. This helps the passage of air from 20 and provides a more efficient heat dissipation effect. However, the main damper 29 is controlled by a signal from the controller 10 to open at the same time as the condenser fan 20 operates.

In this embodiment, a damper 2 is installed at the bottom of the refrigerant-to-water heat exchanger 2.
However, if the loss due to heat radiation during heat storage and hot water supply operation is small and the fixing plate 27 is provided with holes for ventilation, the damper 29 is not necessary, but it can be easily considered. It's not specifically mentioned.

Furthermore, in this embodiment, the indoor evaporator 4 is used to store heat, supply hot water, and radiate heat while cooling the room. However, in the winter when the indoor temperature is sufficiently low, a configuration in which heat is absorbed from the outside air using a duct etc. can be used to reduce the indoor temperature. It becomes possible to drive without lowering the vehicle.

Effects of the Invention As described above, the heat pump water heater of the present invention provides the following effects.

(1) The temperature of the hot water supply in the heat storage tank rises to the set temperature,
When indoor cooling continues, the water circulation pump stops and the condenser fan operates, blowing air to the refrigerant-to-water heat exchanger and achieving sufficient heat dissipation. It does not include an outdoor unit for heat dissipation operation such as a solenoid valve, which has the effect of reducing the space required for the product and significantly reducing the cost of parts and materials.

(2) Since the above-mentioned outdoor unit is not included, the refrigerant circulation circuit is simplified, making it easier to connect refrigerant piping during product assembly and installation, as well as simplifying electrical and signal wiring, which reduces the possibility of system malfunctions. This has the effect of reducing the factors.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a heat pump water heater according to a first embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a refrigerant-to-water heat exchanger, which is an elemental component of the first embodiment of the present invention. FIG. 3 is a system configuration diagram of a conventional heat pump hot water supply device, and FIG. 4 is a sectional view of essential parts of a refrigerant-to-water heat exchanger of the conventional example. 1... Compressor, 2... Refrigerant-to-water heat exchanger, 3... Expansion valve, 4... Indoor evaporator, 5... ... Heat storage tank, 6 ... Water circulation pump, 7 ... Indoor fan (evaporator fan), 9.
...Temperature sensor, 10...Controller, 2
0... Condenser fan, 24... Check valve. Name of agent: Patent attorney Toshio Nakao and 1 other person
2 Figure 3 Figure 4/4 Procedural Amendment May 1988 No. 2B

Claims (2)

[Claims] (1) A refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, an expansion valve, an indoor evaporator, and the compressor are connected in order in a ring, a heat storage tank, a water circulation pump, the refrigerant-to-water heat exchanger, and a check check. A water circulation circuit in which the valves are connected in an annular manner in this order, an evaporator fan that blows air to the indoor evaporator, a condenser fan that blows air to the refrigerant-to-water heat exchanger, and a signal from a temperature sensor that detects a signal from the water circulation pump. A heat pump water heater comprising: a controller that commands to operate the condenser fan after the condenser fan is stopped. (2) The heat pump water heater according to claim 1, wherein the refrigerant-to-water heat exchanger is provided with heat radiation fins on its refrigerant side pipe.