CN100443814C - System of adjusting quantity of cold, and adjustment method for central cooling in region - Google Patents
System of adjusting quantity of cold, and adjustment method for central cooling in region Download PDFInfo
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- CN100443814C CN100443814C CNB2006100368682A CN200610036868A CN100443814C CN 100443814 C CN100443814 C CN 100443814C CN B2006100368682 A CNB2006100368682 A CN B2006100368682A CN 200610036868 A CN200610036868 A CN 200610036868A CN 100443814 C CN100443814 C CN 100443814C
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Abstract
A cold regulation device in cold supplying system of local centralized type is prepared as connecting server of refrigerating station (SRS) to controller of refrigerating station (CRS) and controller of secondary cold exchanging station (CSCES) through converter, connecting multiple remote monitor computer to CRS and multiple CSCES through converter, connecting each CSCES to local monitor computer and multiple tail end controllers separately through industrial control network, carrying out cold regulation on tail device of central air-conditioning and on secondary cold exchanging station, carrying out water temperature regulation on local centralizing cold supplying network.
Description
Technical field
The present invention relates to the central air-conditioning energy control technology, specifically be meant the control method of regional central cooling cold regulating system.
Background technology
The zone central cooling is owing to have the energy use efficiency raising, and environmental thermal pollution is low, can effectively reduce advantages such as place capacity and minimizing machine room floor space, just worldwide promotes the use of fast, has become the importance of modern air conditioning development.But regional central cooling has also brought following technical barrier:
(1) the refrigeration system Energy Efficiency Ratio reduces: routine building design of HVAC supply and return water temperature is 7 ℃/12 ℃, because district cooling secondary cold switching station plate type heat exchanger heat transfer characteristic has determined the pipe network return water temperature to be lower than the building air conditioning return water temperature, in order to improve pipe network chilled water transfer efficiency, reduce the investment of district cooling pipe network, present regional central cooling generally adopts and reduces pipe network water supply temperature (being generally 2～3 ℃), realizes that the big temperature difference (being generally about 10 ℃), low discharge low temperature supply water.In running, realize the big temperature difference, low discharge process design parameter in order to guarantee pipe network, secondary cold switching station cooling amount is regulated and is adopted following dual mode: 1. constant difference control, serve as the control target promptly, satisfy the variation of user's refrigeration duty by regulating plate type heat exchanger primary side (pipe network side) water supply flow with the constant temperature difference.2. permanent supply water temperature control serves as the control target with the constant supply water temperature of user side promptly, realizes that by regulating plate type heat exchanger primary side (pipe network side) water supply flow the user side supply water temperature is constant.These two kinds of control modes can make that all the freezing supply water temperature of pipe network is low excessively, cause refrigeration station refrigeration host computer decrease in efficiency (under the constant prerequisite of refrigerating capacity, 1 ℃ of the every reduction of the electricity freezing leaving water temperature of refrigeration host computer, the main frame energy consumption increases by 2%～3%), producing the required energy consumption of identical cold increases.(regional cold supply system that adopts ice storage technology is in ice-making process, and refrigeration machine efficient is especially well below refrigerating state), so low temperature water supply has brought the problem of refrigeration system Energy Efficiency Ratio reduction;
(2) energy consumption of cooling water pump is big: because district cooling distance, resistance of pipe system are big, cooling pump power and lift are far longer than conventional central air-conditioning water supply pump, how effectively reducing discharge, reduce the water pump power consumption, is to improve one of key issue that district cooling efficient need solve;
(3) the outdoor pipe network loss of refrigeration capacity of district cooling is big: because regional central cooling pipe network distance reaches several kilometers to tens of kilometers, low temperature water supply line and peripheral medium excessive temperature differentials can cause loss of refrigeration capacity to increase.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the control method of regional central cooling cold regulating system is provided, it can increase substantially cooling pipe network water supply temperature, improve the refrigeration host computer operational efficiency, and can improve cooling pipe network supply backwater temperature difference to a certain extent, reduce the consumption of cooling pump power, reduce cooling pipeline loss of refrigeration capacity.
Purpose of the present invention is achieved through the following technical solutions: one's respective area central cooling cold regulating system, comprise the refrigeration station server, the refrigeration station controller, secondary cold switching station controller, terminal controller, the remote monitoring computer, the local monitor computer, described refrigeration station server is connected with refrigeration station controller and secondary cold switching station controller by converter, a plurality of remote monitoring computers are connected with refrigeration station controller and a plurality of secondary cold switching station controller by converter, and each secondary cold switching station controller is connected respectively with local monitor computer and a plurality of terminal controller by industrial control network.
Must realize the present invention for better, described refrigeration station controller is connected with analog quantity input module, analog output module, digital quantity input module, digital quantity output module; Analog quantity input module and refrigeration host computer, cold water frequency conversion water circulating pump, ice-storage system frequency conversion water circulating pump, refrigeration host computer leaving water temperature sensor, refrigeration host computer water flow meter, ice-storage system leaving water temperature sensor, ice-storage system water flow meter, refrigeration station heat-exchangers of the plate type primary side supply water temperature sensor, refrigeration station heat-exchangers of the plate type primary side return water temperature sensor, zone central cooling pipe network water supply temperature sensor, zone central cooling pipe network return water temperature sensor, zone central cooling pipe network frequency conversion periodical feeding pump, zone central cooling pipe network water supply flowmeter, zone central cooling pipe network connects respectively for the backwater differential pressure pickup; Described analog output module, digital quantity input module, digital quantity output module are connected with refrigeration host computer, cold water frequency conversion water circulating pump, ice-storage system frequency conversion water circulating pump, regional central cooling pipe network frequency conversion periodical feeding pump respectively.
Described secondary cold switching station controller and secondary cold switching station heat-exchangers of the plate type primary side supply water temperature sensor, secondary cold switching station heat-exchangers of the plate type primary side return water temperature sensor, building cooling pipe network water supply temperature sensor, building cooling pipe network return water temperature sensor, secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve, secondary cold switching station heat-exchangers of the plate type primary side water supply flow meter, building cooling pipe network frequency conversion water circulating pump, building cooling pipe network connects respectively for the backwater differential pressure pickup.
Described terminal controller is connected respectively with terminal air-conditioning equipment, terminal air-conditioning equipment water supply flow control valve, ambient temperature and humidity sensor.
Described terminal air-conditioning equipment comprises floor air conditioner, fan coil, new blower fan; The measured zone of described ambient temperature and humidity sensor comprises indoor and the fresh wind tube road.
The control method of one's respective area central cooling cold regulating system, adopt three grades of reverse regulative modes of regional central cooling, comprise that the terminal air-conditioning equipment cold of central air-conditioning is regulated, regional central cooling secondary cold switching station cold is regulated, regional central cooling pipe network water supply adjustment, wherein:
(1) the terminal air-conditioning equipment cold of described central air-conditioning is regulated, be meant according to terminal air-conditioning equipment cold computing formula: Q=Cp*q* Δ T, wherein Q is a refrigeration duty, Cp is that specific heat of water holds, Δ T is the supply backwater temperature difference of terminal air-conditioning equipment, constant by keeping terminal air-conditioning equipment water supply flow q, satisfy setting range T≤Tmax with refrigerated area temperature, humidity, RH≤RHmax is the control target, building cooling pipe network water supply temperature is regulated, thereby Δ T is changed, realize the terminal air-conditioning equipment cold adjusting of central air-conditioning, its step comprises:
(1) by terminal controller terminal air-conditioning equipment water supply flow control valve is opened to 100%;
(2) regulate secondary cold switching station heat-exchangers of the plate type primary side water supply control valve opening by the analog output module of secondary cold switching station controller, secondary cold switching station heat-exchangers of the plate type primary side water supply flow count value is changed, thereby building cooling pipe network water supply temperature and terminal air-conditioning equipment supply backwater temperature difference Δ T are changed, realize terminal air-conditioning equipment cold is regulated.
(2) described regional central cooling secondary cold switching station cold is regulated, and its step comprises:
(1) searches temperature, humidity point automatically for the terminal air-conditioning equipment of least favorable operating point and carry out cold and regulate: when the secondary cold switching station that adopts regional central cooling is started working, the building refrigeration duty be a maximum, and the analog output module by secondary cold switching station controller is adjusted to 100% with secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening; Start the terminal air-conditioning equipment that needs refrigeration by terminal controller, and terminal air-conditioning equipment water supply flow control valve is opened to 100%, realize fast-refrigerating;
When all temperature that needs the ambient temperature and humidity sensor of refrigerated area to record, it is T≤Tmax that humidity reaches setting range, behind RH≤RHmax, because indoor refrigeration duty reduces, indoor temperature, humidity begins to descend, this moment, secondary cold switching station controller reduced secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening by analog output module, secondary cold switching station heat-exchangers of the plate type primary side water supply flow is reduced, thereby improve building cooling pipe network water supply temperature, first environment temperature appears in building, the moisture measurement value exceed the setting value upper limit (when T＞Tmax or RH＞RHmax), this temperature, the humidity point is current least favorable operating point;
Continue keep this least favorable operating point terminal air-conditioning equipment water supply flow control valve opening maximum by terminal controller this moment, simultaneously, so that this least favorable operating point T≤Tmax, RH≤RHmax is the control target, regulate secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening by secondary cold switching station controller, secondary cold switching station heat-exchangers of the plate type primary side water supply flow is changed, thereby the supply backwater temperature difference Δ T value of building cooling pipe network water supply temperature and terminal air-conditioning equipment is changed, realize this least favorable operating point environment temperature, the automatic adjusting of the corresponding refrigeration duty in the control of humidity and this least favorable operating point; The building cooling pipe network water supply temperature value that obtain this moment is that Tg is the current building cooling of this building secondary cold switching station pipe network water supply control target temperature value; At this moment, then pass through to regulate terminal air-conditioning equipment water supply control valve opening, regulate terminal air-conditioning equipment water supply flow and realize by terminal controller for the adjusting of non-least favorable operating point environment temperature, humidity;
(2) dynamic adjustments of the dynamic identification of least favorable operating point and building cooling pipe network water supply temperature value Tg: because the variation of building interior refrigeration duty, the least favorable operating point is not constant, the refrigerated area environment temperature that occurs second terminal air-conditioning equipment correspondence when cold supply system, humidity is higher than setting value (T＞Tmax or RH＞RHmax), and recording this end air-conditioning equipment water supply flow control valve opening by terminal controller is 100%, when this end air-conditioning equipment is in the refrigerating operaton state always, then should temperature, the humidity point becomes new current least favorable operating point, and build cooling pipe network water supply temperature and regulate control by new least favorable operating point according to regional central cooling secondary cold switching station cold regulating step (1) this moment;
(3) adjusting of environment temperature when the RH=RHmax of least favorable operating point: by regulating terminal air-conditioning equipment water supply flow control valve opening, regulate terminal air-conditioning equipment water supply flow and realize by terminal controller.
(3) described regional central cooling pipe network water supply adjustment, its step comprises:
(1) searches the least favorable operating point secondary cold switching station of the minimum and secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening maximum of Tg automatically: at all secondary cold switching station performing steps (one), (2) afterwards, the refrigeration station server is gathered building cooling pipe network water supply temperature value Tg in all secondary cold switching station controllers by converter, secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening value K, and all Tg and K are compared, obtain Tg minimum of a value Tg-min and K maximum Kmax, the secondary cold switching station that the secondary cold switching station of Tg-min and Kmax correspondence is the least favorable operating point (under normal circumstances, because Tg is more little, the q demand is big more, K is big more, and Tg-min and Kmax appear at same secondary cold switching station);
(2) refrigeration station cooling leaving water temperature is regulated: the refrigeration station server sends to the refrigeration station controller by converter with Tg-min and Kmax value, the refrigeration station controller is the control target with Tg-min, so that Kmax≤90% (all the other 10% cold adjusting surpluses as the reservation of secondary cold switching station) is a constraints, regulate refrigeration host computer leaving water temperature set-point by analog output module, or the frequency of regulating ice-storage system frequency conversion water circulating pump is given to regulate frozen water Flow-rate adjustment district cooling pipe network water supply temperature value, realizes the servo-actuated control to Tg-min;
(3) the refrigeration station cooling is minimum determines and the water supply flow adjusting for backwater pressure differential deltap Pmin: the refrigeration station server sends secondary cold switching station heat-exchangers of the plate type primary side water supply control valve by converter to all secondary cold switching station controllers and is opened into 100% imperative instruction, and read all secondary cold switching station heat-exchangers of the plate type primary side water supply control valve opening values, after all secondary cold switching station heat-exchangers of the plate type primary side water supply control valves are opened into 100%, read secondary cold switching station heat-exchangers of the plate type primary side water supply flow q value again and send the instruction of pipe network Flow-rate adjustment to the refrigeration station controller, the refrigeration station controller is by analog output module and digital quantity output module control band cooling variable frequency water supply pump frequency and platform number, make all secondary cold switching station heat-exchangers of the plate type primary side water supply flow q values reach design discharge, the refrigeration station cooling that this moment, the refrigeration station controller recorded is minimum for backwater pressure differential deltap Pmin for backwater pressure differential deltap P, after obtaining Δ Pmin, the refrigeration station server sends secondary cold switching station heat-exchangers of the plate type primary side water supply control valve by converter to all secondary cold switching station controllers and is opened into 100% releasing instruction, the refrigeration station controller serves as for backwater pressure differential resetting value with Δ Pmin, by analog output module and digital quantity output module control band cooling variable frequency water supply pump frequency and platform number, it is constant that Δ Pmin is kept, and realizes the adjusting to the district cooling flow;
(4) the dynamic identification of least favorable secondary cold switching station: the refrigeration station server is constantly gathered building cooling pipe network water supply temperature value Tg in all secondary cold switching station controllers by converter, secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening value K, and all Tg and K are compared, obtain current Tg minimum of a value Tg-min and K maximum Kmax, the secondary cold switching station of Tg-min and Kmax correspondence is the secondary cold switching station of current least favorable operating point, and this moment, refrigeration station regulated by the thermoregulator step of above-mentioned zone central cooling pipe network water supply (2).
The present invention compared with prior art has following advantage and beneficial effect:
(1) reduces discharge, reduce pump energy consumption: adopt above-mentioned central air-conditioning end-equipment cold control method and regional central cooling secondary cold switching station cold control method, can effectively improve building cooling pipe network water supply temperature and return water temperature, district cooling pipe network supply backwater temperature difference is increased, and cooling discharge reduces.Under the temperature-resistant prerequisite of central cooling pipe network water supply, the pipe network return water temperature can be improved more than 30%, the water supply pump flow is reduced more than 30%, supply-water pump is energy-conservation more than 30%;
(2) reduce the main frame energy consumption, improve refrigeration host computer efficient: adopt above-mentioned zone central cooling pipe network water supply temperature control method, guaranteeing under the constant prerequisite of central cooling primary side pipe network supply backwater temperature difference, the water supply and the return water temperature of cooling pipe network can be improved 3～6 ℃, make refrigeration station refrigeration host computer efficient improve about 6%～18%;
(3) reduce the outdoor pipe network loss of refrigeration capacity of district cooling: because the raising of supply and return water temperature can reduce the loss of refrigeration capacity 10%～30% in the chilled water course of conveying.
(4) under dry climatic condition, because building cooling pipe network water supply temperature improves, can effectively reduce indoor moisture loss, avoid ambient humidity low excessively, improve environmental degree of comfort, reduce the consumption of air-conditioning system latent heat load cold simultaneously.
(5) reduce regional central cooling system cold unit price cost, reduce user's air-conditioning expense expenditure.
Description of drawings
Fig. 1 is regional central cooling system structure principle chart;
Fig. 2 is a refrigeration station cold supply system structure principle chart;
Fig. 3 is building central air-conditioning system utilizing system architecture schematic diagram;
Fig. 4 is that central air-conditioning end-equipment cold is regulated fundamental diagram;
Fig. 5 is the present invention zone central cooling cold regulating system structure principle chart;
Fig. 6 is a refrigeration station shown in Figure 5 controller architecture schematic diagram;
Fig. 7 is a secondary cold switching station controller architecture schematic diagram shown in Figure 5.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
Shown in Fig. 1～3, be followed successively by the system architecture of present regional central cooling system and refrigeration station cold supply system thereof, building central air-conditioning system utilizing system, wherein:
1, refrigeration station, 2, zone central cooling pipe network water supply pipeline, 3, zone central cooling pipe network water return pipeline, 4, secondary cold switching station, 5, building cooling pipe network water supply pipeline, 6, building cooling pipe network water return pipeline, 7, terminal air-conditioning equipment (comprises floor air conditioner, fan coil and new blower fan), 8, refrigeration host computer, 9, cold water frequency conversion water circulating pump, 10, ice bank, 11, ice-storage system frequency conversion water circulating pump, 12, refrigeration host computer leaving water temperature sensor, 13, refrigeration host computer water flow meter, 14, ice-storage system leaving water temperature sensor, 15, ice-storage system water flow meter, 16, the refrigeration station plate type heat exchanger, 17, refrigeration station plate type heat exchanger primary side supply water temperature sensor, 18, refrigeration station plate type heat exchanger primary side return water temperature sensor, 19, zone central cooling pipe network water supply temperature sensor, 20, zone central cooling pipe network return water temperature sensor, 21, zone central cooling pipe network frequency conversion water circulating pump, 22, zone central cooling pipe network water supply flowmeter, 23, zone central cooling pipe network is for the backwater differential pressure pickup, 24, secondary cold switching station plate type heat exchanger, 25, secondary cold switching station plate type heat exchanger primary side supply water temperature sensor, 26, secondary cold switching station plate type heat exchanger primary side return water temperature sensor, 27, building cooling pipe network water supply temperature sensor, 28, building cooling pipe network return water temperature sensor, 29, secondary cold switching station plate type heat exchanger primary side water supply flow control valve, 30, secondary cold switching station heat-exchangers of the plate type primary side water supply flow meter, 31, building cooling pipe network frequency conversion water circulating pump, 32, building cooling pipe network is for the backwater differential pressure pickup, 33, terminal air-conditioning equipment water supply flow control valve, 34, terminal controller, 35, the ambient temperature and humidity sensor
The present invention zone central cooling cold regulating system is applicable to above-mentioned zone central cooling system and refrigeration station cold supply system thereof, building central air-conditioning system utilizing system is carried out the cooling cold and regulate.As shown in Figure 5, one's respective area central cooling cold regulating system, comprise refrigeration station server 40, refrigeration station controller 36, secondary cold switching station controller 37, terminal controller 34, remote monitoring computer 41, local monitor computer 38, refrigeration station server 40 is connected with refrigeration station controller 36 and secondary cold switching station controller 37 by converter 39, a plurality of remote monitoring computers 41 are connected with refrigeration station controller 36 and a plurality of secondary cold switching station controller 37 by converter 39, and each secondary cold switching station controller 37 is connected respectively with local monitor computer 38 and a plurality of terminal controller 34 by industrial control network.
As shown in Figure 7, refrigeration station controller 36 is connected with analog quantity input module, analog output module, digital quantity input module, digital quantity output module; Analog quantity input module and refrigeration host computer 8, cold water frequency conversion water circulating pump 9, ice-storage system frequency conversion water circulating pump 11, refrigeration host computer leaving water temperature sensor 12, refrigeration host computer water flow meter 13, ice-storage system leaving water temperature sensor 14, ice-storage system water flow meter 15, refrigeration station heat-exchangers of the plate type primary side supply water temperature sensor 17, refrigeration station heat-exchangers of the plate type primary side return water temperature sensor 18, zone central cooling pipe network water supply temperature sensor 19, zone central cooling pipe network return water temperature sensor 20, zone central cooling pipe network frequency conversion periodical feeding pump 21, zone central cooling pipe network water supply flowmeter 22, zone central cooling pipe network connects respectively for backwater differential pressure pickup 23; Analog output module, digital quantity input module, digital quantity output module are connected with refrigeration host computer 8, cold water frequency conversion water circulating pump 9, ice-storage system frequency conversion water circulating pump 11, regional central cooling pipe network frequency conversion periodical feeding pump 21 respectively.
As shown in Figure 6, secondary cold switching station controller 37 and secondary cold switching station heat-exchangers of the plate type primary side supply water temperature sensor 25, secondary cold switching station heat-exchangers of the plate type primary side return water temperature sensor 26, building cooling pipe network water supply temperature sensor 27, building cooling pipe network return water temperature sensor 28, secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve 29, secondary cold switching station heat-exchangers of the plate type primary side water supply flow meter 30, building cooling pipe network frequency conversion water circulating pump 31, building cooling pipe network connects respectively for backwater differential pressure pickup 32.
As shown in Figure 3, terminal controller 34 is connected respectively with terminal air-conditioning equipment 7, terminal air-conditioning equipment water supply flow control valve 33, ambient temperature and humidity sensor 35.
Terminal air-conditioning equipment 7 comprises floor air conditioner, fan coil, new blower fan; The measured zone of ambient temperature and humidity sensor 35 comprises indoor and the fresh wind tube road.
The adjustment process of one's respective area central cooling cold regulating system, be to adopt three grades of reverse regulative modes of regional central cooling, comprise that the terminal air-conditioning equipment cold of central air-conditioning is regulated, regional central cooling secondary cold switching station cold is regulated, regional central cooling pipe network water supply adjustment, wherein:
(1) the terminal air-conditioning equipment cold of described central air-conditioning is regulated, be meant according to terminal air-conditioning equipment cold computing formula: Q=Cp*q* Δ T, wherein Q is a refrigeration duty, Cp is that specific heat of water holds, Δ T is the supply backwater temperature difference of terminal air-conditioning equipment, constant by keeping terminal air-conditioning equipment water supply flow q, satisfy setting range T≤Tmax with refrigerated area temperature, humidity, RH≤RHmax is the control target, building cooling pipe network water supply temperature is regulated, thereby Δ T is changed, realize the terminal air-conditioning equipment cold adjusting of central air-conditioning.
As shown in Figure 4, Tmax is the refrigerated area desired temperature upper limit, and Td is the building cooling supply water temperature upper limit that satisfies refrigerated area humidity set point upper limit RHmax correspondence, and curve 3 is a refrigeration duty Q change curve.Curve 1,2 is respectively building cooling supply water temperature supply water temperature and terminal air-conditioning equipment return water temperature adjustment curve in the refrigeration duty Q change procedure of the present invention.Curve T1, T2 are respectively terminal air-conditioning equipment supply water temperature of conventional central air conditioner system and return water temperature curve in the refrigeration duty Q change procedure, the terminal air-conditioning equipment cold of conventional central air conditioner system regulate adopt keep building cooling supply water temperature and terminal air-conditioning equipment return water temperature constant, regulate cold by regulating water supply flow.Tg, Th and Tgo, Tho are respectively under a certain refrigeration duty, and two kinds of control methods are built cooling supply water temperature and terminal air-conditioning equipment return water temperature operating point accordingly.The position, operating point adopts cold control method of the present invention can effectively improve building cooling supply water temperature and terminal air-conditioning equipment return water temperature as can be seen from Fig. 4.
The terminal air-conditioning equipment cold of central air-conditioning of the present invention is regulated, and step comprises:
(1) by terminal controller 34 terminal air-conditioning equipment water supply flow control valve 33 is opened to 100%;
(2) regulate secondary cold switching station heat-exchangers of the plate type primary side water supply control valve 29 apertures by the analog output module of secondary cold switching station controller 37, make secondary cold switching station heat-exchangers of the plate type primary side water supply flow meter 30 numerical value change, thereby building cooling pipe network water supply temperature and terminal air-conditioning equipment supply backwater temperature difference Δ T are changed, realize terminal air-conditioning equipment 7 colds are regulated.
(2) described regional central cooling secondary cold switching station cold is regulated, and its step comprises:
(1) searches temperature, humidity point automatically for the terminal air-conditioning equipment of least favorable operating point and carry out cold and regulate: when the secondary cold switching station that adopts regional central cooling is started working, the building refrigeration duty is maximum, and secondary cold switching station controller 37 is adjusted to 100% by analog output module with secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve 29 apertures; Start the terminal air-conditioning equipment 7 that needs refrigeration by terminal controller 34, and terminal air-conditioning equipment water supply flow control valve 33 is opened to 100%, realize fast-refrigerating;
The temperature that records when the ambient temperature and humidity sensor 35 in all zones that need freeze, it is T≤Tmax that humidity reaches setting range, behind RH≤RHmax, because indoor refrigeration duty reduces, indoor temperature, humidity begins to descend, this moment, secondary cold switching station controller 37 reduced secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve 29 apertures by analog output module, secondary cold switching station heat-exchangers of the plate type water supply flow meter 30 numerical value are reduced, thereby building cooling pipe network water supply temperature is raise, first environment temperature appears in building, the moisture measurement value be higher than the setting value upper limit (when T＞Tmax or RH＞RHmax), this temperature, the humidity point is current least favorable operating point;
Continue keep this least favorable operating point terminal air-conditioning equipment water supply flow control valve 33 aperture maximums by terminal controller 34 this moment, simultaneously, so that this least favorable operating point T≤Tmax, RH≤RHmax is the control target, regulate secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve 29 apertures by secondary cold switching station controller 37, secondary cold switching station heat-exchangers of the plate type primary side water supply flow is changed, thereby the supply backwater temperature difference Δ T value of building cooling pipe network water supply temperature and terminal air-conditioning equipment is changed, realize this least favorable operating point environment temperature, the automatic adjusting of the corresponding refrigeration duty in the control of humidity and this least favorable operating point; The building cooling pipe network water supply temperature value that obtain this moment is that Tg is the current building cooling of this building secondary cold switching station pipe network water supply control target temperature value; At this moment, then pass through to regulate terminal air-conditioning equipment water supply control valve 33 apertures, regulate terminal air-conditioning equipment 7 water supply flows and realize by terminal controller 34 for the adjusting of non-least favorable operating point environment temperature, humidity;
(2) dynamic adjustments of the dynamic identification of least favorable operating point and building cooling pipe network water supply temperature value Tg: because the variation of building interior refrigeration duty, the least favorable operating point is not constant, the environment temperature that occurs second terminal air-conditioning equipment 7 correspondence when cold supply system, humidity is higher than setting value, and recording these end air-conditioning equipment water supply flow control valve 33 apertures by terminal controller 34 is 100%, when this end air-conditioning equipment 7 is in running status always, then should temperature, the humidity point becomes new current least favorable operating point, and build cooling pipe network water supply temperature and regulate control by new least favorable operating point according to regional central cooling secondary cold switching station cold regulating step (1) this moment;
(3) adjusting of environment temperature when the RH=RHmax of least favorable operating point: by regulating terminal air-conditioning equipment water supply flow control valve 33 apertures, regulate terminal air-conditioning equipment 7 water supply flows and realize by terminal controller 34.
(3) described regional central cooling pipe network water supply adjustment, its step comprises:
(1) searches the secondary cold switching station of the least favorable operating point of the minimum and secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening maximum of Tg automatically: at all secondary cold switching station 4 performing steps (one), (2) afterwards, refrigeration station server 40 is gathered building cooling pipe network water supply temperature value Tg in all secondary cold switching station controllers 37 by converter 39, secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve 29 opening value K, and all Tg and K are compared, obtain Tg minimum of a value Tg-min and K maximum Kmax, the secondary cold switching station 4 of Tg-min and Kmax correspondence is the secondary cold switching station 4 of least favorable operating point:
(2) refrigeration station cooling leaving water temperature is regulated: refrigeration station server 40 sends to refrigeration station controller 36 by converter 39 with Tg-min and Kmax value, refrigeration station controller 36 is the control target with Tg-min, so that Kmax≤90% (all the other 10% cold adjusting surpluses as the reservation of secondary cold switching station) is a constraints, regulate refrigeration host computer 8 leaving water temperature set-points by analog output module, or the frequency of regulating ice-storage system frequency conversion water circulating pump 11 is given to regulate frozen water Flow-rate adjustment district cooling pipe network water supply temperature value, realizes the servo-actuated control to Tg-min;
(3) the refrigeration station cooling is minimum determines and the water supply flow adjusting for backwater pressure differential deltap Pmin: refrigeration station server 40 sends secondary cold switching station heat-exchangers of the plate type primary side water supply control valve 29 by converter 39 to all secondary cold switching station controllers 37 and is opened into 100% imperative instruction, and read all secondary cold switching station heat-exchangers of the plate type primary side water supply control valve 29 opening values, after all secondary cold switching station heat-exchangers of the plate type primary side water supply control valves 29 are opened into 100%, read secondary cold switching station heat-exchangers of the plate type primary side water supply flow meter 30 numerical value again, and send the pipe network Flow-rate adjustment to refrigeration station controller 36 and instruct, refrigeration station controller 36 is by analog output module and digital quantity output module control band central cooling pipe network frequency conversion water circulating pump 21 frequencies and platform number, make all secondary cold switching station heat-exchangers of the plate type primary side water supply flow meter 30 numerical value reach design discharge, refrigeration station 1 cooling that this moment, refrigeration station controller 36 recorded is minimum for backwater pressure differential deltap Pmin for backwater pressure differential deltap P, after obtaining Δ Pmin, refrigeration station server 40 sends secondary cold switching station heat-exchangers of the plate type primary side water supply control valve by converter 39 to all secondary cold switching station controllers 37 and is opened into 100% releasing instruction, refrigeration station controller 36 serves as for backwater pressure differential resetting value with Δ Pmin, by analog output module and digital quantity output module control band central cooling pipe network frequency conversion water circulating pump 21 frequencies and platform number, it is constant that Δ Pmin is kept, and realizes the adjusting to the district cooling flow;
(4) the dynamic identification of least favorable secondary cold switching station: refrigeration station server 40 is constantly gathered building cooling pipe network water supply temperature value Tg in all secondary cold switching station controllers 37 by converter 39, secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve 29 opening value K, and all Tg and K are compared, obtain current Tg minimum of a value Tg-min and K maximum Kmax, the secondary cold switching station 4 of Tg-min and Kmax correspondence is the secondary cold switching station 4 of current least favorable operating point, and this moment, refrigeration station 1 regulated by the thermoregulator step of above-mentioned zone central cooling pipe network water supply (2).
As mentioned above, just can realize the present invention preferably.
Claims (4)
1, regional central cooling cold control method, it is characterized in that: adopt three grades of reverse regulative modes of regional central cooling, it comprises successively, and central air-conditioning end-equipment cold is regulated, regional central cooling secondary cold switching station cold is regulated, these three steps of regional central cooling pipe network water supply adjustment.
2, by the described regional central cooling cold control method of claim 1, it is characterized in that the terminal air-conditioning equipment cold adjusting of described central air-conditioning, be meant according to terminal air-conditioning equipment cold Q=Cp*q* Δ T, wherein Q is a refrigeration duty, Cp is that specific heat of water holds, Δ T is the supply backwater temperature difference of terminal air-conditioning equipment, constant by keeping terminal air-conditioning equipment water supply flow q, with the refrigerated area temperature, humidity satisfies setting range T≤Tmax, RH≤RHmax is the control target, building cooling pipe network water supply temperature is regulated, thereby Δ T is changed, realize the terminal air-conditioning equipment cold adjusting of central air-conditioning, its step comprises:
(1) by terminal controller terminal air-conditioning equipment water supply flow control valve is opened to 100%;
(2) regulate secondary cold switching station heat-exchangers of the plate type primary side water supply control valve opening by the analog output module of secondary cold switching station controller, secondary cold switching station heat-exchangers of the plate type primary side water supply flow count value is changed, thereby building cooling pipe network water supply temperature and terminal air-conditioning equipment supply backwater temperature difference Δ T are changed, realize terminal air-conditioning equipment cold is regulated.
3, by the described regional central cooling cold control method of claim 2, it is characterized in that described regional central cooling secondary cold switching station cold adjusting, its step comprises:
(1) searches temperature, humidity point automatically for the terminal air-conditioning equipment of least favorable operating point and carry out cold and regulate: when the secondary cold switching station that adopts regional central cooling is started working, the building refrigeration duty be a maximum, and the analog output module by secondary cold switching station controller is adjusted to 100% with secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening; Start the terminal air-conditioning equipment that needs refrigeration by terminal controller, and terminal air-conditioning equipment water supply flow control valve is opened to 100%, realize fast-refrigerating;
When all temperature that needs the ambient temperature and humidity sensor of refrigerated area to record, it is T≤Tmax that humidity reaches setting range, behind RH≤RHmax, because indoor refrigeration duty reduces, indoor temperature, humidity begins to descend, this moment, secondary cold switching station controller reduced secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening by analog output module, secondary cold switching station heat-exchangers of the plate type primary side water supply flow is reduced, thereby improve building cooling pipe network water supply temperature, first environment temperature appears in building, the moisture measurement value exceeds the setting value upper limit when being T＞Tmax or RH＞RHmax, this temperature, the humidity point is current least favorable operating point;
Continue keep this least favorable operating point terminal air-conditioning equipment water supply flow control valve opening maximum by terminal controller this moment, simultaneously, so that this least favorable operating point T≤Tmax, RH≤RHmax is the control target, regulate secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening by secondary cold switching station controller, secondary cold switching station heat-exchangers of the plate type primary side water supply flow is changed, thereby the supply backwater temperature difference Δ T value of building cooling pipe network water supply temperature and terminal air-conditioning equipment is changed, realize this least favorable operating point environment temperature, the automatic adjusting of the corresponding refrigeration duty in the control of humidity and this least favorable operating point; The building cooling pipe network water supply temperature value that obtain this moment is that Tg is the current building cooling of this building secondary cold switching station pipe network water supply control target temperature value; At this moment, then pass through to regulate terminal air-conditioning equipment water supply control valve opening, regulate terminal air-conditioning equipment water supply flow and realize by terminal controller for the adjusting of non-least favorable operating point environment temperature, humidity;
(2) dynamic adjustments of the dynamic identification of least favorable operating point and building cooling pipe network water supply temperature value Tg: because the variation of building interior refrigeration duty, the least favorable operating point is not constant, the environment temperature that occurs second terminal air-conditioning equipment correspondence when cold supply system, it is T＞Tmax or RH＞RHmax that humidity is higher than setting value, and recording this end air-conditioning equipment water supply flow control valve opening by terminal controller is 100%, when this end air-conditioning equipment is in running status always, then should temperature, the humidity point becomes new current least favorable operating point, and build cooling pipe network water supply temperature and regulate control by new least favorable operating point according to regional central cooling secondary cold switching station cold regulating step (1) this moment;
(3) adjusting of environment temperature when the RH=RHmax of least favorable operating point: by regulating terminal air-conditioning equipment water supply flow control valve opening, regulate terminal air-conditioning equipment water supply flow and realize by terminal controller.
4, by the described regional central cooling cold control method of claim 3, it is characterized in that described regional central cooling pipe network water supply adjustment, its step comprises:
(1) searches the least favorable operating point secondary cold switching station of the minimum and secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening maximum of Tg automatically: realize the adjusting of central air-conditioning end-equipment colds at all secondary cold switching stations, zone central cooling secondary cold switching station cold is regulated after these two steps, the refrigeration station server is gathered building cooling pipe network water supply temperature value Tg in all secondary cold switching station controllers by converter, secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening value K, and all Tg and K are compared, obtain Tg minimum of a value Tg-min and K maximum Kmax, the secondary cold switching station of Tg-min and Kmax correspondence is the secondary cold switching station of least favorable operating point;
(2) refrigeration station cooling leaving water temperature is regulated: the refrigeration station server sends to the refrigeration station controller by converter with Tg-min and Kmax value, the refrigeration station controller is the control target with Tg-min, so that Kmax≤90% is a constraints, regulate refrigeration host computer leaving water temperature set-point by analog output module, or the frequency of regulating ice-storage system frequency conversion water circulating pump is given to regulate frozen water Flow-rate adjustment district cooling pipe network water supply temperature value, realizes the servo-actuated control to Tg-min;
(3) the refrigeration station cooling is minimum determines and the water supply flow adjusting for backwater pressure differential deltap Pmin: the refrigeration station server sends secondary cold switching station heat-exchangers of the plate type primary side water supply control valve by converter to all secondary cold switching station controllers and is opened into 100% imperative instruction, and read all secondary cold switching station heat-exchangers of the plate type primary side water supply control valve opening values, after all secondary cold switching station heat-exchangers of the plate type primary side water supply control valves are opened into 100%, read secondary cold switching station heat-exchangers of the plate type primary side water supply flow q value again and send the instruction of pipe network Flow-rate adjustment to the refrigeration station controller, the refrigeration station controller is by analog output module and digital quantity output module control band cooling variable frequency water supply pump frequency and platform number, make all secondary cold switching station heat-exchangers of the plate type primary side water supply flow q values reach design discharge, the refrigeration station cooling that this moment, the refrigeration station controller recorded is minimum for backwater pressure differential deltap Pmin for backwater pressure differential deltap P, after obtaining Δ Pmin, the refrigeration station server sends secondary cold switching station heat-exchangers of the plate type primary side water supply control valve by converter to all secondary cold switching station controllers and is opened into 100% releasing instruction, the refrigeration station controller serves as for backwater pressure differential resetting value with Δ Pmin, by analog output module and digital quantity output module control band cooling variable frequency water supply pump frequency and platform number, it is constant that Δ Pmin is kept, and realizes the adjusting to the district cooling flow;
(4) the dynamic identification of least favorable secondary cold switching station: the refrigeration station server is constantly gathered building cooling pipe network water supply temperature value Tg in all secondary cold switching station controllers by converter, secondary cold switching station heat-exchangers of the plate type primary side water supply flow control valve opening value K, and all Tg and K are compared, obtain current Tg minimum of a value Tg-min and K maximum Kmax, the secondary cold switching station of Tg-min and Kmax correspondence is the secondary cold switching station of current least favorable operating point, and this moment, refrigeration station regulated by the thermoregulator step of above-mentioned zone central cooling pipe network water supply (2).
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