WO2016141790A1

WO2016141790A1 - Multi-connection refrigeration system having natural cold source, and control method thereof

Info

Publication number: WO2016141790A1
Application number: PCT/CN2016/073228
Authority: WO
Inventors: 黄志超; 黄桂良; 胡荣国
Original assignee: 深圳市艾特网能有限公司
Priority date: 2015-03-10
Filing date: 2016-02-02
Publication date: 2016-09-15
Also published as: CN104776524A; CN104776524B

Abstract

A multi-connection refrigeration system having a natural cold source, and control method thereof. The system comprises at least one indoor refrigerating unit (10), at least one outdoor refrigerating unit (20), and a cold energy transfer unit (30) connecting the indoor refrigerating unit (10) to the outdoor refrigerating unit (20). The cold energy transfer unit (30) comprises a liquid storage device (31) for storing refrigerant, and a transporting pump (32) connected to the liquid storage device (31). The outdoor refrigerating unit (20) comprises a recuperative heat exchanging unit (21) comprising a first heat exchanging pipe (211) and a second heat exchanging pipe (212) independent of each other and used to exchange heat. The outdoor refrigerating unit (20) further comprises a compressor (22), a condensing device (23), a refrigerant pump (26) and a second control portion (25). The indoor refrigerating unit (10) comprises a first flow control valve (11), an indoor evaporator (12) and a first control portion (13). The indoor refrigerating unit (10), the cold energy transfer unit (30) and the first heat exchanging pipe (211) form a closed cycle.

Description

Description: Inventive name: Multi-connected refrigeration system with natural cooling and its control method

[0001] The present invention relates to the field of refrigeration systems, and more particularly to a multiple refrigeration system with natural cooling and a method of controlling the same.

Background technique

[0002] The current multi-cooling system with natural cooling, especially in multi-unit refrigeration units such as computer rooms, data centers, etc., such as air-cooled chillers and water-cooled chillers, all use compressors as refrigeration power refrigeration. In the case of low outdoor temperature, the compressor refrigeration system has low energy efficiency, which is easy to cause energy waste and cannot meet the national energy conservation and emission reduction requirements. Moreover, the current indoor unit has a large volume and a low energy efficiency ratio, which cannot satisfactorily meet the needs of users.

technical problem

The technical problem to be solved by the present invention is to provide an improved multi-cold refrigeration system with natural cooling and a control method thereof against the defects of the prior art.

Problem solution

Technical solution

[0004] The technical solution adopted by the present invention to solve the technical problem thereof is: a multiple cooling system with natural cooling, comprising at least one indoor refrigeration unit, at least one outdoor refrigeration unit, and a connection between the indoor refrigeration unit and a cold conveying unit of the outdoor refrigeration unit;

[0005] The cold conveying unit includes a liquid storage device for storing the refrigerant and a transfer pump connected to the liquid storage device;

[0006] The outdoor refrigeration unit includes a partition wall heat exchange unit, and the partition wall heat exchange unit includes mutually independent first heat exchange tubes and second heat exchange tubes for performing heat exchange; The cold conveying unit and the first heat exchange conduit form a closed loop;

[0007] The indoor refrigeration unit includes a first flow control valve connected to the delivery pump outlet, an indoor evaporator connected to the first flow control valve outlet and the first heat exchange conduit inlet, and a first a control unit, wherein the first control unit is connected to the first flow control valve and the transfer pump, respectively, for The internal refrigeration demand controls the start and stop of the first flow control valve and the transfer pump, and controls the temperature of the first flow control valve according to the indoor outlet superheat of the indoor evaporator, according to the front and rear of the transfer pump The differential pressure controls the capacity output of the transfer pump;

[0008] The outdoor refrigeration unit further includes a compressor connected to the second heat exchange pipe outlet, a condensing device connected to the compressor outlet, a refrigerant pump connected to the condensing device outlet, and the refrigeration a second flow control valve connected to the inlet of the second heat exchange conduit and a second control portion, the second control portion and the compressor, the second flow control valve, and the condensing device Connected to the refrigerant pump for controlling start-stop or capacity output of the compressor according to outdoor refrigeration demand, and controlling the condensing device according to a first outlet pressure and/or a first outlet temperature of the outlet of the condensing device a capacity output, controlling a temperature of the second flow control valve according to an outdoor outlet superheat of the second heat exchange conduit, and controlling a capacity output of the refrigerant pump according to a twist of the second flow control valve.

[0009] Preferably, the at least one indoor refrigeration unit comprises at least two indoor refrigeration units arranged in parallel.

[0010] Preferably, the method further comprises an indoor fan cooperating with the indoor evaporator, wherein the first control unit is connected to the indoor fan, and is configured to control the intensity or capacity output of the indoor fan according to the indoor cooling demand.

[0011] Preferably, the outdoor refrigeration unit comprises at least two outdoor refrigeration units arranged in series, and the first heat exchange pipes of the at least two outdoor refrigeration units are connected; or

[0012] the outdoor refrigeration unit includes at least two outdoor refrigeration units arranged in parallel, the at least two outdoor refrigeration units sharing one of the partition wall heat exchange units and one of the second flow control valves, the at least two At least two compressors of the outdoor refrigeration unit are connected in parallel to the second heat exchange conduit outlet of the partition wall heat exchange unit, and at least two condensation devices are connected in parallel to the at least two compressor outlets and the second flow Control valve inlet; or

[0013] The outdoor refrigeration unit includes at least two outdoor refrigeration units arranged in parallel, and the first heat exchange conduit outlets of the at least two outdoor refrigeration units are respectively connected to the liquid storage device.

[0014] Preferably, the condensing device includes an outdoor fan connected to the outdoor condenser connected between the compressor and the second flow control valve, and the outdoor fan, the second control unit and the The outdoor fan is connected to control the capacity output of the outdoor fan according to the first outlet pressure and/or the first outlet temperature of the outdoor condenser outlet; or

[0015] the condensing device includes an outdoor condenser connected between the compressor and the second flow control valve And a cooling water output device that cooperates with the outdoor condenser, the second control unit controls a capacity output of the cooling water output device.

[0016] The present invention also provides a control method for a multi-connected refrigeration system with natural cooling, comprising the following steps performed by the first control unit:

[0017] S11: obtaining indoor refrigeration demand, indoor outlet superheat of the indoor evaporator, and a pressure difference value before and after the pump;

[0018] S12: controlling start and stop of the first flow control valve and the transfer pump according to indoor refrigeration demand;

[0019] S13: controlling the twist of the first flow control valve according to the indoor outlet superheat of the indoor evaporator;

[0020] S14: controlling the capacity output of the transfer pump according to a pressure difference before and after the transfer pump;

[0021] further comprising the following steps performed by the second control unit:

[0022] S21: determining an outdoor cooling demand, a first outlet pressure of the condensing device outlet and/or a first outlet temperature, an outdoor outlet superheat of the second heat exchange conduit, and a twist of the second flow control valve;

[0023] S22: controlling start/stop or capacity output of the compressor according to outdoor cooling demand;

[0024] S23: controlling a capacity output of the condensing device according to a first outlet pressure and/or a first outlet temperature of the outlet of the condensing device;

[0025] S24: controlling the twist of the second flow control valve according to the outdoor outlet superheat of the second heat exchange conduit

S25: Control a capacity output of the refrigerant pump according to the temperature of the second flow control valve.

[0027] Preferably, the step S11 includes: collecting an indoor ambient temperature, comparing the indoor ambient temperature with a first preset temperature value, calculating a temperature difference between the two to determine the indoor cooling demand; Calculating a second outlet temperature of the evaporator outlet and/or a second outlet pressure to determine the indoor outlet superheat; collecting a pump inlet pressure and a pump outlet pressure of the delivery pump, and calculating a pressure difference before and after the pump is obtained value.

[0028] Preferably, the step S12 includes: comparing the indoor cooling demand with a preset first cooling threshold, and if the indoor cooling demand is greater than or equal to the first cooling threshold, controlling the first The flow control valve and the delivery pump are activated, and if not, controlling the first flow control valve and the delivery pump to stop working;

[0029] and / or [0030] The step S13 includes: comparing the indoor outlet superheat degree with a preset first superheat degree threshold range, and if the indoor outlet superheat degree is less than the first superheat degree threshold range, reducing the Determining the temperature of the first flow control valve; if the indoor outlet superheat is greater than the first superheat threshold range, increasing the twist of the first flow control valve; if the indoor outlet superheat is at Maintaining the temperature of the first flow control valve within the first superheat threshold range;

[0031] and / or

[0032] the step S14 includes: comparing the pressure difference value with a preset pressure difference threshold range, and if the pressure difference value is smaller than the pressure difference threshold range, reducing the capacity output of the delivery pump; And the pressure difference value is greater than the pressure difference threshold range, thereby increasing the capacity output of the delivery pump; if the pressure difference value is within the pressure difference threshold range, maintaining the capacity output of the delivery pump.

[0033] Preferably, the step S21 includes: collecting a third outlet temperature, a third outlet pressure, a first inlet pressure or a first inlet temperature of the first heat exchange conduit outlet, and the third outlet temperature, the third Calculating the three outlet pressures, the first inlet pressure or the first inlet temperature and the second preset temperature value to obtain the outdoor refrigeration demand; collecting the fourth outlet temperature and/or the fourth outlet pressure of the second heat exchange conduit outlet Calculated to determine the outdoor outlet superheat.

[0034] Preferably, the step S22 includes: comparing the outdoor cooling demand with a preset second cooling threshold, and if the outdoor cooling demand is greater than the second cooling threshold, controlling the starting the compression And adjusting the capacity output of the compressor, and if not, controlling the compressor to stop working;

[0035] and / or

[0036] the step S23 includes: converting the first outlet temperature into a corresponding outlet pressure value by calculation, and performing the corresponding outlet pressure value or the first outlet pressure with a preset pressure threshold range Comparing; if the corresponding outlet pressure value or the first outlet pressure is greater than the pressure threshold range, increasing a capacity output of the condensing device; if the corresponding outlet pressure value or the first outlet pressure Less than the pressure threshold range, reducing the capacity output of the condensing device; if the corresponding outlet pressure value or the first outlet pressure is within the pressure threshold range, maintaining the capacity of the condensing device Output

[0037] and / or

[0038] the step S24 includes: comparing the outdoor outlet superheat degree with a preset second superheat degree threshold range If the outdoor outlet superheat is less than the second superheat threshold range, reducing the twist of the second flow control valve; if the outdoor outlet superheat is greater than the second superheat threshold range, Increasing a twist of the second flow control valve; if the outdoor outlet superheat is within the second superheat threshold range, maintaining a twist of the second flow control valve;

[0039] and / or

[0040] the step S25 includes: comparing the twist of the second flow control valve with a preset threshold range

And if the mobility of the second flow control valve is less than the threshold threshold range, reducing the capacity output of the refrigerant pump; if the second flow control valve is greater than the temperature threshold range, increasing The capacity output of the refrigerant pump; if the temperature of the second flow control valve is within a threshold range, maintaining the capacity output of the refrigerant pump.

Advantageous effects of the invention

Beneficial effect

Compared with the prior art, the present invention has the following advantages: The multi-cooling system with natural cooling provided by the invention uses a compressor and a refrigerant pump as the cooling power, which can effectively improve the cooling energy efficiency and avoid energy waste; Moreover, by using the partition wall heat exchange unit to exchange heat between the indoor refrigeration unit and the outdoor refrigeration unit, the heat exchange efficiency is high, the heat loss is small, the structure is compact and light, and the floor space is small; in addition, the natural cold multi-connected refrigeration system The indoor refrigeration unit includes only the indoor evaporator and the first flow control valve and the first control portion, and has a small volume.

Brief description of the drawing

DRAWINGS

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic structural view of a multiple refrigeration system with natural cooling in Embodiment 1 of the present invention.

2 is another schematic structural view of a multiple refrigeration system with natural cooling in Embodiment 1 of the present invention.

3 is another schematic structural view of a multiple refrigeration system with natural cooling in Embodiment 1 of the present invention.

4 is another schematic structural view of a multiple refrigeration system with natural cooling in Embodiment 1 of the present invention.

5 is a flow chart showing a control method of a multi-cooling system with natural cooling in Embodiment 2 of the present invention.

6 is a flow chart of step S12 of FIG. 5.

7 is a flow chart of step S13 of FIG. 5. 8 is a flow chart of step S14 of FIG. 5.

9 is a flow chart of step S22 of FIG. 5.

10 is a flow chart of step S23 of FIG. 5.

11 is a flow chart of step S24 of FIG. 5.

12 is a flow chart of step S25 of FIG. 5.

[0055] In the figure: 10, indoor refrigeration unit; 11, the first flow control valve; 12, indoor evaporator; 13, the first control unit; 14, indoor fan; 15, the first stop valve; 20; outdoor refrigeration unit; 21, wall-type heat exchange unit; 211, first heat exchange pipe; 212, second heat exchange pipe; 22, compressor; 23, condensing device; 231, outdoor condenser; Outdoor fan; 233, cooling water output device; 24, second flow control valve; 25, second control unit; 26, refrigerant pump; 30, cold conveying unit; 31, liquid storage device; 32, conveying pump.

Embodiments of the invention

[0056] In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiment 1

[0058] FIGS. 1 to 4 illustrate a multi-cooling system with natural cooling in the present embodiment, the natural cooling multi-connected refrigeration system including at least one indoor refrigeration unit 10, at least one outdoor refrigeration unit 20, and The cold conveying unit 30 that connects the indoor refrigeration unit 10 and the outdoor refrigeration unit 20 is connected. Specifically, at least one of the indoor refrigeration units 10 includes at least two indoor refrigeration units 10 arranged in parallel. It can be understood that at least two indoor refrigeration units 10 are arranged in parallel such that the indoor refrigeration units 10 do not affect each other; the number of each indoor refrigeration unit 10 is determined according to user requirements, and the number of outdoor refrigeration units 20 depends on the indoor refrigeration unit. 10 required cooling requirements are determined.

As shown in FIGS. 1 to 4, the cooling amount conveying unit 30 includes a liquid storage device 31 for storing the refrigerant and a transfer pump 32 connected to the liquid storage device 31. It is to be understood that the refrigerant may be a liquid phase change refrigerant such as Freon which absorbs heat (i.e., refrigeration capacity) into the chamber during evaporation in a low temperature state. It can be understood that the phase change refrigerant utilizes the principle of liquid evaporation heat absorption, and the heat exchange efficiency is higher than that of the air cooling or water cooling unit using the cooling water for cold volume transportation, and the required refrigerant circulation amount is low. , no need for higher power delivery pump 3 2. The experiment proves that the phase change refrigerant is used to transport the cooling capacity. For every kilogram of the unit with a cooling capacity of 214 kJ and 100 kW, the circulation of the refrigerant only needs to reach 1.687 ton / 吋, and the power of the pump 32 is only needed. l.lkW.

[0060] As shown in FIG. 1 to FIG. 3, the outdoor refrigeration unit 20 includes a partition wall heat exchange unit 21, and the partition wall heat exchange unit 21 includes mutually independent first heat exchange tubes 211 and second exchanges for performing heat exchange. Heat pipe 212. It can be understood that the partition wall heat exchange unit 21 can be a plate heat exchange unit, and the plate heat exchange unit is an important device for heat exchange between liquid-liquid and liquid-vapor, and has high heat exchange efficiency, small heat loss, compact structure and light weight. The utility model has the advantages of small occupied area, convenient installation and cleaning, wide application and long service life.

[0061] As shown in FIGS. 1 to 4, the indoor refrigeration unit 10, the cold delivery unit 30, and the first heat exchange conduit 211 form a closed cycle. Specifically, the indoor refrigeration unit 10 includes a first flow control valve 11 connected to the outlet of the transfer pump 32, an indoor evaporator 12 connected to the outlet of the first flow control valve 11 and the inlet of the first heat exchange conduit 211, and a first control unit. 13. The first control unit 13 is connected to the first flow control valve 11 and the transfer pump 32, respectively, for controlling the start and stop of the first flow control valve 11 and the transfer pump 32 according to the indoor refrigeration demand, according to the indoor outlet of the indoor evaporator 12 The heat controls the temperature of the first flow control valve 11, and controls the capacity output of the transfer pump 32 based on the differential pressure before and after the transfer pump 32.

[0062] It can be understood that the liquid phase change refrigerant stored in the liquid storage device 31 is transported to the indoor evaporator 12 by the transfer pump 32, and is converted into a vapor phase by the evaporation of the heat in the indoor evaporator 12. The refrigerant is changed to provide a cooling capacity that meets the user's demand; the vapor phase change refrigerant flows through the first heat exchange conduit 211 of the partition heat exchange unit 21, and passes through the first heat exchange conduit 211 and the second heat exchange conduit 212. Heat exchange is performed to convert the vapor phase change refrigerant into a liquid phase change refrigerant and deliver it to the liquid storage device 31.

[0063] As shown in FIG. 1 to FIG. 4, the indoor refrigeration unit 10 further includes an indoor fan 14 that cooperates with the indoor evaporator 12, and the first control unit 13 is connected to the indoor fan 14 for controlling the indoor fan 14 according to the indoor refrigeration demand. The strength or capacity output. It is understood that the indoor fan 14 cooperating with the indoor evaporator 12 is used to increase the evaporation efficiency of the indoor evaporator 12, thereby improving the heat exchange efficiency of the indoor refrigeration unit 10.

[0064] It can be understood that the indoor refrigeration unit 10 further includes a first shutoff valve 15 disposed at the inlet of the first flow control valve 11 and a second shutoff valve 16 at the outlet of the indoor evaporator 12 (as shown in FIGS. 1-4). Through the arrangement of the first shut-off valve 15 and the second shut-off valve 16, it is convenient to independently control any indoor refrigeration unit 10 to access the multi-cooling system with natural cooling, so as to better meet the user's use requirements. [0065] The outdoor refrigeration unit 20 further includes a compressor 22 connected to the outlet of the second heat exchange conduit 212, a condensing device 23 connected to the outlet of the compressor 22, a refrigerant pump 26 connected to the outlet of the condensing device 23, and a refrigerant pump. a second flow control valve 24 connected to the inlet of the second heat exchange conduit 212 and a second control portion 25, the second control portion 25 being respectively associated with the compressor 22, the second flow control valve 24, the condensing device 23, and the refrigerant pump 26 connected, for controlling the start-stop or capacity output of the compressor 22 according to the outdoor cooling demand, controlling the capacity output of the condensing device 23 according to the first outlet pressure of the outlet of the condensing device 23 and/or the first outlet temperature, according to the second heat exchange The outdoor outlet superheat of the duct 212 controls the temperature of the second flow control valve 24, and controls the capacity output of the refrigerant pump 26 in accordance with the temperature of the second flow control valve 24. It can be understood that the outdoor refrigeration unit 20 uses the compressor 22 and the refrigerant pump 26 as the cooling power, which can effectively improve the cooling energy efficiency and avoid energy waste, especially when the outdoor temperature is low, the refrigeration efficiency of the compressor 22 is low.

[0066] It can be understood that the vaporous refrigerant placed in the circulation pipe of the outdoor refrigeration unit 20 is exothermic under the condensation of the compressor 22 and the condensing device 23 and converted into a liquid refrigerant, and the liquid refrigerant is in the partition heat exchange unit 21. The second heat exchange tube 212 absorbs heat to perform liquid to vapor phase conversion, and outputs vapor refrigerant to the compressor 22 and the condensing unit 23. It can be understood that the first heat exchange conduit 211 and the second heat exchange conduit 21 of the partition wall heat exchange unit 21 respectively perform vapor-liquid conversion and liquid-vapor conversion, and the heat exchange efficiency is high and the heat loss is small.

As shown in FIGS. 1 to 4, the first control unit 13 is communicably connected to the second control unit 25, and the second control unit 25 controls the activation of the second control unit 25 based on the indoor cooling demand transmitted by the first control unit 13. Stopping, that is, the first control unit 13 actually detects the indoor cooling demand to control the start and stop of the first flow control valve 11 and the transfer pump 32. If the first flow control valve 11 and the transfer pump 32 start and stop, the second control is correspondingly controlled. The control unit 25 is activated to detect the outdoor cooling demand, the first outlet pressure of the outlet of the condensing device 23 and/or the first outlet temperature, and the outdoor outlet superheat of the second heat exchange conduit 212 to control the respective compressors 22, condensing Device 23 and second flow control valve 24

[0068] It can be understood that the condensing device 23 disposed outdoors can adopt an air-cooling unit (as shown in FIG. 1 to FIG. 3).

The condensing device 23 includes an outdoor fan 232 coupled to the outdoor condenser 231 connected between the compressor 22 and the second flow control valve 24, and the second control unit 25 is connected to the outdoor fan 232 for The first outlet pressure at the outlet of the outdoor condenser 231 and/or the first outlet temperature controls the capacity output of the outdoor fan 232.

[0069] It can be understood that the condensing device 23 placed outdoors can also adopt a water cooling unit (as shown in FIG. 4), which The condensing device 23 includes an outdoor condenser 231 connected between the compressor 22 and the second flow rate control valve 24, and a cooling water output device 233 coupled to the outdoor condenser 231, and the second control unit 25 controls the cooling water output device 233. Capacity output.

[0070] As shown in FIG. 1, the outdoor refrigeration unit 20 may include at least two outdoor refrigeration units 20 arranged in series, and the first heat exchange tubes 211 of at least two outdoor refrigeration units 20 are connected to flow through at least two second The phase change refrigerant of the heat exchange conduit 212 is subjected to multi-stage condensation to make it more condensing efficiency, thereby improving the heat exchange efficiency of the multi-cold refrigeration system with natural cooling.

[0071] As shown in FIG. 2, the outdoor refrigeration unit 20 may include at least two outdoor refrigeration units 20 arranged in parallel, and at least two outdoor refrigeration units 20 share a wall heat exchange unit 21 and a second flow control valve 24, At least two compressors 22 of at least two outdoor refrigeration units 20 are connected in parallel to the second heat exchange conduit 2 12 outlet of the heat exchange unit, and at least two condensing devices 23 are connected in parallel to at least two compressor 22 outlets and a second flow Control valve 24 inlet. At least two outdoor refrigerating units 20 are respectively arranged in parallel by the compressor 22 and the condensing device 23 as shown in FIG. 2, which can effectively accelerate the condensation efficiency of the outdoor refrigerating unit 20, thereby accelerating the evaporation efficiency in the second heat exchange conduit 212. , improving heat exchange efficiency of the second heat exchange pipe 212 and the first heat exchange pipe 211

As shown in FIG. 3, the outdoor refrigeration unit 20 includes at least two outdoor refrigeration units 20 arranged in parallel, and the outlets of the first heat exchange tubes 211 of the at least two outdoor refrigeration units 20 are connected to the respective liquid storage devices 31. It can be understood that at least two outdoor refrigeration units 20 adopt a connection manner as shown in FIG. 3, so that each outdoor refrigeration unit 20 exchanges heat with at least two outdoor refrigeration units 20 without affecting each other, and ensures each outdoor refrigeration unit. 20 heat exchange efficiency with at least two indoor refrigeration units 10.

Embodiment 2

[0074] FIG. 5 shows a control method of the multi-cooling system with natural cooling in the present embodiment, the control method including the following steps performed by the first control unit 13:

[0075] S11: The first control unit 13 actually obtains the indoor cooling demand CFrl, the indoor outlet superheat degree SHrl of the indoor evaporator 12, and the differential pressure ΔΡ before and after the transfer pump 32. Specifically, the step S11 includes: acquiring the indoor cooling demand C Frl by collecting the indoor ambient temperature T1, comparing the indoor ambient temperature T1 with the first preset temperature value Ts etl, and calculating the temperature difference between the two as the indoor cooling demand CFrl . The indoor outlet superheat SHrl of the indoor evaporator 12 is determined by collecting the second outlet temperature T2 and/or the second of the outlet of the indoor evaporator 12 The outlet pressure P1 is calculated according to the superheat degree calculation formula to determine the indoor outlet superheat degree SHrl of the indoor evaporator 12. Specifically, by collecting the second outlet temperature T2 at two points of the outlet of the indoor evaporator 12, or the second outlet pressure P1 of two points, or collecting the second outlet temperature Τ2 and the second outlet pressure PI at any point, The indoor outlet superheat degree SHrl of the indoor evaporator 12 is calculated. The determination of the pressure difference ΔP before and after the delivery pump 32 is performed by collecting the pump inlet pressure P2 and the pump outlet pressure P3 of the delivery pump 32, and calculating the pressure difference ΔΡ before and after the delivery pump 32 is obtained.

[0076] S12: The first control unit 13 controls the start and stop of the first flow control valve 11 and the transfer pump 32 according to the indoor cooling demand CFrl. As shown in FIG. 6, step S12 includes the following steps: First control unit 13 compares indoor cooling demand CFrl with preset first cooling threshold CFsetl, and if indoor cooling demand CFrl is greater than or equal to first cooling threshold CFset1, then control A flow control valve 11 and a transfer pump 32 are activated, and if not, the first flow control valve 11 and the transfer pump 32 are controlled to stop operating. That is, only if the calculated indoor cooling demand CFrl is greater than the second cooling enthalpy CFsetl吋, it is necessary to control the indoor refrigeration unit 10 to cool, and then control the first flow control valve 11 and the transfer pump 32 to start; the larger the indoor refrigeration demand CFrl, indicating that The greater the cooling output requirement, the greater the torque Xrl of the first flow control valve 11 and the capacity output of the delivery pump 32 need to be adjusted accordingly.

[0077] and / or

[1378] S13: The first control unit 13 controls the temperature Xrl of the first flow rate control valve 11 according to the indoor outlet superheat degree SHrl of the indoor evaporator 12. As shown in FIG. 7, step S13 includes the following steps: The first control unit 13 compares the indoor outlet superheat degree SHrl with a preset first superheat degree threshold range SHsetl, if the indoor outlet superheat degree SHrl is smaller than the first superheat degree threshold range SHsetl Then, the twist Xrl of the first flow control valve 11 is reduced. If the indoor outlet superheat degree SHrl is greater than the first superheat degree threshold range SHset1, the twist Xrl of the first flow control valve 11 is increased. If the indoor outlet superheat degree SHrl is within the first superheat threshold range SHset1, the twist Xrl of the first flow control valve 11 is maintained.

[0079] and / or

[0080] S14: The first control unit 13 controls the capacity output of the transfer pump 32 based on the differential pressure ΔΡ before and after the transfer pump 32. As shown in FIG. 8, step S14 includes: the first control unit 13 compares the differential pressure difference ΔΡ with a preset differential pressure threshold range Pset, and reduces the capacity of the transfer pump 32 if the differential pressure difference ΔΡ is smaller than the differential pressure threshold range Pset. Output. If the differential pressure ΔΡ is greater than the differential pressure threshold range Pset, the capacity output of the transfer pump 32 is increased; if the differential pressure ΔΡ is within the differential pressure threshold range Pset, the capacity output of the transfer pump 32 is maintained. [0081] It can be understood that the first control unit 13 does not affect the mutual control of the transfer pump 32 and the first flow control valve 11, that is, there is no order between the two, and the control is independently controlled according to the respective control conditions. Specifically, the first control unit 13 controls the transfer pump 32 and the first flow control valve 11 by using a PID control method or a P control method.

[0082] The control method of the naturally cooled multi-connected refrigeration system further includes the following steps performed by the second control unit 25: [0083] S21: determining the outdoor cooling demand CFr2, the first outlet pressure P4 of the outlet of the condensing device 23, and/or Or the first outlet temperature T3, and the outdoor outlet superheat degree SHr2 of the second heat exchange conduit 212 and the twist Xr2 of the second flow control valve 24.

[0084] The step S21 includes: the outdoor cooling demand CFr2 collects the third outlet temperature T4, the third outlet pressure Ρ5, the first inlet pressure Ρ6 or the first inlet temperature Τ5 of the outlet of the first heat exchange conduit 211, and The three outlet temperature Τ4, the third outlet pressure Ρ5, the first inlet pressure Ρ6 or the first inlet temperature Τ6 are calculated with the second preset temperature value Tset2 to obtain the outdoor cooling demand CFr2. The first outlet pressure P4 and/or the first outlet temperature T3 at the outlet of the condensing unit 23 are collected. The determination of the outdoor outlet superheat degree SHr2 of the second heat exchange conduit 212 is performed by collecting the fourth outlet temperature T6 and/or the fourth outlet pressure P7 of the outlet of the first heat exchange conduit 211, and calculating according to the superheat degree calculation formula to determine the second change The outdoor outlet superheat degree SHr2 of the heat pipe 212. Specifically, the fourth outlet temperature T6 at two points of the second heat exchange conduit 212 exit, or the fourth outlet pressure Ρ6 at two points, or the fourth outlet temperature Τ6 and the fourth outlet pressure Ρ7 at any point are collected, The outdoor outlet superheat SHr2 can be calculated.

[0085] S22: The second control unit 25 controls the start-stop or capacity output of the compressor 22 according to the outdoor cooling demand CFr2. As shown in FIG. 9, step S22 includes the following steps: comparing the outdoor cooling demand CFr2 with a preset second cooling threshold C Fset2, and if the outdoor cooling demand CFr2 is greater than the second cooling threshold CFset2, controlling the starting of the compressor 2 2 and adjusting The capacity output of the compressor 22, if not, controls the compressor 22 to stop operating.

[0086] and / or

[0087] S23: The second control unit 25 controls the capacity output of the condensing device 23 according to the first outlet pressure P4 and/or the first outlet temperature T3 of the outlet of the condensing device 23. As shown in FIG. 10, step S23 includes the following steps: The second control unit 25 converts the first outlet temperature T3 into a corresponding outlet pressure value by calculation, and the corresponding outlet pressure value or the first outlet pressure P4 is preset. The pressure threshold range Psetl is compared. If the corresponding outlet pressure value or first outlet pressure P4 is greater than the pressure threshold range, the capacity output of the condensing device 23 is increased. If right If the applied outlet pressure value or the first outlet pressure P4 is smaller than the pressure threshold range Pset1, the capacity output of the condensing device 23 is reduced. If the corresponding outlet pressure value or first outlet pressure P4 is within the pressure threshold range Pset1, the capacity output of the condensing device 23 is maintained.

[0088] It can be understood that if the condensing device 23 adopts an air cooling unit, that is, the condensing device 23 includes an outdoor fan 232 that is coupled between the compressor 22 and the second flow control valve 24 and the outdoor condenser 231. Then, the second control unit 25 can control the capacity output of the outdoor fan 232 according to the first outlet pressure P4 and/or the first outlet temperature T3 of the outlet of the outdoor condenser 231, that is, control the rotational speed of the outdoor fan 232.

[0089] If the condensing device 23 employs a water-cooling unit, the condensing unit 23 includes an outdoor condenser 231 connected between the compressor 22 and the second flow control valve 24, and a cooling water output device 233 coupled to the outdoor condenser 231, The second control unit 25 can control the capacity output of the control cooling water output device 233 according to the first outlet pressure P4 and/or the first outlet temperature T3 of the outlet of the outdoor condenser 231.

[0090] and / or

[0091] S24: controlling the temperature Xr2 of the second flow control valve 24 according to the outdoor outlet superheat degree SHr2 of the second heat exchange conduit 212. As shown in FIG. 11, step S24 includes the following steps: The second control unit 25 compares the outdoor outlet superheat degree S Hr2 with a preset second superheat degree threshold range SHset2, if the outdoor outlet superheat degree SHr2 is smaller than the second superheat degree threshold range SHset2, then reduces the twist Xr2 of the second flow control valve 24. If the outdoor outlet superheat SHr2 is greater than the second superheat threshold range SHset2, the twist Xr2 of the second flow control valve 24 is increased. If the outdoor outlet superheat degree SHr2 is within the second superheat degree threshold range SHset2, the twist Xr2 of the second flow control valve 24 is maintained.

[0092] and / or

S25: The second control unit 25 controls the capacity output of the refrigerant pump 26 in accordance with the temperature Xr2 of the second flow rate control valve 24. As shown in FIG. 12, step S25 includes the following steps: Comparing the twist Xr2 of the second flow control valve 24 with a preset threshold threshold range Xset1, if the twist Xr2 of the second flow control valve 24 is less than the threshold threshold range Xsetl, the capacity output of the refrigerant pump 26 is reduced; if the temperature Xr2 of the second flow control valve 24 is greater than the threshold threshold range Xset1, the capacity output of the refrigerant pump 26 is increased; if the second flow control valve 24 is The temperature Xr2 is within the threshold threshold range Xset1, and the capacity output of the refrigerant pump 26 is maintained.

[0094] It can be understood that the second control unit 25 does not affect the control of the second flow control valve 24, the condensing device 23, and the compressor 22, that is, there is no order between the two, and is independently controlled according to respective control conditions. specifically The second control unit 25 controls the second flow rate control valve 24, the condensing unit 23, and the compressor 22 by a PID control method or a P control method.

According to the control method of the multi-refrigeration system with natural cooling provided by the present invention, the first control unit 13 obtains the indoor cooling demand CFrl, the indoor outlet superheat degree SHrl, and the differential pressure ΔΡ before and after the transfer pump 32, and The first flow control valve 11 and the transfer pump 32 are independently controlled; the second control unit 25 actually obtains the outdoor cooling demand CFr2, the first outlet pressure P4 of the outlet of the condensing device 23, and/or the first outlet temperature T3, and the outdoor outlet superheat SH R2 and the second flow control valve 24 have a temperature Xr2, and independently control the temperature of the compressor 22, the condensing device 23, the second flow control valve 24, and the compressor 26. The control method employs a compressor in the outdoor refrigeration unit 20 As the refrigeration power, the refrigerant pump can effectively improve the cooling energy efficiency, and the control method is simple and easy to implement, and the corresponding components of the multi-cooling system with natural cooling are independently controlled to avoid energy waste caused by the associated control of multiple components.

The present invention has been described in terms of several specific embodiments, and those skilled in the art will understand that various modifications and equivalents can be made to the present invention without departing from the scope of the invention. In addition, various modifications may be made to the invention without departing from the scope of the invention. Therefore, the invention is not limited to the specific embodiments disclosed, but all the embodiments falling within the scope of the appended claims.

Claims

[Claim 1] An air conditioner comprising a fan module (1) and a body (2), and a top (21) or a bottom (22) of the body (2) is provided with an air supply port (23) The fan module (1) is detachably connected to the top (21) or the bottom (22) of the body (2). [Claim 2] The air conditioner according to claim 1, characterized in that the front side (11) or the back side (12) of the fan module (1) is provided with an air outlet (13). [Claim 3] The air conditioner according to claim 2, wherein the top (21) of the body (2) is provided with a blower port (23), and the front side (11) of the fan module (1) is set There is an air outlet (13), and the fan module (1) is detachably connected to the top (21) of the body (2). [Claim 4] The air conditioner according to claim 2, wherein the top (21) of the body (2) is provided with a blower (23), and the back (12) of the fan module (1) is set There is an air outlet (13), and the fan module (1) is detachably connected to the top (21) of the body (2). [Claim 5] The air conditioner according to claim 2, wherein a bottom portion (22) of the body (2) is provided with a blower port (23), and a front surface (11) of the fan module (1) is disposed There is an air outlet (13), and the fan module (1) is detachably connected to the bottom (22) of the body (2). [Claim 6] The air conditioner according to claim 2, wherein the bottom (22) of the body (2) is provided with a blower (23), and the back (12) of the fan module (1) is set There is an air outlet (13), and the fan module (1) is detachably connected to the bottom (22) of the body (2). [Claim 7] The air conditioner according to any one of claims 1 to 6, wherein a front surface (11) of the body (2) is provided with a mesh (24), and the air conditioner further includes a hanging a filter mesh behind the mesh (24), and a sheet metal member hanging behind the mesh (24) for blocking the mesh (24). [Attachment 8] The air conditioner according to any one of claims 1 to 6, wherein the fan module (1) is fixed to a top (21) or a bottom (22) of the body (2) by a screw connection. ). [Claim 9] The air conditioner according to any one of claims 1 to 6, characterized in that the air outlet (23) of the top (21) or the bottom (22) of the body (2) is provided with a detachable Blocking plate. [Claim 10] The air conditioner according to any one of claims 1 to 6, wherein a projected area of the fan module (1) at a top (21) or a bottom (22) of the body (2) Both cover the air supply opening (23). Claim

A multi-connected refrigeration system with natural cooling, characterized in that it comprises at least one indoor refrigeration unit (10), at least one outdoor refrigeration unit (20), and a connection between the indoor refrigeration unit (10) and the The cold conveying unit (30) of the outdoor refrigeration unit (20);

The cold conveying unit (30) includes a liquid storage device (31) for storing the refrigerant and a transfer pump (32) connected to the liquid storage device (31);

The outdoor refrigeration unit (20) includes a partition wall heat exchange unit (21), and the partition wall heat exchange unit (21) includes mutually independent first heat exchange tubes (211) and second exchange for heat exchange. a heat pipe (212); the indoor refrigeration unit (10), the cold conveying unit (30) and the first heat exchange pipe (211) form a closed loop;

The indoor refrigeration unit (10) includes a first flow control valve (11) connected to an outlet of the transfer pump (32), an outlet of the first flow control valve (U), and the first heat exchange conduit ( 211) an indoor evaporator (12) connected to the inlet, and a first control unit (13), the first control unit (13) and the first flow control valve (11) and the transfer pump (32) Connected, for controlling the start and stop of the first flow control valve (U) and the transfer pump (32) according to indoor refrigeration demand, and controlling the first according to the indoor outlet superheat of the indoor evaporator (12) The opening degree of the flow control valve (11) controls the capacity output of the transfer pump (32) according to the pressure difference before and after the transfer pump (32);

The outdoor refrigeration unit (20) further includes a compressor (22) connected to an outlet of the second heat exchange conduit (212), a condensing device (23) connected to an outlet of the compressor (22), and a refrigerant pump (26) connected to the outlet of the condensing device (23), a second flow control valve (24) connected to the inlet of the refrigerant pump (26) and the inlet of the second heat exchange conduit (212), and a second Control Department (25), cited by joining (Rule 20.6) The second control unit (25) is connected to the compressor (22), the second flow control valve (24), the condensing device (23) and the refrigerant pump (26), respectively Controlling the start-stop or capacity output of the compressor (22) according to outdoor cooling demand, controlling the capacity of the condensing device (23) according to the first outlet pressure and/or the first outlet temperature of the outlet of the condensing device (23) Outputting, controlling the opening degree of the second flow control valve (24) according to the outdoor outlet superheat of the second heat exchange conduit (212), and controlling the opening according to the opening of the second flow control valve (24) The capacity output of the refrigerant pump (26).

2. A multi-unit refrigeration system with natural cooling according to claim 1, characterized in that said at least one indoor refrigeration unit (10) comprises at least two indoor refrigeration units (10) arranged in parallel.

3. The multi-refrigeration system with natural cooling according to claim 2, further comprising an indoor fan (14) cooperating with the indoor evaporator (12), the first control unit (13) The indoor fan (14) is connected to control the opening or capacity output of the indoor fan (14) according to the indoor cooling demand.

The multiple cooling system with natural cooling according to any one of claims 1 to 3, characterized in that the outdoor refrigeration unit (20) comprises at least two outdoor refrigeration units (20) arranged in series. Connecting the first heat exchange tubes (211) of at least two outdoor refrigeration units (20); or

The outdoor refrigeration unit (20) includes at least two outdoor refrigeration units (20) arranged in parallel, the at least two outdoor refrigeration units (20) sharing a partition wall heat exchange unit (21) and a a second flow control valve (24), wherein at least two compressors (22) of the at least two outdoor refrigeration units (20) are connected in parallel to the second heat exchange conduit (212) of the partition wall heat exchange unit (21) An outlet, at least two condensing devices (23) connected in parallel to the at least two compressor (22) outlets and the second flow control valve (24) inlet; or

The outdoor refrigeration unit (20) includes at least two outdoor refrigeration units (20) arranged in parallel, which are incorporated by reference (Rule 20.6) The outlets of the first heat exchange tubes (211) of the at least two outdoor refrigeration units (20) are respectively connected to the liquid storage device (31).

5. The multi-refrigeration system with natural cooling according to claim 4, wherein the condensing device (23) comprises a compressor (22) connected to the second flow control valve (24) An outdoor fan (232) interposed between the outdoor condenser (231) and the outdoor condenser (231), and the second control unit (25) is connected to the outdoor fan (232) for The first outlet pressure of the outlet of the outdoor condenser (231) and/or the first outlet temperature controls the capacity output of the outdoor fan (232); or

The condensing device (23) includes an outdoor condenser (231) coupled between the compressor (22) and the second flow control valve (24) and cooling associated with the outdoor condenser (231) The water output device (233), the second control unit (25) controls the capacity output of the cooling water output device (233).

6. A control method for a multi-connected refrigeration system with natural cooling, characterized in that it comprises the following steps performed by the first control unit (13):

S11: obtaining indoor refrigeration demand, indoor outlet superheat of the indoor evaporator (12), and pressure difference before and after the pump (32);

S12: controlling start and stop of the first flow control valve (11) and the transfer pump (32) according to indoor refrigeration demand;

S13: controlling an opening degree of the first flow control valve (11) according to an indoor outlet superheat of the indoor evaporator (12);

S14: controlling the capacity output of the transfer pump (32) according to a pressure difference before and after the transfer pump (32);

It also includes the following steps performed by the second control unit (25): Invoicing (Rule 20.6) S21: determining an outdoor cooling demand, a first outlet pressure of the outlet of the condensing device (23) and/or a first outlet temperature, an outdoor outlet superheat of the second heat exchange conduit (212), and an opening of the second flow control valve (24) degree;

S22: controlling start/stop or capacity output of the compressor (22) according to outdoor cooling demand;

S23: controlling the capacity output of the condensing device (23) according to the first outlet pressure and/or the first outlet temperature of the outlet of the condensing device (23);

S24: controlling an opening degree of the second flow control valve (24) according to an outdoor outlet superheat of the second heat exchange conduit (212);

S25: Controlling the capacity output of the refrigerant pump (26) according to the opening degree of the second flow control valve (24).

The control method of the multi-refrigeration system with natural cooling according to claim 6, wherein the step S11 comprises: collecting an indoor ambient temperature, and the indoor ambient temperature and the first preset temperature value Comparing, calculating a temperature difference between the two to determine the indoor refrigeration demand; collecting a second outlet temperature and/or a second outlet pressure of the outlet of the indoor evaporator (12), calculating to determine the indoor outlet superheat; The pump inlet pressure and the pump outlet pressure of the transfer pump (32) are calculated, and the pressure difference before and after the pump (32) is obtained.

8. The method of controlling a multi-connected refrigeration system with natural cooling according to claim 7, wherein:

The step S12 includes: comparing the indoor cooling demand with a preset first cooling threshold, and if the indoor cooling demand is greater than or equal to the first cooling threshold, controlling the first flow control valve (11) And the transfer pump (32) is activated, if not, controlling the first flow control valve (11) and the transfer pump (32) to stop working;

And/or incorporation (rule 20.6) The step S13 includes: comparing the indoor outlet superheat degree with a preset first superheat degree threshold range, and if the indoor outlet superheat degree is less than the first superheat degree threshold range, decreasing the first flow rate Opening the control valve (U); if the indoor outlet superheat is greater than the first superheat threshold range, increasing the opening of the first flow control valve (11); if the indoor outlet superheat Maintaining an opening degree of the first flow control valve (11) within the first superheat threshold range;

and / or

The step S14 includes: comparing the pressure difference value with a preset pressure difference threshold range, and if the pressure difference value is smaller than the pressure difference threshold range, reducing the capacity output of the delivery pump (32); And the pressure difference value is greater than the pressure difference threshold range, increasing a capacity output of the transfer pump (32); if the pressure difference value is within the pressure difference threshold range, maintaining the transfer pump ( 32) capacity output.

A control method for a multi-connected refrigeration system with natural cooling according to any one of claims 6-8, characterized in that

The step S21 includes: collecting a third outlet temperature, a third outlet pressure, a first inlet pressure or a first inlet temperature of the outlet of the first heat exchange conduit (211), and the third outlet temperature and the third outlet pressure Calculating a first inlet pressure or a first inlet temperature and a second preset temperature value to obtain the outdoor refrigeration demand; collecting a fourth outlet temperature and/or a fourth outlet pressure of the second heat exchange conduit (212) outlet Calculated to determine the outdoor outlet superheat.

10. The method of controlling a multi-connected refrigeration system with natural cooling according to claim 9, wherein:

The step S22 includes: comparing the outdoor cooling demand with a preset second cooling threshold, and if the outdoor cooling demand is greater than the second cooling threshold, controlling the starting the compressor (22) and adjusting The capacity output of the compressor (22), if not, the compressor (22) is controlled to be invoked (Rule 20.6) stop working;

and / or

The step S23 includes: converting the first outlet temperature into a corresponding outlet pressure value by calculation, and comparing the corresponding outlet pressure value or the first outlet pressure with a preset pressure threshold range; If the corresponding outlet pressure value or the first outlet pressure is greater than the pressure threshold range, increasing the capacity output of the condensing device (23); if the corresponding outlet pressure value or the first outlet pressure Less than the pressure threshold range, reducing the capacity output of the condensing device (23); maintaining the condensation if the corresponding outlet pressure value or the first outlet pressure is within the pressure threshold range Capacity output of the device (23);

and / or

The step S24 includes: comparing the outdoor outlet superheat degree with a preset second superheat degree threshold range, and if the outdoor outlet superheat degree is less than the second superheat degree threshold range, decreasing the second flow rate Opening the control valve (24); if the outdoor outlet superheat is greater than the second superheat threshold range, increasing the opening of the second flow control valve (24); if the outdoor outlet superheat Maintaining an opening degree of the second flow control valve (24) within the second superheat degree threshold range;

and / or

The step S25 includes: comparing an opening degree of the second flow control valve (24) with a preset opening degree threshold range, and if the opening degree of the second flow control valve (24) is smaller than an opening degree threshold range, And reducing the capacity output of the refrigerant pump (26); if the opening degree of the second flow control valve (24) is greater than the opening threshold range, increasing the capacity output of the refrigerant pump (26); If the opening of the second flow control valve (24) is within the opening threshold range, the capacity output of the refrigerant pump (26) is maintained. Incorporation (Rules 20. 6)