Air-fluorine water machine system and control method

Abstract

This application provides a refrigerant-based water-cooled chiller system and control method. The system includes: a compressor connected via refrigerant piping; a floor heating circulation loop including a water-side heat exchanger and a corresponding floor heating expansion valve; an indoor circulation loop including an indoor heat exchanger and a corresponding indoor expansion valve; an outdoor heat exchanger; and a refrigerant bypass piping, at least partially corresponding to the outdoor heat exchanger, with its first end connected to the water-side heat exchanger and its second end connected to the floor heating expansion valve. By providing the refrigerant bypass piping, in indoor cooling mode, even if liquid refrigerant leaks from the floor heating expansion valve, the liquid refrigerant will first enter the outdoor heat exchanger, evaporate into gas, then enter the water-side heat exchanger and flow to the compressor. This effectively avoids the risk of low-temperature freezing damage caused by liquid refrigerant leakage and prevents the air conditioner from operating with insufficient refrigerant, ensuring system energy efficiency.

Description

Technical Field

[0001] This application relates to the field of refrigeration / cooling equipment technology, specifically to a refrigerated water chiller system and its control method. Background Technology

[0002] In an integrated water-cooled air conditioning unit, the water-side heat exchanger generally only has a heating function. When the indoor unit of the air conditioner is in cooling mode, the electronic expansion valve of the water-side heat exchanger will be closed. However, after the electronic expansion valve has been running for a long time, or when there are small impurities in the system, there is a probability that the electronic expansion valve cannot be completely closed, resulting in the leakage of low-temperature liquid refrigerant into the water-side heat exchanger, which will cause the following problems: (1) The liquid refrigerant has a certain probability of freezing and damaging the water-side heat exchanger, causing the whole unit to be scrapped; (2) Some liquid refrigerant is stored in the water-side heat exchanger, causing the air conditioner to operate with less refrigerant, and the air conditioning effect and reliability will be reduced.

[0003] In existing technologies, a solenoid valve is installed before the electronic expansion valve to solve the above problems. However, as the unit ages or when there are small impurities in the system, the solenoid valve may not be able to close completely, leading to leakage. Alternatively, a check valve may be installed before the electronic expansion valve, but this also presents a possibility of leakage when the pressure difference between the two ends is insufficient, or when there are small impurities in the system, or when the valve plate is misaligned, leading to leakage. Summary of the Invention

[0004] This application aims to provide a fluorine-to-water chiller system and control method to at least solve or alleviate some of the problems existing in the prior art.

[0005] This application provides a refrigerant-based water-cooled chiller system, comprising: a compressor connected via a refrigerant pipeline; a floor heating circulation loop including a water-side heat exchanger and a corresponding floor heating expansion valve installed on the water-side heat exchanger; an indoor circulation loop including an indoor heat exchanger and a corresponding indoor expansion valve installed on the indoor heat exchanger; an outdoor heat exchanger; and further comprising: a refrigerant bypass pipeline, at least partially corresponding to the outdoor heat exchanger, with its first end connected to the water-side heat exchanger and its second end connected to the floor heating expansion valve.

[0006] In the optional technical solution, the portion of the refrigerant bypass pipeline corresponding to the outdoor heat exchanger is located at the bottom of the outdoor heat exchanger.

[0007] The optional technical solutions also include: an indoor heating mode activation control module, which controls and instructs the air-cooled water-cooled unit system to accept commands from the outside to activate indoor heating; and a refrigerant bypass adjustment module, which adjusts the opening of the expansion valve on the floor heating side according to the operating conditions of the outdoor heat exchanger.

[0008] In the optional technical solutions, the operating conditions of the outdoor heat exchanger include at least the outlet refrigerant temperature or outlet refrigerant pressure of the outdoor heat exchanger.

[0009] The optional technical solution also includes: an indoor cooling mode activation control module, which controls and instructs the air-cooled water chiller system to accept commands from the outside to activate indoor cooling.

[0010] The optional technical solution also includes: a floor heating mode activation control module, which controls and instructs the Tianfu floor water unit system to accept commands from the outside to activate the floor heating mode.

[0011] Another aspect of this application provides a control method for a natural gas-fired water chiller system, comprising controlling the aforementioned natural gas-fired water chiller system, including:

[0012] Indoor heating mode activation procedure: The air-cooled water-cooled unit system receives an external command to activate indoor heating.

[0013] The refrigerant bypass adjustment procedure involves adjusting the opening of the expansion valve on the underfloor heating side according to the operating conditions of the outdoor heat exchanger.

[0014] The control method for the optional air-to-water refrigerant chiller system also includes: a refrigerant outlet pressure detection step for the outdoor heat exchanger, which detects the refrigerant outlet pressure of the outdoor heat exchanger and feeds it back to the refrigerant bypass regulation step.

[0015] The control method for the optional air-to-water refrigerant chiller system also includes: a refrigerant outlet temperature detection step for the outdoor heat exchanger, which detects the refrigerant outlet temperature of the outdoor heat exchanger and feeds it back to the refrigerant bypass regulation step.

[0016] The control method for the optional refrigerant-based water chiller system also includes: an outside air temperature detection step, which detects the outside air temperature and feeds it back to the refrigerant bypass adjustment step. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pipeline connection of the Tianfu groundwater unit system in the first embodiment of this application.

[0018] Figure 2 This is a schematic diagram showing the location of the refrigerant bypass pipeline in the first embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the control module of the Tianfu groundwater unit system in the second embodiment of this application.

[0020] Figure 4 This is a schematic diagram illustrating the execution steps of the control method for the Tianfudi water unit system in the third embodiment of this application.

[0021] Figure reference numerals: 1. Refrigerant-based water-cooled unit system; 101. Compressor; 102. Water-side heat exchanger; 103. Underfloor heating-side expansion valve; 104. Underfloor heating circulation loop; 105. Outdoor heat exchanger; 106. First shut-off valve; 107. Second shut-off valve; 108. Refrigerant bypass pipeline; 108a. Four-way valve; 109. Indoor expansion valve; 110. Indoor heating mode activation control module; 111. Refrigerant bypass adjustment module; 112. Indoor cooling mode activation control module; 113. Underfloor heating mode activation control module; 114. Detailed Implementation

[0022] It should be noted that the following will use examples to illustrate the working principle, characteristics and advantages of the fluorine-water generator system and control method according to this application. However, it should be understood that all descriptions are given for illustrative purposes only and should not be construed as limiting this application in any way.

[0023] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the various figures, this application still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, thereby obtaining more other embodiments of this application that may not be directly mentioned herein.

[0024] <First Implementation Method>

[0025] Figure 1 This is a schematic diagram of the pipeline connection of the Tianfu groundwater unit system in the first embodiment of this application.

[0026] like Figure 1 As shown, the refrigerant-cooled water-cooled unit system 1 involved in this embodiment includes a compressor 101 connected via refrigerant pipes, a water-side heat exchanger 102, and a floor heating circulation loop 104 corresponding to the water-side heat exchanger 102, including a floor heating-side expansion valve 103 (in conjunction with...). Figure 2 The figure shows an indoor circulation loop (not shown) including at least one indoor heat exchanger (not shown) connected to the first shut-off valve 106 and the second shut-off valve 107 and an indoor expansion valve 110 provided for the corresponding indoor heat exchanger, and an outdoor heat exchanger 105.

[0027] Specifically, the indoor circulation loop is connected to the underfloor heating circulation loop 104, the compressor 101, and the outdoor heat exchanger 105 via refrigerant pipes through the first shut-off valve 106 and the second shut-off valve 107. The connection method between the compressor 101 and the four-way valve 109, the indoor circulation loop, the underfloor heating circulation loop 104, and the outdoor heat exchanger 105 is a conventional technology in this field and will not be described in detail here.

[0028] like Figure 1 and Figure 2 As shown, the refrigerant bypass pipeline 108 is also included in the refrigerant-water chiller system 1 of this embodiment.

[0029] The refrigerant bypass pipe 108 is at least partially provided for the outdoor heat exchanger 105, with its first end connected to the water-side heat exchanger 102 and its second end connected to the underfloor heating expansion valve 103.

[0030] Specifically, in the indoor cooling mode of the air-cooled water-cooled unit system 1, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 101 flows into the outdoor heat exchanger 105 after passing through the four-way valve 109, where it exchanges heat with the outdoor heat exchange medium, such as air. After the high-temperature and high-pressure gaseous refrigerant condenses, it flows out of the outdoor heat exchanger 105, expands into a low-temperature and low-pressure refrigerant through the indoor expansion valve 110, and flows into the indoor circulation loop, where it absorbs heat in the indoor heat exchanger to provide a cold source for the indoor side.

[0031] At this time, the expansion valve 103 on the underfloor heating side remains closed to ensure that the refrigerant flowing out of the outdoor heat exchanger 105 does not enter the underfloor heating circulation loop. Even if the expansion valve 103 on the underfloor heating side leaks, the leaked low-temperature liquid refrigerant will first flow into the refrigerant bypass pipe 108. This is because the refrigerant bypass pipe 108 is at least partially located corresponding to the outdoor heat exchanger 105, specifically, for example, at the bottom or side of the outdoor heat exchanger 105. Therefore, the external air heat source drawn by the fan when the outdoor heat exchanger 105 is working can be utilized. The leaked low-temperature liquid refrigerant will undergo heat absorption and evaporation locally in the refrigerant bypass pipe 108 to form gaseous refrigerant, which will then flow into the water-side heat exchanger 102 in gaseous form, rather than flowing into the water-side heat exchanger 102 as low-temperature liquid refrigerant.

[0032] In this embodiment, because a refrigerant bypass pipe 108 is provided, even in indoor cooling mode, if a small amount of liquid refrigerant leaks from the expansion valve 103 on the underfloor heating side, the liquid refrigerant will first enter the portion of the refrigerant bypass pipe 108 corresponding to the outdoor heat exchanger 105 to absorb heat and evaporate in advance. This prevents it from entering the water-side heat exchanger 102 in the form of low-temperature liquid refrigerant to absorb heat, effectively preventing the residual water in the water-side heat exchanger 102 from freezing and improving the reliability of the operation of the air-cooled water-cooled unit system 1.

[0033] Furthermore, when the gaseous refrigerant formed after heat absorption and evaporation in the refrigerant bypass pipe 108 enters the water-side heat exchanger 102, even if there is still heat absorption at a low temperature, it is only through sensible heat absorption, which can effectively reduce the temperature drop of the water-side heat exchanger 102. At the same time, compared with liquid refrigerant, the gaseous refrigerant after evaporation has poor thermal conductivity and a lower heat exchange rate with the metal surface, which can effectively reduce the low-temperature impact of direct contact between the refrigerant and the water-side heat exchanger 102. Thus, in indoor cooling mode, it can effectively avoid the risk of low-temperature freezing damage when liquid refrigerant leaks, and ensure the reliable operation of the system.

[0034] In addition, after the leaked liquid refrigerant absorbs heat and evaporates into gas in the refrigerant bypass pipe 108, the refrigerant's fluidity is enhanced. It can then flow back to the compressor 101 through the refrigerant pipe via the water-side heat exchanger 102 and the four-way valve 109. This effectively prevents the leaked liquid refrigerant from remaining in the water-side heat exchanger 102 in liquid form, thus preventing insufficient refrigerant operation in the entire water-cooled refrigerant chiller system 1 during indoor cooling mode operation. This ensures the operating effect and reliability of the water-cooled refrigerant chiller system 1.

[0035] Figure 2 This is a schematic diagram showing the location of the refrigerant bypass pipeline in the embodiment of this application.

[0036] like Figure 2 As shown, the portion of the refrigerant bypass pipe 108 corresponding to the outdoor heat exchanger 105 is located at the bottom of the outdoor heat exchanger 105.

[0037] Specifically, the heat dissipation pipe 108a connected to the refrigerant bypass pipe 108 is independently installed at the bottom of the outdoor heat exchanger 105. The flow direction and function of the refrigerant bypass pipe 108 when the air-cooled water-cooled unit system 1 is operating in indoor cooling mode have been explained above.

[0038] When the underfloor heating and air conditioning in the Tianfu-Dishui unit system 1 are operating in heating mode simultaneously, or when the underfloor heating is operating in heating mode alone, the expansion valve 103 on the underfloor heating side will remain open and its opening degree will be adjusted appropriately according to the operating conditions. At this time, the high-temperature and high-pressure gaseous refrigerant generated by the compressor 101 enters the water-side heat exchanger 102 for heat exchange and condensation, and is converted into medium-temperature and medium-pressure liquid refrigerant or medium-temperature and medium-pressure gas-liquid two-phase mixed refrigerant. It then flows through the refrigerant bypass pipe 108 and the heat dissipation pipe 108a located at the bottom of the outdoor heat exchanger 105. Thus, the heat dissipation during the flow in the heat dissipation pipe 108a can be used to heat the bottom of the outdoor heat exchanger 105, preventing ice or frost from forming at the bottom of the outdoor heat exchanger 105.

[0039] In the case of only the air conditioning unit operating in heating mode in the water-cooled air conditioning unit system 1, the expansion valve 103 on the underfloor heating side remains open with a small opening. Under this condition, the high-temperature and high-pressure gaseous refrigerant generated by the compressor 101 flows through the four-way valve 109, then through the first shut-off valve 106, the second shut-off valve 107, and the indoor expansion valve 110, through the indoor circulation loop, and then back to the compressor 101 via the outdoor heat exchanger 105. At this time, some of the refrigerant that has undergone heat exchange in the water-side heat exchanger 102 flows through the refrigerant bypass pipe 108 at a higher temperature and pressure, thereby dissipating heat in the heat dissipation pipe 108a. Similarly, the heat dissipation during the flow in the heat dissipation pipe 108a can be used to heat the bottom of the outdoor heat exchanger 105, preventing ice or frost from forming at the bottom of the outdoor heat exchanger 105.

[0040] Furthermore, although this embodiment is described using the example of a heat dissipation pipe 108a being independently installed at the bottom of the outdoor heat exchanger 105, this application is not limited to this. This application does not limit the specific installation position of the heat dissipation pipe 108a relative to the outdoor heat exchanger 105. As long as the heat dissipation pipe 108a is a part of the refrigerant bypass pipe 108, and can use an external heat source (including but not limited to the same external heat source used by the outdoor heat exchanger 105) to heat the refrigerant flowing through the heat dissipation pipe 108a, it should fall within the protection scope of this application.

[0041] <Second Implementation Method>

[0042] Figure 3 This is a schematic diagram of the control module of the flue-cured water chiller system in the second embodiment of this application. The composition and connection method of the flue-cured water chiller system 1 in the second embodiment are the same as those in the first embodiment, and will not be described again here.

[0043] like Figure 3 As shown, the second embodiment of the above-ground water-cooled refrigerant unit system 1 of this application also includes an indoor heating mode activation control module 111, a refrigerant bypass adjustment module 112, an indoor cooling mode activation control module 113, and a floor heating mode activation control module 114.

[0044] The indoor heating mode activation control module 111 controls and instructs the air-cooled water-cooled unit system 1 to receive the instruction to activate indoor heating from the outside; the refrigerant bypass adjustment module 112 adjusts the opening degree of the floor heating side expansion valve 103 according to the operating conditions of the outdoor heat exchanger 105.

[0045] Specifically, the indoor heating mode activation control module 111 controls the air conditioning indoor heating unit system 1 to be activated independently. At this time, the underfloor heating side expansion valve 103 is kept open with a small opening. According to the settings of this embodiment, the opening of the underfloor heating side expansion valve 103 can be actively adjusted according to the operating conditions of the outdoor heat exchanger 105. For example, when the outdoor heat exchanger 105 is at a low outdoor temperature and has been working for a long time, and frost or ice forms, the opening of the underfloor heating side expansion valve 103 can be actively adjusted. The refrigerant with heat and a higher temperature and pressure can be actively introduced into the bottom of the outdoor heat exchanger 105 through the refrigerant bypass pipe 108 to prevent ice or frost from forming at the bottom of the outdoor heat exchanger 105.

[0046] Furthermore, the operating conditions of the outdoor heat exchanger 105 include at least the outlet refrigerant temperature or outlet refrigerant pressure of the outdoor heat exchanger 105.

[0047] Specifically, the refrigerant bypass adjustment module 112 determines the surface temperature of the outdoor heat exchanger 105 based on the outlet refrigerant temperature or outlet refrigerant pressure of the outdoor heat exchanger 105, thereby obtaining the frosting or icing status of the outdoor heat exchanger 105, and then actively adjusts the opening degree of the underfloor heating side expansion valve 103 according to the frosting or icing status of the outdoor heat exchanger 105.

[0048] In indoor cooling mode, the indoor cooling mode activation control module 113 controls and instructs the air-cooled water-cooled unit system 1 to accept the indoor cooling activation command from the outside, and controls the air-cooled water-cooled unit system 1 to operate in indoor cooling mode. At this time, the expansion valve 103 on the floor heating side remains closed.

[0049] In addition, when the underfloor heating mode is in operation, the underfloor heating mode activation control module 114 controls and instructs the Tianfu underfloor water unit system 1 to accept the instruction to activate the underfloor heating from the outside, controls the underfloor heating circulation loop to perform heating, and at the same time the underfloor heating side expansion valve 103 remains open.

[0050] Although this embodiment uses the indoor heating mode activation control module 111, the refrigerant bypass adjustment module 112, the indoor cooling mode activation control module 113, and the floor heating mode activation control module 114 as examples for explanation, it does not mean that each module must be an independent module. Multiple modules can be integrated into one module, as long as they have the corresponding functions, and all of them fall within the protection scope of this application.

[0051] <Third Implementation Method>

[0052] Figure 4 This is a schematic diagram illustrating the execution steps of the control method for the Tianfudi water unit system in the third embodiment of this application.

[0053] The flue gas water heater system 1 in the third embodiment of this application has the same composition and connection relationship as the flue gas water heater system 1 in the first and second embodiments, and will not be described again here.

[0054] like Figure 4 As shown, the control method of the refrigerant-cooled water chiller system 1 in this embodiment controls the refrigerant-cooled water chiller system 1. The control method includes at least: indoor heating mode activation step S1 and refrigerant bypass adjustment step S2.

[0055] In this embodiment, when the indoor heating mode of the local refrigerant-cooled water chiller system 1 is turned on independently, the indoor heating mode turn-on control module 111 executes the indoor heating mode turn-on step S1. The local refrigerant-cooled water chiller system 1 receives the indoor heating turn-on command from the outside and turns on the air conditioning indoor heating independently. The refrigerant bypass adjustment module 112 executes the refrigerant bypass adjustment step S2, adjusting the opening degree of the underfloor heating side expansion valve 103 according to the operating conditions of the outdoor heat exchanger 105.

[0056] Furthermore, the refrigerant bypass adjustment step S2 may also include the following sub-steps:

[0057] The outdoor heat exchanger refrigerant outlet pressure detection step detects the refrigerant outlet pressure of the outdoor heat exchanger 105 and feeds it back to the refrigerant bypass adjustment step S2.

[0058] The outdoor heat exchanger refrigerant outlet temperature detection step detects the refrigerant outlet temperature of the outdoor heat exchanger 105 and feeds it back to the refrigerant bypass adjustment step S2.

[0059] The outside air temperature detection step detects the outside air temperature and feeds it back to the refrigerant bypass adjustment step S2.

[0060] Specifically, when the refrigerant bypass adjustment module 112 executes the refrigerant bypass adjustment step S2, it detects the refrigerant outlet pressure or refrigerant outlet temperature of the outdoor heat exchanger 105, or detects the outside air temperature, to obtain the frosting or icing status of the outdoor heat exchanger 105, and accordingly actively adjusts the opening of the underfloor heating side expansion valve 103, and introduces the refrigerant with heat into the bottom of the outdoor heat exchanger 105 through the refrigerant bypass pipe 108, so as to prevent the bottom of the outdoor heat exchanger 105 from freezing or frosting when the air conditioner is used for heating alone.

[0061] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fluorinated water chiller system, comprising: The system comprises a compressor connected via refrigerant piping, a floor heating circulation loop including a water-side heat exchanger and a corresponding floor heating expansion valve, an indoor circulation loop including an indoor heat exchanger and a corresponding indoor expansion valve, and an outdoor heat exchanger, characterized in that it further includes: The refrigerant bypass pipeline is at least partially configured to correspond to the outdoor heat exchanger, with its first end connected to the water-side heat exchanger and its second end connected to the underfloor heating expansion valve.

2. The fluorine-to-water chiller system as described in claim 1, characterized in that, The portion of the refrigerant bypass pipe corresponding to the outdoor heat exchanger is located at the bottom of the outdoor heat exchanger.

3. The fluorinated water chiller system as described in claim 1 or 2, characterized in that, Also includes: The indoor heating mode activation control module controls and instructs the air-cooled water-cooled unit system to accept commands from the outside to activate indoor heating. The refrigerant bypass adjustment module adjusts the opening of the expansion valve on the floor heating side according to the operating conditions of the outdoor heat exchanger.

4. The fluorine-to-water chiller system as described in claim 3, characterized in that, The operating conditions of the outdoor heat exchanger include at least the outlet refrigerant temperature or outlet refrigerant pressure of the outdoor heat exchanger.

5. The natural gas-fired water-cooled unit system as described in claim 1, characterized in that, Also includes: The indoor cooling mode activation control module controls and instructs the air-cooled water chiller system to accept commands from the outside to activate indoor cooling.

6. The fluorine-to-water chiller system as described in claim 1, characterized in that, Also includes: The underfloor heating mode activation control module controls and instructs the Tianfu underfloor water unit system to accept commands from the outside to activate the underfloor heating mode.

7. A control method for a natural fluoride-water chiller system, comprising controlling the natural fluoride-water chiller system as described in any one of claims 1-6, characterized in that, include: In the indoor heating mode activation step, the air-cooled water-cooled unit system receives an external command to activate indoor heating. The refrigerant bypass adjustment step involves adjusting the opening of the expansion valve on the underfloor heating side according to the operating conditions of the outdoor heat exchanger.

8. The control method for the natural fluoride-water chiller system as described in claim 7, characterized in that, Also includes: The outdoor heat exchanger refrigerant outlet pressure detection step detects the refrigerant outlet pressure of the outdoor heat exchanger and feeds it back to the refrigerant bypass adjustment step.

9. The control method for the natural fluoride-water chiller system as described in claim 7, characterized in that, Also includes: The outdoor heat exchanger refrigerant outlet temperature detection step detects the refrigerant outlet temperature of the outdoor heat exchanger and feeds it back to the refrigerant bypass adjustment step.

10. The control method for the natural fluoride-water chiller system as described in claim 7, characterized in that, Also includes: The outside air temperature detection step detects the outside air temperature and feeds it back to the refrigerant bypass adjustment step.

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