CN101650056B - Combined cold supply system of cooling towers and water cooling unit and control method thereof - Google Patents

Combined cold supply system of cooling towers and water cooling unit and control method thereof Download PDF

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CN101650056B
CN101650056B CN200910092303XA CN200910092303A CN101650056B CN 101650056 B CN101650056 B CN 101650056B CN 200910092303X A CN200910092303X A CN 200910092303XA CN 200910092303 A CN200910092303 A CN 200910092303A CN 101650056 B CN101650056 B CN 101650056B
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China
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cooling
water
heat exchanger
temperature
chilling units
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CN200910092303XA
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Chinese (zh)
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CN101650056A (en
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敖顺荣
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北京康孚环境控制有限公司
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Abstract

The invention discloses a combined cold supply system of cooling towers and a water cooling unit, comprising a cooling water unit, a heat exchanger, a plurality of cooling towers, a temperature detection device and a control device, wherein the cooling water unit is used for supplying frozen water for an air conditioner end system; the heat exchanger is used for supplying cooling water for the air conditioner end system; the cooling towers are used for selectively supplying the cooling water for the heat exchanger and the cooling water unit; the temperature detection device is at least used for detecting the water outlet temperature of the cooling towers and/or the temperature of the cooling water of the heat exchanger and the demand temperature and the water return temperature of the cooling water of the air conditioner end system; and the control device is used for controlling the cooling water of the cooling towers and simultaneously or individually supplying the cooling water for the heat exchanger and the cooling water unit according to the relationship among all temperatures detected by the temperature detection device. The invention also discloses a control method of the combined cold supply system of the cooling towers and the water cooling unit. A combined cold supply mode of the cooling towers and the water cooling unit is adopted, and therefore, the combined cold supply system has the advantages of higher utilization ratio of the cold supply energy quantity of the cooling towers, longer cold supply time and better energy saving effect.

Description

Cooling tower and handpiece Water Chilling Units associating cold supply system and control method thereof
Technical field
The present invention relates to the cold supply system of building central air conditioner system, specifically, relate to a kind of mode and reach energy-saving and cost-reducing cold supply system by cooling tower and handpiece Water Chilling Units associating cooling, and the control method of cold supply system.
Background technology
The cooling tower cold supply system (claims free cold supply again, free cooling) is a kind of energy-saving and cost-reducing system form of building central air conditioner system refrigeration plant that is used for, be applicable to that air conditioning system for building at transition season with still have the cooling demand winter, can't or be not suitable for adopting the occasion in new air-cooled source again.
Such as, for the modern office building that adopts primary air fan-coil system, the inner region of building often requires the air-conditioning system all-year-around cooling, and in transition season or winter, can't utilize the increasing resh air requirement to carry out free cold supply again when the outdoor air enthalpy is lower than room air design enthalpy.
Again such as, for the whole year indoor refrigeration duty account for leading constant temperature and humidity type industrial building (as cigar mill), because the process equipment quantity of heat production is bigger during ordinary production, still may there be the cooling demand in winter and transition season workshop, adopt the type of cooling that strengthens resh air requirement, may cause the increase of air wetting amount, and relative humidity control accuracy in the workshop is had a negative impact.
To this, adopt cooling tower cooling technology, utilize outdoor natural cooling source by water system, replace the artificial low-temperature receiver of refrigeration plant handpiece Water Chilling Units operation, can play good energy-saving effect.
Operation principle according to cooling tower, cooling tower can be the reason that water temperature reduces: when the water in the tower contacts with air, produce the direct heat transfer (sensible heat exchange) between air and the water on the one hand, on the other hand owing to have the hydrone pressure differential between water surface and the air, the hydrone of water surface is flowed to air, produce Evaporation Phenomenon, take away evaporation latent heat (latent heat exchange).
When cooling tower leaving water temperature and air ' s wet bulb temperature approaching, when the promptly cold width of cloth is very little, the main latent heat exchange during by the water evaporation of water cooling in cooling tower, and the sensible heat exchange capacity of water and air can be ignored.
Cooling tower usually according to summer water temperature and temperature condition carry out design selection, under the design conditions, the temperature drop of cooling tower is Δ t=5 ℃, when flow was constant, winter, the motion energy of hydrone reduced along with the reduction of water and air temperature, the molecular diffusion ability reduces, evaporated quantity of water reduces, and the heat of taking away will reduce to some extent, can not obtain and aestival aspect amount of cooling water together.
Whether the cooling tower cooling directly enters the air conditioning terminal system by cooling water usually is divided into two big classes: direct cold supply system of cooling tower and the indirect cold supply system of cooling tower.Fig. 1 is the direct cold supply system flow chart of typical cooling tower, and Fig. 2 is the indirect cold supply system flow chart of typical cooling tower.
The main feature of the direct cold supply system of cooling tower is: system form is simpler, does not have middle heat transfer process, and therefore available cold water temperature is low than the indirect cold supply system of cooling tower under identical outdoor weather condition; But because the cooling water of cooling tower open system is subject to atmosphere pollution, after entering chilled water system, can cause system's internal corrosion or fouling, thereby shorten system service life, influence the stability of system's operation, so system need adopt special water treatment facilities; In addition, when the direct cold supply system of cooling tower moved, bigger variation took place in the resistance of whole air-conditioner water system, flow, therefore, may have pump performance and pipe resistance, the unmatched phenomenon of cooling-tower circulating water amount.
The main feature of the indirect cold supply system of cooling tower is: cooling water loop and chilled water loop are mutually independent by the heat exchange interchanger, have guaranteed the sanitary condition of chilled water pipeline; Because there is a heat transfer process, compare with the direct cold supply system of cooling tower, if reach same cooling effect, require cooling water temperature lower, generally differ 1~2 ℃; Heat transmission equipment and more pipeline have been increased, the system form relative complex.In the conventional at present Air-conditioning Engineering, for ensureing refrigeration system reliability of operation, the indirect cold supply system of more options cooling tower.
Narrate in the numerous at home and abroad documents and materials of the power-saving technology of cooling tower (directly or indirectly) cold supply system and design, be verified in the numerous at home and abroad engineering practice of its energy-saving effect.
But, to take a broad view of these documents and engineering and use, cooling tower (directly or indirectly) cooling operational mode and conventional handpiece Water Chilling Units cooling operational mode all are used as two kinds of operational modes independent of each other and use separately.During actual motion, two kinds of operational modes are according to the variation of outdoor weather condition and the refrigeration duty changes in demand of air conditioning terminal system, by carrying out switchover operation season.
Such as, for a certain specific building central air conditioner system, when outdoor air wet-bulb temperature is lower than certain value, cooling tower (or heat exchanger secondary side) leaving water temperature is lower than the freezing supply water temperature demand of air conditioning terminal system, this moment, system switched to cooling tower cooling operational mode, otherwise, switch to conventional handpiece Water Chilling Units cooling operational mode.
In addition, the cooling tower cold supply system is when design and actual engineering operation at present, usually ignored of the influence of the heat radiation load of cooling tower to leaving water temperature, especially in the refrigeration plant system that many handpiece Water Chilling Units, water pump and cooling tower are formed, designer or operator reduce the target of water pump and cooling tower fan operation energy consumption sometimes in order to covet, cooling tower cooling operational mode often takes the cooling tower of less number and cooling water pump to put into operation, and cooling tower usually moves under height heat radiation load condition as a result.
According to the inventor to the thermal property research of cooling tower under the cooling operational mode, find: the heat radiation load is low more during the cooling tower operation, and under identical air ' s wet bulb temperature condition, its leaving water temperature is low more, cooling tower the whole year can cooling time also just long more, energy-saving effect is also just good more.
Fig. 3 is the thermal property curve of certain cooling tower under the metered flow operating mode, during different cooling range situation.As can be seen from Figure 3, when outdoor wet-bulb temperature is 26 ℃ (design conditions in summer), according to 5 ℃ of temperature drop requirements, the cooling tower leaving water temperature can reach 28.5 ℃ (the cold width of cloth is 2.5 ℃), and inflow temperature is 33.5 ℃.When outdoor wet-bulb temperature reached 5 ℃, evaporation heat transfer reduced, if flow is constant and still require 5 ℃ of coolings, then the cooling tower leaving water temperature reaches 15 ℃ (the cold width of cloth is 10 ℃), and inflow temperature is 20 ℃, with summer the cold water supply and return water temperature there were significant differences.Simultaneously, corresponding above-mentioned 5 ℃ of same outdoor wet-bulb temperature, when cooling tower is only born 2 ℃ of temperature drops if flow is constant (the heat radiation load reduces 60%), the cooling tower leaving water temperature can reach 10 ℃ (the cold width of cloth is 5 ℃), and inflow temperature is 12 ℃.Therefore, the decline of the heat radiation load of bearing during the cooling tower operation can make cooling tower obtain lower leaving water temperature.
Fig. 4 is China's certain city cooling tower of south thermal characteristics curve under the different heat radiation loads in compression electricity refrigeration system, as can be seen from Figure 4, no matter be handpiece Water Chilling Units cooling operation (chiller on) pattern, still the cooling tower cooling moves (chiller off) pattern, under same air ' s wet bulb temperature, the leaving water temperature that cooling tower half capacity operation operating mode is obtained is starkly lower than the leaving water temperature under the oepration at full load operating mode.If the air conditioning terminal system is 14 ℃ in the cooling demand temperature in transition season or winter, cooling tower required air ' s wet bulb temperature under the oepration at full load operating mode is 5 ℃, and required air ' s wet bulb temperature is 10 ℃ under the half capacity operation operating mode, the all-year-around cooling time phase difference of cooling tower under two kinds of operating conditions in this city 1785 hours (amounting to 74.4 days).
Simultaneously, the inventor is analyzed the refrigeration plant total energy consumption under cooling tower (containing corresponding water pump) the cooling operation of not counting on the same stage, find: the low leaving water temperature that guarantees cooling tower to be obtaining the longer cooling tower cooling time, and total energy-saving effect of refrigeration plant is far superior to reduce the energy-saving effect that cooling tower and cooling water pump operation platform number are brought.
In a word, the cooling tower cold supply system that adopts usually on the present engineering awaits further being improved at aspects such as conceptual design, operation adjustings.
Summary of the invention
The object of the invention is to provide a kind of cooling tower that can further cut down the consumption of energy and handpiece Water Chilling Units associating cold supply system, the present invention also aims to provide the control method of cooling tower and handpiece Water Chilling Units associating cold supply system.
For this reason, the invention provides a kind of cooling tower and handpiece Water Chilling Units associating cold supply system, comprising: handpiece Water Chilling Units is used for providing chilled water to the air conditioning terminal system; Heat exchanger is used for providing cooling water to the air conditioning terminal system; Many cooling towers are used for optionally providing cooling water to heat exchanger and handpiece Water Chilling Units; Temperature-detecting device is used to detect leaving water temperature and/or the cooling water temperature of heat exchanger and the cold water demand temperature and the return water temperature of air conditioning terminal system of many cooling towers at least; And control device, the relation between each temperature that detects according to temperature-detecting device, the cooling water that is used to control many cooling towers is supplied with heat exchanger and handpiece Water Chilling Units simultaneously or is supplied with heat exchanger or handpiece Water Chilling Units individually.
Alternatively, the cooling water temperature that above-mentioned control device provides at heat exchanger is during less than the return water temperature of air conditioning terminal system, and the cooling water that is used to control many cooling towers is feeding cold water unit and heat exchanger simultaneously; The cooling water temperature that provides at heat exchanger is during less than the cold water demand temperature of air conditioning terminal system, and the cooling water that is used to control many cooling towers is supplied with heat exchanger separately.
Alternatively, above-mentioned control device is at the leaving water temperature of many cooling towers during less than return water temperature one predetermined value of air conditioning terminal system, and the cooling water that is used to control many cooling towers is feeding cold water unit and heat exchanger simultaneously; The cooling water temperature that provides at heat exchanger makes the cooling water of many cooling towers offer heat exchanger separately during less than the cold water demand temperature of air conditioning terminal system.
Preferably, above-mentioned heat exchanger is a plate type heat exchanger.
Preferably, above-mentioned many cooling towers provide cooling water by many cooling water pumps, and the primary side loop of plate type heat exchanger links to each other with many cooling water pumps of many cooling towers.
Preferably, the primary side loop of above-mentioned plate type heat exchanger is provided with bypass circulation, and bypass circulation is provided with flow control valve.
Preferably, above-mentioned control device comprises controller and is arranged at control valve on each pipeline.
In addition, the present invention also provides the control method of a kind of cooling tower and handpiece Water Chilling Units associating cold supply system, and cold supply system comprises: handpiece Water Chilling Units is used for providing chilled water to the air conditioning terminal system; Heat exchanger is used for providing cooling water to the air conditioning terminal system; And many cooling towers, being used for optionally providing cooling water to heat exchanger and handpiece Water Chilling Units, control method may further comprise the steps: make many cooling towers provide cooling water under less than the fully loaded operating mode; When the leaving water temperature of many cooling towers is lower than the return water temperature of air conditioning terminal system, make the cooling water of many cooling towers supply with heat exchanger and handpiece Water Chilling Units simultaneously; When the leaving water temperature of many cooling towers is lower than the cold water demand temperature of air conditioning terminal system, make the cooling water of many cooling towers supply with heat exchanger separately.
Preferably, when the leaving water temperature of many cooling towers is lower than 2 ℃ of the return water temperatures of air conditioning terminal system, make the cooling water of many cooling towers supply with heat exchanger and handpiece Water Chilling Units simultaneously.
Preferably, when the flow of the cooling water of the supply heat exchanger of many cooling towers during, make unnecessary cooling water directly flow back to many cooling towers greater than the required flow of heat exchanger.
Compare with cooling tower (directly or indirectly) cold supply system of present routine, the present invention adopts cooling tower and handpiece Water Chilling Units associating cooling mode, and the capacity usage ratio with cooling tower cooling is higher, the cooling time is longer, the better advantage of energy-saving effect.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage.Below with reference to figure, other purpose, feature and effect of the present invention is described in further detail.
Description of drawings
Constitute this specification a part, be used for further understanding accompanying drawing of the present invention and show the preferred embodiments of the present invention, and be used for illustrating principle of the present invention with specification.Among the figure:
Fig. 1 is the direct cold supply system flow chart of typical cooling tower;
Fig. 2 is the indirect cold supply system flow chart of typical cooling tower;
Fig. 3 be under the metered flow cooling tower at the thermal characteristics curve of different cooling range operating modes;
Fig. 4 presses down the cooling tower leaving water temperature of compression type refrigerating system and the corresponding relation figure of wet-bulb temperature at different load;
Fig. 5 is the structural representation according to cooling tower of the present invention and handpiece Water Chilling Units associating cold supply system; And
Fig. 6 is the block diagram according to cooling tower of the present invention and handpiece Water Chilling Units associating cold supply system.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.Identical in the accompanying drawings parts are represented with identical label.
Entreat in force in the process of refrigeration plant system of air-conditioning system, the inventor finds: as long as when cooling tower (or heat exchanger secondary side) leaving water temperature is lower than the freezing return water temperature of air conditioning terminal system, the cold water that cooling tower provides can begin to share the refrigeration duty demand of air conditioning terminal system, with the operating load of minimizing refrigeration plant handpiece Water Chilling Units, thereby reach energy-saving effect.This point, be present two kinds of pattern switchover operation schemes independently of one another can't realize.
Fig. 5 is the flow chart according to cooling tower of the present invention and handpiece Water Chilling Units associating cold supply system.As shown in Figure 5, in this preferred embodiment, show the cold supply system that 3 handpiece Water Chilling Units are formed, in other embodiments, cold supply system can have the handpiece Water Chilling Units of other number.Handpiece Water Chilling Units can be the compression electric refrigerating machine, also can be lithium-bromide absorption-type refrigerating machine.
In this preferred embodiment, cooling tower and handpiece Water Chilling Units associating cold supply system is on the basis of conventional refrigeration plant system, sets up plate type heat exchanger 1, plate type heat exchanger primary side loop 2, plate exchanger secondary side loop 3, plate type heat exchanger primary side bypass circulation 4, handpiece Water Chilling Units cooling water bypass circulation 5,6 and 7, handpiece Water Chilling Units chilled water bypass circulation 8 and 9, and changes temperature sensor 11,12,13,14,15 and 16 on butterfly valve 10 (or adopting three-way control valve), each water circuit system corresponding season.
Establish electric control valve 17 on the plate type heat exchanger primary side bypass circulation 4.The primary side loop 2 of plate type heat exchanger 1, plate exchanger secondary side loop 3 cross with cooling water house steward, chilled water house steward respectively, and before crossing check-valves 18 are set separately.
The water bypass pipe road 5,6,7 of handpiece Water Chilling Units and place, the cooling water inlet of handpiece Water Chilling Units are provided with and change butterfly valve (or three-way control valve) 10 season, when certain handpiece Water Chilling Units is out of service, its recirculated cooling water after season, switching valve switched, the primary side of the heat exchanger of flowing through.
The chilled water bypass line 8,9 of handpiece Water Chilling Units and the chilled water inlet place of handpiece Water Chilling Units are provided with and change butterfly valve (or three-way control valve) 10 season.After cooling tower cooling operational mode starts, the chilled water that matches after season, switching valve switched, the secondary side of the plate type heat exchanger of flowing through.
During many cooling tower coolings, unnecessary recirculated cooling water flows back to cooling tower through the bypass line 4 of heat exchanger primary side, and the aperture that bypass flow is regulated by heat exchanger primary side traffic demand (or leaving water temperature) control bypass electric control valve 17 realizes.
The freezing water main of heat exchanger secondary side outlet pipeline and handpiece Water Chilling Units is provided with check-valves 18 separately before crossing, same, the cooling water house steward of heat exchanger primary side outlet pipeline and handpiece Water Chilling Units is provided with check-valves 18 separately before crossing, so can prevent backflow.
Temperature sensor 11 is used to monitor the leaving water temperature of cooling tower, temperature sensor 12 is used to monitor the leaving water temperature of plate type heat exchanger 1 secondary side, temperature sensor 13 is used to monitor the cold water demand temperature of air conditioning terminal system, temperature sensor 14 is used to monitor the freezing return water temperature of air conditioning terminal system, the temperature that temperature sensor 15 is used to monitor the freezing water main of handpiece Water Chilling Units, and temperature sensor 16 is used to monitor the leaving water temperature of plate type heat exchanger 1 primary side.
In this preferred embodiment, adopted plate type heat exchanger 1, in other embodiments, also can be the heat exchanger of other types.Heat exchanger is when design selection, and its heat exchange amount designs by cold season air conditioning terminal refrigeration duty demand, typical case be refrigeration plant always equip cold about 30%.Heat exchanger primary side and condenser, heat exchanger secondary side and evaporimeter should mate design aspect resistance, the flow.Flow, the pressure drop of heat exchanger primary side and its by-pass line (containing electric control valve) should be mated design.
In this preferred embodiment, according to the thermal characteristics of cooling tower under the different load rate, primary side at heat exchanger is provided with bypass line and electric control valve, and the cooling water, chilled water bypass circulation of many handpiece Water Chilling Units is set and changes butterfly valve (or three-way control valve) corresponding season, cooling tower with convenient more numbers can drop into the cooling mode operation, guarantee that every cooling tower moves under than underload rate operating mode, thereby obtain lower cooling tower leaving water temperature and longer cooling tower all-year-around cooling time.
Fig. 6 is the block diagram according to cooling tower of the present invention and handpiece Water Chilling Units associating cold supply system.In conjunction with reference to Fig. 5 and Fig. 6, control device is used for the cooling pattern of control system according to the testing result of temperature-detecting device.
Wherein, temperature-detecting device comprises the temperature sensor 11 of the leaving water temperature that is used to monitor cooling tower at least, be used to monitor the temperature sensor 12 of the leaving water temperature of plate type heat exchanger 1 secondary side, be used to monitor the temperature sensor 13 of the cold water demand temperature of air conditioning terminal system, and the temperature sensor 14 that is used to monitor the return water temperature of air conditioning terminal system.
Wherein, control device comprises controller and a plurality of control valve.These control valves be plate type heat exchanger primary side loop 2, plate exchanger secondary side loop 3, plate type heat exchanger primary side bypass circulation 4, handpiece Water Chilling Units cooling water bypass circulation 5,6 and 7 and handpiece Water Chilling Units chilled water bypass circulation change butterfly valve 10 (or adopting three-way control valve) 8 and 9 pairing seasons.
Wherein, the selectable modes of function system of the present invention has: the cooling water of many cooling towers offers plate type heat exchanger and handpiece Water Chilling Units simultaneously, to realize the cooling pattern of cooling tower and handpiece Water Chilling Units associating cooling; The cooling water of many cooling towers offers plate type heat exchanger separately, to realize cooling tower cooling pattern; Many cooling towers shut down, handpiece Water Chilling Units cooling pattern.
The control procedure of cooling tower of the present invention and handpiece Water Chilling Units associating cold-supplying energy-saving system is as follows:
When system moves, according to the leaving water temperature t of cooling tower 1(recording) and the return water temperature t of air conditioning terminal system by temperature sensor 11 3(being recorded by temperature sensor 14) compares, as cooling tower leaving water temperature t 1When being lower than certain value, the leaving water temperature t of plate type heat exchanger 1 secondary side 4(being recorded by temperature sensor 12) beginning is less than the return water temperature t of air conditioning terminal system 3, this moment, the cooling tower cooling began to put into operation, and provided low-temperature receiver with handpiece Water Chilling Units associating (jointly) for the air conditioning terminal system, and wherein cooling tower is G for the air conditioning terminal system provides the flow of low-temperature receiver through plate type heat exchanger 1 indirectly 1(m 3/ h), handpiece Water Chilling Units is G for the air conditioning terminal system provides the flow of low-temperature receiver 2(m 3/ h).
Leaving water temperature t when plate type heat exchanger 1 secondary side 4Be lower than the demand temperature t of air conditioning terminal system 2When (being recorded by temperature sensor 13), handpiece Water Chilling Units stops the fortune machine, all by the cooling tower cooling.
When certain handpiece Water Chilling Units is out of service, its recirculated cooling water after season, switching valve 10 switched, the primary side of the plate type heat exchanger 1 of flowing through.During many cooling tower coolings, unnecessary recirculated cooling water flows back to cooling tower through the bypass line 4 of plate type heat exchanger 1 primary side, and the aperture that bypass flow is regulated the leaving water temperature control bypass electric control valve 17 that the temperature sensor 16 by plate type heat exchanger 1 primary side records realizes.
The leaving water temperature t of cooling tower 1Leaving water temperature t with plate type heat exchanger 1 secondary side 4Corresponding relation depend on the type selecting of plate type heat exchanger 1, can be similar on the engineering and think t 4=t 1+ (1~2 ℃).Preferably, when system moves, work as t 1<t 3-2 (℃) time, can start cooling tower and handpiece Water Chilling Units associating cooling operational mode.
Compare with cooling tower (directly or indirectly) cold supply system of present routine, the present invention adopts cooling tower and handpiece Water Chilling Units associating cooling mode, and the capacity usage ratio with cooling tower cooling is higher, the better advantage of energy-saving effect.
The present invention establishes bypass line and bypass regulator valve at the primary side of plate type heat exchanger, and cooling water, chilled water bypass circulation and the corresponding switching valve in season of many handpiece Water Chilling Units be set, can realize that every cooling tower moves under running on the lower load, to obtain lower cooling tower leaving water temperature and longer cooling tower cooling time.
In addition, it is simple that the present invention has system architecture, and the resistance in cooling water, chilled water system loop, flow can not have greatly changed under different cooling patterns, so system's stable and reliable operation.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. cooling tower and handpiece Water Chilling Units associating cold supply system is characterized in that, comprising:
Handpiece Water Chilling Units is used for providing chilled water to the air conditioning terminal system;
Heat exchanger is used for providing cooling water to described air conditioning terminal system;
Many cooling towers are used for optionally providing cooling water to described heat exchanger and described handpiece Water Chilling Units;
Temperature-detecting device is used to detect cold water demand temperature and the leaving water temperature of return water temperature and described many cooling towers and the cooling water temperature of described heat exchanger of described air conditioning terminal system at least; And
Control device, according to the relation between detected each temperature of described temperature-detecting device, control the cooling water of described many cooling towers and supply with described heat exchanger and described handpiece Water Chilling Units simultaneously, perhaps supply with described heat exchanger or described handpiece Water Chilling Units individually, wherein, the cooling water temperature that provides at described heat exchanger is during less than the return water temperature of described air conditioning terminal system, perhaps at the leaving water temperature of described many cooling towers during less than return water temperature one predetermined value of described air conditioning terminal system, described control device is used to control the cooling water of described many cooling towers and supplies with described handpiece Water Chilling Units and heat exchanger simultaneously.
2. cooling tower according to claim 1 and handpiece Water Chilling Units associating cold supply system is characterized in that,
The cooling water temperature that described control device provides at described heat exchanger is during less than the cold water demand temperature of described air conditioning terminal system, and the cooling water that is used to control described many cooling towers is supplied with described heat exchanger separately.
3. cooling tower according to claim 1 and handpiece Water Chilling Units associating cold supply system is characterized in that,
Described heat exchanger is a plate type heat exchanger, and described many cooling towers provide cooling water by many cooling water pumps, and the primary side loop of described plate type heat exchanger links to each other with many cooling water pumps of described many cooling towers.
4. cooling tower according to claim 1 and handpiece Water Chilling Units associating cold supply system is characterized in that,
Described control device comprises and is arranged at the control valve on each pipeline and controls each described control valve control of turning device.
5. according to each described cooling tower and handpiece Water Chilling Units associating cold supply system in the claim 1 to 4, it is characterized in that,
The primary side loop of described heat exchanger is provided with bypass circulation, and described bypass circulation is provided with flow control valve.
6. the control method of cooling tower and handpiece Water Chilling Units associating cold supply system, described cold supply system comprises:
Handpiece Water Chilling Units is used for providing chilled water to the air conditioning terminal system;
Heat exchanger is used for providing cooling water to described air conditioning terminal system; And
Many cooling towers are used for optionally providing cooling water to described heat exchanger and described handpiece Water Chilling Units, it is characterized in that described control method may further comprise the steps:
Make described many cooling towers under less than the fully loaded operating mode, provide cooling water;
When the leaving water temperature of described many cooling towers is lower than the return water temperature of described air conditioning terminal system, make the cooling water of described many cooling towers supply with described heat exchanger and described handpiece Water Chilling Units simultaneously;
When the leaving water temperature of described many cooling towers is lower than the cold water demand temperature of described air conditioning terminal system, make the cooling water of many cooling towers supply with described heat exchanger separately.
7. the control method of cooling tower according to claim 6 and handpiece Water Chilling Units associating cold supply system is characterized in that,
When the leaving water temperature of described many cooling towers is lower than 2 ℃ of the return water temperatures of described air conditioning terminal system, make the cooling water of described many cooling towers supply with described heat exchanger and described handpiece Water Chilling Units simultaneously.
8. the control method of cooling tower according to claim 6 and handpiece Water Chilling Units associating cold supply system is characterized in that, also comprises:
Load by reducing described many cooling towers is with the step of the leaving water temperature that reduces described many cooling towers.
9. the control method of cooling tower according to claim 6 and handpiece Water Chilling Units associating cold supply system is characterized in that, also comprises:
When the flow of the cooling water of the described heat exchanger of supply of many cooling towers during, make unnecessary cooling water directly be back to the step of described many cooling towers greater than the required flow of described heat exchanger.
CN200910092303XA 2009-09-09 2009-09-09 Combined cold supply system of cooling towers and water cooling unit and control method thereof CN101650056B (en)

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CN106482573B (en) * 2016-12-05 2018-08-17 上海大众祥源动力供应有限公司 A kind of blower fan of cooling tower Optimal Control System and method
CN108592331B (en) * 2018-05-10 2020-06-02 深圳达实智能股份有限公司 Cooling tower cold supply mode control method and system of air conditioning system
CN109798717B (en) * 2019-01-25 2020-12-29 东南大学 Cooling system for realizing high-precision temperature control and control method thereof
CN110595013A (en) * 2019-10-23 2019-12-20 李立华 Air conditioner refrigeration method and system for data center and data center
CN110940014A (en) * 2019-12-19 2020-03-31 珠海格力电器股份有限公司 Energy-saving air conditioner water system

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