CN101403556B - Energy regulation control method of dual-system screw type water chilling unit - Google Patents
Energy regulation control method of dual-system screw type water chilling unit Download PDFInfo
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- CN101403556B CN101403556B CN2008103055335A CN200810305533A CN101403556B CN 101403556 B CN101403556 B CN 101403556B CN 2008103055335 A CN2008103055335 A CN 2008103055335A CN 200810305533 A CN200810305533 A CN 200810305533A CN 101403556 B CN101403556 B CN 101403556B
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Abstract
The invention discloses an energy adjusting and controlling method with low failure rate and saved energy for a double-system screw chiller unit, which comprises a starting stage control and an operation stage control for setting up the control cycle. In the operation stage control, two screw compressors are in a 75 percent or 100 percent operating state or in a standby state. In the operation stage, an energy demand of the double-system screw chiller unit is adjusted according to the difference between the measured temperature and the set temperature. When screw compressors are in a 75 percent or 100 percent operating state, the lubrication is sufficient and the energy efficiency ratio is high so as to solve the failure problems arising from the long operation of single screw compressor in a 25 percent or 50 percent operating state, reduce the working energy consumption, improve the working stability of the double-system screw chiller unit, prolong the service life of the double-system screw chiller unit and reduce the operation and maintenance cost of the double-system screw chiller unit. Though reducing the number of adjusting levels, the energy adjusting and controlling method can still ensure the temperature controlling precision and meet the needs of the users, which is particularly suitable for the double-system screw chiller unit.
Description
Technical field
The present invention relates to a kind of central air-conditioning unit progress control method, especially a kind of energy regulation control method of dual-system screw type water chilling unit.
Background technology
At present, in central air conditioner system, the dual-system screw type handpiece Water Chilling Units that comprises two screw compressors adopts eight grades of energy adjustment to realize adjustment mostly, two screw compressors are respectively No. 1 screw compressor and No. 2 screw compressors, and the separate unit screw compressor has 25%, 50%, 75% and 100% four retaining energy adjustment retainings.In the start-up control stage, load gradually behind the whole unit starting, by 1/8,1/4,3/8,1/2,5/8,3/4,7/8 until operating at full capacity.In the operation control stage,, periodically carry out the energy adjustment of unit according to observed temperature and design temperature.At present only participate in energy adjustment with 25%, 50%, the 75% energy adjustment retaining of a screw compressor wherein, an other screw compressor or operate at full capacity at 100% retaining, or standby participate in regulating.When whole unit moved under 1/8,1/4,5/8,3/4 load, that screw compressor that participates in energy adjustment worked in 25%, 50% retaining of self.
When the separate unit screw compressor worked in 25% retaining of self, because this moment, compression ratio reduced, pressure reduction was little, and oil return is short of power, and the refrigeration oil that offers rotor and bearing is few, and lubricating capacity descends, and the unit fault rate will increase.When the separate unit screw compressor worked in 50% retaining of self, though energy-conservation, compressor efficiency was low, influences the Energy Efficiency Ratio of whole system.
Therefore, existing energy regulation control method of dual-system screw type water chilling unit is unreasonable, thereby above-mentioned fault rate height, defective that energy consumption is high occur.
Summary of the invention
In order to overcome existing energy regulation control method of dual-system screw type water chilling unit fault rate height, deficiency that energy consumption is high, technical problem to be solved by this invention provides the low and energy-conservation energy regulation control method of dual-system screw type water chilling unit of a kind of fault rate.
The technical solution adopted for the present invention to solve the technical problems is: energy regulation control method of dual-system screw type water chilling unit, the operation phase control of control and setting control cycle startup stage of comprising, in the operation phase control, two screw compressors operate in 75%, 100% retaining or the standby of self.
The invention has the beneficial effects as follows: the operation phase guarantees screw compressor or operates in 75%, 100% retaining of self, standby, because it is fully lubricated when 75%, the 100% retaining operation of self, the Energy Efficiency Ratio height, therefore control method of the present invention has solved the separate unit screw compressor and has kept off the problem that long-play is prone to fault in self 25%, 50%, and reduced the work energy consumption, improve the reliability of unit work, and prolonged unit durability, reduced the operation and maintenance cost of unit; The present invention regulates the energy requirement of unit by loading the temperature difference when each control cycle finishes, though reduced adjusting progression, but still can guarantee temperature control precision, can satisfy user's needs.
Description of drawings
The control flow chart startup stage that Fig. 1 being of the present invention.
Fig. 2 is an operation phase energy requirement control flow chart of the present invention.
Fig. 3 is an operation phase energy adjustment control flow chart of the present invention.
A represents the circulation point of operation phase control cycle among the figure.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
As Fig. 1, Fig. 2 and shown in Figure 3, energy regulation control method of dual-system screw type water chilling unit of the present invention, the operation phase control of control and setting control cycle startup stage of comprising, it is characterized in that: in the operation phase control, two screw compressors operate in 75%, 100% retaining or the standby of self.Because it is fully lubricated when 75%, the 100% retaining operation of self, the Energy Efficiency Ratio height, therefore control method of the present invention has solved the separate unit screw compressor and has kept off the problem that long-play is prone to fault in self 25%, 50%, and reduced the work energy consumption, improve the reliability of unit work, and prolonged unit durability, reduced the operation and maintenance cost of unit.
In order to guarantee temperature control precision, satisfy user's needs, the energy requirement of giving tacit consent to unit at the initial point of operation phase control is 100%, when each control cycle finishes, according to loading the temperature difference energy requirement of unit is regulated, loaded the temperature difference=observed temperature design temperature.
Preferably, for observed temperature is adjusted to as early as possible design temperature ± 2 ℃ of scopes in, the system capacity demand adopts following regulative mode: load the temperature difference＞2 ℃ and unit when not reaching at full capacity, system capacity increase in demand 25%; 0 ℃≤when loading the temperature difference≤2 ℃, the system capacity demand remains unchanged; 0 ℃＞when loading the temperature difference 〉=-2 ℃, the system capacity demand reduces 25%; When loading the temperature difference＜-2 ℃, the system capacity demand is 0%.
When the unit energy requirement was 25%, a screw compressor operated in 75% retaining of self, another screw compressor standby.
When the unit energy requirement was 50%, a screw compressor operated in 100% retaining of self, another screw compressor standby.
When the unit energy requirement was 75%, two screw compressors all operated in 75% retaining of self.
When the unit energy requirement was 100%, two screw compressors all operated in 100% retaining of self.
When the unit energy requirement is 0%, two equal standbies of screw compressor.
For the accumulative total working time of two screw compressors of balance, make two screw compressor uniform wears, improve the reliability and the life-span of unit work, also can be in when beginning startup stage control, the accumulated running time of comparing two screw compressors, with accumulated running time short that screw compressor as main frame, when the accumulated running time of two screw compressors equates with No. 1 screw compressor as main frame; Another is as subsidiary engine.
Embodiment
The present invention is applied to dual-system screw type water-cooled unit.
During unit starting, selection running time, that few screw compressor was a main frame, and perhaps No. 1 screw compressor of acquiescence is a main frame when equate to two running times; At the same time or before or and then open cold water pump and chilled water pump; detect two pumps whether flow is arranged; then do not change troubleshooting and shutdown over to; have and then start main frame to starting subsidiary engine at full capacity then to full load; startup stage, controlled end and enters the operation control stage immediately; in this stage; control cycle according to default; when each control cycle finishes; the difference of calculating observed temperature and design temperature promptly loads the temperature difference; according to the energy requirement that loads temperature difference decision unit, system is divided into 0%; 25%; 50%; 75%; 100% Pyatyi energy requirement, again according to the operation gear of the energy requirement of unit decision main and auxiliaries:
When loading the temperature difference＞2 ℃ and system when not reaching the upper limit 100%, load, i.e. energy requirement+25% of unit in the energy requirement of unit=last control cycle.
When 0 ℃≤when loading the temperature difference≤2 ℃, the energy requirement of unit remains unchanged, i.e. the energy requirement of unit in the energy requirement of unit=last control cycle;
When 0 ℃＞when loading the energy requirement of the temperature difference 〉=-2 ℃ and unit ≠ 0%, unloading, the i.e. energy requirement-25% of unit in the energy requirement of unit=last control cycle;
When loading the temperature difference＜-2 ℃, complete discharge, the energy requirement of unit=0%
The energy requirement of unit is 0% o'clock, main frame, the equal standby of subsidiary engine;
The energy requirement of unit is 25% o'clock, and main frame runs on 75% retaining of self, subsidiary engine standby;
The energy requirement of unit is 50% o'clock, and main frame runs on 100% retaining of self, subsidiary engine standby;
The energy requirement of unit is 75% o'clock, and main frame, subsidiary engine all run on 75% retaining of self;
The energy requirement of unit is 100% o'clock, and main frame, subsidiary engine all run on 100% retaining of self.
Claims (9)
1. energy regulation control method of dual-system screw type water chilling unit, the operation phase control of control and setting control cycle startup stage of comprising, it is characterized in that: in the operation phase control, two screw compressors operate in 75%, 100% retaining or the standby of self.
2. energy regulation control method of dual-system screw type water chilling unit as claimed in claim 1, it is characterized in that: the energy requirement of the initial point acquiescence unit of operation phase control is 100%, when each control cycle finishes, according to loading the temperature difference energy requirement of unit is regulated, loaded the temperature difference=observed temperature-design temperature.
3. energy regulation control method of dual-system screw type water chilling unit as claimed in claim 2 is characterized in that: load the temperature difference＞2 ℃ and unit when not reaching at full capacity, system capacity increase in demand 25%; 0 ℃≤when loading the temperature difference≤2 ℃, the system capacity demand remains unchanged; 0 ℃＞when loading the temperature difference 〉=-2 ℃, the system capacity demand reduces 25%; When loading the temperature difference＜-2 ℃, the system capacity demand is 0%.
4. as claim 1,2 or 3 described energy regulation control method of dual-system screw type water chilling unit, it is characterized in that: the unit energy requirement is 25% o'clock, and a screw compressor operates in 75% retaining of self, another screw compressor standby.
5. as claim 1,2 or 3 described energy regulation control method of dual-system screw type water chilling unit, it is characterized in that: the unit energy requirement is 50% o'clock, and a screw compressor operates in 100% retaining of self, another screw compressor standby.
6. as claim 1,2 or 3 described energy regulation control method of dual-system screw type water chilling unit, it is characterized in that: the unit energy requirement is 75% o'clock, and two screw compressors all operate in 75% retaining of self.
7. as claim 1,2 or 3 described energy regulation control method of dual-system screw type water chilling unit, it is characterized in that: the unit energy requirement is 100% o'clock, and two screw compressors all operate in 100% retaining of self.
8. as claim 1,2 or 3 described energy regulation control method of dual-system screw type water chilling unit, it is characterized in that: the unit energy requirement is 0% o'clock, two equal standbies of screw compressor.
9. as claim 1,2 or 3 described energy regulation control method of dual-system screw type water chilling unit, it is characterized in that: in when beginning startup stage control, the accumulated running time of comparing two screw compressors, with accumulated running time short that screw compressor as main frame, when the accumulated running time of two screw compressors equates with No. 1 screw compressor as main frame; Another is as subsidiary engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008103055335A CN101403556B (en) | 2008-11-13 | 2008-11-13 | Energy regulation control method of dual-system screw type water chilling unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008103055335A CN101403556B (en) | 2008-11-13 | 2008-11-13 | Energy regulation control method of dual-system screw type water chilling unit |
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| Publication Number | Publication Date |
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| CN101403556A CN101403556A (en) | 2009-04-08 |
| CN101403556B true CN101403556B (en) | 2011-02-16 |
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| CN2008103055335A Expired - Fee Related CN101403556B (en) | 2008-11-13 | 2008-11-13 | Energy regulation control method of dual-system screw type water chilling unit |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094817A (en) * | 2011-02-15 | 2011-06-15 | 四川长虹空调有限公司 | Infinitely variable control compressor for water chiller and loading control method for infinitely variable control compressor |
| CN104406339B (en) * | 2013-11-12 | 2018-03-06 | 江苏春兰动力制造有限公司 | A kind of single screw compressor continuative energy adjustment control method |
| CN104848620B (en) * | 2015-05-11 | 2018-08-10 | 珠海格力电器股份有限公司 | Screw-type water chiller booting loading control method and system |
| CN106225362B (en) * | 2016-08-02 | 2019-06-14 | 顿汉布什(中国)工业有限公司 | A kind of control method and system of Double-head centrifugal refrigerating machines |
| CN106765867B (en) * | 2016-11-14 | 2018-12-07 | 珠海格力电器股份有限公司 | A kind of air conditioner cold water unit allocation method and system |
| CN114811903B (en) * | 2022-05-23 | 2023-06-20 | 珠海格力电器股份有限公司 | Multi-split system, mode switching control method thereof and multi-split equipment |
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Owner name: SICHUAN CHANGHONG ELECTRIC CO.,LTD. Free format text: FORMER OWNER: SICHUAN CHANGHONG ELECTRIC APPLIANCE CO., LTD. Effective date: 20090703 |
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Effective date of registration: 20090703 Address after: Postcode 35, Mian Xing East Road, Gaoxin District, Sichuan, Mianyang Province, China: 621000 Applicant after: Sichuan Changhong Air-Coditioning Co., Ltd. Address before: Postcode 35, Mian Xing East Road, Gaoxin District, Sichuan, Mianyang Province, China: 621000 Applicant before: Sichuan Changhong Electrical Appliance Co., Ltd. |
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