JP2004308956A - Air conditioning system with hot-water supply function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use the heat of an air conditioner discharged outdoors before for a heat exchanger in a hot-water supply tank. <P>SOLUTION: In this air conditioner with hot-water supply function, a refrigerant circuit is formed by connecting, in order, a compressor, a condenser, an expansion means, namely a capillary tube or an electromagnetic expansion valve, and an evaporator through refrigerant tubes. The evaporator and an indoor blower are disposed indoors, and the compressor, the condenser, the expansion valve, an outdoor blower, and the hot-water supply tank outdoors. The refrigerant tube between the compressor and the condenser heat hot water in the hot-water supply tank. The hot-water supply tank comprises a first tank with low temperature water and a second tank with high temperature water, and the hot water is delivered from the second tank. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an air conditioning system having a hot water supply function for converting water into hot water and discharging hot water by utilizing the operation of an air conditioner, and a hot water conversion method.
[0002]
[Prior art]
Conventionally, in this type of hot water supply system, a system in which an electric heater is provided inside a hot water tank to supply hot water is known, and is completely different from an air conditioning system (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-5-5558
[Problems to be solved by the invention]
However, such a conventional hot water supply system is generally inefficient because an electric heater is used. For air conditioners, for example, in regions belonging to Southeast Asia and the tropics, air conditioning is used throughout the year, so the heat energy emitted from outdoor units is extremely large, and when considering energy use efficiency and global warming, , Has become a large energy loss.
[0005]
The present invention provides an air conditioning system having a hot water supply function that enables hot water to be supplied with high efficiency without using a heater by utilizing heat radiated from an air conditioner to produce hot water. In addition, the present invention provides a system that can use an air-conditioning apparatus and more efficiently discharge hot water when hot water is required.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an air conditioning system having a hot water supply function of the present invention, in which a compressor, a condenser, an expansion means, that is, a capillary tube or an electromagnetic expansion valve, and an evaporator are sequentially connected by refrigerant piping. Air having a hot water supply function comprising a refrigerant circuit, wherein the evaporator and the indoor blower are disposed on the indoor side, and the compressor, the condenser, the expansion valve, the outdoor blower and the hot water supply tank are disposed on the outdoor side. In a conditioner, a refrigerant pipe between the compressor and the condenser heats hot water in the hot water supply tank.
[0007]
In the hot water supply tank, a first tank having a relatively low water temperature and a second tank having a relatively high water temperature are provided. In the second tank having a high water temperature, the high-temperature refrigerant gas that has just exited the compressor is heated. Used as an exchange medium, the refrigerant gas then exchanges heat with the water in the first tank having a lower water temperature. As a result, hot water can be produced with high energy conversion efficiency. This technique is often used as a heat exchange method between air and a refrigerant in an air-cooled heat exchanger. Further, by increasing the heat absorption obtained by using the indoor fan and the heat exchanger of the air conditioner temporarily and when necessary, it is possible to physically increase the amount of heat radiation of the air conditioner, and quickly Can be made.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment)
FIG. 1 shows a sketch of an air conditioning system having a hot water supply function according to an embodiment of the present invention. In FIG. 1, an indoor air conditioner 1 that generates cooling air is mounted on a wall surface in a room. The heat absorbed by the indoor unit is conventionally radiated by the outdoor air conditioner 2 installed outdoors. The indoor unit and the outdoor unit are connected by an internal / external connection pipe. The water supply tank 3 is installed at least above the ceiling of the bathtub 5 or other bathtubs, and is connected to the shower 4 in the bathroom and the outdoor air conditioner 2.
[0009]
FIG. 2 is a detailed refrigeration cycle diagram and water piping diagram in the air conditioning system having the hot water supply function of the present invention. When the user presses the operation ON switch on the remote controller 1-d on the indoor side, the operation of the air conditioner is started by the air conditioner operation determining means, and the indoor heat exchanger 1-a, the indoor fan operating means 1-b, and the outdoor air conditioner are operated. By making full use of the machine 2, the cooling air is generated in the room, and at the same time, the refrigerant absorbs heat from the room. Next, this refrigerant is carried to the compressor 2-a of the outdoor air conditioner, and becomes a high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant is carried to the hot water supply tank 3 by the high-temperature refrigerant pipe 2-e, and enters the internal second heat exchanger 3-h. Then, it passes through the internal heat exchanger connection pipe 3-f and enters the first heat exchanger 3-g. After that, the refrigerant is conveyed to the outdoor heat exchanger 2-C inside the outdoor air conditioner 2 through the medium temperature refrigerant pipe 2-f, and the condensation of the refrigerant is completed by making full use of the outdoor fan operating means 2-d. Thereafter, the adiabatic expansion is performed by the expansion means 2-b, and the air is transferred to the indoor air conditioner. As described above, a cycle of the flow of the refrigerant is formed.
[0010]
On the other hand, as shown in FIG. 2, the flow of water passes through the water supply pipe, enters the first tank 3-a inside the water supply tank 3 from the water inlet pipe 3-d, passes through the tank connection portion 3-i, and passes through the second tank. 3-b, it is carried from the hot-water tapping pipe 3-c to the shower 4 in the bathtub. As described above, a water flow cycle is formed.
[0011]
In this way, the waste heat of the refrigerant which has been discharged outside by the conventional outdoor air conditioner 2 is transferred to the hot water supply tank 2, and heat is exchanged between the waste heat of the refrigerant and the stored water. The refrigerant is returned to the outdoor air conditioner 2 to form a refrigeration cycle of the air conditioner.
[0012]
FIG. 3 is a detailed internal view of the water supply tank 3, showing the structure. The high-temperature refrigerant coming from the air conditioner compressor first enters the second heat exchanger 3-h inside the second tank 3-b, where it is first heat-exchanged with relatively hot water. Next, the heat enters the first heat exchanger 3-g inside the first tank 3-a via the heat exchanger connection pipe 3-f, where the heat is exchanged with relatively low-temperature hot water. Thereafter, the refrigerant is returned to the outdoor heat exchanger 2-C of the outdoor air conditioner 2.
[0013]
FIG. 4 shows the main temperature points of the refrigerant and water in the hot water supply tank. Point A is the relatively low temperature of the water entering through the water inlet pipe 3-d, and point B is the hot water outlet pipe 3-. The relatively high-temperature water (hot water) temperature C point before entering c is the relatively high-temperature refrigerant temperature at which the refrigerant exiting the compressor enters through the high-temperature refrigerant pipe 2-e, and the D point enters the medium-temperature refrigerant pipe. Shows the previous relatively cool refrigerant temperature.
[0014]
6 shows the counter-flow heat exchanger system of FIG. As shown in the figure, in the first tank 3-a, relatively low-temperature refrigerant D and water A are heat-exchanged via the first heat exchanger 3-g. In the second tank 3-b, a counterflow heat exchanger system that realizes heat exchange with a constant temperature difference by exchanging heat between the relatively high-temperature refrigerant C and water B via the second heat exchanger 3-h. Form.
[0015]
FIG. 6 is a block diagram showing a control circuit-related structure of an air conditioning system having a hot water supply function according to the embodiment of the present invention. The respective control circuits of the indoor air conditioner 1, the air conditioner operation determining means 1-c, the indoor fan operating means 1-b, and the first tank water temperature detecting means 3-e will be described with reference to FIG.
[0016]
Specifically, a decrease in the water temperature in the hot water supply tank 3 caused by the user using hot water during the operation of the air conditioner is detected by the first tank water temperature detection means 3-e, and the water temperature Tw is set to a certain set water temperature. If the temperature is lower than Ts, the indoor fan control unit and the indoor fan rotation speed changing unit in the air conditioner operation determination unit are fully used to raise the indoor fan by a fixed rotation speed + α. If Tw> = Ts, do not change the setting.
[0017]
With this control, if it is necessary to temporarily increase the water temperature in the hot water supply tank temporarily, it is possible to increase the amount of heat absorbed in the room and increase the heat radiation outside the room by increasing the indoor fan speed. . This makes it possible to automatically raise the water temperature inside the water supply tank.
[0018]
With the above configuration, the operation is performed according to the water temperature inside the water supply tank, and therefore, even if the water temperature drops, automatic control that enables the temperature to return to the high temperature as soon as possible is realized.
[0019]
FIG. 7 is a block diagram showing a control circuit-related structure of an air conditioning system having a hot water supply function according to the embodiment of the present invention. The respective control circuits of the remote controller 1-d, the indoor air conditioner 1, the air conditioner operation determining means 1-c, the indoor fan operating means 1-b, and the first tank water temperature detecting means 3-e will be described using FIG. .
[0020]
Specifically, when the user turns on the operation switch of the remote controller 1-b of the air conditioner, when the air conditioner operation determination means receives the air conditioner operation signal, the operation is simultaneously detected by the first tank water temperature detection means 3-e. If the water temperature Tw is lower than a certain set water temperature Ts, the indoor fan is increased by a certain number of revolutions + α by making full use of the indoor fan control means in the air conditioner operation determination means and changing the indoor fan speed. If Tw> = Ts, do not change the setting.
[0021]
With this control, if it is necessary to quickly raise the water temperature in the hot water supply tank when the air conditioner starts up, it is possible to increase the amount of heat absorbed inside the room and increase the heat radiation outside the room by increasing the indoor fan speed. Become. This makes it possible to automatically raise the water temperature inside the water supply tank.
[0022]
With the above configuration, the operation is performed according to the water temperature inside the water supply tank, so that the water temperature is always kept at a high temperature, and automatic control is realized that enables the temperature to be returned to the high temperature as soon as possible even if the water temperature drops.
[0023]
【The invention's effect】
ADVANTAGE OF THE INVENTION This invention can make the waste heat of an air conditioner heat-exchange with water with high efficiency, and can reduce energy. It is also possible to automatically raise the water temperature inside the hot water supply tank rapidly.
[Brief description of the drawings]
Fig. 1 Schematic diagram of an air conditioning system with a hot water supply function. Fig. 2 Refrigeration cycle diagram and water piping diagram in the air conditioning system. Fig. 3 Detailed view of the inside of a hot water tank. Fig. 4 Inside of a hot water tank and main temperature points. Fig. 5: Counterflow heat exchange system diagram Fig. 6: Block diagram showing control circuit related structure in the air conditioning system [Fig. 7] Block diagram showing control circuit related structure in the air conditioning system [Explanation of reference numerals]
1 indoor air conditioner 1-a indoor heat exchanger 2 outdoor air conditioner 2-a compressor 2-c outdoor heat exchanger 2-e high temperature refrigerant pipe 2-f medium temperature refrigerant pipe 3 hot water supply tank 3-a first tank 3- b Second tank 3-g First heat exchanger 3-h Second heat exchanger

Claims (3)

A compressor, a condenser, an expansion means, that is, a capillary tube or an electromagnetic expansion valve, and an evaporator are sequentially connected by a refrigerant pipe to constitute a refrigerant circuit, and the evaporator and the indoor blower are disposed indoors, and the outdoor air blower is provided. An air conditioner having a hot water supply function in which a compressor, the condenser, the expansion valve, an outdoor blower and a hot water supply tank are disposed, and a refrigerant pipe between the compressor and the condenser is provided in the hot water supply tank. An air conditioning system having a hot water supply function for heating hot water, wherein the hot water supply tank includes a first tank having a low water temperature and a second tank having a high water temperature, and the hot water is discharged from the second tank. The air conditioning system with a hot water supply function according to claim 1, wherein a first heat exchanger is provided inside the first tank, and a second heat exchanger is provided inside the second tank. The refrigerant circuit in the hot water supply tank enters from the second tank and exits from the first tank, and the water circuit in the hot water supply tank enters from the first tank and exits from the second tank. The air conditioning system provided with a hot water supply function according to claim 1, characterized in that:

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