Energy-saving control method of heat pump system

Abstract

The invention relates to the technical field of heat pump adjustment, in particular to an energy-saving control method of a heat pump system, and aims to improve the accuracy of a temperature control strategy and realize an energy-saving control process by optimizing an automatic adjustment confirmation process of a heat pump operation state. The method comprises the steps that S1, a temperature sensor collects a heat source side water supply temperature value and an external environment temperature value; s2, according to the temperature control strategy, the heat source side monitors and analyzes the water supply temperature value and the external environment temperature value to generate an automatic adjustment coefficient; s3, feeding back to a heat source side control end according to the automatic adjustment coefficient, and generating a corresponding control instruction signal; s4, the water flow speed of a water return pump circulation module and the starting number of heat pump units are controlled according to the generated control instruction signal; and S5, the heated water is conveyed to a heat supply pipeline through a water return pump circulation module, and hot water is conveyed to a user side.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump regulation, and in particular to an energy-saving control method for a heat pump system. Background Art

[0002] Against the backdrop of "dual carbon" and "clean heating", electric heat pumps have become a development focus in the industry; with the continuous advancement of science and technology, heat pump technology has made significant progress in improving low-temperature performance, inhibiting frost, accurately defrosting, and providing thermal comfort.

[0003] In the process of heating by heat pump system, in order to achieve low-carbon development and save energy, temperature control is needed to realize energy-saving optimization process; the existing intelligent control system can flexibly adjust the temperature of heat pump unit, which usually requires setting control strategy. The control and adjustment methods usually include water temperature adjustment, flow adjustment and the combination of the two. Therefore, it is difficult to set control strategy to optimize the operation process.

[0004] In the prior art, although a control strategy is set up to realize the process of adjusting the temperature of the heat pump, it is difficult to grasp the loss of efficiency from the heating water temperature on the heat source side to the water temperature on the user side, resulting in difficulty in timely feedback to the water pump through appropriate control strategies during the actual temperature change process to make timely command control adjustments; resulting in the hidden danger of unstable heating or water supply problems on the user side. Summary of the invention

[0005] The purpose of the present invention is to provide an energy-saving control method for a heat pump system to solve the following technical problems:

[0006] How to optimize the automatic adjustment and confirmation process of the heat pump operating status to improve the energy-saving control accuracy of the temperature control strategy.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] An energy-saving control method for a heat pump system, the method comprising:

[0009] S1, the temperature sensor collects the water supply temperature value on the heat source side and the external environment temperature value;

[0010] S2. According to the temperature control strategy, the heat source side monitors and analyzes the water supply temperature value and the external environment temperature value to generate an automatic adjustment coefficient;

[0011] S3, feeding back the automatic adjustment coefficient to the control end on the heat source side to generate a corresponding control command signal;

[0012] S4, controlling the water flow rate of the return pump circulation module and the number of heat pump units started according to the generated control command signal;

[0013] S5. The heated water is sent to the heating pipe through the return pump circulation module, and the hot water is delivered to the user side.

[0014] Preferably, the temperature control strategy includes:

[0015] A temperature efficiency-time variation curve is constructed in a plane rectangular coordinate system, and the historical water supply temperature values ​​and external environment temperature values ​​collected by the temperature sensor are input into the temperature efficiency-time variation curve for analysis;

[0016] A control command signal is generated according to the analysis result; the control command signal includes: a water pump start signal, a water pump water replenishment signal, a water pump water reduction signal, and a water pump shut-down signal.

[0017] Preferably, the process of monitoring and analyzing the water supply temperature value and the external environment temperature value according to the temperature control strategy to generate the automatic adjustment coefficient in S2 is:

[0018] S21, through the formula Calculate and obtain the real-time temperature efficiency parameter ef(t);

[0019] S22, obtaining a curve E of the change of the real-time temperature efficiency parameter ef(t) over time within a preset time period;

[0020] S23, obtaining temperature performance parameter thresholds corresponding to a plurality of historical control signals, and setting a line connecting the temperature performance parameter thresholds corresponding to each control signal as a preset boundary;

[0021] S24, forming a plurality of closed spaces according to the preset boundary and the change curve E; marking the plurality of closed spaces to generate a plurality of over-temperature areas;

[0022] S25, calculating the maximum and average values ​​of the temperature efficiency parameters in each over-temperature zone to obtain the automatic adjustment coefficient.

[0023] Preferably, the automatic adjustment coefficient includes:

[0024] By formula Calculate the automatic adjustment coefficient Adj of the i-th overtemperature area i ;

[0025] Among them, ef i (t) is the real-time temperature performance parameter of the ith overtemperature area; maxef i (t) is the maximum value of the temperature performance parameter of the i-th overtemperature area; avef i (t) is the average value of the temperature efficiency parameter of the i-th overtemperature area; ef imax (t) is the maximum value of the standard variation curve of the temperature performance parameter in the i-th overtemperature area; ef ithr(t) is the standard value of the temperature efficiency parameter standard change curve of the i-th overtemperature area; W1 and W2 are both judgment conditions, and the judgment process is: when |maxef i (t)-ef imax (t)|≥ef Ai0 When W1{maxef i (t),ef imax (t)}=Q A ; when |maxef i (t)-ef imax (t)| <ef i0 When W1{maxef i (t),ef imax (t)}=|maxef i (t)-ef imax (t)|; when |avef i (t)-ef ithr (t)≥ef Bi0 When W2{avef i (t),ef ithr (t)}=Q B ; when |avef i (t)-ef ithr (t)| <ef Bi0 When W2{avef i (t),ef ithr (t)}=|avef i (t)-ef ithr (t)|;

[0026] Among them, Δef is the allowable error value of the temperature efficiency parameter; is the time point number corresponding to the real-time temperature efficiency parameter; n0 is the standard time point number; ef Ai0 ,ef Bi0 are the first temperature performance parameter allowable deviation value and the second temperature performance parameter allowable deviation value respectively; Q A is the first fixed warning value, Q B is the second fixed warning value;

[0027] According to the automatic adjustment coefficient Adj i The size is fed back to the control end on the heat source side.

[0028] Preferably, the method of feeding back the automatic adjustment coefficient to the heat source side control terminal and generating the corresponding control instruction in S3 is:

[0029] The automatic adjustment coefficient Adj i The automatic adjustment coefficient threshold interval of the i-th over-temperature area [Adj X , AdjY ] for comparison:

[0030] If Adj i <Adj X , then it is judged that the temperature change of the i-th over-temperature area is normal;

[0031] If Adj X ≤Adj i ≤ADj Y , then it is judged that the temperature change in the i-th over-temperature area poses a safety risk;

[0032] If Adj i >Adj Y , then it is judged that there is a safety problem in the temperature change of the i-th over-temperature area, and the machine is shut down for maintenance.

[0033] Preferably, it also includes:

[0034] When there is an over-temperature area during the analysis process, the temperature of the heat source side is controlled to generate a water pump start signal;

[0035] When the temperature on the heat source side returns to normal during the analysis process, a water pump shut-off signal is generated.

[0036] Preferably, when Adjx≤Adj i ≤Adj Y Get the real-time cooling efficiency:

[0037] By formula Calculate and obtain the real-time control efficiency coefficient Ef(t);

[0038] Where m is the total number of heat pumps, and k∈[1,m]; sta k The switch status of the water pump, 1 for on and 0 for off; P N Heating power for hot water on the heat source side; [t a , t b ] is the first flow time interval of circulating hot water from the return port to the outlet, and t a The start time of the first flow time interval, t b is the end time of the first flow time interval; [t c , t d ] is the second flow time interval where the water outlet is connected to the water inlet on the user side; and t c The start time of the second flow time interval, t d is the end time of the second flow time interval; τ1 is the first water supply delay, τ2 is the second water supply delay; T k (t-τ1) is the water supply temperature at time t-τ1, T k (t+τ2) is the water supply temperature at time t+τ2.

[0039] Preferably, the real-time control efficiency coefficient Ef(t) is compared with the standard value Ef thr To compare:

[0040] If Ef(t)<Ef thr , it is judged that the real-time heat dissipation efficiency is low, and a water pump replenishment signal is generated;

[0041] If Ef(t)≥Ef thr , it is judged that the real-time heat dissipation efficiency is high and a water pump water reduction signal is generated.

[0042] Preferably, the conditions for controlling the water flow rate of the return pump circulation module and the number of heat pump units started according to the generated control command signal in S4 are:

[0043] When the control command signal is a water pump replenishment signal, the water flow rate of the return pump circulation module is increased and the number of heat pump units started is reduced;

[0044] When the control command signal is a water pump water reduction signal, the water flow rate of the return pump circulation module is reduced and the number of heat pump units started is increased.

[0045] Beneficial effects of the present invention:

[0046] (1) The present invention monitors and analyzes the water supply temperature value and the external environment temperature value, generates an automatic adjustment coefficient by monitoring and analyzing the acquired temperature efficiency parameters, monitors the real-time change of temperature efficiency through the automatic adjustment coefficient, determines whether there is an over-temperature situation according to the temperature change range in the operation state of the heat pump, and then executes the instructions of the temperature control strategy to adjust the water temperature and flow rate according to the size of the generated over-temperature situation.

[0047] (2) The present invention feeds back the automatic adjustment coefficient to the control end on the heat source side, and the heat source control end further analyzes the heat dissipation state, determines the analysis result and generates a water pump replenishment signal and a water pump reduction signal; then, the water flow rate of the return water pump circulation module and the number of heat pump units started are controlled according to the generated control command signal, thereby improving the energy-saving control accuracy of the temperature control strategy.

[0048] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0050] Figure 1 This is a step diagram of the energy-saving control method of the heat pump system of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] See also Figure 1 As shown, the present invention is an energy-saving control method for a heat pump system, the method comprising:

[0053] S1, the temperature sensor collects the water supply temperature value on the heat source side and the external environment temperature value;

[0054] S2. According to the temperature control strategy, the heat source side monitors and analyzes the water supply temperature value and the external environment temperature value to generate an automatic adjustment coefficient;

[0055] S3, feeding back the automatic adjustment coefficient to the control end on the heat source side to generate a corresponding control command signal;

[0056] S4, controlling the water flow rate of the return pump circulation module and the number of heat pump units started according to the generated control command signal;

[0057] S5. The heated water is sent to the heating pipe through the return pump circulation module, and the hot water is delivered to the user side.

[0058] In the above technical scheme, due to the complex dynamics of the heat pump system, the heat pump system includes a heat pump unit module, a sensor module at the user end, a return pump circulation module equipped with a water pump and a make-up water pump, and a heating pipe network, etc.; the water supply heated by the heat pump unit module is transmitted to the user end through a pipeline, and the data information is transmitted by transmitting the data to the control center through the pipe network system on the heat source side of the heat pump unit module; and the temperature information is obtained by the temperature sensor set on the heat source side. The present invention realizes the real-time monitoring process of temperature efficiency and realizes the automatic adjustment process according to the control strategy by designing an energy-saving control method for a heat pump system, ensuring the continuous temperature supply while reducing the energy consumption of the heat source for heating the water supply to the required temperature.

[0059] Specifically, first, it is necessary to collect the water supply temperature value and the external ambient temperature value on the heat source side according to the temperature sensor. According to the changes in the water supply temperature value and the external ambient temperature value, it can be determined that the water supply temperature is affected by the ambient temperature, and then the temperature efficiency can be determined according to the ambient temperature; then according to the temperature control strategy, the water supply temperature value and the external ambient temperature value are monitored and analyzed on the heat source side to generate an automatic adjustment coefficient. By monitoring the real-time changes in temperature efficiency, it is convenient to determine whether the temperature change range in the operation state of the heat pump is normal. By monitoring the generated automatic adjustment coefficient, further judgment is made to determine whether there is an over-temperature situation and then the temperature control strategy is executed according to the size of the generated over-temperature situation. The water temperature and flow rate are adjusted by the instructions of the heat source side; then, the automatic adjustment coefficient is fed back to the control end on the heat source side, and the heat source control end further analyzes the heat dissipation state, determines the analysis result and generates a corresponding control instruction signal; further, the water flow rate of the return pump circulation module and the number of heat pump units started are controlled according to the generated control instruction signal; after the control instruction signal is generated, the PID controller is adaptively adjusted for the water pump circulation module and the number of heat pump units started, and the water flow rate (flow rate) and the number of heat pump units started (water temperature) are adjusted; finally, the heated water is sent to the heating pipe through the return pump circulation module, and the hot water is delivered to the user side, realizing the user water supply process.

[0060] As an embodiment of the present invention, the temperature control strategy includes:

[0061] A temperature efficiency-time variation curve is constructed in a plane rectangular coordinate system, and the historical water supply temperature values ​​and external environment temperature values ​​collected by the temperature sensor are input into the temperature efficiency-time variation curve for analysis;

[0062] A control command signal is generated according to the analysis result; the control command signal includes: a water pump start signal, a water pump water replenishment signal, a water pump water reduction signal, and a water pump shut-down signal.

[0063] In the above technical solution, the control of the heat source side through the temperature control strategy reflects the automatic adjustment process of the temperature change during the operation of the heat pump. Specifically, first, a temperature efficiency-time change curve and a coordinate system with temperature efficiency as the ordinate and time as the abscissa are constructed in a plane rectangular coordinate system, and the historical water supply temperature values ​​and external environmental temperature values ​​collected by the temperature sensor are input into the temperature efficiency-time change curve for analysis; by limiting the input historical water supply temperature values ​​and external environmental temperature values, and then limiting the time corresponding to each temperature, the data entry of the temperature efficiency-time change curve is realized, and then the standard value can be set for comparison, and then the analysis is performed according to the curve changes to realize the automatic adjustment process.

[0064] As an implementation mode of the present invention, the process of monitoring and analyzing the water supply temperature value and the external environment temperature value according to the temperature control strategy in S2 to generate the automatic adjustment coefficient is:

[0065] S21, through the formula Calculate and obtain the real-time temperature efficiency parameter ef(t);

[0066] S22, obtaining a curve E of the change of the real-time temperature efficiency parameter ef(t) over time within a preset time period;

[0067] S23, obtaining temperature performance parameter thresholds corresponding to a plurality of historical control signals, and setting a line connecting the temperature performance parameter thresholds corresponding to each control signal as a preset boundary;

[0068] S24, forming a plurality of closed spaces according to the preset boundary and the change curve E; marking the plurality of closed spaces to generate a plurality of over-temperature areas;

[0069] S25, calculating the maximum and average values ​​of the temperature efficiency parameters in each over-temperature zone to obtain the automatic adjustment coefficient.

[0070] In the above technical scheme, the automatic adjustment in step S2 is further refined: first, the temperature efficiency parameter is obtained by calculation, and the temperature efficiency parameter is entered as the vertical coordinate information of the temperature efficiency-time change curve, and then the time change curve E of the real-time temperature efficiency parameter ef(t) within the historical preset time period can be obtained; then, a standard control for monitoring and analysis is obtained, and a preset boundary is formed by setting the temperature efficiency parameter thresholds corresponding to multiple historical control signals and connecting the temperature efficiency parameter thresholds corresponding to each control signal; a number of closed spaces are formed according to the preset boundary and the change curve E, and the closed space portion exceeding the preset boundary is used as an over-temperature area; finally, the maximum value and average value of the temperature efficiency parameters in each over-temperature area are calculated to obtain the automatic adjustment coefficient.

[0071] As an implementation mode of the present invention, the automatic adjustment coefficient includes:

[0072] By formula Calculate the automatic adjustment coefficient Adj of the i-th overtemperature area i ;

[0073] Among them, ef i (t) is the real-time temperature performance parameter of the ith overtemperature area; maxef i (t) is the maximum value of the temperature performance parameter of the i-th overtemperature area; avef i (t) is the average value of the temperature efficiency parameter of the i-th overtemperature area; ef imax(t) is the maximum value of the standard variation curve of the temperature performance parameter in the i-th overtemperature area; ef ithr (t) is the standard value of the temperature efficiency parameter standard change curve of the i-th overtemperature area; W1 and W2 are both judgment conditions, and the judgment process is: when |maxef i (t)-ef imax (t)|≥ef Ai0 When W1{maxef i (t),ef imax (t)}=Q A ; when |maxef i (t)-ef imax (t)| <ef i0 When W1{maxef i (t),ef imax (t)}=|maxef i (t)-ef imax (t)|; when |avef i (t)-ef ithr (t)|≥ef Bi0 When W2{avef i (t),ef ithr (t)}=Q B ; when |avef i (t)-ef ithr (t)| <ef Bi0 When W2{avef i (t),ef ithr (t)}=|avef i (t)-ef ithr (t)|;

[0074] Among them, Δef is the allowable error value of the temperature efficiency parameter; is the time point number corresponding to the real-time temperature efficiency parameter; n0 is the standard time point number; ef Ai0 ,ef Bi0 are the first temperature performance parameter allowable deviation value and the second temperature performance parameter allowable deviation value respectively; Q A is the first fixed warning value, Q B is the second fixed warning value;

[0075] According to the automatic adjustment coefficient Adj i The size is fed back to the control end on the heat source side.

[0076] In the above technical solution, the calculation formula for obtaining the automatic adjustment coefficient is It can be seen from the formula that by calculating the temperature performance parameter peak value out-of-tolerance state W1{maxef i(t),ef imax (t)}, temperature performance parameter mean value out-of-tolerance state W2{avef i (t),ef ithr (t)} and the fluctuation of acquisition time Comprehensive calculation is performed; when the product of the peak value and the average value is larger, the automatic adjustment coefficient is larger, and the area that needs temperature adjustment is also larger; therefore, before making a judgment, the judgment condition is first set. When |maxef i (t)-ef imax (t)|≥ef Ai0 When W1{maxef i (t),ef imax (t)}=Q A 、When |avef i (t)-ef ithr (t)|≥ef Bi0 When W2{avef i (t),ef ithr (t)}=Q B ; According to the fixed warning value, the abnormal state result is directly warned in advance; otherwise, the automatic adjustment coefficient is further analyzed and the automatic adjustment coefficient Adj is used. i The size is fed back to the control end on the heat source side.

[0077] As an implementation mode of the present invention, the method of feeding back the automatic adjustment coefficient to the control end on the heat source side and generating the corresponding control instruction in S3 is:

[0078] The automatic adjustment coefficient Adj i The automatic adjustment coefficient threshold interval of the i-th over-temperature area [Adj X , Adj Y ] for comparison:

[0079] If Adj i <Adj X , then it is judged that the temperature change of the i-th over-temperature area is normal;

[0080] If Adj X ≤Adj i ≤Adj Y , then it is judged that the temperature change in the i-th over-temperature area poses a safety risk;

[0081] If Adj i >Adj Y , then it is judged that there is a safety problem in the temperature change of the i-th over-temperature area, and the machine is shut down for maintenance.

[0082] In the above technical solution, the automatic adjustment coefficient is judged by comparison analysis. The specific judgment process is to compare the automatic adjustment coefficient Adj i The threshold interval of the automatic adjustment coefficient obtained by fitting the empirical data [Adj X , Adj Y ], where Adj X is the minimum value of the threshold interval; Adj Y is the maximum value of the threshold interval; when the automatic adjustment coefficient Adj i <Adj X , then it is judged that the temperature change of the i-th over-temperature area is normal; when Adj X ≤Adj i ≤Adj Y , then it is judged that the temperature change in the i-th over-temperature area has a safety risk, and further heat dissipation status judgment is required; when Adj i >Adj Y , then it is judged that there is a safety problem in the temperature change of the i-th over-temperature area, and the machine is shut down for maintenance.

[0083] It needs to be explained that Q A , Q B All are preset fixed values. When W1{maxef i (t),ef imax (t)}=Q A or W2{avef i (t),ef ithr (t)}=Q B When the automatic adjustment coefficient Adj i Should exceed the threshold range [Adj X , Adj Y ].

[0084] As an embodiment of the present invention, it also includes:

[0085] When there is an over-temperature area during the analysis process, the temperature of the heat source side is controlled to generate a water pump start signal;

[0086] When the temperature on the heat source side returns to normal during the analysis process, a water pump shut-off signal is generated.

[0087] In the above technical solution, cooling treatment is required for the situation where there is an over-temperature area. The cooling process is carried out by turning on the water pump to adjust the water temperature and generating a water pump start signal. After analysis, when the water temperature adjustment is completed and the temperature on the heat source side is within the normal range, a water pump shutdown signal is generated to reduce the loss in water transportation.

[0088] As an embodiment of the present invention, when Adj X ≤Adj i ≤AdjY Get the real-time cooling efficiency:

[0089] By formula Calculate and obtain the real-time control efficiency coefficient Ef(t);

[0090] Where m is the total number of heat pumps, and k∈[1,m]; sta k The switch status of the water pump, 1 for on and 0 for off; P N Heating power for hot water on the heat source side; [t a , t b ] is the first flow time interval of circulating hot water from the return port to the outlet, and t a The start time of the first flow time interval, t b is the end time of the first flow time interval; [t c , t d ] is the second flow time interval where the water outlet is connected to the water inlet on the user side; and t c The start time of the second flow time interval, t d is the end time of the second flow time interval; τ1 is the first water supply delay, τ2 is the second water supply delay; T k (t-τ1) is the water supply temperature at time t-τ1, T k (t+τ2) is the water supply temperature at time t+τ2;

[0091] In the above technical solution, since when Adj X ≤Adj i ≤Adj Y , it is determined whether there is a problem with heat dissipation efficiency. In this embodiment, the formula The real-time control efficiency coefficient EF(t) is calculated; the real-time heat dissipation is determined according to the real-time control efficiency coefficient Ef(t). Specifically, the heat dissipation of the circulating hot water from the return port to the outlet during the first flow time and the heat dissipation of the outlet connected to the user-side inlet during the second flow time are comprehensively analyzed to determine the heat dissipation efficiency of the water supply temperature; and because the water supply time is affected by the water supply delay, the real-time data needs to be adjusted; through T k (t-τ1) reflects the real-time value corresponding to the first flow time interval of circulating hot water from the return port to the outlet; k (t+τ2) reflects the real-time value corresponding to the second flow time interval of the water inlet connected to the user side water inlet; and according to the difference between the two To reflect the result of adding the heat dissipation value of the circulating hot water from the return port to the water outlet at the first flow time and the heat dissipation value of the water outlet connected to the user-side water inlet at the second flow time; and The larger it is, the larger the real-time control efficiency coefficient Ef(t) is, and the higher the heat dissipation efficiency is.

[0092] As an embodiment of the present invention, the real-time control efficiency coefficient Ef(t) is compared with the standard value Ef thr To compare:

[0093] If Ef(t)<Ef thr , it is judged that the real-time heat dissipation efficiency is low, and a water pump replenishment signal is generated;

[0094] If Ef(t)≥Ef thr , it is judged that the real-time heat dissipation efficiency is high and a water pump water reduction signal is generated.

[0095] In the above technical solution, the real-time control efficiency coefficient Ef(t) is compared with the standard value Ef thr When the heat dissipation efficiency is low, below the standard value EF thr When the water pump is full, a water pump replenishment signal is generated to increase the water pump flow and reduce the temperature; otherwise, a water pump reduction signal is generated to timely reduce the water pump flow and increase the temperature to ensure that the water supply temperature is within the normal range. The water pump replenishment signal and the water pump reduction signal are executed by the water pump replenishment and reduction processes.

[0096] As an embodiment of the present invention, the conditions for controlling the water flow rate of the return pump circulation module and the number of heat pump units started according to the generated control command signal in S4 are:

[0097] When the control command signal is a water pump replenishment signal, the water flow rate of the return pump circulation module is increased and the number of heat pump units started is reduced;

[0098] When the control command signal is a water pump water reduction signal, the water flow rate of the return pump circulation module is reduced and the number of heat pump units started is increased.

[0099] In the above technical solution, the initial water flow velocity v0 in the water pump is determined, and the initial startup number n0 of the heat pump unit is determined; when the water pump replenishment signal is generated (Ef(t)<Ef thr ), the increased water flow rate Reduced number of boots Generate water pump water reduction signal (Ef(t)≥EF thr ), the reduced water flow velocity Increased number of boots

[0100] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0101] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined in this application, they shall all fall within the protection scope of the present invention.

Claims

1. An energy-saving control method for a heat pump system, characterized in that: The method comprises: S1, the temperature sensor collects the water supply temperature value on the heat source side and the external environment temperature value; S2. According to the temperature control strategy, the heat source side monitors and analyzes the water supply temperature value and the external environment temperature value to generate an automatic adjustment coefficient; S3, feeding back the automatic adjustment coefficient to the control end on the heat source side to generate a corresponding control command signal; S4, controlling the water flow rate of the return pump circulation module and the number of heat pump units started according to the generated control command signal; S5. The heated water is sent to the heating pipe through the return pump circulation module, and the hot water is delivered to the user side.

2. The energy-saving control method of the heat pump system according to claim 1, characterized in that: The temperature control strategy includes: A temperature efficiency-time variation curve is constructed in a plane rectangular coordinate system, and the historical water supply temperature values ​​and external environment temperature values ​​collected by the temperature sensor are input into the temperature efficiency-time variation curve for analysis; A control command signal is generated according to the analysis result; the control command signal includes: a water pump start signal, a water pump water replenishment signal, a water pump water reduction signal, and a water pump shut-down signal.

3. The energy-saving control method of the heat pump system according to claim 2, characterized in that: The process of monitoring and analyzing the water supply temperature value and the external environment temperature value according to the temperature control strategy in S2 to generate the automatic adjustment coefficient is: S21, through the formula Calculate and obtain the real-time temperature efficiency parameter ef(t); S22, obtaining a curve E of the change of the real-time temperature efficiency parameter ef(t) over time within a preset time period; S23, obtaining temperature performance parameter thresholds corresponding to a plurality of historical control signals, and setting a line connecting the temperature performance parameter thresholds corresponding to each control signal as a preset boundary; S24, forming a plurality of closed spaces according to the preset boundary and the change curve E; marking the plurality of closed spaces to generate a plurality of over-temperature areas; S25, calculating the maximum and average values ​​of the temperature efficiency parameters in each over-temperature zone to obtain the automatic adjustment coefficient.

4. The energy-saving control method of the heat pump system according to claim 3, characterized in that: The automatic adjustment coefficient includes: By formula Calculate the automatic adjustment coefficient Adj of the i-th overtemperature area i ; Among them, ef i (t) is the real-time temperature performance parameter of the ith overtemperature area; maxef i (t) is the maximum value of the temperature performance parameter of the i-th overtemperature area; avef i (t) is the average value of the temperature efficiency parameter of the i-th overtemperature area; ef imax (t) is the maximum value of the standard variation curve of the temperature performance parameter in the i-th overtemperature area; ef ithr (t) is the standard value of the temperature efficiency parameter standard change curve of the i-th overtemperature area; W1 and W2 are both judgment conditions, and the judgment process is: when |maxef i (t)-ef imax (t)|≥ef Ai0 When W1{maxef i (t),ef imax (t)}=Q A ; when |maxef i (t)-ef imax (t)| <ef i0 When W1{maxef i (t),ef imax (t)}=|maxef i (t)-ef imax (t)|; when |avef i (t)-ef ithr (t)|≥ef Bi0 When W2{avef i (t),ef ithr (t)}=Q B ; when |avef i (t)-ef ithr (t)| <ef Bi0 When W2{avef i (t),ef ithr (t)}=|avef i (t)-ef ithr (t)|; Among them, Δef is the allowable error value of the temperature efficiency parameter; is the time point number corresponding to the real-time temperature efficiency parameter; n0 is the standard time point number; ef Ai0 ,ef Bi0 are the first temperature performance parameter allowable deviation value and the second temperature performance parameter allowable deviation value respectively; Q A is the first fixed warning value, Q B is the second fixed warning value; According to the automatic adjustment coefficient Adj i The size is fed back to the control end on the heat source side.

5. The energy-saving control method of the heat pump system according to claim 4, characterized in that: The method of feeding back the automatic adjustment coefficient to the heat source side control terminal and generating the corresponding control instruction in S3 is: The automatic adjustment coefficient Adj i The automatic adjustment coefficient threshold interval of the i-th over-temperature area [Adj X , Adj Y ] for comparison: If Adj i <Adj X , then it is judged that the temperature change of the i-th over-temperature area is normal; If Adj X ≤Adj i ≤Adj Y , then it is judged that the temperature change in the i-th over-temperature area poses a safety risk; If Adj i >Adj Y , then it is judged that there is a safety problem in the temperature change of the i-th over-temperature area, and the machine is shut down for maintenance.

6. The energy-saving control method of the heat pump system according to claim 5, characterized in that: Also includes: When there is an over-temperature area during the analysis process, the temperature of the heat source side is controlled to generate a water pump start signal; When the temperature on the heat source side returns to normal during the analysis process, a water pump shut-off signal is generated.

7. The energy-saving control method of the heat pump system according to claim 5, characterized in that: When Adj X ≤Adj i ≤ADj Y Get the real-time cooling efficiency: By formula Calculate and obtain the real-time control efficiency coefficient Ef(t); Where m is the total number of heat pumps, and k∈[1,m]; sta k The switch status of the water pump, 1 for on and 0 for off; P N Heating power for hot water on the heat source side; [t a , t b ] is the first flow time interval of circulating hot water from the return port to the outlet, and t a The start time of the first flow time interval, t b is the end time of the first flow time interval; [t c , t d ] is the second flow time interval where the water outlet is connected to the water inlet on the user side; and t c The start time of the second flow time interval, t d is the end time of the second flow time interval; τ1 is the first water supply delay, τ2 is the second water supply delay; T k (t-τ1) is the water supply temperature at time t-τ1, T k (t+τ2) is the water supply temperature at time t+τ2.

8. The energy-saving control method of the heat pump system according to claim 7, characterized in that: The real-time control efficiency coefficient Ef(t) is compared with the standard value Ef thr To compare: If Ef(t)<Ef thr , it is judged that the real-time heat dissipation efficiency is low, and a water pump replenishment signal is generated; If Ef(t)≥Ef thr , it is judged that the real-time heat dissipation efficiency is high and a water pump water reduction signal is generated.

9. The energy-saving control method of the heat pump system according to claim 8, characterized in that: The condition for controlling the water flow rate of the return pump circulation module and the number of heat pump units started according to the generated control command signal in S4 is: When the control command signal is a water pump replenishment signal, the water flow rate of the return pump circulation module is increased and the number of heat pump units started is reduced; When the control command signal is a water pump water reduction signal, the water flow rate of the return pump circulation module is reduced and the number of heat pump units started is increased.

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