CN1904503A - Compressor variable frequency energy saving reforming method of constant speed centrifugal water cooling machine set - Google Patents
Compressor variable frequency energy saving reforming method of constant speed centrifugal water cooling machine set Download PDFInfo
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- CN1904503A CN1904503A CN 200610061915 CN200610061915A CN1904503A CN 1904503 A CN1904503 A CN 1904503A CN 200610061915 CN200610061915 CN 200610061915 CN 200610061915 A CN200610061915 A CN 200610061915A CN 1904503 A CN1904503 A CN 1904503A
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Abstract
This invention relates to a kind of constant speed centrifugal water chilling unit compressor conversion energy-saving reforming energy-saving. It collects the refrigeration outer water's temperature; the temperature set value, the refrigeration backwater's temperature, the refrigeration water's flux, the guide vane's jaw opening, the compressor's real rotate speed and parameter of the unit. Through the water chilling unit compressor conversion intelligence fuzzy control system, it optimizes the compressor's rotate speed and the guide vane's jaw opening. This can make the unit always in the best operation even on all kinds of work conditions especially on partly overload condition. At the same time it improves the compressor's efficiency and reduces the cooling unit's energy consumption for work. It saves the energy of central air condition water chilling unit and has economic operation; the result of save energy is above 30% every year.
Description
One, technical field:
The present invention relates to a kind of central air-conditioning compressor variable frequency energy saving reforming method of constant speed centrifugal water cooling machine set, only at central air-conditioning constant speed centrifugal unit, centrifugal compressor to unit carries out variable frequency energy saving reforming, reduce the operate power of compressor, realize the energy-conservation and economical operation of central air-conditioning handpiece Water Chilling Units.
Two, background technology
Because central air-conditioning constant speed centrifugal handpiece Water Chilling Units compressor is not precluded within long playing possibility under the full load state, so can only decide the capacity of compression motor by greatest requirements; In actual motion, the external load of air-conditioning unit is frequent variations often, unit is very high in shared ratio of the time of operation at part load, therefore must carry out the energy adjustment of unit, to guarantee the refrigerating capacity demand when the sub-load, regulate the capacity of unit, reduce the operate power of compressor; At present usual way is by regulating inlet guide vane, changes the kinetic characteristic that direction that gas enters impeller changes compressor, to reach under the immovable situation of compressor rotary speed, regulates the purpose of the capacity of centrifugal refrigerating machines; The capacity regulation method of this unit, when operation at part load, Energy Efficiency Ratio is lower, and compressor operating power is big, can't realize energy-conservation and economical operation.
Three, summary of the invention:
(1) the technical problem to be solved in the present invention
In order to solve existing constant speed centrifugal handpiece Water Chilling Units when the operation at part load, Energy Efficiency Ratio is lower, energy consumption of compressor is excessive, can't realize energy-conservation and problem economical operation, the invention provides a kind of device of constant speed centrifugal handpiece Water Chilling Units compressor variable frequency energy saving reforming, by the handpiece Water Chilling Units compressor is carried out the frequency control transformation, optimize the open degree of regulating inlet guide vane simultaneously, make unit be in optimal operational condition, thereby reduce the operate power of unit when operation at part load, realize energy-conservation and economical operation.
(2) the technical solution adopted in the present invention
The present invention is in order to realize the energy-saving effect of centrifugal refrigerating machines compressor variable frequency energy saving reforming better, gathered the freezing leaving water temperature of unit, desired temperature, freezing return water temperature, chilled-water flow, the guide vane aperture, variable and parameters (referring to accompanying drawing 1) such as compressor actual speed, by handpiece Water Chilling Units compressor variable frequency Intelligent Fuzzy Control system, optimize compressor rotary speed and optimize the guide vane aperture, make unit under various operating modes, especially under the sub-load situation, all the time be in optimal operational condition, improve the efficient of compressor simultaneously, reduce the operation power consumption of refrigeration unit, realize the energy-conservation and economical operation of central air-conditioning handpiece Water Chilling Units.
Refrigerating capacity load after the variable computings such as the temperature difference that basic controlling parameter of the present invention is chilled water leaving water temperature actual value and setting value, real-time sampling chilled-water flow and the temperature difference.When unit moves under 70%～100% refrigeration duty operating mode, the guide vane standard-sized sheet, the electromotor velocity logic enters 1 operation (referring to accompanying drawing 2) of compressor performance curves zone fully by temperature difference control.Decline along with refrigeration duty, when unit moves under 50%～70% refrigeration duty operating mode, motor speed will reduce, till rotating speed reaches minimum, enter 2 operations (referring to accompanying drawing 2) of compressor performance curves zone, at this moment, motor will remain on minimum speed, signal is provided for the guide vane control logic by the Intelligent Fuzzy Control system, makes it reduce the aperture of guide vane.Continuation decline along with refrigeration duty, the Intelligent Fuzzy Control system continues to close guide vane, when unit hour is very much when moving under refrigeration duty drops to less than 50% operating mode in refrigerating capacity, can cause cold-producing medium inspiratory capacity deficiency, refrigerant gas stream can not flow into each runner of impeller equably, thereby impeller can not normal exhaust, causes pressure at expulsion suddenly to descend, compressor is in the unstable operation district, and surge will take place compressor.Take place for fear of surge, when unit moved under less than 50% operating mode in refrigerating capacity, the Intelligent Fuzzy Control system should in time improve the rotating speed of motor, at this moment enters 3 operations (referring to accompanying drawing 2) of compressor performance curves zone.In a word, under any operating mode, handpiece Water Chilling Units compressor variable frequency Intelligent Fuzzy Control system can both be according to the temperature difference and the refrigerating capacity rate of load condensate of cold water leaving water temperature and setting value, optimize the aperture of motor speed and guide vane, thereby satisfy burden requirement, and make the unit performance optimum, most effective, the compressor power savings is the highest.
(3) beneficial effect
1. the compressor variable frequency energy saving reforming device that the present invention relates to can improve the operating efficiency when operation at part load greatly, and the annual energy-saving effect is more than 30%.
2. the compressor variable frequency energy saving reforming device that the present invention relates to has strengthened the relieving capacity of unit, can prevent the generation of Zhichuan shake effectively.
3. the compressor variable frequency energy saving reforming device that the present invention relates to, realized the soft start of unit, avoided electromechanical starter rush of current up to 5 times when starting, owing to there is not rush of current, be particularly suitable for the place of power supply capacity deficiency, as adopting the generator powered system.
4. the compressor variable frequency energy saving reforming device that the present invention relates to, the life-span of equipment such as compressor electric motor obtains useful prolongation, can save maintenance cost comprehensively.
5. the compressor variable frequency energy saving reforming device that the present invention relates to makes the power factor (PF) of compressor electric motor reach 95%, has also improved the noise of machine room, and running environment is quiet.
Four, description of drawings:
Fig. 1: handpiece Water Chilling Units compressor variable frequency Intelligent Fuzzy Control system diagram
Fig. 2: performance of centrifugal compressors curve map
Five, the specific embodiment:
Open sharp 19XR5555457DHS centrifugal refrigerating machines, the refrigerating capacity 2461KW/700 standard ton of this unit, compressor electric motor power 472KW, rated current 817A, evaporator flow 423M
3/ H, condenser flow 508M
3/ H, two of refrigerating water pump 75KW, flow 500M
3/ H, two of refrigerating water pump 55KW, flow 630M
3/ H, water pump 1 usefulness 1 is equipped with mode and moves.
According to unit operation record investigation and analysis over 2 years are learnt, handpiece Water Chilling Units is when load is maximum, chilled water goes out 8 ℃～11.5 ℃ of return water temperatures, 31 ℃～35 ℃ of cooling water Inlet and outlet water temperature, the current loading rate of compressor is 83%, and in the annual most time, the chilled water temperature difference is in 3 ℃, the average current load rate is 60%, unit is under the sub-load situation and moves, though can carry out by regulating inlet guide vane, changes the kinetic characteristic that direction that gas enters impeller changes compressor, to reach under the immovable situation of compressor rotary speed, regulate the purpose of the capacity of centrifugal refrigerating machines; The capacity regulation method of this unit, when operation at part load, Energy Efficiency Ratio is lower, and compressor operating power is big, can't realize energy-conservation and economical operation.
Be example to open sharp 19XR centrifugal refrigerating machines below, adopt the technology of apparatus of the present invention, carry out concrete implementation constant speed centrifugal handpiece Water Chilling Units compressor variable frequency energy saving reforming process, frequency converter is selected the FR-F740-S500K-CHT 500KW of Mitsubishi, rated current 866A for use.When apparatus of the present invention are installed; must after having a power failure, whole unit carry out; the motor lines of the compressor in the former startup cabinet is linked on the UVW terminal of frequency converter; drawing power line from former startup cabinet inserts on the RST terminal of frequency converter; also insert the unit operation control signal simultaneously; stopping signal; alarm signal; last modernization system is the chilled water leaving water temperature of sensor installation collection unit also; freezing return water temperature; freezing circling water flow rate; variablees such as guide vane aperture, and freezing leaving water temperature setting value; the compressor rotary speed signal is then set and gather to parameters such as compressor actual speed from frequency converter by improved control system.
After compressor variable frequency energy saving reforming is finished, unit start mode of operation is with identical originally, after the unit start, handpiece Water Chilling Units compressor variable frequency Intelligent Fuzzy Control system, by having gathered the freezing leaving water temperature of unit, desired temperature, freezing return water temperature, chilled-water flow, the guide vane aperture, variable and parameters such as compressor actual speed, send the instruction of accurate speed command and guide vane opening, regulate compressor rotary speed by frequency converter optimization, come the aperture of optimal control guide vane by executing agency, the operate power of compressor reduces significantly, and the operating efficiency of unit when operation at part load increased substantially.
Below for opening the ruuning situation contrast after the centrifugal 700 standard ton handpiece Water Chilling Units of sharp 19XR have been installed the frequency converting and energy saving device that the present invention relates to.
| Refrigeration duty % | Refrigerating capacity (KW) | Compressor power input (KW) | Power saving rate % | |
| Compressor power frequency constant-speed operation | The compressor variable frequency operation | |||
| 80 | 1970 | 342 | 299 | 12.57 |
| 70 | 1723 | 290 | 228 | 21.38 |
| 60 | 1477 | 248 | 168 | 32.26 |
| 50 | 1230 | 211 | 118 | 44.08 |
| 40 | 984 | 183 | 96 | 47.54 |
| 30 | 738 | 155 | 92 | 40.65 |
Can draw significantly from last table, by constant speed centrifugal handpiece Water Chilling Units compressor is carried out variable frequency energy saving reforming, can increase substantially the operating efficiency when operation at part load, the annual energy-saving effect is more than 30%.
By constant speed centrifugal handpiece Water Chilling Units compressor is carried out variable frequency energy saving reforming, optimize the speed of regulating compressor electric motor, regulate the open degree of guide vane simultaneously, reach best efficient, make unit be in best running status, thereby the operate power when being reduced in sub-load is saved the electricity charge, the investment cost of reducing energy consumption was estimated in the time of 2-3, and is promptly recyclable.
Claims (2)
1. compressor variable frequency energy saving reforming method of constant speed centrifugal water cooling machine set, it is characterized in that: 1. at central air-conditioning constant speed centrifugal unit carry out variable frequency energy saving reforming 2. the basic controlling parameter be the temperature difference of chilled water leaving water temperature actual value and setting value, refrigerating capacity after the variable computings such as the real-time sampling chilled-water flow and temperature difference load is 3. according to the temperature difference and the refrigerating capacity rate of load condensate of cold water leaving water temperature and setting value, optimize the aperture of motor speed and guide vane, under the sub-load situation, all the time be in optimal operational condition, the highest big-power transducer that 4. adopts of compressor power savings and operating efficiency carries out variable frequency energy saving reforming to constant speed centrifugal handpiece Water Chilling Units compressor.
2. the variable according to right 1 described collection is the actual speed of the freezing leaving water temperature of unit, freezing return water temperature, chilled-water flow, guide vane aperture, compressor electric motor, and the parameter of setting is a desired temperature.
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| CN 200610061915 CN1904503A (en) | 2006-08-01 | 2006-08-01 | Compressor variable frequency energy saving reforming method of constant speed centrifugal water cooling machine set |
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| CN 200610061915 CN1904503A (en) | 2006-08-01 | 2006-08-01 | Compressor variable frequency energy saving reforming method of constant speed centrifugal water cooling machine set |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957041A (en) * | 2010-08-23 | 2011-01-26 | 张铭联 | Safe and energy-saving operation method for central air conditioner |
| CN102003377A (en) * | 2010-11-23 | 2011-04-06 | 北京时代科仪新能源科技有限公司 | Control device and method for air compressor |
| CN102575685A (en) * | 2009-10-21 | 2012-07-11 | 开利公司 | Centrifugal compressor part load control algorithm for improved performance |
| CN102741624A (en) * | 2008-02-27 | 2012-10-17 | 三菱重工业株式会社 | Turbo-refrigerator, refrigerating system, and control method thereof |
| CN103017429A (en) * | 2012-07-02 | 2013-04-03 | 中国科学院沈阳自动化研究所 | High-precision fast control method for variable-frequency industrial water chiller |
| CN104864620A (en) * | 2014-02-26 | 2015-08-26 | 荏原冷热***株式会社 | Centrifugal refrigerator |
| CN105444482A (en) * | 2015-12-11 | 2016-03-30 | 重庆美的通用制冷设备有限公司 | Water-cooling water chilling unit and energy-saving operation control method thereof |
| CN106524582A (en) * | 2016-11-24 | 2017-03-22 | 广东美的暖通设备有限公司 | Compressor load control method and device applicable to water side parallel-connected air cooled heat pump units |
| CN106524613A (en) * | 2016-11-14 | 2017-03-22 | 广东美的暖通设备有限公司 | Variable-frequency air-cooled heat pump unit and control method and device thereof |
| CN107270601A (en) * | 2017-07-07 | 2017-10-20 | 青岛海尔空调电子有限公司 | A kind of water chilling unit control method |
| CN107940841A (en) * | 2017-11-22 | 2018-04-20 | 杨可欣 | A kind of refrigeration unit control system |
| WO2019228173A1 (en) * | 2018-06-01 | 2019-12-05 | 羾领节能科技(冷吨保)香港有限公司 | Variable-frequency control system and control method therefor |
| CN111140544A (en) * | 2019-12-18 | 2020-05-12 | 珠海格力电器股份有限公司 | Compressor guide vane opening degree control method and device and air conditioning unit |
| CN112212461A (en) * | 2020-09-10 | 2021-01-12 | 珠海格力电器股份有限公司 | Central air-conditioning system and control method thereof |
| CN115127246A (en) * | 2021-07-09 | 2022-09-30 | 上海氢枫能源技术有限公司 | Water chiller energy-saving system and method controlled by frequency converter |
| CN115451596A (en) * | 2022-08-31 | 2022-12-09 | 克莱门特捷联制冷设备(上海)有限公司 | Energy control method for quickly and stably starting centrifugal water chilling unit |
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2006
- 2006-08-01 CN CN 200610061915 patent/CN1904503A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102741624A (en) * | 2008-02-27 | 2012-10-17 | 三菱重工业株式会社 | Turbo-refrigerator, refrigerating system, and control method thereof |
| CN102741624B (en) * | 2008-02-27 | 2015-09-16 | 三菱重工业株式会社 | Turborefrigerator and refrigeration system and control method thereof |
| CN102575685B (en) * | 2009-10-21 | 2015-08-12 | 开利公司 | For improvement of the centrifugal compressor part load control algorithm of performance |
| CN102575685A (en) * | 2009-10-21 | 2012-07-11 | 开利公司 | Centrifugal compressor part load control algorithm for improved performance |
| US10544801B2 (en) | 2009-10-21 | 2020-01-28 | Carrier Corporation | Centrifugal compressor part load control algorithm for improved performance |
| CN101957041A (en) * | 2010-08-23 | 2011-01-26 | 张铭联 | Safe and energy-saving operation method for central air conditioner |
| CN102003377A (en) * | 2010-11-23 | 2011-04-06 | 北京时代科仪新能源科技有限公司 | Control device and method for air compressor |
| CN103017429A (en) * | 2012-07-02 | 2013-04-03 | 中国科学院沈阳自动化研究所 | High-precision fast control method for variable-frequency industrial water chiller |
| CN103017429B (en) * | 2012-07-02 | 2014-11-26 | 中国科学院沈阳自动化研究所 | High-precision fast control method for variable-frequency industrial water chiller |
| CN104864620A (en) * | 2014-02-26 | 2015-08-26 | 荏原冷热***株式会社 | Centrifugal refrigerator |
| CN104864620B (en) * | 2014-02-26 | 2019-01-01 | 荏原冷热***株式会社 | Centrifugal refrierator |
| CN105444482A (en) * | 2015-12-11 | 2016-03-30 | 重庆美的通用制冷设备有限公司 | Water-cooling water chilling unit and energy-saving operation control method thereof |
| CN106524613A (en) * | 2016-11-14 | 2017-03-22 | 广东美的暖通设备有限公司 | Variable-frequency air-cooled heat pump unit and control method and device thereof |
| CN106524582B (en) * | 2016-11-24 | 2019-04-19 | 广东美的暖通设备有限公司 | Compressor load control method and device suitable for water side parallel connection Air-Cooled Heat Pump Unit |
| CN106524582A (en) * | 2016-11-24 | 2017-03-22 | 广东美的暖通设备有限公司 | Compressor load control method and device applicable to water side parallel-connected air cooled heat pump units |
| CN107270601A (en) * | 2017-07-07 | 2017-10-20 | 青岛海尔空调电子有限公司 | A kind of water chilling unit control method |
| CN107940841A (en) * | 2017-11-22 | 2018-04-20 | 杨可欣 | A kind of refrigeration unit control system |
| WO2019228173A1 (en) * | 2018-06-01 | 2019-12-05 | 羾领节能科技(冷吨保)香港有限公司 | Variable-frequency control system and control method therefor |
| CN112074693A (en) * | 2018-06-01 | 2020-12-11 | 羾领节能科技 (冷吨保)香港有限公司 | Frequency conversion control system and control method thereof |
| CN111140544A (en) * | 2019-12-18 | 2020-05-12 | 珠海格力电器股份有限公司 | Compressor guide vane opening degree control method and device and air conditioning unit |
| CN112212461A (en) * | 2020-09-10 | 2021-01-12 | 珠海格力电器股份有限公司 | Central air-conditioning system and control method thereof |
| CN115127246A (en) * | 2021-07-09 | 2022-09-30 | 上海氢枫能源技术有限公司 | Water chiller energy-saving system and method controlled by frequency converter |
| CN115451596A (en) * | 2022-08-31 | 2022-12-09 | 克莱门特捷联制冷设备(上海)有限公司 | Energy control method for quickly and stably starting centrifugal water chilling unit |
| CN115451596B (en) * | 2022-08-31 | 2024-07-09 | 克莱门特捷联制冷设备(上海)有限公司 | Quick and stable energy control method for starting up centrifugal chiller |
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