CN114877421A - Air conditioning water system, control method and air conditioning unit - Google Patents
Air conditioning water system, control method and air conditioning unit Download PDFInfo
- Publication number
- CN114877421A CN114877421A CN202210427032.4A CN202210427032A CN114877421A CN 114877421 A CN114877421 A CN 114877421A CN 202210427032 A CN202210427032 A CN 202210427032A CN 114877421 A CN114877421 A CN 114877421A
- Authority
- CN
- China
- Prior art keywords
- water
- water flow
- flow
- debugging
- water pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
Landscapes
- 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 circuit component comprises at least one main circuit which is connected with a main machine and a main machine water pump in series, the tail end loop with the minimum hydraulic loss is used as a lift model selection basis of the main machine water pump, and the main machine flow of the main circuit where the main machine water pump is located is used as a flow model selection basis of the main machine water pump. The tail end loop is independently provided with a tail end water pump for controlling water flow, the tail end water pump is connected with a controller with a storage module, the storage module stores debugging water flow of each tail end water pump under different debugging frequencies, the controller calculates running water flow according to load requirements of the tail end loop, corresponding debugging frequencies are obtained from the storage module, and running debugging frequencies of the tail end water pump are controlled. 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
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 an existing air-conditioning water system, the system is provided with main machine water pumps 2-1, 2-2 and 2-3 corresponding to main machines 1-1, 1-2 and 1-3 only in a main path, hydraulic loss calculation is carried out on the most unfavorable end loop after design is completed, the hydraulic loss calculation is used as a basis for main machine water pump type selection, resistance of the end loop is usually different, for hydraulic balance of each end loop, a balance valve 5-1, 5-2 and 5-3 is installed on each end loop, and water flow of each end loop is adjusted by adjusting the opening degree of a valve. Because the host computer water pump is according to the hydraulic loss selection type of the most unfavorable end loop, this for other loops, need increase the water resistance in order to balance each loop discharge, cause the energy waste serious.
In addition, the air-conditioning water system mostly adopts a differential pressure bypass control method to control water flow, namely when the load on the load side of the air conditioner changes, the balance valves 5-1, 5-2 and 5-3 on the tail end loop adjust the opening degree to change the water flow flowing through the tail end loop, so that the water supply main pipe and the water return main pipe have differential pressure, then the signals are output by the differential pressure controllers on the water supply main pipe and the water return main pipe to control the bypass adjusting valve 6 on the bypass pipe, the opening degree of the bypass adjusting valve 6 is adjusted to bypass partial water flow, and when the bypass water flow reaches the flow of one main machine water pump, the main machine water pump is started and stopped. For example: when the load demand of the tail end loop is reduced, the opening degree of a balance valve on the tail end loop is adjusted to be small, the pressure difference of a water supply main pipe and a water return main pipe is increased, the opening degree of a bypass adjusting valve 6 is increased, and when the flow rate of bypass water reaches the flow rate of a host water pump, the host water pump is closed. In the process of load change, the water pump control has hysteresis, and the bypass of water flow also causes serious energy waste.
Disclosure of Invention
In order to overcome 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.
The technical scheme adopted by the invention is that an air conditioning water system is designed, and the air conditioning water system comprises: the main path component comprises at least one main path which is connected with a main machine and a main machine water pump in series, the tail end loop with the minimum hydraulic loss is used as a lift model selection basis of the main machine water pump, and the main machine flow of the main path where the main machine water pump is located is used as a flow model selection basis of the main machine water pump.
Preferably, the tail end loop is separately 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 a lift model selection basis 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 a flow model selection basis of the tail end water pump.
Preferably, the end water pump of each end loop independently adjusts the frequency according to the load requirements of the end loop in which it is located.
Preferably, the tail end water pump is connected with a controller 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 the operation water flow according to the load requirement of the tail end loop, analyzes the size of the operation 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 tail end water pump operation debugging frequency 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, matching the minimum debugging water flow with the running water flow; when the operation 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 operation water flow, and taking the maximum value of the two debugging water flows to match the operation water flow; and when the running water flow is larger than the maximum debugging water flow, the maximum debugging water flow is taken to match the running water flow.
In some embodiments, the operating water flow is calculated by the formula: q is c.q m Δ t; wherein Q is the load requirement of the tail end loop, c is the specific heat capacity of water, delta t is the set water inlet and outlet temperature difference of the tail end equipment, and Q m To run water flow.
In some embodiments, the hydraulic loss of the end loop is calculated by the formula: hydraulic loss is the terminal equipment resistance + on-way resistance + local resistance.
The invention also provides a control method for the air-conditioning water system, which comprises the following steps:
recording the debugging water flow of each tail end water pump under different debugging frequencies in advance, and establishing a comparison relation table of the debugging frequencies and the debugging water flow;
acquiring load requirements of a tail end loop where a tail end water pump is located and calculating running water flow;
analyzing the magnitude of the running water flow, 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 running debugging frequency of the tail end water pump.
Preferably, analyzing the magnitude of the operating water flow and matching the commissioning water flow comprises:
two adjacent debugging water flows in size form an intermediate flow interval, the debugging water flow smaller than the minimum forms a minimum flow interval, and the debugging water flow larger than the maximum forms a maximum flow interval;
when the operation water flow is in any one intermediate flow interval, taking the maximum value of the intermediate flow interval to match the operation water flow;
when the operation water flow is in the minimum flow interval, taking the maximum value of the minimum flow interval to match the operation water flow;
and when the operation water flow is in the maximum flow interval, matching the minimum value of the maximum flow interval with the operation water flow.
The invention further 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. the host water pump is selected according to the tail end loop with the minimum hydraulic loss, the model of the host water pump is reduced, and the system cost is reduced;
2. a tail end loop is independently provided with a tail end water pump, so that a balance valve is avoided, and energy waste is reduced;
3. the operation water flow is calculated according to the load requirement of the tail end loop, the tail end water pump is controlled according to the operation water flow, the adjusting speed is accurate and fast, and energy waste caused by bypass is avoided.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of the connection of a prior art air conditioning system;
FIG. 2 is a schematic diagram of the connection of the air conditioning water system of the present invention;
fig. 3 is a flow chart illustrating a control method according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present 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 merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 2, the air conditioning water system provided by the invention is suitable for air conditioning units and the like, and comprises: the main road component comprises at least one main road which is connected with a main machine 1 and a main machine water pump 2 in series, the main machine 1 can be a refrigerating main machine or a heating main machine, the end equipment 3 serves as a cooling end when the refrigerating main machine works, and the end equipment 3 serves as a heating end when the heating main machine works. The key parameters of the water pump model selection are lift and flow, the tail end loop with the minimum hydraulic loss is used as the lift model selection basis of the main machine water pump 2, the flow of the main machine 1 of the main road where the main machine water pump 2 is located is used as the flow model selection basis of the main machine water pump 2, the model of the selected main machine water pump 2 is small, and the system cost is reduced.
On this basis, every terminal loop disposes terminal water pump 4 of its discharge of control alone, the balanced valve among the prior art has been cancelled, the discharge of its place branch road is adjusted through terminal water pump 4, supply the hydrologic cycle power of host computer water pump 2 through terminal water pump 4, drive the hydrologic cycle of terminal loop jointly by terminal water pump 4 and host computer water pump 2, even if 2 models of host computer water pump are little, also can ensure the reliable operation of water system equally, avoid the balanced valve to adjust the energy waste that appears. 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 basis for the head selection of the end water pump 4, and the set flow rate of the end loop where the end water pump 4 is located is used as the basis for the flow rate selection of the end water pump 4, wherein the set flow rate is a set value designed according to the use requirement of the end loop.
As shown in fig. 2, in a preferred embodiment of the present invention, the air-conditioning water system includes a plurality of end loops, the main path component 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, corresponding end water pumps 4 are 4-1, 4-2, and 4-3, respectively, the main machines 1 are 1-1, 1-2, and 1-3, and corresponding main machine water pumps 2 are 2-1, 2-2, and 2-3, respectively, and one or more than two main machines can be selectively turned on in actual use. During the in-service use, the main road quantity of main road subassembly is designed according to the use needs, host computer 1 and host computer water pump 2 are according to the regular configuration of a machine pump, the number of opening of host computer water pump 2 keeps unanimous with the number of opening of host computer 1, the model of different host computers can be different, when the host computer model is different, the flow of host computer water pump 2 is unanimous with its flow that corresponds host computer 1, the flow of host computer 1 is obtained according to its model inquiry, the lift of host computer water pump 2 is for satisfying the minimum terminal loop of 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 formula: hydraulic loss is the terminal equipment resistance + on-way resistance + local resistance.
The resistance of the end equipment 3 is a rated parameter, and the corresponding resistance is searched according to the model of the selected end equipment 3. Both the on-way resistance and the local resistance are related to the water flow speed, the flow speed is too small, the pipe diameter needs to be enlarged when the water flow is constant, the investment is increased, and a larger space is occupied; the flow velocity is overlarge, the water flow resistance is increased, and the operation energy consumption is increased. Thus, there are corresponding economic flow rate ranges for different pipe diameters.
The on-way resistance is calculated by the formula: delta P ε The pipe diameters of different pipe sections of the loop can be determined according to the water flow and the economic flow rate, the specific friction resistance of the pipe section can be obtained through inquiring according to the pipe diameters and the water flow, and the on-way resistance of the pipe section is obtained by multiplying the specific friction resistance by the length of the pipe section.
The calculation formula of the local resistance is as follows:
zeta is the local resistance coefficient, the local resistance coefficients of different valves and pipe fittings can be inquired, V is the economic flow rate, and g is the gravitational acceleration.
The hydraulic loss calculation formula given above is only an example, and there are different forms of hydraulic loss calculation formulas (i.e., resistance calculation formulas) in the prior art, and any one of them may be selected, and the present invention is not particularly limited thereto.
In the preferred embodiment of the present 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 as to adjust the water flow of the end loop accurately 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 the intelligent control of the tail end water pump 4, the tail end water pump 4 is connected with a controller with a storage module, the storage module stores the debugging water flow of each tail end water pump 4 under different debugging frequencies, the controller calculates the running water flow according to the load requirement of a tail end loop, analyzes the size of the running water flow and matches the debugging water flow, and then the controller acquires the corresponding debugging frequency from the storage module according to the matched debugging water flow and the tail end water pump and controls the running debugging frequency of the tail end water pump 4 of the tail end loop.
It should be understood that the data stored in the storage module is test data at the commissioning stage of the air-conditioning water system, that is, the commissioning water flow rate of each end water pump 4 at different commissioning frequencies is already stored in the storage module before the air-conditioning water system is put into actual use, and after the air-conditioning water system is put into actual use, the controller directly calls the data in the storage module. Certainly, in practical application, a communication module interacting with the controller data may be designed, and the data in the storage module may be modified and updated through the communication module, or the data in the storage module may be uploaded to the cloud end through the communication module.
Specifically, the calculation formula of the operation water flow is as follows: q is c.q m Δ t; wherein Q is the load demand of the tail end loop, and the unit is KW; c is the specific heat capacity of water, 4.2 kJ/(kg. multidot.K); delta t is the set water inlet and outlet temperature difference of the tail end equipment, is determined by design and has the national standard of 5 ℃; q. q.s m Is the running water flow rate and the unit is kg/h. The above-mentioned calculation formula of the operation water flow is only an example, and a formula for calculating the operation water flow based on the load demand in the prior art may also be selected, which is not limited by the present invention.
In some embodiments, the controller analyzes the magnitude of the running water flow and matches the debugging water flow as follows, the controller compares the running water flow with a minimum debugging water flow and a maximum debugging water flow, and when the running water flow is smaller than the minimum debugging water flow, the minimum debugging water flow is selected to match the running water flow; when the operation 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 operation water flow, and taking the maximum value of the two debugging water flows to match the operation water flow; and when the running water flow is larger than the maximum debugging water flow, the maximum debugging water flow is taken to match the running water flow.
For ease of understanding, the following table shows a comparison table of one of the end pumps and the matching results.
| Frequency of | f 0 | f 1 | f 2 | f 3 | .... | f n |
| Regulating water flow | V 0 | V 1 | V 2 | V 3 | .... | V n |
| Flow rate of running water | V≤V 0 | V 0 ＜V≤V 1 | V 1 ＜V≤V 2 | V 2 ＜V≤V 3 | .... | V＞V n-1 |
In table f 0 Lowest frequency for the water pump to operate, f n The highest frequency is available for the water pump. And recording the debugging water flow of each tail end water pump 4 under different frequencies in the debugging process after the air conditioner water system is installed, and storing the debugging water flow in a storage module of the controller. When the air-conditioning water system is started to operate, corresponding operation water flow is automatically calculated according to the load requirement of the tail end loop, debugging flow of the corresponding tail end water pump 4 in the storage module is inquired and compared, and when the operation water flow V is less than or equal to V, V 0 When it is, get V 0 Matching the operating water flow rate, the end water pump 4 of the end loop adjusting the operating frequency to f 0 When the running water flow V is 0 ＜V≤V 1 Then, two debugging water flows which are the closest to the running water flow and are respectively found to be V 0 And V 1 Get V 0 And V 1 Maximum value of V 1 Matching the operating water flow rate, the end water pump 4 of the end loop adjusting the operating frequency to f 1 By analogy, when the running water flow V is more than V n-1 When taking V n-1 Matching the operating water flow rate, the end water pump 4 of the end loop adjusting the operating frequency to f n Thereby controlling the operating frequency of the tail end water pump 4.
The controller can find out the optimal operating frequency meeting the load requirement according to the matching logic, and energy waste caused by overlarge operating frequency and temperature fluctuation of the terminal equipment 3 caused by undersize operating frequency are prevented. It should be understood that "maximum commissioning water flow" refers to the maximum value of all commissioning water flows of the current tip water pump 4, and "minimum commissioning water flow" refers to the minimum value of all commissioning water flows of the current tip water pump 4.
As shown in fig. 3, the present invention also 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 end 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 located and calculating the operation water flow;
analyzing the magnitude of the running water flow, matching the debugging water flow, and acquiring corresponding debugging frequency from a comparison relation table of the tail end water pump 4 according to the matched debugging water flow;
and controlling the tail end water pump 4 to run at a debugging frequency.
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 tail end loop changes, or the operating water flow can be calculated according to the load demand by acquiring the load demand of the tail end loop at intervals.
In the control method, the control flow after the air-conditioning water system is started to operate is executed by the controller, the comparison relation table is stored in a storage module of the controller, the load demand generally refers to the cold load demand, the control method is also suitable for water pump regulation control under the heat load demand in actual application, the control logics of the cold load demand and the heat load demand are basically the same, the operation water flow is calculated according to the load demand, the corresponding debugging frequency is obtained from the comparison relation table according to the operation water flow, and 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, each end loop is provided with an 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 chilled water bypass is avoided when the load demand is reduced, and the energy waste is avoided.
In some possible embodiments of the invention, analyzing the size of the operating water flow and matching the commissioning water flow comprises:
two adjacent debugging water flows in size form an intermediate flow interval, the debugging water flow smaller than the minimum forms a minimum flow interval, and the debugging water flow larger than the maximum forms a maximum flow interval;
when the operation water flow is in any one intermediate flow interval, taking the maximum value of the intermediate flow interval to match the operation water flow;
when the operation water flow is in the minimum flow interval, taking the maximum value of the minimum flow interval to match the operation water flow;
and when the operation water flow is in the maximum flow interval, matching the minimum value of the maximum flow interval with the operation water flow.
The matching scheme designed by the invention has the advantages that the optimal running frequency meeting the load requirement can be found out, and energy waste caused by overlarge running frequency and temperature fluctuation of the terminal equipment caused by undersize running frequency are prevented.
For ease of understanding, the following table shows a comparison table of one of the end pumps and the matching results.
| Frequency of | f 0 | f 1 | f 2 | f 3 | .... | f n |
| Regulating water flow | V 0 | V 1 | V 2 | V 3 | .... | V n |
| Flow rate of running water | V≤V 0 | V 0 ＜V≤V 1 | V 1 ＜V≤V 2 | V 2 ＜V≤V 3 | .... | V＞V n-1 |
In table f 0 Lowest frequency for the water pump to operate, f n The highest frequency is available for the water pump. When the running water flow V is less than or equal to V 0 When it is, get V 0 Matching the operating water flow rate, the end water pump 4 of the end loop adjusting the operating frequency to f 0 When the running water flow V is 0 ＜V≤V 1 Taking the maximum value V of the interval 1 Matching the operating water flow rate, the end water pump 4 of the end loop adjusting the operating frequency to f 1 By analogy, when the running water flow V is more than V n-1 When it is, get V n-1 Matching the operating water flow rate, the end water pump 4 of the end loop adjusting the operating frequency to f n Thereby controlling the operating frequency of the tail end water pump 4.
It should be noted that, because each end water pump 4 is established with a comparison table, in the process of analyzing the magnitude of the operating water flow and matching and debugging the water flow, the comparison table of the end water pump 4 is found first, and then the corresponding debugging frequency is obtained from the comparison table according to the matching and debugging water flow.
The matching logic given by the control method can find out the optimal operating frequency meeting the load requirement, and prevent energy waste caused by overlarge operating frequency and temperature fluctuation of the terminal equipment 3 caused by undersize operating frequency. The "maximum adjusted water flow rate" refers to a maximum value of all adjusted water flows in the comparison table of the end water pump 4, and the "minimum adjusted water flow rate" refers to a minimum value of all adjusted water flows in the comparison table of the end water pump 4.
Although some terms are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as any additional limitation which is not in accordance with the spirit of the present invention.
The specific embodiments described herein are merely illustrative of the invention. Those skilled in the art to which the invention relates may modify, supplement or substitute the specific embodiments described, without however departing from the spirit of the invention or exceeding the scope defined by the appended claims.
Claims (10)
1. An air conditioning water system comprising: the main path component comprises at least one main path which is connected with a main machine and a main machine water pump in series; the method is characterized in that a tail end loop with the minimum hydraulic loss is used as a head model selection basis of the main machine water pump, and the main machine flow of a main machine path where the main machine water pump is located is used as a flow model selection basis of the main machine water pump.
2. The air-conditioning water system according to claim 1, wherein the end loop is separately provided with an end water pump for controlling a water flow rate thereof, a hydraulic loss of the end loop in which the end water pump is located is used as a lift-selecting basis of the end water pump, and a set flow rate of the end loop in which the end water pump is located is used as a flow-selecting basis of the end water pump.
3. An air-conditioning water system as recited in claim 2, wherein the terminal water pump of each of said terminal loops is independently frequency modulated in response to the load requirements of the terminal loop in which it is located.
4. An air conditioning water system as claimed in claim 3, wherein the terminal water pump is connected to a controller having a storage module that stores a commissioning water flow rate for each terminal water pump at a different commissioning frequency;
the controller calculates the operation water flow according to the load requirement of the tail end loop, analyzes the size of the operation water flow and matches with the debugging water flow, acquires the 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 operate the debugging frequency.
5. An air conditioning water system as claimed in claim 4, wherein the controller compares the operating water flow with a minimum commissioning water flow, a maximum commissioning water flow;
when the running water flow is smaller than the minimum debugging water flow, matching the minimum debugging water flow with 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;
and 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.
6. An air conditioning water system as claimed in claim 4, wherein the operating water flow is calculated by the formula:
(ii) a Wherein Q is the load requirement of the tail end loop, c is the specific heat capacity of water, delta t is the set water inlet and outlet temperature difference of the tail end equipment, and Q m To run water flow.
7. An air-conditioning water system according to claim 1 or 2, wherein the hydraulic loss calculation formula of the terminal loop is: hydraulic loss = end device resistance + on-way resistance + local resistance.
8. A control method for an air conditioning water system as claimed in any one of claims 2 to 4, comprising:
recording the debugging water flow of each tail end water pump under different debugging frequencies in advance, and establishing a comparison relation table of the debugging frequencies and the debugging water flow;
acquiring load requirements of a tail end loop where the tail end water pump is located, and calculating running water flow;
analyzing the magnitude of the running water flow, 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.
9. The control method of claim 8, wherein analyzing the magnitude of the operating water flow and matching a commissioning water flow comprises:
two adjacent debugging water flows in size form an intermediate flow interval, the debugging water flow smaller than the minimum forms a minimum flow interval, and the debugging water flow larger than the maximum forms a maximum flow interval;
when the operation water flow is in any one intermediate flow interval, taking the maximum value of the intermediate flow interval to match with the operation water flow;
when the operation water flow is in a minimum flow interval, taking the maximum value of the minimum flow interval to match with the operation water flow;
and when the operation water flow is in a maximum flow interval, taking the minimum value of the maximum flow interval to match with the operation water flow.
10. Air conditioning assembly, characterized in that it employs the air-conditioned water system of any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210427032.4A CN114877421B (en) | 2022-04-21 | 2022-04-21 | Air conditioner water system, control method and air conditioner unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210427032.4A CN114877421B (en) | 2022-04-21 | 2022-04-21 | Air conditioner water system, control method and air conditioner unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114877421A true CN114877421A (en) | 2022-08-09 |
| CN114877421B CN114877421B (en) | 2023-08-29 |
Family
ID=82672214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210427032.4A Active CN114877421B (en) | 2022-04-21 | 2022-04-21 | Air conditioner water system, control method and air conditioner unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114877421B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782260A (en) * | 2010-01-22 | 2010-07-21 | 华中科技大学 | Optimal control method and device for water system of air conditioning |
| US20120055665A1 (en) * | 2009-02-13 | 2012-03-08 | Toshiba Carrier Corporation | Secondary pump type heat source and secondary pump type heat source control method |
| CN105221385A (en) * | 2015-10-22 | 2016-01-06 | 广州市设计院 | Air-conditioning system different lift different flow Combined water pump structure and controlling method |
| US20160109145A1 (en) * | 2014-10-16 | 2016-04-21 | Alliance Environmental Technology Limited | Air conditioner energy-saving optimization control method and device |
| CN206377791U (en) * | 2017-01-11 | 2017-08-04 | 奥意建筑工程设计有限公司 | A kind of central air-conditioning two stage pump air-conditioner water system |
| JP2018004097A (en) * | 2016-06-27 | 2018-01-11 | 荏原冷熱システム株式会社 | Heat source system and control method thereof |
| JP2018128211A (en) * | 2017-02-10 | 2018-08-16 | 日立ジョンソンコントロールズ空調株式会社 | Refrigeration system |
-
2022
- 2022-04-21 CN CN202210427032.4A patent/CN114877421B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120055665A1 (en) * | 2009-02-13 | 2012-03-08 | Toshiba Carrier Corporation | Secondary pump type heat source and secondary pump type heat source control method |
| CN101782260A (en) * | 2010-01-22 | 2010-07-21 | 华中科技大学 | Optimal control method and device for water system of air conditioning |
| US20160109145A1 (en) * | 2014-10-16 | 2016-04-21 | Alliance Environmental Technology Limited | Air conditioner energy-saving optimization control method and device |
| CN105221385A (en) * | 2015-10-22 | 2016-01-06 | 广州市设计院 | Air-conditioning system different lift different flow Combined water pump structure and controlling method |
| JP2018004097A (en) * | 2016-06-27 | 2018-01-11 | 荏原冷熱システム株式会社 | Heat source system and control method thereof |
| CN206377791U (en) * | 2017-01-11 | 2017-08-04 | 奥意建筑工程设计有限公司 | A kind of central air-conditioning two stage pump air-conditioner water system |
| JP2018128211A (en) * | 2017-02-10 | 2018-08-16 | 日立ジョンソンコントロールズ空調株式会社 | Refrigeration system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114877421B (en) | 2023-08-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110392515B (en) | Historical data-based cold and heat source machine room energy-saving control method and system | |
| CN105674472B (en) | The refrigeration control method and device of computer room | |
| CN106766302B (en) | Water chilling unit and control method thereof | |
| CN101539355B (en) | Refrigeration control system capable of intelligent scheduling and method thereof | |
| CN102094801A (en) | Method for optimizing pumping set based on minimum conveying energy consumption | |
| CN113701321B (en) | Energy-saving frequency conversion control method for central air-conditioning water pump | |
| CN114576806A (en) | Central air-conditioning cooling water system energy-saving optimization method based on variable frequency control | |
| CN211551977U (en) | Intelligent control variable frequency regulating system for air conditioner circulating water pump | |
| CN2460899Y (en) | One-with-multiple heat pump equipment with variable refrigerating output and heating output | |
| CN113606693A (en) | Data center refrigerating system and air-water coupling energy-saving control method thereof | |
| CN111089371A (en) | Electronic factory building cold source station control system and control method thereof | |
| CN206488498U (en) | A kind of handpiece Water Chilling Units | |
| CN203274139U (en) | Intelligent control system based on air conditioner cooling water system | |
| CN114877421A (en) | Air conditioning water system, control method and air conditioning unit | |
| CN204830333U (en) | Become water temperature control system suitable for air conditioner two stage pump system | |
| CN112178873A (en) | Adjusting and controlling method of water chilling unit and water chilling unit | |
| CN110864416A (en) | Start-stop optimization control method for central air-conditioning system | |
| CN114484948B (en) | Energy-saving multistage pump variable frequency linkage system | |
| CN114459136B (en) | High-energy-efficiency optimal control method for terminal equipment of central air conditioning system | |
| CN105020822A (en) | Variable pressure difference control system applicable to air conditioner first-stage pump system | |
| CN204987365U (en) | Become water temperature control system suitable for air conditioner one -level pumping system | |
| CN101922780A (en) | Fan coil system and control method thereof | |
| CN211177250U (en) | Cold source station control system of electronic factory building | |
| CN204830288U (en) | Control system is pressed to variation suitable for air conditioner one -level pumping system | |
| CN204478399U (en) | Centrifugal refrigerating machines exports the energy-efficient regulating system of energy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |