CN104266417A - Refrigeration operating method of multi-split air conditioner in high temperature environment - Google Patents

Refrigeration operating method of multi-split air conditioner in high temperature environment Download PDF

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Publication number
CN104266417A
CN104266417A CN201410519990.XA CN201410519990A CN104266417A CN 104266417 A CN104266417 A CN 104266417A CN 201410519990 A CN201410519990 A CN 201410519990A CN 104266417 A CN104266417 A CN 104266417A
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China
Prior art keywords
heat exchanger
indoor
outdoor
refrigerant
units
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Application number
CN201410519990.XA
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CN104266417B (en
Inventor
侯丽峰
涂虬
李朝珍
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves

Abstract

The invention discloses a refrigeration operating method of a multi-split air conditioner in high temperature environment. The refrigeration operating method includes the following specific steps: a, a refrigerant air pipe (2) with a bypass solenoid valve (1) is used to communicate a second valve port of a four-way reversing valve (3) and an input of a water flowing shell-and-coil heat exchanger (4), and a refrigerant liquid pipe (5) is used to communicate an output of the shell-and-coil heat exchanger (4) with an output of an outdoor heat exchanger (6); b, the bypass solenoid valve (1) is opened when the outdoor environment temperature is equal to or larger than 35 degrees centigrade or the number of started indoor units is more than 80 percent of the total number of the indoor units; c, the bypass solenoid valve (1) is closed when the outdoor environment temperature is reduced to be lower than 35 degrees centigrade or the number of the started indoor units is reduced to be no more than 50 percent of the total number of the indoor units. The refrigeration operating method can enhance the heat exchange effect and improve the energy efficiency.

Description

Multi-connected machine refrigerating operation method in high temperature environments
Technical field
The present invention relates to VRF Air Conditioning System, is specifically a kind of multi-connected machine refrigerating operation method in high temperature environments.
Background technology
The VRF Air Conditioning System of prior art is called for short multi-connected machine, and it comprises off-premises station, multiple indoor set parallel with one another and connects two refrigerant circulation house stewards of each indoor set and off-premises station.Off-premises station is communicated with the multiple indoor sets after parallel connection by two refrigerant circulation house stewards.
Each off-premises station comprises compressor, oil eliminator, four-way change-over valve, outdoor heat exchanger (being condenser during refrigeration) and gas-liquid separator.Compressor outlet is communicated with the entrance of oil eliminator, the outlet of oil eliminator is communicated with the first valve port of four-way change-over valve, four-way change-over valve second valve port is communicated with outdoor heat exchanger one end, one of circulating in house steward is communicated with for the outdoor heat exchanger other end and two refrigerants, and another root refrigerant circulation house steward in two refrigerant circulation house stewards is communicated with four-way change-over valve the 3rd valve port of each off-premises station, four-way change-over valve the 4th valve port is connected with the entrance of gas-liquid separator, and the outlet of gas-liquid separator is communicated with suction port of compressor.
Each indoor set comprises interior organic electronic expansion valve and indoor heat exchanger (being evaporimeter during refrigeration), one end of indoor heat exchanger is communicated with one end of interior organic electronic expansion valve, one that the other end and two refrigerants of interior organic electronic expansion valve circulate in house steward is communicated with, and the house steward that circulates is communicated with for the other end and two refrigerants another root refrigerant circulated in house steward of indoor heat exchanger.
During refrigeration mode, the first valve port of four-way change-over valve is communicated with the second valve port, and the 3rd valve port is communicated with the 4th valve port, and namely refrigerant is along compressor, outdoor heat exchanger, indoor heat exchanger, the circulation of this route of compressor.
At present, the ambient temperature range of multi-connection operation is between-20 DEG C to 52 DEG C, and during refrigeration, the refrigeration that environment temperature has generally exceeded 35 DEG C of units just obviously declines.Because along with the rising of environment temperature, off-premises station heat transfer effect declines, and cooling medium liquefaction deficiency causes system pressure to raise, outdoor fan oepration at full load, and compressor power output rises, and power consumption increases, and efficiency is very low.Therefore in megathermal climate area as the Middle East, the refrigeration of multi-connected machine is poor.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of multi-connected machine refrigerating operation method in high temperature environments can strengthened heat transfer effect, improve efficiency.
Technical solution of the present invention is, provide a kind of multi-connected machine refrigerating operation method in high temperature environments, its concrete steps are as follows:
A, with one band bypass solenoid valve refrigerant tracheae the second valve port of four-way change-over valve is communicated with the entrance of a case tube heat exchanger of leaking water, with the outlet of cooling medium liquid pipe by case tube heat exchanger and the outlet of outdoor heat exchanger;
B, when the indoor set number of units of outdoor environment temperature >=35 DEG C or start exceedes 80 ﹪ of the total number of units of indoor set, open bypass solenoid valve, the part refrigerant that compressor is discharged flows into case tube heat exchanger and water heat exchange, and other a part of refrigerant still flows into outdoor heat exchanger by normal flow direction and carries out air-cooled heat exchange, last all refrigerants are aggregated into a refrigerant circulation house steward and flow into indoor set and freeze;
C, drop to less than 35 DEG C when outdoor environment temperature, or when the indoor set number of units of start reduces to 50 ﹪ being no more than the total number of units of indoor set, close bypass solenoid valve, whole refrigerants that compressor is discharged again flow into outdoor heat exchanger according to normal flow direction and carry out air-cooled heat exchange.
This controlling party ratio juris is: when environment temperature be no more than 35 DEG C or start indoor set number of units be no more than 80 ﹪ of indoor set total number of units time, the load of system is less, unit normally runs its exchange capability of heat can meet system requirements, under this state efficiency also high, energy consumption is also little; Once environment temperature more than 35 DEG C or the indoor set number of units of start exceed 80 ﹪ of the total number of units of indoor set, the heat transfer effect of outdoor heat exchanger just starts to decline, system high pressure pressure increase, outdoor fan oepration at full load, compressor power output rises, and at this time opens bypass solenoid valve, allow a part of refrigerant and water heat exchange, and water temperature is lower than air, specific heat ratio air large, heat transfer effect can be improved, fast-refrigerating; Simultaneously with 35 DEG C of descriptions, after outdoor temperature reduces lower than 35 DEG C or system loading, close bypass solenoid valve, recover normal operation and just can meet refrigeration demand.
Adopt above method, multi-connected machine of the present invention refrigerating operation method in high temperature environments compared with prior art, has the following advantages:
By this control method, the heat transfer effect under hot environment can be guaranteed, effectively reduce system high pressure pressure, reduce compressor power output, reduce fan operating load, improving energy efficiency, save energy consumption.
Accompanying drawing explanation
Fig. 1 is the systematic schematic diagram of multi-connected machine of the present invention refrigerating operation method in high temperature environments.
Shown in figure 1, bypass solenoid valve, 2, refrigerant tracheae, 3, four-way change-over valve, 4, case tube heat exchanger, 5, cooling medium liquid pipe, 6, outdoor heat exchanger, 7, compressor, 8, refrigerant circulation house steward, 9, tank, the 10, first refrigerant pipe, the 11, second refrigerant pipe, 12, water inlet pipe.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, multi-connected machine of the present invention refrigerating operation method in high temperature environments, its concrete steps are as follows.
A, with the refrigerant tracheae 2 of a band bypass solenoid valve 1, second valve port of four-way change-over valve 3 to be communicated with the entrance of a case tube heat exchanger of leaking water 4, with the outlet of a cooling medium liquid pipe 5 by the outlet of case tube heat exchanger 4 and outdoor heat exchanger 6.
Case tube heat exchanger 4 is positioned at a tank 9, and tank 9 is provided with water inlet pipe 12, and the water in tank 9 by thermal evaporation, then relies on water inlet pipe 12 moisturizing.
Be provided with the first conventional refrigerant pipe 10 between second valve port of four-way change-over valve 3 and outdoor heat exchanger 6 entrance, the entrance of refrigerant tracheae 2 is communicated with the first refrigerant pipe 10, and the outlet of refrigerant tracheae 2 is communicated with the entrance of case tube heat exchanger 4.
The outlet of outdoor heat exchanger 6 and that root refrigerant flowing to indoor set circulate house steward 8 entrance between be provided with the second conventional refrigerant pipe 11, the entrance of cooling medium liquid pipe 5 and the outlet of case tube heat exchanger 4, the outlet of cooling medium liquid pipe 5 is communicated with the second refrigerant pipe 11.
Saying in fact, is exactly a case tube heat exchanger 4 in parallel on outdoor heat exchanger 6.
B, when the indoor set number of units of outdoor environment temperature >=35 DEG C or start exceedes 80 ﹪ of the total number of units of indoor set, open bypass solenoid valve 1, the part refrigerant that compressor 7 is discharged flows into case tube heat exchanger 4 and water heat exchange, and other a part of refrigerant still flows into outdoor heat exchanger 6 by normal flow direction and carries out air-cooled heat exchange, last all refrigerants are aggregated into a refrigerant circulation house steward 8 and flow into indoor set and freeze;
C, drop to less than 35 DEG C when outdoor environment temperature, or when the indoor set number of units of start reduces to 50 ﹪ being no more than the total number of units of indoor set, close bypass solenoid valve 1, whole refrigerants that compressor 7 is discharged again flow into outdoor heat exchanger 6 according to normal flow direction and carry out air-cooled heat exchange.

Claims (1)

1. a multi-connected machine refrigerating operation method in high temperature environments, is characterized in that: its concrete steps are as follows:
A, with the refrigerant tracheae (2) of band bypass solenoid valve (1), the entrance of the second valve port of four-way change-over valve (3) with a case tube heat exchanger of leaking water (4) to be communicated with, with the outlet of a cooling medium liquid pipe (5) by the outlet of case tube heat exchanger (4) and outdoor heat exchanger (6);
B, when the indoor set number of units of outdoor environment temperature >=35 DEG C or start exceedes 80 ﹪ of the total number of units of indoor set, open bypass solenoid valve (1), the part refrigerant that compressor (7) is discharged flows into case tube heat exchanger (4) and water heat exchange, and other a part of refrigerant still carries out air-cooled heat exchange by normal flow direction inflow outdoor heat exchanger (6), last all refrigerants are aggregated into refrigerant circulation house steward (8) inflow indoor set and freeze;
C, drop to less than 35 DEG C when outdoor environment temperature, or when the indoor set number of units of start reduces to 50 ﹪ being no more than the total number of units of indoor set, close bypass solenoid valve (1), whole refrigerants that compressor (7) is discharged again flow into outdoor heat exchanger (6) according to normal flow direction and carry out air-cooled heat exchange.
CN201410519990.XA 2014-09-30 2014-09-30 Refrigeration operating method of multi-split air conditioner in high temperature environment Active CN104266417B (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108361834A (en) * 2018-02-06 2018-08-03 青岛海尔空调器有限总公司 One drags control method, device and the air conditioner of more air-conditionings
CN109899927A (en) * 2019-03-20 2019-06-18 广东美的暖通设备有限公司 Reduce the method and device thereof of multi-line system refrigerant flow noise
CN111595001A (en) * 2020-05-18 2020-08-28 广东美的暖通设备有限公司 Air conditioning system, control method thereof, control device thereof and readable storage medium

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002147883A (en) * 2000-11-16 2002-05-22 Chofu Seisakusho Co Ltd Hot-water refrigerant heating air conditioner and method for controlling the same
CN200940979Y (en) * 2006-06-08 2007-08-29 特灵空调器有限公司 Power adjustable water cooling multi-coupling air conditioner
CN201074924Y (en) * 2007-06-27 2008-06-18 王全龄 Water cold air source heat pump air conditioner
CN201819476U (en) * 2010-08-27 2011-05-04 宁波奥克斯电气有限公司 Direct-current frequency conversion air-conditioner with waste heat recovery device
JP2011226658A (en) * 2010-04-15 2011-11-10 Espec Corp Cooling device and environmental test device equipped with the same
CN202171298U (en) * 2011-08-02 2012-03-21 南京天加空调设备有限公司 Water-cooled digital multi-connection type air conditioning unit
CN102445017A (en) * 2011-09-16 2012-05-09 西安君生实业有限公司 Host machine of air cooling and water cooling type cold-hot water air conditioner
CN102589048A (en) * 2012-05-01 2012-07-18 周玉涛 Water-cooling multi-connected unit and working manner thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002147883A (en) * 2000-11-16 2002-05-22 Chofu Seisakusho Co Ltd Hot-water refrigerant heating air conditioner and method for controlling the same
CN200940979Y (en) * 2006-06-08 2007-08-29 特灵空调器有限公司 Power adjustable water cooling multi-coupling air conditioner
CN201074924Y (en) * 2007-06-27 2008-06-18 王全龄 Water cold air source heat pump air conditioner
JP2011226658A (en) * 2010-04-15 2011-11-10 Espec Corp Cooling device and environmental test device equipped with the same
CN201819476U (en) * 2010-08-27 2011-05-04 宁波奥克斯电气有限公司 Direct-current frequency conversion air-conditioner with waste heat recovery device
CN202171298U (en) * 2011-08-02 2012-03-21 南京天加空调设备有限公司 Water-cooled digital multi-connection type air conditioning unit
CN102445017A (en) * 2011-09-16 2012-05-09 西安君生实业有限公司 Host machine of air cooling and water cooling type cold-hot water air conditioner
CN102589048A (en) * 2012-05-01 2012-07-18 周玉涛 Water-cooling multi-connected unit and working manner thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108361834A (en) * 2018-02-06 2018-08-03 青岛海尔空调器有限总公司 One drags control method, device and the air conditioner of more air-conditionings
CN109899927A (en) * 2019-03-20 2019-06-18 广东美的暖通设备有限公司 Reduce the method and device thereof of multi-line system refrigerant flow noise
CN111595001A (en) * 2020-05-18 2020-08-28 广东美的暖通设备有限公司 Air conditioning system, control method thereof, control device thereof and readable storage medium

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