Control method and control device for refrigerant distribution of Tianshi water unit and Tianshi water unit

Abstract

The invention provides a control method for refrigerant distribution of a Tianfluor water unit, a control device for executing the control method and the Tianfluor water unit using the control device. When the day fluorine floor water unit is started to operate in a single-open floor heating mode, according to the outdoor environment temperature, the comparison result of the low-pressure-side pressure of the compressor and the preset target low-pressure-side pressure, the comparison result of the exhaust superheat degree of the compressor and the specified exhaust superheat degree, and the parameters such as the temperature and the pressure of a refrigerant entering an indoor heat exchanger, the temperature of the refrigerant entering the indoor heat exchanger are calculated. And the opening of the indoor expansion valve is comprehensively controlled and adjusted. And it is guaranteed that when the Tianfluor ground water unit operates in the single-open ground heating mode, the circulation amount of refrigerants entering the indoor side heat exchanger is sufficient, and it is guaranteed that the refrigerants are not condensed in an air pipe in advance, and the reliability risk of lack of the refrigerants is avoided. And meanwhile, the problems that the indoor heating capacity is affected and the indoor comfort degree is reduced due to the fact that the refrigerant entering the floor heating circulation loop is less due to the fact that the opening degree of the indoor expansion valve is too large and the refrigerant entering the indoor heat exchanger is too large are solved.

Description

Technical Field

[0001] This application relates to the field of refrigeration / cooling equipment technology, specifically to a control method for refrigerant distribution in a water-cooled refrigeration unit, a control device for executing the control method, and a water-cooled refrigeration unit using the control device. Background Technology

[0002] Unlike common split-type air conditioning units, the integrated refrigerant-based water-cooled system is a dual-supply heat pump product for the central air conditioning and heating industries. It integrates a fully variable frequency refrigerant-based central air conditioning system and a water-based underfloor heating system into a single system through control technology, achieving dual functionality in one unit – central air conditioning and underfloor heating combined. The water-side heat exchanger of the integrated refrigerant-based water-cooled unit is integrated inside the outdoor unit. This means that when only the water-side heat exchanger is activated, the indoor unit is in standby mode, resulting in a significantly reduced refrigerant circulation volume in the indoor unit's refrigerant piping compared to split-type air conditioning units. In particular, when the ambient temperature is low, if the Tianfu water-cooled chiller unit is started in single-on underfloor heating mode, most of the refrigerant will return to the compressor through the water-side heat exchanger, and only a small portion of the refrigerant will return to the compressor through the refrigerant connection pipe. At the same time, when the ambient temperature is low, the temperature of the refrigerant piping outside the room is also low. After the compressor starts, the amount of refrigerant flowing through the compressor is small, and more refrigerant will remain in the gas pipe. Furthermore, due to the small amount of circulating refrigerant, the refrigerant return speed is slow, and a large amount of refrigerant and compressor oil will accumulate in the piping and indoor unit. The system's refrigerant circulation is insufficient, which may affect the reliability of the unit and even lead to compressor damage if it is operated for a long time. Summary of the Invention

[0003] This application aims to provide a control method and control device for refrigerant distribution in a refrigerated water chiller unit, and a refrigerated water chiller unit using the control method or having the control device, so as to at least solve or alleviate some of the problems existing in the prior art.

[0004] This application provides a control method for refrigerant distribution in a refrigerant-based water-cooled chiller unit. The applicable refrigerant-based water-cooled chiller unit 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 at least one indoor heat exchanger and a corresponding indoor expansion valve, and an outdoor heat exchanger. The control method includes: an indoor expansion valve opening pre-adjustment step, adjusting the indoor expansion valve to a preset indoor opening before compressor startup; a single-operation floor heating mode command receiving step, where the compressor receives a single-operation floor heating command from the outside; an ambient temperature detection step, detecting and acquiring the outdoor ambient temperature; and an indoor expansion valve standby opening adjustment step, adjusting the opening of the indoor expansion valve based on the outdoor ambient temperature acquired in the ambient temperature detection step.

[0005] In the optional technical solution, during the standby opening adjustment step of the indoor expansion valve, when the outdoor temperature is greater than the specified preset temperature, the indoor expansion valve is adjusted to the first opening; when the outdoor temperature is less than or equal to the specified preset temperature, the indoor expansion valve is adjusted to the second opening.

[0006] In the optional technical solutions, the control method for refrigerant distribution in the Tianfu-Difeng water chiller unit also includes: maintaining the opening of the indoor expansion valve, maintaining the opening of the indoor expansion valve at the first opening or the second opening, until the specified conditions are met.

[0007] In the optional technical solution, the specified condition is that the compressor's exhaust temperature reaches the predetermined exhaust temperature.

[0008] In the optional technical solution, the specified condition is that the opening degree of the indoor expansion valve is maintained at the first opening degree or the second opening degree for a specified duration.

[0009] In the optional technical solution, the control method for refrigerant distribution in the Tianfu-Difeng water chiller unit also includes: a subsequent control step, in which the opening of the indoor expansion valve is adjusted according to the outdoor ambient temperature obtained from the ambient temperature detection step.

[0010] In the optional technical solution, the matching relationship between the outdoor ambient temperature and the indoor expansion valve opening in the subsequent control steps is different from the matching relationship between the outdoor ambient temperature and the indoor expansion valve opening in the standby opening adjustment step of the indoor expansion valve.

[0011] In the optional technical solution, the control method for refrigerant distribution of the water-cooled air conditioning unit also includes: a compressor low-pressure value detection step, which detects and obtains the low-pressure side pressure of the compressor; a low-pressure value comparison step, which compares the low-pressure side pressure with the preset target low-pressure side pressure and outputs the low-pressure value comparison result; and a first adjustment step for the indoor expansion valve, which adjusts the opening degree of the indoor expansion valve according to the low-pressure value comparison result.

[0012] In the optional technical solutions, the control method for refrigerant distribution in the Tianfen-Dishui unit also includes: an exhaust superheat judgment step, which judges whether the exhaust superheat of the compressor reaches the specified exhaust superheat. When the exhaust superheat reaches the specified exhaust superheat and the low pressure value comparison result reaches the specified threshold, the first adjustment step of the indoor expansion valve is exited.

[0013] In the optional technical solutions, the threshold is specified to be greater than or equal to 0.

[0014] In the optional technical solutions, the Tianfu-based water-cooled unit also includes an indoor unit-side temperature sensor, which is installed on the refrigerant inlet side of the indoor heat exchanger to detect the refrigerant temperature entering the indoor heat exchanger in single-operation underfloor heating mode; and an indoor unit-side pressure sensor, which is installed on the refrigerant inlet side of the indoor heat exchanger to detect the refrigerant pressure entering the indoor heat exchanger in single-operation underfloor heating mode.

[0015] In the optional technical solution, the control method for refrigerant distribution in the Tianfu-Difeng water chiller unit also includes: a second adjustment step for the indoor expansion valve, which adjusts the opening of the indoor expansion valve according to the detection results of the indoor unit temperature sensor or the indoor unit pressure sensor.

[0016] In optional technical solutions, the refrigerant-cooled water chiller unit also includes a compressor discharge pressure sensor installed on the refrigerant outlet side of the compressor to detect the compressor's discharge pressure. The control method provided in this application further includes a compressor discharge pressure adjustment step, which adjusts the compressor discharge pressure according to the properties of the refrigerant pipeline from the compressor outlet to the indoor heat exchanger inlet.

[0017] In the optional technical solutions, the refrigerant piping properties should at least include the pipe length from the compressor outlet to the indoor heat exchanger inlet, the number of bends, and the pressure loss characteristic value.

[0018] Another aspect of this application provides a control device for a refrigerant-based water-cooled chiller unit. The refrigerant-based water-cooled chiller unit includes: a compressor connected via refrigerant pipes; a floor heating circulation loop including a water-side heat exchanger and a corresponding floor heating expansion valve; an indoor circulation loop including at least one indoor heat exchanger and a corresponding indoor expansion valve; and an outdoor heat exchanger. The control device provided in this application further includes: an indoor expansion valve opening pre-adjustment module, which adjusts the indoor expansion valve to a preset indoor opening degree before the compressor starts; a single-operation floor heating mode command receiving module, which receives a single-operation floor heating command from the outside; an ambient temperature detection module, which detects and acquires the outdoor ambient temperature; and an indoor expansion valve standby opening adjustment module, which adjusts the opening degree of the indoor expansion valve according to the outdoor ambient temperature acquired by the ambient temperature detection module.

[0019] Another aspect of this application provides a refrigerant-cooled water-cooled unit, including 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, an indoor circulation loop including at least one indoor heat exchanger and a corresponding indoor expansion valve, an outdoor heat exchanger, and a control device for the aforementioned refrigerant-cooled water-cooled unit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a fluorine-based water chiller unit in one embodiment of this application.

[0021] Figure 2 This is a schematic diagram illustrating the execution steps of a refrigerant distribution control method for a fluorinated water chiller unit according to one embodiment of this application.

[0022] Figure 3This is a schematic diagram illustrating the execution steps of a refrigerant distribution control method for a fluorinated water chiller unit according to one embodiment of this application.

[0023] Figure 4 This is a schematic diagram illustrating the execution steps of a refrigerant distribution control method for a fluorinated water chiller unit according to one embodiment of this application.

[0024] Figure 5 This is a schematic diagram of a fluorine-based water chiller unit in one embodiment of this application.

[0025] Figure 6 This is a schematic diagram illustrating the execution steps of a refrigerant distribution control method for a fluorinated water chiller unit according to one embodiment of this application.

[0026] Figure 7 This is a schematic diagram of a fluorine-based water chiller unit in one embodiment of this application.

[0027] Figure 8 This is a schematic diagram illustrating the execution steps of a refrigerant distribution control method for a fluorinated water chiller unit according to one embodiment of this application.

[0028] Figure 9 This is a schematic diagram of the control device module for refrigerant distribution in a Tianfu-Dishui water chiller unit according to one embodiment of this application.

[0029] Figure reference numerals: 1. Tianfu-Frequency Water-Based Heating Unit; 101. Compressor; 102. Water-Side Heat Exchanger; 103. Underfloor Heating Side Expansion Valve; 104. Underfloor Heating Circulation Loop; 105. Indoor Side Heat Exchanger; 106. Indoor Side Expansion Valve; 107. Indoor Side Circulation Loop; 108. Outdoor Side Heat Exchanger; 109. Indoor Unit Side Temperature Sensor; 110. Indoor Unit Side Pressure Sensor; 111. Compressor Discharge Pressure Sensor; 12. Control Device; 121. Indoor Side Expansion Valve Opening Pre-Adjustment Module; 122. Single-Open Underfloor Heating Mode Command Receiving Module; 123. Ambient Temperature Detection Module; 124. Indoor Side Expansion Valve Standby Opening Adjustment Module. Detailed Implementation

[0030] It should be noted that the following will use examples to illustrate the working principle, characteristics and advantages of a refrigerant distribution control method for a water-cooled chiller unit 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.

[0031] 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.

[0032] <First Implementation Method>

[0033] Figure 1 This is a schematic diagram of the fluoride-water chiller unit 1 in one embodiment of this application. (See attached diagram) Figure 1 As shown, the fluorinated water heater unit 1 involved in this embodiment includes: a compressor 101, a water-side heat exchanger 102, a floor heating-side expansion valve 103, a floor heating circulation loop 104, an indoor-side heat exchanger 105, an indoor-side expansion valve 106, an indoor-side circulation loop 107, and an outdoor-side heat exchanger 108.

[0034] like Figure 1 As shown, the compressor 101, the underfloor heating circulation loop 104, the indoor circulation loop 107, and the outdoor heat exchanger 108 are connected by refrigerant pipes. The underfloor heating circulation loop 104 includes at least a water-side heat exchanger 102 and a corresponding underfloor heating expansion valve 103. The indoor circulation loop 107 includes at least one indoor heat exchanger 105 and a corresponding indoor expansion valve 106.

[0035] Figure 1 The illustration uses two indoor heat exchangers 105, 105 and two indoor expansion valves 106, 106 respectively provided for the two indoor heat exchangers 105, 105 as an example. However, the embodiments of this application do not limit the number of indoor heat exchangers 105 and indoor expansion valves 106.

[0036] Figure 2 This is a schematic diagram illustrating the execution steps of the refrigerant distribution control method for a ground-to-ground water chiller unit according to one embodiment of this application. (See attached diagram.) Figure 2 As shown, the control method for refrigerant distribution in the air-cooled water-cooled unit involved in this embodiment includes: indoor expansion valve opening pre-adjustment step S1, single-on floor heating mode command acceptance step S2, ambient temperature detection step S3, and indoor expansion valve standby opening adjustment step S4.

[0037] In this embodiment, when receiving an external command, the Tianfu floor heating unit 1 prepares to start operating in single-operation floor heating mode. The indoor expansion valve opening pre-adjustment step S1 is executed, that is, before the compressor 101 starts, the indoor expansion valve 106 is adjusted to the preset indoor opening. After the indoor expansion valve 106 opens to the preset indoor opening, the single-operation floor heating mode command receiving step S2 is executed, controlling the compressor 101 to accept the floor heating single-operation command from the outside and operate in single-operation floor heating mode. After the compressor 101 starts, the ambient temperature detection step S3 is executed to detect and obtain the outdoor ambient temperature. After obtaining the outdoor ambient temperature, the indoor expansion valve standby opening adjustment step S4 is executed, adjusting the opening of the indoor expansion valve 106 according to the outdoor ambient temperature obtained in the ambient temperature detection step S3.

[0038] Through the above implementation method, when the Tianfu-based water-cooled chiller unit 1 is turned on in single-operation underfloor heating mode, the opening degree of the indoor expansion valve 106 is at the indoor preset opening degree. Preferably, the indoor preset opening degree is greater than the opening degree of the indoor expansion valve 106 when the Tianfu-based water-cooled chiller unit 1 is operating normally in single-operation underfloor heating mode. When the indoor expansion valve 106 is at the indoor preset opening degree, the compressor 101 is then controlled to receive the underfloor heating single-operation command from the outside and start operating in single-operation underfloor heating mode. At this time, if the opening degree of the indoor expansion valve 106 is too small, most of the refrigerant will flow back to the compressor 101 through the underfloor heating circulation loop 104, and only a small portion of the refrigerant will flow back to the compressor 101 through the indoor circulation loop 107. When the ambient temperature is low, the high-temperature gaseous refrigerant in some of the refrigerant pipes arranged on the outdoor side will condense from the gaseous state into a liquid state and remain, resulting in insufficient refrigerant circulation in the underfloor heating circulation loop 104. This can lead to a slow refrigerant return flow. If a lot of refrigerant and compressor oil accumulate in the indoor circulation loop 107, the refrigerant circulation volume in the underfloor heating circulation loop 104 of the air-cooled water-cooled unit 1 will be insufficient when the unit is started in single-on underfloor heating mode. This will result in low return pressure of the compressor 101, which will affect the reliability of the unit after a long period of operation and may even damage the compressor 101 in severe cases.

[0039] Therefore, according to the embodiments of this application, when the Tianfu water-cooled unit 1 is turned on in single-on floor heating mode, the opening degree of the indoor expansion valve 106 is at a suitable indoor preset opening degree, thereby ensuring that the refrigerant flowing through the floor heating circulation loop 104 and the indoor circulation loop 107 is reasonably distributed during the floor heating start-up process. This ensures that the floor heating circulation loop 104 has sufficient refrigerant circulation volume while avoiding the problem of refrigerant deposition in the indoor circulation loop 107, which would lead to excessively low return pressure of the compressor 101 and insufficient refrigerant circulation volume in the floor heating circulation loop 104.

[0040] Specifically, in the standby opening adjustment step S4 of the indoor expansion valve, if the outdoor ambient temperature is detected to be low, in other words, if the refrigerant in the outdoor refrigerant pipeline (including part of the indoor circulation loop 107) is prone to condensing from a gaseous state into a liquid state and stagnating, then the opening of the indoor expansion valve 106 can be appropriately increased to appropriately increase the refrigerant flow through the indoor circulation loop 107, thus avoiding the problem of refrigerant stagnation in the outdoor refrigerant pipeline, which would lead to a reduction in the amount of refrigerant circulating in the entire air-cooled water chiller unit 1. Conversely, if, based on the detected outdoor ambient temperature, it is determined that the refrigerant in the outdoor refrigerant pipeline (including part of the indoor circulation loop 107) is not prone to condensing from a gaseous state into a liquid state and stagnating, then the opening of the indoor expansion valve 106 can be maintained or adjusted slightly.

[0041] Although the first embodiment of this application describes the indoor expansion valve opening pre-adjustment step S1 as an example of receiving an external instruction and preparing to start the air conditioning unit 1 in single-operation underfloor heating mode, the indoor expansion valve opening pre-adjustment step S1 of this application can also be executed after the air conditioning unit 1 has been shut down previously, or based on other external conditions such as external ambient temperature, indoor ambient temperature or humidity, or the indoor expansion valve opening can be set to a fixed indoor preset opening based on the model and settings of the air conditioning unit 1. There are no particular restrictions on the timing of the indoor expansion valve opening pre-adjustment step S1, as long as the indoor expansion valve opening is at the indoor preset opening before the compressor 101 starts in single-operation underfloor heating mode.

[0042] <Second Implementation Method>

[0043] The refrigerant distribution control method of the second embodiment of this application for a water-cooled refrigeration unit is the same as the refrigerant distribution control method of the above-mentioned embodiment of this application for a water-cooled refrigeration unit. The same names or symbols are used to describe the same content, and will not be repeated here.

[0044] In a preferred embodiment of this application, in the standby opening adjustment step S4 of the indoor expansion valve, when the outdoor temperature is greater than a predetermined preset temperature, the indoor expansion valve 106 is adjusted to a first opening; when the outdoor temperature is less than or equal to the predetermined preset temperature, the indoor expansion valve 106 is adjusted to a second opening. Preferably, the second opening is greater than the first opening and also greater than the opening of the indoor expansion valve 106 when the refrigerant-based underfloor heating unit 1 is operating normally in single-on underfloor heating mode.

[0045] Specifically, when performing the indoor expansion valve standby opening adjustment step S4, the opening of the indoor expansion valve 106 is controlled according to the outdoor temperature. This ensures that when the refrigerant-cooled water heater unit 1 is turned on at different ambient temperatures, the amount of refrigerant circulating in the compressor 101 to the underfloor heating circulation loop 104 and the indoor circulation loop 107 matches the ambient temperature. This ensures that the return pressure and exhaust temperature of the compressor 101 increase rapidly, avoiding the problem that when the refrigerant-cooled water heater unit 1 is started in single-on underfloor heating mode, insufficient refrigerant circulation in the compressor 101 will prevent the return pressure and exhaust temperature of the compressor 101 from rising rapidly, thus causing damage to the compressor 101.

[0046] Specifically, when the detected outdoor temperature exceeds the preset temperature, the indoor expansion valve 106 is adjusted to a first opening degree, preferably greater than the opening degree of the indoor expansion valve 106 when the refrigerant-cooled water heater unit 1 is operating normally in single-operation underfloor heating mode. After the refrigerant-cooled water heater unit 1 starts, the refrigerant remaining in the indoor heat exchanger 105 flows to the compressor 101 through the indoor expansion valve 106. Under the action of the compressor 101, the exhaust temperature at the outlet of the compressor 101 rapidly rises to the target temperature, avoiding the problem of low return gas pressure affecting the stability of the unit.

[0047] When the detected outdoor temperature is less than or equal to a preset temperature, the indoor expansion valve 106 is adjusted to a second opening degree, preferably greater than the first opening degree. When the outdoor temperature is lower, for example, below the preset temperature, the indoor expansion valve 106 is opened to a larger second opening degree. This prevents the refrigerant flowing through the indoor circulation loop 107 from condensing into a liquid state and remaining in the loop. Instead, it flows more easily to the compressor 101 through the indoor expansion valve 106. This ensures sufficient refrigerant circulation when the air-cooled unit 1 is started in single-operation underfloor heating mode. Consequently, the return pressure and exhaust temperature of the compressor 101 can be rapidly increased, preventing refrigerant from accumulating in the indoor circulation loop 107, which could lead to excessively low return pressure, poor underfloor heating performance, or even affect the compressor 101's lifespan and the unit's reliability.

[0048] It should be noted that this application does not limit the specific values ​​of the first opening degree and the second opening degree. Different first opening degrees and second opening degrees set according to the operating conditions of the Tianfudi water unit 1, outdoor ambient temperature or humidity, etc., should all be included in the scope of this application.

[0049] Figure 3 This is a schematic diagram illustrating the execution steps of the refrigerant distribution control method for a ground-to-ground water chiller unit according to one embodiment of this application. (See attached diagram.) Figure 3 As shown, the control method for refrigerant distribution in the Tianfu-Dishui unit further includes a step S5 of maintaining the opening of the indoor expansion valve, based on the first embodiment, to maintain the opening of the indoor expansion valve 106 at the first opening or the second opening until the specified conditions are met.

[0050] As a preferred embodiment of this application, the specified condition may be that the exhaust temperature of the compressor 101 reaches a predetermined exhaust temperature.

[0051] Specifically, when the indoor expansion valve opening pre-adjustment step S1 controls the indoor expansion valve 106 to adjust to the first or second opening and maintain it at the first or second opening, the exhaust temperature of the compressor 101 is detected and compared with the predetermined exhaust temperature. When the exhaust temperature of the compressor 101 reaches the predetermined exhaust temperature, it is determined that the compressor 101 has been successfully started and the exhaust temperature has a certain degree of superheat. At this time, the ambient temperature detection step S3 and the indoor expansion valve standby opening adjustment step S4 are executed. Based on the outdoor ambient temperature, the opening of the indoor expansion valve 106 is adjusted again, and this opening is used as the standby opening of the indoor expansion valve 106 when the air-cooled water heater unit 1 is running in single-on underfloor heating mode. Through the above implementation method, the opening degree of the indoor expansion valve 106 is controlled and determined based on the comparison result between the exhaust temperature of the compressor 101 and the predetermined exhaust temperature. This avoids the problem that after the compressor 101 is successfully started, the indoor expansion valve 106 remains at the first or second opening degree, causing excessive refrigerant to continuously flow into the indoor circulation loop 107, while less refrigerant flows into the underfloor heating circulation loop 104. This results in a reduction in the heat exchange on the underfloor heating side when the refrigerant-based water-cooled unit 1 is running in single-operation underfloor heating mode, thus affecting indoor comfort.

[0052] As another preferred embodiment of this application, the specified condition may be that the duration for which the opening degree of the indoor expansion valve 106 is maintained at the first opening degree or the second opening degree reaches a specified duration.

[0053] Specifically, when the indoor expansion valve 106 maintains the first opening or the second opening for a specified time, the ambient temperature detection step S3 and the indoor expansion valve standby opening adjustment step S4 are executed. Based on the outdoor ambient temperature, the opening of the indoor expansion valve 106 is adjusted again, and this opening is used as the standby opening of the indoor expansion valve 106 when the Tianfen-Difeng water heater unit 1 is running in single-on underfloor heating mode. Through the above implementation method, when the indoor expansion valve 106 maintains the first opening or the second opening for a specified period of time, even if the detected exhaust temperature of the compressor 101 does not reach the predetermined exhaust temperature after the specified period of time, it can still be determined that the compressor 101 has started normally, and then the ambient temperature detection step S3 and the indoor expansion valve standby opening adjustment step S4 are executed. This avoids the problem that the detected exhaust temperature of the compressor 101 may not reach the predetermined exhaust temperature for a long time due to the influence of the outdoor ambient temperature or the failure of the compressor 101 exhaust temperature detection module, which would cause the indoor expansion valve 106 to maintain the first opening or the second opening for a long time, resulting in too much refrigerant flowing into the indoor circulation loop 107 and less refrigerant flowing into the underfloor heating circulation loop 104. This would reduce the heat exchange on the underfloor heating side when the Tianfen-Groundwater Unit 1 is running in single-on underfloor heating mode, thus affecting indoor comfort.

[0054] As a preferred embodiment of this application, the control method for refrigerant distribution in the Tianfu-Difeng water chiller unit further includes a subsequent control step S6, which adjusts the opening of the indoor expansion valve 106 based on the outdoor ambient temperature obtained in the ambient temperature detection step S3.

[0055] In a preferred embodiment of this application, the matching relationship between the outdoor ambient temperature and the opening degree of the indoor expansion valve 106 in the subsequent control step S6 is different from the matching relationship between the outdoor ambient temperature and the opening degree of the indoor expansion valve 106 in the standby opening degree adjustment step S4.

[0056] Specifically, in the subsequent control step S6, the outdoor ambient temperature can be divided into different intervals, such as interval A1, interval A2, interval A3, interval A4, and interval A5, and different opening degrees of the indoor expansion valve 106 can be matched according to different intervals, such as opening degree B1, opening degree B2, opening degree B3, opening degree B4, and opening degree B5. After it is determined that the compressor 101 has been successfully started, assuming that the detected outdoor ambient temperature is within the range of interval A1, the indoor expansion valve 106 is adjusted to opening degree B1, and the opening degree B1 is maintained as the standby opening degree of the indoor expansion valve 106 when the air-cooled water-cooled unit 1 is running in single-on floor heating mode. This system adjusts the opening of the indoor expansion valve 106 based on the outdoor ambient temperature, controlling the refrigerant flow through the indoor circulation loop 107. This prevents excessive refrigerant from flowing into the indoor circulation loop 107 when the expansion valve 106 is too open, resulting in insufficient refrigerant flowing into the underfloor heating circulation loop 104. This would reduce the heat exchange on the underfloor heating side when the air-cooled unit 1 operates in single-operation underfloor heating mode, affecting indoor comfort. Conversely, it also prevents excessive refrigerant from condensing and depositing in the piping and indoor unit of the indoor circulation loop 107 when the expansion valve 106 is too small. This would lead to insufficient refrigerant circulation throughout the system, low return pressure of the compressor 101, affecting the reliability of the air-cooled unit 1, and potentially even damaging the compressor 101.

[0057] Although the subsequent control step S6 in this application is described as dividing the outdoor ambient temperature into intervals A1, A2, A3, A4, and A5, and setting corresponding indoor expansion valve openings B1, B2, B3, B4, and B5, this application is not limited to this. The division of more or fewer temperature intervals and the setting of indoor expansion valve openings according to different outdoor ambient temperature ranges, the configuration of the fluorinated water unit 1, and its operating conditions should also be included within the scope of protection of this application.

[0058] <Third Implementation Method>

[0059] The refrigerant distribution control method of the third embodiment of the present application for the water-cooled refrigerant chiller unit is the same as the refrigerant distribution control method of the above-mentioned embodiments of the present application for the water-cooled refrigerant chiller unit. The same names or symbols are used to describe the same content, and will not be repeated here.

[0060] Based on the first embodiment, that is, when the refrigerant-based underfloor heating unit 1 is turned on in single-on underfloor heating mode, the opening degree of the indoor expansion valve 106 is first adjusted according to the outdoor ambient temperature obtained in the ambient temperature detection step S3. Preferably, in this embodiment, the outdoor ambient temperature is divided into multiple ranges, and different initial opening degrees of the indoor expansion valve 106 are matched for different outdoor ambient temperature ranges. Moreover, the lower the outdoor ambient temperature, the larger the opening degree of the matched indoor expansion valve 106.

[0061] When the outdoor ambient temperature is low, the indoor expansion valve 106 is opened to its maximum opening degree; when the outdoor ambient temperature is high, the indoor expansion valve 106 is opened to its minimum opening degree. Specifically, the outdoor ambient temperature is divided into four ranges using 7℃, -7℃, and -15℃ as boundaries. When the detected outdoor ambient temperature is >7℃, the indoor expansion valve 106 is opened to 96P; when the detected outdoor ambient temperature is -7℃ < ≤7℃, the indoor expansion valve 106 is opened to 128P; when the detected outdoor ambient temperature is -15℃ < ≤ -7℃, the indoor expansion valve 106 is opened to 156P; and when the detected outdoor ambient temperature is ≤ -15℃, the indoor expansion valve 106 is opened to 200P.

[0062] Through the above implementation method, when the Tianfu-based water-cooled chiller unit 1 is turned on at different outdoor ambient temperatures, the refrigerant circulation volume of the compressor 101 matches the outdoor ambient temperature. The return gas pressure and discharge temperature of the compressor 101 increase rapidly, avoiding the problem of insufficient refrigerant circulation in the compressor 101 when the Tianfu-based water-cooled chiller unit 1 is started in single-operation underfloor heating mode, which would cause the compressor 101 to fail to reach the preset return gas pressure and discharge temperature, resulting in compressor damage. It also avoids the problem of the indoor expansion valve 106 maintaining a large initial opening when the outdoor ambient temperature is high, leading to a refrigerant volume participating in the circulation exceeding the required refrigerant volume, resulting in reduced heat exchange on the underfloor heating side and increased energy consumption.

[0063] Although the embodiments of this application use 7℃, -7℃, and -15℃ as boundaries to divide the outdoor ambient temperature into four intervals as an example, this application is not limited to this. Other settings, such as using other temperatures as boundaries or dividing the outdoor ambient temperature into more or fewer intervals, should be included within the protection scope of this application, depending on the indoor and outdoor environmental conditions of different regions, the different operating conditions of the fluorine-water chiller unit 1, etc.

[0064] Although the embodiments of this application use 96P, 128P, 156P, and 200P as examples of the initial opening of the indoor expansion valve 106 corresponding to different outdoor ambient temperature ranges, this application is not limited to this. Other openings used as the initial opening of the indoor expansion valve 106 according to different regional indoor and outdoor environmental conditions and different operating conditions of the fluorinated water unit 1 should all be included within the protection scope of this application.

[0065] Figure 4 This is a schematic diagram illustrating the execution steps of the refrigerant distribution control method for a ground-to-ground water chiller unit according to one embodiment of this application. (See attached diagram.) Figure 4 As shown, as a preferred embodiment of this application, this embodiment differs from the control method for refrigerant distribution in the first or second embodiment described above in that it further includes, on the basis of the first or second embodiment, the following steps: compressor low pressure detection step S7, low pressure comparison step S8, indoor expansion valve first adjustment step S9, and exhaust superheat judgment step S10.

[0066] In the standby opening adjustment step S4 of the indoor expansion valve, after adjusting the indoor expansion valve 106 to a matching opening degree for a certain period of time based on the outdoor ambient temperature obtained in the ambient temperature detection step S3, the compressor low-pressure value detection step S7 is executed to detect and obtain the low-pressure side pressure Ps of the compressor 101. Simultaneously, the low-pressure value comparison step S8 is executed to compare the real-time detected low-pressure side pressure Ps with the preset target low-pressure side pressure Psd, and output the comparison result. After obtaining the low-pressure value comparison result, the first adjustment step S9 of the indoor expansion valve is executed, that is, the opening degree of the indoor expansion valve 106 is adjusted according to the low-pressure value comparison result.

[0067] Specifically, on the same day, the refrigerant-cooled underfloor heating unit 1 is turned on in single-on underfloor heating mode. After adjusting the indoor expansion valve 106 to a matching opening degree based on the outdoor ambient temperature for a certain period of time, the low-pressure side pressure Ps is detected and compared with the target low-pressure side pressure Psd. Based on the comparison result, the opening degree of the indoor expansion valve 106 is further adjusted. For example, when Ps-Psd≥0.3, the opening degree of the indoor expansion valve 106 is reduced by 16P; when 0.1≤Ps-Psd<0.3, the opening degree of the indoor expansion valve 106 is reduced by 8P. That is, the opening degree of the indoor expansion valve 106 is appropriately reduced according to the degree to which the low-pressure side pressure of the compressor 101 is higher than the target low-pressure side pressure. When -0.1 ≤ Ps - Psd < 0.1, meaning the low-pressure side pressure of compressor 101 is approximately near the target low-pressure side pressure, the opening of indoor expansion valve 106 is deemed to meet the required opening, and no further adjustment is made. When -0.3 ≤ Ps - Psd < -0.1, the opening of indoor expansion valve 106 is increased by 8P. When Ps - Psd < -0.3, the opening of indoor expansion valve 106 is increased by 16P. That is, based on the degree to which the measured low-pressure side pressure of compressor 101 deviates from the target low-pressure side pressure, the opening of indoor expansion valve 106 is appropriately increased to improve the low-pressure side pressure of compressor 101 and ensure the normal operation of the underfloor heating circulation loop 104 of the refrigerant-based water heater unit 1.

[0068] Preferably, after the indoor expansion valve 106 is further adjusted by performing the first adjustment step S9 of the indoor expansion valve, the first adjustment step S9 of the indoor expansion valve is performed again after a certain period of time. By performing the further adjustment of the indoor expansion valve 106 multiple times, the low-pressure side pressure is made closer to and kept stable at the preset target low-pressure side pressure.

[0069] Through the above implementation method, after the indoor expansion valve 106 operates at its initial opening for a certain period of time, the opening of the indoor expansion valve 106 is further adjusted according to the low pressure value comparison result. At the same time, by repeatedly executing the first adjustment step S9 of the indoor expansion valve, the refrigerant circulation volume of the water-cooled refrigerant chiller unit 1 is made closer to the refrigerant circulation volume required by the system under the current operating conditions, and the low pressure value is closer to and maintained at the preset target low pressure value. This avoids the problem of compressor 101 being damaged due to excessively low low pressure value, or the heat exchange effect of the water-cooled refrigerant chiller unit 1 being reduced and energy consumption increasing due to excessively high low pressure value.

[0070] Although the embodiments of this application illustrate the following examples: when Ps-Psd≥0.3, the opening of the indoor expansion valve 106 is reduced by 16P; when 0.1≤Ps-Psd<0.3, the opening of the indoor expansion valve 106 is reduced by 8P; when -0.1≤Ps-Psd<0.1, the initial opening of the indoor expansion valve 106 is determined to meet the required opening, and no further adjustment is made; when -0.3≤Ps-Psd<-0.1, the opening of the indoor expansion valve 106 is increased by 8P; and when Ps-Psd<-0.3, the opening of the indoor expansion valve 106 is increased by 16P, this application is not limited to these examples. Different pressure value comparison result ranges or different indoor expansion valve 106 opening adjustment values ​​may be selected based on different regional indoor and outdoor environmental conditions and different operating conditions of the refrigerated water unit 1, and these should all be included within the scope of protection of this application.

[0071] As a preferred embodiment of this application, such as Figure 4 As shown, after executing the first adjustment step S9 of the indoor expansion valve to make the low-pressure side pressure closer to the preset target low-pressure side pressure, the exhaust superheat judgment step S10 is executed to determine whether the exhaust superheat of the compressor 101 has reached the specified exhaust superheat. When the exhaust superheat is determined to have reached the specified exhaust superheat and the low-pressure value comparison result reaches the specified threshold, the control exits the first adjustment step S9 of the indoor expansion valve. The specified threshold is preferably greater than or equal to 0.

[0072] Through the above implementation method, taking into account the comparison results of exhaust superheat and low pressure, when it is determined that the exhaust superheat reaches the specified exhaust superheat and the low pressure comparison result reaches the specified threshold, it is determined that the opening degree of the indoor expansion valve 106 is the optimal opening degree when the Tianfu-Difeng water-cooled unit 1 is running in single-on underfloor heating mode. The system refrigerant circulation volume matches the operating conditions of the Tianfu-Difeng water-cooled unit 1, avoiding the accumulation of refrigerant in the indoor circulation loop 107, which would result in insufficient system refrigerant circulation volume. At the same time, it also reduces the possibility of incompletely evaporated refrigerant returning to the compressor 101 and causing damage to the compressor 101.

[0073] Although the threshold value is preferably greater than or equal to 0 in this embodiment, this application is not limited to this. Any setting that can determine that the low-pressure side pressure is close to the preset target low-pressure side pressure, such as -0.1≤Ps-Psd<0.1, should be included in the protection scope of this application.

[0074] Although this embodiment is described using the single-on underfloor heating mode of the Tianfu water-cooled unit 1 as an example, this application is not limited thereto. When the Tianfu water-cooled unit 1 switches from defrosting mode to single-on underfloor heating mode, the setting of adjusting the opening degree of the indoor expansion valve 106 through the above embodiment should also be included in the protection scope of this application.

[0075] <Fourth Implementation Method>

[0076] The refrigerant distribution control method of the fourth embodiment of the present application for the water-cooled refrigerant chiller unit is the same as the refrigerant distribution control method of the above-mentioned embodiments of the present application for the water-cooled refrigerant chiller unit. The same names or symbols are used to describe the same content, and will not be repeated here.

[0077] Figure 5 This is a schematic diagram of the fluoride-water chiller unit 1 in one embodiment of this application. (See attached diagram) Figure 5 As shown, the difference between the fluorinated water chiller unit 1 in this embodiment and the fluorinated water chiller unit 1 in the above embodiment is that, based on the fluorinated water chiller unit 1 in the above embodiment, it also includes: an indoor unit side temperature sensor 109 and an indoor unit side pressure sensor 110.

[0078] The indoor unit side temperature sensor 109 and the indoor unit side pressure sensor 110 are both installed on the refrigerant inlet side of the indoor heat exchanger 105. The indoor unit side temperature sensor 109 is used to detect the temperature of the refrigerant entering the indoor heat exchanger 105 in the single-operation underfloor heating mode of the water-cooled refrigerant system 1, and the indoor unit side pressure sensor 110 is used to detect the pressure of the refrigerant entering the indoor heat exchanger 105 in the single-operation underfloor heating mode of the water-cooled refrigerant system 1.

[0079] Figure 6 This is a schematic diagram illustrating the execution steps of the refrigerant distribution control method for a ground-to-ground water chiller unit according to one embodiment of this application. (See attached diagram.) Figure 6 As shown, the fourth embodiment differs from the control method for refrigerant distribution in the above embodiments in that it further includes: a second adjustment step S11 for the indoor expansion valve.

[0080] After executing the exhaust superheat judgment step S10, and controlling the air-cooled water chiller unit 1 to exit the first adjustment step S9 of the indoor side expansion valve based on the comprehensive comparison result of exhaust superheat and the low pressure value, the second adjustment step S11 of the indoor side expansion valve is executed. In the second adjustment step S11 of the indoor side expansion valve, the opening degree of the indoor side expansion valve 106 is adjusted according to the detection result of the indoor unit side temperature sensor 109 or the indoor unit side pressure sensor 110.

[0081] Specifically, after the Tianfu-based water heater 1 exits the first adjustment step S9 of the indoor expansion valve, the temperature of the refrigerant entering the indoor heat exchanger 105 of the Tianfu-based water heater 1 in the single-on floor heating mode is detected by the indoor unit side temperature sensor 109, and the pressure of the refrigerant entering the indoor heat exchanger 105 of the Tianfu-based water heater 1 in the single-on floor heating mode is detected by the indoor unit side pressure sensor 110, and the refrigerant saturation temperature at the corresponding pressure is obtained based on the detected refrigerant pressure. The refrigerant superheat entering the indoor heat exchanger 105 is obtained by comparing the refrigerant temperature with the refrigerant saturation temperature. The refrigerant superheat entering the indoor heat exchanger 105 is then compared with a preset refrigerant superheat range. If the refrigerant superheat is higher than the preset refrigerant superheat range, the opening of the indoor expansion valve 106 is reduced. If the refrigerant superheat is lower than the preset refrigerant superheat range, the opening of the indoor expansion valve 106 is increased. If the refrigerant superheat matches the preset refrigerant superheat range, the opening of the indoor expansion valve 106 is determined to meet the current operating conditions of the air-cooled water chiller unit 1, and the opening of the indoor expansion valve 106 is not adjusted.

[0082] Preferably, after further adjusting the indoor expansion valve 106 by executing the second adjustment step S11, the second adjustment step S11 is executed again after a certain interval. Through multiple further adjustments to the indoor expansion valve 106, the superheat of the refrigerant entering the indoor heat exchanger 105 is matched with the preset refrigerant superheat range. This ensures that when the air-cooled water-cooled unit 1 operates in single-operation underfloor heating mode, the refrigerant entering the indoor heat exchanger 105 has sufficient superheat, preventing refrigerant condensation and deposition in the gas pipes, thus avoiding the risk of refrigerant shortage in the underfloor heating circulation loop 104 during single-operation underfloor heating mode. It also avoids the problem of excessive opening of the indoor expansion valve 106, resulting in too much refrigerant entering the indoor heat exchanger 105 and insufficient refrigerant entering the underfloor heating circulation loop 104, which affects indoor heating capacity and reduces indoor comfort.

[0083] It should be noted that this application does not limit the method of obtaining the refrigerant saturation temperature at the corresponding pressure based on the refrigerant pressure. Methods such as consulting the built-in refrigerant pressure and refrigerant saturation temperature table at the corresponding pressure should also be included within the scope of protection of this application.

[0084] <Fifth Implementation Method>

[0085] The refrigerant distribution control method of the fifth embodiment of the present application for the water-cooled refrigerant chiller unit is the same as the refrigerant distribution control method of the above-mentioned embodiments of the present application for the water-cooled refrigerant chiller unit. The same names or symbols are used to describe the same content, and will not be repeated here.

[0086] Figure 7 This is a schematic diagram of the fluoride-water chiller unit 1 in one embodiment of this application. (See attached diagram) Figure 7 As shown, the difference between the refrigerant-cooled water chiller unit 1 in this embodiment and the refrigerant-cooled water chiller unit 1 in the above embodiment is that, based on the refrigerant-cooled water chiller unit 1 in the above embodiment, it also includes a compressor discharge pressure sensor 111 installed on the refrigerant outlet side of the compressor 101 to detect the discharge pressure of the compressor 101.

[0087] Figure 8 This is a schematic diagram illustrating the execution steps of the refrigerant distribution control method for a ground-to-ground water chiller unit according to one embodiment of this application. (See attached diagram.) Figure 8 As shown, the fifth embodiment differs from the control method for refrigerant distribution in the above embodiments in that it further includes a compressor exhaust pressure adjustment step S12.

[0088] When the exhaust superheat judgment step S10 is executed, and the exhaust superheat comparison result or the low pressure value comparison result is considered, the Tianfen-Dishui unit 1 is controlled to exit the first adjustment step S9 of the indoor side expansion valve. Then, the compressor exhaust pressure adjustment step S12 is executed. Based on the refrigerant pipeline properties from the compressor 101 outlet to the indoor side heat exchanger 105 inlet, the opening of the indoor side expansion valve 106 is controlled to achieve the purpose of adjusting the exhaust pressure of the compressor 101.

[0089] As a preferred embodiment of this application, the refrigerant piping properties include at least the pipe length, number of bends, and pressure loss characteristic value from the compressor 101 outlet to the indoor heat exchanger 105 inlet.

[0090] Specifically, after the Tianfu-based water heater unit 1 exits the first adjustment step S9 of the indoor expansion valve, the compressor discharge pressure of the Tianfu-based water heater unit 1 in single-operation floor heating mode is detected by the compressor discharge pressure sensor 111. At the same time, based on the refrigerant pipeline attributes from the compressor 101 outlet to the indoor heat exchanger 105 inlet recorded during installation or design, such as the number of bends and the pressure loss characteristic value per meter of pipe length, the preset value of the pressure drop per meter of pipe length of refrigerant flowing from the compressor 101 outlet to the indoor heat exchanger 105 inlet is calculated. Taking into account the pipe length corresponding to each indoor heat exchanger 105, the pipe pressure drop corresponding to each indoor heat exchanger 105 is obtained. By comparing the discharge pressure of the compressor 101 with the pipe pressure drop corresponding to each indoor heat exchanger 105, the refrigerant pressure at the indoor heat exchanger 105 inlet is obtained. The refrigerant pressure entering the indoor heat exchanger 105 is compared with the preset refrigerant pressure range. If the refrigerant pressure is higher than the preset refrigerant pressure range, the opening of the indoor expansion valve 106 is reduced. If the refrigerant pressure is lower than the preset refrigerant pressure range, the opening of the indoor expansion valve 106 is increased. If the refrigerant pressure matches the preset refrigerant pressure range, it is determined that the opening of the indoor expansion valve 106 meets the current operating conditions of the air-cooled water chiller unit 1, and the opening of the indoor expansion valve 106 is not adjusted.

[0091] Preferably, after executing the compressor discharge pressure adjustment step S12 to further adjust the indoor expansion valve 106, the compressor discharge pressure adjustment step S12 is executed again after a certain interval. Through multiple further adjustments to the indoor expansion valve 106, the refrigerant pressure entering the indoor heat exchanger 105 is matched with the preset refrigerant pressure range. This ensures that when the water-cooled refrigerant system 1 operates in single-operation underfloor heating mode, the refrigerant circulation volume entering the indoor heat exchanger 105 is sufficient, preventing the refrigerant from prematurely condensing and depositing in the gas pipes, thus avoiding the risk of refrigerant shortage in the underfloor heating circulation loop 104 during single-operation underfloor heating mode. It also avoids the problem of excessive opening of the indoor expansion valve 106, resulting in too much refrigerant entering the indoor heat exchanger 105 and insufficient refrigerant entering the underfloor heating circulation loop 104, which affects indoor heating capacity and reduces indoor comfort.

[0092] Although the embodiments of this application calculate the preset value of the pressure drop per meter of pipe length of refrigerant flowing from the outlet of compressor 101 to the inlet of indoor heat exchanger 105 by refrigerant pipe properties, and then calculate the refrigerant pressure at the inlet of each indoor heat exchanger 105 by taking into account the pipe length corresponding to each indoor heat exchanger 105, this application is not limited to this. The setting of the refrigerant pressure at the inlet of the corresponding indoor heat exchanger 105 by parameters such as pipe pressure drop correction under different exhaust pressures should also be included in the protection scope of this application.

[0093] <Sixth Implementation Method>

[0094] The sixth embodiment of this application provides a control device 12 for refrigerant distribution in a water-cooled air conditioning unit. In this embodiment, the same names or symbols are used to describe the control method for refrigerant distribution in a water-cooled air conditioning unit as described in the above embodiments of this application. They are all the same content and will not be repeated here.

[0095] Figure 9 This is a schematic diagram of the control device module for refrigerant distribution in a fluorinated water chiller unit according to one embodiment of this application, as shown below. Figure 9 As shown, the control device 12 for refrigerant distribution in the air-cooled water-cooled unit involved in this embodiment includes: an indoor expansion valve opening pre-adjustment module 121, a single-on floor heating mode command receiving module 122, an ambient temperature detection module 123, and an indoor expansion valve standby opening adjustment module 124.

[0096] In this embodiment, when the refrigerant-cooled water heater unit 1 is started in single-operation underfloor heating mode, the indoor expansion valve opening pre-adjustment module 121 executes the indoor expansion valve opening pre-adjustment step S1, adjusting the indoor expansion valve 106 to the preset indoor opening before the compressor 101 starts. After the indoor expansion valve 106 opens to the preset indoor opening, the single-operation underfloor heating mode command receiving module 122 executes the single-operation underfloor heating mode command receiving step S2, controlling the compressor 101 to receive the underfloor heating single-operation command from the outside and operate in single-operation underfloor heating mode. After the compressor 101 starts, the ambient temperature detection module 123 executes the ambient temperature detection step S3, detecting and acquiring the outdoor ambient temperature. After obtaining the outdoor ambient temperature, the indoor expansion valve standby opening adjustment module 124 executes the indoor expansion valve standby opening adjustment step S4, adjusting the opening of the indoor expansion valve 106 according to the outdoor ambient temperature obtained in the ambient temperature detection step S3.

[0097] Specifically, in this embodiment, the indoor expansion valve opening pre-adjustment module 121 controls the execution of the indoor expansion valve opening pre-adjustment step S1 in any of the above embodiments; similarly, the single-on underfloor heating mode command receiving module 122 controls the execution of the single-on underfloor heating mode command receiving step S2; the ambient temperature detection module 123 controls the execution of the ambient temperature detection step S3; and the indoor expansion valve standby opening adjustment module 124 controls the execution of the indoor expansion valve standby opening adjustment step S4.

[0098] Although the embodiments of this application are described using the indoor expansion valve opening pre-adjustment module 121, the single-open underfloor heating mode command receiving module 122, the ambient temperature detection module 123, and the indoor expansion valve standby opening adjustment module 124 as examples, 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.

[0099] In this application embodiment, a fluorinated water treatment unit 1 equipped with the above-mentioned control device 12 is also provided, including as follows: Figure 1 The compressor 101 connected by refrigerant pipes, including a water-side heat exchanger 102 and a floor heating circulation loop 104 including a floor heating side expansion valve 103 corresponding to the water-side heat exchanger 102, an indoor circulation loop 107 including at least one indoor side heat exchanger 105 and an indoor side expansion valve 106 corresponding to the indoor side heat exchanger 105, and an outdoor side heat exchanger 108 are shown.

[0100] The control device 12 is communicatively connected to the compressor 101, the underfloor heating side expansion valve 103, and the indoor side expansion valve 106, and controls the compressor 101, the underfloor heating side expansion valve 103, and the indoor side expansion valve 106 to execute corresponding instructions and steps.

[0101] 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 method for controlling refrigerant distribution in a pre-cooled water chiller unit, the pre-cooled water chiller unit comprising: A compressor connected via refrigerant pipes, a floor heating circulation loop including a water-side heat exchanger and a corresponding floor heating expansion valve, an indoor circulation loop including at least one indoor heat exchanger and a corresponding indoor expansion valve, and an outdoor heat exchanger, characterized in that the control method includes: The indoor expansion valve opening pre-adjustment step involves adjusting the indoor expansion valve to a preset indoor opening before the compressor starts. The single-operation underfloor heating mode command receiving step involves the compressor receiving a single-operation underfloor heating command from an external source. Ambient temperature detection steps: Detect and acquire the outdoor ambient temperature; The standby opening adjustment step of the indoor expansion valve involves adjusting the opening of the indoor expansion valve based on the outdoor ambient temperature obtained from the ambient temperature detection step.

2. The control method for refrigerant distribution in a water-cooled chiller unit as described in claim 1, characterized in that, In the standby opening adjustment step of the indoor expansion valve, when the outdoor temperature is greater than the preset temperature, the indoor expansion valve is adjusted to the first opening; when the outdoor temperature is less than or equal to the preset temperature, the indoor expansion valve is adjusted to the second opening.

3. The control method for refrigerant distribution in a water-cooled chiller unit as described in claim 2, characterized in that, The step of maintaining the opening of the indoor expansion valve is to maintain the opening of the indoor expansion valve at either the first opening or the second opening until the specified conditions are met.

4. The control method for refrigerant distribution in a ground-to-ground water chiller unit as described in claim 3, characterized in that, The specified condition is that the exhaust temperature of the compressor reaches a predetermined exhaust temperature.

5. The control method for refrigerant distribution in a ground-to-ground water chiller unit as described in claim 3, characterized in that, The specified condition is that the opening degree of the indoor expansion valve is maintained at the first opening degree or the second opening degree for a specified duration.

6. The control method for refrigerant distribution in a ground-to-ground water chiller unit as described in claim 3, characterized in that, It also includes subsequent control steps, In the subsequent control steps, the opening degree of the indoor expansion valve is adjusted according to the outdoor ambient temperature obtained from the ambient temperature detection step.

7. The control method for refrigerant distribution in a ground-to-ground water chiller unit as described in claim 6, characterized in that, The matching relationship between the outdoor ambient temperature and the indoor expansion valve opening in the subsequent control steps is different from the matching relationship between the outdoor ambient temperature and the indoor expansion valve opening in the indoor expansion valve standby opening adjustment step.

8. The control method for refrigerant distribution in a water-cooled chiller unit as described in claim 1, characterized in that, It also includes, The compressor low-pressure detection step involves detecting and acquiring the low-pressure side pressure of the compressor. The low-pressure value comparison step compares the low-pressure side pressure with a preset target low-pressure side pressure and outputs the low-pressure value comparison result. The first adjustment step of the indoor expansion valve is to adjust the opening degree of the indoor expansion valve according to the low pressure value comparison result.

9. The control method for refrigerant distribution in a water-cooled chiller unit as described in claim 8, characterized in that, It also includes, The exhaust superheat determination step determines whether the exhaust superheat of the compressor reaches the specified exhaust superheat. When the exhaust superheat reaches the specified exhaust superheat and the low pressure value comparison result reaches the specified threshold, the first adjustment step of the indoor expansion valve is exited.

10. The control method for refrigerant distribution in a ground-to-ground water chiller unit as described in claim 9, characterized in that, It also includes, The specified threshold is greater than or equal to 0.

11. The control method for refrigerant distribution in a water-cooled refrigeration unit as described in claim 8, characterized in that, The above-mentioned fluoride-water system also includes The indoor unit side temperature sensor is installed on the refrigerant inlet side of the indoor heat exchanger to detect the refrigerant temperature entering the indoor heat exchanger in single-operation underfloor heating mode. An indoor unit-side pressure sensor is installed on the refrigerant inlet side of the indoor heat exchanger to detect the refrigerant pressure entering the indoor heat exchanger in single-operation underfloor heating mode.

12. The control method for refrigerant distribution in a water-cooled chiller unit as described in claim 11, characterized in that, It also includes, The second adjustment step of the indoor expansion valve involves adjusting the opening degree of the indoor expansion valve based on the detection results of the indoor unit side temperature sensor or the indoor unit side pressure sensor.

13. The refrigerant distribution control method for a water-cooled refrigerant chiller unit as described in claim 8, wherein the water-cooled refrigerant chiller unit further comprises a compressor discharge pressure sensor disposed on the refrigerant outlet side of the compressor for detecting the discharge pressure of the compressor, characterized in that, The control method also includes, The compressor discharge pressure adjustment step involves adjusting the compressor discharge pressure according to the properties of the refrigerant pipeline from the compressor outlet to the indoor heat exchanger inlet.

14. The control method for refrigerant distribution in a water-cooled chiller unit as described in claim 13, characterized in that, The refrigerant piping properties include at least the pipe length, number of bends, and pressure loss characteristic value from the compressor outlet to the indoor heat exchanger inlet.

15. A control device for a natural fluoride-based water purifier unit, the natural fluoride-based water purifier unit comprising: The control device is characterized by comprising: a compressor connected via refrigerant piping; a floor heating circulation loop including a water-side heat exchanger and a corresponding floor heating expansion valve for the water-side heat exchanger; an indoor circulation loop including at least one indoor heat exchanger and a corresponding indoor expansion valve for the indoor heat exchanger; and an outdoor heat exchanger. The indoor expansion valve opening pre-adjustment module adjusts the indoor expansion valve to a preset indoor opening before the compressor starts. A single-operation underfloor heating mode command receiving module, wherein the compressor receives a single-operation command for underfloor heating from an external source; The ambient temperature detection module detects and acquires the outdoor ambient temperature. The indoor expansion valve standby opening adjustment module adjusts the opening of the indoor expansion valve based on the outdoor ambient temperature obtained by the ambient temperature detection module.

16. A refrigerant-cooled water-cooled chiller unit, comprising a compressor connected via refrigerant piping, a floor heating circulation loop including a water-side heat exchanger and a floor heating expansion valve corresponding to the water-side heat exchanger, an indoor circulation loop including at least one indoor-side heat exchanger and an indoor-side expansion valve corresponding to the indoor-side heat exchanger, and an outdoor-side heat exchanger. Its features are, It also includes the control device as described in claim 15.

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