CN113465242A - Defrosting control method of air source heat pump unit - Google Patents
Defrosting control method of air source heat pump unit Download PDFInfo
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- CN113465242A CN113465242A CN202110671910.2A CN202110671910A CN113465242A CN 113465242 A CN113465242 A CN 113465242A CN 202110671910 A CN202110671910 A CN 202110671910A CN 113465242 A CN113465242 A CN 113465242A
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- 238000010257 thawing Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 170
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000003507 refrigerant Substances 0.000 description 13
- 238000004364 calculation method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
Abstract
The invention belongs to the technical field of heat exchange, and particularly relates to a defrosting control method of an air source heat pump unit. The invention aims to solve the problem that the optimal defrosting time of the heat pump unit is difficult to accurately judge by the existing defrosting control method of the heat pump unit. To this end, the defrost control method of the present invention comprises: acquiring the temperature of a coil pipe of the fin type heat exchanger; if the temperature of the coil is less than or equal to the preset temperature of the coil, acquiring the continuous heating time of the air source heat pump unit; if the continuous heating time of the air source heat pump unit is longer than or equal to the preset time, acquiring the actual heating quantity and the theoretical heating quantity of the air source heat pump unit under the current working condition; and selectively controlling the air source heat pump unit to enter a defrosting mode according to the actual heating capacity and the theoretical heating capacity. The invention judges the defrosting time through three parameters together, so as to avoid the interference of irrelevant factors to the maximum extent, ensure the accuracy of the judgment result and further increase the effective heating capacity and energy efficiency of the unit.
Description
Technical Field
The invention belongs to the technical field of heat exchange, and particularly relates to a defrosting control method of an air source heat pump unit.
Background
The air source heat pump unit comprises a refrigerant circulation loop and a water circulation loop, wherein a water side heat exchanger and a condenser are arranged on the refrigerant circulation loop, the water side heat exchanger is a fin type heat exchanger during refrigeration, and the air side heat exchanger is a fin type heat exchanger during heating. Taking the heat pump unit to operate under the heating working condition as an example, the finned heat exchanger is always in a lower temperature state, and the outdoor temperature is also lower; at the moment, if the outdoor environment still has higher humidity and the temperature of the coil pipe is lower than 0 ℃, the fins of the fin type heat exchanger are easy to generate frosting phenomenon, and along with continuous frosting, the heat exchange efficiency of the refrigerant circulation loop is also sharply reduced, so that the heating capacity of the whole heat pump unit is continuously reduced. Therefore, when the heat pump unit operates in a heating working condition, whether the finned heat exchanger has frosted or not needs to be monitored frequently, and a proper time needs to be selected to enter a defrosting mode so as to avoid unnecessary energy loss.
Most of the existing heat pump units judge defrosting time according to heating continuous operation time, coil temperature of a finned heat exchanger and difference between the coil temperature and outdoor ambient temperature, and the judging modes are easily affected by irrelevant factors, so that the problem of inaccurate judging result is caused. Specifically, taking the case of judging through the temperature of the coil of the fin-type heat exchanger as an example, when the humidity of the outdoor environment is low, the unit frosts slowly, the fin frosting is not serious after the unit reaches the preset maximum operation time, at the moment, the temperature of the coil reaches the preset value, but the attenuation of the unit heating capacity is low, and the unit still performs defrosting, so that the heat pump unit performs unnecessary defrosting, unnecessary defrosting times are increased, and the unit heating capacity is wasted; when the outdoor environment humidity is high, after the unit continuously operates for a short time, a large amount of fins are frosted, even the fins are frozen, and the temperature of the coil pipe does not reach the defrosting condition, so that the heating performance of the heat pump unit is greatly reduced, but the heat pump unit does not enter a defrosting mode.
Accordingly, there is a need in the art for a new defrosting control method for an air source heat pump unit to solve the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that the optimal time for the heat pump unit to enter the defrosting mode is difficult to accurately judge by the defrosting control method of the existing heat pump unit, the invention provides a defrosting control method of an air source heat pump unit, wherein the air source heat pump unit comprises a fin type heat exchanger, and the defrosting control method comprises the following steps: acquiring the temperature of a coil of the fin type heat exchanger; if the temperature of the coil is less than or equal to the preset temperature of the coil, acquiring the continuous heating time of the air source heat pump unit at this time; if the continuous heating time of the air source heat pump unit is longer than or equal to the preset time, acquiring the actual heating quantity and the theoretical heating quantity of the air source heat pump unit under the current working condition; and selectively controlling the air source heat pump unit to enter a defrosting mode according to the actual heating capacity and the theoretical heating capacity.
In a preferred technical solution of the above-mentioned defrosting control method, "selectively controlling the air source heat pump unit to enter a defrosting mode according to the actual heating capacity and the theoretical heating capacity" specifically includes: calculating a heating amount attenuation rate based on the actual heating amount and the theoretical heating amount; and selectively controlling the air source heat pump unit to enter a defrosting mode according to the calculated heating quantity attenuation rate.
In a preferred technical solution of the above-mentioned defrosting control method, "selectively controlling the air source heat pump unit to enter a defrosting mode according to the calculated heating amount attenuation rate" specifically includes: and if the heating quantity attenuation rate is greater than the preset attenuation rate, controlling the air source heat pump unit to enter a defrosting mode.
In a preferred embodiment of the above-described defrosting control method, the defrosting control method further includes: and under the condition that the finned heat exchanger is not frosted, acquiring the heating capacity at different outdoor environment temperatures and different outlet water temperatures, and establishing a theoretical heating capacity database of the unit.
In the preferred technical scheme of the defrosting control method, the step of acquiring the theoretical heating capacity of the air source heat pump unit under the current working condition specifically comprises the following steps: acquiring the current outdoor ambient temperature and the current outlet water temperature of the air source heat pump unit; and determining the theoretical heating capacity of the air source heat pump unit under the current working condition based on the unit theoretical heating capacity database and according to the current outdoor ambient temperature and the current outlet water temperature.
In a preferred embodiment of the above-described defrosting control method, the defrosting control method further includes: and fitting the relation between the theoretical heating capacity of the compressor and the suction pressure and the exhaust pressure according to the compressor performance curve of the air source heat pump unit, and establishing a theoretical heating capacity database of the compressor.
In a preferred embodiment of the above-described defrosting control method, the defrosting control method further includes: and determining the achievement rate of the performance of the compressor of the air source heat pump unit under different working conditions according to the unit theoretical heating capacity database and the compressor theoretical heating capacity database, and establishing a compressor achievement rate database.
In the preferred technical scheme of the defrosting control method, the step of acquiring the actual heating capacity of the air source heat pump unit under the current working condition specifically comprises the following steps: acquiring the current suction pressure and the current exhaust pressure of the compressor; and determining the actual heating capacity of the air source heat pump unit under the current working condition based on the current suction pressure, the current exhaust pressure and the compressor achievement rate database.
In the preferred technical solution of the above-mentioned defrosting control method, the step of determining the actual heating capacity of the air source heat pump unit under the current working condition based on the current suction pressure, the current discharge pressure and the compressor achievement rate database specifically includes: determining the theoretical heating capacity of the compressor of the air source heat pump unit under the current working condition based on the theoretical heating capacity database of the compressor and according to the current suction pressure and the current exhaust pressure; determining the compressor achievement rate of the air source heat pump unit under the current working condition based on the compressor achievement rate database; and calculating the product of the theoretical heating capacity of the compressor of the air source heat pump unit under the current working condition and the achievement rate of the compressor, namely the actual heating capacity of the air source heat pump unit under the current working condition.
In a preferred technical solution of the above defrosting control method, the preset coil temperature is determined by: acquiring the current outdoor environment temperature; and determining the temperature of the preset coil according to the current outdoor environment temperature.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, the air source heat pump unit of the present invention includes a fin heat exchanger, and the defrosting control method of the present invention includes: acquiring the temperature of a coil of the fin type heat exchanger; if the temperature of the coil is less than or equal to the preset temperature of the coil, acquiring the continuous heating time of the air source heat pump unit at this time; if the continuous heating time of the air source heat pump unit is longer than or equal to the preset time, acquiring the actual heating quantity and the theoretical heating quantity of the air source heat pump unit under the current working condition; and selectively controlling the air source heat pump unit to enter a defrosting mode according to the actual heating capacity and the theoretical heating capacity. Based on the control mode, the timing of entering the defrosting is judged through three types of parameters together, so that the accuracy of a judgment result is effectively guaranteed, the interference of irrelevant factors is avoided to the maximum extent, and the attenuation judgment of the unit heating capacity is carried out by increasing the actual heating capacity and the theoretical heating capacity, so that the problem that the unit enters the defrosting when the fin type heat exchanger is frosted and the attenuation of the heating capacity is low is effectively solved, the heating time of the unit is increased, the defrosting times of the unit are reduced, and the effective heating capacity and the heating energy efficiency of the unit are effectively increased.
Drawings
FIG. 1 is a flow chart of the main steps of the defrost control method of the present invention;
fig. 2 is a flow chart of a preferred embodiment of the defrost control method of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. It should be noted that in the description of the preferred embodiment, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, and may be, for example, directly connected, indirectly connected through an intermediate, or communicating between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Further, it should be noted that in the description of the present invention, although the steps of the control method of the present invention are described in a specific order in the present application, the order is not limited, and those skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention.
The air source heat pump unit comprises a refrigerant circulation system and a water circulation system, wherein the refrigerant circulation system comprises a refrigerant circulation loop, and a fin type heat exchanger, a compressor, a four-way valve, a condenser and an electronic expansion valve which are sequentially arranged on the refrigerant circulation loop, a refrigerant continuously realizes gas-liquid conversion between the fin type heat exchanger and the condenser through the refrigerant circulation loop to realize heat exchange, and the four-way valve can control the refrigerant reverse circulation in the refrigerant circulation loop when reversing so as to ensure that the air source heat pump unit is converted between a cooling working condition and a heating working condition. The water circulating in the water circulation system exchanges heat with the refrigerant circulating in the refrigerant circulation loop through the fin type heat exchanger so as to carry out heating treatment or cooling treatment on the water, the water after heat exchange treatment can flow into the room, and then exchanges heat with the indoor air through the indoor fan, so that the refrigerating or heating effect is realized. It should be noted that, the present invention does not limit the specific structure of the air source heat pump unit, and the technician can set the configuration according to the actual use requirement.
Furthermore, the air source heat pump unit further comprises a coil pipe temperature sensor, an outlet water temperature sensor and a controller, wherein the coil pipe temperature sensor can detect the temperature of a coil pipe of the fin type heat exchanger, the outlet water temperature can detect the temperature of water flowing through the fin type heat exchanger, the controller can acquire detection data of the coil pipe temperature sensor and the outlet water temperature sensor, and can also control the running state of the air source heat pump unit, such as the communication state of the four-way valve.
It can be understood by those skilled in the art that the present invention does not limit the specific structure and the specific type of the controller, and the controller may be the original controller of the air source heat pump unit, or may be a controller separately configured to execute the defrosting control method of the present invention, and the structure and the type of the controller may be set by those skilled in the art according to the actual use requirement.
Referring first to fig. 1, a flow chart of the main steps of the defrost control method of the present invention is shown. As shown in fig. 1, based on the air source heat pump unit described in the above embodiment, the defrosting control method of the present invention mainly includes the following steps:
s1: acquiring the temperature of a coil pipe of the fin type heat exchanger;
s2: if the temperature of the coil is less than or equal to the preset temperature of the coil, acquiring the continuous heating time of the air source heat pump unit;
s3: if the continuous heating time of the air source heat pump unit is longer than or equal to the preset time, acquiring the actual heating quantity and the theoretical heating quantity of the air source heat pump unit under the current working condition;
s4: and selectively controlling the air source heat pump unit to enter a defrosting mode according to the actual heating capacity and the theoretical heating capacity.
Specifically, in step S1, the controller obtains the coil temperature of the finned heat exchanger through the coil temperature sensor; it should be noted that, the present invention does not limit the specific obtaining manner and obtaining position, and the technician can set the obtaining manner and obtaining position according to the actual use requirement.
Further, in step S2, if the controller determines that the coil temperature is less than or equal to the preset coil temperature, the continuous heating duration of the air source heat pump unit at this time is further obtained.
It should be noted that, the present invention does not limit the specific value of the preset coil temperature, and a technician may set the preset coil temperature according to the actual use requirement, for example, the preset coil temperature may be a constant or a variable.
Next, in step S3, if the controller determines that the current continuous heating time of the air source heat pump unit is greater than or equal to the preset time, acquiring an actual heating capacity and a theoretical heating capacity of the air source heat pump unit under the current working condition; and when the frosting phenomenon does not occur in the fin type heat exchanger, the theoretical heating capacity is the heating capacity of the air source heat pump unit under the current working condition.
It should be noted that, the specific value of the preset time period is not limited, and a technician can set the preset time period according to the actual use requirement, for example, the preset time period may be a constant or a variable; in addition, the invention does not limit the specific obtaining mode of the actual heating capacity and the theoretical heating capacity of the air source heat pump unit under the current working condition, as long as the controller can obtain the actual heating capacity and the theoretical heating capacity of the air source heat pump unit under the current working condition.
Finally, in step S4, the controller selectively controls the air source heat pump unit to enter a defrosting mode according to the actual heating capacity and the theoretical heating capacity, that is, under the condition that the coil temperature is less than or equal to the preset coil temperature and the continuous heating duration of the air source heat pump unit is greater than or equal to the preset duration, the controller further selectively controls the air source heat pump unit to enter the defrosting mode according to the actual heating capacity and the theoretical heating capacity, so as to effectively improve the accuracy of the judgment result.
It should be noted that, the present invention does not limit the specific control manner, and a technician may set the control manner according to actual use requirements, and it is within the protection scope of the present invention to determine the time when the air source heat pump unit enters the defrosting mode according to the actual heating capacity and the theoretical heating capacity only when the coil temperature is less than or equal to the preset coil temperature and the continuous heating time of the air source heat pump unit is greater than or equal to the preset time; for example, the determination may be performed by comparing a magnitude relationship between the actual heating amount and the theoretical heating amount, or may be performed according to a comparison result between a ratio of the actual heating amount and the theoretical heating amount and a preset ratio.
Referring next to fig. 2, a flow chart of a preferred embodiment of the defrost control method of the present invention is shown. As shown in fig. 2, based on the air source heat pump unit described in the above preferred embodiment, the preferred embodiment of the defrosting control method of the present invention specifically includes the following steps:
s101: acquiring the temperature of a coil pipe of the fin type heat exchanger;
s102: judging whether the temperature of the coil is less than or equal to a preset temperature of the coil or not; if yes, executing step S103; if not, executing step S101 again;
s103: acquiring the continuous heating time of the air source heat pump unit;
s104: judging whether the duration is greater than or equal to a preset duration or not; if yes, executing step S105; if not, executing step S101 again;
s105: acquiring the current outdoor environment temperature and the current outlet water temperature of the air source heat pump unit;
s106: determining the theoretical heating capacity of the air source heat pump unit under the current working condition based on the unit theoretical heating capacity database and according to the current outdoor environment temperature and the current outlet water temperature;
s107: acquiring the current suction pressure and the current exhaust pressure of a compressor;
s108: determining the theoretical heating capacity of the compressor of the air source heat pump unit under the current working condition based on the theoretical heating capacity database of the compressor and according to the current suction pressure and the current exhaust pressure;
s109: determining the compressor achievement rate of the air source heat pump unit under the current working condition based on the compressor achievement rate database;
s110: calculating the product of the theoretical heating capacity of the compressor of the air source heat pump unit under the current working condition and the achievement rate of the compressor, namely the actual heating capacity of the air source heat pump unit under the current working condition;
s111: calculating a heating capacity attenuation rate based on the actual heating capacity and the theoretical heating capacity;
s112: and if the heating quantity attenuation rate is greater than the preset attenuation rate, controlling the air source heat pump unit to enter a defrosting mode.
In step S101, the controller obtains a coil temperature of the finned heat exchanger through the coil temperature sensor; it should be noted that, the present invention does not limit the specific obtaining manner and obtaining position of the coil temperature of the finned heat exchanger, and the technician can set the temperature according to the actual use requirement. Next, in step S102, the controller determines whether the coil temperature of the finned heat exchanger is less than or equal to the preset coil temperature, so as to effectively determine the frosting probability of the finned heat exchanger. As a preferred setting mode, the preset coil temperature is determined according to the current outdoor ambient temperature, and the preset coil temperature and the current outdoor ambient temperature are in positive correlation, specifically, the preset coil temperature is 6 ℃ to 8 ℃ lower than the current outdoor ambient temperature. Of course, the above setting mode is only a preferable setting mode, but is not restrictive, and the technician may set the setting mode according to the actual use requirement.
Based on the judgment result of the step S102, if the coil temperature of the finned heat exchanger is greater than the preset coil temperature, performing the step S101 again; and if the coil temperature of the finned heat exchanger is less than or equal to the preset coil temperature, executing step S103 to perform subsequent judgment. In step S103, the controller obtains the continuous heating duration of the air source heat pump unit. Next, in step S104, the controller determines whether the current continuous heating time of the air source heat pump unit is greater than or equal to the preset time. It should be noted that, the specific value of the preset duration is not limited by the present invention, and the technical staff can set the value according to the actual use requirement. Based on the judgment result of the step S104, if the continuous heating time of the air source heat pump unit is shorter than the preset time, executing the step S101 again; and if the continuous heating time of the air source heat pump unit is longer than or equal to the preset time, executing the step S105 so as to improve the operation speed and effectively improve the accuracy of the judgment result.
Before the air source heat pump unit leaves a factory, a unit theoretical heating capacity database, a compressor theoretical heating capacity database and a compressor achievement rate database can be established in advance so as to be used in the subsequent judgment process.
The preferable establishment process of the unit theoretical heating capacity database is as follows: under the condition that the finned heat exchanger is not frosted, technicians perform variable working condition tests of the air source heat pump unit in advance, namely, heating capacities under different outdoor environment temperatures and different water outlet temperatures are obtained, a function relation Q of the heating capacity Q with respect to the outdoor environment temperature Ta and the water outlet temperature Tewo is determined to be f1(Ta, Tewo), and a unit theoretical heating capacity database is established according to the function relation Q. Based on the established theoretical heating capacity database of the unit, the only theoretical heating capacity can be determined according to the obtained current outdoor environment temperature and the current outlet water temperature.
Generally, the functional relation of the heating quantity Q with respect to the outdoor ambient temperature Ta and the leaving water temperature Tewo can be expressed by a two-dimensional cubic equation, and specifically by the following calculation formula:
Q＝a*Ta3+b*Tewo3+c*Ta2*Tewo+d*Ta*Tewo2+e*Ta2
+f*Tewo2+g*Ta*Tewo+h*Ta*Tewo+i
and a, b, c, d, e, f, g, h and i are constant correction coefficients and are determined according to the model of the air source heat pump unit.
The preferable establishment process of the compressor theoretical heating capacity database is as follows: it is needless to say that the compressor performance curve provided by the compressor manufacturer may be a self-measured compressor performance curve, and the compressor theoretical heating capacity database may be created by fitting a functional relation Qcom ═ f2(Ps, Pd) of the compressor theoretical heating capacity Qcom with respect to the suction pressure Ps and the discharge pressure Pd of the compressor. And based on the established theoretical heating capacity database of the compressor, determining the unique heating capacity of the compressor according to the obtained current suction pressure and current exhaust pressure of the compressor.
Generally, the functional relation of the theoretical compressor heating amount Qcom with respect to the suction pressure Ps and the discharge pressure Pd can be expressed by a two-dimensional cubic equation, and specifically by the following calculation formula:
Qcom＝a'*Ps3+b'*Pd3+c'*Ps2*Pd+d'*Ps*Pd2+e'*Ps2+f'*Pd2+g'*Ps*Pd+h'*Ps*Pd+i'
wherein a ', b ', c ', d ', e ', f ', g ', h ' and i ' are constant correction coefficients and are determined according to the model of the air source heat pump unit.
The preferred establishment process of the compressor achievement rate database is as follows: determining the achievement rates of the compressors of the air source heat pump unit under different working conditions according to the established unit theoretical heating capacity database and the compressor theoretical heating capacity database, and establishing a compressor achievement rate database according to the achievement rates; wherein the achievement rate c of the compressor is Q/Qcom.
As a preferable determination, the achievement rate of the compressor may be fitted to a functional relationship c ═ f3(Ta, Tewo) with respect to the outdoor ring temperature Ta and the leaving water temperature Tewo, expressed by a binary quadratic equation, and specifically expressed by the following calculation formula:
c＝a"*Ta2+b"*Tewo2+c"*Ta*Tewo+d"
wherein a ', b', c 'and d' are constant correction coefficients and are determined according to the model of the air source heat pump unit.
Based on the established three databases, in step S105, the controller obtains a current outdoor temperature and a current outlet temperature of the air source heat pump unit; it should be noted that the present invention does not limit the specific obtaining manner, and the skilled person can set the obtaining manner according to the actual use requirement as long as the controller can obtain the current outdoor loop temperature and the current outlet water temperature.
Next, in step S106, based on the established theoretical heating capacity database of the unit, the controller may substitute the obtained current outdoor ambient temperature and the obtained current outlet water temperature to determine the theoretical heating capacity of the air source heat pump unit under the current working condition.
Further, in step S107, the controller obtains a current suction pressure and a current discharge pressure of the compressor, so as to determine an actual heating capacity of the air source heat pump unit under a current working condition based on the current suction pressure and the current discharge pressure; it should be noted that the present invention does not limit the specific obtaining manner, and the skilled person can set the obtaining manner according to the actual use requirement as long as the controller can obtain the current suction pressure and the current discharge pressure. Next, in step S108, based on the established theoretical heating capacity database of the compressor, the controller may substitute the obtained current suction pressure and current discharge pressure to determine the theoretical heating capacity of the compressor of the air source heat pump unit under the current working condition.
In addition, in step S109, based on the established compressor achievement rate database, the controller can determine the compressor achievement rate of the air source heat pump unit under the current operating condition. Next, in step S110, the controller calculates a product of a theoretical heating capacity of the compressor (determined in step S108) and the achievement rate of the compressor (determined in step S109) of the air source heat pump unit under the current operating condition, that is, an actual heating capacity of the air source heat pump unit under the current operating condition.
Based on the results determined in the above steps, the controller can calculate the heating amount attenuation rate based on the actual heating amount (determined according to step S110) and the theoretical heating amount (determined according to step S106) in step S111. It should be noted that, a skilled person can automatically adjust the calculation method of the heating amount attenuation rate according to the actual use requirement. Preferably, the heating amount attenuation rate is calculated by a ratio of a difference between the theoretical heating amount and the actual heating amount to the theoretical heating amount.
Finally, the controller can selectively control the air source heat pump unit to enter a defrosting mode according to the calculated heating quantity attenuation rate, namely, the calculated heating quantity attenuation rate is compared with a preset attenuation rate, and the air source heat pump unit is selectively controlled to enter the defrosting mode according to a comparison result. Specifically, if the heating quantity attenuation rate is greater than the preset attenuation rate, the air source heat pump unit is controlled to enter a defrosting mode; and if the heating quantity attenuation rate is less than or equal to the preset attenuation rate, the air source heat pump unit is not controlled to enter a defrosting mode.
It should be noted that, the present invention does not make any limitation on the specific value of the preset attenuation ratio, and the technical staff can set the value according to the actual use requirement, and the present invention does not make any limitation on the specific operation executed after the air source heat pump unit enters the defrosting mode, and the technical staff can set the value according to the actual use requirement, as long as the defrosting effect can be achieved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the accompanying drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrosting control method of an air source heat pump unit is characterized in that the air source heat pump unit comprises a finned heat exchanger, and the defrosting control method comprises the following steps:
acquiring the temperature of a coil of the fin type heat exchanger;
if the temperature of the coil is less than or equal to the preset temperature of the coil, acquiring the continuous heating time of the air source heat pump unit at this time;
if the continuous heating time of the air source heat pump unit is longer than or equal to the preset time, acquiring the actual heating quantity and the theoretical heating quantity of the air source heat pump unit under the current working condition;
and selectively controlling the air source heat pump unit to enter a defrosting mode according to the actual heating capacity and the theoretical heating capacity.
2. The defrosting control method according to claim 1, wherein the step of selectively controlling the air source heat pump unit to enter the defrosting mode according to the actual heating capacity and the theoretical heating capacity specifically comprises:
calculating a heating amount attenuation rate based on the actual heating amount and the theoretical heating amount;
and selectively controlling the air source heat pump unit to enter a defrosting mode according to the calculated heating quantity attenuation rate.
3. The defrosting control method according to claim 2, wherein the step of selectively controlling the air source heat pump unit to enter the defrosting mode according to the calculated heating amount attenuation rate specifically includes:
and if the heating quantity attenuation rate is greater than the preset attenuation rate, controlling the air source heat pump unit to enter a defrosting mode.
4. The defrost control method of any one of claims 1-3, further comprising:
and under the condition that the finned heat exchanger is not frosted, acquiring the heating capacity at different outdoor environment temperatures and different outlet water temperatures, and establishing a theoretical heating capacity database of the unit.
5. The defrosting control method according to claim 4, wherein the step of obtaining the theoretical heating capacity of the air source heat pump unit under the current working condition specifically comprises:
acquiring the current outdoor ambient temperature and the current outlet water temperature of the air source heat pump unit;
and determining the theoretical heating capacity of the air source heat pump unit under the current working condition based on the unit theoretical heating capacity database and according to the current outdoor ambient temperature and the current outlet water temperature.
6. The defrost control method of claim 4, further comprising:
and fitting the relation between the theoretical heating capacity of the compressor and the suction pressure and the exhaust pressure according to the compressor performance curve of the air source heat pump unit, and establishing a theoretical heating capacity database of the compressor.
7. The defrost control method of claim 6, further comprising:
and determining the achievement rate of the air source heat pump unit under different working conditions according to the unit theoretical heating capacity database and the compressor theoretical heating capacity database, and establishing a compressor achievement rate database.
8. The defrosting control method according to claim 7, wherein the step of obtaining the actual heating capacity of the air source heat pump unit under the current working condition specifically comprises:
acquiring the current suction pressure and the current exhaust pressure of the compressor;
and determining the actual heating capacity of the air source heat pump unit under the current working condition based on the current suction pressure and the current exhaust pressure.
9. The defrosting control method according to claim 8, wherein the step of determining the actual heating capacity of the air source heat pump unit under the current operating condition based on the current suction pressure and the current discharge pressure specifically comprises:
determining the theoretical heating capacity of the compressor of the air source heat pump unit under the current working condition based on the theoretical heating capacity database of the compressor and according to the current suction pressure and the current exhaust pressure;
determining the compressor achievement rate of the air source heat pump unit under the current working condition based on the compressor achievement rate database;
and calculating the product of the theoretical heating capacity of the compressor of the air source heat pump unit under the current working condition and the achievement rate of the compressor, namely the actual heating capacity of the air source heat pump unit under the current working condition.
10. Defrost control method according to any of claims 1-3, characterized in that the preset coil temperature is determined in such a way that:
acquiring the current outdoor environment temperature;
and determining the temperature of the preset coil according to the current outdoor environment temperature.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237258A (en) * | 2021-05-31 | 2021-08-10 | 青岛海尔空调电子有限公司 | Air conditioning unit and defrosting control method thereof |
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Application publication date: 20211001 |