Air conditioning system for recovering heat energy in fluorine cooling mode

Abstract

The invention relates to the technical field of heat recovery, in particular to an air conditioning system for recovering heat energy in a fluorine cooling mode, which comprises a first system, a second system and a recovery system, each of the first system and the second system comprises a compressor, a compression one-way valve, a fluorine pump, a fluorine cooling one-way valve, a condenser, a three-way valve and an evaporator; an air feeder is arranged at the evaporator; the recovery system comprises a heat exchanger and a proportional two-way valve; the heat exchanger comprises a water supply channel and two heat exchange channels; the first system and the second system each comprise a fluorine cooling mode, a compression mode and a recovery mode. By arranging the first system and the second system, the whole air conditioning system has multiple refrigeration modes; the other two systems are each provided with a recovery mode, the condenser is bypassed through the three-way valve, the refrigerant enters the heat exchange channel of the heat exchanger after absorbing heat through the evaporator, and therefore heat can be conducted into the water supply channel of the heat exchanger, and heat generated by the air conditioning system can be recovered.

Description

Technical Field

[0001] The invention relates to the technical field of heat recovery, and in particular to an air conditioning system that recovers heat energy in a fluorine cooling mode. Background Art

[0002] Energy efficiency optimization of air conditioning systems is an important topic in data centers and other high-energy consumption facilities. Existing air conditioning systems have some deficiencies in heat recovery and waste heat treatment, which affect the overall energy efficiency and operational stability of the system.

[0003] For air-to-air heat exchangers, they cannot completely recover all heat during heat exchange, resulting in partial energy loss. In addition, in low temperature environments, air-to-air heat exchangers are prone to ice formation, resulting in reduced heat exchange efficiency and even blocking the heat exchange channel, affecting the normal operation of the system.

[0004] For air-cooled heat exchangers, the air-cooled heat exchangers fail to effectively utilize waste heat, resulting in energy waste. The impact of waste heat emissions on the surrounding environment cannot be ignored. It may cause local temperature increases and affect the operation of other equipment.

[0005] In order to overcome the shortcomings of existing technologies and improve the energy efficiency of air-conditioning systems throughout the year, a preheating and recovery air-conditioning system is needed. It makes full use of natural cold sources and intelligently selects the machine operation mode according to different ambient temperatures, thereby achieving the best operation plan and reducing the energy consumption of the entire system. Summary of the invention

[0006] The purpose of the present invention is to provide an air conditioning system for heat recovery in fluorine cooling mode in view of the above-mentioned deficiencies in the prior art.

[0007] The object of the present invention is achieved through the following technical solutions: an air conditioning system for heat recovery in fluorine cooling mode, comprising a first system, a second system and a recovery system; the first system and the second system both comprise a compressor, a compression check valve, a fluorine pump, a fluorine cooling check valve, a condenser, a three-way valve and an evaporator; a blower is provided at the evaporator; an exhaust fan is provided at the condenser;

[0008] The recovery system includes a heat exchanger and a proportional two-way valve; the heat exchanger includes a water supply channel and two heat exchange channels; the proportional two-way valve is connected to the water supply channel; a pressure difference switch is provided between the water inlet and the water outlet of the water supply channel; the two heat exchange channels are respectively connected to the first system and the second system;

[0009] The first system and the second system both include a fluorine cooling mode, a compression mode and a recovery mode.

[0010] The present invention is further configured such that, in compression mode, the flow paths of the refrigeration systems of the first system and the second system are: compressor-three-way valve-condenser-fluorine cooling check valve-evaporator-compressor;

[0011] In the fluorine cooling mode, the flow paths of the refrigeration system of the first system and the second system are: fluorine pump-evaporator-compression check valve-three-way valve-condenser-fluorine pump;

[0012] In the recovery mode, the flow paths of the refrigeration systems of the first system and the second system are: fluorine pump-evaporator-compression check valve-three-way valve-heat exchange channel-fluorine pump.

[0013] The present invention is further configured as follows: the compressor is arranged in parallel with the compression check valve; the fluorine pump is arranged in parallel with the fluorine cooling check valve; one end of the compressor is connected to the inlet end of the three-way valve; one outlet end of the three-way valve is connected to one end of the condenser; the other end of the condenser is connected to one end of the fluorine pump; the other outlet end of the three-way valve is connected to the other end of the condenser after passing through a heat exchange channel; the other end of the fluorine pump is connected to one end of the evaporator; and the other end of the evaporator is connected to the other end of the compressor.

[0014] The present invention is further configured such that a liquid storage tank is provided between the other end of the condenser and one end of the fluorine pump; an electronic expansion valve is provided between the other end of the fluorine pump and one end of the evaporator; a gas-liquid separator is provided between the other end of the evaporator and the other end of the compressor; a branch connecting the compressor and the gas-liquid separator is provided in parallel at both ends of the compression check valve;

[0015] The evaporator of the first system and the evaporator of the second system are arranged overlappingly; the evaporator of the second system is arranged between the evaporator of the first system and the blower.

[0016] The present invention is further configured to include the following steps:

[0017] Step S1, detect whether the proportional two-way valve is opened to the first opening, if yes, proceed to step S2; if no, the first system and the second system maintain the current mode;

[0018] Step S2, detect whether the pressure difference switch is turned on, if so, proceed to step S3; if not, the first system and the second system maintain the current mode;

[0019] Step S3, detecting whether the return water temperature of the water inlet of the water supply channel is less than the first return water temperature value, if so, proceed to step A; if not, proceed to step S4;

[0020] Step A: both the first system and the second system enter the recovery mode; then enter step B1;

[0021] Step S4, detecting whether the return water temperature of the water inlet of the water supply channel is less than the second return water temperature value, and the second return water temperature value is greater than the first return water temperature value, if so, proceed to step C; if not, the first system and the second system maintain the current mode;

[0022] Step C: The first system maintains the current mode, and the second system enters the recovery mode; then proceeds to step D.

[0023] The present invention is further configured to include the following steps:

[0024] Step D, detecting the water supply temperature of the water outlet of the water supply channel, the air supply temperature of the blower, and the opening of the proportional two-way valve; if the water supply temperature of the water outlet of the water supply channel is less than the water supply temperature setting value within the first time, the air supply temperature of the blower is less than the first air supply temperature value within the second time, and the opening of the proportional two-way valve is less than the second opening, then proceed to step A; the second opening is less than the first opening;

[0025] The step D further includes: if the proportional two-way valve is opened to a third opening and the air supply temperature of the blower is greater than the second air supply temperature value within a third time, then entering step D1; the third opening is less than the first opening and greater than the second opening;

[0026] Step D1, detect whether the outdoor temperature is less than the outdoor temperature setting value, if so, proceed to step D11; if not, proceed to step D12;

[0027] Step D11, the first system maintains the current mode, the second system enters the fluorine cooling mode, and then enters step S1;

[0028] Step D12: The first system maintains the current mode, the second system enters the compression mode, and then enters step S1.

[0029] The present invention is further configured to include the following steps:

[0030] Step B1, detect whether the proportional two-way valve is opened to the third opening, if yes, proceed to step B2; if no, the first system and the second system maintain the recovery mode;

[0031] Step B2, detecting whether the air supply temperature of the blower is greater than the second air supply temperature value within the third time, if so, proceeding to step B3; if not, the first system and the second system maintain the recovery mode;

[0032] Step B3, check whether the outdoor temperature is less than the outdoor temperature setting value, if so, proceed to step B31; if not, proceed to step B32;

[0033] Step B31, the first system maintains the recovery mode, the second system enters the fluorine cooling mode, and then enters step B4;

[0034] Step B32: the first system maintains the recovery mode, the second system enters the compression mode, and then enters step B4;

[0035] Step B4, detecting whether the air supply temperature of the blower is greater than the third air supply temperature value within the fourth time, and the third air supply temperature value is less than the second air supply temperature value; if so, proceed to step B5; if not, proceed to step D;

[0036] Step B5: The first system enters the compression mode or the fluorine cooling mode, and then enters step S1.

[0037] The present invention is further configured to convert from the fluorine cooling mode to the recovery mode, comprising the following steps:

[0038] E1. At T1, the proportional two-way valve is gradually opened, at T2, the proportional two-way valve is opened to the first opening, the proportional two-way valve is kept at the first opening until T3, and automatically adjusted at T4;

[0039] E2, at T2, one outlet end of the three-way valve is gradually closed while the other outlet end of the three-way valve is gradually opened, and at T3, one outlet end of the three-way valve remains completely closed while the other outlet end of the three-way valve remains completely opened;

[0040] E3. Gradually turn off the exhaust fan at T3 and keep it completely closed at T4.

[0041] The present invention is further configured to convert from the compression mode to the recovery mode, comprising the following steps:

[0042] F1, gradually open the proportional two-way valve at T5, open the proportional two-way valve to the first opening at T6, keep the proportional two-way valve at the first opening until T8, and perform automatic adjustment at T9;

[0043] F2. At T6, one outlet end of the three-way valve is gradually closed while the other outlet end of the three-way valve is gradually opened. At T7, one outlet end of the three-way valve remains completely closed while the other outlet end of the three-way valve remains completely opened.

[0044] F3, gradually turn off the exhaust fan at T7, and keep the exhaust fan completely turned off between T7 and T8;

[0045] F4, gradually open the fluorine pump at T7, and automatically adjust it after the fluorine pump is fully opened at T8;

[0046] F5. The compressor is gradually turned off at T8, and the compressor remains completely turned off between T8 and T9.

[0047] The present invention is further configured to include the following steps when exiting from the recycling mode:

[0048] G1, at T10, the exhaust fan is turned on to the first speed and maintained until T11, and at T11, the exhaust fan is turned on to the second speed and maintained at the second speed;

[0049] G2. At T11, one outlet end of the three-way valve gradually opens while the other outlet end of the three-way valve gradually closes. At T12, the three-way valve is in the first state and maintains the first state until T13. At T13, one outlet end of the three-way valve continues to gradually open while the other outlet end of the three-way valve continues to gradually close. At T14, one outlet end of the three-way valve remains fully opened while the other outlet end of the three-way valve remains fully closed.

[0050] Beneficial effects of the present invention: The present invention provides a first system and a second system so that the entire air-conditioning system has a variety of refrigeration modes; the other two systems are both provided with a recovery mode, and the condenser is bypassed through a three-way valve, so that the refrigerant enters the heat exchange channel of the heat exchanger after absorbing heat in the evaporator, thereby being able to conduct heat to the water supply channel of the heat exchanger, thereby being able to recover the heat generated by the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0052] Figure 1 It is a module block diagram of the present invention;

[0053] Figure 2 is a system flow chart of the present invention;

[0054] Figure 3 It is a timing diagram of the conversion of the fluorine cooling mode into the recovery mode of the present invention;

[0055] Figure 4 is a timing diagram of the conversion of the compression mode to the recovery mode of the present invention;

[0056] Figure 5 is a timing diagram of the present invention exiting the recycling mode;

[0057] Among them: 1. Compressor; 11. Compression check valve; 2. Fluorine pump; 21. Fluorine cooling check valve; 3. Condenser; 31. Exhaust fan; 4. Three-way valve; 5. Evaporator; 51. Blower; 6. Heat exchanger; 61. Water supply channel; 62. Heat exchange channel; 63. Proportional two-way valve; 64. Pressure difference switch; 7. Liquid storage tank; 8. Electronic expansion valve; 9. Gas-liquid separator. DETAILED DESCRIPTION

[0058] The present invention is further described in conjunction with the following examples.

[0059] Depend on Figures 1 to 5 It can be seen that the air conditioning system for heat recovery in the fluorine cooling mode described in this embodiment includes a first system, a second system and a recovery system; the first system and the second system both include a compressor 1, a compression check valve 11, a fluorine pump 2, a fluorine cooling check valve 21, a condenser 3, a three-way valve 4 and an evaporator 5; the evaporator 5 is provided with a blower 51; the condenser 3 is provided with an exhaust fan 31;

[0060] The recovery system includes a heat exchanger 6 and a proportional two-way valve 63; the heat exchanger 6 includes a water supply channel 61 and two heat exchange channels 62; the proportional two-way valve 63 is connected to the water supply channel 61; a pressure difference switch 64 is provided between the water inlet and the water outlet of the water supply channel 61; the two heat exchange channels 62 are respectively connected to the first system and the second system;

[0061] The first system and the second system both include a fluorine cooling mode, a compression mode and a recovery mode.

[0062] Specifically, the air-conditioning system for heat recovery in the fluorine cooling mode described in this embodiment can start the compression mode of the two systems at the same time, and start the fluorine cooling mode of the two systems at the same time by setting the first system and the second system, or one system can start the compression mode and the other system can start the fluorine cooling mode, so that the entire air-conditioning system has multiple cooling modes.

[0063] The other two systems are both provided with a recovery mode. In the recovery mode, the condenser 3 is bypassed through the three-way valve 4, so that the refrigerant enters the heat exchange channel 62 of the heat exchanger 6 after absorbing heat in the evaporator 5, thereby conducting the heat to the water supply channel 61 of the heat exchanger 6 to heat the water in the water supply channel 61, thereby recovering the heat generated by the air-conditioning system.

[0064] In the present embodiment, an air conditioning system for heat recovery in fluorine cooling mode is described. In compression mode, the flow paths of the refrigeration system of the first system and the second system are: compressor 1-three-way valve 4-condenser 3-fluorine cooling check valve 21-evaporator 5-compressor 1;

[0065] In the fluorine cooling mode, the flow paths of the refrigeration system of the first system and the second system are: fluorine pump 2-evaporator 5-compression check valve 11-three-way valve 4-condenser 3-fluorine pump 2;

[0066] In the recovery mode, the flow paths of the refrigeration systems of the first system and the second system are: fluorine pump 2 - evaporator 5 - compression check valve 11 - three-way valve 4 - heat exchange channel 62 - fluorine pump 2 .

[0067] Specifically, the air-conditioning system that recovers heat energy in the fluorine cooling mode described in this embodiment only needs to start the fluorine pump 2 in the recovery mode, and there is no need to start the compressor 1. The above-mentioned setting can provide sufficient heat to heat the water in the water supply channel 61, which is suitable for scenarios with low requirements on the water temperature in the water supply channel 61. It can reduce the energy efficiency of the entire air-conditioning system and reduce the waste of resources.

[0068] In the embodiment described, an air-conditioning system for heat recovery in fluorine cooling mode is provided, wherein the compressor 1 is arranged in parallel with the compression check valve 11; the fluorine pump 2 is arranged in parallel with the fluorine cooling check valve 21; one end of the compressor 1 is connected to the inlet end of the three-way valve 4; one outlet end of the three-way valve 4 is connected to one end of the condenser 3; the other end of the condenser 3 is connected to one end of the fluorine pump 2; the other outlet end of the three-way valve 4 is connected to the other end of the condenser 3 after passing through the heat exchange channel 62; the other end of the fluorine pump 2 is connected to one end of the evaporator 5; the other end of the evaporator 5 is connected to the other end of the compressor 1.

[0069] In the air conditioning system for heat recovery in fluorine cooling mode described in this embodiment, a liquid storage tank 7 is provided between the other end of the condenser 3 and one end of the fluorine pump 2; an electronic expansion valve 8 is provided between the other end of the fluorine pump 2 and one end of the evaporator 5; a gas-liquid separator 9 is provided between the other end of the evaporator 5 and the other end of the compressor 1; the branch connecting the compressor 1 and the gas-liquid separator 9 is provided in parallel at both ends of the compression check valve 11; the above arrangement makes the entire air conditioning system more stable and reliable;

[0070] The evaporator 5 of the first system is arranged overlapping with the evaporator 5 of the second system; the above arrangement makes the whole air conditioning system more stable and reliable, and can reduce the number of exhaust fans 31 and air blowers 51, which can effectively save costs. The evaporator 5 of the second system is arranged between the evaporator 5 and the air blower 51 of the first system; specifically, after the evaporator 5 of the second system overlaps with the evaporator 5 of the first system, the evaporator 5 of the second system is located on the leeward side relative to the evaporator 5 of the first system, and the airflow first passes through the evaporator 5 of the first system and then passes through the evaporator 5 of the second system. Therefore, when the air blower 51 is shared, the heat exchange efficiency of the second system at the evaporator 5 is lower than that of the first system, so it is preferred to let the second system enter the recovery mode first.

[0071] An air conditioning system for heat recovery in fluorine cooling mode described in this embodiment includes the following steps:

[0072] Step S1, detect whether the proportional two-way valve 63 is opened to the first opening degree, if yes, proceed to step S2; if no, the first system and the second system maintain the current mode; wherein the first opening degree can be 100%;

[0073] Step S2, detect whether the pressure difference switch 64 is turned on, if so, proceed to step S3; if not, the first system and the second system maintain the current mode;

[0074] Step S3, detect whether the return water temperature of the water inlet of the water supply channel 61 is less than the first return water temperature value, if so, proceed to step A; if not, proceed to step S4; wherein the first return water temperature value may be 10 degrees;

[0075] Step A: both the first system and the second system enter the recovery mode; then enter step B1;

[0076] Step S4, detect whether the return water temperature of the water inlet of the water supply channel 61 is less than the second return water temperature value, and the second return water temperature value is greater than the first return water temperature value. If so, proceed to step C; if not, the first system and the second system maintain the current mode; wherein the second return water temperature value can be 13 degrees;

[0077] Step C: The first system maintains the current mode, and the second system enters the recovery mode; then proceeds to step D.

[0078] Specifically, the air-conditioning system for heat recovery in the fluorine cooling mode described in the present embodiment fully opens the proportional two-way valve 63 first, determines through the pressure difference switch 64 that the water flow in the water supply channel 61 is sufficient, and then determines whether the heat supply is sufficient, thereby determining the number of systems in the dual system to enter the recovery mode; when the water flow temperature of the water supply channel 61 is lower than 10 degrees, two systems are required to supply heat to the water supply channel 61, and when the water flow temperature of the water supply channel 61 is greater than 10 degrees and less than 13 degrees, only one system is required to supply heat to the water supply channel 61; the above-mentioned setting can ensure that the return water temperature meets the standard, thereby ensuring sufficient heat supply.

[0079] The air conditioning system for heat recovery in the fluorine cooling mode described in this embodiment further includes the following steps:

[0080] Step D, detecting the water supply temperature of the water outlet of the water supply channel 61, the air supply temperature of the blower 51 and the opening of the proportional two-way valve 63; if the water supply temperature of the water outlet of the water supply channel 61 is less than the water supply temperature setting value within the first time, the air supply temperature of the blower 51 is less than the first air supply temperature value within the second time, and the opening of the proportional two-way valve 63 is less than the second opening, then proceed to step A; the second opening is less than the first opening;

[0081] Specifically, assuming that the water supply temperature at the outlet of the water supply channel 61 is lower than the water supply temperature setting value within 45 seconds, the air supply temperature of the blower 51 is lower than the first air supply temperature value within 45 seconds, and the opening of the proportional two-way valve 63 is lower than 65%, it means that the entire system has insufficient heating for a long time and sufficient cooling. At this time, both systems enter the recovery mode to increase the heating to the water supply channel 61.

[0082] The step D further includes: if the proportional two-way valve 63 is opened to a third opening and the air supply temperature of the blower 51 is greater than the second air supply temperature value within a third time, then entering step D1; the third opening is less than the first opening and greater than the second opening; wherein the third opening can be 85%, the third time can be 5 seconds, and the second air supply temperature value can be 23 degrees;

[0083] Step D1, detect whether the outdoor temperature is less than the outdoor temperature setting value, if so, proceed to step D11; if not, proceed to step D12; the outdoor temperature can be determined by collecting the temperature at the exhaust fan 31, and the outdoor temperature setting value can be 8 degrees;

[0084] Step D11, the first system maintains the current mode, the second system enters the fluorine cooling mode, and then enters step S1;

[0085] Step D12: The first system maintains the current mode, the second system enters the compression mode, and then enters step S1.

[0086] Specifically, since the air supply temperature of the blower 51 is greater than the second air supply temperature value within the third time, it means that the cooling effect is poor. Therefore, in order to ensure the overall cooling effect, it is necessary to reduce the load of the second system in the recovery mode, and determine whether the second system enters the compression mode or the fluorine cooling mode after the load reduction according to the outdoor temperature.

[0087] The air conditioning system for heat recovery in the fluorine cooling mode described in this embodiment further includes the following steps:

[0088] Step B1, detect whether the proportional two-way valve 63 is opened to the third opening degree, if yes, proceed to step B2; if no, the first system and the second system maintain the recovery mode; wherein the third opening degree can be 85%,

[0089] Step B2, detecting whether the air supply temperature of the blower 51 is greater than the second air supply temperature value within the third time, if yes, proceeding to step B3; if no, the first system and the second system maintain the recovery mode; the third time may be 5 seconds, and the second air supply temperature value may be 23 degrees;

[0090] Step B3, check whether the outdoor temperature is less than the outdoor temperature setting value, if so, proceed to step B31; if not, proceed to step B32; the outdoor temperature can be determined by collecting the temperature at the exhaust fan 31, and the outdoor temperature setting value can be 8 degrees;

[0091] Step B31, the first system maintains the recovery mode, the second system enters the fluorine cooling mode, and then enters step B4;

[0092] Step B32: the first system maintains the recovery mode, the second system enters the compression mode, and then enters step B4;

[0093] Step B4, detect whether the air supply temperature of the blower 51 is greater than the third air supply temperature value within the fourth time, and the third air supply temperature value is less than the second air supply temperature value; if so, proceed to step B5; if not, proceed to step D; the fourth time can be 30 seconds, and the second air supply temperature value can be 22 degrees;

[0094] Step B5: The first system enters the compression mode or the fluorine cooling mode, and then enters step S1.

[0095] Specifically, since the air supply temperature of the air supply fan 51 is greater than the second air supply temperature value within the third time, it means that the cooling effect is poor. Therefore, in order to ensure the overall cooling effect, it is necessary to reduce the load of the second system in the recovery mode, and determine whether the second system enters the compression mode or the fluorine cooling mode after the load reduction according to the outdoor temperature; since the cooling capacity provided by the water-cooled plate heat exchanger 6 to the evaporator 5 is less than the cooling capacity provided to the evaporator 5 after the air-cooled condenser 3 exchanges heat. Although there is a heat recovery function, the air conditioner in the computer room has a higher priority for cooling capacity. Therefore, when the cooling capacity is insufficient, it is necessary to reduce the load of water cooling and convert it to air cooling after heat recovery; conversely, when the cooling capacity is sufficient, the air-cooled condenser 3 can be switched to a water-cooled plate heat exchanger 6. Turning off the air supply fan 51 on the premise of satisfying the cooling priority can reduce energy consumption, and the heat recovered can also be used for further energy saving.

[0096] If the air supply temperature of the blower 51 is detected to be greater than the third air supply temperature value within the fourth time, it means that the overall cooling effect is still insufficient. At this time, the first system needs to exit the recovery mode at the same time.

[0097] This control method ensures that the water flow is sufficient when the load-reducing system is in recovery mode. Because the supply air temperature of the refrigeration is high, the refrigeration capacity is insufficient, so it is necessary to reduce the load and exit the recovery mode. The outdoor temperature determines whether the system enters the compressor cycle or the fluorine pump cycle after the load-reducing recovery mode. If both systems are in recovery mode, it is necessary to decide whether to exit the recovery mode of the other system based on the supply air temperature.

[0098] The air conditioning system for heat recovery in the fluorine cooling mode described in this embodiment converts from the fluorine cooling mode to the recovery mode, including the following steps:

[0099] E1, gradually opening the proportional two-way valve 63 at T1, opening the proportional two-way valve 63 to the first opening degree at T2, maintaining the proportional two-way valve 63 at the first opening degree until T3, and automatically adjusting at T4;

[0100] E2, at T2, one outlet end of the three-way valve 4 is gradually closed while the other outlet end of the three-way valve 4 is gradually opened, and at T3, one outlet end of the three-way valve 4 remains completely closed while the other outlet end of the three-way valve 4 remains completely opened;

[0101] E3. At T3, the exhaust fan 31 is gradually turned off, and at T4, the exhaust fan 31 remains completely turned off.

[0102] Specifically, through the above-mentioned settings, when the fluorine cooling mode is converted to the recovery mode, the proportional two-way valve 63 is first gradually opened. When the proportional two-way valve 63 is opened to 100% opening, the three-way valve 4 is controlled to make the refrigerant start to switch between the condenser 3 and the heat exchange channel 62. After the complete switching, the exhaust fan 31 is gradually closed.

[0103] An air conditioning system for heat recovery in fluorine cooling mode described in this embodiment is converted from compression mode to recovery mode, including the following steps:

[0104] F1, gradually opening the proportional two-way valve 63 at T5, opening the proportional two-way valve 63 to the first opening degree at T6, maintaining the proportional two-way valve 63 at the first opening degree until T8, and automatically adjusting at T9;

[0105] F2. At T6, one outlet end of the three-way valve 4 is gradually closed while the other outlet end of the three-way valve 4 is gradually opened. At T7, one outlet end of the three-way valve 4 remains completely closed while the other outlet end of the three-way valve 4 remains completely opened.

[0106] F3, gradually turning off the exhaust fan 31 at T7, and keeping the exhaust fan 31 completely turned off between T7 and T8;

[0107] F4, gradually open the fluorine pump 2 at T7, and automatically adjust after the fluorine pump 2 is fully opened at T8;

[0108] F5. Gradually turn off compressor 1 at T8, and keep compressor 1 completely turned off between T8 and T9.

[0109] Specifically, through the above-mentioned settings, when the compression mode is converted to the recovery mode, the proportional two-way valve 63 is first gradually opened. When the proportional two-way valve 63 is opened to 100% opening, the three-way valve 4 is controlled to make the refrigerant start to switch between the condenser 3 and the heat exchange channel 62. After the complete switching, the exhaust fan 31 is gradually closed and the fluorine pump 2 is gradually opened. When the fluorine pump 2 is fully opened, the compressor 1 is gradually closed, so as to maintain the stability of the overall system.

[0110] An air conditioning system for heat recovery in a fluorine cooling mode described in this embodiment, when exiting from the recovery mode, includes the following steps:

[0111] G1, at T10, the exhaust fan 31 is turned on to the first speed and maintained until T11, and at T11, the exhaust fan 31 is turned on to the second speed and maintained at the second speed;

[0112] G2. At T11, one outlet end of the three-way valve 4 gradually opens while the other outlet end of the three-way valve 4 gradually closes. At T12, the three-way valve 4 is in the first state and maintains the first state until T13. At T13, one outlet end of the three-way valve 4 continues to gradually open while the other outlet end of the three-way valve 4 continues to gradually close. At T14, one outlet end of the three-way valve 4 remains fully opened while the other outlet end of the three-way valve 4 remains fully closed.

[0113] Specifically, when exiting the recovery mode, the three-way valve 4 needs to maintain the first state for a certain period of time, so that the condenser 3 on the air-cooled side of the fluorine circuit can establish a stable heat exchange relationship. When unloading, the three-way valve 4 stays in the first state, i.e., at 50% opening, in order to establish a stable heat exchange relationship for the condenser 3 on the air-cooled side of the fluorine circuit. Since the pipeline of the air-cooled condenser 3 is longer, the three-way valve 4 stays open to ensure that when switching from the water-cooled plate heat exchanger 6 to the air-cooled condenser 3, sufficient refrigerant passes through the condenser 3 and enters the liquid storage tank 7 to ensure sufficient liquid level; compared to direct switching, insufficient refrigerant in the pipeline of the air-cooled condenser 3 will cause the fluorine pump 2 to lack liquid after all the refrigerant in the liquid storage tank 7 migrates to the evaporator 5.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An air conditioning system for heat recovery in fluorine cooling mode, characterized in that: The invention comprises a first system, a second system and a recovery system; the first system and the second system both comprise a compressor (1), a compression check valve (11), a fluorine pump (2), a fluorine cooling check valve (21), a condenser (3), a three-way valve (4) and an evaporator (5); the evaporator (5) is provided with a blower (51); the condenser (3) is provided with an exhaust fan (31); The recovery system comprises a heat exchanger (6) and a proportional two-way valve (63); the heat exchanger (6) comprises a water supply channel (61) and two heat exchange channels (62); the proportional two-way valve (63) is in communication with the water supply channel (61); a pressure difference switch (64) is provided between the water inlet and the water outlet of the water supply channel (61); the two heat exchange channels (62) are respectively in communication with the first system and the second system; The first system and the second system both include a fluorine cooling mode, a compression mode and a recovery mode.

2. The air conditioning system for heat recovery in fluorine cooling mode according to claim 1, characterized in that: In the compression mode, the flow paths of the refrigeration system of the first system and the second system are: compressor (1) - three-way valve (4) - condenser (3) - fluorine cooling check valve (21) - evaporator (5) - compressor (1); In the fluorine cooling mode, the flow paths of the refrigeration systems of the first system and the second system are: fluorine pump (2) - evaporator (5) - compression check valve (11) - three-way valve (4) - condenser (3) - fluorine pump (2); In the recovery mode, the flow paths of the refrigeration systems of the first system and the second system are: fluorine pump (2) - evaporator (5) - compression check valve (11) - three-way valve (4) - heat exchange channel (62) - fluorine pump (2).

3. The air conditioning system for heat recovery in fluorine cooling mode according to claim 2, characterized in that: The compressor (1) is arranged in parallel with the compression check valve (11); the fluorine pump (2) is arranged in parallel with the fluorine cooling check valve (21); one end of the compressor (1) is connected to the inlet end of the three-way valve (4); one outlet end of the three-way valve (4) is connected to one end of the condenser (3); the other end of the condenser (3) is connected to one end of the fluorine pump (2); the other outlet end of the three-way valve (4) is connected to the other end of the condenser (3) through the heat exchange channel (62); the other end of the fluorine pump (2) is connected to one end of the evaporator (5); the other end of the evaporator (5) is connected to the other end of the compressor (1).

4. The air conditioning system for heat recovery in fluorine cooling mode according to claim 3, characterized in that: A liquid storage tank (7) is provided between the other end of the condenser (3) and one end of the fluorine pump (2); an electronic expansion valve (8) is provided between the other end of the fluorine pump (2) and one end of the evaporator (5); a gas-liquid separator (9) is provided between the other end of the evaporator (5) and the other end of the compressor (1); a branch connecting the compressor (1) and the gas-liquid separator (9) is provided in parallel at both ends of the compression check valve (11); The evaporator (5) of the first system and the evaporator (5) of the second system are arranged overlappingly; the evaporator (5) of the second system is arranged between the evaporator (5) of the first system and the blower (51).

5. The air conditioning system for heat recovery in fluorine cooling mode according to claim 1, characterized in that: The following steps are involved: Step S1, detecting whether the proportional two-way valve (63) is opened to a first opening degree, if so, proceeding to step S2; if not, the first system and the second system maintain the current mode; Step S2, detecting whether the pressure difference switch (64) is turned on, if so, proceeding to step S3; if not, the first system and the second system maintain the current mode; Step S3, detecting whether the return water temperature of the water inlet of the water supply channel (61) is less than the first return water temperature value, if so, proceed to step A; if not, proceed to step S4; Step A: both the first system and the second system enter the recovery mode; then enter step B1; Step S4, detecting whether the return water temperature of the water inlet of the water supply channel (61) is less than the second return water temperature value, and the second return water temperature value is greater than the first return water temperature value. If so, proceed to step C; if not, the first system and the second system maintain the current mode; Step C: The first system maintains the current mode, and the second system enters the recovery mode; then proceeds to step D.

6. An air conditioning system for heat recovery in fluorine cooling mode according to claim 5, characterized in that: The following steps are also included: Step D, detecting the water supply temperature of the water outlet of the water supply channel (61), the air supply temperature of the blower (51), and the opening of the proportional two-way valve (63); if the water supply temperature of the water outlet of the water supply channel (61) is less than the water supply temperature setting value within the first time, the air supply temperature of the blower (51) is less than the first air supply temperature value within the second time, and the opening of the proportional two-way valve (63) is less than the second opening, then proceeding to step A; The second opening is smaller than the first opening; The step D further comprises: if the proportional two-way valve (63) is opened to a third opening and the air supply temperature of the air supply fan (51) is greater than the second air supply temperature value within a third time, then entering step D1; the third opening is less than the first opening and greater than the second opening; Step D1, detect whether the outdoor temperature is less than the outdoor temperature setting value, if so, proceed to step D11; if not, proceed to step D12; Step D11, the first system maintains the current mode, the second system enters the fluorine cooling mode, and then enters step S1; Step D12: The first system maintains the current mode, the second system enters the compression mode, and then enters step S1.

7. An air conditioning system for heat recovery in fluorine cooling mode according to claim 6, characterized in that: The following steps are also included: Step B1, detecting whether the proportional two-way valve (63) is opened to the third opening degree, if so, proceeding to step B2; if not, the first system and the second system maintain the recovery mode; Step B2, detecting whether the air supply temperature of the air supply fan (51) is greater than the second air supply temperature value within the third time, if so, proceeding to step B3; if not, the first system and the second system maintain the recovery mode; Step B3, check whether the outdoor temperature is less than the outdoor temperature setting value, if so, proceed to step B31; if not, proceed to step B32; Step B31, the first system maintains the recovery mode, the second system enters the fluorine cooling mode, and then enters step B4; Step B32: the first system maintains the recovery mode, the second system enters the compression mode, and then enters step B4; Step B4, detecting whether the air supply temperature of the air supply fan (51) is greater than a third air supply temperature value within a fourth time, and whether the third air supply temperature value is less than the second air supply temperature value; If yes, proceed to step B5; if no, proceed to step D; Step B5: The first system enters the compression mode or the fluorine cooling mode, and then enters step S1.

8. The air conditioning system for heat recovery in fluorine cooling mode according to claim 3, characterized in that: Converting from fluorine cooling mode to recovery mode includes the following steps: E1, gradually opening the proportional two-way valve (63) at T1, opening the proportional two-way valve (63) to a first opening degree at T2, maintaining the proportional two-way valve (63) at the first opening degree until T3, and automatically adjusting at T4; E2, at T2, one outlet end of the three-way valve (4) is gradually closed while the other outlet end of the three-way valve (4) is gradually opened, and at T3, one outlet end of the three-way valve (4) remains completely closed while the other outlet end of the three-way valve (4) remains completely open; E3. At T3, the exhaust fan (31) is gradually turned off, and at T4, the exhaust fan (31) remains completely turned off.

9. The air conditioning system for heat recovery in fluorine cooling mode according to claim 3, characterized in that: Switching from compression mode to recycling mode involves the following steps: F1, gradually opening the proportional two-way valve (63) at T5, opening the proportional two-way valve (63) to a first opening degree at T6, maintaining the proportional two-way valve (63) at the first opening degree until T8, and automatically adjusting at T9; F2. At T6, one outlet end of the three-way valve (4) is gradually closed while the other outlet end of the three-way valve (4) is gradually opened. At T7, one outlet end of the three-way valve (4) remains completely closed while the other outlet end of the three-way valve (4) remains completely open. F3, gradually turning off the exhaust fan (31) at T7, and keeping the exhaust fan (31) completely turned off between T7 and T8; F4, gradually turning on the fluorine pump (2) at T7, and automatically adjusting after the fluorine pump (2) remains fully turned on at T8; F5. The compressor (1) is gradually turned off at T8, and the compressor (1) remains completely turned off between T8 and T9.

10. The air conditioning system for heat recovery in fluorine cooling mode according to claim 3, characterized in that: When exiting from recycling mode, the following steps are involved: G1, at T10, the exhaust fan (31) is turned on to a first speed and maintained until T11, and at T11, the exhaust fan (31) is turned on to a second speed and maintained at the second speed; G2. At T11, one outlet end of the three-way valve (4) gradually opens while the other outlet end of the three-way valve (4) gradually closes; at T12, the three-way valve (4) is in the first state and remains in the first state until T13; at T13, one outlet end of the three-way valve (4) continues to gradually open while the other outlet end of the three-way valve (4) continues to gradually close; at T14, one outlet end of the three-way valve (4) remains completely open while the other outlet end of the three-way valve (4) remains completely closed.

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