CN112178758A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN112178758A CN112178758A CN202010981608.2A CN202010981608A CN112178758A CN 112178758 A CN112178758 A CN 112178758A CN 202010981608 A CN202010981608 A CN 202010981608A CN 112178758 A CN112178758 A CN 112178758A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007791 dehumidification Methods 0.000 claims abstract description 73
- 239000003507 refrigerant Substances 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 15
- 238000004378 air conditioning Methods 0.000 abstract description 41
- 230000008569 process Effects 0.000 abstract description 7
- 238000005057 refrigeration Methods 0.000 description 17
- 230000000694 effects Effects 0.000 description 10
- 238000009833 condensation Methods 0.000 description 8
- 230000005494 condensation Effects 0.000 description 8
- 238000005485 electric heating Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/14—Heat exchangers specially adapted for separate outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioner and a control method thereof, wherein the air conditioner comprises a compressor, an indoor heat exchanger and an outdoor heat exchanger, a first throttling device is arranged between the outdoor heat exchanger and the indoor heat exchanger, the outdoor heat exchanger comprises a first outdoor heat exchange section and a second outdoor heat exchange section, and the first outdoor heat exchange section and the second outdoor heat exchange section are arranged in series; the air conditioner also comprises a short-circuit device which can carry out short-circuit or short-circuit removal on the second outdoor heat exchange section; the indoor heat exchanger comprises a first indoor heat exchange section and a second indoor heat exchange section, the first indoor heat exchange section and the second indoor heat exchange section are arranged in series, and a second throttling device is further arranged between the first indoor heat exchange section and the second indoor heat exchange section. According to the invention, the on-way flowing and heat loss of the refrigerant in the outdoor heat exchanger are reduced, the system power consumption is reduced, the energy efficiency of the air conditioning system is effectively improved, more energy is saved, and the problem that the indoor temperature is lowered and uncomfortable in the dehumidification process of the air conditioning system is solved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.
Background
Indoor temperature and humidity are important factors affecting the comfort of human living environment. The air conditioning system can refrigerate and heat to adjust the indoor temperature, and the air conditioner also has a dehumidification mode, but the dehumidification mode of the traditional air conditioner is as follows: the refrigerant in the air conditioning system is in a state of refrigerating cycle operation for indoor, namely the indoor heat exchanger absorbs heat for evaporation refrigeration, and when the temperature of air passing through the indoor heat exchanger of the air conditioner is reduced to dew point temperature, water can be precipitated and condensed from the air, so that the dehumidification effect is achieved, and the change of the indoor temperature is reduced by reducing the indoor temperature or starting electric heating.
The dehumidification mode of the conventional air conditioner has problems:
because the traditional air conditioning system is used for refrigeration and dehumidification, the indoor temperature can be operated only under certain conditions (such as 16-30 ℃), if the temperature exceeds the range, the compressor is stopped, and the refrigeration and dehumidification can not be operated normally. In humid weather in spring and winter, the dehumidification mode of the conventional air conditioner may not work normally.
Since the conventional air conditioning system performs cooling and dehumidification, the indoor temperature is lowered when the temperature is required to be lower than the dew point temperature of air in the dehumidification mode, or the electric heating is turned on to avoid the lowering of the room temperature. Therefore, the traditional air conditioning system is not energy-saving due to refrigeration and dehumidification; when wet weather is saved in spring and winter, the indoor temperature is further reduced due to the fact that the temperature in seasons is low, and comfort experience of people is affected.
In the prior published patent technology CN105352042B, a constant temperature dehumidification air conditioner indoor unit is disclosed, in which a first heat exchanger is provided for receiving low temperature refrigerant during constant temperature dehumidification to perform evaporation refrigeration, and indoor air is cooled and dehumidified; the second heat exchanger is used for receiving high-temperature refrigerants to condense and heat, so that the low-temperature dry air flowing through the first heat exchanger is heated to the room temperature through the second heat exchanger. The purpose of constant temperature dehumidification can be achieved, the indoor temperature is not changed greatly during dehumidification operation, and compared with the dehumidification mode of the traditional air conditioner, the dehumidification method has the advantages of improved comfort and certain technical progress. However, the drawbacks of the prior art CN105352042B are: when dehumidification at constant temperature, high temperature high pressure refrigerant gas passes through outdoor heat exchanger condensation cooling, makes the system heat discharge great to outdoor side, leads to the intensification of second heat exchanger not enough, and constant temperature effect is relatively poor during the dehumidification. Meanwhile, as the refrigerant in the air conditioning system circulates through the outdoor heat exchanger, the on-way flow loss and heat loss increase the system power, and the energy is not saved enough.
Because the problems that in the prior art, when dehumidification is performed, a refrigerant circularly flows through an outdoor heat exchanger, the system power is increased due to flow along the way and heat loss, the energy efficiency is low and the like exist in an air conditioning system, the air conditioner and the control method thereof are researched and designed.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defects that in the prior art, when dehumidification is performed, a refrigerant circulates through an outdoor heat exchanger, and the refrigerant flows along the way and is subjected to heat loss, so that the system power is increased, and the energy efficiency is low, so as to provide an air conditioner and a control method thereof.
In order to solve the above problems, the present invention provides an air conditioner, which includes a compressor, an indoor heat exchanger and an outdoor heat exchanger, wherein a first throttling device is disposed between the outdoor heat exchanger and the indoor heat exchanger, the outdoor heat exchanger includes a first outdoor heat exchange section and a second outdoor heat exchange section, and the first outdoor heat exchange section and the second outdoor heat exchange section are disposed in series; the air conditioner also comprises a short-circuit device which can carry out short-circuit or short-circuit removal on the second outdoor heat exchange section;
the indoor heat exchanger comprises a first indoor heat exchange section and a second indoor heat exchange section, the first indoor heat exchange section and the second indoor heat exchange section are arranged in series, and a second throttling device is further arranged between the first indoor heat exchange section and the second indoor heat exchange section.
Preferably, the short-circuit device includes a first branch and a control valve disposed on the first branch, one end of the first branch is communicated with a pipeline between the first outdoor heat exchange section and the second outdoor heat exchange section, and the other end of the first branch is communicated with a pipeline between the second outdoor heat exchange section and the first throttle device.
Preferably, the air conditioner further comprises an outdoor fan, the outdoor fan can radiate the heat of the outdoor heat exchanger, and the outdoor fan can drive airflow to exchange heat through the second outdoor heat exchange section and/or the first outdoor heat exchange section.
Preferably, the air conditioner further comprises an indoor fan, and the indoor fan can radiate heat of the indoor heat exchanger;
the indoor fan can drive airflow to firstly exchange heat through the second indoor heat exchange section and then exchange heat through the first indoor heat exchange section; alternatively, the first and second electrodes may be,
the indoor fan can drive a first part of air flow to exchange heat through the first indoor heat exchange section, the indoor fan can drive a second part of air flow to exchange heat through the second indoor heat exchange section, and the first part of air flow after heat exchange through the first indoor heat exchange section is mixed with the second part of air flow after heat exchange through the second indoor heat exchange section.
Preferably, the first indoor heat exchange section has a tube inner diameter of d1, the second indoor heat exchange section has a tube inner diameter of d2, and d1 ≠ d2, when the system is in dehumidification mode, and when the refrigerant flow direction is: d1< d2 from the first indoor heat exchange section to the second throttle device to the second indoor heat exchange section; when the refrigerant flow direction is: from the second indoor heat exchange section to the second throttle means to the first indoor heat exchange section, d1> d 2.
Preferably, the air conditioner further comprises a controller and a four-way valve, and when the air conditioner simultaneously comprises a control valve, an outdoor fan and an indoor fan: the controller is respectively electrically connected with the four-way valve, the first throttling device, the second throttling device, the control valve, the outdoor fan and the indoor fan and is in signal connection with the indoor fan.
Preferably, the control valve comprises a two-way valve or a one-way valve.
The present invention also provides a control method of an air conditioner as set forth in any one of the above, wherein:
when the air conditioner needs to operate in a cooling or heating mode, controlling the short-circuit device to enable the second outdoor heat exchange section to be communicated with the first outdoor heat exchange section, and enabling refrigerant to flow through the second outdoor heat exchange section and the first outdoor heat exchange section;
when the air conditioner needs to operate in the dehumidification mode, the short-circuit device is controlled to enable the second outdoor heat exchange section to be short-circuited, and the refrigerant only flows through the first outdoor heat exchange section.
Preferably, when the air conditioner needs to operate in a cooling or heating mode, and when the short-circuit device comprises a first branch and a control valve arranged on the first branch, the control valve is controlled to disconnect the first branch;
when the air conditioner needs to operate in a dehumidification mode, and when the short-circuit device comprises a first branch and a control valve arranged on the first branch, the control valve is controlled to be connected with the first branch.
Preferably, when the air conditioner needs to operate in a cooling or heating mode, the first throttling device is controlled to be partially opened to perform effective throttling, and the second throttling device is controlled to have the maximum opening degree and not to be throttled;
when the air conditioner needs to operate in a dehumidification mode, the opening degree of the first throttling device is controlled to be the maximum, throttling is not performed, and the second throttling device is controlled to be partially opened to perform effective throttling.
The air conditioner and the control method thereof provided by the invention have the following beneficial effects:
the invention can effectively carry out short circuit on the second outdoor heat exchange section by setting the outdoor heat exchanger into a structure comprising two heat exchange sections and setting the short circuit device in the air conditioner, sets the indoor heat exchanger into a structure comprising two heat exchange sections, sets the second throttling device between the two indoor heat exchange sections, can lead one indoor heat exchange section to carry out refrigeration and the other indoor heat exchange section to carry out refrigeration or heating, can effectively form normal refrigeration or normal constant temperature dehumidification indoors, keeps the indoor environment temperature unchanged or not to be reduced too much, and controls the short circuit device to carry out short circuit on the second outdoor heat exchange section in the dehumidification mode, thereby effectively reducing the heat emitted from the outdoor heat exchanger to the outside, and transfers the partial condensation heat release to the first indoor heat exchange section to effectively heat the inside of the room, the constant-temperature dehumidification requirement is met, the problems that the power of the system is increased due to the fact that the refrigerant circularly flows through the outdoor heat exchanger or the electric heating assistance is required to be started in the dehumidification process, the power consumption is increased due to the fact that the refrigerant flows along the way and the heat loss, and the energy is not saved are effectively solved, the flow along the way and the heat loss of the refrigerant in the outdoor heat exchanger are reduced, the power consumption of the system is reduced, the energy efficiency of an air conditioning system is effectively improved, and the energy is saved; the indoor temperature of the air conditioning system is kept unchanged in the dehumidification process, the air conditioning system is more comfortable and more energy-saving compared with the prior art, and the problem that the indoor temperature of the air conditioning system is lowered and uncomfortable in the dehumidification process is solved.
Drawings
Fig. 1 is a system diagram of an air conditioner having a constant temperature dehumidification function according to the present invention;
fig. 2 is a schematic structural view of an outdoor heat exchanger of an air conditioner of the present invention;
fig. 3 is a schematic structural view of a control system of an air conditioner of the present invention;
FIG. 4 is a schematic view illustrating a constant temperature dehumidification principle of the air conditioner with a constant temperature dehumidification function according to the present invention;
FIG. 5 is a system diagram of an alternative embodiment 1 of the air conditioner with constant temperature dehumidification function of the present invention;
FIG. 6 is a system diagram of an alternative embodiment 2 of the air conditioner with constant temperature dehumidification function of the present invention;
fig. 7 is a schematic structural view of two alternative embodiments of the outdoor heat exchanger of the air conditioner of the present invention;
fig. 8 is a system pressure-enthalpy diagram of the air conditioner with constant temperature dehumidification function of the present invention.
The reference numerals are represented as:
1. an indoor heat exchanger; 100. a first branch; 101. a first indoor heat exchange section; 102. a second indoor heat exchange section; 103. a second throttling device; 2. an outdoor heat exchanger; 201. a first outdoor heat exchange section; 202. a second outdoor heat exchange section; 203. a control valve; 203a, a two-way valve; 203b, a one-way valve; 3. a first throttling device; 4. a four-way valve; 5. a compressor; 6. an indoor fan; 7. an outdoor fan; 8. and a controller.
Detailed Description
As shown in fig. 1 to 8, the present invention provides an air conditioner, which includes a compressor 5, an indoor heat exchanger 1 and an outdoor heat exchanger 2, wherein a first throttling device 3 is disposed between the outdoor heat exchanger 2 and the indoor heat exchanger 1, the outdoor heat exchanger 2 includes a first outdoor heat exchange section 201 and a second outdoor heat exchange section 202, and the first outdoor heat exchange section 201 and the second outdoor heat exchange section 202 are disposed in series; the air conditioner further comprises a short-circuiting device capable of short-circuiting or short-circuiting removal of the second outdoor heat exchange section 202;
the indoor heat exchanger 1 comprises a first indoor heat exchange section 101 and a second indoor heat exchange section 102, the first indoor heat exchange section 101 and the second indoor heat exchange section 102 are arranged in series, and a second throttling device 103 is further arranged between the first indoor heat exchange section 101 and the second indoor heat exchange section 102.
The invention can effectively carry out short circuit on the second outdoor heat exchange section by setting the outdoor heat exchanger into a structure comprising two heat exchange sections and setting the short circuit device in the air conditioner, sets the indoor heat exchanger into a structure comprising two heat exchange sections, sets the second throttling device between the two indoor heat exchange sections, can lead one indoor heat exchange section to carry out refrigeration and the other indoor heat exchange section to carry out refrigeration or heating, can effectively form normal refrigeration or normal constant temperature dehumidification indoors, keeps the indoor environment temperature unchanged or not to be reduced too much, and controls the short circuit device to carry out short circuit on the second outdoor heat exchange section in the dehumidification mode, thereby effectively reducing the heat emitted from the outdoor heat exchanger to the outside, and transfers the partial condensation heat release to the first indoor heat exchange section to effectively heat the inside of the room, the constant-temperature dehumidification requirement is met, the problems that the on-way flow loss (including kinetic energy loss) and heat loss increase system power, the electric heating assistance increases power consumption and energy is not saved due to the fact that the refrigerant circularly flows through the outdoor heat exchanger or the electric heating assistance is needed to be started in the dehumidification process are effectively solved, the on-way flow and heat loss of the refrigerant in the outdoor heat exchanger are reduced, the system power consumption is reduced, the energy efficiency of an air conditioning system is effectively improved, and energy is saved; the indoor temperature of the air conditioning system is kept unchanged in the dehumidification process, the air conditioning system is more comfortable and more energy-saving compared with the prior art, and the problem that the indoor temperature of the air conditioning system is lowered and uncomfortable in the dehumidification process is solved.
The invention relates to a dehumidifying air-conditioning system. The air conditioning system includes: the indoor heat exchanger 1, the outdoor heat exchanger 2, the first throttling gear 3, the four-way valve 4, the compressor 5, the second throttling gear 103, the control valve 203, the indoor fan 6, the outdoor fan 7, the controller 8 and the connecting pipeline.
The outdoor heat exchanger 2 is provided with a first outdoor heat exchange section 201, a second outdoor heat exchange section 202 and a control valve 203. One end of the first outdoor heat exchange section is connected with the four-way valve 4, the other end is connected with one end of the second outdoor heat exchange section, and the second outdoor heat exchange section 202 is connected with the first throttling device 3 after being connected with the control valve 203 in parallel.
Preferably, the short-circuiting device includes a first branch 100 and a control valve 203 disposed on the first branch 100, one end of the first branch 100 is communicated with a pipeline between the first outdoor heat exchange section 201 and the second outdoor heat exchange section 202, and the other end of the first branch 100 is communicated with a pipeline between the second outdoor heat exchange section 202 and the first throttling device 3. The on-off of the first branch can be effectively controlled through the control valve, so that whether the second outdoor heat exchange section is short-circuited or not is effectively controlled, the control valve is closed when the air conditioner operates in a normal heating, refrigerating or ventilating mode, and the like, so that the two outdoor heat exchange sections can normally exchange heat, and the control valve is controlled to open the first branch to short-circuit the second outdoor heat exchange section in a dehumidification mode, so that the heat discharged outwards through the outdoor heat exchanger is effectively reduced, the condensation heat release part of the refrigerant is recycled to the heat release part of the indoor heat exchanger, the condensation heat can be utilized while the constant temperature dehumidification is effectively ensured, the energy utilization rate is improved, and the energy efficiency of the system is improved.
The control valve 203 can be a two-way valve with two states of opening or closing, or a one-way valve (the one-way valve has the functions of forward conduction and reverse cut-off, when the forward conduction is carried out, the air conditioner works for partial load, the air conditioner is in constant temperature dehumidification operation, otherwise, the air conditioner normally cools or heats. When the two-way valve is in an open state, only a small part of the refrigerant flows through the second outdoor heat exchange section, the heat exchange amount and the heat exchange effect are small, and the outdoor heat exchanger works under partial load. When the two-way valve is in a closed state, all the refrigerant flows through the second outdoor heat exchange section, and the heat exchange amount and the heat exchange effect are best, namely the outdoor heat exchange section works in a full load mode. The third valve is a one-way valve, when the refrigerant flows in the forward direction, only a very small part of the refrigerant flows through the second outdoor heat exchange section, the heat exchange amount and the heat exchange effect are very small, and namely the outdoor heat exchanger works under partial load; on the contrary, the outdoor heat exchange section works in full load (when the outdoor heat exchange section flows in the reverse direction, the one-way valve also leaks, and compared with the main flow, the flow is very small, namely the outdoor heat exchange section is closed).
When the constant-temperature dehumidification operation is carried out, the outdoor heat exchanger works in a partial load mode, heat exchange between the air conditioning system and the outdoor side and power loss of the on-way flow system are reduced, energy efficiency is improved, and the heating and warming effects of indoor dehumidification on low-temperature dry air are improved.
Preferably, the air conditioner further comprises an outdoor fan 7, the outdoor fan 7 can radiate heat to the outdoor heat exchanger 2,
the outdoor fan 7 can drive the air flow to exchange heat through the second outdoor heat exchange section 202 and/or through the first outdoor heat exchange section 201.
The outdoor heat exchanger can be effectively heated and exchanged through the outdoor fan, the second outdoor heat exchange section preferably exchanges heat firstly and then exchanges heat through the first outdoor heat exchange section, when the second outdoor heat exchange section is short-circuited, only the first outdoor heat exchange section exchanges heat, and the outdoor fan plays a role in controlling heat dissipation and heat exchange.
Preferably, the air conditioner further comprises an indoor fan 6, and the indoor fan 6 can dissipate heat of the indoor heat exchanger 1;
in alternative embodiment 1, as shown in fig. 5, the indoor fan 6 can drive the airflow to firstly exchange heat through the second indoor heat exchange section 102 and then exchange heat through the first indoor heat exchange section 101; alternatively, the first and second electrodes may be,
in the main embodiment, as shown in fig. 1, the indoor fan 6 can drive a first portion of the airflow to pass through the first indoor heat exchange section 101 for heat exchange, the indoor fan 6 can also drive a second portion of the airflow to pass through the second indoor heat exchange section 102 for heat exchange, and the first portion of the airflow after heat exchange in the first indoor heat exchange section 101 is mixed with the second portion of the airflow after heat exchange in the second indoor heat exchange section 102.
The indoor heat exchanger can be effectively heated and exchanged through the indoor fan, the main embodiment enables two parts of air flows to exchange heat with the first indoor heat exchange section and the second indoor heat exchange section respectively, the first indoor heat exchange section heats air and the second indoor heat exchange section refrigerates air in a dehumidification mode, and then the air flows after heat exchange are mixed and discharged to the indoor space, so that effective constant-temperature dehumidification is completed; alternative embodiment 1 preferably makes the second indoor heat exchange section exchange heat earlier and is cooled and dehumidified, and then passes through the heating of first indoor heat exchange section and keeps the air constant temperature, accomplishes the effect of effectual constant temperature dehumidification.
The air flows through the refrigerating and heating heat exchange section successively in the alternative embodiment 1, the pneumatic resistance is large, and the air quantity is small when the air conditioner operates in an air conditioning mode, so that the refrigerating and heating effects of the air conditioner are influenced. The cavities in the main embodiment respectively flow through the cooling and heating sections and are mixed with the cold and hot air to reach room temperature, so that the influence on cooling and heating operation in an air conditioning mode is small, and the practicability is high in practice.
Preferably, the tube inner diameter of the first indoor heat exchange section 101 is d1, the tube inner diameter of the second indoor heat exchange section 102 is d2, and d1 ≠ d2, when the system is in dehumidification mode, and when the refrigerant flow direction is: from the first indoor heat exchange stage 101 to the second throttling arrangement 103 to the second indoor heat exchange stage 102, d1< d 2; when the refrigerant flow direction is: from the second indoor heat exchange section 102 to the second throttling means 103 to the first indoor heat exchange section 101, d1> d 2.
When the first indoor heat exchange section 101 is in the constant humidity dehumidification operation, the refrigerant is high temperature and high pressure, and the density is large, and the second indoor heat exchange section 102 is low temperature and low pressure, and according to the conservation of mass, m is rho VA, and when the flow rate is fixed, the density is larger, and the required sectional area is smaller. Therefore, if the refrigerant firstly flows through the first indoor heat exchange section, d1 is less than d2, and the flow equalization is effectively ensured.
Preferably, a controller 8 and a four-way valve 4 are further included, and when the control valve 203, the outdoor fan 7 and the indoor fan 6 are included at the same time: the controller 8 is electrically connected and signal-connected with the four-way valve 4, the first throttling device 3, the second throttling device 103, the control valve 203, the outdoor fan 7 and the indoor fan 6 respectively. This is a further preferred configuration of the air conditioner of the present invention, and the four-way valve 4, the first throttle device 3, the second throttle device 103, the control valve 203, the outdoor fan 7, and the indoor fan 6 can be effectively controlled by the controller.
Preferably, the control valve 203 comprises a two-way valve 203a (main embodiment, fig. 2) or a one-way valve 203b (alternative embodiment 1, fig. 7); and/or said second restriction 103 comprises a throttle (main embodiment, fig. 1), or said second restriction comprises a parallel arrangement of a throttle and a non-return valve (alternative embodiment 2, fig. 6).
The indoor heat exchanger 1 of the present invention is provided with a first indoor heat exchange section 101 and a second indoor heat exchange section 102, one end of the first indoor heat exchange section 101 is connected with one end of the second indoor heat exchange section 102 through a second throttling device 103, the other end of the first indoor heat exchange section 101 is connected with a first throttling device 3 of an outdoor unit through a connecting pipe, and the other end of the second indoor heat exchange section 102 is connected with a four-way valve 4 of the outdoor unit through a connecting pipe.
When the opening degree of the second throttling device is maximum, the pressure drop is small, the refrigerant states of the first indoor heat exchange section and the second indoor heat exchange section are the same, namely one of high-temperature high-pressure refrigerant or low-temperature low-pressure refrigerant, and the working state is condensation heat release or evaporation heat absorption respectively. When the opening degree of the second throttling device is smaller, the second throttling device throttles the refrigerant, the refrigerant states of the first indoor heat exchange section and the second indoor heat exchange section are different, namely the first indoor heat exchange section is high-temperature and high-pressure and releases heat indoors, the second indoor heat exchange section is low-temperature and low-pressure and absorbs heat indoors, or vice versa.
The present invention also provides a control method of an air conditioner as set forth in any one of the above, wherein:
when the air conditioner needs to operate in a cooling or heating mode, controlling the short-circuit device to enable the second outdoor heat exchange section 202 to be communicated with the first outdoor heat exchange section 201, and enabling refrigerant to flow through the second outdoor heat exchange section 202 and the first outdoor heat exchange section 201;
when the air conditioner needs to operate in the dehumidification mode, the short-circuiting device is controlled such that the second outdoor heat exchange section 202 is short-circuited and the refrigerant flows through only the first outdoor heat exchange section 201.
The working modes of the air conditioning system are at least as follows: a dehumidification mode and an air-conditioning mode. The dehumidifier operates, namely the indoor heat exchanger at least comprises two parts of air refrigeration, dehumidification and heat exchange and air heating and heat exchange; wherein the air conditioning mode includes cooling, heating, dehumidifying, ventilating, etc. in general.
When the operating mode of the air conditioning system is the dehumidification mode, the controller controls the control valve 203 to be opened, the first throttling device 3 is fully opened (the opening degree is maximum), and the second throttling device 103 is partially opened. Because the third valve is opened, only a small part of the refrigerant flows through the second outdoor heat exchange section, the heat exchange amount and the heat exchange effect are small, and the outdoor heat exchanger works partially under load. The second throttling device is partially opened, the second throttling device throttles the refrigerant, the refrigerant states of the first indoor heat exchange section and the second indoor heat exchange section are different, namely the first indoor heat exchange section is high in temperature and high in pressure and releases heat indoors, and the second indoor heat exchange section is low in temperature and low in pressure and absorbs heat indoors. Or conversely, the first indoor heat exchange section is low-temperature and low-pressure, and the second indoor heat exchange section is high-temperature and high-pressure. The controller controls the four-way valve to make the refrigerant flow path: the air is discharged from the compressor 5 → the four-way valve 4 → the first outdoor heat exchange section 201 → the control valve 203 → the first throttling means 3 → the first indoor heat exchange section 101 → the second throttling means 103 → the second indoor heat exchange section 102 → the four-way valve 4 → the air is sucked by the compressor 5, and a cycle of the dehumidification mode is completed. The first outdoor heat exchange section 201 releases heat to the outdoor space and discharges redundant heat; the first indoor heat exchange section 101 releases heat to the indoor space to heat the indoor air; the second indoor heat exchange section absorbs heat from the indoor space to carry out refrigeration and dehumidification, the dehumidified dry and cold air and the hot air from the first indoor heat exchange section are mixed and then return to the indoor space, as shown in fig. 4, in a dehumidification mode, one part of the indoor air is dehumidified, the other part of the indoor air is heated and heated, the temperature of the mixed air returning to the indoor space is basically unchanged, the constant-temperature dehumidification effect is achieved, and the dehumidifier is equivalent to a dehumidifier.
According to the pressure-enthalpy diagram of the refrigeration cycle, theoretically, the heat release amount of condensation (h2-h4) is larger than the theoretical refrigeration amount (h1-h5), so that the more heat is released from the first outdoor heat exchange section to the outdoor, the lower the temperature rise of the air in the first indoor heat exchange section is, further, the lower the outlet air temperature after mixing at the indoor heat exchange side is, and the comfort is influenced. The third valve is arranged to be connected with the second outdoor heat exchange section in parallel, the outdoor heat exchanger is in a partial load working state, the heat release of the first outdoor heat exchange section is enabled to be about (h2-h6), the heat release of the first indoor heat exchange section is enabled to be about (h6-h4), the heat absorption of the second indoor heat exchange section is enabled to be about (h1-h5), and (h6-h4) is (h1-h5), the condition that the air outlet temperature after the indoor heat exchange side is mixed is equal to the indoor environment is guaranteed, the constant temperature dehumidification effect is achieved, the problem that the cooling and dehumidification indoor temperature of a traditional air conditioning system is poor in comfort, or the problem that energy is not saved due to the fact that electric heating is started in order to avoid the. Meanwhile, the flow loss of the system is reduced, and the air conditioning system is more energy-saving.
Preferably, when the air conditioner needs to operate in a cooling or heating mode, and when the short-circuiting device comprises a first branch 100 and a control valve 203 arranged on the first branch 100, the control valve 203 is controlled to disconnect the first branch 100;
when the air conditioner needs to operate in the dehumidification mode, and when the short-circuiting device comprises the first branch 100 and the control valve 203 arranged on the first branch 100, the control valve 203 is controlled to open the first branch 100.
When the system is in dehumidifier operation, the refrigerant flow path is as follows: from the first indoor heat exchange section 101 → the second throttling device 103 → the second indoor heat exchange section 102, the inner diameter of the first indoor heat exchange section 101 is d1, the inner diameter of the second indoor heat exchange section 102 is d2, preferably, d1< d 2; when the refrigerant flow paths are reversed, d1> d 2. The cost of the indoor heat exchanger can be reduced, and the air conditioning system is more economical.
Preferably, when the air conditioner needs to operate in a cooling or heating mode, the first throttling device 3 is controlled to be partially opened to perform effective throttling, and the second throttling device 103 is controlled to have the maximum opening degree and not to perform throttling;
when the air conditioner needs to operate in a dehumidification mode, the opening degree of the first throttling device 3 is controlled to be maximum, throttling is not performed, and the second throttling device 103 is controlled to be partially opened to perform effective throttling.
When the working mode of the air conditioning system is the air conditioning mode, the controller controls the control valve 203 to be closed, the first throttling device 3 to be partially opened, and the second throttling device 103 to be fully opened (the opening degree is the maximum). The first outdoor heat exchange section is communicated with the second outdoor heat exchange section due to the closing of the third valve, and the outdoor heat exchanger of the air-conditioning system is in a full-load working state; because the second throttling device is fully opened and has small pressure drop, the refrigerant states of the first indoor heat exchange section and the second indoor heat exchange section are the same, namely one of high-temperature high-pressure refrigerant or low-temperature low-pressure refrigerant, and the working state is respectively condensation heat release or evaporation heat absorption. The first throttling device plays a throttling regulation role. At the moment, the air conditioning system enables the air conditioning system to work as the traditional air conditioning system by reversing the four-way valve, and the air conditioning modes including refrigeration, heating, dehumidification, ventilation and the like in common meanings are completed.
1. The invention provides a dehumidifying air conditioner. The system of the air conditioner includes: the system comprises an indoor heat exchanger 1, an outdoor heat exchanger 2, a first throttling device 3, a four-way valve 4, a compressor 5, a second throttling device 103, a control valve 203, an indoor fan 6, an outdoor fan 7, a controller, a connecting pipeline and the like. The outdoor heat exchanger 2 is provided with a control valve 203 which is opened or closed, so that the outdoor heat exchanger has a partial load working state or a full load working state.
The controller controls the indoor fan, the outdoor fan, the four-way valve, the first throttling device, the second throttling device and the control valve when the two-way valve is used. The working mode of the air conditioning system is at least a dehumidification mode and an air conditioning mode.
2. In the dehumidification mode of the air conditioning system, the controller controls the control valve 203 to be opened, the first throttling device 3 is fully opened (the opening degree is maximum), and the second throttling device 103 is partially opened. The indoor side heat exchanger at least comprises two parts of air refrigeration, dehumidification and heat exchange and air heating and heat exchange, and the outdoor heat exchanger is in a partial load working state.
When the air conditioning system works in an air conditioning mode, the controller controls the control valve 203 to be closed, the first throttling device 3 to be partially opened, and the second throttling device 103 to be fully opened (the opening degree is the largest).
3. The outdoor heat exchanger 2 is provided with a first outdoor heat exchange section 201, a second outdoor heat exchange section 202 and a control valve 203. The second outdoor heat exchange section 202 is connected in parallel with a control valve 203, and the control valve 203 may be a two-way valve with two states of opening or closing, or a one-way valve.
4. The indoor heat exchanger 1 is provided with a first indoor heat exchange section 101 and a second indoor heat exchange section 102, and one end of the first indoor heat exchange section 101 is connected with one end of the second indoor heat exchange section 102 through a second throttling device 103.
5. The inner diameter of the first indoor heat exchange section 101 is d1, the inner diameter of the second indoor heat exchange section 102 is d2, d1 is not equal to d2, and when the system is in dehumidifier operation, the refrigerant flow path is as follows: from the first indoor heat exchange section 101 → the second throttling means 103 → the second indoor heat exchange section 103, preferably, d1< d 2; conversely, d1> d 2.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (10)
1. An air conditioner, characterized in that:
the heat exchanger comprises a compressor (5), an indoor heat exchanger (1) and an outdoor heat exchanger (2), wherein a first throttling device (3) is arranged between the outdoor heat exchanger (2) and the indoor heat exchanger (1), the outdoor heat exchanger (2) comprises a first outdoor heat exchange section (201) and a second outdoor heat exchange section (202), and the first outdoor heat exchange section (201) and the second outdoor heat exchange section (202) are arranged in series; the air conditioner further comprises a short-circuiting device capable of short-circuiting or short-circuiting the second outdoor heat exchange section (202);
indoor heat exchanger (1) includes first indoor heat transfer section (101) and the indoor heat transfer section of second (102), first indoor heat transfer section (101) with the setting of establishing ties of the indoor heat transfer section of second (102), and first indoor heat transfer section (101) with still be provided with second throttling arrangement (103) between the indoor heat transfer section of second (102).
2. The air conditioner according to claim 1, wherein:
the short-circuiting device comprises a first branch (100) and a control valve (203) arranged on the first branch (100), one end of the first branch (100) is communicated with a pipeline between the first outdoor heat exchange section (201) and the second outdoor heat exchange section (202), and the other end of the first branch (100) is communicated with a pipeline between the second outdoor heat exchange section (202) and the first throttling device (3).
3. The air conditioner according to claim 1 or 2, wherein:
the air conditioner also comprises an outdoor fan (7), the outdoor fan (7) can radiate heat of the outdoor heat exchanger (2),
the outdoor fan (7) can drive airflow to pass through the second outdoor heat exchange section (202) for heat exchange and/or pass through the first outdoor heat exchange section (201) for heat exchange.
4. The air conditioner according to any one of claims 1 to 3, wherein:
the air conditioner also comprises an indoor fan (6), wherein the indoor fan (6) can radiate the heat of the indoor heat exchanger (1);
the indoor fan (6) can drive airflow to firstly pass through the second indoor heat exchange section (102) for heat exchange and then pass through the first indoor heat exchange section (101) for heat exchange; alternatively, the first and second electrodes may be,
the indoor fan (6) can drive a first part of airflow to pass through the first indoor heat exchange section (101) for heat exchange, the indoor fan (6) can also drive a second part of airflow to pass through the second indoor heat exchange section (102) for heat exchange, and the first part of airflow after heat exchange through the first indoor heat exchange section (101) is mixed with the second part of airflow after heat exchange through the second indoor heat exchange section (102).
5. The air conditioner according to any one of claims 1 to 4, wherein:
the tube inner diameter of the first indoor heat exchange section (101) is d1, the tube inner diameter of the second indoor heat exchange section (102) is d2, and d1 ≠ d2, when the system is in dehumidification mode, and when the refrigerant flow direction is: from the first indoor heat exchange section (101) to the second throttling arrangement (103) to the second indoor heat exchange section (102), d1< d 2; when the refrigerant flow direction is: from the second indoor heat exchange section (102) to the second throttling arrangement (103) to the first indoor heat exchange section (101), d1> d 2.
6. The air conditioner according to any one of claims 2 to 5, wherein:
still include controller (8) and cross valve (4), when including control valve (203), outdoor fan (7) and indoor fan (6) simultaneously: the controller (8) is respectively electrically connected and in signal connection with the four-way valve (4), the first throttling device (3), the second throttling device (103), the control valve (203), the outdoor fan (7) and the indoor fan (6).
7. The air conditioner according to any one of claims 2 to 6, wherein:
the control valve (203) comprises a two-way valve (203a) or a one-way valve (203 b); and/or the second throttling device (103) comprises a throttling valve or the second throttling device comprises a structure that the throttling valve is connected with a one-way valve in parallel.
8. A control method of an air conditioner according to any one of claims 1 to 7, characterized in that:
when the air conditioner needs to operate in a cooling or heating mode, controlling the short-circuit device to enable the second outdoor heat exchange section (202) to be communicated with the first outdoor heat exchange section (201), and enabling refrigerant to flow through the second outdoor heat exchange section (202) and the first outdoor heat exchange section (201);
when the air conditioner needs to operate in a dehumidification mode, the short-circuiting device is controlled to enable the second outdoor heat exchange section (202) to be short-circuited, and the refrigerant only flows through the first outdoor heat exchange section (201).
9. The control method according to claim 8, characterized in that:
when the air conditioner needs to operate in a cooling or heating mode, and when the short-circuiting device comprises a first branch (100) and a control valve (203) arranged on the first branch (100), controlling the control valve (203) to disconnect the first branch (100);
when the air conditioner needs to operate in a dehumidification mode, and when the short-circuit device comprises a first branch circuit (100) and a control valve (203) arranged on the first branch circuit (100), the control valve (203) is controlled to be communicated with the first branch circuit (100).
10. The control method according to claim 8 or 9, characterized in that:
when the air conditioner needs to operate in a cooling or heating mode, the first throttling device (3) is controlled to be partially opened to perform effective throttling, and the second throttling device (103) is controlled to have the maximum opening degree and not to perform throttling;
when the air conditioner needs to operate in a dehumidification mode, the opening degree of the first throttling device (3) is controlled to be the maximum, throttling is not performed, and the second throttling device (103) is controlled to be partially opened to perform effective throttling.
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