CN114992778B - Anti-freezing control method of air conditioning unit - Google Patents
Anti-freezing control method of air conditioning unit Download PDFInfo
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- CN114992778B CN114992778B CN202210567333.7A CN202210567333A CN114992778B CN 114992778 B CN114992778 B CN 114992778B CN 202210567333 A CN202210567333 A CN 202210567333A CN 114992778 B CN114992778 B CN 114992778B
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- water
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- circulation loop
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000007710 freezing Methods 0.000 title claims abstract description 32
- 238000004378 air conditioning Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 295
- 239000003507 refrigerant Substances 0.000 claims abstract description 62
- 238000001704 evaporation Methods 0.000 claims abstract description 53
- 239000000498 cooling water Substances 0.000 claims abstract description 44
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 38
- 230000008020 evaporation Effects 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims description 48
- 230000002528 anti-freeze Effects 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 31
- 230000008014 freezing Effects 0.000 claims description 12
- 239000008236 heating water Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 10
- 238000004321 preservation Methods 0.000 description 5
- 206010060904 Freezing phenomenon Diseases 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to the technical field of air conditioners, and particularly provides an anti-freezing control method of an air conditioning unit. Aims at solving the problem of poor antifreezing mode of the existing air conditioning unit. The air conditioning unit comprises a chilled water circulation loop, a cooling water circulation loop, a first water diversion branch, a second water diversion branch, a refrigerant circulation loop, a flooded evaporator, a compressor, a condenser and an electronic expansion valve, wherein the flooded evaporator, the compressor, the condenser and the electronic expansion valve are arranged on the refrigerant circulation loop; the anti-freezing control method can selectively communicate the first water diversion branch according to the outdoor environment temperature and the saturated evaporation temperature of the compressor, so that the anti-freezing effect is effectively ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides an anti-freezing control method of an air conditioning unit.
Background
Along with the continuous improvement of the living standard of people, people also put forward higher and higher requirements on living environment. In order to maintain a comfortable ambient temperature, air conditioning units have become an indispensable device in people's life. Generally, an air conditioning unit at least comprises a refrigerant circulation loop, and a compressor, a condenser, an electronic expansion valve and an evaporator which are arranged on the refrigerant circulation loop, wherein a heat exchange medium in the air conditioning unit continuously exchanges heat between the condenser and the evaporator through the refrigerant circulation loop, so that the effect of changing the room temperature is achieved. In the process of heat exchange of the air conditioning unit, the temperature of the evaporator is always in a lower state, so that the evaporator is easy to generate a freezing phenomenon, and then the whole heat exchange process is adversely affected. Particularly, when the ambient temperature is low or the freezing water temperature is too low, the expansion phenomenon of the heat exchange tube of the evaporator can be even directly caused, so that the evaporator is damaged, and the heat exchange process cannot be normally performed, and the flooded evaporator is particularly required to be subjected to anti-freezing protection. When the existing evaporator is frozen or is at risk, the air conditioner unit is controlled to stop running, or a new water circulation heating device is added to realize heating so as to ensure heat exchange, however, the modes are established on the basis that a refrigerant circulation loop stops running, so that the problem of low heat exchange efficiency is necessarily caused.
Accordingly, there is a need in the art for a new method of controlling freeze protection for an air conditioning unit to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problems, namely the problem that the heat exchange efficiency is low due to the fact that the anti-freezing mode of the existing air conditioning unit is poor.
The invention provides an antifreezing control method of an air conditioning unit, which comprises a chilled water circulation loop, a cooling water circulation loop, a first water diversion branch, a second water diversion branch, a refrigerant circulation loop, a flooded evaporator, a compressor, a condenser and an electronic expansion valve which are sequentially arranged on the refrigerant circulation loop,
the chilled water circulation loop is connected with the flooded evaporator to realize heat exchange between chilled water and refrigerant, the cooling water circulation loop is connected with the condenser to realize heat exchange between cooling water and refrigerant,
the first diversion branch is arranged to be capable of guiding the cooling water in the water outlet channel of the cooling water circulation loop to the water inlet channel of the freezing water circulation loop, the second diversion branch is arranged to be capable of guiding the cooling water in the water outlet channel of the cooling water circulation loop to the flooded evaporator,
the anti-freezing control method comprises the following steps:
acquiring an outdoor environment temperature and a saturated evaporation temperature of the compressor;
and selectively communicating the first diversion branch according to the outdoor environment temperature and the saturated evaporation temperature of the compressor.
In the above preferred technical solution of the antifreeze control method, the step of selectively communicating the first diversion branch according to the outdoor ambient temperature and the saturated evaporation temperature of the compressor specifically includes:
and if the outdoor environment temperature is smaller than a first preset outdoor environment temperature or the saturated evaporation temperature of the compressor is smaller than a preset evaporation temperature, communicating the first diversion branch.
In the above preferred technical solution of the antifreeze control method, after the first water diversion branch is communicated for a first preset period of time, the antifreeze control method further includes:
obtaining the outlet water temperature of the chilled water circulation loop;
and selectively heating water in the first water diversion branch and/or communicating and heating the second water diversion branch according to the water outlet temperature of the chilled water circulation loop.
In the above-mentioned preferred technical solution of the antifreeze control method, the step of selectively heating the water in the first water diversion branch and/or communicating and heating the second water diversion branch according to the water outlet temperature of the chilled water circulation loop specifically includes:
and if the water outlet temperature of the chilled water circulation loop is smaller than a first preset water outlet temperature, only heating the water in the first diversion branch.
In the above preferred technical solution of the antifreeze control method, after the step of "heating only the water in the first water diversion branch", the antifreeze control method further includes:
obtaining the outlet water temperature of the chilled water circulation loop again;
if the water outlet temperature of the re-acquired chilled water circulation loop is greater than or equal to a second preset water outlet temperature, stopping heating the water in the first diversion branch;
wherein the second preset outlet water temperature is greater than the first preset outlet water temperature.
In the above-mentioned preferred technical solution of the antifreeze control method, the step of selectively heating the water in the first water diversion branch and/or communicating and heating the second water diversion branch according to the water outlet temperature of the chilled water circulation loop specifically includes:
if the water outlet temperature of the chilled water circulation loop is greater than or equal to the first preset water outlet temperature and less than the second preset water outlet temperature, further acquiring the refrigerant liquid level height in the flooded evaporator;
and selectively heating water in the first water diversion branch and communicating and heating the second water diversion branch according to the refrigerant liquid level height in the flooded evaporator.
In the above preferred technical solution of the antifreeze control method, the step of selectively heating the water in the first water diversion branch and communicating and heating the second water diversion branch according to the refrigerant liquid level height in the flooded evaporator specifically includes:
and if the refrigerant liquid level height in the flooded evaporator is greater than or equal to the preset refrigerant liquid level height, heating water in the first diversion branch and communicating and heating the second diversion branch.
In the above-mentioned preferred technical solution of the antifreeze control method, after the step of "heating the water in the first water diversion branch and communicating and heating the second water diversion branch", the antifreeze control method further includes:
obtaining the outlet water temperature of the chilled water circulation loop and the refrigerant liquid level height in the flooded evaporator again;
and if the water outlet temperature of the chilled water circulation loop obtained again is greater than or equal to the second preset water outlet temperature and the refrigerant liquid level height in the flooded evaporator is smaller than the preset refrigerant liquid level height, stopping heating the water in the first water diversion branch and the second water diversion branch and cutting off the second water diversion branch.
In the above preferred technical solution of the antifreeze control method, in the case where the first water diversion branch is connected, the antifreeze control method further includes:
acquiring the outdoor environment temperature and the saturated evaporation temperature of the compressor again;
and selectively cutting off the first water diversion branch according to the re-acquired outdoor environment temperature and the saturated evaporation temperature of the compressor.
In the above preferred technical solution of the antifreeze control method, the step of selectively cutting off the first water diversion branch according to the re-acquired outdoor ambient temperature and saturated evaporation temperature of the compressor specifically includes:
if the outdoor environment temperature is greater than or equal to a second preset outdoor environment temperature and the saturated evaporating temperature of the compressor is greater than or equal to the preset evaporating temperature, cutting off the first water diversion branch;
wherein the second preset outdoor ambient temperature is greater than the first preset outdoor ambient temperature.
Under the condition that the technical scheme is adopted, the air conditioning unit comprises a chilled water circulation loop, a cooling water circulation loop, a first water diversion branch, a second water diversion branch, a refrigerant circulation loop, a flooded evaporator, a compressor, a condenser and an electronic expansion valve which are sequentially arranged on the refrigerant circulation loop, wherein the chilled water circulation loop is connected with the flooded evaporator to realize heat exchange of chilled water and refrigerant, the cooling water circulation loop is connected with the condenser to realize heat exchange of the cooling water and the refrigerant, the first water diversion branch is arranged to be capable of guiding cooling water in a water outlet channel of the cooling water circulation loop into a water inlet channel of the chilled water circulation loop, and the second water diversion branch is arranged to be capable of guiding cooling water in the water outlet channel of the cooling water circulation loop into the flooded evaporator; based on the structural arrangement mode, the cooling water with higher temperature is introduced by additionally arranging the first water diversion branch and the second water diversion branch, so that the heat generated by the air conditioning unit is effectively utilized to realize the anti-freezing effect, and the heat exchange efficiency of the air conditioning unit can be effectively ensured while the anti-freezing effect is realized; the anti-freezing control method of the invention comprises the following steps: acquiring an outdoor environment temperature and a saturated evaporation temperature of the compressor; selectively communicating the first water diversion branch according to the outdoor ambient temperature and the saturated evaporation temperature of the compressor; based on the setting of the control mode, the invention can automatically communicate with the first water diversion branch according to the outdoor environment temperature and the saturated evaporation temperature of the compressor, thereby effectively realizing the automatic control of the antifreezing process, further ensuring the antifreezing effect and simultaneously effectively ensuring the timeliness of the antifreezing treatment.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the overall structure of an air conditioning unit according to the present invention;
FIG. 2 is a flow chart of the main steps of the antifreeze control method of the present invention;
FIG. 3 is a flowchart of the specific steps of a preferred embodiment of the antifreeze control method of the present invention;
reference numerals:
11. a refrigerant circulation circuit; 111. a flooded evaporator; 1111. a heat preservation layer; 112. a compressor; 113. a condenser; 114. an electronic expansion valve;
12. a chilled water circulation loop; 121. a chilled water inlet passage; 122. a chilled water outlet passage;
13. a cooling water circulation circuit; 131. a cooling water inlet channel; 132. a cooling water outlet channel;
14. a first water diversion branch; 141. a first electromagnetic valve; 142. a second electromagnetic valve; 143. a heating device; 144. an antifreezing water pump;
15. a second water diversion branch; 151. and a third solenoid valve.
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 merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can adapt it as desired to suit a particular application. For example, the air conditioning unit in the invention can be a commercial air conditioning unit or a household air conditioning unit. Such changes as to the application object do not deviate from the basic principle of the invention and fall within the protection scope of the invention.
It should be noted that, in the description of the preferred embodiment, unless explicitly stated and limited otherwise, the term "connected" should be interpreted broadly, for example, as being directly connected, indirectly connected through an intermediate medium, or connected internally between two elements, and thus should not be interpreted as limiting the invention. Furthermore, the terms "first", "second" are used for descriptive purposes only, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to the specific circumstances.
Furthermore, it should be noted that in the description of the present invention, although the respective steps of the control method of the present invention are described in a specific order in the present application, these orders are not limitative, but a person skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention.
Referring to fig. 1, as shown in fig. 1, the air conditioning unit of the present invention includes a refrigerant circulation loop 11, and a flooded evaporator 111, a compressor 112, a condenser 113 and an electronic expansion valve 114 sequentially disposed on the refrigerant circulation loop 11, wherein the refrigerant continuously circulates between the flooded evaporator 111 and the condenser 113 through the refrigerant circulation loop 11 to realize heat exchange. It should be noted that, the specific structure of the refrigerant circulation circuit 11 and the specific types of the flooded evaporator 111, the compressor 112, the condenser 113 and the electronic expansion valve 114 are not limited in the present invention, and those skilled in the art can set the refrigerant circulation circuit according to actual use requirements; for example, a four-way valve for reversing can be further arranged on the refrigerant circulation loop 11; for another example, the compressor 112 may be a fixed-frequency compressor or a variable-frequency compressor.
Further, the air conditioning unit of the present invention includes a chilled water circulation loop 12 and a cooling water circulation loop 13, wherein the chilled water circulation loop 12 is connected to the flooded evaporator 111 to exchange heat between chilled water and refrigerant, and the cooling water circulation loop 13 is connected to the condenser 113 to exchange heat between cooling water and refrigerant. It should be noted that, the specific arrangement modes of the chilled water circulation loop 12 and the cooling water circulation loop 13 are not limited in the present invention, so long as the corresponding heat exchange effect can be achieved, and the chilled water circulation loop 12 and the cooling water circulation loop 13 may be closed loops or open loops, and specific structures of the chilled water circulation loop 12 and the cooling water circulation loop 13 may be set by a person skilled in the art according to actual use requirements. Referring to the orientation of fig. 1, in this embodiment, water in the chilled water circulation loop 12 enters the flooded evaporator 111 through the chilled water inlet channel 121 located below, exchanges heat with the refrigerant flowing through the flooded evaporator 111, and then flows out through the chilled water outlet channel 122 located above. Preferably, a heat insulating layer 1111 is provided in a cavity formed between the outer layer and the inner layer of the flooded evaporator 111, in which heat insulating cotton is filled, and liquid water may be introduced into the heat insulating layer 1111, thereby achieving a heat insulating effect. The water in the cooling water circulation circuit 13 enters the condenser 113 through the cooling water inlet channel 131 positioned below, exchanges heat with the refrigerant flowing through the condenser 113, and then flows out through the cooling water outlet channel 132 positioned above.
In addition, with continued reference to fig. 1, the air conditioning unit of the present invention further includes a first diversion branch 14 and a second diversion branch 15, where the first diversion branch 14 is configured to divert the cooling water in the water outlet channel of the cooling water circulation loop 13 into the water inlet channel of the chilled water circulation loop 12, and the second diversion branch 15 is configured to divert the cooling water in the water outlet channel of the cooling water circulation loop 13 into the flooded evaporator 111. It should be noted that, the specific arrangement modes of the first diversion branch 14 and the second diversion branch 15 are not limited in the present invention, and those skilled in the art can set the arrangement modes according to actual use requirements. As a preferred arrangement, the lower end of the first water diversion branch 14 is communicated with the cooling water outlet channel 132, and the upper end of the first water diversion branch 14 is communicated with the chilled water inlet channel 121, so that water in the cooling water outlet channel 132 can be diverted into the chilled water inlet channel 121, and the temperature of water entering the flooded evaporator 111 can be effectively increased, so that an antifreezing effect is achieved from the viewpoint of increasing the water inlet temperature. The first water diversion branch 14 is provided with a first electromagnetic valve 141 and a second electromagnetic valve 142, the first electromagnetic valve 141 and the second electromagnetic valve 142 are used for controlling the on-off state of the first water diversion branch 14, a heating device 143 and an anti-freezing water pump 144 are further arranged between the first electromagnetic valve 141 and the second electromagnetic valve 142, the heating device 143 can heat water flowing in the first water diversion branch 14, the anti-freezing water pump 144 can provide power for water conveying, and of course, the specific types of the heating device 143 and the anti-freezing water pump 144 are not limited. The left end of the second water diversion branch 15 is connected to the first water diversion branch 14, and the connection point thereof is located at the upper end position (i.e. the downstream position) of the second electromagnetic valve 142, the right end of the second water diversion branch 15 is connected to the flooded evaporator 111, preferably to a cavity formed between the outer layer and the inner layer of the flooded evaporator 111, so as to better play a role in heat preservation, of course, the second water diversion branch 15 can also be connected to a heat exchange water cavity of the flooded evaporator 111, the specific connection position is not limited, and the second water diversion branch 15 is provided with a third electromagnetic valve 151 to control the on-off state of the second water diversion branch 15. Based on this preferred arrangement, the first water diversion branch 14 and the second water diversion branch 15 may share the heating device 143 and the antifreeze water pump 144 to reduce the unit cost, however, the second water diversion branch 15 may also be separately arranged, and the second water diversion branch 15 may be further provided with another heating device and water pump, which are not limited, and may be set by a person skilled in the art according to the actual use requirement.
In addition, the air conditioning unit of the present invention further includes an outdoor ambient temperature sensor for detecting an outdoor ambient temperature, a water flow sensor for detecting a water flow in the first water diversion branch 14 so as to ensure stability of the water flow during water diversion, an evaporation pressure sensor for detecting an evaporation pressure of the compressor 112 to calculate a corresponding saturated evaporation temperature thereof, a liquid level sensor capable of detecting a refrigerant liquid level in the flooded evaporator 111, and a controller capable of acquiring detection results of the outdoor ambient temperature sensor, the water flow sensor, the evaporation pressure sensor, and the liquid level sensor, and also capable of controlling an operation mode of the air conditioning unit, for example, an opening and closing state of the first, second, and third solenoid valves 141, 142, and 151, and an operation state of the heating device 143 and the antifreeze water pump 144. It will be understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be an original controller of the air conditioning unit or a controller separately provided for executing the anti-freezing control method of the present invention, and those skilled in the art may set the structure and model of the controller according to actual use requirements.
Referring next to fig. 2, fig. 2 is a flow chart of main steps of the antifreeze control method of the present invention. As shown in fig. 2, based on the air conditioning unit described in the above embodiment, the antifreeze control method of the present invention mainly includes the following steps:
s1: acquiring outdoor environment temperature and saturated evaporation temperature of a compressor;
s2: and selectively communicating the first water diversion branch according to the outdoor environment temperature and the saturated evaporation temperature of the compressor.
Specifically, in step S1, the controller can acquire the outdoor ambient temperature and the saturated evaporating temperature of the compressor 112, so as to determine the possibility of the freezing phenomenon of the flooded evaporator 111 based thereon. It should be noted that the present invention is not limited in any way to obtain the outdoor environment temperature and the saturated evaporating temperature of the compressor 112, and those skilled in the art can set the present invention according to the actual use requirements.
Next, in step S2, the controller may selectively communicate with the first water diversion branch 14 according to the outdoor environment temperature and the saturated evaporation temperature of the compressor 112, so as to timely perform an anti-freezing treatment on the flooded evaporator 111 when the flooded evaporator 111 is at risk of freezing, thereby effectively ensuring the reliability of the flooded evaporator 111. Of course, the present invention is not limited in any way, and a person skilled in the art can set the present invention according to the actual requirement, so long as the first diversion branch 14 is selectively connected according to the outdoor environment temperature and the saturated evaporating temperature of the compressor 112, which falls within the protection scope of the present invention.
Referring next to fig. 3, fig. 3 is a flowchart showing the specific steps of a preferred embodiment of the antifreeze control method of the present invention. As shown in fig. 3, based on the air conditioning unit described in the above embodiment, the antifreeze control method of the preferred embodiment of the present invention includes the steps of:
s101: acquiring outdoor environment temperature and saturated evaporation temperature of a compressor;
s102: judging whether the outdoor environment temperature is smaller than a first preset outdoor environment temperature or whether the saturated evaporation temperature is smaller than a preset evaporation temperature; if yes, step S103 is performed; if not, executing step S101 again;
s103: communicating the first water diversion branch;
s104: obtaining the outlet water temperature of a chilled water circulation loop;
s105: if the water outlet temperature of the chilled water circulation loop is smaller than the first preset water outlet temperature, only heating water in the first diversion branch;
s106: obtaining the outlet water temperature of the chilled water circulation loop again;
s107: if the water outlet temperature of the re-acquired chilled water circulation loop is greater than or equal to the second preset water outlet temperature, stopping heating the water in the first water diversion branch;
s108: if the water outlet temperature of the chilled water circulation loop is greater than or equal to the first preset water outlet temperature and less than the second preset water outlet temperature, further acquiring the refrigerant liquid level height in the flooded evaporator;
s109: if the refrigerant liquid level height in the flooded evaporator is greater than or equal to the preset refrigerant liquid level height, heating water in the first water diversion branch and communicating and heating the second water diversion branch;
s110: obtaining the outlet water temperature of the chilled water circulation loop and the refrigerant liquid level height in the flooded evaporator again;
s111: if the water outlet temperature of the re-obtained chilled water circulation loop is greater than or equal to the second preset water outlet temperature and the refrigerant liquid level height is smaller than the preset refrigerant liquid level height, stopping heating water in the first water diversion branch and the second water diversion branch and cutting off the second water diversion branch;
s112: acquiring the outdoor environment temperature and the saturated evaporation temperature of the compressor again;
s113: and if the outdoor environment temperature is greater than or equal to the second preset outdoor environment temperature and the saturated evaporation temperature of the compressor is greater than or equal to the preset evaporation temperature, cutting off the first water diversion branch.
Further, in step S101, the controller can obtain the outdoor environment temperature and the saturated evaporation temperature of the compressor 112, so as to determine the possibility of the freezing phenomenon of the flooded evaporator 111 based thereon, and selectively communicate with the first diversion branch 14 according to the outdoor environment temperature and the saturated evaporation temperature of the compressor 112. It should be noted that the present invention is not limited in any way to obtain the outdoor environment temperature and the saturated evaporating temperature of the compressor 112, and those skilled in the art can set the present invention according to the actual use requirements.
Next, in step S102, the controller can determine whether the outdoor environment temperature is less than the first preset outdoor environment temperature or whether the saturated evaporating temperature of the compressor 112 is less than the preset evaporating temperature, so that the freezing prevention process can be performed in time when the freezing risk of the flooded evaporator 111 is likely to occur, so that as long as one of the above two determination conditions is satisfied, it is determined that the freezing risk of the flooded evaporator 111 exists and an anti-freezing measure is correspondingly taken, that is, the first water diversion branch 14 is communicated to raise the water inlet temperature of the flooded evaporator 111, thereby effectively alleviating the freezing phenomenon. It should be noted that, the specific values of the first preset outdoor environment temperature and the preset evaporation temperature are not limited in the invention, and can be set by a person skilled in the art according to actual use requirements; preferably, the first preset outdoor environment temperature is 1 ℃, and the preset evaporation temperature is 4 ℃, so as to effectively improve the accuracy of the judgment result.
Based on the determination result of step S102, if the outdoor environment temperature is less than the first preset outdoor environment temperature or the saturated evaporating temperature of the compressor 112 is less than the preset evaporating temperature, step S103 is performed, i.e. the first water diversion branch 14 is connected, and based on the structural setting in the preferred embodiment, the first electromagnetic valve 141, the second electromagnetic valve 142 and the antifreeze water pump 144 are controlled to be opened so as to introduce the cooling water with higher temperature into the chilled water inlet channel 121, thereby improving the inlet water temperature of the flooded evaporator 111, and thus effectively reducing the freezing risk.
Then, after the first water diversion branch 14 is communicated for a first preset period of time, step S104 is performed, namely, the water outlet temperature of the chilled water circulation loop 12, that is, the temperature of water in the chilled water outlet channel 122 is obtained, so as to effectively judge the freezing condition in the flooded evaporator 111, and further selectively heat the water in the first water diversion branch 14 and/or communicate with and heat the second water diversion branch 15 according to the water outlet temperature of the chilled water circulation loop 12, so as to reduce the freezing risk to the greatest extent and improve the heat exchange efficiency. It should be noted that, the specific value of the first preset duration is not limited in the present invention, and a person skilled in the art can set the value according to the actual use requirement; preferably, the first preset duration is 30 seconds.
In steps S105 to S107, if the outlet water temperature of the chilled water circulation loop 12 is less than the first preset outlet water temperature, only the water in the first water diversion branch 14 is heated so as to effectively secure a heating effect and a heating speed, thereby maximizing an anti-freezing effect. Then, the controller can acquire the outlet water temperature of the chilled water circulation loop 12 again so as to effectively judge the timing to stop heating. If the water outlet temperature of the re-acquired chilled water circulation loop 12 is greater than or equal to the second preset water outlet temperature, stopping heating the water in the first water diversion branch 14 so as to effectively save the energy consumption of the unit; wherein the second preset outlet water temperature is greater than the first preset outlet water temperature. It should be noted that, the specific values of the first preset water outlet temperature and the second preset water outlet temperature are not limited in the invention, and can be set by a person skilled in the art according to actual use requirements; preferably, the first preset water outlet environmental temperature is 4 ℃, and the second preset water outlet temperature is 9 ℃, so that accuracy of the judging result is effectively improved.
In steps S106 to S111, if the outlet water temperature of the chilled water circulation loop 12 is greater than or equal to the first preset outlet water temperature and less than the second preset outlet water temperature, it is indicated that there is still a certain freezing risk of the flooded evaporator 111, so the controller needs to further obtain the refrigerant level height in the flooded evaporator 111, so as to effectively determine whether the flooded evaporator 111 has a further heat preservation requirement, that is, selectively heat the water in the first water diversion branch 14 and connect and heat the second water diversion branch 15 according to the refrigerant level height in the flooded evaporator 111. Then, if the refrigerant liquid level in the flooded evaporator 111 is greater than or equal to the preset refrigerant liquid level, it is determined that the flooded evaporator 111 has a further heat preservation requirement, in this case, the water in the first water diversion branch 14 is heated, the second water diversion branch 15 is also communicated and heated, that is, the third electromagnetic valve 151 is also opened, a part of the cooling water heated by the heating device 143 is introduced into the heat exchange water cavity of the flooded evaporator 111, and a part of the cooling water is introduced into the heat preservation layer of the flooded evaporator 111, so that the evaporation efficiency of the flooded evaporator 111 can be assisted to be improved while freezing is prevented, and further the heat exchange efficiency of the whole unit is effectively improved. After that, the controller acquires again the outlet water temperature of the chilled water circulation loop 12 and the refrigerant level height in the flooded evaporator 111; if the obtained water outlet temperature of the chilled water circulation loop 12 is greater than or equal to the second preset water outlet temperature and the refrigerant liquid level height in the flooded evaporator 111 is less than the preset refrigerant liquid level height, heating of the water in the first water diversion branch 14 and the second water diversion branch 15 is stopped and the second water diversion branch 15 is cut off, and the heating device 143 and the third electromagnetic valve 151 are closed correspondingly. It should be noted that, the specific value of the preset refrigerant liquid level height is not limited in the invention, and the present invention can be set by the person skilled in the art according to the actual use requirement; preferably, the preset refrigerant liquid level is 50mm, so that accuracy of the judging result is effectively improved. It is further preferred that step S112 is performed after the second preset time period is ended in step S111, that is, the heating device 143 and the third solenoid valve 151 are closed for the second preset time period, and then the outdoor ambient temperature and the saturated evaporating temperature of the compressor 112 are obtained again, so as to effectively improve the judging efficiency, and the second preset time period is preferably set to 30 seconds, so that the judging timeliness can be ensured while the judging efficiency is ensured.
Further, based on the result of the step S104, if the outlet water temperature of the chilled water circulation loop 12 is greater than or equal to the second preset outlet water temperature, the step S112 is directly performed to determine the timing of cutting off the first water diversion branch 14.
Further, in step S112, the controller can acquire the outdoor ambient temperature and the saturated evaporation temperature of the compressor 112 again, so as to determine the cut-off timing of the first water diversion branch 14 according to the acquired outdoor ambient temperature and the saturated evaporation temperature of the compressor 112 again. In step S113, if the outdoor ambient temperature is greater than or equal to the second preset outdoor ambient temperature and the saturated evaporating temperature of the compressor 112 is greater than or equal to the preset evaporating temperature, the first water diversion branch 14 is cut off; wherein the second preset outdoor ambient temperature is greater than the first preset outdoor ambient temperature. It should be noted that, the specific value of the second preset outdoor environment temperature is not limited in the present invention, as long as the second preset outdoor environment temperature is set to be greater than the first preset outdoor environment temperature, and a person skilled in the art can set the second preset outdoor environment temperature according to the actual use requirement; the second preset outdoor environment temperature is preferably 3 ℃, so that accuracy of the judging result is effectively improved.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (9)
1. An antifreezing control method for an air conditioning unit is characterized in that the air conditioning unit comprises a chilled water circulation loop, a cooling water circulation loop, a first diversion branch, a second diversion branch, a refrigerant circulation loop, a flooded evaporator, a compressor, a condenser and an electronic expansion valve which are sequentially arranged on the refrigerant circulation loop,
the chilled water circulation loop is connected with the flooded evaporator to realize heat exchange between chilled water and refrigerant, the cooling water circulation loop is connected with the condenser to realize heat exchange between cooling water and refrigerant,
the first diversion branch is arranged to be capable of guiding the cooling water in the water outlet channel of the cooling water circulation loop to the water inlet channel of the freezing water circulation loop, the second diversion branch is arranged to be capable of guiding the cooling water in the water outlet channel of the cooling water circulation loop to the flooded evaporator,
the anti-freezing control method comprises the following steps:
acquiring an outdoor environment temperature and a saturated evaporation temperature of the compressor;
and if the outdoor environment temperature is smaller than a first preset outdoor environment temperature or the saturated evaporation temperature of the compressor is smaller than a preset evaporation temperature, communicating the first diversion branch.
2. The antifreeze control method of claim 1, wherein after said first water diversion branch is communicated for a first preset period of time, said antifreeze control method further comprises:
obtaining the outlet water temperature of the chilled water circulation loop;
and selectively heating water in the first water diversion branch and/or communicating and heating the second water diversion branch according to the water outlet temperature of the chilled water circulation loop.
3. The antifreeze control method according to claim 2, wherein the step of selectively heating the water in the first water diversion branch and/or communicating and heating the second water diversion branch according to the water outlet temperature of the chilled water circulation circuit specifically includes:
and if the water outlet temperature of the chilled water circulation loop is smaller than a first preset water outlet temperature, only heating the water in the first diversion branch.
4. The antifreeze control method of claim 3, wherein after the step of "heating only the water in the first water diversion branch", the antifreeze control method further comprises:
obtaining the outlet water temperature of the chilled water circulation loop again;
if the water outlet temperature of the re-acquired chilled water circulation loop is greater than or equal to a second preset water outlet temperature, stopping heating the water in the first diversion branch;
wherein the second preset outlet water temperature is greater than the first preset outlet water temperature.
5. The antifreeze control method according to claim 2, wherein the step of selectively heating the water in the first water diversion branch and/or communicating and heating the second water diversion branch according to the water outlet temperature of the chilled water circulation circuit specifically further comprises:
if the water outlet temperature of the chilled water circulation loop is greater than or equal to the first preset water outlet temperature and less than the second preset water outlet temperature, further acquiring the refrigerant liquid level height in the flooded evaporator;
and selectively heating water in the first water diversion branch and communicating and heating the second water diversion branch according to the refrigerant liquid level height in the flooded evaporator.
6. The antifreeze control method of claim 5, wherein the step of selectively heating water in said first water diversion branch and communicating and heating said second water diversion branch based on the refrigerant level height in said flooded evaporator, specifically comprises:
and if the refrigerant liquid level height in the flooded evaporator is greater than or equal to the preset refrigerant liquid level height, heating water in the first diversion branch and communicating and heating the second diversion branch.
7. The antifreeze control method of claim 6, wherein after the step of heating the water in said first water diversion branch and communicating and heating said second water diversion branch, said antifreeze control method further comprises:
obtaining the outlet water temperature of the chilled water circulation loop and the refrigerant liquid level height in the flooded evaporator again;
and if the water outlet temperature of the chilled water circulation loop obtained again is greater than or equal to the second preset water outlet temperature and the refrigerant liquid level height in the flooded evaporator is smaller than the preset refrigerant liquid level height, stopping heating the water in the first water diversion branch and the second water diversion branch and cutting off the second water diversion branch.
8. The antifreeze control method according to any one of claims 1 to 7, characterized in that in the case where the first water diversion branch is communicated, the antifreeze control method further comprises:
acquiring the outdoor environment temperature and the saturated evaporation temperature of the compressor again;
and selectively cutting off the first water diversion branch according to the re-acquired outdoor environment temperature and the saturated evaporation temperature of the compressor.
9. The antifreeze control method of claim 8, wherein the step of selectively shutting off said first water diversion branch based on said outdoor ambient temperature and said saturated evaporating temperature of said compressor acquired again, specifically comprises:
if the outdoor environment temperature is greater than or equal to a second preset outdoor environment temperature and the saturated evaporating temperature of the compressor is greater than or equal to the preset evaporating temperature, cutting off the first water diversion branch;
wherein the second preset outdoor ambient temperature is greater than the first preset outdoor ambient temperature.
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| CN202210567333.7A CN114992778B (en) | 2022-05-23 | 2022-05-23 | Anti-freezing control method of air conditioning unit |
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| CN114992778A (en) | 2022-09-02 |
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