Air conditioning system and control method thereof

Abstract

The application provides an air conditioning system and a control method thereof. The air conditioning system comprises a refrigerant compression cycle, a carrier refrigerant cycle and an intermediate heat exchanger. The refrigerant compression cycle comprises an indoor heat exchanger. The carrier refrigerant cycle comprises an indoor temperature regulating heat exchanger, a solar energy device with a heat collecting pipe, a bypass pipeline and a water pump for driving the carrier refrigerant cycle to flow. The bypass pipeline is connected in parallel with the heat collecting pipe. The carrier refrigerant flow in the bypass pipeline and the heat collecting pipe can exchange heat with the carrier refrigerant in the carrier refrigerant heat exchange pipe and the refrigerant in the refrigerant heat exchange pipe. The carrier refrigerant in the carrier refrigerant overcurrent pipe does not exchange heat with the refrigerant in the refrigerant heat exchange pipe. The carrier refrigerant can be switched between the bypass pipeline and the heat collecting pipe or the flow can be distributed. The indoor temperature regulating heat exchanger can finely adjust the outlet air temperature. The sudden change of the outlet air temperature and the large fluctuation of the room temperature caused by the shielding of part of the operating frequency points of the compressor in the related art are effectively overcome. The comfort of the user is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioning, and particularly relates to an air conditioning system and a control method thereof. BACKGROUND

[0002] Most of the air conditioning equipment on the market has the problem of compressor, unreasonable pipeline design or resonance of each part, which leads to the need to shield part of the operating frequency points of the compressor, so that the air conditioning equipment will appear the situation of sudden change of outlet air temperature in the daily operation process. Even if the compressor shielding frequency point is more, the air conditioning equipment capacity cannot be finely adjusted, which leads to the room temperature fluctuation, affecting the user comfort. SUMMARY

[0003] Therefore, the present application provides an air conditioning system and a control method thereof, which can overcome the technical problem that part of the operating frequency points of the compressor in the air conditioning system is shielded, leading to sudden change of outlet air temperature in the operation process of the air conditioning system, even the air conditioning cannot be finely adjusted, leading to room temperature fluctuation, reducing user comfort.

[0004] In order to solve the above problems, the present application provides an air conditioning system, which comprises a refrigerant compression cycle, a cold carrier cycle and an intermediate heat exchanger. The refrigerant compression cycle comprises an indoor heat exchanger. When the refrigerant compression cycle operates in a refrigeration condition, the refrigerant inlet pipe of the indoor heat exchanger is a first pipe. The cold carrier cycle comprises an indoor temperature regulating heat exchanger, a solar energy device, a bypass pipeline and a water pump for driving the flow of the cold carrier cycle. The indoor temperature regulating heat exchanger is located on the air outlet side of the indoor heat exchanger to regulate the air flow of the indoor heat exchanger. The solar energy device comprises a heat collecting pipe. The bypass pipeline is connected in parallel with the heat collecting pipe. The flow of the cold carrier in the bypass pipeline and the heat collecting pipe can be controlled and adjusted. The cold carrier inlet pipe of the indoor temperature regulating heat exchanger is a second pipe. The intermediate heat exchanger has a refrigerant heat exchange pipe connected in series in the first pipe and a cold carrier heat exchange pipe and a cold carrier overflow pipe which can be selectively connected in series in the second pipe. The cold carrier in the cold carrier heat exchange pipe can exchange heat with the refrigerant in the refrigerant heat exchange pipe. The cold carrier in the cold carrier overflow pipe does not exchange heat with the refrigerant in the refrigerant heat exchange pipe.

[0005] In some embodiments, the cold carrier cycle further comprises a three-way flow valve. The inlet of the three-way flow valve is in communication with the outlet of the indoor temperature regulating heat exchanger. The first outlet of the three-way flow valve is in communication with the inlet of the heat collecting pipe. The second outlet of the three-way flow valve is in communication with the bypass pipeline. Flow adjusting valve cores are arranged in the first outlet and the second outlet.

[0006] In some embodiments, the solar energy device further comprises a photovoltaic panel, and the photovoltaic panel is thermally coupled to the heat collecting tube.

[0007] In some embodiments, the refrigerant compression cycle has a compressor and an outdoor heat exchanger, the compressor is an air-supplementing and heat-increasing compressor, and when the refrigerant compression cycle operates in a refrigeration condition, the refrigerant outlet pipe of the outdoor heat exchanger is a third pipe. The refrigerant compression cycle also includes a flash evaporator, and the end of the first pipe away from the indoor heat exchanger and the end of the third pipe away from the outdoor heat exchanger are both in the flash evaporator, and the air outlet pipe of the flash evaporator is connected to the air-supplementing port of the compressor. A first throttling element is also connected in series to the first pipe, and the first throttling element is located on the side of the refrigerant heat exchange pipe away from the indoor heat exchanger, and a second throttling element is connected in series to the third pipe.

[0008] In some embodiments, the air conditioning system further includes a four-way reversing valve to switch the flow direction of the refrigerant in the refrigerant compression cycle between a cooling condition and a heating condition.

[0009] The present invention also provides a control method for the air conditioning system as described above, comprising the following steps:

[0010] Get the operating instructions of the air conditioning system;

[0011] According to the operating instructions, the operating mode of the refrigerant compression cycle is controlled, and one of the refrigerant heat exchange tube and the refrigerant flow tube is controlled to be connected in series in the second tube, and the flow rate of the refrigerant in the bypass pipe and the heat collecting pipe is controlled.

[0012] In some embodiments, when the operating instruction is a dual evaporation temperature refrigeration mode, controlling the operating mode of the refrigerant compression cycle according to the operating instruction, controlling one of the brine heat exchange tube and the brine flow tube to be connected in series within the second tube, and controlling the flow rate of the brine in the bypass pipe and the heat collecting pipe specifically include:

[0013] Controlling the refrigerant compression cycle to operate in a refrigeration mode and controlling the coolant heat exchange tube to be connected in series to the second tube, and obtaining a set temperature value, an indoor temperature value, and an indoor humidity value;

[0014] Determining the evaporation temperature of the indoor heat exchanger according to the set temperature value, the indoor temperature value, and the indoor humidity value;

[0015] The rotation speed of the water pump and the flow rate of the brine in the bypass pipe or the heat collecting pipe are controlled and adjusted according to the brine temperature value after the indoor temperature-regulating heat exchanger and the evaporation temperature of the indoor heat exchanger.

[0016] In some embodiments, when the operation instruction is a temperature and humidity control mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the secondary refrigerant heat exchange pipe and the secondary refrigerant flow pipe is connected in series in the second pipe, and the flow of the secondary refrigerant in the bypass pipeline or the heat collection pipe is controlled, specifically including:

[0017] The refrigerant compression cycle is controlled to operate in a refrigeration condition, the secondary refrigerant flow pipe is connected in series in the second pipe, a set temperature value and an indoor temperature value and an indoor humidity value are obtained;

[0018] The evaporation temperature of the indoor heat exchanger is determined according to the set temperature value, the indoor temperature value and the indoor humidity value;

[0019] The speed of the water pump and the flow of the secondary refrigerant in the bypass pipeline or the heat collection pipe are adjusted according to the outlet air temperature of the indoor temperature and humidity control heat exchanger and the indoor temperature value.

[0020] In some embodiments, when the operation instruction is a heating mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the secondary refrigerant heat exchange pipe and the secondary refrigerant flow pipe is connected in series in the second pipe, and the flow of the secondary refrigerant in the bypass pipeline or the heat collection pipe is controlled, specifically including:

[0021] The refrigerant compression cycle is controlled to operate in a heating condition, the secondary refrigerant heat exchange pipe is connected in series in the second pipe, a set temperature value and an indoor temperature value are obtained;

[0022] The condensation temperature of the indoor heat exchanger is determined according to the set temperature value and the indoor temperature value;

[0023] The speed of the water pump and the flow of the secondary refrigerant in the bypass pipeline or the heat collection pipe are adjusted according to the outlet air temperature of the indoor temperature and humidity control heat exchanger.

[0024] In some embodiments, when the operation instruction is a double evaporation temperature refrigeration mode, after the speed of the water pump and the flow of the secondary refrigerant in the bypass pipeline or the heat collection pipe are adjusted according to the temperature value of the secondary refrigerant after the indoor temperature and humidity control heat exchanger and the evaporation temperature of the indoor heat exchanger, the flow of the secondary refrigerant in the bypass pipeline or the heat collection pipe is further adjusted according to the temperature difference of the inlet and outlet secondary refrigerant of the indoor temperature and humidity control heat exchanger and the evaporation temperature of the indoor heat exchanger; or,

[0025] When the operation instruction is the heating mode, after the rotation speed of the water pump and the flow of the secondary refrigerant in the bypass pipeline or the heat collecting pipeline are adjusted according to the outlet air temperature of the indoor temperature regulating heat exchanger, the method further comprises: fine-tuning the flow of the secondary refrigerant in the bypass pipeline or the heat collecting pipeline according to the difference between the evaporation temperatures of the indoor heat exchanger and the indoor temperature regulating heat exchanger.

[0026] In some embodiments, when the operation instruction is the defrosting mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the secondary refrigerant heat exchanger and the secondary refrigerant flow pipe is connected in series in the second pipe, and the flow of the secondary refrigerant in the bypass pipeline and the heat collecting pipeline is controlled, which specifically comprises:

[0027] The refrigerant compression cycle is controlled to operate in the refrigeration working condition, and the outer ring temperature is obtained.

[0028] When the outer ring temperature is higher than a preset temperature and the temperature of the secondary refrigerant in the secondary refrigerant flow pipe is higher than the temperature of the refrigerant in the refrigerant heat exchanger of the indoor heat exchanger, the secondary refrigerant heat exchanger is controlled to be connected in series in the second pipe, and the water pump is controlled to operate.

[0029] The air conditioning system and the control method thereof provided by the application have the following beneficial effects:

[0030] The intermediate heat exchanger simultaneously has the refrigerant heat exchanger connected in series in the first pipe, the secondary refrigerant heat exchanger and the secondary refrigerant flow pipe which can be connected in series in the second pipe, the secondary refrigerant heat exchanger and the secondary refrigerant flow pipe can be selected to be connected in series in the second pipe according to actual needs, so that heat exchange between the secondary refrigerant in the secondary refrigerant circulation and the refrigerant in the refrigerant compression cycle is realized, the indoor temperature regulating heat exchanger is arranged on the outlet air side of the indoor heat exchanger, so that the cold / heat in the secondary refrigerant can be used to further regulate the outlet air flow after heat exchange of the indoor heat exchanger, the secondary refrigerant in the application can be switched or distributed between the bypass pipeline and the heat collecting pipeline, so that fine regulation of the outlet air temperature of the indoor temperature regulating heat exchanger is realized, the sudden change of the outlet air temperature and the large fluctuation of the room temperature caused by shielding of part of the operation frequency points of the compressor in the related art are effectively overcome, and the comfort of the user is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. The drawings in the following description are only exemplary, and other embodiments can be derived from the provided drawings without paying creative labor.

[0032] Figure 1is a system principle schematic diagram of an air conditioning system in the embodiment of the present application;

[0033] Figure 2 is Figure 1 is a refrigerant (solid arrowhead schematic diagram) / cooling medium (hollow arrowhead schematic diagram) flow schematic diagram of the air conditioning system in the embodiment of the present application in a double-evaporation-temperature refrigeration mode, wherein the cooling medium is not shown to flow through the heat collecting pipe, that is, the valve core at the first outlet of the three-way flow valve is cut off;

[0034] Figure 3 is Figure 1 is a refrigerant (solid arrowhead schematic diagram) / cooling medium (hollow arrowhead schematic diagram) flow schematic diagram of the air conditioning system in the embodiment of the present application in a temperature and humidity control mode;

[0035] Figure 4 is Figure 1 is a refrigerant (solid arrowhead schematic diagram) / cooling medium (hollow arrowhead schematic diagram) flow schematic diagram of the air conditioning system in the embodiment of the present application in a heating mode, wherein the cooling medium is not shown to flow through the heat collecting pipe, that is, the valve core at the first outlet of the three-way flow valve is cut off;

[0036] Figure 5 is Figure 1 is a refrigerant (solid arrowhead schematic diagram) / cooling medium (hollow arrowhead schematic diagram) flow schematic diagram of the air conditioning system in the embodiment of the present application in a defrosting mode, wherein the cooling medium is not shown to flow through the bypass pipeline, that is, the valve core at the second outlet of the three-way flow valve is cut off;

[0037] Figure 6 is a control flow schematic diagram when the operation instruction received by the air conditioning system of the present application is a double-evaporation-temperature refrigeration mode;

[0038] Figure 7 is a control flow schematic diagram when the operation instruction received by the air conditioning system of the present application is a temperature and humidity control mode;

[0039] Figure 8 is a control flow schematic diagram when the operation instruction received by the air conditioning system of the present application is a heating mode;

[0040] Figure 9 is a control flow schematic diagram when the operation instruction received by the air conditioning system of the present application is a defrosting mode;

[0041] Figure 10 is Figure 1 is a heat exchange state schematic diagram of the internal flow path of the intermediate heat exchanger in the embodiment of the present application, wherein Fig. (a) is a state in which the cooling medium flows through the cooling medium heat exchange pipe to exchange heat with the refrigerant in the refrigerant heat exchange pipe, Fig. (b) is a state in which the cooling medium flows through the cooling medium flow pipe to avoid heat exchange with the refrigerant in the refrigerant heat exchange pipe, and the arrows in the figures show the flow directions of the refrigerant and the cooling medium.

[0042] Reference signs are:

[0043] 11, indoor heat exchanger; 12, flash evaporator; 13, compressor; 14, outdoor heat exchanger; 151, first throttling element; 152, second throttling element; 16, four-way reversing valve; 21, indoor temperature-regulating heat exchanger; 22, solar energy device; 221, heat collecting tube; 222, photovoltaic panel; 223, solar energy controller; 23, water pump; 24, bypass pipeline; 25, three-way flow valve; 3, intermediate heat exchanger; 41, temperature sensor; 42, temperature and humidity sensor. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0045] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0046] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0047] In addition, it should be noted that the use of the terms "first", "second" and the like is merely intended to distinguish between different components, and does not have any special meaning. Therefore, the above terms should not be interpreted as limiting the scope of the present application.

[0048] Referring to Figures 1 to 10 As shown, according to an embodiment of the present application, an air conditioning system is provided, which comprises a refrigerant compression cycle (not labeled in the figure), a carrier fluid cycle (not labeled in the figure) and an intermediate heat exchanger 3. The refrigerant compression cycle comprises an indoor heat exchanger 11. When the refrigerant compression cycle operates in a cooling mode, the refrigerant inlet pipe of the indoor heat exchanger 11 is a first pipe (not labeled in the figure, and it can be understood that when the refrigerant compression cycle operates in a heating mode, the first pipe will serve as the refrigerant outlet pipe). The carrier fluid cycle comprises an indoor temperature regulating heat exchanger 21, a solar energy device 22, a bypass pipe 24 and a water pump 23 for driving the flow of the carrier fluid cycle. The indoor temperature regulating heat exchanger 21 is located on the air outlet side of the indoor heat exchanger 11 to regulate the air flow of the indoor heat exchanger 11. The solar energy device 22 comprises a heat collecting pipe 221. The bypass pipe 24 is connected in parallel with the heat collecting pipe 221. The flow of the carrier fluid in the bypass pipe 24 and the heat collecting pipe 221 can be controlled and adjusted. The outlet of the water pump 23 is connected to the inlet of the indoor temperature regulating heat exchanger 21 through a second pipe (not labeled in the figure, i.e. the carrier fluid inlet pipe of the indoor temperature regulating heat exchanger 21). The intermediate heat exchanger 3 has a refrigerant heat exchange pipe (not shown or labeled in the figure) connected in series in the first pipe and a carrier fluid heat exchange pipe (not shown or labeled in the figure) and a carrier fluid overflow pipe (not shown or labeled in the figure) which can be selectively connected in series in the second pipe. The carrier fluid in the carrier fluid heat exchange pipe can exchange heat with the refrigerant in the refrigerant heat exchange pipe. The carrier fluid in the carrier fluid overflow pipe does not exchange heat with the refrigerant in the refrigerant heat exchange pipe. Specifically, the carrier fluid heat exchange pipe and the refrigerant heat exchange pipe are arranged to be thermally coupled to each other, while the carrier fluid overflow pipe is arranged in a region away from the refrigerant heat exchange pipe, specifically, the cold or heat of the refrigerant should not be transferred to the carrier fluid in the carrier fluid overflow pipe. The heat collecting pipe 221 specifically adopts the existing solar energy utilization technology to convert light energy into heat of the carrier fluid flowing therein. The present application does not intend to improve the specific structure of the heat collecting pipe 221. A conventional heat collecting pipe assembly can be used. It can be understood that the intermediate heat exchanger 3 can adopt a tube sleeve type heat exchanger in specific implementation, which is simple in structure and reliable.

[0049] In the technical solution, the intermediate heat exchanger 3 simultaneously has the refrigerant heat exchange pipe connected in series in the first pipe, the chilled liquid heat exchange pipe capable of being connected in series in the second pipe and the chilled liquid flow pipe, wherein the chilled liquid heat exchange pipe and the chilled liquid flow pipe can be selected to be connected in series in the second pipe according to actual needs, so that heat exchange between the chilled liquid in the chilled liquid circulation and the refrigerant in the refrigerant compression circulation is realized, and since the indoor temperature adjustment heat exchanger 21 is arranged at the air outlet side of the indoor heat exchanger 11, the cold / heat in the chilled liquid can be used to further adjust the temperature of the air flow after heat exchange of the indoor heat exchanger 11, and meanwhile, the chilled liquid in the application can be switched or distributed between the bypass pipe and the heat collecting pipe, so that fine adjustment of the indoor temperature adjustment heat exchanger 21 to the air outlet temperature can be realized, the sudden change of the air outlet temperature and the large fluctuation of the room temperature caused by shielding of part of the operation frequency points of the compressor in the related art are effectively overcome, and the comfort of the user is improved.

[0050] It should be noted that, taking the refrigerant compression circulation in the refrigeration working condition as an example, at this time, the indoor heat exchanger 11 absorbs indoor heat as an evaporator, and when a certain operation frequency point of the compressor (the operation frequency point corresponding to the comfortable refrigeration temperature) is shielded, the evaporation temperature of the indoor heat exchanger 11 at this time may be low, and if the air outlet temperature is not adjusted, the air outlet temperature will be low, and after a period of operation, the air conditioning system receives the corresponding temperature feedback and adjusts the operation frequency point to continue operation, but the operation frequency point is still not the appropriate frequency point, and such repeated adjustment will cause the indoor temperature to fluctuate up and down. By using the embodiment of the application, when the operation frequency point is higher than the appropriate frequency point, the chilled liquid can be used to transfer part of the cold of the refrigerant from the refrigerant compression circulation to the chilled liquid circulation, and further to the heat collecting pipe 221 to absorb heat, so that the solar heat is used to reduce the excessive cold in the refrigerant compression circulation, so that the temperature adjustment purpose of the indoor temperature adjustment heat exchanger 21 is realized, the air outlet temperature is at the set temperature, and the comfort is improved. In the process, the flow of the chilled liquid in the bypass pipe 24 or the heat collecting pipe 221 can be controlled according to the actual temperature adjustment needs, specifically, the more the cold needs to be reduced, the greater the flow into the heat collecting pipe 221 is controlled. When the evaporation temperature of the indoor heat exchanger 11 is possibly high due to shielding of a certain operation frequency point of the compressor, the chilled liquid heat exchange pipe can be used to transfer the cold in the refrigerant heat exchange pipe to the chilled liquid circulation, at this time, the chilled liquid circulation is formed from the bypass pipe 24 without the chilled liquid flowing in the heat collecting pipe 221, so that the heat exchange area of the air outlet flow is increased objectively, the heat exchange effect is improved, and the air outlet temperature at the same evaporation temperature is also reduced. The fine temperature adjustment principle in the refrigeration working condition of the refrigerant compression circulation is similar to the above-mentioned refrigeration working condition, and is not described herein.

[0051] The flow distribution of the aforementioned refrigerant circulating in the bypass pipeline 24 and the heat collecting pipeline 221 can be achieved in various ways, for example, by respectively arranging corresponding electromagnetic flow valves on the bypass pipeline 24 and the heat collecting pipeline 221, and by controlling the on-off and opening degree of the electromagnetic flow valves on the corresponding pipelines to achieve the distribution of the refrigerant flow. In a preferred embodiment, the refrigerant circulating further comprises a three-way flow valve 25, the inlet of the three-way flow valve 25 is in communication with the outlet of the indoor temperature regulating heat exchanger 21, the first outlet of the three-way flow valve 25 is in communication with the inlet of the heat collecting pipeline 221, the second outlet of the three-way flow valve 25 is in communication with the bypass pipeline 24, and flow adjusting valve cores (not shown in the figure) are arranged in the first outlet and the second outlet.

[0052] In the technical solution, the three-way flow valve 25 integrated with the flow adjusting valve core is used to match and control the flow of the refrigerant in the bypass pipeline 24 and the heat collecting pipeline 221, which can simplify the connection of the pipeline.

[0053] As a specific embodiment, the solar energy device 22 further comprises a photovoltaic panel 222, which is in thermal coupling connection with the heat collecting pipeline 221. In this way, the refrigerant in the refrigerant circulating can be used to further cool the photovoltaic panel 222 after exchanging heat with the refrigerant at the intermediate heat exchanger 3, thereby improving the power generation efficiency of the photovoltaic panel 222. It can be understood that the refrigerant compression cycle should be operated in the refrigeration working condition when the photovoltaic panel 222 is cooled, and the refrigerant heat exchange pipeline is connected in series in the second pipeline. The aforementioned solar energy device 22 further comprises a corresponding solar energy controller, so as to store or transmit the power generation of the photovoltaic panel 222 to the air conditioning system (air conditioner) for use.

[0054] Specifically referring to Figure 10 As shown, the refrigerant heat exchange pipeline and the refrigerant flow pipeline in the intermediate heat exchanger 3 are connected through a switching valve part (for example, a controllable three-way valve) arranged at the convergence position of the two pipelines to achieve the flow control of the refrigerant, wherein the refrigerant heat exchange pipeline and the refrigerant heat exchange pipeline are in thermal coupling to form a heat exchange structure, and the refrigerant flow pipeline is far away from the refrigerant heat exchange pipeline to prevent heat exchange between them. It can be understood that the aforementioned refrigerant heat exchange pipeline and the refrigerant heat exchange pipeline can be arranged in multiple to improve the heat exchange efficiency and effect between them.

[0055] Specifically referring to Figure 1As shown, the refrigerant compression cycle has a compressor 13, an outdoor heat exchanger 14, the compressor 13 is a charge boosting enthalpy increasing compressor, so as to improve the high temperature refrigeration capacity and energy efficiency of the air conditioning system, specifically, in the refrigeration operating condition of the refrigerant compression cycle, the refrigerant outlet pipe of the outdoor heat exchanger 14 is a third pipe, the refrigerant compression cycle further comprises a flash evaporator 12, one end of the first pipe away from the indoor heat exchanger 11 and one end of the third pipe away from the outdoor heat exchanger 14 are both in the flash evaporator 12, and the gas outlet pipe of the flash evaporator 12 is communicated with the charge inlet of the compressor 13, a first throttling element 151 (such as an electronic expansion valve) is further connected in series on the first pipe and the first throttling element 151 is located on the side of the refrigerant heat exchange pipe away from the indoor heat exchanger 11, and a second throttling element 152 (such as an electronic expansion valve) is connected in series on the third pipe.

[0056] In the technical scheme, the flash evaporator 12 is arranged to realize charge boosting enthalpy increasing of the compressor 13, so as to improve the high temperature refrigeration capacity and system energy efficiency of the air conditioning system.

[0057] In some embodiments, the air conditioning system further comprises a four-way reversing valve 16, so as to realize flow direction switching of the refrigerant in the refrigerant compression cycle between the refrigeration condition and the heating condition, that is, the refrigerant compression cycle of the application has the refrigeration condition and the heating condition, and the working performance of the air conditioning system of the application is improved.

[0058] It can be understood that, in order to make the air conditioning system of the application more accurate and intelligent in control, corresponding temperature and humidity sensors 42 or temperature sensors 41 are arranged on or near each related component, so as to realize detection of the temperature and humidity (temperature and humidity) of the setting position area.

[0059] According to the embodiments of the application, an air conditioning system control method is also provided, which comprises the following steps:

[0060] Obtaining an operation instruction of the air conditioning system;

[0061] According to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the heat transfer pipe and the heat transfer pipe of the heat transfer pipe is connected in series in the second pipe, and the flow of the heat transfer pipe in the bypass pipe 24 and the heat collecting pipe 221 is controlled, so as to form more fine control of the outlet air flow temperature according to different operation modes of the air conditioning system.

[0062] Specifically, Figure 2As shown, when the operation instruction is the double-evaporation-temperature refrigeration mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the load carrier heat exchange pipe and the load carrier flow pipe is connected in series in the second pipe, and the flow of the load carrier in the bypass pipeline 24 and the heat collection pipe 221 is controlled, which specifically includes:

[0063] The refrigerant compression cycle is controlled to operate in the refrigeration working condition, and the load carrier heat exchange pipe is controlled to be connected in series in the second pipe, so that the load carrier in the load carrier cycle can exchange heat with the refrigerant in the refrigerant compression cycle, thereby realizing the transfer of the cold quantity of the load carrier to the refrigerant, and obtaining the set temperature value, the indoor temperature value and the indoor humidity value.

[0064] The evaporation temperature of the indoor heat exchanger 11 is determined according to the set temperature value, the indoor temperature value and the indoor humidity value, so as to realize the first refrigeration cooling of the indoor airflow. It can be understood that adjusting the evaporation temperature of the indoor heat exchanger 11 to a suitable value according to the set temperature value, the indoor temperature value and the indoor humidity value is a routine knowledge in the art, and will not be described herein.

[0065] The speed of the water pump 23 and the flow of the load carrier in the bypass pipeline 24 or the heat collection pipe 221 are controlled according to the temperature value of the load carrier after the indoor temperature adjustment heat exchanger 21 and the evaporation temperature of the indoor heat exchanger 11. Specifically, when it is necessary to reduce the excessive cold quantity at the heat collection pipe 221, the load carrier is controlled to flow into the heat collection pipe 221, the more the cold quantity to be reduced, the greater the flow into the heat collection pipe 221, and the less the flow of the load carrier into the bypass pipeline 24 or even be completely cut off. On the contrary, when it is necessary to reduce the cold quantity at the heat collection pipe 221, the load carrier is controlled to be cut off into the heat collection pipe 221, thereby realizing the fine control of the outlet air temperature in the refrigeration mode. Further, in the case of operating the mode, as a more optimal implementation manner, the flow of the load carrier in the bypass pipeline 24 or the heat collection pipe 221 is fine-tuned according to the temperature difference between the inlet and outlet load carriers of the indoor temperature adjustment heat exchanger 21 and the evaporation temperature of the indoor heat exchanger 11, thereby further realizing the fine adjustment of the outlet air temperature.

[0066] Specifically referring to Figure 3 As shown, when the operation instruction is the temperature and humidity control mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the load carrier heat exchange pipe and the load carrier flow pipe is connected in series in the second pipe, and the flow of the load carrier in the bypass pipeline 24 and the heat collection pipe 221 is controlled, which specifically includes:

[0067] controlling the refrigerant compression cycle to run in a refrigeration mode and controlling the secondary heat exchange pipe to be connected in series in the second pipe to utilize the outdoor temperature or the heat collected by the heat collecting pipe to increase the temperature of the air flow after the air flow is exchanged with the indoor heat exchanger 11 in the indoor temperature adjusting heat exchanger 21, and obtaining the set temperature value, the indoor temperature value and the indoor humidity value;

[0068] determining the evaporation temperature of the indoor heat exchanger 11 according to the set temperature value, the indoor temperature value and the indoor humidity value;

[0069] controlling the rotation speed of the water pump 23 and the flow of the secondary refrigerant in the bypass pipe 24 or the heat collecting pipe 221 according to the outlet air temperature of the indoor temperature adjusting heat exchanger 21 and the indoor temperature value.

[0070] In the technical solution, the indoor heat exchanger 11 is used to cool and dehumidify the indoor air flow, and the secondary refrigerant is used to absorb the outdoor temperature or the heat collecting temperature of the heat collecting pipe 221 to increase the temperature of the air flow after the air flow is exchanged with the indoor heat exchanger 11 in the indoor temperature adjusting heat exchanger 21, so as to prevent the discomfort caused by the supercooling of the air flow and improve the comfort of the user. It can be understood that the lower the temperature of the air flow of the indoor heat exchanger 11, the greater the flow of the secondary refrigerant into the heat collecting pipe 221, and vice versa. The temperature increasing capacity of the indoor temperature adjusting heat exchanger 21 depends on the distribution of the secondary refrigerant in the bypass pipe 24 and the heat collecting pipe 221.

[0071] Specifically referring to Figure 4 When the operation instruction is a heating mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the secondary refrigerant heat exchange pipe and the secondary refrigerant flow pipe is connected in series in the second pipe, and the flow of the secondary refrigerant in the bypass pipe 24 and the heat collecting pipe 221 is controlled, which specifically includes:

[0072] controlling the refrigerant compression cycle to run in a heating mode and controlling the secondary refrigerant heat exchange pipe to be connected in series in the second pipe to obtain the set temperature value and the indoor temperature value. After the secondary refrigerant and the refrigerant are exchanged in the intermediate heat exchanger 3, the secondary refrigerant transfers part of the heat of the refrigerant to the indoor temperature adjusting heat exchanger 21, so that the air flow of the indoor heat exchanger 11 is heated twice by the indoor temperature adjusting heat exchanger 21, and the indoor temperature adjusting heat exchanger 21 objectively increases the heat exchange area;

[0073] determining the condensation temperature of the indoor heat exchanger 11 according to the set temperature value and the indoor temperature value;

[0074] The rotation speed of the water pump 23 and the flow of the carrier refrigerant in the bypass pipeline 24 or the heat collecting pipeline 221 are controlled according to the outlet air temperature of the indoor temperature regulating heat exchanger 21. Generally, the temperature in the heat collecting pipeline 211 is generally lower than the heat temperature of the refrigerant, so the carrier refrigerant is controlled to be cut off from flowing into the heat collecting pipeline 211 and to form circulation from the bypass pipeline 24.

[0075] In the technical solution, the carrier refrigerant transfers part of the heat of the refrigerant to the indoor temperature regulating heat exchanger 21 after heat exchange with the refrigerant in the intermediate heat exchanger 3, so that the outlet air flow of the indoor heat exchanger 11 is heated twice by the indoor temperature regulating heat exchanger 21, and the indoor temperature regulating heat exchanger 21 objectively forms an increase in the heat exchange area.

[0076] Further, during the operation in the heating mode, the flow of the carrier refrigerant in the bypass pipeline 24 or the heat collecting pipeline 221 is further adjusted according to the difference between the evaporation temperatures of the indoor heat exchanger 11 and the indoor temperature regulating heat exchanger 21, so as to further adjust the temperature of the outlet air flow.

[0077] Specifically referring to Figure 5 When the operation instruction is the defrosting mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the carrier refrigerant heat exchange pipeline and the carrier refrigerant overflow pipeline is connected in series in the second pipeline, and the flow of the carrier refrigerant in the bypass pipeline 24 and the heat collecting pipeline 221 is controlled, which specifically includes:

[0078] The refrigerant compression cycle is controlled to operate in the refrigeration working condition, and the outer ring temperature (i.e. the external environment temperature) is obtained.

[0079] When the outer ring temperature is higher than a preset temperature (for example, 0℃) and the temperature of the carrier refrigerant in the carrier refrigerant overflow pipeline is higher than the temperature of the refrigerant in the refrigerant heat exchange pipeline of the indoor heat exchanger 11 (at this time, it is indicated that the heat of the carrier refrigerant can be recycled), the carrier refrigerant heat exchange pipeline is controlled to be connected in series in the second pipeline, and the water pump 23 is controlled to operate.

[0080] In the technical solution, when the air conditioning system is running in the defrosting mode, the load heat exchange pipe is connected in series in the second pipe when the outer ring temperature is higher than the preset temperature and the load heat exchange pipe temperature is higher than the refrigerant temperature in the refrigerant heat exchange pipe, so as to use the load heat exchange pipe with higher temperature to heat the refrigerant with lower temperature, thereby compensating for the temperature drop on the indoor side, improving the suction temperature of the compressor, preventing the occurrence of liquid suction phenomenon of the compressor, and also improving the exhaust temperature of the compressor to a certain extent, thereby shortening the defrosting time of the outdoor heat exchanger. It can be understood that when the outer ring temperature is lower than the preset temperature or the load heat exchange pipe temperature is lower than the refrigerant temperature in the refrigerant heat exchange pipe, the load heat exchange pipe in the load heat exchange pipe circulation cannot compensate for the heat of the refrigerant, at this time the air conditioning system runs in the conventional defrosting mode, that is, the water pump 23 does not need to run, and the load heat exchange pipe is cut off from the circulation of the load heat exchange pipe.

[0081] Those skilled in the art can understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0082] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An air conditioning system, characterized by, The air conditioning system comprises a refrigerant compression cycle, a carrier refrigerant cycle and an intermediate heat exchanger (3). The refrigerant compression cycle comprises an indoor heat exchanger (11). When the refrigerant compression cycle operates in a refrigeration mode, the refrigerant inlet pipe of the indoor heat exchanger (11) is a first pipe. The carrier refrigerant cycle comprises an indoor temperature regulating heat exchanger (21), a solar energy device (22), a bypass pipe (24) and a water pump (23) for driving the flow of the carrier refrigerant cycle. The indoor temperature regulating heat exchanger (21) is located on the air outlet side of the indoor heat exchanger (11) to regulate the temperature of the air flow of the indoor heat exchanger (11). The solar energy device (22) comprises a heat collecting pipe (221). The bypass pipe (24) is connected in parallel with the heat collecting pipe (221). The flow of the carrier refrigerant in the bypass pipe (24) and the heat collecting pipe (221) can be controlled and adjusted. The carrier refrigerant inlet pipe of the indoor temperature regulating heat exchanger (21) is a second pipe. The intermediate heat exchanger (3) has a refrigerant heat exchange pipe connected in series in the first pipe and a carrier refrigerant heat exchange pipe and a carrier refrigerant overflow pipe which can be selectively connected in series in the second pipe. The carrier refrigerant in the carrier refrigerant heat exchange pipe can exchange heat with the refrigerant in the refrigerant heat exchange pipe. The carrier refrigerant in the carrier refrigerant overflow pipe does not exchange heat with the refrigerant in the refrigerant heat exchange pipe.

2. The air conditioning system of claim 1, wherein, The carrier refrigerant cycle further comprises a three-way flow valve (25). The inlet of the three-way flow valve (25) is connected with the outlet of the indoor temperature regulating heat exchanger (21). The first outlet of the three-way flow valve (25) is connected with the inlet of the heat collecting pipe (221). The second outlet of the three-way flow valve (25) is connected with the bypass pipe (24). Flow adjusting valve cores are arranged in the first outlet and the second outlet.

3. The air conditioning system of claim 1, wherein, The solar energy device (22) further comprises a photovoltaic panel (222). The photovoltaic panel (222) is connected with the heat collecting pipe (221) in thermal coupling.

4. The air conditioning system of claim 1, wherein, The refrigerant compression cycle has a compressor (13) and an outdoor heat exchanger (14). The compressor (13) is a charge heat injection compressor. When the refrigerant compression cycle operates in a refrigeration mode, the refrigerant outlet pipe of the outdoor heat exchanger (14) is a third pipe. The refrigerant compression cycle further comprises a flash evaporator (12). The end of the first pipe away from the indoor heat exchanger (11) and the end of the third pipe away from the outdoor heat exchanger (14) are both located in the flash evaporator (12). The gas outlet pipe of the flash evaporator (12) is connected with the charge inlet of the compressor (13). A first throttling element (151) is connected in series on the first pipe and located on the side of the refrigerant heat exchange pipe away from the indoor heat exchanger (11). A second throttling element (152) is connected in series on the third pipe.

5. The air conditioning system of claim 4, wherein, A four-way reversing valve (16) is further arranged to switch the flow direction of the refrigerant of the refrigerant compression cycle between the refrigeration mode and the heating mode.

6. A control method of an air conditioning system as claimed in any one of claims 1 to 5, characterized by, The method comprises the following steps: obtaining an operation instruction of an air conditioning system; According to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the secondary coolant heat exchange pipes and the secondary coolant flow pipes is connected in series in the second pipe, and the flow of the secondary coolant in the bypass pipeline (24) and the heat collecting pipe (221) is controlled.

7. The control method according to claim 6, characterized by When the operation instruction is the double evaporation temperature refrigeration mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the secondary coolant heat exchange pipes and the secondary coolant flow pipes is connected in series in the second pipe, and the flow of the secondary coolant in the bypass pipeline (24) and the heat collecting pipe (221) is controlled, specifically including: The refrigerant compression cycle is controlled to operate in the refrigeration condition, the secondary coolant heat exchange pipe is connected in series in the second pipe, the set temperature value, the indoor temperature value and the indoor humidity value are obtained, the evaporation temperature of the indoor heat exchanger (11) is determined according to the set temperature value, the indoor temperature value and the indoor humidity value, the rotation speed of the water pump (23) and the flow of the secondary coolant in the bypass pipeline (24) or the heat collecting pipe (221) are controlled according to the temperature of the secondary coolant after the indoor temperature adjusting heat exchanger (21) and the evaporation temperature of the indoor heat exchanger (11). When the operation instruction is the temperature and humidity control mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the secondary coolant heat exchange pipes and the secondary coolant flow pipes is connected in series in the second pipe, and the flow of the secondary coolant in the bypass pipeline (24) and the heat collecting pipe (221) is controlled, specifically including: The refrigerant compression cycle is controlled to operate in the refrigeration condition, the secondary coolant flow pipe is connected in series in the second pipe, the set temperature value, the indoor temperature value and the indoor humidity value are obtained, the evaporation temperature of the indoor heat exchanger (11) is determined according to the set temperature value, the indoor temperature value and the indoor humidity value, the rotation speed of the water pump (23) and the flow of the secondary coolant in the bypass pipeline (24) or the heat collecting pipe (221) are controlled according to the outlet air temperature of the indoor temperature adjusting heat exchanger (21) and the indoor temperature value.

8. The control method according to claim 6, characterized by, When the operation instruction is the heating mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the secondary coolant heat exchange pipes and the secondary coolant flow pipes is connected in series in the second pipe, and the flow of the secondary coolant in the bypass pipeline (24) and the heat collecting pipe (221) is controlled, specifically including: The refrigerant compression cycle is controlled to operate in the heating condition, the secondary coolant heat exchange pipe is connected in series in the second pipe, the set temperature value and the indoor temperature value are obtained, the condensation temperature of the indoor heat exchanger (11) is determined according to the set temperature value and the indoor temperature value, the rotation speed of the water pump (23) and the flow of the secondary coolant in the bypass pipeline (24) or the heat collecting pipe (221) are controlled according to the outlet air temperature of the indoor temperature adjusting heat exchanger (21). ​ ​ 9. The control method according to claim 6, characterized by, ​ ​ ​ ​ 10. The control method according to claim 7 or 9, characterized by, When the operation instruction is the double-evaporation-temperature refrigeration mode, after the rotation speed of the water pump (23) and the flow rate of the carrier fluid in the bypass pipeline (24) or the heat collecting pipe (221) are adjusted according to the temperature value of the carrier fluid after the indoor temperature-adjusting heat exchanger (21) and the evaporation temperature of the indoor heat exchanger (11), the method further comprises: adjusting the flow rate of the carrier fluid in the bypass pipeline (24) or the heat collecting pipe (221) according to the temperature difference between the inlet and outlet carrier fluids of the indoor temperature-adjusting heat exchanger (21) and the evaporation temperature of the indoor heat exchanger (11); or, When the operation instruction is the heating mode, after the rotation speed of the water pump (23) and the flow rate of the carrier fluid in the bypass pipeline (24) or the heat collecting pipe (221) are adjusted according to the outlet air temperature of the indoor temperature-adjusting heat exchanger (21), the method further comprises: adjusting the flow rate of the carrier fluid in the bypass pipeline (24) or the heat collecting pipe (221) according to the difference between the evaporation temperatures of the indoor heat exchanger (11) and the indoor temperature-adjusting heat exchanger (21).

11. The control method according to claim 6, characterized by, When the operation instruction is the defrosting mode, according to the operation instruction, the operation mode of the refrigerant compression cycle is controlled, one of the carrier fluid heat exchanger pipe and the carrier fluid flow pipe is connected in series in the second pipe, and the flow rate of the carrier fluid in the bypass pipeline (24) and the heat collecting pipe (221) is controlled, which specifically comprises: The refrigerant compression cycle is controlled to operate in the refrigeration working condition, and the outer ring temperature is obtained; When the outer ring temperature is higher than a preset temperature and the temperature of the carrier fluid in the carrier fluid flow pipe is higher than the temperature of the refrigerant in the refrigerant heat exchanger pipe of the indoor heat exchanger (11), the carrier fluid heat exchanger pipe is controlled to be connected in series in the second pipe, and the water pump (23) is controlled to operate.

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