CN105352119A - Method and device for controlling refrigeration water system in air conditioner - Google Patents

Method and device for controlling refrigeration water system in air conditioner Download PDF

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Publication number
CN105352119A
CN105352119A CN201510756821.2A CN201510756821A CN105352119A CN 105352119 A CN105352119 A CN 105352119A CN 201510756821 A CN201510756821 A CN 201510756821A CN 105352119 A CN105352119 A CN 105352119A
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China
Prior art keywords
temperature
temperature difference
chilled water
output
temperature range
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CN201510756821.2A
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CN105352119B (en
Inventor
刘羽松
钟丹艳
刘国林
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data

Abstract

The invention discloses a method and device for controlling a refrigeration water system in an air conditioner. The method includes the steps that the temperature difference between the air returning wet-bulb temperature and the air feeding wet-bulb temperature of a target tail end device is detected; whether the temperature difference is within a preset temperature difference range or not is judged; when it is judged that the temperature difference is within the preset temperature difference range, the operating state of the refrigeration water system keeps unchanged; and when it is judged that the temperature difference is not within the preset temperature difference range, the water supplying amount or the water supplying temperature of the refrigeration water system is adjusted to enable the temperature difference to be within the preset temperature difference range. By means of the method and device, the technical problem that the energy consumption of the refrigeration water system of an air conditioner system is high is solved.

Description

The control method of chilled water system and device in air-conditioning
Technical field
The present invention relates to field of air conditioning, the control method of chilled water system and device in a kind of air-conditioning.
Background technology
In traditional air-conditioning system, chilled water supply water temperature is set as 7 DEG C, when after main frame off-load to minimum load, improves chilled water supply water temperature.When main frame loads, chilled water supply water temperature is constant, improves chilled-water flow to meet end demand.This traditional air-conditioning system, when regulating temperature or the output of chilled water, adopts the mode of Non-follow control, cannot judge the supply water temperature required for air-conditioning system and output accurately, cause the chilled water system energy consumption of air-conditioning system higher.
For above-mentioned problem, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide control method and the device of chilled water system in a kind of air-conditioning, with the technical problem that the chilled water system energy consumption at least solving air-conditioning system is higher.
According to an aspect of the embodiment of the present invention, provide the control method of chilled water system in a kind of air-conditioning, comprising: detect the return air wet-bulb temperature of target end-equipment and the temperature difference of air-supply wet-bulb temperature; Judge whether described temperature difference is in default temperature range; When judging that described temperature difference is in described default temperature range, the running status maintaining described chilled water system is constant; When judging that described temperature difference is not in described default temperature range, regulating output or the supply water temperature of described chilled water system, being in described default temperature range to make described temperature difference.
Further, when judging that described temperature difference is not in described default temperature range, regulate output or the supply water temperature of described chilled water system, be in described default temperature range to make described temperature difference and comprise: judge whether described temperature difference is greater than the maximum of described default temperature range; When judging that described temperature difference is greater than described maximum, reduce the output of described chilled water, until described temperature difference is in described default temperature range.
Further, reduce the output of described chilled water, comprise until described temperature difference is in described default temperature range: judge whether current output is less than or equal to output lower limit; Judging to prescribe a time limit under described current output is less than or equal to described output, stop the output reducing described chilled water, and improve the supply water temperature of described chilled water when keeping described current output, until described temperature difference is in described default temperature range.
Further, when judging that described temperature difference is not in described default temperature range, regulate output or the supply water temperature of described chilled water system, be in described default temperature range to make described temperature difference and comprise: judge whether described temperature difference is less than the minimum of a value of described default temperature range; When judging that described temperature difference is less than described minimum of a value, reduce the supply water temperature of described chilled water, until described temperature difference is in described default temperature range.
Further, reduce the supply water temperature of described chilled water, comprise until described temperature difference is in described default temperature range: judge whether current supply water temperature is less than or equal to supply water temperature lower limit; Judging to prescribe a time limit under described current supply water temperature is less than or equal to described supply water temperature, stop the supply water temperature reducing described chilled water, and improve the output of described chilled water when keeping described current supply water temperature, until described temperature difference is in described default temperature range.
Further, the temperature difference of the return air wet-bulb temperature and air-supply wet-bulb temperature that detect target end-equipment comprises: the aperture of patrolling and examining the chilled water water valve of all end-equipments in described air-conditioning; Search the water valve that described aperture is maximum; Using end-equipment corresponding for water valve maximum for described aperture as described target end-equipment.
According to the another aspect of the embodiment of the present invention, additionally provide the control device of chilled water system in a kind of air-conditioning, comprising: detecting unit, for detect target end-equipment return air wet-bulb temperature and air-supply wet-bulb temperature temperature difference; Judging unit, for judging whether described temperature difference is in default temperature range; Maintain unit, for when judging that described temperature difference is in described default temperature range, the running status maintaining described chilled water system is constant; Regulon, for when judging that described temperature difference is not in described default temperature range, regulates output or the supply water temperature of described chilled water system, is in described default temperature range to make described temperature difference.
Further, described regulon comprises: the first judge module, for judging whether described temperature difference is greater than the maximum of described default temperature range; First control module, for when judging that described temperature difference is greater than described maximum, reduces the output of described chilled water, until described temperature difference is in described default temperature range.
Further, described first control module comprises: first judges submodule, for judging whether current output is less than or equal to output lower limit; First controls submodule, for judging to prescribe a time limit under described current output is less than or equal to described output, stop the output reducing described chilled water, and improve the supply water temperature of described chilled water when keeping described current output, until described temperature difference is in described default temperature range.
Further, described regulon comprises: the second judge module, for judging whether described temperature difference is less than the minimum of a value of described default temperature range; Second control module, for when judging that described temperature difference is less than described minimum of a value, reduces the supply water temperature of described chilled water, until described temperature difference is in described default temperature range.
Further, described second control module comprises: second judges submodule, for judging whether current supply water temperature is less than or equal to supply water temperature lower limit; Second controls submodule, for judging to prescribe a time limit under described current supply water temperature is less than or equal to described supply water temperature, stop the supply water temperature reducing described chilled water, and improve the output of described chilled water when keeping described current supply water temperature, until described temperature difference is in described default temperature range.
Further, described detecting unit comprises: polling module, for patrolling and examining the aperture of the chilled water water valve of all end-equipments in described air-conditioning; Search module, for searching the maximum water valve of described aperture; Determination module, for using end-equipment corresponding for water valve maximum for described aperture as described target end-equipment.
In embodiments of the present invention, the temperature difference of the return air wet-bulb temperature detecting target end-equipment and air-supply wet-bulb temperature is adopted; Judge whether temperature difference is in default temperature range; When judging that temperature difference is in default temperature range, the running status maintaining chilled water system is constant; When judging that temperature difference is not in default temperature range, regulate output or the supply water temperature of chilled water system, in the mode making temperature difference be in default temperature range, solve the technical problem that the chilled water system energy consumption of air-conditioning system is higher, reach the technique effect saving chilled water system energy consumption.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the control method of chilled water system in the air-conditioning according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the control device of chilled water system in the air-conditioning according to the embodiment of the present invention.
Detailed description of the invention
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in description of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
According to the embodiment of the present invention, provide the embodiment of the method for the control method of chilled water system in a kind of air-conditioning, the method can be applied in the air-conditioning equipments such as central air-conditioning, along with the change of indoor temperature regulates output and the supply water temperature of chilled water in air conditioner refrigerating process, make output and supply water temperature dynamic change instead of fixing, match with the workload demand of end-equipment better, thus reduce the energy consumption of chilled water system, and then reduce the energy consumption of air-conditioning.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Fig. 1 is the flow chart of the control method of chilled water system in the air-conditioning according to the embodiment of the present invention, and as shown in Figure 1, the method comprises the steps:
Step S102, detects the return air wet-bulb temperature of target end-equipment and the temperature difference of air-supply wet-bulb temperature.The chilled water of air-conditioning pressurizes via water pump, and flow into chilled water pipeline, the end-equipment entering air-conditioning carries out heat exchange in indoor, takes away the heat in room, achieves the object reducing indoor temperature.The difference of indoor temperature and design temperature is larger, then the refrigerating capacity of end-equipment needs is larger, otherwise the difference of indoor design temperature and design temperature is less, and the refrigerating capacity that end-equipment needs is less.Because the temperature difference between return air wet-bulb temperature and air-supply wet-bulb temperature can embody the difference of indoor temperature and design temperature, therefore, can control chilled water system according to the temperature difference of the return air wet-bulb temperature and air-supply wet-bulb temperature that detect target end-equipment.
Step S104, judges whether temperature difference is in default temperature range.In air conditioning system with variable, setting indoor return air wet-bulb temperature and air-supply wet-bulb temperature difference T sqcfor steady state value, allowable fluctuation range is ± Δ T.In Constant air volume system, set indoor return air wet-bulb temperature and air-supply wet-bulb temperature difference T under operating mode at full capacity sqcmfor steady state value, when actual load is fully loaded A% (0≤A≤100), the T under this actual load sqc=A% × T sqcm, allowable fluctuation range is ± Δ T.Therefore, in air conditioning system with variable or in Constant air volume system, presetting temperature range is [T sqc-Δ T, T sqc+ Δ T], the temperature difference of return air wet-bulb temperature and air-supply wet-bulb temperature can be expressed as T c.
Step S106, when judging that temperature difference is in default temperature range, the running status maintaining chilled water system is constant.When temperature difference is in default temperature range, namely at T sqc-Δ T≤T c≤ T sqcduring+Δ T, chilled water system now meets the needs of target end-equipment for refrigerating capacity that target end-equipment provides, and can not be excessive or too small, then keep the running status of current chilled water system constant.
Step S108, when judging that temperature difference is not in default temperature range, regulating output or the supply water temperature of chilled water system, being in default temperature range to make temperature difference.When temperature difference is not in default temperature range, namely at T c> T sqcduring+Δ T, the refrigerating capacity that chilled water system provides exceeds the needs of target end-equipment and causes the waste of energy consumption, needs to regulate chilled water system to reduce energy consumption, avoids the waste of energy consumption; At T c< T sqcduring-Δ T, the needs that the refrigerating capacity that chilled water provides is discontented with foot-eye end-equipment cannot reach the requirement reducing indoor temperature, need to regulate chilled water system to reduce indoor temperature.
The refrigerating capacity that chilled water system provides can be regulated by the output of chilled water and supply water temperature, can reduce the temperature of chilled water or increase the output of chilled water when needing larger refrigerating capacity; The temperature of chilled water can be raised when needing less refrigerating capacity or reduce the output of chilled water.Therefore, when judging that temperature difference is not in default temperature range, making temperature difference be in default temperature range by the output and supply water temperature regulating chilled water, not only meeting the refrigeration needs of target end-equipment but also save energy consumption.
Pass through above-described embodiment, dynamic adjustments output or supply water temperature make the temperature difference of return air wet-bulb temperature and air-supply wet-bulb temperature be in suitable scope, avoiding output or supply water temperature, to be in the energy consumption that fixed value causes higher, reduce the energy consumption of chilled water system, solve the technical problem that the chilled water system energy consumption of air-conditioning system is higher.In addition, this embodiment controls output and supply water temperature according to the temperature difference of return air wet-bulb temperature and air-supply wet-bulb temperature, avoid the load of prior art artificial judgment main frame and the inaccurate problem of Non-follow control, achieve the effect accurately controlling the refrigerating capacity that chilled water system exports, also reduce further the energy consumption of cooling water system for air conditioning, solve the technical problem that the chilled water system energy consumption of air-conditioning system is higher, reach the technique effect saving chilled water system energy consumption, also create a further reduction the energy consumption of air-conditioning system.
Alternatively, air-conditioning system can by multiple end-equipment, such as fan coil, in order to regulate output and supply water temperature accurately, detect the return air wet-bulb temperature of the target end-equipment in multiple end-equipment and the temperature difference of air-supply wet-bulb temperature, can determine target end-equipment in the following ways, the temperature difference of the return air wet-bulb temperature and air-supply wet-bulb temperature that namely detect target end-equipment comprises: the aperture of patrolling and examining the chilled water water valve of all end-equipments in air-conditioning; Search the water valve that aperture is maximum; Using end-equipment corresponding for water valve maximum for aperture as target end-equipment.Patrol and examine all end chilled water water valves (V1, V2 ... Vn) aperture, find the maximum water valve of aperture to be Vm, using end-equipment corresponding for Vm as this target end-equipment, detect the indoor return air wet-bulb temperature of this target end-equipment and air-supply wet-bulb temperature difference T c.
Poor with air-supply wet-bulb temperature according to the indoor return air wet-bulb temperature of target end-equipment, achieve and the output of chilled water in air-conditioning system and the dynamic and intelligentization of supply water temperature are controlled, reach energy-conservation object.
The temperature difference T of the target end-equipment detected cwhen not being in default temperature range, have two kinds of situations, one is T c> T sqc+ Δ T, another is T c< T sqc-Δ T, judges both of these case respectively, and controls output or supply water temperature according to corresponding judged result.Wherein, first T can be judged c> T sqc+ Δ T, also first can judge T c< T sqc-Δ T, does not limit herein, is described respectively below to the control method under both of these case:
The first, T c> T sqc+ Δ T.
Alternatively, when judging that temperature difference is not in default temperature range, regulating output or the supply water temperature of chilled water system, being in default temperature range to make temperature difference and comprising: judge whether temperature difference is greater than the maximum of default temperature range; When judging that temperature difference is greater than maximum, reduce the output of chilled water, until temperature difference is in default temperature range.When temperature difference is more than or equal to maximum, refrigerating capacity is excessive, and the mode of the output reducing chilled water can be adopted to reduce the refrigerating capacity of supply target end-equipment, until temperature difference is in default temperature range.
Alternatively, reduce the output of chilled water, comprise until temperature difference is in default temperature range: judge whether current output is less than or equal to output lower limit; Judging to prescribe a time limit under current output is less than or equal to output, stopping the output reducing chilled water, and improving the supply water temperature of chilled water when keeping current output, until temperature difference is in default temperature range.Because output has lower limit, output can not be reduced to when reduction output and be less than output lower limit.Output lower limit can be 50% of total flow, changes according to the model of air-conditioning system or environment for use.If temperature difference can not be made to be in default temperature range by reducing output, then improve supply water temperature, improve the temperature of chilled water when less output, also can reduce T c, make T cget back to default temperature range.
Such as, the temperature that indoor return air wet-bulb temperature detects is 27 DEG C, and the temperature that air-supply wet-bulb temperature detects is 23 DEG C, temperature difference T cit is 4 DEG C.T sqcbe 3 DEG C, Δ T is 0.5 DEG C.Visible, T c> T sqc+ Δ T, then first reduce the output of chilled water, makes temperature difference be in default temperature range, if the output reducing chilled water cannot make temperature difference be in default temperature range, then improves the temperature of chilled water, thus make T cget back to default temperature range.Temperature difference T between real-time detection indoor return air wet-bulb temperature and air-supply wet-bulb temperature c, make T sqc-Δ T≤T c≤ T sqc+ Δ T.
In this embodiment, the output reducing chilled water system and the supply water temperature improving chilled water can reduce the power consumption of chilled water system, reach the effect of saving energy consumption.
The second, T c< T sqc+ Δ T.
Alternatively, when judging that temperature difference is not in default temperature range, regulating output or the supply water temperature of chilled water system, being in default temperature range to make temperature difference and comprising: judge whether temperature difference is less than the minimum of a value of default temperature range; When judging that temperature difference is less than minimum of a value, reduce the supply water temperature of chilled water, until temperature difference is in default temperature range.When temperature difference is less than or equal to minimum of a value, refrigerating capacity is not enough, the mode of the supply water temperature reducing chilled water can be adopted to the refrigerating capacity of target end-equipment of increasing supply, until temperature difference is in default temperature range.
Alternatively, reduce the supply water temperature of chilled water, comprise until temperature difference is in default temperature range: judge whether current supply water temperature is less than or equal to supply water temperature lower limit; Judging to prescribe a time limit under current supply water temperature is less than or equal to supply water temperature, stopping the supply water temperature reducing chilled water, and improving the output of chilled water when keeping current supply water temperature, until temperature difference is in default temperature range.Because supply water temperature has lower limit, supply water temperature can not be reduced to when reduction supply water temperature and be less than supply water temperature lower limit.Supply water temperature lower limit such as 5 DEG C (usual supply water temperature is 7 DEG C), according to the model of air-conditioning system or environment for use different and change.If temperature difference can not be made to be in default temperature range by reducing supply water temperature, then increase output, increase the output of chilled water when less supply water temperature, also can increase T c, make T cget back to default temperature range.
Such as, the temperature that indoor return air wet-bulb temperature detects is 27 DEG C, and the temperature that air-supply wet-bulb temperature detects is 25 DEG C, temperature difference T cit is 2 DEG C.T sqcbe 3 DEG C, Δ T is 0.5 DEG C.Visible, T c< T sqc+ Δ T, then first reduce the supply water temperature of chilled water, makes temperature difference be in default temperature range, if the supply water temperature reducing chilled water cannot make temperature difference be in default temperature range, then increases the output of chilled water, thus make T cget back to default temperature range.Temperature difference T between real-time detection indoor return air wet-bulb temperature and air-supply wet-bulb temperature c, make T sqc-Δ T≤T c≤ T sqc+ Δ T.
In this embodiment, chilled water system may operate in the state of saving energy consumption, needing reduce the supply water temperature of chilled water system when increasing refrigerating capacity again and increase the output of chilled water, achieves dynamic adjustments supply water temperature and output.Compare with the mode of Non-follow control chilled water system when minimum load in maximum load with prior art, this embodiment is more accurate to the control of chilled water system, and regulates in real time according to the demand of target terminal, can better realize energy-conservation object.
In the above-described embodiments, can be regulated the water supply flow of chilled water by the running frequency controlling water pump, the running frequency reducing water pump reduces water supply flow, and the running frequency increasing water pump increases water supply flow.
In sum, this embodiment tool has the following advantages:
1, at part load, pump consumption or host power consumption can be reduced, improve the operational efficiency of whole chilled water system.
2, the power consumption of chilled water system and the power consumption of air-conditioning system is reduced.
According to the embodiment of the present invention, provide the device embodiment of the control device of chilled water system in a kind of air-conditioning.In this air-conditioning, the control device of chilled water system can perform the control method of chilled water system in above-mentioned air-conditioning, and in above-mentioned air-conditioning, the control method of chilled water system also can be performed by the control device of chilled water system in this air-conditioning.
As shown in Figure 2, in this air-conditioning, the control device of chilled water system comprises: detecting unit 10, judging unit 20, maintenance unit 30 and regulon 40.Wherein:
Detecting unit 10 for detect target end-equipment return air wet-bulb temperature and air-supply wet-bulb temperature temperature difference.The chilled water of air-conditioning pressurizes via water pump, and flow into chilled water pipeline, the end-equipment entering air-conditioning carries out heat exchange in indoor, takes away the heat in room, achieves the object reducing indoor temperature.The difference of indoor temperature and design temperature is larger, then the refrigerating capacity of end-equipment needs is larger, otherwise the difference of indoor design temperature and design temperature is less, and the refrigerating capacity that end-equipment needs is less.Because the temperature difference between return air wet-bulb temperature and air-supply wet-bulb temperature can embody the difference of indoor temperature and design temperature, therefore, can control chilled water system according to the temperature difference of the return air wet-bulb temperature and air-supply wet-bulb temperature that detect target end-equipment.
Judging unit 20 is for judging whether temperature difference is in default temperature range.In air conditioning system with variable, setting indoor return air wet-bulb temperature and air-supply wet-bulb temperature difference T sqcfor steady state value, allowable fluctuation range is ± Δ T.In Constant air volume system, set indoor return air wet-bulb temperature and air-supply wet-bulb temperature difference T under operating mode at full capacity sqcmfor steady state value, when actual load is fully loaded A% (0≤A≤100), the T under this actual load sqc=A% × T sqcm, allowable fluctuation range is ± Δ T.Therefore, in air conditioning system with variable or in Constant air volume system, presetting temperature range is [T sqc-Δ T, T sqc+ Δ T], the temperature difference of return air wet-bulb temperature and air-supply wet-bulb temperature can be expressed as T c.
Maintain unit 30 for when judging that temperature difference is in default temperature range, the running status maintaining chilled water system is constant.When temperature difference is in default temperature range, namely at T sqc-Δ T≤T c≤ T sqcduring+Δ T, chilled water system now meets the needs of target end-equipment for refrigerating capacity that target end-equipment provides, and can not be excessive or too small, then keep the running status of current chilled water system constant.
Regulon 40, for when judging that temperature difference is not in default temperature range, regulating output or the supply water temperature of chilled water system, being in default temperature range to make temperature difference.When temperature difference is not in default temperature range, namely at T c> T sqcduring+Δ T, the refrigerating capacity that chilled water system provides exceeds the needs of target end-equipment and causes the waste of energy consumption, needs to regulate chilled water system to reduce energy consumption, avoids the waste of energy consumption; At T c< T sqcduring-Δ T, the needs that the refrigerating capacity that chilled water provides is discontented with foot-eye end-equipment cannot reach the requirement reducing indoor temperature, need to regulate chilled water system to reduce indoor temperature.
The refrigerating capacity that chilled water system provides can be regulated by the output of chilled water and supply water temperature, can reduce the temperature of chilled water or increase the output of chilled water when needing larger refrigerating capacity; The temperature of chilled water can be raised when needing less refrigerating capacity or reduce the output of chilled water.Therefore, when judging that temperature difference is not in default temperature range, making temperature difference be in default temperature range by the output and supply water temperature regulating chilled water, not only meeting the refrigeration needs of target end-equipment but also save energy consumption.
Pass through above-described embodiment, dynamic adjustments output or supply water temperature make the temperature difference of return air wet-bulb temperature and air-supply wet-bulb temperature be in suitable scope, avoiding output or supply water temperature, to be in the energy consumption that fixed value causes higher, reduce the energy consumption of chilled water system, solve the technical problem that the chilled water system energy consumption of air-conditioning system is higher.In addition, this embodiment controls output and supply water temperature according to the temperature difference of return air wet-bulb temperature and air-supply wet-bulb temperature, avoid the load of prior art artificial judgment main frame and the inaccurate problem of Non-follow control, achieve the effect accurately controlling the refrigerating capacity that chilled water system exports, also reduce further the energy consumption of cooling water system for air conditioning, solve the technical problem that the chilled water system energy consumption of air-conditioning system is higher, reach the technique effect saving chilled water system energy consumption, also create a further reduction the energy consumption of air-conditioning system.
Alternatively, air-conditioning system can by multiple end-equipment, such as fan coil, in order to regulate output and supply water temperature accurately, detect the return air wet-bulb temperature of the target end-equipment in multiple end-equipment and the temperature difference of air-supply wet-bulb temperature, can determine target end-equipment in the following ways, namely detecting unit comprises: polling module, for patrolling and examining the aperture of the chilled water water valve of all end-equipments in air-conditioning; Search module, for searching the maximum water valve of aperture; Determination module, for using end-equipment corresponding for water valve maximum for aperture as target end-equipment.Patrol and examine all end chilled water water valves (V1, V2 ... Vn) aperture, find the maximum water valve of aperture to be Vm, using end-equipment corresponding for Vm as this target end-equipment, detect the indoor return air wet-bulb temperature of this target end-equipment and air-supply wet-bulb temperature difference T c.
Poor with air-supply wet-bulb temperature according to the indoor return air wet-bulb temperature of target end-equipment, achieve and the output of chilled water in air-conditioning system and the dynamic and intelligentization of supply water temperature are controlled, reach energy-conservation object.
The temperature difference T of the target end-equipment detected cwhen not being in default temperature range, have two kinds of situations, one is T c> T sqc+ Δ T, another is T c< T sqc-Δ T, judges both of these case respectively, and controls output or supply water temperature according to corresponding judged result.Wherein, first T can be judged c> T sqc+ Δ T, also first can judge T c< T sqc-Δ T, does not limit herein, is described respectively below to the control method under both of these case:
The first, T c> T sqc+ Δ T.
Alternatively, regulon comprises: the first judge module, for judging whether temperature difference is greater than the maximum of default temperature range; First control module, for when judging that temperature difference is greater than maximum, reduces the output of chilled water, until temperature difference is in default temperature range.When temperature difference is more than or equal to maximum, refrigerating capacity is excessive, and the mode of the output reducing chilled water can be adopted to reduce the refrigerating capacity of supply target end-equipment, until temperature difference is in default temperature range.
Alternatively, the first control module comprises: first judges submodule, for judging whether current output is less than or equal to output lower limit; First controls submodule, for judging to prescribe a time limit under current output is less than or equal to output, stopping the output reducing chilled water, and improving the supply water temperature of chilled water when keeping current output, until temperature difference is in default temperature range.
Because output has lower limit, output can not be reduced to when reduction output and be less than output lower limit.Output lower limit can be 50% of total flow, changes according to the model of air-conditioning system or environment for use.If temperature difference can not be made to be in default temperature range by reducing output, then improve supply water temperature, improve the temperature of chilled water when less output, also can reduce T c, make T cget back to default temperature range.
Such as, the temperature that indoor return air wet-bulb temperature detects is 27 DEG C, and the temperature that air-supply wet-bulb temperature detects is 23 DEG C, temperature difference T cit is 4 DEG C.T sqcbe 3 DEG C, Δ T is 0.5 DEG C.Visible, T c> T sqc+ Δ T, then first reduce the output of chilled water, makes temperature difference be in default temperature range, if the output reducing chilled water cannot make temperature difference be in default temperature range, then improves the temperature of chilled water, thus make T cget back to default temperature range.Temperature difference T between real-time detection indoor return air wet-bulb temperature and air-supply wet-bulb temperature c, make T sqc-Δ T≤T c≤ T sqc+ Δ T.
In this embodiment, the output reducing chilled water system and the supply water temperature improving chilled water can reduce the power consumption of chilled water system, reach the effect of saving energy consumption.
The second, T c< T sqc+ Δ T.
Alternatively, regulon comprises: the second judge module, for judging whether temperature difference is less than the minimum of a value of default temperature range; Second control module, for when judging that temperature difference is less than minimum of a value, reduces the supply water temperature of chilled water, until temperature difference is in default temperature range.When temperature difference is less than or equal to minimum of a value, refrigerating capacity is not enough, the mode of the supply water temperature reducing chilled water can be adopted to the refrigerating capacity of target end-equipment of increasing supply, until temperature difference is in default temperature range.
Alternatively, the second control module comprises: second judges submodule, for judging whether current supply water temperature is less than or equal to supply water temperature lower limit; Second controls submodule, for judging to prescribe a time limit under current supply water temperature is less than or equal to supply water temperature, stop the supply water temperature reducing chilled water, and improve the output of chilled water when keeping current supply water temperature, until temperature difference is in default temperature range.
Because supply water temperature has lower limit, supply water temperature can not be reduced to when reduction supply water temperature and be less than supply water temperature lower limit.Supply water temperature lower limit such as 5 DEG C (usual supply water temperature is 7 DEG C), according to the model of air-conditioning system or environment for use different and change.If temperature difference can not be made to be in default temperature range by reducing supply water temperature, then increase output, increase the output of chilled water when less supply water temperature, also can increase T c, make T cget back to default temperature range.
Such as, the temperature that indoor return air wet-bulb temperature detects is 27 DEG C, and the temperature that air-supply wet-bulb temperature detects is 25 DEG C, temperature difference T cit is 2 DEG C.T sqcbe 3 DEG C, Δ T is 0.5 DEG C.Visible, T c< T sqc+ Δ T, then first reduce the supply water temperature of chilled water, makes temperature difference be in default temperature range, if the supply water temperature reducing chilled water cannot make temperature difference be in default temperature range, then increases the output of chilled water, thus make T cget back to default temperature range.Temperature difference T between real-time detection indoor return air wet-bulb temperature and air-supply wet-bulb temperature c, make T sqc-Δ T≤T c≤ T sqc+ Δ T.
In this embodiment, chilled water system may operate in the state of saving energy consumption, needing reduce the supply water temperature of chilled water system when increasing refrigerating capacity again and increase the output of chilled water, achieves dynamic adjustments supply water temperature and output.Compare with the mode of Non-follow control chilled water system when minimum load in maximum load with prior art, this embodiment is more accurate to the control of chilled water system, and regulates in real time according to the demand of target terminal, can better realize energy-conservation object.
In the above-described embodiments, can be regulated the water supply flow of chilled water by the running frequency controlling water pump, the running frequency reducing water pump reduces water supply flow, and the running frequency increasing water pump increases water supply flow.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed technology contents, the mode by other realizes.Wherein, device embodiment described above is only schematic, the such as division of described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the INDIRECT COUPLING of unit or module or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple unit.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, read-only storage (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (11)

1. the control method of chilled water system in air-conditioning, is characterized in that, comprising:
Detect the return air wet-bulb temperature of target end-equipment and the temperature difference of air-supply wet-bulb temperature;
Judge whether described temperature difference is in default temperature range;
When judging that described temperature difference is in described default temperature range, the running status maintaining described chilled water system is constant;
When judging that described temperature difference is not in described default temperature range, regulating output or the supply water temperature of described chilled water system, being in described default temperature range to make described temperature difference.
2. method according to claim 1, it is characterized in that, when judging that described temperature difference is not in described default temperature range, regulating output or the supply water temperature of described chilled water system, being in described default temperature range to make described temperature difference and comprising:
Judge whether described temperature difference is greater than the maximum of described default temperature range;
When judging that described temperature difference is greater than described maximum, reduce the output of described chilled water, until described temperature difference is in described default temperature range.
3. method according to claim 2, is characterized in that, reduces the output of described chilled water, comprises until described temperature difference is in described default temperature range:
Judge whether current output is less than or equal to output lower limit;
Judging to prescribe a time limit under described current output is less than or equal to described output, stop the output reducing described chilled water, and improve the supply water temperature of described chilled water when keeping described current output, until described temperature difference is in described default temperature range.
4. method according to claim 1, it is characterized in that, when judging that described temperature difference is not in described default temperature range, regulating output or the supply water temperature of described chilled water system, being in described default temperature range to make described temperature difference and comprising:
Judge whether described temperature difference is less than the minimum of a value of described default temperature range;
When judging that described temperature difference is less than described minimum of a value, reduce the supply water temperature of described chilled water, until described temperature difference is in described default temperature range.
5. method according to claim 4, is characterized in that, reduces the supply water temperature of described chilled water, comprises until described temperature difference is in described default temperature range:
Judge whether current supply water temperature is less than or equal to supply water temperature lower limit;
Judging to prescribe a time limit under described current supply water temperature is less than or equal to described supply water temperature, stop the supply water temperature reducing described chilled water, and improve the output of described chilled water when keeping described current supply water temperature, until described temperature difference is in described default temperature range.
6. method according to claim 1, is characterized in that, the temperature difference of the return air wet-bulb temperature and air-supply wet-bulb temperature that detect target end-equipment comprises:
Patrol and examine the aperture of the chilled water water valve of all end-equipments in described air-conditioning;
Search the water valve that described aperture is maximum;
Using end-equipment corresponding for water valve maximum for described aperture as described target end-equipment.
7. the control device of chilled water system in air-conditioning, is characterized in that, comprising:
Detecting unit, for detect target end-equipment return air wet-bulb temperature and air-supply wet-bulb temperature temperature difference;
Judging unit, for judging whether described temperature difference is in default temperature range;
Maintain unit, for when judging that described temperature difference is in described default temperature range, the running status maintaining described chilled water system is constant;
Regulon, for when judging that described temperature difference is not in described default temperature range, regulates output or the supply water temperature of described chilled water system, is in described default temperature range to make described temperature difference.
8. device according to claim 7, is characterized in that, described regulon comprises:
First judge module, for judging whether described temperature difference is greater than the maximum of described default temperature range;
First control module, for when judging that described temperature difference is greater than described maximum, reduces the output of described chilled water, until described temperature difference is in described default temperature range.
9. device according to claim 8, is characterized in that, described first control module comprises:
First judges submodule, for judging whether current output is less than or equal to output lower limit;
First controls submodule, for judging to prescribe a time limit under described current output is less than or equal to described output, stop the output reducing described chilled water, and improve the supply water temperature of described chilled water when keeping described current output, until described temperature difference is in described default temperature range.
10. device according to claim 7, is characterized in that, described regulon comprises:
Second judge module, for judging whether described temperature difference is less than the minimum of a value of described default temperature range;
Second control module, for when judging that described temperature difference is less than described minimum of a value, reduces the supply water temperature of described chilled water, until described temperature difference is in described default temperature range.
11. devices according to claim 10, is characterized in that, described second control module comprises:
Second judges submodule, for judging whether current supply water temperature is less than or equal to supply water temperature lower limit;
Second controls submodule, for judging to prescribe a time limit under described current supply water temperature is less than or equal to described supply water temperature, stop the supply water temperature reducing described chilled water, and improve the output of described chilled water when keeping described current supply water temperature, until described temperature difference is in described default temperature range.
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