CN111765648A - Anti-freezing control method, processor and air source heat pump system - Google Patents
Anti-freezing control method, processor and air source heat pump system Download PDFInfo
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- CN111765648A CN111765648A CN202010350628.XA CN202010350628A CN111765648A CN 111765648 A CN111765648 A CN 111765648A CN 202010350628 A CN202010350628 A CN 202010350628A CN 111765648 A CN111765648 A CN 111765648A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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Abstract
The invention provides an anti-freezing control method, a processor and an air source heat pump system, and belongs to the technical field of air source heat pumps. It has solved prior art can not well solve the problem of preventing frostbite. The anti-freezing control method is used for an air source heat pump system, the air source heat pump system comprises at least one heat pump unit, and the control method comprises the following steps: according to the outdoor ambient temperature T in the power-on state of the unithjJudging whether to start an anti-freezing control mode; in the antifreeze control mode, according to TsTakes different antifreeze actions, here TsThe temperature of water on a circulating water path arranged between the heat pump unit and a user use side is set; and if the exit condition of the anti-freezing control mode is met, exiting the anti-freezing control mode, and the like. The anti-freezing control method, the processor and the air source heat pump system have the advantages that: can make the heat pump unit deal with various conditions which may lead to freezing, effectively improve the anti-freezing effect of the unitThe normal operation of the unit is ensured, and the service life of the unit is prolonged.
Description
Technical Field
The invention belongs to the technical field of air source heat pumps, and particularly relates to an anti-freezing control method, a processor and an air source heat pump system.
Background
At present, air source heat pumps are increasingly popular, and are more and more applied in north. However, the temperature in winter in the north is low, and the problems of frost cracking and the like of a water pipe are easily caused by the common situation that the conventional unit is untimely in freezing prevention due to unreasonable freezing prevention control when running in winter (because the unit is in standby, water does not circulate, the frozen water is frozen when the ambient temperature is lower than 0 ℃, the frozen water volume is expanded, and the waterway heat exchanger is expanded), the normal running of the unit is influenced, and the service life of the unit is further influenced.
Disclosure of Invention
A first object of the present invention is to provide an antifreeze control method that solves the above-mentioned problems.
It is a second object of the invention to provide a processor for performing the above method.
A third object of the present invention is to provide an air source heat pump system including a processor for executing the above control method, so that the heat pump unit can still operate normally at low temperature.
In order to achieve the purpose, the invention adopts the following technical scheme: the anti-freezing control method is used for an air source heat pump system, the air source heat pump system comprises at least one heat pump unit, and the anti-freezing control method is characterized in that: the control method comprises the following steps:
according to the outdoor ambient temperature T in the power-on state of the unithjJudging whether to start an anti-freezing control mode;
in the antifreeze control mode, according to TsTakes different antifreeze actions, here TsThe temperature of water on a circulating water path arranged between the heat pump unit and a user use side is set;
and if the exit condition of the anti-freezing control mode is met, exiting the anti-freezing control mode.
And repeating the steps at preset intervals until the unit is powered off.
In the above-mentioned freezing preventionIn the control method, the unit is electrified according to the outdoor environment temperature ThjThe step of determining whether to activate the anti-freeze control mode includes:
judging whether the heat pump unit is in a shutdown state or in a refrigeration standby state;
the judgment condition is Thj＜T1Whether or not, here T1Starting an environmental temperature threshold value for preset anti-freezing protection;
and if the two conditions are both met, entering an anti-freezing control mode.
In the above-mentioned antifreeze control method, the step of exiting the antifreeze control mode if the exit condition of the antifreeze control mode is met includes:
judging whether the starting requirement of at least one heat pump unit is met or not;
the judgment condition is TS≥T4Whether or not, here T4A preset anti-freeze protection exit water temperature threshold value;
and if any one of the two conditions is met, exiting the anti-freezing control mode.
In the above antifreeze control method, according to TsThe different steps of taking different anti-freezing operations comprise:
the judgment condition is Ts≥T2And whether the compressor is not used for performing anti-freezing operation is established, wherein T is2If the first anti-freezing protection water temperature threshold is set, the circulating water pump arranged on a circulating water path between the heat pump unit and a user use side needs to be operated intermittently;
the judgment condition is T3≤Ts＜T2Whether or not, here T3If the water temperature is the preset second anti-freezing protection water temperature threshold value, the circulating water pump needs to be operated continuously;
the judgment condition is Ts＜T3And if the temperature is not lower than the preset temperature, at least one heat pump unit needs to perform heating operation by taking a standby heating target temperature lower than the starting heating target temperature in the starting heating mode in the heating standby state.
In the above-described antifreeze control method, the determination condition is Ts≥T2And whether the step of the compressor-free anti-freezing operation is established also comprises the step of judging whether the conditions are met for the first time, if so, an intermittent operation mode of firstly operating the circulating water pump and then stopping the operation and repeating the operation is adopted, and if not, the circulating water pump is operated in a mode opposite to the above mode.
In the above-described antifreeze control method, the determination condition is Ts＜T3Whether the step is established or not further comprises the step of judging whether the started heat pump unit has a fault or not, and if so, starting an electric heating element for heating the temperature of water in a circulating water path between the heat pump unit and a user use side; when the judgment condition is Ts＜T3In the step of judging whether the temperature is satisfied, the value of the standby heating target temperature is T4。
In the above-described antifreeze control method, the determination condition is TS≥T4The step of determining whether the result is true further comprises the step of determining whether T is satisfiedS≥T4When the condition (2) is satisfied, it is determined that the condition (T) is continuously satisfiedS≥T4If the time is more than or equal to the preset duration time, the anti-freezing control mode can be exited only if the two conditions are met simultaneously; to satisfy the condition TS≥T4When the mode (2) exits the anti-freezing control mode, the circulating water pump needs to run for a preset delay time and then stops.
In the above-mentioned antifreeze control method, the outdoor ambient temperature T is used as a reference in the power-on state of the unithjBefore the step of judging whether to start the anti-freezing control mode, if T is obtained on the heat pump unithjTemperature sensor of (2) is out of order and is shut down and Ts＜T2Temporal or temporal evolution of T for heat pump unitsSTemperature sensor of (2) is out of order and is shut down and Thj＜T1And when the heat pump unit is stopped due to other faults, starting the circulating water pump and continuously running until the heat pump unit is powered off.
The processor is used for executing the program, wherein the program executes the steps in the control method.
The air energy heat pump hot water system comprises at least one heat pump unit and is characterized in that each heat pump unit is provided with an outdoor environment temperature sensor, a water inlet pipe and a water outlet pipe are arranged between each heat pump unit and a user use side, each water inlet pipe is provided with a water inlet temperature sensor, each water outlet pipe is provided with a water outlet temperature sensor, at least one of the water inlet pipes and the water outlet pipes is provided with a circulating water pump and an electric heating element, a processor, a memory and a computer program stored on the memory, and the processor is the processor.
Compared with the prior art, the anti-freezing control method, the processor and the air source heat pump system have the advantages that: the heat pump unit can be used for dealing with various conditions which possibly lead to freezing, the anti-freezing effect of the heat pump unit is effectively improved, the normal operation of the heat pump unit is ensured, and the service life of the heat pump unit is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 provides a schematic structural diagram in an embodiment of the present invention.
In the figure, a heat pump unit 100, an outdoor environment temperature sensor 101, an inlet water temperature sensor 102, an outlet water temperature sensor 103, an inlet pipe 104, an outlet pipe 105, a circulating water pump 106, an electric heating element 107, a water flow switch 108 and a user use side 200 are provided.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1, the air-source heat pump hot water system includes two heat pump units 100, each heat pump unit 100 is provided with an outdoor environment temperature sensor 101, a water inlet pipe 104 and a water outlet pipe 105 are arranged between each heat pump unit 100 and a user use side 200, each water inlet pipe 104 is provided with a water inlet temperature sensor 102, each water outlet pipe 105 is provided with a water outlet temperature sensor 103, at least one of all the water inlet pipes 104 and the water outlet pipes 105 is provided with a circulating water pump 106 and an electric heating element 107, and a processor, a memory and a computer program stored in the memory, wherein the processor executes the following steps in the anti-freezing control method.
It should be noted that the number of the heat pump units 100 is not limited herein, and may be one single unit or multiple units, as required.
In addition, here, the user use side 200 is also provided with a heat exchanger, and a circulation water path (i.e., a water inlet pipe 104 and a water outlet pipe 105 as shown in fig. 1) is provided between the heat pump unit 100 and the user use side 200, and performs secondary heat exchange with the heat exchanger on the user use side 200 through the circulation water path.
The anti-freezing control method is used for the air source heat pump system and comprises the following steps.
T is as followshjIs the outdoor ambient temperature, TsFor the temperature, T, of water in a circulating water circuit between the heat pump unit and the user's side1Starting the ambient temperature threshold, T, for a predetermined freeze protection2Is a preset first anti-freezing protection water temperature threshold value, T3Is a preset second freeze protection water temperature threshold, T4And the exit water temperature threshold value is a preset anti-freezing protection exit water temperature threshold value.
Note that T issThe lowest temperature of the water temperatures measured by the inlet water temperature sensor 102 and the outlet water temperature sensor 103 in all the heat pump units 100 is the lowest temperature.
In addition, T1The adjustable range is 2-5 ℃, the optimal temperature is 3 ℃, because when the ambient temperature is lower than 0 ℃ and the heat pump main unit 100 does not operate, the water has the risk of freezing, and the optimal temperature of 3 ℃ is higher than 0 ℃ because the outdoor ambient temperature sensor 101 detects how much deviation or not in time.
In addition, T2Adjustable range of 7 ^ e10 ℃, preferably 8 ℃, when the heat pump main body 100 is standby and not running, T is detecteds＞T2The heat pump main unit 100 enters the stage 1 freeze protection, i.e. the circulating water pump 106 is operated intermittently, so as to prevent the temperature of the water in the water path heat exchanger and the water inlet pipe 104 and the water outlet pipe 105 from being reduced continuously.
In addition, T3The adjustable range is 3-6 ℃, and the optimal range is 5 ℃ (note that the water temperature in the waterway heat exchanger can only be detected by the inlet water temperature sensor 102 and the outlet water temperature sensor 103 which are arranged close to the waterway heat exchanger, when water stands, the water temperature in other places of the pipeline can be 3-5 ℃ lower than the water temperature detected in the waterway heat exchanger, and the detection temperature of the water temperature can deviate), when the heat pump unit 100 is standby and does not operate, when T3 is detected to be more than or equal to Ts and less than T2, the heat pump host 100 enters 2-level anti-freezing, namely, the circulating water pump 106 is continuously operated, and the water in the waterway heat exchanger and the water.
In addition, T4The adjustable range is 12-18 ℃, the preference is 15 ℃ (note that the water temperature reaches 15 ℃, the water channel can be guaranteed not to have freezing risk, the water temperature is guaranteed not to be reduced too much in a period of time when the heat pump main unit 100 stops working, the waste of electric energy caused by frequent starting of the heat pump main unit 100 is avoided), and when T is detecteds＜T3The heat pump main unit 100 enters 3-stage anti-freezing, the heat pump main unit 100 is started to perform heating operation, the water in the waterway heat exchanger and the water pipe is heated and raised by the heat pump main unit 100, and when the water temperature reaches T4And (4) stopping the freeze protection (note: if the heat pump main unit 100 fails and cannot normally operate after entering the 3-stage freeze protection, starting the electric heating element 107 on the main pipeline to heat the water in the waterway heat exchanger and the water pipe.
When the heat pump unit 100 is powered on and the heat pump unit 100 has no fault, the anti-freezing control method is used in the air source heat pump system and comprises the following steps.
Step 110, judging whether the condition is that the heat pump unit 100 is in a shutdown state or a refrigeration standby state.
Step 120, judging the condition as Thj＜T1Whether or not this is true.
And step 130, if the two conditions are met, entering an anti-freezing control mode.
200, in the anti-freezing control mode, according to TsDifferent antifreeze operations are adopted.
Step 210, judging the condition is Ts≥T2And whether the compressor-free operation is established or not, if so, the circulation water pump 106 provided on the circulation water path between the heat pump unit 100 and the user use side 200 needs to be operated intermittently.
Step 211, judging the condition as Ts≥T2And whether the step of the compressor-free anti-freezing operation is established also comprises the step of judging whether the conditions are met for the first time, if so, the operation of the circulating water pump 106 is firstly carried out, then the operation is stopped, and if not, the circulating water pump 106 is operated in a reciprocating intermittent operation mode, and if not, the circulating water pump 106 is operated in a mode opposite to the above mode.
Specifically, the above-mentioned intermittent operation mode may be: the circulation water pump 106 is stopped for 10 minutes and operated for 5 minutes, but the stop time and the operation time of the circulation water pump 106 may be set differently as needed.
Step 220, judging the condition is T3≤Ts＜T2If yes, the circulating water pump 106 needs to be operated continuously.
Preferably, in step 220, T is not only satisfied until the continuous-operation recirculating water pump 106 is continuously operated3≤Ts＜T2This condition, and the satisfaction of said T for a preset duration (for example 10 seconds)3≤Ts＜T2The condition is always satisfied.
Step 230, judging the condition as Ts＜T3If the temperature is not lower than the set-up heating target temperature in the set-up heating mode, the at least one heat pump unit 100 is required to perform heating operation with a target standby heating target temperature lower than the set-up heating target temperature in the set-up heating mode in the heating standby state.
Step 231 of judging the conditionsIs Ts＜T3The step of judging whether the heat pump unit 100 is started up is also included, if yes, an electric heating element 107 for heating the temperature of water in a circulating water path between the heat pump unit 100 and the user use side 200 is started up; when the judgment condition is Ts＜T3In the step of judging whether the temperature is satisfied, the value of the standby heating target temperature is T4。
And step 300, if the exit condition of the anti-freezing control mode is met, exiting the anti-freezing control mode.
In step 310, it is determined whether at least one heat pump unit 100 has a startup requirement.
Step 320, judging the condition as TS≥T4Whether or not this is true.
Step 321, it is further determined that the continuous compliance condition is TS≥T4If the time is greater than or equal to the preset duration, the anti-freeze control mode can be exited only if the two conditions in step 320 and step 321 are satisfied simultaneously, and the circulating water pump 106 needs to operate for the preset delay time and then stop.
It should be noted that the preset another duration may be set as required (e.g. 10 seconds), and the preset delay time may also be set as required (e.g. 3 minutes).
And step 330, if any one of the two conditions is met, exiting the anti-freezing control mode.
It should be noted that, after exiting the anti-freeze control mode, the heat pump unit 100 is turned back to the off state or the cooling standby state.
Step 400, repeating the steps at preset intervals until the heat pump unit 100 is powered off.
In addition, in a special case where there is a failure in the heat pump unit 100, the antifreeze control method does not take the above steps, but takes the following steps: i.e. based on the outdoor ambient temperature T when the heat pump unit 100 is energizedhjBefore the step of determining whether to activate the freeze protection control mode, if a T is obtained for the heat pump unit 100hjIs out of the way of the temperature sensorStopped with a fault and Ts＜T2Temporal or temporal use for obtaining T in heat pump units 100STemperature sensor of (2) is out of order and is shut down and Thj＜T1When the heat pump unit 100 is shut down due to other failures, the circulating water pump 106 is started and continuously operated until the heat pump unit 100 is powered off.
Two specific examples of the antifreeze control method are given below, and the following examples are illustrative of the present invention and the present invention is not limited to the following examples.
Case one
When the heat pump unit 100 is not operated in a standby mode, the ambient temperature is 2 ℃, and the inlet/outlet water temperature is 6 ℃, the heat pump unit 100 enters 2-stage anti-freezing, the circulating water pump 106 in the circulating water path is started, and the heat pump unit operates continuously, so that the problem that the local water temperature is frozen after being lower than 0 ℃ due to non-circulation of water is solved.
Case two
When the heat pump unit 100 is not operated in a standby mode, the ambient temperature is 2 ℃, and the water inlet/outlet temperature is 4 ℃, the heat pump unit 100 immediately enters 3-stage anti-freezing (highest-stage anti-freezing), the heat pump unit 100 is started to perform heating operation according to the set temperature of 15 ℃ (the circulating water pump 106 is always operated), and the heat pump unit 100 is prevented from being operated after the water temperature reaches 15 ℃ (considering that the heat pump unit 100 continues to work and electric energy is wasted).
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although terms such as heat pump unit 100, outdoor ambient temperature sensor 101, incoming water temperature sensor 102, outgoing water temperature sensor 103, incoming water pipe 104, outgoing water pipe 105, circulating water pump 106, electric heating element 107, water flow switch 108, user side 200 are used more often 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; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. An anti-freezing control method is used for an air source heat pump system, the air source heat pump system comprises at least one heat pump unit, and the anti-freezing control method is characterized in that: the control method comprises the following steps:
according to the outdoor ambient temperature T in the power-on state of the unithjJudging whether to start an anti-freezing control mode;
in the antifreeze control mode, according to TsTakes different antifreeze actions, here TsThe temperature of water on a circulating water path arranged between the heat pump unit and a user use side is set;
and if the exit condition of the anti-freezing control mode is met, exiting the anti-freezing control mode.
And repeating the steps at preset intervals until the unit is powered off.
2. The antifreeze control method as set forth in claim 1, wherein said control method is based on an outdoor ambient temperature T in a unit power-on statehjThe step of determining whether to activate the anti-freeze control mode includes:
judging whether the heat pump unit is in a shutdown state or in a refrigeration standby state;
the judgment condition is Thj＜T1Whether or not, here T1Starting an environmental temperature threshold value for preset anti-freezing protection;
and if the two conditions are both met, entering an anti-freezing control mode.
3. The antifreeze control method according to claim 2, wherein the step of exiting the antifreeze control mode if the exit condition of the antifreeze control mode is satisfied comprises:
judging whether the starting requirement of at least one heat pump unit is met or not;
the judgment condition is TS≥T4Whether or not, here T4A preset anti-freeze protection exit water temperature threshold value;
and if any one of the two conditions is met, exiting the anti-freezing control mode.
4. The antifreeze control method according to claim 3, wherein said control is performed according to TsThe different steps of taking different anti-freezing operations comprise:
the judgment condition is Ts≥T2And whether the compressor is not used for performing anti-freezing operation is established, wherein T is2If the first anti-freezing protection water temperature threshold is set, the circulating water pump arranged on a circulating water path between the heat pump unit and a user use side needs to be operated intermittently;
the judgment condition is T3≤Ts＜T2Whether or not, here T3If the water temperature is the preset second anti-freezing protection water temperature threshold value, the circulating water pump needs to be operated continuously;
the judgment condition is Ts＜T3And if the temperature is not lower than the preset temperature, at least one heat pump unit needs to perform heating operation by taking a standby heating target temperature lower than the starting heating target temperature in the starting heating mode in the heating standby state.
5. The antifreeze control method according to claim 4, wherein said determination condition is Ts≥T2And whether the step of the compressor-free anti-freezing operation is established also comprises the step of judging whether the conditions are met for the first time, if so, an intermittent operation mode of firstly operating the circulating water pump and then stopping the operation and repeating the operation is adopted, and if not, the circulating water pump is operated in a mode opposite to the above mode.
6. The antifreeze control method according to claim 4, wherein said determination condition is Ts＜T3Whether the step is established or not further comprises the step of judging whether the started heat pump unit has a fault or not, and if so, starting an electric heating element for heating the temperature of water in a circulating water path between the heat pump unit and a user use side; at the placeThe judgment condition is Ts＜T3In the step of judging whether the temperature is satisfied, the value of the standby heating target temperature is T4。
7. The antifreeze control method according to claim 3, wherein said determination condition is TS≥T4The step of determining whether the result is true further comprises the step of determining whether T is satisfiedS≥T4When the condition (2) is satisfied, it is determined that the condition (T) is continuously satisfiedS≥T4If the time is more than or equal to the preset duration time, the anti-freezing control mode can be exited only if the two conditions are met simultaneously; to satisfy the condition TS≥T4When the mode (2) exits the anti-freezing control mode, the circulating water pump needs to run for a preset delay time and then stops.
8. The antifreeze control method as set forth in claim 4, wherein said control is based on an outdoor ambient temperature T in said on-board unit power-on statehjBefore the step of judging whether to start the anti-freezing control mode, if T is obtained on the heat pump unithjTemperature sensor of (2) is out of order and is shut down and Ts＜T2Temporal or temporal evolution of T for heat pump unitsSTemperature sensor of (2) is out of order and is shut down and Thj＜T1And when the heat pump unit is stopped due to other faults, starting the circulating water pump and continuously running until the heat pump unit is powered off.
9. A processor, characterized in that the processor is configured to run a program, wherein the program when running performs the steps in the control method of any one of claims 1 to 8.
10. The utility model provides an air-source heat pump hot water system, includes at least one heat pump set, its characterized in that, every heat pump set on be equipped with outdoor ambient temperature sensor, every heat pump set and user use the side between be equipped with inlet tube and outlet pipe, every the inlet tube on be equipped with into water temperature sensor, every the outlet pipe on be equipped with out water temperature sensor, be equipped with circulating water pump and electric heating member on at least one in all inlet tubes and the outlet pipe to and treater, memory and storage are in computer program on the memory, the treater be claim 9 the treater.
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| CN115247891A (en) * | 2022-06-28 | 2022-10-28 | 浙江中广电器集团股份有限公司 | Anti-freezing control method for heat pump water heater |
| CN115900134A (en) * | 2022-11-16 | 2023-04-04 | 珠海格力电器股份有限公司 | Multi-heat-pump module unit and anti-freezing control method thereof |
| CN118499982A (en) * | 2024-05-23 | 2024-08-16 | 深圳市派沃新能源科技股份有限公司 | Low-temperature heat pump unit with outage freeze-proof function |
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| CN118499982A (en) * | 2024-05-23 | 2024-08-16 | 深圳市派沃新能源科技股份有限公司 | Low-temperature heat pump unit with outage freeze-proof function |
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