CN109163410B - Refrigerant heat dissipation anti-condensation control method and heat pump system - Google Patents

Refrigerant heat dissipation anti-condensation control method and heat pump system Download PDF

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Publication number
CN109163410B
CN109163410B CN201810942426.7A CN201810942426A CN109163410B CN 109163410 B CN109163410 B CN 109163410B CN 201810942426 A CN201810942426 A CN 201810942426A CN 109163410 B CN109163410 B CN 109163410B
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refrigerant
temperature
pipe section
heat dissipation
fin
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CN109163410A (en
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郭来红
张驰
朱海涛
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
    • H05K7/20281—Thermal management, e.g. liquid flow control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air

Abstract

A refrigerant heat dissipation anti-condensation control method comprises the following steps: during heating, sampling the outlet water temperature T of the heat pump systemwoOutdoor ambient temperature TaAnd the temperature T of the cooling pipe section of the refrigerantfin(ii) a Comparing the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaTo determine whether there is a risk of condensation; if the condensation risk exists, the temperature T of the cooling medium radiating pipe section is judgedfinWhether an intervention condition is met; if the intervention condition is met, the refrigerant heat dissipation pipe section is cut off and the refrigerant is guided to circulate along a refrigerant branch in parallel connection with the refrigerant heat dissipation pipe section until the temperature T of the refrigerant heat dissipation pipe sectionfinWhen the temperature rises and does not meet the intervention condition any more, the refrigerant branch is cut off and the refrigerant is guided to flow along the refrigerant heat dissipation pipe section. A heat pump system is also disclosed. The invention can avoid condensation at the cooling pipe section of the refrigerant under the actual operation working condition of heating operation, higher environmental temperature and lower water outlet temperature, and can not sacrifice the actual operation capability of the unit.

Description

Refrigerant heat dissipation anti-condensation control method and heat pump system
Technical Field
The invention relates to a refrigerant heat dissipation anti-condensation control method and a heat pump system applying the control method.
Background
In a traditional heat pump system, an air cooling technology is adopted to dissipate heat of an electric appliance box, and redundant heat generated in the working process of an electronic element is taken away through air circulation. The air cooling heat dissipation effect is not satisfactory, the heat dissipation efficiency is low, and additional parts are required to occupy the machine body space. In the prior art, a refrigerant heat dissipation mode is gradually adopted for replacement, and redundant heat is taken away through circulation of refrigerants in a system, so that the utilization rate of the refrigerants is improved, and the heat dissipation efficiency is also improved.
The air source heat pump water chiller-heater unit has the following special working condition in the operation process: when heating, the outdoor environment temperature is relatively high, and the water inlet temperature and the water outlet temperature are low. Under such operation conditions, the temperature of the refrigerant pipe for heat dissipation may be lower than the dew point temperature corresponding to the outdoor environment temperature, which further causes the formation of condensed water at the refrigerant pipe. The accumulated condensed water may come into contact with the electric control in the electric box to cause a circuit failure.
When refrigerant heat dissipation is applied to an air conditioning system, the prior art provides a solution to the condensation problem. As disclosed in chinese patent application (publication No. CN 107560007A): acquiring a current operation mode of the air conditioning system, and acquiring the temperature of a refrigerant radiating pipe and the air dew point temperature around a frequency conversion module; acquiring the condensation degree of the refrigerant radiating pipe according to the temperature of the refrigerant radiating pipe and the air dew point temperature around the frequency conversion module; and adjusting the opening degree of the outdoor throttling element, the opening degree of the indoor throttling element, the air speed of the outdoor fan and the operating frequency of the compressor according to the current operating mode of the air conditioning system and the condensation degree of the refrigerant radiating pipe so as to eliminate the condensation on the refrigerant radiating pipe. It is easy to see that the above solution is to adjust the opening degree of the throttling element according to the condensation degree and adjust the wind speed and the frequency in a matching way. In the process of eliminating the condensation, the practical capacity of the unit is inevitably influenced. Moreover, when intervening, condensation has already been formed, and if the control effect does not reach the ideal condensation removal effect, the risk that condensed water enters the electronic control main board of the frequency conversion module still exists.
In summary, the refrigerant heat dissipation anti-condensation control method in the prior art has the problems that the actual capacity of the unit needs to be sacrificed, and condensation is formed when intervention is performed.
Disclosure of Invention
The invention provides a refrigerant heat dissipation anti-condensation control method, which is used for solving the problems that the actual capacity of a unit needs to be sacrificed and condensation is formed when intervention is performed in the prior art.
A refrigerant heat dissipation anti-condensation control method comprises the following steps:
during heating, sampling the outlet water temperature T of the heat pump systemwoOutdoor ambient temperature TaAnd the temperature T of the cooling pipe section of the refrigerantfin；
Comparing the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaTo determine whether there is a risk of condensation;
if the condensation risk exists, the temperature T of the cooling medium radiating pipe section is judgedfinWhether an intervention condition is met;
if the intervention condition is met, the refrigerant heat dissipation pipe section is cut off and the refrigerant is guided to circulate along a refrigerant branch in parallel connection with the refrigerant heat dissipation pipe section until the temperature T of the refrigerant heat dissipation pipe sectionfinAnd when the temperature rises and does not meet the intervention condition any more, stopping the refrigerant branch and guiding the refrigerant to flow along the refrigerant heat dissipation pipe section.
The invention can avoid condensation at the cooling pipe section of the refrigerant under the actual operation working condition of heating operation, higher environmental temperature and lower water outlet temperature, and can not sacrifice the actual operation capability of the unit.
Also disclosed is a heat pump system comprising:
a sampling module for sampling the outlet water temperature T of the heat pump system under the heating conditionwoOutdoor ambient temperature TaAnd the temperature T of the cooling pipe section of the refrigerantfin；
A condensation risk judgment module for comparing the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaTo determine whether there is a risk of condensation;
an intervention condition judgment module for judging the temperature T of the cooling medium radiating pipe section when the condensation risk existsfinWhether an intervention condition is met; and
the control module is used for controlling the refrigerant heat dissipation pipe section to be cut off and guiding the refrigerant to circulate along the refrigerant branch in parallel connection with the refrigerant heat dissipation pipe section until the refrigerant is cold when the intervention condition is metTemperature T of radiating pipe sectionfinAnd when the temperature rises and does not meet the intervention condition any more, stopping the refrigerant branch and guiding the refrigerant to flow along the refrigerant heat dissipation pipe section.
The heat pump system disclosed by the invention can effectively prevent condensation formed on the cooling medium radiating pipe section.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart illustrating an embodiment of a method for controlling cooling medium heat dissipation and condensation prevention disclosed in the present invention;
FIG. 2 is a flowchart illustrating an embodiment of a method for controlling cooling medium heat dissipation and condensation prevention disclosed in the present invention;
FIG. 3 is a flowchart of an embodiment of a method for controlling cooling medium heat dissipation and condensation prevention disclosed in the present invention;
FIG. 4 is a functional block diagram of a heat pump system disclosed herein;
FIG. 5 is a functional block diagram of the intervention condition determination module of FIG. 4;
fig. 6 is a schematic structural diagram of a heat pump system to which the refrigerant heat dissipation anti-condensation control method disclosed by the present invention is applied;
FIG. 7 is a schematic diagram of the control logic for the first solenoid valve of FIG. 6;
fig. 8 is a control logic diagram of the second solenoid valve of fig. 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart illustrating a first embodiment of a method for controlling cooling medium heat dissipation and condensation prevention, specifically including the following steps:
step S101, starting the system.
And step S102, the system works in a heating condition according to the current operating environment or a signal set by a user.
Step S103, collecting the outlet water temperature T of the heat pump systemwoOutdoor ambient temperature TaAnd temperature T of refrigerant heat dissipation pipe sectionfin(ii) a Wherein, the temperature T of the cooling medium heat dissipation pipe sectionfinCollected by a temperature sensor arranged on the refrigerant heat dissipation pipe section.
Step S104, comparing the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaTo determine whether there is a risk of condensation. If the heat pump system is in a heating working condition that the outdoor environment temperature is high and the water inlet and outlet temperatures are low, the temperature of the refrigerant radiating pipe section may be lower than the dew point temperature of the outdoor environment, and then condensation occurs on the refrigerant radiating pipe section. Therefore, in the present embodiment, the outlet water temperature T of the heat pump system is comparedwoAnd outdoor ambient temperature TaIt is determined whether there is a risk of condensation, i.e. that condensation may occur after a certain operating time. Particularly, when the temperature T of the outlet water of the heat pump system is higher than the temperature T of the outlet waterwoLess than or equal to outdoor environment temperature TaWhen the temperature of the outlet water of the heat pump system is higher than the temperature T, the condensation risk is judged to existwoGreater than the outdoor ambient temperature TaAnd if so, judging that the condensation risk does not exist.
Step S105, if there is condensation risk, further determining the temperature T of the cooling medium radiating pipe sectionfinIf it is too low, i.e. if the intervention conditions are fulfilled. If the intervention condition is met, the system actively intervenes to prevent the refrigerant radiating pipe section from forming condensation.
Step S106, specifically, in the present embodiment, if the temperature T of the heat dissipation pipe section of the refrigerantfinIf the intervention condition is met, the refrigerant radiating pipe section is cut off and the refrigerant edge and the refrigerant are guidedThe refrigerant branch in parallel connection with the radiating pipe section circulates, the refrigerant circulation does not pass through the refrigerant radiating pipe section any more, and the temperature of the refrigerant radiating pipe section can be gradually increased until the temperature T of the refrigerant radiating pipe sectionfinAnd stopping the refrigerant branch and guiding the refrigerant to flow along the refrigerant heat dissipation pipe section when the intervention condition is not met, and gradually reducing the temperature of the refrigerant heat dissipation part.
Step S107, if the temperature T of the cooling medium heat dissipation pipe sectionfinIf the intervention condition is not met, the refrigerant branch is cut off and the refrigerant is guided to flow along the refrigerant heat dissipation pipe section, so that normal heat dissipation is performed.
By the mode, the system can be effectively controlled, condensation at the cooling medium radiating pipe section is avoided under the actual operation working conditions of heating operation, higher environmental temperature and lower water outlet temperature, the actual operation capacity of the unit is not sacrificed in the control process disclosed by the embodiment, and the control method has the advantages of quick system response, simplicity, practicability and higher practicability.
Fig. 2 is a flowchart illustrating a second embodiment of a refrigerant heat dissipation anti-condensation control method disclosed in the present invention, and the second embodiment discloses a preferred intervention mode in the presence of condensation risk.
Steps S201 to S204 of the second embodiment are the same as steps S101 to S104 of the first embodiment, and the aforementioned steps refer to the detailed description of the first embodiment, which is not repeated herein.
When the refrigerant radiating pipe section is judged to have the condensation risk, the method further comprises the following steps:
step S205, determining the temperature T of the heat dissipation pipe section of the refrigerantfinThe trend of change of (c).
Step S206, according to the temperature T of the cooling medium radiating pipe sectionfinGenerates the outdoor ambient temperature threshold Tamax. If the temperature T of the cooling medium heat dissipation pipe sectionfinIn the rising trend, the outdoor environment temperature threshold value TamaxIs the outdoor ambient temperature TaAnd the sum of the first corrected temperature. When the temperature T of the cooling medium heat dissipation pipe sectionfinBelow outdoor ambient temperature threshold TamaxWhen the refrigerant heat dissipation pipe section is judged to be in the condensation risk critical state, the intervention condition is met, and the refrigerant heat dissipation pipe section needs to enterAnd performing active intervention control. And when the temperature T of the refrigerant heat dissipation pipe sectionfinWhen the temperature is in a descending trend, the outdoor environment temperature threshold T of the outdoor environment isamaxI.e. the outdoor ambient temperature TaThat is, when the temperature T of the heat dissipating pipe section of the refrigerant is highfinBelow outdoor ambient temperature threshold TamaxI.e. outdoor ambient temperature TaAnd then, the refrigerant radiating pipe section is judged to be in the condensation risk critical state, and the intervention condition is met. The intervention condition matched with the temperature change trend of the two refrigerant radiating pipe sections can be set, so that the problem that the system oscillation is influenced by frequent action of valve banks for controlling the refrigerant radiating pipe sections and the refrigerant branches when the temperature of the refrigerant radiating pipe sections fluctuates nearby the intervention condition can be effectively avoided. Temperature T of refrigerant heat dissipation pipe sectionfinThe change trend of (c) is obtained by sampling at intervals, and the sampling period is preferably set within a numerical range of (20 s, 60 s). The first correction temperature may be set according to system characteristics, and is preferably set to 5 degrees celsius.
Step S207, if the temperature T of the cooling medium heat dissipation pipe sectionfinIs in ascending trend and is lower than outdoor environment temperature threshold TamaxI.e. less than the outdoor ambient temperature TaAnd the sum of the first correction temperature and the first correction temperature is considered to meet the matched intervention condition, and the system controls the corresponding valve group to stop the refrigerant radiating pipe section and guide the refrigerant to circulate along the refrigerant branch circuits connected in parallel with the refrigerant radiating pipe section. Similarly, if the refrigerant dissipates the heat pipe section temperature TfinIs in a descending trend and is lower than the outdoor environment temperature threshold value TamaxI.e. less than the outdoor ambient temperature TaAnd if the matched intervention condition is met, the system controls the corresponding valve group to stop the refrigerant radiating pipe section and guide the refrigerant to circulate along the refrigerant branch circuits connected in parallel with the refrigerant radiating pipe section. After the refrigerant heat dissipation pipe section is cut off, the temperature of the refrigerant heat dissipation pipe section gradually rises. When the temperature rises to be more than or equal to the corresponding outdoor environment temperature threshold value TamaxAnd when the condition is satisfied, judging that the intervention condition is not satisfied any more.
And step S208, when the system does not meet the intervention condition, the system controls the corresponding valve group to stop the refrigerant branch and guide the refrigerant to flow along the refrigerant heat dissipation pipe section, and the normal refrigerant heat dissipation working state is recovered. To avoid the systemOscillation, outdoor ambient temperature threshold T in one on-off control process of valve groupamaxAnd is not changed.
Fig. 3 is a flowchart illustrating a second embodiment of a method for controlling cooling medium heat dissipation and condensation prevention according to the present invention, which includes the following steps:
step S301, starting the system, controlling a first electromagnetic valve arranged on a refrigerant branch to keep a cut-off state, and simultaneously controlling a second electromagnetic valve arranged on a refrigerant heat dissipation pipe section to keep a conducting state. The electromagnetic valve has stable structure and is an ideal valve group for cutting off and conducting the refrigerant heat dissipation pipe section and the refrigerant branch. Of course, other valve sets can be used to achieve the same technical effect if special requirements are present in the system. The refrigerant branch is connected with the refrigerant heat dissipation pipe section in parallel, a refrigerant inlet of the refrigerant branch is arranged at the upstream of the refrigerant heat dissipation pipe section, and a refrigerant outlet of the refrigerant branch is arranged at the downstream of the refrigerant heat dissipation pipe section.
And step S3010, if the system works in the refrigerating working condition according to the environmental condition or the user setting, determining that the risk of condensation does not exist.
Step S3011, keep the first solenoid valve on the refrigerant branch off, turn on the second solenoid valve on the refrigerant heat spreading pipe section, and the system is in a normal refrigerant heat dissipation state. Until the refrigeration working condition is exited or the system is shut down.
Step S302, if the system works in the heating working condition according to the environmental condition or the user setting, further control is carried out.
Step S303, collecting the outlet water temperature T of the heat pump systemwoOutdoor ambient temperature TaAnd temperature T of refrigerant heat dissipation pipe sectionfin(ii) a Wherein, the temperature T of the cooling medium heat dissipation pipe sectionfinCollected by a temperature sensor arranged on the refrigerant heat dissipation pipe section.
Step S304, comparing the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaTo determine whether there is a risk of condensation. If the heat pump system is in a heating working condition that the outdoor environment temperature is high and the water inlet temperature and the water outlet temperature are low, the temperature of the refrigerant heat dissipation pipe section may be lower than the dew point temperature of the outdoor environment, so that the refrigerant heat dissipation pipe section is dischargedCondensation occurs. Therefore, in the present embodiment, the outlet water temperature T of the heat pump system is comparedwoAnd outdoor ambient temperature TaAnd judging whether condensation risks exist or not. Particularly, when the temperature T of the outlet water of the heat pump system is higher than the temperature T of the outlet waterwoLess than or equal to outdoor environment temperature TaWhen the temperature of the outlet water of the heat pump system is T, the condensation risk is considered to existwoGreater than the outdoor ambient temperature TaThen, the risk of condensation is considered to be absent.
Step S3042, if it is determined that there is no condensation risk, the first solenoid valve disposed on the refrigerant branch is kept off, and the second solenoid valve disposed on the refrigerant heat dissipation pipe section is turned on.
Step S305, if the condensation risk is judged to exist, the temperature T of the cooling medium radiating pipe section is further judgedfinThe trend of change of (c).
Step S306, according to the temperature T of the cooling pipe section of the refrigerantfinGenerates the outdoor ambient temperature threshold Tamax. If the temperature T of the cooling medium heat dissipation pipe sectionfinIn the rising trend, the outdoor environment temperature threshold value TamaxIs the outdoor ambient temperature TaAnd the sum of the first corrected temperature. When the temperature T of the cooling medium heat dissipation pipe sectionfinBelow outdoor ambient temperature threshold TamaxAnd when the refrigerant heat dissipation pipe section is judged to be in a condensation risk critical state, active intervention control is required. And when the temperature T of the refrigerant heat dissipation pipe sectionfinWhen the temperature is in a descending trend, the outdoor environment temperature threshold T of the outdoor environment isamaxI.e. the outdoor ambient temperature TaThat is, when the temperature T of the heat dissipating pipe section of the refrigerant is highfinBelow outdoor ambient temperature threshold TamaxI.e. outdoor ambient temperature TaAnd then, the refrigerant radiating pipe section is judged to be in the critical state of condensation risk. The intervention condition matched with the temperature change trend of the two refrigerant radiating pipe sections can be set, so that the problem that the system oscillation is influenced by frequent action of valve banks for controlling the refrigerant radiating pipe sections and the refrigerant branches when the temperature of the refrigerant radiating pipe sections fluctuates nearby the intervention condition can be effectively avoided. Temperature T of refrigerant heat dissipation pipe sectionfinIs obtained by sampling at intervals, and the sampling period is preferably (20 s, 60 s)Is set within the numerical range of (1). The first correction temperature may be set according to system characteristics, and is preferably set to 5 degrees celsius.
Step S307, if the temperature T of the cooling medium heat dissipation pipe sectionfinIs in ascending trend and is lower than outdoor environment temperature threshold TamaxI.e. less than the outdoor ambient temperature TaAnd the sum of the first correction temperature, the matching intervention condition is considered to be fulfilled, similarly, if the refrigerant heat dissipation section temperature TfinIs in a descending trend and is lower than the outdoor environment temperature threshold value TamaxI.e. less than the outdoor ambient temperature TaThen the matching intervention condition is also considered satisfied.
And step S308, when the intervention condition is met, the system controls a first electromagnetic valve arranged on the refrigerant heat dissipation pipe section to be closed, and controls a second electromagnetic valve arranged on the refrigerant branch to be opened. The refrigerant no longer flows through the refrigerant heat dissipation pipe section, the temperature of the refrigerant heat dissipation pipe section gradually rises, and in the rising process, the system continuously compares the temperature T of the refrigerant heat dissipation pipe sectionfinAnd an outdoor ambient temperature threshold TamaxWhen the temperature of the cooling medium heat dissipation pipe section is TfinGreater than or equal to outdoor environment temperature threshold TamaxAnd when the refrigerant cooling pipe is in a closed state, the first electromagnetic valve arranged on the refrigerant cooling pipe section is controlled to be switched on, and the second electromagnetic valve arranged on the refrigerant branch is controlled to be switched off. In the process of controlling the first electromagnetic valve and the second electromagnetic valve to be closed once, the outdoor environment temperature threshold value TamaxNo change occurred.
Step S309, if the intervention condition is not met, the system controls a second electromagnetic valve arranged on the refrigerant radiating pipe section to maintain a conducting state, and controls a first electromagnetic valve arranged on the refrigerant branch to maintain a stopping state.
The invention also discloses a heat pump system. The heat pump system specifically includes:
a sampling module for sampling the outlet water temperature T of the heat pump system under the heating conditionwoOutdoor ambient temperature TaAnd the temperature T of the cooling pipe section of the refrigerantfin；
A condensation risk judgment module for comparing the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaTo determine whether there is a risk of condensation. If the heat pump system is in a heating working condition that the outdoor environment temperature is high and the water inlet and outlet temperatures are low, the temperature of the refrigerant radiating pipe section may be lower than the dew point temperature of the outdoor environment, and then condensation occurs on the refrigerant radiating pipe section. Therefore, the condensation risk judgment module compares the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaAnd judging whether condensation risks exist or not. Particularly, when the temperature T of the outlet water of the heat pump system is higher than the temperature T of the outlet waterwoLess than or equal to outdoor environment temperature TaWhen the temperature of the outlet water of the heat pump system is T, the condensation risk is considered to existwoGreater than the outdoor ambient temperature TaThen, the risk of condensation is considered to be absent.
An intervention condition judgment module for judging the temperature T of the cooling medium radiating pipe section when the condensation risk existsfinWhether the intervention condition is satisfied. If the temperature T of the cooling medium heat dissipation pipe sectionfinAnd if the content is too low, the intervention condition is considered to be met. Otherwise, the intervention condition is not satisfied.
The control module is used for controlling the refrigerant heat dissipation pipe section to be cut off and guiding the refrigerant to circulate along a refrigerant branch in parallel connection with the refrigerant heat dissipation pipe section until the temperature T of the refrigerant heat dissipation pipe sectionfinAnd when the temperature rises and does not meet the intervention condition any more, stopping the refrigerant branch and guiding the refrigerant to flow along the refrigerant heat dissipation pipe section.
The heat pump system disclosed by the invention can avoid condensation at the cooling pipe section of the refrigerant under the actual operation working conditions of heating operation, higher ambient temperature and lower water outlet temperature, and the actual operation capacity of the unit can not be sacrificed.
Specifically, the intervention condition determination module includes:
a variation trend determination unit for determining the temperature T of the cooling medium heat radiation pipe sectionfinThe trend of change of (c).
An intervention condition generation unit for generating an intervention condition according to the temperature T of the cooling pipe section of the refrigerantfinThe trend of change generates an intervention condition. Specifically, the intervention condition generating unit is used for radiating the pipe according to the refrigerantSection temperature TfinGenerates the outdoor ambient temperature threshold Tamax. If the temperature T of the cooling medium heat dissipation pipe sectionfinIn the rising trend, the outdoor environment temperature threshold value TamaxIs the outdoor ambient temperature TaAnd the sum of the first corrected temperature. When the temperature T of the cooling medium heat dissipation pipe sectionfinBelow outdoor ambient temperature threshold TamaxAnd then, the intervention condition judgment module judges that the refrigerant heat dissipation pipe section is in a condensation risk critical state and needs active intervention control. And when the temperature T of the refrigerant heat dissipation pipe sectionfinWhen the temperature is in a descending trend, the outdoor environment temperature threshold T of the outdoor environment isamaxI.e. the outdoor ambient temperature TaThat is, when the temperature T of the heat dissipating pipe section of the refrigerant is highfinBelow outdoor ambient temperature threshold TamaxI.e. outdoor ambient temperature TaAnd then, the intervention condition judging module judges that the refrigerant heat dissipation pipe section is in a condensation risk critical state. The intervention condition generating unit sets the intervention condition matched with the temperature change trend of the two refrigerant radiating pipe sections, so that the problem that the system is affected by system oscillation caused by frequent action of valve banks for controlling the refrigerant radiating pipe sections and the refrigerant branches when the temperature of the refrigerant radiating pipe sections fluctuates near the intervention condition can be effectively avoided. Temperature T of refrigerant heat dissipation pipe sectionfinThe change trend of (c) is obtained by sampling at intervals, and the sampling period is preferably set within a numerical range of (20 s, 60 s). The first correction temperature may be set according to system characteristics, and is preferably set to 5 degrees celsius.
The heat pump system disclosed by the invention can be an air source heat pump system, and a structural schematic diagram of the air source heat pump system is shown in fig. 6. The water supply exchanges heat with the refrigerant pipeline in the plate heat exchanger to transfer heat. In the case of a heating process, the feed water absorbs heat from the coolant in the plate heat exchanger. For detecting the outlet water temperature T of the heat pump systemwoThe water outlet temperature sensor is arranged at the water outlet. Two electronic expansion valves EV1 and EV2 are arranged on the refrigerant loop, and the refrigerant heat dissipation section is arranged between the electronic expansion valve EV1 and the electromagnetic expansion valve EV 2. The temperature of the refrigerant heat dissipation pipe section is relatively constant so as to effectively absorb the heat dissipated by the electric control driving element. The two electronic expansion valves can further ensure that the refrigerant heat dissipation pipe sections are in a state before throttling no matter under a refrigeration working condition or a heating working condition, the temperature of the refrigerant heat dissipation pipe sections is prevented from being too low, the risk of condensation is reduced, and the electronic elements are protected. In the invention, in order to control the flowing state of the refrigerant in the refrigerant radiating pipe section and further avoid condensation under special working conditions, the refrigerant radiating pipe is also provided with a refrigerant branch, and the refrigerant branch is connected with the refrigerant radiating pipe section in parallel. The refrigerant inlet of the refrigerant branch is positioned at the upstream of the refrigerant heat dissipation pipe section, and the refrigerant outlet of the refrigerant branch is positioned at the downstream of the refrigerant heat dissipation pipe section. The refrigerant branch is provided with a first electromagnetic valve SVB1, and the refrigerant heat dissipation pipe section is provided with a second electromagnetic valve SVB 2. In the refrigerant heat dissipation and condensation prevention control process, the control flow of the SVB1 is shown in fig. 7, and the control flow of the SVB2 is shown in fig. 8, wherein T isfinIs shown in the direction of the arrow in the figure, and the dotted line represents TfinThe solid line represents TfinON represents valve ON and OFF represents valve OFF.
Finally, it should be noted that: 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 understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (6)

1. A refrigerant heat dissipation anti-condensation control method is characterized by comprising the following steps:
during heating, sampling the outlet water temperature T of the heat pump systemwoOutdoor ambient temperature TaAnd the temperature T of the cooling pipe section of the refrigerantfin；
Comparing the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaTo determine if there is a risk of condensation, if the heat pump system leaves the water temperature TwoIs less than or equal to outdoorAmbient temperature TaJudging that condensation risk exists;
if the condensation risk exists, the temperature T of the cooling medium radiating pipe section is judgedfinWhether an intervention condition is met;
judging temperature T of refrigerant heat dissipation pipe sectionfinWhen the intervention condition is not met, firstly, the temperature T of the refrigerant heat dissipation pipe section is judgedfinThe variation trend of (2):
if the temperature T of the cooling tube section of the refrigerantfinIn the process of descending, the outdoor environment temperature threshold value TamaxEqual to the current outdoor ambient temperature Ta；
If the temperature T of the cooling tube section of the refrigerantfinIn the rising process, the outdoor environment temperature threshold value TamaxEqual to the current outdoor ambient temperature TaAnd a first correction temperature;
when the temperature T of the cooling medium heat dissipation pipe sectionfinBelow outdoor ambient temperature threshold TamaxIn time, the temperature T of the cooling pipe section of the refrigerant is judgedfinThe intervention condition is met;
if the intervention condition is met, the refrigerant heat dissipation pipe section is cut off and the refrigerant is guided to circulate along a refrigerant branch in parallel connection with the refrigerant heat dissipation pipe section until the temperature T of the refrigerant heat dissipation pipe sectionfinAnd when the temperature rises and does not meet the intervention condition any more, stopping the refrigerant branch and guiding the refrigerant to flow along the refrigerant heat dissipation pipe section.
2. The refrigerant heat dissipation anti-condensation control method according to claim 1, wherein if the intervention condition is satisfied, a first electromagnetic valve arranged on a refrigerant heat dissipation pipe section is controlled to be turned off, and a second electromagnetic valve arranged on a refrigerant branch is controlled to be turned on; and if the intervention condition is not met, controlling the second electromagnetic valve arranged on the refrigerant heat dissipation pipe section to be switched on, and controlling the first electromagnetic valve arranged on the refrigerant branch to be switched off.
3. The refrigerant heat dissipation condensation prevention control method according to claim 2, wherein if it is determined that there is no condensation risk, a first solenoid valve provided on the refrigerant branch is kept off, and a second solenoid valve provided on the refrigerant heat dissipation pipe section is turned on.
4. The refrigerant heat dissipation anti-condensation control method according to claim 3, wherein during cooling, a first solenoid valve provided on the refrigerant branch is kept off, and a second solenoid valve provided on the refrigerant heat dissipation pipe section is turned on.
5. The refrigerant heat dissipation anti-condensation control method according to claim 4, wherein the first correction temperature is 5 ℃.
6. A heat pump system, comprising:
a sampling module for sampling the outlet water temperature T of the heat pump system under the heating conditionwoOutdoor ambient temperature TaAnd the temperature T of the cooling pipe section of the refrigerantfin；
A condensation risk judgment module for comparing the outlet water temperature T of the heat pump systemwoAnd outdoor ambient temperature TaTo determine whether there is a risk of condensation;
an intervention condition judgment module for judging the temperature T of the cooling medium radiating pipe section when the condensation risk existsfinWhether an intervention condition is met; judging temperature T of refrigerant heat dissipation pipe sectionfinWhen the intervention condition is not met, firstly, the temperature T of the refrigerant heat dissipation pipe section is judgedfinThe variation trend of (2): if the temperature T of the cooling tube section of the refrigerantfinIn the process of descending, the outdoor environment temperature threshold value TamaxEqual to the current outdoor ambient temperature Ta(ii) a If the temperature T of the cooling tube section of the refrigerantfinIn the rising process, the outdoor environment temperature threshold value TamaxEqual to the current outdoor ambient temperature TaAnd a first correction temperature;
when the temperature T of the cooling medium heat dissipation pipe sectionfinBelow outdoor ambient temperature threshold TamaxIn time, the temperature T of the cooling pipe section of the refrigerant is judgedfinThe intervention condition is met; and
a control module for controlling the refrigerant heat dissipation pipe section to be cut off and guiding the refrigerant to be combined with the refrigerant heat dissipation pipe section when the intervention condition is satisfiedThe connected refrigerant branches circulate until the temperature T of the refrigerant heat dissipation pipe sectionfinWhen the temperature rises and does not meet the intervention condition any more, the refrigerant branch is cut off and the refrigerant is guided to flow along the refrigerant radiating pipe section;
wherein the intervention condition determining module comprises:
a variation trend determination unit for determining the temperature T of the cooling medium heat radiation pipe sectionfinThe trend of change of (c);
an intervention condition generation unit for generating an intervention condition according to the temperature T of the cooling pipe section of the refrigerantfinThe trend of change generates an intervention condition.
CN201810942426.7A 2018-08-17 2018-08-17 Refrigerant heat dissipation anti-condensation control method and heat pump system Active CN109163410B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101988728A (en) * 2010-11-24 2011-03-23 东南大学 Central air-conditioning control system combining radiation terminal cooling and warming and fresh air
CN203163566U (en) * 2013-02-25 2013-08-28 广东申菱空调设备有限公司 Anti-condensation refrigerant circulation heat pipe system
CN104566835A (en) * 2015-01-27 2015-04-29 珠海格力电器股份有限公司 Control method and control system of condensation prevention of chilled water type air conditioner
CN107152821A (en) * 2017-06-05 2017-09-12 珠海格力电器股份有限公司 Refrigerant radiating master control borad condensation-preventing device, method and air-conditioner set
CN107192043A (en) * 2017-06-21 2017-09-22 青岛海信日立空调系统有限公司 Frequency-variable air conditioner outdoor machine and its frequency-variable module cooling means and device, convertible frequency air-conditioner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101988728A (en) * 2010-11-24 2011-03-23 东南大学 Central air-conditioning control system combining radiation terminal cooling and warming and fresh air
CN203163566U (en) * 2013-02-25 2013-08-28 广东申菱空调设备有限公司 Anti-condensation refrigerant circulation heat pipe system
CN104566835A (en) * 2015-01-27 2015-04-29 珠海格力电器股份有限公司 Control method and control system of condensation prevention of chilled water type air conditioner
CN107152821A (en) * 2017-06-05 2017-09-12 珠海格力电器股份有限公司 Refrigerant radiating master control borad condensation-preventing device, method and air-conditioner set
CN107192043A (en) * 2017-06-21 2017-09-22 青岛海信日立空调系统有限公司 Frequency-variable air conditioner outdoor machine and its frequency-variable module cooling means and device, convertible frequency air-conditioner

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