CN112781273B - Defrosting control method for heat pump system and heat pump system - Google Patents
Defrosting control method for heat pump system and heat pump system Download PDFInfo
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- CN112781273B CN112781273B CN202010252397.9A CN202010252397A CN112781273B CN 112781273 B CN112781273 B CN 112781273B CN 202010252397 A CN202010252397 A CN 202010252397A CN 112781273 B CN112781273 B CN 112781273B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
Abstract
The invention discloses a defrosting control method of a heat pump system and the heat pump system, comprising the following steps: the defrosting condition judgment step is executed and comprises the following steps: detecting outdoor environment temperature Te and detecting water tank temperature T; and calculating the continuous operation time of the compressor according to the outdoor environment temperature Te and the water tank temperature T, comparing the actual operation time of the compressor with the continuous operation time, and judging whether to enter defrosting operation. According to the defrosting control method of the heat pump system, the temperature of the newly added water tank is used as a defrosting judgment condition according to the running characteristics of the air source heat pump water heater, so that the characteristics of the heat pump system are better met, and the defrosting control accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of refrigeration and heating equipment, and particularly relates to a defrosting control method of a heat pump system and the heat pump system.
Background
The refrigerating and heating equipment comprises an air conditioning system and a heat pump system, energy transportation is realized through media, and frost is easily formed on one side absorbing heat when the ambient temperature of the side absorbing heat is lower than the frost point.
The common defrosting control scheme in the existing refrigeration and heating equipment is as follows: the judgment is carried out through three conditions of outdoor environment temperature, coil pipe temperature and compressor running time, and defrosting action is carried out when the three conditions all meet defrosting entering conditions. Since the refrigerating and heating apparatus has various forms: one form is to transport cold or heat from the outdoor environment directly to cool or heat the air in the room, known as an air conditioning system. Another form is to carry heat from the outdoor environment to heat water, known as an air source heat pump system. For a heat pump system, the conditions affecting the frosting of the heat pump system are not only related to the outdoor environment temperature, the coil temperature and the running time of a compressor, but also related to the temperature of heated water, so that the defrosting control of the current heat pump system is still controlled by the three factors, which is obviously not accurate enough.
In addition, the deviation of the ambient temperature and the monitoring of the coil pipe temperature and the amount of refrigerant can influence the defrosting operation of the unit, and the frosting amount cannot be judged according to the operation condition, so that the phenomena of no defrosting, incomplete defrosting and the like exist.
Disclosure of Invention
The invention provides a defrosting control method of a heat pump system, aiming at the technical problem that the existing defrosting judgment of the heat pump system is inaccurate, and the defrosting control method can be used for solving the problem.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
a defrosting control method of a heat pump system comprises the following steps:
the defrosting condition judgment step is executed and comprises the following steps:
detecting outdoor environment temperature Te and detecting water tank temperature T;
and calculating the continuous operation time of the compressor according to the outdoor environment temperature Te and the water tank temperature T, comparing the actual operation time of the compressor with the continuous operation time, and judging whether to enter defrosting operation.
Further, the calculation method of the continuous operation time comprises the following steps:
determining operation reference time according to the outdoor environment temperature Te;
correcting the operation reference time according to the temperature T of the water tank to obtain continuous operation time;
and entering the defrosting operation when the actual operation time of the compressor is not less than the continuous operation time.
Further, the method for determining the operation reference time comprises the following steps:
judging an environment temperature interval where the outdoor environment temperature is located;
searching the operation reference time a corresponding to the environment temperature interval;
wherein, the corresponding relation between the environment temperature interval and the operation reference time is pre-stored in the system.
Further, the calculation method of the continuous operation time comprises the following steps:
judging a water temperature interval in which the water tank temperature is;
searching the operation correction time b corresponding to the water temperature interval;
wherein, the corresponding relation between each water temperature interval and the correction time is pre-stored in the system;
the continuous operation time is the sum of the operation reference time a and the operation correction time b.
And further, after entering defrosting operation, the method also comprises the step of judging whether to exit defrosting, and when the condition of judging whether to exit defrosting is met, the method exits defrosting operation and counts the actual defrosting operation time.
Further, the method for judging whether to quit defrosting comprises the following steps:
and detecting the temperature Tc of the coil and the defrosting operation time t, and quitting the defrosting operation when the Tc is more than or equal to Tcs or t is more than or equal to ts.
Further, after the defrosting operation is quitted, the method also comprises the step of adaptively adjusting defrosting interval time, wherein the defrosting interval time is the time interval from the previous time of quitting the defrosting operation to the next time of executing the defrosting condition judgment step.
Further, the method for adjusting the defrosting interval time comprises the following steps:
determining defrosting reference time A according to the outdoor environment temperature Te;
comparing the actual defrost operating time with a defrost reference time A, adjusting the defrost interval time to a + b-delta when the actual defrost operating time is greater than the defrost reference time, otherwise, the defrost interval time = a + b + delta, wherein,
＞0。
further, the method also comprises the step of correcting the defrosting reference time:
searching the defrosting correction time B corresponding to the water temperature interval;
the corrected defrosting reference time is a + B.
The present invention also provides a heat pump system that performs defrosting control according to any one of the defrosting control methods described above.
Compared with the prior art, the invention has the advantages and positive effects that: according to the defrosting control method of the heat pump system, the temperature of the newly added water tank is used as a defrosting judgment condition according to the running characteristics of the air source heat pump water heater, so that the characteristics of the heat pump system are better met, and the defrosting control accuracy is improved.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of an embodiment of a defrosting control method for a heat pump system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
Example one
Heat pump systems, particularly air-source heat pump systems, are systems that carry heat from the outdoor environment to heat water, which can be used as domestic water or for indoor heating for air conditioning. At the moment, the outdoor heat exchanger is used as an evaporator, when the refrigerant takes away heat, the temperature of the outer surface of the evaporator is reduced, and when the temperature is reduced to be below a frost point, water in air is condensed to frost. The frost layer can influence the heat exchanger to exchange heat, and the load pressure of the system is large, so that the heat pump system needs to be defrosted when the heat pump system is operated in a low-temperature environment.
The defrosting control method for the heat pump system provided by the embodiment belongs to one of judgment logics in normal operation of the system, and before the defrosting operation is started, firstly, the defrosting condition is judged, and the method comprises the following steps:
the defrosting condition judgment step is executed and comprises the following steps:
detecting outdoor environment temperature Te and detecting water tank temperature T;
and calculating the continuous operation time of the compressor according to the outdoor environment temperature Te and the water tank temperature T, comparing the actual operation time of the compressor with the continuous operation time, and judging whether to enter defrosting operation.
In this embodiment, the continuous operation time of the compressor refers to the time of the normal continuous operation (general heating operation) of the heat pump system, and when the normal continuous operation of the compressor meets the continuous operation time, it is considered that a certain amount of frost is formed during the continuous operation, and the normal operation needs to be interrupted, and the defrosting operation is performed, so that the frost layer is prevented from being formed thicker and thicker.
Before the defrosting condition judging step is executed, the method also comprises a reference condition judging step which comprises the following steps:
1. after the compressor is started to operate for a period of time (for example, 4 minutes), the defrosting condition is allowed to be judged, and the system enters stable operation.
2. The coil temperature Tc is less than or equal to Tcs (for example, -5 ℃);
3. the outdoor ambient temperature Te < Tes (e.g., 7 deg.C).
The heat pump system absorbs heat in the surrounding environment during the heating process, the lower the outdoor environment is, the easier the frost point of frost formation can be reached, and after the system is operated for a period of time, the thicker the frost layer is. Therefore, the influence of the outdoor ambient temperature on the frosting is large, and the outdoor ambient temperature is used as a main judgment condition for judging entering the defrosting operation.
The refrigerant carries energy in the outdoor environment to the water tank for heating water in the water tank, the water temperature in the water tank reflects the energy absorption and conversion capacity, the lower the water temperature, the greater the heat absorption capacity, and the lower the temperature of the refrigerant circulating after heat exchange, so when the refrigerant circulates to the outdoor heat exchanger, the higher the capacity of the refrigerant capable of absorbing energy is, and the more easily the refrigerant frosts correspondingly. On the contrary, the higher the temperature of the refrigerant circulated after heat exchange is, the lower the capacity of the refrigerant capable of absorbing energy is when the refrigerant is circulated to the outdoor heat exchanger, and accordingly, the refrigerant is not easy to frost. Therefore, different tank temperatures have an effect on the speed of frost formation, and the conditions for entering defrost should be adjusted accordingly according to the tank temperatures.
Based on this, utilize outdoor ambient temperature Te and water tank temperature T to confirm the continuous operation duration of compressor jointly in this scheme for the judgement that gets into the defrosting operation is more accurate, avoids getting into the defrosting in advance and leads to energy waste, and lags behind and gets into the frosting that the defrosting leads to and reduce heat transfer performance too thickly.
Preferably, the method for calculating the continuous operation time in the present embodiment is as follows:
and determining the operation reference time according to the outdoor environment temperature Te.
The relationship between the outdoor ambient temperature Te and the frost point directly determines whether frosting can occur, and therefore, the outdoor ambient temperature Te is used as a main factor for determining the operation reference time.
And correcting the operation reference time according to the temperature T of the water tank to obtain continuous operation time. Different water tank temperatures have influence on the frosting speed, and the water tank temperature T is used as an auxiliary judgment condition for judging whether to enter the defrosting operation or not and is used for correcting the operation reference time, so that the accuracy of judging whether to enter the defrosting operation is improved.
And entering the defrosting operation when the actual operation time of the compressor is not less than the continuous operation time.
The actual operation time of the compressor refers to the normal continuous operation time of the compressor when the system is in a heating working condition, and the compressor may also operate when the defrosting operation is started, and the actual operation time of the compressor referred to in the embodiment is not counted.
The method for determining the preferred operation reference time in this embodiment is as follows:
judging an environment temperature interval where the outdoor environment temperature is located;
and searching the operation reference time a corresponding to the environment temperature interval.
It can be understood that the environmental temperature is divided into a plurality of sections, in order to reduce the calculation amount, each environmental temperature section corresponds to an operation reference time, the operation reference time can be obtained in a laboratory, and can be pre-stored in the system in a lookup table mode, and when the operation reference time is used, the operation reference time is searched and judged. The method can also be stored in a network server, and the household appliances are searched and obtained by connecting with a network, so that the memory of the household appliances can be saved.
The division number of the environment temperature interval can be determined according to actual needs, and the more the division number of the environment temperature interval is, the more accurate the control precision is.
The formation of frosting is all relevant with temperature, air humidity, according to the natural law of frosting, when outdoor environment temperature is extremely low (be less than certain numerical value below zero), air humidity is lower, is difficult to frosting this moment, can suitably prolong the continuous operation duration of compressor, when outdoor environment temperature is higher, is higher than the frosting point, also does not do benefit to frosting formation equally yet, also can suitably prolong the continuous operation duration of compressor. When the outdoor ambient temperature is near the frost point (for example, -4 ℃ to 5 ℃), the air has certain humidity, the refrigerant absorbs heat from the ambient air, the frost point is easy to reach, the formation of a frost layer is accelerated, the frost layer is easy to form, and the continuous operation time of the compressor is shortened at the moment. Therefore, in this embodiment, the operating reference times corresponding to different ambient temperature values in the same ambient temperature interval are the same, and the operating reference times corresponding to different ambient temperature intervals are compared, so that the ambient temperature is divided into a plurality of ambient temperature intervals from below zero to above zero, and the corresponding operating reference times are regular in length from long to short and then longer. The condition for entering the defrosting operation is more accurate according to the natural law of frosting.
In this embodiment, a preferable method for correcting the operation reference time according to the water tank temperature T is as follows:
and intensively judging the water temperature interval where the water tank temperature is located from the water temperature interval.
Searching the operation correction time b corresponding to the water temperature interval;
it can be understood that the water tank temperature is divided into a plurality of regions, in order to reduce the calculation amount, each water tank temperature corresponds to an operation correction time, the operation correction time can be obtained in a laboratory, and the operation correction time can be pre-stored in a system in a lookup table mode and can be searched and judged when being used. The method can also save the memory of the electric appliance.
The division number of the water tank temperature interval can be determined according to actual needs, and the more the division number of the water tank temperature interval is, the more accurate the control precision is.
The continuous operation time is the sum of the operation reference time a and the operation correction time b.
In the embodiment, the operation correction time corresponding to different water tank temperature values in the same water tank temperature interval is the same. Because the temperature of the water tank is related to the temperature of the refrigerant entering the outdoor heat exchanger, the higher the temperature of the water tank is, the higher the temperature of the refrigerant entering the outdoor heat exchanger is, and the frosting is difficult to occur, and therefore, compared with the operation correction time corresponding to different water tank temperature intervals, the operation correction time corresponding to the water tank temperature interval with the higher temperature of the water tank is longer. The defrosting method can more accurately defrost as required according to the actual frosting condition of the outdoor heat exchanger of the heat pump system.
And after entering the defrosting operation, judging whether the system quits the defrosting operation so as to make the system return to the normal heating operation state again, when the condition of judging whether the system quits the defrosting operation is met, quitting the defrosting operation, and counting the actual defrosting operation time.
In this embodiment, the defrosting condition is preferably determined by using the coil temperature Tc and the defrosting operation time t, and specifically, the defrosting quitting determination method includes:
and detecting the temperature Tc of the coil and the defrosting operation time t, and quitting the defrosting operation when the Tc is more than or equal to Tcs or t is more than or equal to ts. Tcs and ts may be set to any value greater than 0.
When the system operates and carries out the defrosting condition judgment for the first time, the judgment can be carried out according to the defrosting condition judgment step, when the primary defrosting operation is finished or the defrosting is carried out again later, the defrosting operation is quitted each time, the defrosting interval time is adjusted in a self-adaptive mode, and the defrosting interval time is the time interval from the time of quitting the defrosting operation for the last time to the time of carrying out the defrosting condition judgment step for the next time.
The method for adjusting the defrosting interval time in the embodiment comprises the following steps:
determining defrosting reference time A according to the outdoor environment temperature Te;
comparing the actual defrost operating time with a defrost reference time A, adjusting the defrost interval time to a + b-delta when the actual defrost operating time is greater than the defrost reference time, otherwise, the defrost interval time = a + b + delta, wherein,
＞0。
the defrosting reference time A is determined as theoretical defrosting time according to the outdoor environment temperature Te, the actual defrosting operation time is actual defrosting operation time according to judgment conditions of entering defrosting and exiting defrosting, and if the actual defrosting operation time is larger than the theoretical defrosting time determined according to the outdoor environment temperature, the environment is severe and frosting is easy to occur, so that the defrosting interval time should be shortened. Otherwise, the defrost interval is extended. Defrosting is carried out according to the actual frosting condition, and the phenomena of non-defrosting, non-defrosting, incomplete defrosting and the like in the unit are avoided.
In order to improve the precision of the defrosting reference time, the influence of the temperature factor of the water tank is taken into consideration, so the method also comprises the step of correcting the defrosting reference time:
searching the defrosting correction time B corresponding to the water temperature interval;
the corrected defrosting reference time is A + B.
Generally, the defrosting interval time should be no less than 30 minutes and no more than 120 minutes.
When the compressor is stopped and restarted due to failure or power failure, the judgment is started after the compressor is operated for a set time (such as 10 min), when Tc is less than or equal to Tcs (such as minus 5 ℃), the defrosting operation is firstly carried out for the set time, then the operation is carried out according to the primary defrosting control, otherwise, the operation is directly carried out according to the primary defrosting control. This is to prevent the defrost from being performed immediately before a failure or power outage or not being completed, which would result in a frost layer that is too thick to remove if the defrost is first done as normal after restart.
Example two
The present invention also provides a heat pump system that performs defrosting control according to any one of the defrosting control methods described above.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A defrosting control method for a heat pump system is characterized by comprising the following steps:
the defrosting condition judgment step is executed and comprises the following steps:
detecting outdoor environment temperature Te and detecting water tank temperature T;
calculating the continuous operation time of the compressor according to the outdoor environment temperature Te and the water tank temperature T, comparing the actual operation time of the compressor with the continuous operation time, and judging whether to enter defrosting operation;
the calculation method of the continuous operation time comprises the following steps:
determining operation reference time according to the outdoor environment temperature Te;
correcting the operation reference time according to the water tank temperature T to obtain continuous operation time, wherein the operation correction time is longer in a water tank temperature interval with higher water tank temperature;
and entering the defrosting operation when the actual operation time of the compressor is not less than the continuous operation time.
2. The defrosting control method of a heat pump system according to claim 1, wherein the operation reference time is determined by:
judging an environment temperature interval where the outdoor environment temperature is located;
and searching the operation reference time a corresponding to the environment temperature interval.
3. The defrost control method for a heat pump system according to claim 2, characterized in that the calculation method for the continuous operation time is:
judging a water temperature interval in which the water tank temperature is;
searching the operation correction time b corresponding to the water temperature interval;
the continuous operation time is the sum of the operation reference time a and the operation correction time b.
4. The defrosting control method of the heat pump system according to claim 3, further comprising performing a defrosting exit judgment after entering the defrosting operation, exiting the defrosting operation when the defrosting exit judgment condition is satisfied, and counting the actual defrosting operation time.
5. The heat pump system defrosting control method according to claim 4, wherein the exit defrosting determination method is:
and detecting the temperature Tc of the coil and the defrosting operation time t, and quitting the defrosting operation when the Tc is more than or equal to Tcs or t is more than or equal to ts, wherein Tcs and ts are any numerical values more than 0.
6. The defrosting control method of the heat pump system according to claim 4, further comprising adaptively adjusting a defrosting interval time after the defrosting operation is exited, wherein the defrosting interval time is a time interval from the previous time when the defrosting operation is exited to the next time when the defrosting condition determination step is executed.
7. The heat pump system defrost control method of claim 6,
the defrosting interval time adjusting method comprises the following steps:
determining defrosting reference time A according to the outdoor environment temperature Te;
comparing the actual defrost operating time with a defrost reference time A, adjusting the defrost interval time to a + b-delta when the actual defrost operating time is greater than the defrost reference time, otherwise, the defrost interval time = a + b + delta, wherein,
＞0。
8. the heat pump system defrost control method of claim 7, further comprising the step of correcting a defrost reference time:
searching the defrosting correction time B corresponding to the water temperature interval;
the corrected defrosting reference time is a + B.
9. A heat pump system characterized in that it performs defrosting control according to the defrosting control method described in any one of claims 1 to 8.
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| CN114963291B (en) * | 2021-06-29 | 2023-11-17 | 青岛海尔新能源电器有限公司 | Heating machine control method, device, equipment and storage medium |
| CN116718237B (en) * | 2023-08-10 | 2023-11-03 | 山东毫瓦特新能源有限公司 | Air energy heat pump working data monitoring method |
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| US5797273A (en) * | 1997-02-14 | 1998-08-25 | Carrier Corporation | Control of defrost in heat pump |
| CN109028639B (en) * | 2018-07-03 | 2019-10-22 | 浙江国祥股份有限公司 | A kind of defrosting control method and air source heat pump of air source heat pump |
| CN110017569B (en) * | 2019-04-15 | 2019-12-10 | 宁波工程学院 | Control method of defrosting mode of air conditioner, computer readable storage medium and air conditioner |
| CN110332716B (en) * | 2019-07-16 | 2021-01-15 | 珠海格力电器股份有限公司 | Defrosting control method and device for heat pump water heater and heat pump water heater |
| CN110469981B (en) * | 2019-07-26 | 2022-09-06 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
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