JPH0217785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water supply and storage system using a heat pump.

There have been various types of hot water storage tank type water heaters, whether they are heat pump type or electric heater type, but most of them are designed to store hot water in bulk to account for the total amount of hot water used by a household in one day. ,
A hot water storage tank with a capacity of about 350 to 450 is required. By the way, for an electric water heater, if the capacity is around 370, the external dimensions of the hot water tank are 680 mm x
If the capacity is about 680mm x 1900mm, the external dimensions of the hot water storage tank are about 740mm x 740mm x 1760mm.

For hot water storage tanks of this size, usually 1/4
Because it requires an area of 10,000 sq ft or more,
For example, if it is placed inside a building, the effective floor space will be sacrificed, and if it is placed outside, for example, on a balcony, nothing else can be placed on it. In particular, in condominiums and the like, the area occupied by the hot water storage tank occupies a large proportion of the total effective area, making it difficult for it to become widely used.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water supply and storage system that is inexpensive and space-saving.

Therefore, in the present invention, a heat pump device is provided with a hot water storage tank that stores a predetermined amount of water, and a heat pump device in which a condensing heat exchanger is arranged at the inner bottom, an auxiliary heater arranged approximately in the center, and an auxiliary heater. A water supply device that is opened at a lower level and supplies water to the area concerned is provided, and an insulated bathtub is provided that stores the hot water supplied from the tank while being insulated from the outside, and is placed on the inner wall of the bathtub and is placed in contact with the internal hot water. a hot water circulation circuit that is opened above the auxiliary heater of the tank and circulates hot water from the area to the radiator, and a hot water supply circuit that branches off from the middle of the circuit and supplies hot water to the bathtub. , hot water heated in the tank is supplied by a hot water supply circuit and a predetermined amount of hot water is stored in the bathtub;
Hot water is stored in the tank as a primary temperature area below the auxiliary heater and as a secondary temperature area above the primary temperature area, and hot water in the secondary temperature area is circulated to the radiator through a hot water circulation circuit to cool the bathtub. The objective is to achieve the above object by configuring a hot water supply and storage system that is capable of additionally heating water and supplying additional hot water with a hot water supply circuit.

In short, by filling the bathtub with hot water that has been boiled in a hot water storage tank several times in advance and using this bathtub as a heat storage tank, the hot water storage tank can be made smaller, making it cheaper and requiring less installation space. In addition to saving space, the hot water circulation circuit and radiator can provide additional heating (reheating), and the hot water supply circuit can provide additional hot water (filling), increasing convenience of use. The purpose is to improve thermal efficiency by forming primary and secondary temperature stratification regions by heating the device and the auxiliary heating device.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a perspective view of the hot water supply and storage system of this embodiment, and FIG. 2 shows its circuit diagram.
In these figures, a hot water storage tank 1 which has been subjected to heat insulation treatment has a condensing heat exchanger 22 of a heat pump device 2 at its inner bottom and an auxiliary heater 3 approximately at the center.
A water supply device 4 and a hot water circulation circuit 5 for circulating hot water in the hot water storage tank 1 are provided above the auxiliary heater 3, respectively.

In the heat pump device 2, a refrigerant compressed by a compressor 21 using a motor 20 as a driving source is supplied to the heat exchanger 22, the electromagnetic valve 23, and the expansion valve 2.
4, the cycle returns to the compressor 21 via the outdoor heat exchanger 25 and the solenoid valve 26. The electromagnetic valve 23 and the expansion valve 2
A solenoid valve 27 is connected in parallel to the series circuit of No. 4, and a series circuit of a solenoid valve 28, an expansion valve 29, and an indoor heat exchanger 30 is connected in parallel to the solenoid valve 26. .

The auxiliary heater 3 is constituted by, for example, a sheathed heater (approximately 1 kilowatt). Further, the water supply device 4 detects the liquid level in the hot water storage tank 1 using a float 41, and supplies water from the city water pipe 42 to the water supply pipe 43 into the hot water storage tank 1 based on the displacement of the float 41. It is constituted by a float valve 44. Here, the lower end of the water supply pipe 43 faces the inner bottom of the hot water storage tank 1.

In the hot water circulation circuit 5, the hot water above the auxiliary heater 3 in the hot water storage tank 1 is stored by a circulation pump 51 through a switching valve 52 and a heating coil 53 as a radiator built in an insulated bathtub 61. It is designed to be circulated above the auxiliary heater 3 of the tank 1. The bathtub 61 is composed of a bathtub body 62 whose outer surface is subjected to heat insulation treatment, and a lid 63 made of a heat insulating material. A reflective mirror 64 such as a mirror or aluminum foil is installed on the surface of the lid 63 facing the hot water surface.
is pasted. As a result, the bathtub 61
maintains the heat retention effect of a thermos flask. Further, the switching valve 52 is connected to a temperature sensor 7 that detects a water temperature higher than the auxiliary heater 3 of the hot water storage tank 1.
The switching operation is performed by a signal from 0 or manually, and the hot water circulating in the hot water circulation circuit 5 is switched to the hot water output circuit 71. In addition to a faucet 73 that supplies hot water into the bathtub 61 via a mixing valve 72 that selectively mixes hot water branched from the hot water circulation circuit 5 with city water 75, the hot water supply circuit 71 includes, for example, a shower 74 and the like. Each is provided.

Next, the operation of this embodiment will be explained. Now, when the heat pump device 2 is operated, the compressor 21
The refrigerant compressed and pressurized by 23 and expansion valve 24, it absorbs heat from the outside in the outdoor heat exchanger 25, vaporizes and expands, and returns to the compressor 21 again via the electromagnetic valve 26.

As a result, when the upper water in the hot water storage tank 1 is heated and reaches a predetermined primary temperature, for example, 45°C, this is detected by the temperature sensor 70, and the switching valve 52
is switched to the hot water tapping circuit 71 side, and the circulation pump 51 is activated. Then, hot water storage tank 1
The upper hot water is discharged into the bathtub 61 from a faucet 73 via a switching valve 52 and a mixing valve 72 by a circulation pump 51 . As a result, a predetermined amount of hot water in the hot water storage tank 1 is discharged into the bathtub 61, and when the liquid level in the hot water storage tank 1 decreases, the float valve 44 is activated and low-temperature city water flows into the inner bottom of the hot water storage tank 1. being sent. Eventually, a predetermined amount of the upper hot water in the hot water storage tank 1 is discharged into the bathtub 61, and when the temperature sensor 70 detects low-temperature city water, the circulation pump 51 is stopped by a signal from the temperature sensor 70. In addition, the temperature of the low-temperature city water is raised again by the heat exchanger 22.

When this is repeated a predetermined number of times, for example twice, until the hot water in the bathtub 61 reaches a predetermined amount, in the third time, when the hot water temperature in the hot water storage tank 1 reaches 45°C again,
After the operation of the heat pump device 2 is stopped, the auxiliary heater 3 further raises the temperature of higher-grade hot water to about 75° C. to 80° C. as a secondary temperature, and prepares it for reheating.

Therefore, if it is necessary to reheat the bathtub when taking a bath, the circulation pump 51 is driven, the switching valve 52 is switched to the hot water circulation circuit 5 side, and the high temperature water in the hot water storage tank 1 is circulated to the heating coil 53. The temperature of the hot water in 61 is raised. On the other hand, in the case of pouring hot water, if the switching valve 52 is switched to the hot water supply circuit 71 side, high-temperature water can be discharged into the bathtub 61 through the faucet 73 of the hot water supply circuit 71. can be done.

Note that when the heat pump device 2 is operated to store hot water while cooling the room, the refrigerant compressed and pressurized by the compressor 21 is transferred to the heat exchanger 22, the solenoid valve 27, the outdoor heat exchanger 25, the solenoid valve 28, What is necessary is to return it to the compressor 21 through the expansion valve 29 and the indoor heat exchanger 30. At this time, the fan 25A of the outdoor heat exchanger 25 may be stopped.

Therefore, according to this embodiment, the hot water boiled in the hot water storage tank 1 is sequentially supplied to the bathtub 61, and after this process is repeated several times and the hot water in the bathtub 61 reaches a predetermined amount, the upper level of the hot water in the hot water storage tank 1 is supplied. The hot water is then used for other hot water supply or shower purposes and is further heated to, for example, 75 to 80 degrees Celsius, and the heat is stored. , since hot water was stored in the bathtub 61 in advance,
The utilization efficiency of the bathtub 61 can be improved, and the capacity of the hot water storage tank 1 can be reduced. Incidentally, in this embodiment, the hot water storage tank 1 can have a capacity of about 1/3 that of a conventional tank, that is, about 100 to 130. As a result, it is inexpensive and space-saving, and it is extremely advantageous, especially in apartments and the like, since more effective space can be secured than before. Moreover, the ability to reduce the capacity of the hot water storage tank 1 has the advantage that the hot water storage tank 1 can be made into a wall-mounted type, for example, so that no installation floor space is required.

In addition, the hot water in the hot water storage tank 1 is maintained at around 75°C to 80°C above the auxiliary heater 3, and at around 45°C below the auxiliary heater 3, and the high-temperature water above the auxiliary heater 3 is kept at around 45°C. Since it is configured so that it is circulated for reheating, it is possible to provide sufficient reheating heat, and the circulating hot water that is used for reheating and returned is still at a temperature sufficient for hot water supply for showers, etc.
For example, since the temperature is maintained at a temperature level of 60℃ to 70℃, hot water can be poured as is without the need for reheating.

Furthermore, since it uses a heat pump, it can be operated during daytime hours when temperature conditions are favorable.
If the outdoor heat exchanger 25 is installed facing south, the refrigerant will evaporate sufficiently even if the fan 25A is stopped while the sun is out, allowing energy-saving operation.

In the above embodiment, the temperature sensor 7 measures the amount of hot water dispensed from the hot water storage tank 1 to the bathtub 61 for one time.
For example, if a flow meter is provided in the middle of the hot water supply circuit 71, and this flow meter detects that a predetermined amount of hot water has been dispensed, then one batch of hot water is stopped. You may also do so.

Further, in the above embodiment, the amount of hot water dispensed from the hot water storage tank 1 to the bathtub 61 was defined based on the number of times hot water is dispensed from the hot water storage tank 1 to the bathtub 61.
When this liquid level gauge detects that the amount of hot water in the bathtub 61 has reached a predetermined amount, the hot water supply is stopped, the operation of the heat pump device 2 is stopped, and the auxiliary heater 3 is energized. It's okay.

As described above, according to the present invention, it is possible to provide a hot water supply and storage system that is inexpensive and space-saving.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is its circuit diagram. 1...Hot water storage tank, 2...Heat pump device,
3...Auxiliary heater, 4...Water supply device, 5...Hot water circulation circuit, 22...Condensing heat exchanger, 53...Heating coil serving as a radiator, 61...Insulating bathtub, 71
...Hot water circuit.

Claims (1)

[Scope of Claims] 1. A heat pump device having a hot water storage tank for storing a predetermined amount of water, a condensing heat exchanger disposed at the inner bottom of the tank, and an auxiliary heat pump disposed approximately at the center of the tank. It comprises a heater, a water supply device that is opened below the auxiliary heater of the tank and supplies water to the area, and an insulated bathtub that stores the hot water supplied from the tank while being insulated from the outside. , a radiator disposed on the inner wall of the bathtub and in contact with the internal hot water; a hot water circulation circuit that is opened above the auxiliary heater of the tank and circulates the hot water in the area to the radiator; a hot water supply circuit branched from the middle of the circuit to supply hot water to the bathtub; hot water heated in the tank is supplied by the hot water supply circuit and a predetermined amount of hot water is stored in the bathtub;
Hot water is stored in the tank as a primary temperature area below the auxiliary heater and as a secondary temperature area above the primary temperature area, and hot water in the secondary temperature area is circulated to the radiator through a hot water circulation circuit to cool the bathtub. A hot water storage system characterized by being able to perform additional heating and additional hot water supply through a hot water supply circuit. 2. The hot water storage system according to claim 1, wherein the capacity of the hot water storage tank is approximately 1/3 of the average amount of hot water used per day. 3. In claim 1 or 2, the primary temperature range is controlled by a heat pump device,
A hot water supply and storage system characterized in that each of the secondary temperature ranges is obtained by an auxiliary heater.