CN114877421B - Air conditioner water system, control method and air conditioner unit - Google Patents

Air conditioner water system, control method and air conditioner unit Download PDF

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Publication number
CN114877421B
CN114877421B CN202210427032.4A CN202210427032A CN114877421B CN 114877421 B CN114877421 B CN 114877421B CN 202210427032 A CN202210427032 A CN 202210427032A CN 114877421 B CN114877421 B CN 114877421B
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water flow
water
flow
debugging
water pump
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CN114877421A (en
Inventor
林伟雪
杨芳
张海波
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Gree Electric Appliances Inc of Zhuhai
Zhuhai Gree Electrical and Mechanical Engineering Co Ltd
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Gree Electric Appliances Inc of Zhuhai
Zhuhai Gree Electrical and Mechanical Engineering Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/08—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with separate supply and return lines for hot and cold heat-exchange fluids i.e. so-called "4-conduit" system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F24F11/47—Responding to energy costs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/50—Load
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention discloses an air-conditioning water system, a control method and an air-conditioning unit, wherein the air-conditioning water system comprises: the main path assembly comprises at least one main path which is connected with a host and a host water pump in series, the tail end loop with the minimum hydraulic loss is used as a lift type selection basis of the host water pump, and the host flow of the main path where the host water pump is located is used as a flow type selection basis of the host water pump. The end loop is independently provided with end water pumps for controlling water flow, the end water pumps are connected with a controller provided with a storage module, the storage module stores debugging water flow of each end water pump under different debugging frequencies, the controller calculates running water flow according to load requirements of the end loop, obtains corresponding debugging frequencies from the storage module, and controls the running debugging frequencies of the end water pumps. The air-conditioning water system designed by the invention has the advantages of low cost, energy waste avoidance, timely and accurate control and the like.

Description

Air conditioner water system, control method and air conditioner unit
Technical Field
The invention relates to the technical field of air conditioning units, in particular to an air conditioning water system, a control method and an air conditioning unit.
Background
Fig. 1 shows a connection schematic diagram of a conventional air-conditioning water system, the system only sets host water pumps 2-1, 2-2 and 2-3 corresponding to the hosts 1-1, 1-2 and 1-3 in a main way, and after design is completed, hydraulic loss calculation is performed on the most unfavorable end loops, which are used as the basis of model selection of the host water pumps, and the resistances of the end loops are generally different, and balance valves 5-1, 5-2 and 5-3 are installed on each end loop for hydraulic balance of the end loops, so that the water flow of each end loop is regulated by regulating the opening of the valves. Because the host water pump selects the model according to the hydraulic loss of the least unfavorable end loop, for other loops, the water resistance needs to be increased to balance the water flow of each loop, and the energy waste is serious.
In addition, the air-conditioning water system mainly adopts a differential pressure bypass control method to control water flow, namely when load of the load side of the air-conditioning changes, balance valves 5-1, 5-2 and 5-3 on the tail end ring are used for adjusting opening degrees to change water flow flowing through the tail end ring, so that differential pressure exists between a water supply main pipe and a water return main pipe, further, a bypass regulating valve 6 on a bypass pipe is controlled through output signals of differential pressure controllers on the water supply main pipe and the water return main pipe, the opening degree of the bypass regulating valve 6 is regulated to bypass part of water flow, and when bypass water flow reaches the flow of one host water pump, the host water pump is started and stopped. For example: when the load demand of the tail end loop is reduced, the opening of a balance valve on the tail end loop is reduced, the pressure difference between a water supply main pipe and a water return main pipe is increased, the opening of a bypass regulating valve 6 is increased, and when the bypass water flow reaches the flow of a host water pump, the host water pump is closed. In the regulating mode, hysteresis exists in water pump control in the load change process, and the bypass of water flow also causes serious energy waste.
Disclosure of Invention
In order to solve the defects of high cost and energy waste of the existing air-conditioning water system, the invention provides the air-conditioning water system, the control method and the air-conditioning unit, and the air-conditioning water system has the advantages of low cost, energy waste avoidance, timely and accurate control and the like.
The invention adopts the technical scheme that the air conditioner water system is designed, and comprises: the main circuit component comprises at least one main circuit which is connected with a host and a host water pump in series, the tail end loop with the minimum hydraulic loss is used as a lift type selection basis of the host water pump, and the host flow of the main circuit where the host water pump is located is used as a flow type selection basis of the host water pump.
Preferably, the end loop is independently provided with an end water pump for controlling the water flow, the hydraulic loss of the end loop where the end water pump is positioned is used as the lift type selection basis of the end water pump, and the set flow of the end loop where the end water pump is positioned is used as the flow type selection basis of the end water pump.
Preferably, the end water pump of each end loop adjusts the frequency solely according to the load demand of the end loop in which it is located.
Preferably, the tail end water pumps are connected with a controller provided with a storage module, and the storage module stores the debugging water flow of each tail end water pump under different debugging frequencies; the controller calculates running water flow according to the load demand of the tail end loop, analyzes the running water flow and matches the debugging water flow, obtains the debugging frequency corresponding to the debugging water flow from the storage module, and controls the running debugging frequency of the tail end water pump of the tail end loop.
Preferably, the controller compares the running water flow with the minimum debugging water flow and the maximum debugging water flow; when the running water flow is smaller than the minimum debugging water flow, the minimum debugging water flow is taken to match the running water flow; when the running water flow is larger than the minimum debugging water flow and smaller than the maximum debugging water flow, searching two debugging water flows closest to the running water flow, and taking the maximum value of the two debugging water flows to match the running water flow; when the running water flow is greater than the maximum debugging water flow, the maximum debugging water flow is matched with the running water flow.
In some embodiments, the running water flow is calculated as: q=c·q m Deltat; wherein Q is the load demand of the end loop, c is the specific heat capacity of water, deltat is the set water inlet and outlet temperature difference of the end equipment, Q m To run water flow.
In some embodiments, the hydraulic loss calculation formula for the end loop is: hydraulic loss = end device resistance + on-way resistance + local resistance.
The invention also provides a control method for the air conditioner water system, which comprises the following steps:
the method comprises the steps of recording debugging water flow of each tail water pump under different debugging frequencies in advance, and establishing a comparison relation table of the debugging frequencies and the debugging water flow;
acquiring the load demand of a tail end loop where a tail end water pump is positioned, and calculating the running water flow;
analyzing the running water flow and matching the debugging water flow, and acquiring corresponding debugging frequency from a comparison relation table of the tail water pump according to the matched debugging water flow;
and controlling the running and debugging frequency of the tail water pump.
Preferably, analyzing the size of the running water flow and matching the debugging water flow includes:
two adjacent debugging water flows form an intermediate flow interval, a minimum flow interval is formed by less than the minimum debugging water flow, and a maximum flow interval is formed by more than the maximum debugging water flow;
when the running water flow is in any one middle flow interval, the maximum value of the middle flow interval is taken to match the running water flow;
when the running water flow is in the minimum flow interval, the maximum value of the minimum flow interval is taken to match the running water flow;
when the running water flow is in the maximum flow interval, the minimum value of the maximum flow interval is taken to match the running water flow.
The invention also provides an air conditioning unit which adopts the air conditioning water system.
Compared with the prior art, the invention has the following beneficial effects;
1. according to the terminal loop with the minimum hydraulic loss, the host water pump is selected, the model of the host water pump is reduced, and the system cost is reduced;
2. the tail end loop is independently provided with the tail end water pump, so that a balance valve is avoided, and energy waste is reduced;
3. and calculating running water flow according to the load demand of the tail end loop, controlling the tail end water pump according to the running water flow, and ensuring accurate and rapid regulation speed, so as to avoid energy waste by-pass.
Drawings
The invention is described in detail below with reference to examples and figures, wherein:
FIG. 1 is a schematic diagram of the connections of a prior art hollow water system;
FIG. 2 is a schematic diagram of the connection of the air-handling water system of the present invention;
FIG. 3 is a flow chart of the control method of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 2, the air-conditioning water system according to the present invention is applicable to an air-conditioning unit and the like, and the air-conditioning water system includes: the main circuit component and at least two end loops arranged in parallel are provided with end equipment 3, each end loop is connected with the main circuit component to form a circulation loop, the main circuit component comprises at least one main circuit which is connected with a host machine 1 and a host machine water pump 2 in series, the host machine 1 can be a refrigeration host machine or a heating host machine, the end equipment 3 is used as a cooling end when the refrigeration host machine works, and the end equipment 3 is used as a heating end when the heating host machine works. The key parameters of the water pump model selection are the lift and the flow, the end loop with the minimum hydraulic loss is used as the basis of the lift model selection of the host water pump 2, the flow of the host 1 of the main way where the host water pump 2 is positioned is used as the basis of the flow model selection of the host water pump 2, and the selected model of the host water pump 2 is small, so that the system cost is reduced.
On this basis, each end loop is independently provided with an end water pump 4 for controlling the water flow of the end water pump, a balance valve in the prior art is omitted, the water flow of a branch where the end water pump 4 is located is regulated, the water circulation power of the host water pump 2 is supplemented through the end water pump 4, the water circulation of the end loop is jointly driven by the end water pump 4 and the host water pump 2, and even if the model of the host water pump 2 is small, the water system can be ensured to reliably operate, and the energy waste caused by regulation of the balance valve is avoided. In order to reduce the system cost, the hydraulic loss of the end loop where the end water pump 4 is located is used as the model selection basis of the lift of the end water pump 4, the set flow of the end loop where the end water pump 4 is located is used as the model selection basis of the flow of the end water pump 4, and the set flow is a set value designed according to the use requirement of the end loop.
As shown in fig. 2, in the preferred embodiment of the present invention, the air conditioning water system includes a plurality of end loops, the main path assembly includes a plurality of main paths arranged in parallel, taking three end loops and three main paths as examples, three end devices 3 are 3-1, 3-2 and 3-3 respectively, corresponding end water pumps 4 are 4-1, 4-2 and 4-3 respectively, host 1 is 1-1, 1-2 and 1-3 respectively, corresponding host water pumps 2 are 2-1, 2-2 and 2-3 respectively, and one host or more than two hosts can be selectively started during actual use. When in actual use, the number of main ways of the main way assembly is designed according to the use requirement, the host machine 1 and the host machine water pump 2 are configured according to the rule of one machine and one pump, the number of the host machine water pump 2 which is started is consistent with the number of the host machine 1 which is started, the types of different host machines can be different, when the types of the host machines are different, the flow of the host machine water pump 2 is consistent with the flow of the corresponding host machine 1, the flow of the host machine 1 is obtained according to the model inquiry, and the lift of the host machine water pump 2 is an end loop which meets the minimum hydraulic loss.
Specifically, the hydraulic loss of the end loop is the resistance of the end loop, and the resistance includes the resistance of the end device 3, the on-way resistance and the local resistance, that is, the hydraulic loss of the end loop is calculated by the following formula: hydraulic loss = end device resistance + on-way resistance + local resistance.
The resistance of the end device 3 is a rated parameter, and the end device 3 is selected and then the corresponding resistance is searched according to the model. The resistance along the way or the local resistance is related to the water flow speed, the flow speed is too small, the pipe diameter is required to be increased when the water flow is fixed, the investment is increased, and a larger space is occupied; the flow speed is too high, the water flow resistance is increased, and the operation energy consumption is increased. Therefore, different pipe diameters have corresponding economic flow velocity ranges.
The calculation formula of the on-way resistance is as follows: deltaP ε The pipe diameters of different pipe sections of the loop can be determined according to the water flow and the economic flow rate, and the specific friction of the pipe section can be obtained according to the pipe diameters and the water flow, and the specific friction multiplied by the length of the pipe section is the on-way resistance of the pipe section.
The calculation formula of the local resistance is as follows:ζ is local resistance coefficient, local resistance coefficients of different valves and pipe fittings can be inquired, V is economic flow velocity, and g is gravitational acceleration.
The hydraulic loss calculation formulas given above are only illustrative, and any hydraulic loss calculation formulas (i.e. resistance calculation formulas) in different forms exist in the prior art, and the present invention is not limited thereto.
In the preferred embodiment of the invention, the end water pump 4 of each end loop independently adjusts the frequency according to the load requirement of the end loop where the end water pump is located, so that the water flow of the end loop is accurately adjusted in time to adapt to the current load requirement, and the cooling temperature or the heating temperature of the end equipment 3 is stable.
In order to realize intelligent control of the tail end water pumps 4, the tail end water pumps 4 are connected with a controller provided with a storage module, the storage module stores debugging water flows of each tail end water pump 4 under different debugging frequencies, the controller calculates running water flows according to load requirements of a tail end loop, analyzes the running water flows and matches the debugging water flows, and then obtains corresponding debugging frequencies from the storage module according to the matched debugging water flows and the tail end water pumps to control the running debugging frequencies of the tail end water pumps 4 of the tail end loop.
It should be understood that the data stored in the storage module is test data in the debugging stage of the air-conditioning water system, that is, before the air-conditioning water system is formally put into use, the debugging water flow of each tail end water pump 4 under different debugging frequencies is already stored in the storage module, and after the air-conditioning water system is formally put into use, the controller directly calls the data in the storage module. Of course, in practical application, a communication module for data interaction with the controller may be designed, and the data in the storage module may be modified and updated by the communication module, or the data in the storage module may be uploaded to the cloud end by the communication module.
Specifically, the calculation formula of the running water flow is: q=c·q m Deltat; wherein Q is the load demand of a terminal loop and the unit is KW; c is the specific heat capacity of water, 4.2 kJ/(kg)K) The method comprises the steps of carrying out a first treatment on the surface of the Deltat is the set water inlet and outlet temperature difference of the terminal equipment, and is determined by design and is national standard at 5 ℃; q m The unit is kg/h for running water flow. The above formula for calculating the running water flow is only illustrative, and a formula for calculating the running water flow according to the load demand in the prior art can be selected, which is not particularly limited in the present invention.
In some embodiments, the controller analyzes the size of the running water flow and matches the scheme of the debugging water flow as follows, the controller compares the running water flow with the minimum debugging water flow and the maximum debugging water flow, and when the running water flow is smaller than the minimum debugging water flow, the minimum debugging water flow is taken to match the running water flow; when the running water flow is larger than the minimum debugging water flow and smaller than the maximum debugging water flow, searching two debugging water flows closest to the running water flow, and taking the maximum value of the two debugging water flows to match the running water flow; when the running water flow is greater than the maximum debugging water flow, the maximum debugging water flow is matched with the running water flow.
For ease of understanding, the table below shows a table of the relationship between one of the end pumps and the matching results.
Frequency of f 0 f 1 f 2 f 3 .... f n
Debugging water flow V 0 V 1 V 2 V 3 .... V n
Running water flow V≤V 0 V 0 ＜V≤V 1 V 1 ＜V≤V 2 V 2 ＜V≤V 3 .... V＞V n-1
F in Table 0 For the lowest operable frequency of the water pump, f n The highest frequency can be operated for the water pump. In the debugging process after the air-conditioning water system is installed, the debugging water flow of each tail end water pump 4 under different frequencies is recorded and stored in a storage module of the controller. When the air-conditioning water system is started to operate, corresponding running water flow is automatically calculated according to the load demand of the tail end loop, the debugging flow of the corresponding tail end water pump 4 in the storage module is inquired and compared, and when the running water flow V is less than or equal to V 0 At the time, take V 0 Matching the running water flow, the end water pump 4 of the end loop adjusts the running frequency to f 0 When running water flow V 0 ＜V≤V 1 When the two debugging water flows closest to the running water flow are found to be V respectively 0 And V 1 Taking V 0 And V 1 Maximum value V of (a) 1 Matching the running water flow, the end water of the end loopThe pump 4 adjusts the operating frequency to f 1 Similarly, when the running water flow V is greater than V n-1 At the time, take V n-1 Matching the running water flow, the end water pump 4 of the end loop adjusts the running frequency to f n Thereby controlling the operating frequency of the end water pump 4.
The controller can find out the optimal operating frequency meeting the load demand according to the matching logic, and the energy waste caused by the overlarge operating frequency and the temperature fluctuation of the tail end equipment 3 caused by the overlarge operating frequency are prevented. It should be understood that "maximum commissioned water flow rate" refers to the maximum value of all commissioned water flow rates of the current end water pump 4, and "minimum commissioned water flow rate" refers to the minimum value of all commissioned water flow rates of the current end water pump 4.
As shown in fig. 3, the present invention further provides a control method for the air-conditioning water system, including:
debugging an air-conditioning water system in advance, recording the debugging water flow of each tail water pump 4 under different debugging frequencies, and establishing a comparison relation table of the debugging frequencies and the debugging water flow;
when the air-conditioning water system is started to operate, acquiring the load demand of a tail end loop where the tail end water pump 4 is positioned, and calculating the running water flow;
analyzing the running water flow and matching the debugging water flow, and acquiring corresponding debugging frequency from a comparison relation table of the tail water pump 4 according to the matched debugging water flow;
and controlling the running debugging frequency of the tail end water pump 4.
It should be understood that after the air-conditioning water system is started to operate, the operating water flow can be calculated according to the load demand when the load demand of the end loop is changed, or the operating water flow can be calculated according to the load demand by acquiring the load demand of the end loop at intervals.
In the control method, the control flow after the air-conditioning water system is started and operated is executed by the controller, the comparison relation table is stored in the storage module of the controller, the load demand generally refers to the cold load demand, the control method is also applicable to the water pump adjustment control under the heat load demand in actual application, the control logic of the cold load demand and the control logic of the heat load demand are basically the same, the operation water flow is calculated according to the load demand, and then the corresponding debugging frequency is obtained from the comparison relation table according to the operation water flow, so that the operation debugging frequency of the tail-end water pump 4 is controlled.
Compared with the differential pressure bypass control method in the prior art, the control method has the advantages that each end loop is provided with the independent end water pump, the running water flow is directly calculated and controlled according to the load demand, the response is more timely, the control is more accurate, the bypass of chilled water when the load demand is reduced is avoided, and the energy waste is avoided.
In some possible embodiments of the invention, analyzing the magnitude of the running water flow and matching the commissioning water flow includes:
two adjacent debugging water flows form an intermediate flow interval, a minimum flow interval is formed by less than the minimum debugging water flow, and a maximum flow interval is formed by more than the maximum debugging water flow;
when the running water flow is in any one middle flow interval, the maximum value of the middle flow interval is taken to match the running water flow;
when the running water flow is in the minimum flow interval, the maximum value of the minimum flow interval is taken to match the running water flow;
when the running water flow is in the maximum flow interval, the minimum value of the maximum flow interval is taken to match the running water flow.
The matching scheme designed by the invention has the advantages that the optimal operation frequency meeting the load requirement can be found, and the energy waste caused by the overlarge operation frequency and the temperature fluctuation of the terminal equipment caused by the overlarge operation frequency are prevented.
For ease of understanding, the table below shows a table of the relationship between one of the end pumps and the matching results.
Frequency of f 0 f 1 f 2 f 3 .... f n
Debugging water flow V 0 V 1 V 2 V 3 .... V n
Running water flow V≤V 0 V 0 ＜V≤V 1 V 1 ＜V≤V 2 V 2 ＜V≤V 3 .... V＞V n-1
F in Table 0 For the lowest operable frequency of the water pump, f n The highest frequency can be operated for the water pump. When the running water flow V is less than or equal to V 0 At the time, take V 0 Matching the running water flow, the end water pump 4 of the end loop adjusts the running frequency to f 0 When running water flow V 0 ＜V≤V 1 At the time, the maximum value V of the interval is taken 1 Matching the running water flow, the end water pump 4 of the end loop adjusts the running frequency to f 1 Similarly, when the running water flow V is greater than V n-1 At the time, take V n-1 Matching the running water flow, the end water pump 4 of the end loop adjusts the running frequency to f n Thereby controlling the operating frequency of the end water pump 4.
It should be noted that, because each end water pump 4 establishes a comparison relation table, in the process of analyzing the running water flow and matching the debugging water flow, the comparison relation table of the end water pump 4 is found first, and then the corresponding debugging frequency is obtained from the comparison relation table according to the matching debugging water flow.
The matching logic provided by the control method can find out the optimal operating frequency meeting the load demand, and the energy waste caused by the overlarge operating frequency and the temperature fluctuation of the tail end equipment 3 caused by the overlarge operating frequency are prevented. The "maximum debugging water flow" refers to the maximum value of all debugging water flows in the comparison table of the tail end water pump 4, and the "minimum debugging water flow" refers to the minimum value of all debugging water flows in the comparison table of the tail end water pump 4.
Although some terms are used more herein, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the nature of the invention and should be construed in a manner consistent with their spirit and scope.
The specific embodiments described herein are offered by way of example only. Those skilled in the art to which the invention pertains may make modifications or additions to the described embodiments or substitutions in a similar manner without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (9)

1. An air conditioning water system comprising: the system comprises a main circuit assembly and at least two tail end loops arranged in parallel, wherein each tail end loop is connected with the main circuit assembly to form a circulation loop, and the main circuit assembly comprises at least one main circuit which is connected with a host and a host water pump in series; the method is characterized in that a tail end loop with the minimum hydraulic loss is used as a lift type selection basis of the host water pump, and the host flow of a main way where the host water pump is positioned is used as a flow type selection basis of the host water pump;
the tail end loop is independently provided with a tail end water pump for controlling the water flow, the hydraulic loss of the tail end loop where the tail end water pump is located is used as the type selection basis of the lift of the tail end water pump, and the set flow of the tail end loop where the tail end water pump is located is used as the type selection basis of the flow of the tail end water pump.
2. The air-conditioning water system of claim 1, wherein the end water pump of each of said end loops individually adjusts frequency according to the load demand of the end loop in which it is located.
3. The air conditioning water system of claim 2, wherein the end water pumps are connected to a controller having a storage module that stores the conditioned water flow rate for each end water pump at different conditioned frequencies;
the controller calculates running water flow according to the load demand of the tail end loop, analyzes the running water flow and matches debugging water flow, obtains debugging frequency corresponding to the debugging water flow from the storage module, and controls the tail end water pump of the tail end loop to run the debugging frequency.
4. An air conditioning water system according to claim 3, wherein the controller compares the running water flow rate to a minimum commissioning water flow rate, a maximum commissioning water flow rate;
when the running water flow is smaller than the minimum debugging water flow, taking the minimum debugging water flow to match the running water flow;
when the running water flow is larger than the minimum debugging water flow and smaller than the maximum debugging water flow, searching two debugging water flows closest to the running water flow, and taking the maximum value of the two debugging water flows to be matched with the running water flow;
when the running water flow is larger than the maximum debugging water flow, the maximum debugging water flow is taken to match with the running water flow.
5. An air conditioning water system according to claim 3, wherein the operational water flow is calculated as: q=c·q m Δt; wherein Q is the load demand of the end loop, c is the specific heat capacity of water, deltat is the set water inlet and outlet temperature difference of the end equipment, Q m To run water flow.
6. The air conditioning water system of claim 1, wherein the hydraulic loss calculation formula for the end loop is: hydraulic loss = end device resistance + on-way resistance + local resistance.
7. A control method for an air-conditioning water system according to any one of claims 1 to 6, comprising:
the method comprises the steps of recording debugging water flow of each tail water pump under different debugging frequencies in advance, and establishing a comparison relation table of the debugging frequencies and the debugging water flow;
acquiring the load demand of a tail end loop where the tail end water pump is positioned, and calculating the running water flow;
analyzing the running water flow and matching the debugging water flow, and acquiring corresponding debugging frequency from a comparison relation table of the tail end water pump according to the matched debugging water flow;
and controlling the tail end water pump to operate the debugging frequency.
8. The control method of claim 7, wherein analyzing the magnitude of the running water flow and matching the commissioning water flow comprises:
two adjacent debugging water flows form an intermediate flow interval, a minimum flow interval is formed by less than the minimum debugging water flow, and a maximum flow interval is formed by more than the maximum debugging water flow;
when the running water flow is in any one of the intermediate flow intervals, the maximum value of the intermediate flow interval is taken to match with the running water flow;
when the running water flow is in a minimum flow interval, taking the maximum value of the minimum flow interval to match the running water flow;
and when the running water flow is in the maximum flow interval, taking the minimum value of the maximum flow interval to match the running water flow.
9. An air conditioning unit, characterized in that the air conditioning unit employs the air conditioning water system according to any one of claims 1 to 6.
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