CN106152332A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN106152332A CN106152332A CN201510161541.7A CN201510161541A CN106152332A CN 106152332 A CN106152332 A CN 106152332A CN 201510161541 A CN201510161541 A CN 201510161541A CN 106152332 A CN106152332 A CN 106152332A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 180
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003507 refrigerant Substances 0.000 claims abstract description 355
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 321
- 238000010438 heat treatment Methods 0.000 claims abstract description 143
- 238000007791 dehumidification Methods 0.000 claims description 72
- 230000003750 conditioning effect Effects 0.000 claims description 33
- 238000010257 thawing Methods 0.000 claims description 18
- 239000008236 heating water Substances 0.000 claims description 16
- 238000005485 electric heating Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 238000004781 supercooling Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 3
- 102220024779 rs731506 Human genes 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 41
- 238000007664 blowing Methods 0.000 description 28
- 238000010586 diagram Methods 0.000 description 13
- 238000005265 energy consumption Methods 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- 102220507985 Gasdermin-E_K40A_mutation Human genes 0.000 description 3
- 102220596833 Non-structural maintenance of chromosomes element 1 homolog_K41A_mutation Human genes 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- Air Conditioning Control Device (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
A kind of air conditioning system and control method thereof, energy-conservationly to indoor offer fluid after fully dehumidifying is heated, and can have heat water supply functions.The air conditioning system of the present invention includes outdoor unit, dehumidifying heating indoor unit and the cold-producing medium hydrothermal exchange unit being connected via the first connecting pipings, the second connecting pipings and the 3rd connecting pipings, also include: cold-producing medium hydrothermal exchange unit, it includes refrigerant piping, water loop and cold-producing medium water heat exchanger, one end of refrigerant piping is connected with the first connecting pipings, and the other end and the 3rd connecting pipings connect；First switching device, it can switch between state and the state making the first connecting pipings connect with suction tube making discharge pipe and the connection of the first connecting pipings；And second switching device, it can switch between the state making the second connecting pipings connect with suction tube with the state making the second connecting pipings and the 3rd connecting pipings connect.
Description
Technical Field
The present invention relates to an air conditioning system and a control method thereof, and more particularly, to an air conditioning system including an outdoor unit and a dehumidifying and heating indoor unit and a control method thereof.
Background
With the improvement of living standard, the demand of people for living environment control is increasingly prominent, so that the function of the air conditioning system is gradually diversified from single temperature regulation. In humid and rainy areas and in rainy seasons, the humidity of air is high, which causes discomfort to human bodies, so that the air conditioning system with the humidity control function is suitable for transportation.
Air conditioning systems generally use the following principles for dehumidification: the air is condensed by passing it through a heat exchanger having a surface temperature below the dew point of the air, thereby removing moisture from the air. From the above dehumidification principle, it is known that the lower the surface temperature of the heat exchanger is, the better the dehumidification effect is. However, although the humidity can be reduced after low-temperature dehumidification, the air temperature is also reduced, and therefore, in an environment where both dehumidification effect and temperature are required, for example, a bathroom or the like, it is necessary to dehumidify the air and then reheat the air so as to maintain comfort in human body feeling.
In order to achieve heating and dehumidification, as shown in fig. 12, an electric heating unit 29X is generally added downstream of the dehumidification heat exchanger 21X in the air passage. However, the electric heating unit generally converts electric energy into heat energy by using an electric heating element (e.g., a heating wire), so that air absorbs heat when flowing through the electric heating unit to increase the outlet air temperature, thereby increasing energy consumption. In addition, the air current after the heat exchange of the electric heating element can cause the temperature distribution of the air current to be uneven due to uneven heating, and the comfort is reduced.
In order to achieve heating and dehumidification, it is also conceivable to adopt a configuration disclosed in patent document CN1590890A, in which, as shown in fig. 13, the dehumidification heat exchanger 21X1 and the heating heat exchanger 22X are connected in series in an indoor refrigerant circuit, the dehumidification heat exchanger 21X1 and the heating heat exchanger 22X are provided in succession in the air passage, and the expansion device 25X is provided in the pipe therebetween. However, when heating and dehumidification are performed by the above configuration, since the same portion of the refrigerant heat is first used for heating and then carried away by the air flow, and is then used for cooling, neither the dehumidification heat exchanger 21X1 nor the heating heat exchanger 22X can function sufficiently, that is, dehumidification is insufficient, and the heating amount is also insufficient.
In addition, it is sometimes desirable for an air conditioning system to have a hot water supply function.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide an air conditioning system having a hot water supply function capable of supplying fluid, which has been sufficiently dehumidified and heated, to a room in an energy-saving manner, and a control method thereof.
In order to achieve the above object, the present invention provides an air conditioning system including an outdoor unit and a dehumidifying and heating indoor unit connected to each other via a connection pipe, wherein a discharge side of a compressor is connected to one end of a discharge pipe, the other end of the discharge pipe is connectable to one end of a first connection pipe among the connection pipes, a suction side of the compressor is connected to one end of a suction pipe, one end of a second connection pipe among the connection pipes is connected to a middle of the suction pipe, an outdoor heat exchanger is provided in a middle of a portion of the first connection pipe located in the outdoor unit, a first indoor refrigerant conditioning device and a first heat exchanger are provided in the dehumidifying and heating indoor unit in this order from one end of the first indoor pipe, one end of the first indoor pipe is connected to a portion of the first connection pipe located outside the outdoor unit, the other end of the first indoor-side piping is connected to a portion of the second connection piping located outside the outdoor unit, and a heat cycle device for sending heat or cold of the dehumidifying and heating indoor unit into the room is further provided in the dehumidifying and heating indoor unit, wherein the connection piping further includes a third connection piping having one end connected to a midway of the discharge pipe, and in the dehumidifying and heating indoor unit, a second indoor-side refrigerant adjusting device and a second heat exchanger are sequentially provided midway of the second indoor-side piping from one end of the second indoor-side piping, one end of the second indoor-side piping is connected to the first indoor-side piping and located between the first indoor-side refrigerant adjusting device and one end of the first indoor-side piping, and the other end of the second indoor-side piping is connected to a portion of the third connection piping located outside the outdoor unit, the air conditioning system further includes a refrigerant water heat exchange unit including a refrigerant pipe, a water circuit including a water pipe, and a refrigerant water heat exchanger that exchanges heat between the refrigerant flowing through the refrigerant pipe and the water flowing through the water pipe, one end of the refrigerant pipe being connected to a portion of the first connection pipe located outside the outdoor unit, and the other end of the refrigerant pipe being connected to a portion of the third connection pipe located outside the outdoor unit, and the air conditioning system further includes: a first switching device that is switchable between a first switching state in which the discharge pipe communicates with the first connection pipe and a second switching state in which the first connection pipe communicates with the suction pipe; and a second switching device that is switchable between a first switching state and a second switching state, wherein in the first switching state of the second switching device, the second connection pipe is communicated with the suction pipe, and in the second switching state of the second switching device, the second connection pipe is communicated with the third connection pipe.
According to the air conditioning system of the present invention, the operation can be performed in the hot water supply dehumidification heating mode, the hot water supply only mode, and the hot water supply cooling mode.
Further, according to the air conditioning system of the present invention, when the hot-water supply dehumidification and heating mode is operated, the indoor air sent from the heat cycle device can be dehumidified by the first heat exchanger of the dehumidification-heating indoor unit, and the indoor air sent from the heat cycle device can be heated by the second heat exchanger of the dehumidification-heating indoor unit. Therefore, compared with the structure that the electric heating unit is additionally arranged at the downstream of the dehumidification heat exchanger in the wind path formed by the indoor air supply device, the energy consumption can be reduced, the temperature distribution of the air supplied to the indoor by the dehumidification heating indoor unit can be prevented from being uneven, and the comfort of indoor personnel is improved. In addition, compared with a structure in which the dehumidification heat exchanger and the heating heat exchanger connected in series in the indoor refrigerant circuit are sequentially disposed in the air passage formed by the indoor air blowing device, both the dehumidification heat exchanger and the heating heat exchanger can sufficiently function, thereby avoiding insufficient dehumidification and insufficient heating amount. In addition, because a part of waste heat exhausted into the atmosphere by the outdoor unit originally can be used for heating the heat exchanger to realize waste heat utilization, the energy consumption ratio can be improved, and energy conservation and environmental protection are realized.
In addition, according to the air conditioning system of the present invention, when the outdoor unit is frosted and the system efficiency is reduced, the constant temperature defrosting operation can be performed in the hot water supply dehumidification heating mode, that is, in the hot water supply dehumidification heating mode or the dehumidification-only heating mode, the heating heat exchanger performs a heating function, and even if the indoor air supply device continues to operate, cold air is not blown into the room, so that the constant temperature defrosting can be realized.
Further, according to the air conditioning system of the present invention, since the refrigerant water heat exchange unit includes the refrigerant pipe, the water circuit formed of the water pipe, and the refrigerant water heat exchanger for exchanging heat between the refrigerant flowing through the refrigerant pipe and the water flowing through the water pipe, the water flowing through the water pipe of the water circuit can be heated by the refrigerant supplied from the outdoor unit and flowing through the refrigerant pipe, and the hot water can be supplied by the water circuit.
In addition, according to the air conditioning system of the present invention, in the hot water supply and heating mode, since both the first heat exchanger and the second heat exchanger function as a condenser to heat the indoor air, the overall efficiency can be improved.
In the air conditioning system according to the present invention, it is preferable that the outdoor unit further includes a branch pipe having one end connected to the suction pipe, the third connection pipe includes a first portion connected to the discharge pipe and a second portion connected to the second indoor-side pipe and the refrigerant pipe, and the air conditioning system further includes a third switching device switchable between a first switching state in which the second portion of the third connection pipe communicates with the first portion of the third connection pipe and a second switching state in which the second portion of the third connection pipe communicates with the other end of the branch pipe.
With the above configuration, the operation can be performed in the hot water supply dehumidification heating mode, the hot water supply heating mode, the hot water only mode, the hot water supply cooling mode, the cooling only mode, and the cooling water supply cooling mode.
In addition, when the outdoor unit is frosted and the system efficiency is reduced, the normal defrosting operation can be performed only in the cooling mode. In this case, in order to avoid the decrease in the indoor temperature and the influence on the comfort of the indoor person, it is preferable to stop the operation of the heat cycle device, but the operation is not limited to this, and the heat cycle device may be operated at a low speed to supply a weak airflow into the room. Incidentally, the defrosting speed of the ordinary defrosting operation performed in the cooling-only mode is faster than that of the above-described constant temperature defrosting operation.
In the air conditioning system according to the present invention, it is preferable that the first indoor-side refrigerant conditioning device and the second indoor-side refrigerant conditioning device are electrically operated valves or electromagnetic valves.
With the above configuration, the state of the refrigerant flowing through the first indoor-side pipe and the second indoor-side pipe can be adjusted with a simple configuration.
In the air conditioning system according to the present invention, it is preferable that the heat cycle device is an indoor air blowing device, and the first heat exchanger and the second heat exchanger are provided in a flow path of an air flow formed by the indoor air blowing device.
In the air conditioning system according to the present invention, it is preferable that the first heat exchanger is provided on an upstream side or a downstream side of the second heat exchanger on the flow path, or the first heat exchanger and the second heat exchanger are provided side by side on the flow path.
In the air conditioning system of the present invention, it is preferable that the heat cycle device is a water cycle device, and the first heat exchanger and the second heat exchanger send heat or cold to the room through the circulating water flowing in the water cycle device.
When the structure is adopted, the required heat or cold can be conveniently sent into the room.
In the air conditioning system according to the present invention, it is preferable that a liquid storage device is provided in the middle of the suction pipe.
When the structure is adopted, the liquid storage device can be used for absorbing the liquid components in the refrigerant returning to the compressor, and the compressor is prevented from being damaged due to the fact that the liquid refrigerant is sucked.
In the air conditioning system of the present invention, it is preferable that the air conditioning system further includes a floor heating water circuit connected to the water circuit.
In the above configuration, the floor or the like can be heated by the refrigerant water heat exchange unit.
In the air conditioning system according to the present invention, it is preferable that the air conditioning system further includes a water tank, a domestic water pipe connected to a domestic water terminal is provided in the water tank, and the water pipe constituting the water circuit passes through the water tank.
In the above configuration, the floor or the like can be heated by the refrigerant water heat exchange unit, and hot water can be supplied to the domestic water terminal.
In the air conditioning system of the present invention, it is preferable that the water tank has an electric heating device.
In the above configuration, when the amount of heat supplied to the water in the water tank by the water flowing through the water pipe in the water circuit is insufficient, the water in the water tank can be heated by the electric heating device to supply the water at a desired temperature to the domestic water terminal.
In the air conditioning system according to the present invention, it is preferable that the air conditioning system further includes a fan coil circuit connected to the water circuit.
When the above structure is adopted, the heat or cold of the water in the water circuit can be provided to the fan coil circuit by heating or cooling the water flowing through the water circuit by the refrigerant water heat exchange unit, so that the fan coil circuit can be used for heating or cooling.
In the air conditioning system according to the present invention, it is preferable that the outdoor unit further includes a supercooling pipe, a refrigerant adjusting device, and a subcooler, one end of the supercooling pipe is connected to the first connection pipe at a position closer to the other end side of the first connection pipe than the outdoor heat exchanger, the other end of the supercooling pipe is connected to the suction pipe, the refrigerant adjusting device is provided in the middle of the supercooling pipe, and the subcooler exchanges heat between the refrigerant flowing through the first connection pipe and the refrigerant flowing through the refrigerant adjusting device in the supercooling pipe.
In the case of the above configuration, the refrigerant flowing through the first outdoor-side pipe can be cooled by the subcooler, and thereby the capacity of dehumidifying the fluid sent from the heat cycle device by the first heat exchanger of the dehumidification and heating indoor unit can be enhanced.
In the air conditioning system according to the present invention, it is preferable that the air conditioning system further includes at least one indoor unit including an indoor unit-side refrigerant pipe, one end of the indoor unit-side refrigerant pipe is connected to a portion of the first connection pipe located outside the outdoor unit, the other end of the indoor unit-side refrigerant pipe is connected to a portion of the second connection pipe located outside the outdoor unit, and an indoor unit-side refrigerant conditioning device and an indoor unit-side heat exchanger are provided in this order from one end of the indoor unit-side refrigerant pipe in the middle of the indoor unit-side refrigerant pipe.
With the above configuration, the indoor unit can be dehumidified and heated by the dehumidifying and heating unit, and the indoor unit can be cooled by the refrigerant water heat exchange unit.
In the air conditioning system according to the present invention, it is preferable that the air conditioning system includes a plurality of the outdoor units, an outdoor unit connection pipe section of the first connection pipe connected to the plurality of outdoor units is connected to a main connection pipe section of the first connection pipe outside the outdoor units, one end of the first indoor side pipe and one end of the refrigerant pipe of the refrigerant water heat exchange unit are connected to the main connection pipe section of the first connection pipe, an outdoor unit connection pipe section of the second connection pipe connected to the plurality of outdoor units is connected to a main connection pipe section of the second connection pipe outside the outdoor units, the other end of the first indoor side pipe is connected to the main connection pipe section of the second connection pipe, and an outdoor unit connection pipe section of the third connection pipe connected to the plurality of outdoor units is connected to a main connection pipe section of the third connection pipe outside the outdoor units And a connection pipe segment in which the other end of the second indoor-side pipe and the other end of the refrigerant pipe are connected to a main connection pipe segment of the third connection pipe.
When the above-described structure is adopted, when the capacity of one outdoor unit is insufficient, a plurality of outdoor units may be activated to supply the refrigerant of an appropriate temperature, an appropriate amount, and an appropriate pressure to the dehumidifying and heating indoor unit and the refrigerant water heat exchange unit.
In the air conditioning system according to the present invention, it is preferable that a refrigerant water heat exchange unit side refrigerant conditioning device is provided between one end of the refrigerant pipe and the refrigerant water heat exchanger.
With the above configuration, the flow rate, state, and the like of the refrigerant flowing through the refrigerant pipe can be controlled.
In the air conditioning system according to the present invention, it is preferable that the refrigerant water heat exchange unit side refrigerant adjusting device is an electric valve or an electromagnetic valve.
With the above configuration, the flow rate, state, and the like of the refrigerant flowing through the refrigerant pipe can be controlled with a simple configuration.
In the air conditioning system according to the present invention, it is preferable that an electromagnetic valve be provided between the other end of the refrigerant pipe and the refrigerant water heat exchanger.
In the above configuration, since the electromagnetic valve is provided between the other end of the refrigerant pipe and the refrigerant water heat exchanger, when the temperature of the refrigerant flowing from the third connection pipe to the refrigerant water heat exchange unit is too low, the electromagnetic valve can be closed to prevent the refrigerant in the refrigerant pipe from freezing due to the too low temperature.
In the air conditioning system according to the present invention, it is preferable that the first switching device, the second switching device, and the third switching device are four-way valves.
With the above configuration, the first switching device, the second switching device, and the third switching device can be switched between the first switching state and the second switching state, respectively, with a simple configuration.
In the air conditioning system of the present invention, it is preferable that the second switching device and the third switching device are provided in the outdoor unit.
When the above-described structure is adopted, by integrating the second switching device and the third switching device in the outdoor unit, the structure of the air conditioning system becomes compact, contributing to miniaturization.
To achieve the above object, the present invention provides a control method of an air conditioning system for controlling the air conditioning system, and switching the air conditioning system between a first mode in which the first switching device is switched to a second switching state, the second switching device is switched to a second switching state, and the third switching device is switched to a first switching state, and opening the first indoor-side refrigerant adjusting device and the second indoor-side refrigerant adjusting device, a second mode in which the first switching device is switched to the first switching state, the second switching device is switched to the first switching state, and the third switching device is switched to the first switching state, and opening the first indoor-side refrigerant adjusting device and the second indoor-side refrigerant adjusting device, with a control unit, in the third mode, the first switching device is switched to a second switching state, the second switching device is switched to a first switching state, and the third switching device is switched to the first switching state, and the first indoor-side refrigerant conditioning device is turned off, the second indoor-side refrigerant conditioning device is slightly opened, in the fourth mode, the first switching device is switched to the second switching state, the second switching device is switched to the first switching state, and the third switching device is switched to the first switching state, and the first indoor-side refrigerant conditioning device is opened, the second indoor-side refrigerant conditioning device is slightly opened, in the fifth mode, the first switching device is switched to the first switching state, the second switching device is switched to the first switching state, and the third switching device is switched to a second switching state.
Incidentally, "slight open" mentioned in this specification is not intended to mean "open", "full open", or the like, nor "full closed", but means that the valve is slightly opened in order to avoid damage to the valve itself (that is, by slightly opening the valve, the pressures at both ends of the valve are balanced, thereby avoiding damage to the valve due to imbalance in the liquid pressures at both ends of the valve), which is substantially equivalent to "closed". In addition, the reference to "open" in this specification does not mean that the valve is fully open, and the specific opening of the valve can be controlled according to the requirements of the operating conditions.
In the control method of an air conditioning system according to the present invention, it is preferable that the air conditioning system is caused to perform a defrosting operation in the second mode.
In the control method of an air conditioning system according to the present invention, it is preferable that a refrigerant water heat exchange unit side refrigerant adjusting device is provided between one end of the refrigerant pipe and the refrigerant water heat exchanger, and the air conditioning system is operable by switching to a sixth mode by the control unit, and in the sixth mode, the first switching device is switched to the first switching state, the second switching device is switched to the first switching state, and the third switching device is switched to the second switching state, and the first indoor side refrigerant adjusting device and the second indoor side refrigerant adjusting device are opened and the refrigerant water heat exchange unit side refrigerant adjusting device is closed.
In the control method of an air conditioning system according to the present invention, it is preferable that in the sixth mode, the heat cycle device is stopped or operated at a low speed to perform a defrosting operation.
In the control method of an air conditioning system according to the present invention, it is preferable that in the fifth mode, the first indoor-side refrigerant conditioning device and the second indoor-side refrigerant conditioning device are turned on.
In the control method of an air conditioning system according to the present invention, it is preferable that in the fifth mode, the first indoor-side refrigerant conditioning device and the second indoor-side refrigerant conditioning device are turned on slightly.
Effects of the invention
According to the air conditioning system and the control method thereof of the present invention, when the hot-water supply dehumidification heating mode is operated, the indoor air sent from the heat cycle device can be dehumidified by the first heat exchanger of the dehumidification heating indoor unit, and the indoor air sent from the heat cycle device can be heated by the second heat exchanger of the dehumidification heating indoor unit. Therefore, compared with the structure that the electric heating unit is additionally arranged at the downstream of the dehumidification heat exchanger in the wind path formed by the indoor air supply device, the energy consumption can be reduced, the temperature distribution of the air supplied to the indoor by the dehumidification heating indoor unit can be prevented from being uneven, and the comfort of indoor personnel is improved. In addition, compared with a structure in which the dehumidification heat exchanger and the heating heat exchanger connected in series in the indoor refrigerant circuit are sequentially disposed in the air passage formed by the indoor air blowing device, both the dehumidification heat exchanger and the heating heat exchanger can sufficiently function, thereby avoiding insufficient dehumidification and insufficient heating amount.
In addition, because a part of waste heat exhausted into the atmosphere by the outdoor unit originally can be used for heating the heat exchanger to realize waste heat utilization, the energy consumption ratio can be improved, and energy conservation and environmental protection are realized.
In addition, when the outdoor unit is frosted and the system efficiency is reduced, the constant temperature defrosting operation can be carried out in the hot water supply dehumidification heating mode, namely, in the hot water supply dehumidification heating mode or the dehumidification heating only mode, the heating heat exchanger plays a heating role, and cold air can not be blown out to the indoor even if the indoor air supply device is continuously operated, so that the constant temperature defrosting can be realized.
In addition, the water flowing through the water pipe of the water circuit can be heated by the refrigerant that is sent from the outdoor unit and flows through the refrigerant pipe, and hot water can be supplied by the water circuit.
In addition, in the hot water supply and heating mode, the first heat exchanger and the second heat exchanger both function as condensers to heat the indoor air, so that the overall efficiency can be improved.
Drawings
Fig. 1 is a schematic diagram showing a circuit configuration of an air conditioning system according to embodiment 1 of the present invention, and shows a flow direction of a refrigerant when the air conditioning system is operated in a hot water supply dehumidification heating mode.
Fig. 2 is a schematic diagram showing a circuit configuration of an air conditioning system according to embodiment 1 of the present invention, and shows a flow direction of a refrigerant when the air conditioning system is operated in the hot-water supply and heating mode.
Fig. 3 is a schematic diagram showing a circuit configuration of an air conditioning system according to embodiment 1 of the present invention, and shows a flow direction of a refrigerant when the air conditioning system is operated in a hot water only mode.
Fig. 4 is a schematic diagram showing a circuit configuration of an air conditioning system according to embodiment 1 of the present invention, and shows a flow direction of a refrigerant when the air conditioning system is operated in the hot water supply and cooling mode.
Fig. 5 is a schematic diagram showing a circuit configuration of an air conditioning system according to embodiment 2 of the present invention, and shows a flow direction of a refrigerant when the air conditioning system is operated in a cooling-only mode.
Fig. 6 is a schematic diagram showing a circuit configuration of an air conditioning system according to embodiment 2 of the present invention, and shows a flow direction of a refrigerant when the air conditioning system is operated in a cold water supply cooling mode.
Fig. 7 is a schematic diagram showing a circuit configuration of an air conditioning system according to embodiment 3 of the present invention.
Fig. 8 is a schematic diagram showing a circuit configuration of an air conditioning system according to embodiment 4 of the present invention.
Fig. 9 is a schematic diagram showing a modification of the air conditioning system of the present invention.
Fig. 10 is a schematic diagram showing another modification of the air conditioning system of the present invention.
Fig. 11 is a schematic diagram showing a part of the refrigerant water heat exchange unit included in the air conditioning system according to the present invention, and shows an example in which a floor heating water circuit, a water tank, and a fan coil circuit are connected to a water circuit of the refrigerant water heat exchange unit.
Fig. 12 is a schematic diagram showing a conventional heating and dehumidifying circuit configuration.
Fig. 13 is a schematic diagram showing another conventional heating and dehumidifying circuit configuration.
(symbol description)
(embodiment mode 1)
1 air conditioning system
100 outdoor unit
110 compressor 120 outdoor side heat exchanger
130 liquid storage tank (liquid storage device) 140 outdoor air supply device
V11 valve
VF1 four-way switching valve (first switching device)
a first port b second port
c third port d fourth port
VF2 four-way switching valve (second switching device)
a1 first port b1 second port
c1 third Port d1 fourth Port
Po discharge pipe Pi suction pipe
P101 branch pipe and P102 branch pipe
P103 branch pipe and P104 branch pipe
T1 throttling device T2 throttling device
K11-K15 points
200 dehumidification heating indoor unit
210 first indoor-side heat exchanger V21 first indoor-side refrigerant conditioning device
220 second indoor heat exchanger V22 second indoor refrigerant adjusting device
230 indoor blower (heat cycle device) P201 first indoor piping
P202 second indoor side piping K20-K23 points
300 refrigerant water heat exchange unit
P301 refrigerant pipe and P302 water pipe
310 refrigerant water heat exchanger SH water loop
V31 valve (refrigerant water heat exchange unit side refrigerant adjusting device)
V32 valve
K30 and K31 points
P1 first connecting pipe P1-1 first part of first connecting pipe
P1-2 second part of the first connecting pipe P2 second connecting pipe
P2-1 first part of second connecting pipe P2-2 second part of second connecting pipe
P3 third connecting pipe P3-1 first part of third connecting pipe
Second-part VC1 stop valve of P3-2 third connecting pipe
VC2 stop valve VC3 stop valve
(embodiment mode 2)
1A air conditioning system
100' outdoor unit
VF3 four-way switching valve (third switching device)
a2 first port b2 second port
c2 third Port d2 fourth Port
P105 branch pipe and P106 branch pipe
Throttle device K16 and K17 of T3
(embodiment mode 3)
1B air conditioning system
400A indoor Unit 400B indoor Unit
P401A indoor-unit-side refrigerant pipe P401B indoor-unit-side refrigerant pipe
V41A indoor-unit-side refrigerant regulator V41B indoor-unit-side refrigerant regulator
410A indoor unit side heat exchanger 410B indoor unit side heat exchanger
K40A, K41A points, K40B and K41B points
(embodiment mode 4)
1C air conditioning system
100A outdoor Unit 100B outdoor Unit
P1A-P3A outdoor unit connecting piping segments P1B-P3B outdoor unit connecting piping segments
P1T-P3T total connecting pipe section
(other embodiments)
P107 subcooler for subcooler of pipe 150
V12 valve (refrigerant regulator) K18, K19 point
P3021 Main pipeline P3022 Branch pipeline
VC4 three-way valve
500 ground heating water loop P501 ground heating water distribution pipe
610 domestic water terminal SX water tank
P601 inlet pipe P602 domestic water piping
Water piping for 700 fan coil circuit P701 coil circuit
Detailed Description
Hereinafter, embodiments of an air conditioning system according to the present invention will be described with reference to the drawings.
(1) Embodiment mode 1
First, referring to fig. 1, the circuit configuration of the air conditioning system 1 according to embodiment 1 will be described in detail.
As shown in fig. 1, the air conditioning system 1 of the present embodiment includes an outdoor unit 100, a dehumidifying and heating indoor unit 200, and a refrigerant water heat exchange unit 300, and these outdoor unit 100, dehumidifying and heating indoor unit 200, and refrigerant water heat exchange unit 300 are connected to each other by a plurality of connection pipes including a first connection pipe P1, a second connection pipe P2, and a third connection pipe P3.
Here, shutoff valves VC1 to VC3 are provided midway among the first connection pipe P1, the second connection pipe P2, and the third connection pipe P3 (hereinafter, the range of the outdoor unit is also defined by the shutoff valves VC1 to VC3, and the first connection pipe P1, the second connection pipe P2, and the third connection pipe P3 are divided into a first section P1-1 to P3-1 and a second section P1-2 to P3-2, respectively, by the shutoff valves VC1 to VC 3). Normally, the stop valves VC 1-VC 3 are all in a normally open state. In addition, in some cases, any one or more, or even all, of the shutoff valves VC 1-VC 3 may be omitted.
(outdoor unit 100)
The outdoor unit 100 is provided with a compressor 110, an outdoor heat exchanger 120, a valve V11, and a receiver 130 (corresponding to a receiver in the present invention).
Specifically, the discharge side of the compressor 110 is connected to one end of the discharge pipe Po, the other end of the discharge pipe Po is connectable to one end of the first connection pipe P1, the suction side of the compressor 110 is connected to one end of the suction pipe Pi, one end of the second connection pipe P2 is connected to a middle portion of the suction pipe Pi, the valve V11 and the outdoor heat exchanger 120 are provided in a middle portion of a portion of the first connection pipe P1 located in the outdoor unit 100 (a portion from the second port b of the four-way switching valve VF1 described below to the shutoff valve VC 1), and the receiver 130 is provided in a middle portion of the suction pipe Pi. One end (end located at point K11 in fig. 1) of the third connecting pipe P3 branches off from the middle of the discharge pipe Po.
The outdoor unit 100 is further provided with a four-way switching valve VF1 (corresponding to the first switching device in the present invention) and a four-way switching valve VF2 (corresponding to the second switching device in the present invention), in which the four-way switching valve VF1 is switchable between a first switching state and a second switching state, the discharge pipe Po communicates with the first connection pipe P1 in the first switching state of the four-way switching valve VF1, the first connection pipe P1 communicates with the suction pipe Pi in the second switching state of the four-way switching valve VF1, the four-way switching valve VF2 is switchable between the first switching state and the second switching state, the second connection pipe P2 communicates with the suction pipe Pi in the first switching state of the four-way switching valve VF2, and the second connection pipe P2 communicates with the third connection pipe P3 in the second switching state of the four-way switching valve VF 2.
Specifically, one end of a branch pipe P101 is connected to a middle portion of the third connecting pipe P3, one end of a branch pipe P104 (an end portion located at a point K13 in fig. 1), one end of a branch pipe P102 (an end portion located at a point K14 in fig. 1), and one end of a branch pipe P103 (an end portion located at a point K15 in fig. 1) are connected in this order from the one end of the suction pipe Pi to the middle portion of the suction pipe Pi, and a throttle device T1 is provided to the middle portion of the branch pipe P102, and a throttle device T2 is provided to the middle portion of the branch pipe P103. The throttle devices T1 and T2 are preferably capillary tubes for introducing and separating the oil accumulated in the four-way switching valves VF1 and VF2 into the circuit to prevent the oil accumulation from causing the failure of the four-way switching valves VF1 and VF 2.
Further, the four-way switching valve VF1 has a first port a connected to the other end of the discharge pipe Po, a second port b connected to one end of the first connection pipe P1, a third port c connected to the other end of the suction pipe Pi, and a fourth port d connected to the other end of the branch pipe P103, the first port a communicating with the second port b and the third port c communicating with the fourth port d in the first switching state of the four-way switching valve VF1, the first port a communicating with the fourth port d and the second port b communicating with the third port c in the second switching state of the four-way switching valve VF1, and the four-way switching valve VF2 has a first port a1, a second port b1, a third port c1, and a fourth port d1, the first port a1 connected to the other end of the branch pipe P104, and the second port b1 connected to one end of the second connection pipe P2, the third port c1 is connected to the other end of the branch pipe P101, the fourth port d1 is connected to the other end of the branch pipe P102, the first port a1 communicates with the second port b1 and the third port c1 communicates with the fourth port d1 in the first switching state of the four-way switching valve VF2, and the first port a1 communicates with the fourth port d1 and the second port b1 communicates with the third port c1 in the second switching state of the four-way switching valve VF 2.
Here, the outdoor unit 100 is further provided with an outdoor air-blowing device 140, and the outdoor air-blowing device 140 blows air to the outdoor heat exchanger 120.
In addition, the valve V11 may be an electric valve or an electromagnetic valve.
(dehumidifying heating indoor unit 200)
In the dehumidifying and heating indoor unit 200, a valve V21 (corresponding to a first indoor-side refrigerant conditioning device in the present invention), a dehumidifying heat exchanger 210 (corresponding to a first heat exchanger in the present invention), a valve V22 (corresponding to a second indoor-side refrigerant conditioning device in the present invention), and a heating heat exchanger 220 (corresponding to a second heat exchanger in the present invention) are provided.
Specifically, the valve V21 and the dehumidifying heat exchanger 210 are provided in this order from one end of the first indoor-side pipe P201 (the end located at the point K20 in fig. 1) in the middle of the first indoor-side pipe P201, one end of the first indoor-side pipe P201 is connected to the portion of the first connection pipe P1 located outside the outdoor unit 100, and the other end of the first indoor-side pipe P201 (the end located at the point K21 in fig. 1) is connected to the portion of the second connection pipe P2 located outside the outdoor unit 100. Further, a valve V22 and a heating heat exchanger 220 are provided in this order from one end of the second indoor-side pipe P202 (the end located at the point K22 in fig. 1) in the middle of the second indoor-side pipe P202, one end of the second indoor-side pipe P202 is connected to the first indoor-side pipe P201 and is located between the valve V21 and one end of the first indoor-side pipe P201, and the other end of the second indoor-side pipe P202 (the end located at the point K23 in fig. 1) is connected to a portion of the third connection pipe P3 located outside the outdoor unit 100.
Further, the dehumidifying and heating indoor unit 200 is provided with an indoor air-blowing device 230 (corresponding to a heat cycle device in the present invention), the indoor air-blowing device 230 is used for blowing heat or cold of the dehumidifying and heating indoor unit 200 into the room, and the dehumidifying heat exchanger 210 and the heating heat exchanger 220 are provided in a flow path of an air flow formed by the indoor air-blowing device 230. Here, the dehumidifying heat exchanger 210 is provided upstream of the heating heat exchanger 220 in the flow path of the air flow formed by the indoor air-sending device 230.
Further, the valves V21 and V22 may be electric valves or electromagnetic valves.
(refrigerant Water Heat exchange Unit 300)
The refrigerant water heat exchange unit 300 is provided with a refrigerant pipe P301, a water circuit SH, and a refrigerant water heat exchanger 310.
Specifically, one end (end located at point K30 in fig. 1) of the refrigerant pipe P301 is connected to a portion of the first connection pipe P1 located outside the outdoor unit 100, the other end (end located at point K31 in fig. 1) of the refrigerant pipe P301 is connected to a portion of the third connection pipe P3 located outside the outdoor unit 100, the water circuit SH is configured by the water pipe P302, and the refrigerant water heat exchanger 310 exchanges heat between the refrigerant flowing through the refrigerant pipe P301 and the water flowing through the water pipe P302.
Here, valves V31 and V32 are further provided in the middle of the refrigerant pipe P301, where the valve V31 (corresponding to the refrigerant water heat exchange unit side refrigerant conditioning device in the present invention) is provided between one end of the refrigerant pipe P301 (the end located at the point K30 in fig. 1) and the refrigerant water heat exchanger 310, and the valve V32 is provided between the other end of the refrigerant pipe P301 (the end located at the point K31 in fig. 1) and the refrigerant water heat exchanger 310.
Further, the valve V31 may be an electric valve or an electromagnetic valve, and the valve V32 may be an electromagnetic valve, but is not limited thereto.
The air conditioning system 1 according to the present embodiment further includes a control unit (not shown) for controlling operations of components of the air conditioning system 1, such as the compressor 110, the outdoor air blowing device 140, the indoor air blowing device 230, the valve V11, the four-way switching valve VF1, the four-way switching valve VF2, the valve V21, the valve V22, the valve V31, and the valve V32.
Next, the operation of the air conditioning system 1 of the present embodiment will be described with reference to fig. 1 to 4.
The air conditioning system 1 of the present embodiment can switch operation between a hot water supply dehumidification heating mode, a hot water supply only mode, and a hot water supply cooling mode.
(Hot Water heating dehumidification heating mode)
In the hot-water supply dehumidification heating mode, as shown in fig. 1, the control unit of the air conditioning system 1 switches the four-way switching valve VF1 to the first switching state (the state shown by the solid line in fig. 1), switches the four-way switching valve VF2 to the first switching state (the state shown by the solid line in fig. 1), and opens the valve V11, the valve V21, the valve V22, the valve V31, and the valve V32. At this time, in the refrigerant water heat exchange unit 300, it is preferable to flow water in the water pipe P302 of the water circuit SH in the direction of the arrow in fig. 1.
In this state, the compressor 110 of the outdoor unit 100 compresses the refrigerant, and the refrigerant compressed in the compressor 110 and discharged to the discharge pipe Po is branched at a point K11 in fig. 1, and a part of the refrigerant flows into the first connection pipe P1 via the four-way switching valve VF1, and the remaining part of the refrigerant flows into the third connection pipe P3.
The refrigerant flowing into the first connection pipe P1 is sent to the outdoor heat exchanger 120, exchanges heat with outdoor air sent from the outdoor air-sending device 13 in the outdoor heat exchanger 120, and then flows through the valve V11. The refrigerant having passed through the valve V11 flows out of the outdoor unit 100 via the shutoff valve VC 1.
The refrigerant flowing into the third connection pipe P3 flows out of the outdoor unit 100 through the shutoff valve VC3, and then, it is branched at a point K23 in fig. 1, a part of it flows into the second indoor-side pipe P202 of the dehumidifying and heating indoor unit 200 and is sent to the heating heat exchanger 220 of the dehumidifying and heating indoor unit 200, and the remaining part thereof flows into the refrigerant pipe P301 of the refrigerant water heat exchange unit 300 at a point K31.
The refrigerant flowing into the second heat exchanger 220 exchanges heat with air sent from the indoor air blowing device 230 in the second heat exchanger 220 to heat the indoor air, and then flows through the valve V22.
The refrigerant flowing into the refrigerant pipe P301 passes through the valve V32, is sent to the refrigerant water heat exchanger 310, exchanges heat with the water flowing through the water pipe P302 of the water circuit SH in the refrigerant water heat exchanger 310, and heats the water flowing through the water pipe P302 to provide hot water. The refrigerant having exchanged heat with the water flowing through the water pipe P302 in the refrigerant water heat exchanger 310 flows through the valve V31, and then flows into the first connection pipe P1 at the point K30.
At point K20 in fig. 1, the refrigerant flowing out of the outdoor unit 100 via the shutoff valve VC1 merges with the refrigerant flowing into the first connection pipe P1 at point K30, flows into the dehumidifying and heating indoor unit 200 together, and then merges with the refrigerant flowing through the valve V22 at point K22 in fig. 1. The merged refrigerant flows through the valve V21, flows into the first heat exchanger 210, and then exchanges heat with the indoor air sent from the indoor air blowing device 230 in the first heat exchanger 210, thereby dehumidifying the indoor air. The refrigerant that has exchanged heat with the indoor air in the first heat exchanger 210 flows out of the dehumidification-heating indoor unit 200 at point K21, flows into the second connection pipe P2, flows into the outdoor unit 100 via the shutoff valve VC2, and flows into the branch pipe P104 via the four-way switching valve VF 2. The refrigerant flowing into the branch pipe P104 flows into the suction pipe Pi at a point K13 and then returns to the compressor 110 via the receiver 130.
(dehumidification heating only mode)
In the dehumidification heating mode, as shown in fig. 1, the control unit of the air conditioning system 1 switches the four-way switching valve VF1 to the first switching state (the state shown by the solid line in fig. 1), switches the four-way switching valve VF2 to the first switching state (the state shown by the solid line in fig. 1), opens the valves V11, V21, and V22, and closes the valve V31. Here, the valve V32 may be either open or closed. At this time, in the refrigerant water heat exchange unit 300, it is not necessary to flow water in the water circuit SH.
Here, the flow of the refrigerant is substantially the same as the hot water heating and dehumidifying/heating mode described above except that the refrigerant does not flow in the refrigerant water heat exchange unit 300, and therefore, the detailed description thereof will be omitted.
(Hot Water supplying and heating mode)
In the hot-water supply dehumidification heating mode, as shown in fig. 2, the control unit of the air conditioning system 1 switches the four-way switching valve VF1 to the second switching state (the state shown by the solid line in fig. 2), switches the four-way switching valve VF2 to the second switching state (the state shown by the solid line in fig. 2), and opens the valve V11, the valve V21, the valve V22, the valve V31, and the valve V32. At this time, in the refrigerant water heat exchange unit 300, it is preferable to flow water in the water pipe P302 of the water circuit SH in the direction of the arrow in fig. 1.
In this state, the compressor 110 of the outdoor unit 100 compresses the refrigerant, and the refrigerant compressed in the compressor 110 and discharged to the discharge pipe Po flows into the first portion P3-1 of the third connecting pipe P3 at the point K11. The refrigerant flowing into the first portion P3-1 of the third connecting pipe P3 branches at point K12 in fig. 2, a portion flows into the branch pipe P101, and the remaining portion flows out of the outdoor unit 100 via the shutoff valve VC 3.
The refrigerant flowing into the branch pipe P101 flows into the second connection pipe P2 via the four-way switching valve VF2, flows out of the outdoor unit 100 via the shutoff valve VC2, and then flows into the first indoor side pipe P201 of the dehumidifying and heating indoor unit 200 at point K21. The first indoor-side pipe P201 is sent to the first heat exchanger 210, and heat exchange is performed with the air sent from the indoor air blowing device 230 in the first heat exchanger 210, thereby heating the indoor air. The refrigerant heat-exchanged with air in the first heat exchanger 210 flows through the valve V21.
The refrigerant flowing out of the outdoor unit 100 is split at point K23, and a part of the refrigerant flows into the second indoor-side pipe P202 of the dehumidification-heating indoor unit 200, and the remaining part of the refrigerant flows into the refrigerant pipe P301 of the refrigerant-water heat exchange unit 300 at point K31.
The refrigerant flowing into the second indoor pipe P202 is sent to the second heat exchanger 220, and exchanges heat with air sent from the indoor air blowing device 230 in the second heat exchanger 220, thereby heating the indoor air. The refrigerant heat-exchanged with air in the second heat exchanger 220 flows through the valve V22 and merges with the refrigerant flowing through the valve V21 at point K22.
The refrigerant flowing into the refrigerant pipe P301 passes through the valve V32, is sent to the refrigerant water heat exchanger 310, and exchanges heat with the water flowing through the water pipe P302 of the water circuit SH in the refrigerant water heat exchanger 310, thereby heating the water in the water pipe P302 to provide hot water by the water circuit SH. Then, the refrigerant flows through the valve V31, flows into the first connection pipe P1 at the point K30, and merges with the refrigerant merged at the point K22 at the point K20.
The merged refrigerant flows into the outdoor unit 100 through the shutoff valve VC1, flows through the valve V11, and is sent to the outdoor heat exchanger 120. The refrigerant sent to the outdoor heat exchanger 120 exchanges heat with outdoor air sent from the outdoor air-sending device 13 in the outdoor heat exchanger 120, flows into the suction pipe Pi through the four-way switching valve VF1, and returns to the compressor 110 through the receiver 130.
(Hot Water supply mode only)
In the hot water only mode, as shown in fig. 3, the control unit of the air conditioning system 1 switches the four-way switching valve VF1 to the second switching state (the state shown by the solid line in fig. 3), switches the four-way switching valve VF2 to the first switching state (the state shown by the solid line in fig. 3), opens the valve V11, the valve V31, and the valve V32, closes the valve V21, and slightly opens the valve V22. At this time, in the refrigerant water heat exchange unit 300, it is preferable to flow water in the water pipe P302 of the water circuit SH in the direction of the arrow in fig. 1.
In this state, the compressor 110 of the outdoor unit 100 compresses the refrigerant, and the refrigerant compressed in the compressor 110 and discharged to the discharge pipe Po flows into the third connecting pipe P3 at point K11, and then flows out of the outdoor unit 100 via the shutoff valve VC 3.
The refrigerant flowing out of the outdoor unit 100 flows into the refrigerant pipe P301 of the refrigerant water heat exchange unit 300 at point K31, passes through the valve V32, and is sent to the refrigerant water heat exchanger 310. The refrigerant sent to the refrigerant water heat exchanger 310 exchanges heat with water flowing through the water pipe P302 of the water circuit SH in the refrigerant water heat exchanger 310, thereby heating the water in the water pipe P302 to supply hot water through the water circuit SH. The refrigerant having exchanged heat in the refrigerant water heat exchanger 310 flows through the valve V31, and flows into the first connection pipe P1 at point K30.
The refrigerant flowing into the first connection pipe P1 flows into the outdoor unit 100 through the shutoff valve VC1, flows through the valve V11, and is sent to the outdoor heat exchanger 120. The refrigerant sent to the outdoor heat exchanger 120 exchanges heat with outdoor air sent from the outdoor air-sending device 13 in the outdoor heat exchanger 120, flows into the suction pipe Pi through the four-way switching valve VF1, and returns to the compressor 110 through the receiver 130.
(Hot Water supplying Cooling mode)
In the hot water only mode, as shown in fig. 4, the control unit of the air conditioning system 1 switches the four-way switching valve VF1 to the second switching state (the state shown by the solid line in fig. 4), switches the four-way switching valve VF2 to the first switching state (the state shown by the solid line in fig. 4), opens the valve V11, the valve V21, the valve V31, and the valve V32, and slightly opens the valve V22. At this time, in the refrigerant water heat exchange unit 300, it is preferable to flow water in the water pipe P302 of the water circuit SH in the direction of the arrow in fig. 1.
In this state, the compressor 110 of the outdoor unit 100 compresses the refrigerant, and the refrigerant compressed in the compressor 110 and discharged to the discharge pipe Po flows into the third connecting pipe P3 at point K11, and then flows out of the outdoor unit 100 via the shutoff valve VC 3.
The refrigerant flowing out of the outdoor unit 100 flows into the refrigerant pipe P301 of the refrigerant water heat exchange unit 300 at point K31, passes through the valve V32, and is sent to the refrigerant water heat exchanger 310. The refrigerant sent to the refrigerant water heat exchanger 310 exchanges heat with water flowing through the water pipe P302 of the water circuit SH in the refrigerant water heat exchanger 310, thereby heating the water in the water pipe P302 to supply hot water through the water circuit SH. The refrigerant having exchanged heat in the refrigerant water heat exchanger 310 flows through the valve V31, and flows into the first connection pipe P1 at point K30.
The refrigerant flowing into the first connection pipe P1 is branched at a point K20, a part of the refrigerant flows into the first indoor side pipe P201 of the dehumidifying and heating indoor unit 200, and the remaining part of the refrigerant flows into the outdoor unit 100 via the shutoff valve VC 1.
The refrigerant flowing into the first indoor-side pipe P201 passes through the valve V21, and is sent to the first indoor-side heat exchanger 210. The refrigerant sent to the first indoor heat exchanger 210 exchanges heat with the indoor air sent from the indoor air blower 230 in the first indoor heat exchanger 210 and in the first heat exchanger 210, thereby cooling the indoor air. The refrigerant having exchanged heat in the first heat exchanger 210 flows into the second connection pipe P2 at a point K21, and flows into the outdoor unit 100 via the shutoff valve VC 2.
The refrigerant flowing into the outdoor unit 100 through the shutoff valve VC1 passes through the valve V11, is sent to the outdoor heat exchanger 120, exchanges heat with outdoor air sent from the outdoor air blower 13 in the outdoor heat exchanger 120, and then flows into the suction pipe Pi through the four-way switching valve VF 1.
The refrigerant flowing into the outdoor unit 100 through the shutoff valve VC2 flows into the branch pipe P104, merges with the refrigerant flowing into the suction pipe Pi through the four-way switching valve VF1 at point K13, and returns to the compressor 110 through the receiver 130.
According to the air conditioning system 1 of the present embodiment, operation can be performed in the hot-water-supply dehumidification heating mode, the hot-water-supply heating mode, the hot-water-only mode, and the hot-water-supply cooling mode.
In addition, according to the air conditioning system 1 of the present embodiment, during operation in the hot-water supply dehumidification and heating mode, the indoor air sent from the indoor air-sending device 230 is dehumidified by the dehumidification heat exchanger 210 of the dehumidification-heating indoor unit 200, and the indoor air sent from the indoor air-sending device 230 can be heated by the heating heat exchanger 220 of the dehumidification-heating indoor unit 200. Therefore, compared to a configuration in which an electric heating unit is added downstream of the dehumidification heat exchanger in the air passage formed by the indoor air blowing device, the air conditioning system 1 of the present embodiment can reduce energy consumption, prevent the temperature distribution of the air supplied to the room by the dehumidification heating indoor unit from becoming uneven, and improve the comfort of the indoor personnel. In addition, compared to a configuration in which the dehumidification heat exchanger and the heating heat exchanger connected in series to the indoor refrigerant circuit are sequentially disposed in the air passage formed by the indoor air-blowing device, the air conditioning system 1 of the present embodiment can prevent insufficient dehumidification and insufficient heating amount by allowing both the dehumidification heat exchanger and the heating heat exchanger to function sufficiently.
In addition, because a part of waste heat exhausted into the atmosphere by the outdoor unit originally can be used for heating the heat exchanger to realize waste heat utilization, the energy consumption ratio can be improved, and energy conservation and environmental protection are realized.
In addition, according to the air conditioning system 1 of the present embodiment, when the outdoor unit 100 is frosted and the system efficiency is reduced, the constant temperature defrosting operation can be performed in the hot water supply dehumidification heating mode, that is, in the hot water supply dehumidification heating mode or the dehumidification-only heating mode, the heating heat exchanger 220 performs a heating function, and cold air is not blown into the room even if the indoor air blowing device 230 continues to operate, so that constant temperature defrosting can be achieved.
Further, according to the air conditioning system 1 of the present embodiment, since the refrigerant water heat exchange unit 300 includes the refrigerant pipe P301, the water circuit SH formed by the water pipe P302, and the refrigerant water heat exchanger 310 that exchanges heat between the refrigerant flowing through the refrigerant pipe P301 and the water flowing through the water pipe P302, the water flowing through the water pipe P302 of the water circuit SH can be heated by the refrigerant flowing through the refrigerant pipe P301 and sent from the outdoor unit 100, and hot water can be supplied by the water circuit SH.
In addition, according to the air conditioning system 1 of the present embodiment, in the hot water supply and heating mode, both the dehumidification heat exchanger 210 and the heating heat exchanger 220 function as condensers to heat the indoor air, and therefore, the overall efficiency can be improved.
(2) Embodiment mode 2
First, a circuit configuration of an air conditioning system 1A according to embodiment 2 of the present invention will be described with reference to fig. 5, in which the same components as those of embodiment 1 are denoted by the same reference numerals in fig. 2.
Since the air conditioning system 1A of embodiment 2 is basically the same in configuration as the air conditioning system 1 of embodiment 1, differences from embodiment 1 will be mainly described below.
In the present embodiment, the outdoor unit 100' is provided with a branch pipe P105 having one end (an end located at a point K16 in fig. 5) connected to the suction pipe Pi.
The third connecting pipe P3 includes a first portion P3-1 (a portion from point K11 in fig. 5 to port a2 of the four-way switching valve VF3 described below) and a second portion P3-2 (a portion from port b2 of the four-way switching valve VF3 described below to point K31 in fig. 5), the first portion P3-1 is connected to the discharge pipe Po, and the second portion P3-2 is connected to the second indoor-side pipe P202 and the refrigerant pipe P301.
In the present embodiment, the outdoor unit 100' further includes a four-way switching valve VF3 (corresponding to the third switching device in the present invention), and the four-way switching valve VF3 is switchable between a first switching state in which the second portion P3-2 of the third connecting pipe P3 communicates with the first portion P3-1 of the third connecting pipe P3 and a second switching state in which the second portion P3-2 of the third connecting pipe P3 communicates with the other end of the branch pipe P105 in the first switching state of the four-way switching valve VF3 and a second switching state in which the four-way switching valve VF3 is switched.
Specifically, the four-way switching valve VF3 has a first port a2, a second port b2, and a third port c2, wherein the first port a2 is connected to the first portion P3-1 of the third connection pipe P3, the second port b2 is connected to the second portion P3-2 of the third connection pipe P3, and the third port c2 is connected to the other end of the branch pipe P105, and wherein the first port a2 is communicated with the second port b2 in the first switching state of the four-way switching valve VF3, and the second port b2 is communicated with the third port c2 in the second switching state of the four-way switching valve VF 3.
Here, as shown in fig. 5, the outdoor unit 100' is further provided with a branch pipe P106 having one end (an end located at a point K17 in fig. 5) connected to the branch pipe P105, a throttle device T3 is provided in the middle of the branch pipe P106, the four-way switching valve VF3 further has a fourth port d2 connected to the other end of the branch pipe P106, the first port a2 communicates with the second port b2 and the third port c2 communicates with the fourth port d2 in the first switching state of the four-way switching valve VF3, and the second port b 25 communicates with the third port 73c 2 and the first port a2 communicates with the fourth port d2 in the second switching state of the four-way switching valve VF 3. The throttle device T3 is preferably a capillary tube for introducing the oil accumulated in the four-way switching valve VF3 into the circuit for separation and recovery, thereby preventing the oil accumulation from causing the failure of the four-way switching valve VF 3.
Next, the operation of the air conditioning system 1A of the present embodiment will be described with reference to fig. 5 and 6.
The air conditioning system 1 of the present embodiment is capable of switching operation among a hot water supply dehumidification heating mode, a dehumidification heating only mode, a hot water supply heating and heating mode, a hot water supply only mode, a hot water supply cooling mode, a cooling only mode, and a cooling water supply cooling mode, wherein in the hot water supply dehumidification heating mode and the dehumidification heating only mode, the four-way switching valve VF1 is switched to a first switching state, the four-way switching valve VF2 is switched to a first switching state, the four-way switching valve VF3 is switched to the first switching state, in the hot water supply heating mode, the four-way switching valve VF1 is switched to a second switching state, the four-way switching valve 2 is switched to the second switching state, the four-way switching valve VF3 is switched to the first switching state, in the hot water supply only mode and the hot water supply cooling mode, the four-way switching valve VF1 is switched to the second switching state, the four-way switching valve VF2 is switched to the first switching state, and the, in the cooling-only mode and the cooling water supply cooling mode, the four-way switching valve VF1 is switched to the first switching state, the four-way switching valve VF2 is switched to the first switching state, and the four-way switching valve VF3 is switched to the second switching state.
In addition, since the hot-water supply dehumidification heating mode, the dehumidification heating only mode, the hot-water supply heating mode, the hot-water supply only mode, and the hot-water supply air-cooling mode of the air-conditioning system 1A according to the present embodiment are the same as the hot-water supply dehumidification heating mode, the dehumidification heating only mode, the hot-water supply air-heating mode, the hot-water supply only mode, and the hot-water supply air-cooling mode of the air-conditioning system 1 according to embodiment 1 described above, only the air-cooling mode and the cold-water supply air-cooling mode will be described below.
(Cooling only mode)
In the cooling-only mode, as shown in fig. 5, the control unit of the air conditioning system 1 switches the four-way switching valve VF1 to the first switching state (the state shown by the solid line in fig. 5), switches the four-way switching valve VF2 to the first switching state (the state shown by the solid line in fig. 5), switches the four-way switching valve VF3 to the second switching state (the state shown by the solid line in fig. 5), switches the valves V11, V21, and V22, and closes the valve V31. Here, the valve V32 may be either open or closed. At this time, in the refrigerant water heat exchange unit 300, it is not necessary to flow water in the water circuit SH.
In this state, the compressor 110 of the outdoor unit 100 compresses the refrigerant, the refrigerant compressed in the compressor 110 and discharged to the discharge pipe Po flows into the first connection pipe P1 via the four-way switching valve VF1, and is then sent to the outdoor heat exchanger 120. The refrigerant sent to the outdoor heat exchanger 120 is heat-exchanged with outdoor air sent from the outdoor air-sending device 13 in the outdoor heat exchanger 120, and then flows through the valve V11. The refrigerant having passed through the valve V11 flows out of the outdoor unit 100 via the shutoff valve VC 1.
Next, the refrigerant flows into the first indoor-side pipe P201 of the indoor dehumidifying and heating unit 200 at the point K20, is branched at the point K22, flows partially through the valve V21, and is sent to the first heat exchanger 210, and the remaining portion is sent to the second heat exchanger 220 through the flow-through valve V22.
The refrigerant sent to the first heat exchanger 210 exchanges heat with the indoor air sent from the indoor air blowing device 230 in the first heat exchanger 210, and cools the indoor air. The refrigerant having exchanged heat with the indoor air in the first heat exchanger 210 flows into the second connection pipe P2 at point K21, and flows into the outdoor unit 100 via the shutoff valve VC 2. Then, the refrigerant flows into the branch pipe P104 via the four-way switching valve VF2, and flows into the suction pipe Pi at point K13.
The refrigerant sent to the second heat exchanger 220 exchanges heat with the indoor air sent from the indoor air blowing device 230 in the second heat exchanger 220, and cools the indoor air. The refrigerant having exchanged heat with the indoor air in the second heat exchanger 220 flows into the third connecting pipe P3 at point K23, and flows into the outdoor unit 100 via the shutoff valve VC 3. Then, the refrigerant flows into the branch pipe P106 via the four-way switching valve VF3, merges with the refrigerant flowing into the suction pipe Pi at the point K13 at the point K16, and returns to the compressor 110 via the receiver 130.
(Cold water supply refrigeration mode)
In the cooling-only mode, as shown in fig. 6, the control unit of the air conditioning system 1 switches the four-way switching valve VF1 to the first switching state (the state shown by the solid line in fig. 6), switches the four-way switching valve VF2 to the first switching state (the state shown by the solid line in fig. 6), switches the four-way switching valve VF3 to the second switching state (the state shown by the solid line in fig. 6), and opens the valve V11, the valve V21, the valve V22, the valve V31, and the valve V32. At this time, in the refrigerant water heat exchange unit 300, it is preferable to flow water in the water pipe P302 of the water circuit SH in the direction of the arrow in fig. 1.
In this state, the compressor 110 of the outdoor unit 100 compresses the refrigerant, the refrigerant compressed in the compressor 110 and discharged to the discharge pipe Po flows into the first connection pipe P1 via the four-way switching valve VF1, and is then sent to the outdoor heat exchanger 120. The refrigerant sent to the outdoor heat exchanger 120 is heat-exchanged with outdoor air sent from the outdoor air-sending device 13 in the outdoor heat exchanger 120, and then flows through the valve V11. The refrigerant having passed through the valve V11 flows out of the outdoor unit 100 via the shutoff valve VC 1.
Next, the refrigerant is branched at a point K20, and a part of the refrigerant flows into the first indoor pipe P201 of the dehumidification-heating indoor unit 200, and the remaining part of the refrigerant flows into the refrigerant pipe P301 of the refrigerant-water heat exchange unit 300 at a point K30.
The refrigerant flowing into the first indoor-side pipe P201 is further split at a point K22, a part of the refrigerant flows through the valve V21 and is sent to the first heat exchanger 210, and the remaining part of the refrigerant flows through the valve V22 and is sent to the second heat exchanger 220.
The refrigerant flowing into the refrigerant pipe P301 passes through the valve V31, and is sent to the refrigerant water heat exchanger 310. The refrigerant sent to the refrigerant water heat exchanger 310 exchanges heat with water flowing through the water pipe P302 of the water circuit SH in the refrigerant water heat exchanger 310, thereby cooling the water in the water pipe P302 to supply cold water through the water circuit SH. Then, the refrigerant flows into the third connecting pipe P3 at point K31.
The refrigerant sent to the first heat exchanger 210 exchanges heat with the indoor air sent from the indoor air blowing device 230 in the first heat exchanger 210, and cools the indoor air. The refrigerant having exchanged heat with the indoor air in the first heat exchanger 210 flows into the second connection pipe P2 at point K21, and flows into the outdoor unit 100 via the shutoff valve VC 2. Then, the refrigerant flows into the branch pipe P104 via the four-way switching valve VF2, and flows into the suction pipe Pi at point K13.
The refrigerant sent to the second heat exchanger 220 exchanges heat with the indoor air sent from the indoor air blowing device 230 in the second heat exchanger 220, and cools the indoor air. The refrigerant that has exchanged heat with the indoor air in the second heat exchanger 220 merges with the refrigerant that has flowed into the third connecting pipe P3 at point K23 and point K31, and flows into the outdoor unit 100 via the shutoff valve VC 3. Then, the refrigerant flows into the branch pipe P105 via the four-way switching valve VF3, merges with the refrigerant flowing into the suction pipe Pi at the point K13 at the point K16, and returns to the compressor 110 via the receiver 130.
(Cold water supply only mode)
In the cold water only mode, as shown in fig. 6, the control unit of the air conditioning system 1 switches the four-way switching valve VF1 to the second switching state (the state shown by the solid line in fig. 6), switches the four-way switching valve VF2 to the first switching state (the state shown by the solid line in fig. 6), opens the valves V11, V31, and V32, and slightly opens the valves V21 and V22. At this time, in the refrigerant water heat exchange unit 300, it is preferable to flow water in the water pipe P302 of the water circuit SH in the direction of the arrow in fig. 6.
Here, the refrigerant flows in substantially the same manner as the cooling and cooling water mode described above except that the refrigerant does not flow in the dehumidifying and heating indoor unit 200, and thus, detailed description thereof will be omitted.
For convenience of understanding, the states of the valves VF1, VF2, VF3, V11, V21, V22, V31, and V32 (including the connection states of the ports of the four-way switching valve) in the respective modes of the air conditioning system 1A according to the present embodiment are shown in table 1 below.
[ TABLE ]1
In table 1, the hot-water supply dehumidification and heating mode corresponds to the second mode of the present invention, the hot-water supply and heating mode corresponds to the first mode of the present invention, the hot-water only mode corresponds to the third mode of the present invention, the hot-water supply and cooling mode corresponds to the fourth mode of the present invention, the cold-water supply and cooling-only mode corresponds to the fifth mode of the present invention, and the cooling-only mode corresponds to the sixth mode of the present invention.
According to the air conditioning system 1A of the present embodiment, operation can be performed in the hot water supply dehumidification heating mode, the dehumidification heating only mode, the hot water supply heating mode, the hot water supply only mode, the hot water supply cooling mode, the cooling only mode, the cooling water supply cooling mode, and the cooling water supply only mode.
In addition, according to the air conditioning system 1A of the present embodiment, the four-way switching valve VF3 is switched to the first switching state, so that the same technical effects as those of the above-described embodiment 1 can be obtained.
Further, according to the air conditioning system 1A of the present embodiment, when the outdoor unit 100' frosts and the system efficiency is reduced, the normal defrosting operation can be performed only in the cooling mode. In this case, in order to avoid the influence of the decrease in the indoor temperature on the comfort of the indoor people, it is preferable to stop the operation of the indoor air blowing device 230, but the present invention is not limited thereto, and the indoor air blowing device 230 may be operated at a low speed to supply a weak airflow into the room. Incidentally, the defrosting speed of the ordinary defrosting operation performed in the cooling-only mode is faster than that of the constant temperature defrosting operation mentioned in the above embodiment 1.
(3) Embodiment 3
An air conditioning system 1B according to embodiment 3 of the present invention will be described with reference to fig. 7, in which the same reference numerals are given to the same components as those in embodiment 2 in fig. 7.
Since the air conditioning system 1B of the present embodiment is basically the same in configuration as the air conditioning system 1A of embodiment 2, differences from embodiment 2 will be mainly described below.
In the present embodiment, as shown in fig. 7, the air conditioning system 1B further includes indoor units 400A and 400B in addition to the air conditioning system 1A of embodiment 2 described above, the indoor units 400A and 400B include indoor-unit-side refrigerant pipes P401A and P401B, one ends (ends located at points K40A and K40B in fig. 7) of the indoor-unit-side refrigerant pipes P401A and P401B are connected to a portion of the first connection pipe P1 located outside the outdoor unit 100, the other ends (ends located at points K41A and K41B in fig. 7) of the indoor-unit-side refrigerant pipes P401A and P401 853 are connected to a portion of the second connection pipe P2 located outside the outdoor unit 100, and a valve V41V A and a valve V582 (corresponding to the indoor-unit-side refrigerant heat exchanger apparatus a) and the indoor-side heat exchanger apparatus 410 of the present invention are provided in this order from one end of the indoor-unit-side refrigerant pipes P401A and P401B in the indoor-side refrigerant pipes P401B and P401B 38, 410B.
According to the air conditioning system 1B of the present embodiment, basically the same technical effects as those of the air conditioning system 1A of embodiment 2 described above can be achieved.
In the air conditioning system 1B according to the present embodiment, the indoor units 400A and 400B can be switched between the cooling operation and the heating operation by switching the four-way switching valves VF1, VF2, and VF 3.
(4) Embodiment 4
An air conditioning system 1C according to embodiment 4 of the present invention will be described with reference to fig. 8, in which the same reference numerals are given to the same components as those in embodiment 3 in fig. 4.
Since the air conditioning system 1C of the present embodiment is basically the same in configuration as the air conditioning system 1B of embodiment 3, differences from embodiment 3 will be mainly described below.
In the present embodiment, as shown in fig. 8, the air conditioning system 1C includes an outdoor unit 100B having the same configuration as the outdoor unit 100A, in addition to an outdoor unit 100A corresponding to the outdoor unit 100' in embodiment 3, and these outdoor units 100A and 100B are connected in parallel to each other by the first connection pipe P1, the second connection pipe P2, and the third connection pipe P3.
Specifically, the outdoor-unit connection pipe segments P1A and P1B of the first connection pipe P1 connected to the outdoor units 100A and 100B converge to the main connection pipe segment P1T of the first connection pipe P1 outside the outdoor units 100A and 100B, one end of the first indoor-side pipe P201 (the end located at the point K20 in fig. 8), one end of the refrigerant pipe P310 of the refrigerant water heat exchange unit 300 (the end located at the point K30 in fig. 8), and one ends of the indoor-unit-side refrigerant pipes P401A and P401B (the ends located at the points K40A and K40B in fig. 8) are connected to the main connection pipe segment P1T of the first connection pipe P2, one end of the outdoor-unit connection pipe segments P2A and P2B of the second connection pipe P2 connected to the outdoor units 100A and 100B (the end located at the point K T of the outdoor-unit 100A and 100B, and the other end of the indoor-unit-side refrigerant pipe segment P3527 (the indoor-side 21) of the first connection pipe P21 and the outdoor-side 21 of the second connection pipe P2, The other end of the P401B (the end located at the point K41A and the point K41B in fig. 8) is connected to the main connection pipe segment P2T of the second connection pipe P2, the outdoor unit connection pipe segments P3A and P3B of the third connection pipe P3 connected to the outdoor units 100A and 100B converge to the main connection pipe segment P3T of the third connection pipe P3 outside the outdoor units 100A and 100B, and the other end of the second indoor side pipe P202 (the end located at the point K23 in fig. 8) and the other end of the refrigerant pipe P301 (the end located at the point K31 in fig. 8) are connected to the main connection pipe segment P3T of the third connection pipe P3.
According to the air conditioning system 1C of the present embodiment, basically the same technical effects as those of the air conditioning system 1B of embodiment 3 can be obtained.
In addition, according to the air conditioning system 1C of the present embodiment, in the case where the capacity is insufficient when only one of the outdoor unit 100A and the outdoor unit 100B is started, the outdoor unit 100A and the outdoor unit 100B may be simultaneously started to supply the refrigerant of an appropriate temperature, an appropriate amount, and an appropriate pressure to the dehumidifying and heating indoor unit 200, the refrigerant water heat exchange unit 300, and the like.
(5) Other embodiments
While particular embodiments of the present invention have been described above, it will be understood that the above embodiments are not to be construed as limiting the invention and that many modifications may be made by those skilled in the art based on the above disclosure without departing from the scope of the invention.
For example, in embodiment 1 described above, as shown in fig. 9, the outdoor unit 100 may be provided with a subcooling circuit including a cooling pipe P107, a valve V12 (corresponding to the refrigerant adjusting device in the present invention), and a subcooler 150, wherein one end (an end located at a point K19 in fig. 9) of the subcooling pipe P107 is connected to the first connection pipe P1 at a position closer to the other end side of the first connection pipe P1 than the outdoor heat exchanger 120, the other end (an end located at a point K18 in fig. 9) of the subcooling pipe P107 is connected to the suction pipe Pi, the valve V12 is provided in the middle of the subcooling pipe P107, and the subcooler 150 exchanges heat between the refrigerant flowing through the first connection pipe P1 and the refrigerant flowing through the valve V12 in the subcooling pipe P107.
According to the above configuration, the refrigerant flowing through the first outdoor side pipe P101 can be cooled by the subcooler 150, and thereby the ability of the dehumidifying heat exchanger 210 of the dehumidifying and heating indoor unit 200 to dehumidify the indoor air sent from the indoor air-sending device 230 can be enhanced.
Similarly, in embodiment 2, a subcooling circuit as shown in fig. 9 may be provided.
Further, in embodiment 2 described above, one end of the branch pipe P105 is connected to the suction pipe Pi, but the present invention is not limited to this, and as shown in fig. 10, one end of the branch pipe P105 may be connected to the accumulator 130. Similarly, in embodiments 3 and 4, the connection method of the branch pipe P105 shown in fig. 10 can be adopted.
In embodiments 1 to 4, as shown in fig. 11, a floor heating water circuit 500, a water tank SX, and a fan coil circuit 700 may be connected to the water circuit SH of the refrigerant water heat exchange unit 300. Here, the water pipe P302 includes a main pipe P3021 and a branch pipe P3022, and the branch pipe P3022 is connected to the main pipe P3021 via a three-way valve VC 4. The floor heating water circuit 500 includes a floor heating water pipe P501 having both ends connected to a main pipe P3021 of the water pipe P302. The branch line P3022 passes through the tank SX, and the tank SX is provided with a water inlet pipe P601 and a domestic water pipe P602 connected to a domestic water terminal 610 such as a faucet or a shower. The fan-coil circuit 700 includes a coil-circuit water pipe P701 having both ends connected to a main pipe P3021 of the water pipe P302. In addition, here, the floor heating water circuit 500 is shown to include only one floor heating water pipe P501, but the present invention is not limited thereto, and the floor heating water circuit 500 may include a plurality of floor heating water pipes P501 connected in parallel. Similarly, although the fan coil circuit 700 includes only one coil-circuit water pipe P701, the present invention is not limited to this, and the fan coil circuit 700 may include a plurality of coil-circuit water pipes P701 connected in parallel. Of course, in the structure shown in fig. 11, any one or both of the floor heating water circuit 500, the water tank SX (together with the water inlet pipe P601, the domestic water pipe P602, and the domestic water terminal 610) and the fan coil circuit 700 may be connected only to the water circuit SH of the refrigerant water heat exchange unit 300.
In addition, in embodiments 1 to 4, the dehumidification heat exchanger 210 is provided on the upstream side of the heating heat exchanger 220 in the air flow path formed by the indoor air blowing device 230 to heat the air and then dehumidify the air, but the present invention is not limited to this, and the dehumidification heat exchanger may be provided on the downstream side of the heating heat exchanger in the air flow path formed by the indoor air blowing device to heat the air and then dehumidify the air. In addition, the dehumidification heat exchanger and the heating heat exchanger may be arranged side by side in a flow path of air formed by the indoor air-sending device, and may dehumidify a part of the air and heat the other part of the air. The heat exchanger is not limited to being disposed in the air flow path formed by the indoor air blowing device, and for example, heat exchange may be performed by a water circulation device, specifically, a water circulation pipe for exchanging heat with the heat exchanger is provided around the heat exchanger and/or the heating heat exchanger, and heat or cold is sent into the room by circulating water circulating through the pipe.
In addition, in embodiments 1 to 4 described above, the outdoor unit 100 includes the valve V11, but the present invention is not limited to this, and the valve V11 may be omitted.
In embodiments 1 to 4, the refrigerant water heat exchange unit 300 includes the valve V32, but the present invention is not limited thereto, and the valve V32 may be omitted.
In embodiments 1 to 4, an electric valve or an electromagnetic valve may be used as the throttle device T1 in addition to the capillary tube.
In addition, in embodiments 2 to 4 described above, the four-way switching valve VF2 as the second switching device and the four-way switching valve VF3 as the third switching device are provided in the outdoor unit of the air conditioning system, and the structure of the air conditioning system is made compact, which contributes to downsizing, but the invention is not limited thereto, and the four-way switching valves VF2 and VF3 may be provided between the outdoor unit and the dehumidifying and heating indoor unit.
In embodiments 1 to 4, the four-way switching valves VF1, VF2, and VF3 are used as the first switching device, the second switching device, and the third switching device, but the present invention is not limited to this, and a three-way valve may be used instead of the four-way switching valves VF1, VF2, and VF 3. In this case, the branch pipes P102, P103, and P106 and the expansion devices T1, T2, and T3 in embodiments 1 to 4 may be omitted.
In embodiment 3 and embodiment 4, two indoor units, i.e., the indoor unit 400A and the indoor unit 400B, are connected in parallel to the first connection pipe P1 and the second connection pipe P2, but the present invention is not limited thereto, and only one indoor unit may be connected to the first connection pipe P1 and the second connection pipe P2, or three or more indoor units may be connected in parallel.
In addition, although the indoor units 400A and 400B have the same configuration in the above embodiments 3 and 4, the present invention is not limited to this, and the configurations of the indoor units 400A and 400B may be different.
In embodiment 4, two outdoor units, that is, the outdoor unit 100A and the outdoor unit 100B, are provided, but the present invention is not limited to this and three or more outdoor units may be provided.
In embodiment 4, the outdoor unit 100A and the outdoor unit 100B have the same configuration, but the present invention is not limited thereto, and the configurations of the outdoor unit 100A and the outdoor unit 100B may be different.
Further, in embodiments 1 to 4, the liquid reservoir 130 is provided in the middle of the suction pipe Pi, but the present invention is not limited thereto, and the liquid reservoir 130 may be omitted.
In addition, although not shown, in the above embodiments 1 to 4, a branching pipe member, such as a Y-shaped adaptor, may be used as the branching pipe in the circuit, or the branching pipe may be directly punched in the pipe and welded.
In addition, the structures shown in fig. 1, 5, and 7 to 11 may be combined with each other or some of the constituent components may be deleted without contradiction.
Claims (35)
1. An air conditioning system (1, 1A, 1B, 1C) comprising an outdoor unit (100) and a dehumidifying and heating indoor unit (200) connected to each other via connecting pipes (P1, P2, P3),
in the outdoor unit (100), a discharge side of a compressor (110) is connected to one end of a discharge pipe (Po), the other end of the discharge pipe (Po) is connectable to one end of a first connection pipe (P1) among the connection pipes (P1, P2, P3), a suction side of the compressor (110) is connected to one end of a suction pipe (Pi), one end of a second connection pipe (P2) among the connection pipes (P1, P2, P3) is connected to a midway of the suction pipe (Pi), an outdoor side heat exchanger (120) is provided midway of a portion of the first connection pipe (P1) located in the outdoor unit (100),
in the dehumidifying and heating indoor unit (200), a first indoor-side refrigerant regulator (V21) and a first heat exchanger (210) are provided in this order from one end of a first indoor-side pipe (P201) in the middle of the first indoor-side pipe, one end of the first indoor-side pipe (P201) is connected to a portion of the first connection pipe (P1) located outside the outdoor unit (100), and the other end of the first indoor-side pipe (P201) is connected to a portion of the second connection pipe (P2) located outside the outdoor unit (100),
the dehumidification heating indoor unit (200) is also provided with a heat circulating device (230) for sending the heat or cold of the dehumidification heating indoor unit into the room,
it is characterized in that the preparation method is characterized in that,
the connection piping (P1, P2, P3) further includes a third connection piping (P3) having one end connected to a middle portion of the discharge pipe (Po),
in the dehumidifying and heating indoor unit (200), a second indoor-side refrigerant regulator (V22) and a second heat exchanger (220) are provided in this order from one end of a second indoor-side pipe (P202) midway in the indoor-side pipe, one end of the second indoor-side pipe (P202) is connected to the first indoor-side pipe (P201) and is positioned between the first indoor-side refrigerant regulator (V21) and one end of the first indoor-side pipe (P201), and the other end of the second indoor-side pipe (P2) is connected to a portion of the third connecting pipe (P3) that is positioned outside the outdoor unit (100),
the air conditioning system further includes a refrigerant water heat exchange unit (300) including a refrigerant pipe (P301), a water circuit (SH) including a water pipe (P302), and a refrigerant water heat exchanger (310) that exchanges heat between the refrigerant flowing through the refrigerant pipe (P301) and the water flowing through the water pipe (P302), one end of the refrigerant pipe (P301) being connected to a portion of the first connection pipe (P1) located outside the outdoor unit (100), the other end of the refrigerant pipe (P301) being connected to a portion of the third connection pipe (P3) located outside the outdoor unit (100),
the air conditioning system further includes:
a first switching device (VF1) that is switchable between a first switching state and a second switching state, wherein the discharge pipe (Po) communicates with the first connection pipe (P1) in the first switching state of the first switching device (VF1), and the first connection pipe (P1) communicates with the suction pipe (Pi) in the second switching state of the first switching device (VF 1); and
and a second switching device (VF2) that is switchable between a first switching state and a second switching state, wherein the second connection pipe (P2) communicates with the suction pipe (Pi) in the first switching state of the second switching device (VF2), and wherein the second connection pipe (P2) communicates with the third connection pipe (P3) in the second switching state of the second switching device (VF 2).
2. The air conditioning system of claim 1,
a branch pipe (P105) having one end connected to the suction pipe (Pi) is further provided in the outdoor unit (100),
the third connecting pipe (P3) includes a first portion (P3-1) and a second portion (P3-2), the first portion (P3-1) is connected to the discharge pipe (Po), the second portion (P3-2) is connected to the second indoor side pipe (P202) and the refrigerant pipe (P301),
the air conditioning system further includes a third switching device (VF3) that is switchable between a first switching state and a second switching state, wherein in the first switching state of the third switching device (VF3), a second portion (P3-2) of the third connection piping (P3) communicates with a first portion (P3-1) of the third connection piping (P3), and in the second switching state of the third switching device (VF3), a second portion (P3-2) of the third connection piping (P3) communicates with the other end of the branch pipe (P105).
3. The air conditioning system of claim 1,
the first indoor-side refrigerant adjusting device (V21) and the second indoor-side refrigerant adjusting device (V22) are electric valves or electromagnetic valves.
4. The air conditioning system of claim 1,
the heat cycle device is an indoor air supply device (230), and the first heat exchanger (210) and the second heat exchanger (220) are provided in a flow path of an air flow formed by the indoor air supply device (230).
5. The air conditioning system as claimed in claim 4,
the first heat exchanger (210) is provided on the upstream side or the downstream side of the second heat exchanger (220) on the flow path,
or,
the first heat exchanger (210) and the second heat exchanger (220) are arranged side by side in the flow path.
6. The air conditioning system of claim 1,
a liquid storage device (130) is provided in the middle of the suction pipe (Pi).
7. The air conditioning system of claim 1,
the air conditioning system further comprises a floor heating water loop (500), and the floor heating water loop (500) is connected to the water loop (SH).
8. The air conditioning system as claimed in claim 7,
the air conditioning system further comprises a water tank (SX),
a domestic water pipe (P602) connected with a domestic water terminal (610) is arranged on the water tank (SX),
the water piping (P302) constituting the water circuit (SH) passes through the water tank (SX).
9. The air conditioning system of claim 8,
the water tank (SX) is provided with an electric heating device.
10. The air conditioning system as claimed in claim 7,
the air conditioning system further comprises a fan coil circuit (700), the fan coil circuit (700) being connected to the water circuit (SH).
11. The air conditioning system of claim 1,
the air conditioning system further comprises a subcooling pipe (P107), a refrigerant adjusting device (V12) and a subcooler (150),
one end of the subcooling pipe (P107) is connected to the first connecting pipe (P1) at a position closer to the other end of the first connecting pipe (P1) than the outdoor heat exchanger (120), the other end of the subcooling pipe (P107) is connected to the suction pipe (Pi),
the refrigerant adjusting device (V12) is arranged in the middle of the supercooling pipe (P107),
the subcooler (150) exchanges heat between the refrigerant flowing through the first connection pipe (P1) and the refrigerant flowing through the refrigerant regulator (V12) through the subcooling pipe (P107).
12. Air conditioning system according to one of claims 1 to 11,
the air conditioning system further includes at least one indoor unit (400A, 400B) including indoor-unit-side refrigerant pipes (P401A, P401B), one end of each of the indoor-unit-side refrigerant pipes (P401A, P401B) being connected to a portion of the first connection pipe (P1) that is located outside the outdoor unit (100), the other end of each of the indoor-unit-side refrigerant pipes (P401A, P401B) being connected to a portion of the second connection pipe (P2) that is located outside the outdoor unit (100), and an indoor-unit-side refrigerant adjusting device (V41A, V41B) and an indoor-unit-side heat exchanger (410A, 410B) being provided in this order from the one end of the indoor-unit-side refrigerant pipe (P401A, P401B) in the middle of the indoor-unit-side refrigerant pipe (P401A, P401B).
13. Air conditioning system according to one of claims 1 to 11,
the air conditioning system includes a plurality of the outdoor units (100A, 100B),
outdoor unit connection piping sections (P1A, P1B) of the first connection piping (P1) connected to the plurality of outdoor units (100A, 100B) merge outside the outdoor units (100A, 100B) to a main connection piping section (P1T) of the first connection piping (P1), one end of the first indoor side piping (P201) and one end of the refrigerant piping (P310) of the refrigerant water heat exchange unit (300) are connected to the main connection piping section (P1T) of the first connection piping (P1),
outdoor unit connection piping segments (P2A, P2B) of the second connection piping (P2) connected to the plurality of outdoor units (100A, 100B) merge outside the outdoor units (100A, 100B) to a main connection piping segment (P2T) of the second connection piping (P2), and the other end of the first indoor side piping (P201) is connected to a main connection piping segment (P2T) of the second connection piping (P2),
outdoor unit connection piping segments (P3A, P3B) of the third connection piping (P3) connected to the plurality of outdoor units (100A, 100B) converge to a main connection piping segment (P3T) of the third connection piping (P3) outside the outdoor units (100A, 100B), and the other end of the second indoor side piping (P202) and the other end of the refrigerant piping (P301) are connected to a main connection piping segment (P3T) of the third connection piping (P3).
14. The air conditioning system of claim 2,
the first switching device (VF1), the second switching device (VF2), and the third switching device (VF3) are four-way valves.
15. The air conditioning system of claim 2,
the second switching device (VF2) and the third switching device (VF3) are provided in the outdoor unit (100).
16. The air conditioning system of claim 2,
the first indoor-side refrigerant adjusting device (V21) and the second indoor-side refrigerant adjusting device (V22) are electric valves or electromagnetic valves.
17. The air conditioning system of claim 2,
the heat cycle device is an indoor air supply device (230), and the first heat exchanger (210) and the second heat exchanger (220) are provided in a flow path of an air flow formed by the indoor air supply device (230).
18. The air conditioning system of claim 17,
the first heat exchanger (210) is provided on the upstream side or the downstream side of the second heat exchanger (220) on the flow path,
or,
the first heat exchanger (210) and the second heat exchanger (220) are arranged side by side in the flow path.
19. The air conditioning system of claim 2,
a liquid storage device (130) is provided in the middle of the suction pipe (Pi).
20. The air conditioning system of claim 2,
the air conditioning system further comprises a floor heating water loop (500), and the floor heating water loop (500) is connected to the water loop (SH).
21. The air conditioning system of claim 20,
the air conditioning system further comprises a water tank (SX),
a domestic water pipe (P602) connected with a domestic water terminal (610) is arranged on the water tank (SX),
the water piping (P302) constituting the water circuit (SH) passes through the water tank (SX).
22. The air conditioning system of claim 21,
the water tank (SX) is provided with an electric heating device.
23. The air conditioning system of claim 20,
the air conditioning system further comprises a fan coil circuit (700), the fan coil circuit (700) being connected to the water circuit (SH).
24. The air conditioning system of claim 2,
the air conditioning system further comprises a subcooling pipe (P107), a refrigerant adjusting device (V12) and a subcooler (150),
one end of the subcooling pipe (P107) is connected to the first connecting pipe (P1) at a position closer to the other end of the first connecting pipe (P1) than the outdoor heat exchanger (120), the other end of the subcooling pipe (P107) is connected to the suction pipe (Pi),
the refrigerant adjusting device (V12) is arranged in the middle of the supercooling pipe (P107),
the subcooler (150) exchanges heat between the refrigerant flowing through the first connection pipe (P1) and the refrigerant flowing through the refrigerant regulator (V12) through the subcooling pipe (P107).
25. Air conditioning system according to one of the claims 14 to 24,
the air conditioning system further includes at least one indoor unit (400A, 400B) including an indoor-unit-side refrigerant pipe (P401A, P401B), one end of the indoor-unit-side refrigerant pipe (P401A, P401B) being connected to a portion of the first connection pipe (P1) that is located outside the outdoor unit (100), the other end of the indoor-unit-side refrigerant pipe (P401A, P401B) being connected to a portion of the second connection pipe (P2) that is located outside the outdoor unit (100), and an indoor-unit-side refrigerant conditioning device (V41A, V41B) and an indoor-unit-side heat exchanger (410A, 410B) being provided in this order from the one end of the indoor-unit-side refrigerant pipe (P401A, P401B) in the middle of the indoor-unit-side refrigerant pipe (P401A, P401B).
26. Air conditioning system according to one of the claims 14 to 24,
the air conditioning system includes a plurality of the outdoor units (100A, 100B),
outdoor unit connection piping sections (P1A, P1B) of the first connection piping (P1) connected to the plurality of outdoor units (100A, 100B) merge outside the outdoor units (100A, 100B) to a main connection piping section (P1T) of the first connection piping (P1), one end of the first indoor side piping (P201) and one end of the refrigerant piping (P310) of the refrigerant water heat exchange unit (300) are connected to the main connection piping section (P1T) of the first connection piping (P1),
outdoor unit connection piping segments (P2A, P2B) of the second connection piping (P2) connected to the plurality of outdoor units (100A, 100B) merge outside the outdoor units (100A, 100B) to a main connection piping segment (P2T) of the second connection piping (P2), and the other end of the first indoor side piping (P201) is connected to a main connection piping segment (P2T) of the second connection piping (P2),
outdoor unit connection piping segments (P3A, P3B) of the third connection piping (P3) connected to the plurality of outdoor units (100A, 100B) converge to a main connection piping segment (P3T) of the third connection piping (P3) outside the outdoor units (100A, 100B), and the other end of the second indoor side piping (P202) and the other end of the refrigerant piping (P301) are connected to a main connection piping segment (P3T) of the third connection piping (P3).
27. Air conditioning system according to one of claims 1 to 11, 14 to 24,
a refrigerant water heat exchange unit side refrigerant conditioning device (V31) is provided between one end of the refrigerant pipe (P301) and the refrigerant water heat exchanger (310).
28. The air conditioning system as claimed in claim 27,
the refrigerant water heat exchange unit side refrigerant adjusting device (V31) is an electric valve or an electromagnetic valve.
29. The air conditioning system as claimed in claim 28,
an electromagnetic valve (V32) is provided between the other end of the refrigerant pipe (P301) and the refrigerant water heat exchanger (310).
30. A control method of an air conditioning system for controlling the air conditioning system according to any one of claims 2 and 14 to 26,
the air conditioning system is switched and operated among a first mode, a second mode, a third mode, a fourth mode and a fifth mode by using a control unit,
in the first mode, the first switching device (VF1) is switched to a second switching state, the second switching device (VF2) is switched to a second switching state, and the third switching device (VF3) is switched to a first switching state, and the first indoor-side refrigerant conditioning device (V21) and the second indoor-side refrigerant conditioning device (V22) are opened,
in the second mode, the first switching device (VF1) is switched to a first switching state, the second switching device (VF2) is switched to a first switching state, and the third switching device (VF3) is switched to a first switching state, and the first indoor-side refrigerant conditioning device (V21) and the second indoor-side refrigerant conditioning device (V22) are opened,
in the third mode, the first switching device (VF1) is switched to the second switching state, the second switching device (VF2) is switched to the first switching state, and the third switching device (VF3) is switched to the first switching state, and the first indoor-side refrigerant conditioning device (V21) is closed, the second indoor-side refrigerant conditioning device (V22) is slightly opened,
in the fourth mode, the first switching device (VF1) is switched to the second switching state, the second switching device (VF2) is switched to the first switching state, and the third switching device (VF3) is switched to the first switching state, and the first indoor-side refrigerant conditioning device (V21) is opened to slightly open the second indoor-side refrigerant conditioning device (V22),
in the fifth mode, the first switching device (VF1) is switched into a first switching state, the second switching device (VF2) is switched into a first switching state, and the third switching device (VF3) is switched into a second switching state.
31. The control method of an air conditioning system as claimed in claim 30,
and in the second mode, the air conditioning system is enabled to perform defrosting operation.
32. The control method of an air conditioning system as claimed in claim 30,
a refrigerant water heat exchange unit side refrigerant conditioning device is provided between one end of the refrigerant pipe and the refrigerant water heat exchanger,
the air conditioning system can be switched to the sixth mode to operate by the control unit,
in the sixth mode, the first switching device (VF1) is switched to a first switching state, the second switching device (VF2) is switched to a first switching state, the third switching device (VF3) is switched to a second switching state, and the first indoor-side refrigerant conditioning device (V21) and the second indoor-side refrigerant conditioning device (V22) are opened, and the refrigerant-water heat exchange unit-side refrigerant conditioning device (V31) is closed.
33. The control method of an air conditioning system as claimed in claim 32,
in the sixth mode, the heat cycle device is stopped or operated at a low speed to perform a defrosting operation.
34. The control method of an air conditioning system as claimed in claim 30,
in the fifth mode, the first indoor side refrigerant regulation device (V21) and the second indoor side refrigerant regulation device (V22) are opened.
35. The control method of an air conditioning system as claimed in claim 30,
in the fifth mode, the first indoor-side refrigerant conditioning device (V21) and the second indoor-side refrigerant conditioning device (V22) are slightly opened.
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| CN201510161541.7A CN106152332B (en) | 2015-04-07 | 2015-04-07 | Air conditioning system and control method thereof |
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| CN201510161541.7A CN106152332B (en) | 2015-04-07 | 2015-04-07 | Air conditioning system and control method thereof |
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| CN106152332B (en) | 2020-07-07 |
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