CN101957045A - Method for automatically adjusting cooling water flow of air conditioning unit - Google Patents
Method for automatically adjusting cooling water flow of air conditioning unit Download PDFInfo
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- CN101957045A CN101957045A CN2010102812551A CN201010281255A CN101957045A CN 101957045 A CN101957045 A CN 101957045A CN 2010102812551 A CN2010102812551 A CN 2010102812551A CN 201010281255 A CN201010281255 A CN 201010281255A CN 101957045 A CN101957045 A CN 101957045A
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Abstract
The invention discloses a method for automatically adjusting the cooling water flow of an air conditioning unit, which can be used for better exerting the performance of the air conditioning unit and saving energy. The method comprises the following steps: (1) a normally open water pipe is arranged on one end of a cooling water outlet of a condenser of the water-cooled air conditioning unit, and two parallel circuits on the normally open water pipe are respectively connected with a pipeline structure of a two-way water valve; (2) a high-pressure sensor arranged on the output end of a compressor of the air conditioning unit detects the pressure of a condensing medium at the high-pressure side of a refrigerating system in real time and transmits a detection signal to a controller of the air conditioning unit; and (3) the controller of the air conditioning unit sends a control signal according to the pressure change of the condensing medium to control the opening and closing of the first two-way valve and the second two-way valve, and the water flow is controlled in four stages. Compared with the prior art, the method regulates the water flow by detecting the pressure of the condensing medium, and the technical effects of more reliability, more excellent performance and higher energy efficiency of the air conditioning unit are finally realized.
Description
Technical field
The present invention relates to the control method of air-conditioning unit, particularly a kind of control method of air-conditioning unit cooling water discharge.
Background technology
Along with the progress and the development of science and technology of society, air-conditioner applies to family and public place more and more widely as a kind of equipment of building comfortable human settlement.Large-scale commercialization and central air conditioner system generally adopt water as cooling medium, dispose heat-exchange apparatus such as water pump, cooling tower simultaneously.Most air-conditioning units of prior art all use fixing discharge, be equipped with the water pump of firm discharge, when the air-conditioning unit normally moves, make water pipe a part of water of draining when discharge is excessive, not only cause the waste of the many consumes power of water pump, and the runnability of air-conditioning unit do not give full play of, and particularly the air-conditioning unit load is less than 100% o'clock, and is all the more so.
Summary of the invention
The purpose of this invention is to provide a kind of air-conditioning unit cooling water discharge Automatic adjustment method, the technical problem that solve is better to bring into play Properties of Air-conditioning Unit, and energy-conservation.
The present invention is by the following technical solutions: a kind of air-conditioning unit cooling water discharge Automatic adjustment method, may further comprise the steps: one, coolant outlet one end at Water cooled air conditioners unit condenser is provided with the normal open water pipe, and two-way in parallel is in series with the pipeline configuration of two water-through valves respectively on the normal open water pipe; Two, the high pressure sensor that is arranged on air-conditioning unit compressor output end detects the cooling medium pressure of refrigeration system high pressure side in real time, and detection signal is passed to the air conditioner group controller; Three, the air conditioner group controller sends control signal according to the variation of cooling medium pressure, controls the open and close of the 1st two-port valve, the 2nd two-port valve, and the branch level Four is carried out discharge control.
The ratio of the sectional area of normal open water pipe of the present invention, the 1st pipeline, the 2nd pipeline is: 20: 30: 50.
Level Four discharge of the present invention is respectively: one-level, cooling medium pressure are 10.0bar to less than 11.5bar the time, and discharge is 20% of total flow; Secondary, cooling medium pressure be more than or equal to 11.5bar to less than 12.5bar the time, flow is 50% of a total flow; Three grades, cooling medium pressure be more than or equal to 12.5bar to less than 13.5bar the time, flow is 70% of a total flow; Level Four, cooling medium pressure are during more than or equal to 13.5bar, and flow is 100%.
Level Four discharge control of the present invention realizes in the following ways: one-level, and the 1st, 2 two-port valves cut out, the water flowing of normal open water pipe; Secondary, the 1st two-port valve is opened, and the 2nd two-port valve cuts out, normal open water pipe and the 1st two-port valve water flowing; Three grades, the 1st two-port valve cuts out, and the 2nd two-port valve is opened, normal open water pipe and the 2nd two-port valve water flowing; Level Four, normal open water pipe, the 1st two-port valve and the 2nd two-port valve are opened.
Cooling water inlet one end of Water cooled air conditioners unit condenser of the present invention is provided with the hydraulic pressure sensor that detects water inlet pipe hydraulic pressure, hydraulic pressure sensor passes to hydraulic signal the frequency-variable controller of variable frequency pump, frequency-variable controller compares the setting value of hydraulic pressure and actual pressure, the frequency of supply signal of variable frequency pump is regulated in output, change the frequency of supply of variable frequency pump, hydraulic pressure is adjusted to setting value.
Air-conditioner host of the present invention adopts air-conditioning unit MDS-W, normal open water pipe bore is 7.92mm, the bore of the 1st pipeline in parallel is 10mm, and the bore of the 2nd pipeline in parallel is 12mm, and the 1st two-port valve adopts FCV2314G, the 2nd two-port valve adopts FCV2417G, high pressure sensor adopts NSK-BA042D-178, and the air conditioner group controller adopts MDS-P/M, and hydraulic pressure sensor adopts PTJ204, variable frequency pump MHI 402, frequency-variable controller adopts CHF100-1R5G-S2.
The present invention compared with prior art by detecting cooling medium pressure, regulates the size of discharge, finally realizes the technique effect that the air-conditioning unit operation is more reliable, performance is more superior and more energy-conservation.
Description of drawings
Fig. 1 is the system diagram of air-conditioning unit of the present invention.
Fig. 2 is an assembling stereogram of the present invention.
Fig. 3 is a level Four water yield control pressure schematic diagram of the present invention.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
The applicant finds after deliberation, different cooling medium pressure cooperates suitable discharge that the steady operation of runnability, energy consumption and the air-conditioning unit of whole air-conditioning unit is had the significant effects effect, so the present invention adopts the method for regulating discharge according to cooling medium pressure.
Air-conditioning unit cooling water discharge Automatic adjustment method of the present invention may further comprise the steps:
One, as depicted in figs. 1 and 2, coolant outlet one end at Water cooled air conditioners unit condenser is provided with normal open water pipe 3, two-way in parallel is in series with the pipeline configuration of two water-through valves 1,2 respectively on the normal open water pipe, and the ratio of the sectional area of normal open water pipe, the 1st pipeline, the 2nd pipeline is: 20: 30: 50.
Two, be arranged on the high pressure sensor 4 real-time cooling medium pressure that detect the refrigeration system high pressure side of air-conditioning unit compressor output end, and detection signal is passed to the air conditioner group controller.
Three, the air conditioner group controller sends control signal according to the variation of cooling medium pressure, controls the open and close of the 1st two-port valve the 1, the 2nd two-port valve 2, and the branch level Four is carried out discharge control, and level Four discharge is respectively:
(1) cooling medium pressure is 10.0bar to less than 11.5bar the time, and the 1st, 2 two- port valves 1,2 all cut out, and have only the water flowing of normal open water pipe, and discharge is 20% (one-level) of total flow;
(2) cooling medium pressure be more than or equal to 11.5bar to less than 12.5bar the time, the 1st two-port valve 1 is opened, the 2nd two-port valve 2 cuts out, normal open water pipe and 1 water flowing of the 1st two-port valve, flow is 50% (secondary) of total flow;
(3) cooling medium pressure be more than or equal to 12.5bar to less than 13.5bar the time, the 1st two-port valve 1 cuts out, the 2nd two-port valve 2 is opened, normal open water pipe and 2 water flowings of the 2nd two-port valve, flow is 70% (three grades) of total flow;
(4) cooling medium pressure is during more than or equal to 13.5bar, and normal open water pipe, the 1st two-port valve 1 and the 2nd two-port valve 2 are opened, and flow is 100% (level Four).
Four, the hydraulic pressure sensor 5 that is arranged on cooling water inlet one end of Water cooled air conditioners unit condenser detects the hydraulic pressure of water inlet pipes, hydraulic signal is passed to the frequency-variable controller of variable frequency pump, frequency-variable controller compares the setting value of hydraulic pressure and actual pressure, the frequency of supply signal of water pump is regulated in output, change the frequency of supply of variable frequency pump 6, control discharge is adjusted to setting value with hydraulic pressure.
Under the assembled state of the open and close of the 1st, 2 different two- port valves 1,2, if water pump output discharge does not change, can cause that the change of water system differential water pressures is big or diminish, therefore adopt hydraulic pressure sensor that hydraulic signal is passed to frequency-variable controller and carry out the discharge adjusting, make final discharge be controlled at unit operation, reach the energy-conservation effect of air-conditioning unit than on the preferable cooling medium pressure.
When discharge is excessive, it is big that water inlet pressure also becomes thereupon, and hydraulic pressure sensor sends signal to frequency-variable controller, after frequency-variable controller compares according to the setting value of hydraulic pressure and actual pressure, the variable frequency pump frequency is turned down, identical up to the water inlet pressure of reality with setting value.When discharge is too small, water inlet pressure also diminishes thereupon, and hydraulic pressure sensor sends signal to frequency-variable controller, after frequency-variable controller compares according to the setting value of hydraulic pressure and actual pressure, the variable frequency pump frequency is transferred greatly, identical up to the water inlet pressure of reality with setting value.
The relation that discharge is directly proportional with the frequency of variable frequency pump, the different air-conditioning unit cooling water system discharge and the frequency of variable frequency pump have the relation of different proportion, need to draw out according to concrete unit the relation line of the frequency proportions of its discharge and variable frequency pump.
As shown in Figure 3, solid line is the pressure corresponding points that two-port valve is opened among the figure, and dotted line is the corresponding points that two-port valve cuts out, and ordinate is the two-port valve switch combination, and described level Four discharge control procedure is:
Opening process:
One-level: when cooling medium pressure during less than 11.5bar, the 1st two-port valve 1 and the 2nd two-port valve 2 are closed, and have only the normal open water pipe to connect water flowing, are the control of one-level discharge.
Secondary: when cooling medium pressure more than or equal to 11.5bar, during less than 12.5bar, the 1st two-port valve 1 is opened, the 2nd two-port valve 2 cuts out, the normal open water pipe is connected water flowing with the 1st two-port valve 1, is that secondary discharge is controlled.
Three grades: when cooling medium pressure more than or equal to 12.5bar, during less than 13.5bar, the 1st two-port valve 1 cuts out, the 1st two-port valve 2 is opened, the normal open water pipe is connected water flowings with the 2nd two-port valve 2, is that three grades of discharges are controlled.
Level Four: when cooling medium pressure during more than or equal to 13.5bar, the 1st two-port valve 1 and the 2nd two-port valve 2 are all opened, and normal open water pipe, the 1st two-port valve 1 and the 2nd two-port valve 2 are connected water flowings, are the control of level Four discharge.
Close closed procedure:
When cooling medium pressure when reducing to more than or equal to 13.5bar less than 12bar, the 1st two-port valve 1 cuts out, the 2nd two-port valve 2 is opened.
When cooling medium pressure continued to reduce to less than 11bar, the 1st two-port valve 1 was opened, and the 2nd two-port valve 2 cuts out.
When cooling medium pressure continued to reduce to less than 10bar, the 1st, 2 two- port valves 1,2 all cut out, and a normal open pipe is connected water flowing.
Embodiment, air-conditioner host adopts the digital varying capacity water-cooled combined air conditioners unit MDS-W120AR of Shenzhen Mcquay Air Conditioning Co., Ltd, normal open water pipe bore is 7.92mm, the bore of the 1st pipeline in parallel is 10mm, the bore of the 2nd pipeline in parallel is 12mm, form 20%, 50%, 70% and 100% level Four discharge adjustable structure, the 1st two-port valve 1 adopts the FCV2314G of Ao Weier science and technology (Shenzhen) Co., Ltd, the 2nd two-port valve 2 adopts the FCV2417G of Ao Weier science and technology (Shenzhen) Co., Ltd, cooling medium is monochlorodifluoromethane R22, high pressure sensor adopt Amada Co., Ltd. aigret palace make NSK-BA042D-178, the air conditioner group controller adopts the MDS-P/M of Ao Weier science and technology (Shenzhen) Co., Ltd, hydraulic pressure sensor adopts the PTJ204 type of the great prompt Electron equipment Co., Ltd in Foshan City, variable frequency pump adopts the MHI 402 type water pumps of prestige Leshan nurse inferior (Beijing) water pump system Co., Ltd, and frequency-variable controller adopts the CHF100-1R5G-S2 type of Yingweiteng Electric Co., Ltd., Shenzhen City.
Comparative Examples adopts the air-conditioning unit MDS-W120AR of Shenzhen Mcquay Air Conditioning Co., Ltd, and air-conditioning unit refrigerating capacity is 33kW, and specified discharge is 6.7m
3/ h, adopt type MHI 402 water pumps of prestige Leshan nurse inferior (Beijing) water pump system Co., Ltd, water pump rated power 0.8kW is identical with the embodiment water pump, adopts and with Yingweiteng Electric Co., Ltd., Shenzhen City model C HF100-1R5G-S frequency-variable controller water pump is carried out the variable frequency adjustment data.
At unit load is under the condition of 100%-20%, the Energy Efficiency Ratio of dynamic test embodiment and two kinds of methods of Comparative Examples, wherein, Energy Efficiency Ratio=air conditioner refrigerating amount/(power+pump power of air-conditioning unit), unit load is transferred the percentage of unit overall refrigerating effect for the refrigerating capacity duty of the indoor set of opening, embodiment and 62 indoor sets of Comparative Examples air-conditioning unit band are depicted as correlation curve figure.Unit load was 100% o'clock (being that indoor set is all opened), and the Energy Efficiency Ratio of Comparative Examples and embodiment equates, all is 3.98; When unit load 70% the time, the Energy Efficiency Ratio of Comparative Examples is 3.70, the Energy Efficiency Ratio of embodiment is 3.80; When unit load 50% the time, the Energy Efficiency Ratio of Comparative Examples is 3.61, the Energy Efficiency Ratio of embodiment is 3.89; When unit load 20% the time, the Energy Efficiency Ratio of Comparative Examples is 2.45, the Energy Efficiency Ratio of embodiment is 3.18.From experimental result as can be seen: under identical input energy condition, the Energy Efficiency Ratio of method of the present invention is greater than the Energy Efficiency Ratio of prior art.Method of the present invention has when giving full play to Properties of Air-conditioning Unit, more energy-conservation technique effect.
Claims (6)
1. air-conditioning unit cooling water discharge Automatic adjustment method, may further comprise the steps: one, coolant outlet one end at Water cooled air conditioners unit condenser is provided with normal open water pipe (3), and two-way in parallel is in series with the pipeline configuration of two water-through valves (1,2) respectively on the normal open water pipe; Two, the high pressure sensor (4) that is arranged on air-conditioning unit compressor output end detects the cooling medium pressure of refrigeration system high pressure side in real time, and detection signal is passed to the air conditioner group controller; Three, the air conditioner group controller sends control signal according to the variation of cooling medium pressure, controls the open and close of the 1st two-port valve (1), the 2nd two-port valve (2), and the branch level Four is carried out discharge control.
2. air-conditioning unit cooling water discharge Automatic adjustment method according to claim 1, it is characterized in that: the ratio of the sectional area of described normal open water pipe, the 1st pipeline, the 2nd pipeline is: 20: 30: 50.
3. air-conditioning unit cooling water discharge Automatic adjustment method according to claim 2, it is characterized in that: described level Four discharge is respectively: one-level, cooling medium pressure are 10.0bar to less than 11.5bar the time, and discharge is 20% of total flow; Secondary, cooling medium pressure be more than or equal to 11.5bar to less than 12.5bar the time, flow is 50% of a total flow; Three grades, cooling medium pressure be more than or equal to 12.5bar to less than 13.5bar the time, flow is 70% of a total flow; Level Four, cooling medium pressure are during more than or equal to 13.5bar, and flow is 100%.
4. air-conditioning unit cooling water discharge Automatic adjustment method according to claim 3 is characterized in that: described level Four discharge control realizes in the following ways: one-level, and the 1st, 2 two-port valves (1,2) cut out, the water flowing of normal open water pipe; Secondary, the 1st two-port valve (1) is opened, and the 2nd two-port valve (2) cuts out, normal open water pipe and the 1st two-port valve (1) water flowing; Three grades, the 1st two-port valve (1) cuts out, and the 2nd two-port valve (2) is opened, normal open water pipe and the 2nd two-port valve (2) water flowing; Level Four, normal open water pipe, the 1st two-port valve (1) are opened with the 2nd two-port valve (2).
5. air-conditioning unit cooling water discharge Automatic adjustment method according to claim 4, it is characterized in that: cooling water inlet one end of described Water cooled air conditioners unit condenser is provided with the hydraulic pressure sensor (5) that detects water inlet pipe hydraulic pressure, hydraulic pressure sensor passes to hydraulic signal the frequency-variable controller of variable frequency pump, frequency-variable controller compares the setting value of hydraulic pressure and actual pressure, the frequency of supply signal of variable frequency pump is regulated in output, change the frequency of supply of variable frequency pump (6), hydraulic pressure is adjusted to setting value.
6. air-conditioning unit cooling water discharge Automatic adjustment method according to claim 5, it is characterized in that: described air-conditioner host adopts air-conditioning unit MDS-W, normal open water pipe bore is 7.92mm, the bore of the 1st pipeline in parallel is 10mm, the bore of the 2nd pipeline in parallel is 12mm, the 1st two-port valve adopts FCV2314G, the 2nd two-port valve adopts FCV2417G, high pressure sensor adopts NSK-BA042D-178, the air conditioner group controller adopts MDS-P/M, hydraulic pressure sensor adopts PTJ204, variable frequency pump MHI 402, and frequency-variable controller adopts CHF100-1R5G-S2.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519520A (en) * | 2011-12-16 | 2012-06-27 | 深圳麦克维尔空调有限公司 | Method for detecting flux of chilled water of water chiller |
| CN103312125A (en) * | 2012-03-07 | 2013-09-18 | 珠海格力电器股份有限公司 | Air conditioner, and cooling system and cooling method of centrifugal unit transducer in air conditioner |
| CN104266276A (en) * | 2014-09-23 | 2015-01-07 | 苏宇贵 | Water-cooled air conditioner and energy-saving control method thereof |
| CN105115098A (en) * | 2015-07-20 | 2015-12-02 | 广东美的暖通设备有限公司 | Method and system for automatically detecting mounting positions of coil temperature sensors of fan coils |
| CN106546020A (en) * | 2016-10-27 | 2017-03-29 | 重庆美的通用制冷设备有限公司 | Air conditioning system |
| CN104595568B (en) * | 2014-12-25 | 2017-11-21 | 珠海格力电器股份有限公司 | The detection method and device of air-conditioning water valve |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05204466A (en) * | 1991-07-05 | 1993-08-13 | Takenaka Komuten Co Ltd | Control method for flow rate control valve |
| JP2001304660A (en) * | 2000-04-25 | 2001-10-31 | Ntt Power & Building Facilities Inc | Air conditioner and its control method |
| CN2762030Y (en) * | 2004-12-17 | 2006-03-01 | 广东美的电器股份有限公司 | Adjusting structure of compression ratio of compressor |
| CN2884017Y (en) * | 2006-04-27 | 2007-03-28 | 代伯清 | Water varable delivery and temp. controller of coiled pipe air conditioner |
| CN200955883Y (en) * | 2006-09-15 | 2007-10-03 | 佛山市确正冷热设备有限公司 | Compressor condensing pressure regulating mechanism |
| CN101691945A (en) * | 2009-09-29 | 2010-04-07 | 艾默生网络能源有限公司 | Condensing pressure control device of air conditioning unit and control method thereof |
-
2010
- 2010-09-10 CN CN 201010281255 patent/CN101957045B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05204466A (en) * | 1991-07-05 | 1993-08-13 | Takenaka Komuten Co Ltd | Control method for flow rate control valve |
| JP2001304660A (en) * | 2000-04-25 | 2001-10-31 | Ntt Power & Building Facilities Inc | Air conditioner and its control method |
| CN2762030Y (en) * | 2004-12-17 | 2006-03-01 | 广东美的电器股份有限公司 | Adjusting structure of compression ratio of compressor |
| CN2884017Y (en) * | 2006-04-27 | 2007-03-28 | 代伯清 | Water varable delivery and temp. controller of coiled pipe air conditioner |
| CN200955883Y (en) * | 2006-09-15 | 2007-10-03 | 佛山市确正冷热设备有限公司 | Compressor condensing pressure regulating mechanism |
| CN101691945A (en) * | 2009-09-29 | 2010-04-07 | 艾默生网络能源有限公司 | Condensing pressure control device of air conditioning unit and control method thereof |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519520A (en) * | 2011-12-16 | 2012-06-27 | 深圳麦克维尔空调有限公司 | Method for detecting flux of chilled water of water chiller |
| CN103312125A (en) * | 2012-03-07 | 2013-09-18 | 珠海格力电器股份有限公司 | Air conditioner, and cooling system and cooling method of centrifugal unit transducer in air conditioner |
| CN103312125B (en) * | 2012-03-07 | 2016-06-08 | 珠海格力电器股份有限公司 | The cooling system of centrifugal unit inverter and method of cooling in conditioner, conditioner |
| CN104266276A (en) * | 2014-09-23 | 2015-01-07 | 苏宇贵 | Water-cooled air conditioner and energy-saving control method thereof |
| CN104266276B (en) * | 2014-09-23 | 2017-10-03 | 苏宇贵 | Water-cooling air conditioner and its energy-saving control method |
| CN104595568B (en) * | 2014-12-25 | 2017-11-21 | 珠海格力电器股份有限公司 | The detection method and device of air-conditioning water valve |
| CN105115098A (en) * | 2015-07-20 | 2015-12-02 | 广东美的暖通设备有限公司 | Method and system for automatically detecting mounting positions of coil temperature sensors of fan coils |
| CN105115098B (en) * | 2015-07-20 | 2018-02-02 | 广东美的暖通设备有限公司 | A kind of method and system of automatic detection fan coil pipe temperature sensor installation site |
| CN106546020A (en) * | 2016-10-27 | 2017-03-29 | 重庆美的通用制冷设备有限公司 | Air conditioning system |
| CN106546020B (en) * | 2016-10-27 | 2018-04-06 | 重庆美的通用制冷设备有限公司 | Air-conditioning system |
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