CN113566458A - Air-cooled condensing machine and control method - Google Patents
Air-cooled condensing machine and control method Download PDFInfo
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- CN113566458A CN113566458A CN202110747700.7A CN202110747700A CN113566458A CN 113566458 A CN113566458 A CN 113566458A CN 202110747700 A CN202110747700 A CN 202110747700A CN 113566458 A CN113566458 A CN 113566458A
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- rotating speed
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000007613 environmental effect Effects 0.000 claims description 6
- 238000004781 supercooling Methods 0.000 claims description 6
- 101100108953 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ANY1 gene Proteins 0.000 claims description 3
- 230000005494 condensation Effects 0.000 abstract description 12
- 238000009833 condensation Methods 0.000 abstract description 12
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air-cooled condensing machine and a control method. An air-cooled condenser comprising: a condenser; the input end of the expansion valve is connected with the output end of the condenser; the input end of the evaporator is connected with the output end of the expansion valve; the input end of the compressor is connected to the output end of the evaporator; the temperature sensor is connected to the input end of the expansion valve; and the controllers are electrically connected with the temperature sensor, the condenser and the compressor. This air-cooled condensing engine adopts the combination between temperature sensor, evaporimeter, expansion valve, controller, compressor and the condenser, through acquireing data, calculates required condensation fan rotational speed, and the rotational speed of controlling the condensation fan again adjusts to the calculated value, has realized the prediction to outdoor ambient temperature, and makes condensation pressure and condensation temperature control in the within range of setting for, has promoted the reliability of system operation.
Description
Technical Field
The invention relates to the field of condensers, in particular to an air-cooled condenser and a control method.
Background
The sensors used in the condenser of the air-cooled direct expansion refrigeration system are typically pressure sensors or temperature sensors.
If a pressure sensor is used, the condensing pressure is directly detected, and the rotating speed of the fan is adjusted by the controller according to the difference ratio of the set point of the condensing pressure and the detected condensing pressure, or according to an empirical value. For the air-cooled condenser using the pressure sensor, the sensor is usually installed on a pipeline at the high-pressure side of the air conditioner when an air conditioner manufacturer leaves a factory, the control is relatively simple and reliable, and the air conditioner in a machine room usually uses the mode at present. But the cost of a pressure sensor is typically several times that of a temperature sensor. In addition, the installation of the sensor needs to form a hole on the pipeline, so that the risk of system leakage is increased.
If a temperature sensor is used, the ambient temperature is usually detected, and the controller usually adjusts the fan speed according to an empirical value preset by the system. For air-cooled condensers controlled using temperature sensors, the sensors are typically installed outdoors for sensing the ambient temperature. Because the sensor is arranged outdoors, the temperature of the external environment changes in a magic manner, and the situation that the sensor cannot cope with the temperature change is easily met by using an empirical value control mode, the control reliability of the air conditioner with higher technological requirements, such as a precise air conditioner for a machine room, cannot be ensured generally, and great potential safety hazard exists for the machine room. The air-cooled condenser is usually arranged outdoors, and may be subjected to severe environment to greatly influence the heat exchange effect, and the actual heat exchange condition of the air-cooled condenser cannot be predicted by the existing control method.
Disclosure of Invention
The invention aims to provide an air-cooled condenser and a control method.
The invention aims to solve the problems in the prior art.
Compared with the prior art, the technical scheme and the beneficial effects of the invention are as follows:
an air-cooled condenser comprising: a condenser comprising a condensing fan; the input end of the expansion valve is connected with the output end of the condenser; the input end of the evaporator is connected with the output end of the expansion valve; the input end of the compressor is connected to the output end of the evaporator; the temperature sensor is connected to the input end of the expansion valve; and the controllers are electrically connected with the temperature sensor, the condensing fan and the compressor.
As a further improvement, the temperature sensor is installed indoors.
A control method of an air-cooled condenser comprises the following steps: s1, acquiring two sets of operation data under the same environmental temperature, wherein the operation data comprise: calculating the heat transfer coefficient of the condenser according to the rotating speed of the compressor, the rotating speed of the condensing fan and the temperature before the expansion valve; s2, calculating the environment temperature according to the current temperature before the valve, the supercooling degree, the rotating speed of the compressor, the rotating speed of the condensing fan and the heat transfer coefficient; s3, calculating the required rotating speed of the condensing fan according to the set value of the condensing temperature, the heat transfer coefficient, the environment temperature and the rotating speed of the compressor; and S4, the controller sends a signal to the condensing fan, and the rotating speed of the condensing fan is adjusted to a calculated value of the rotating speed of the condensing fan.
As a further modification, step S1 includes: the operation data comprises the rotating speed CS1/CS2 of the compressor, the rotating speed CFS1/CFS2 of the condensing fan and the temperature CT1/CT2 before the expansion valve, and the heat transfer coefficient KFD of the condenser is calculated as follows:
as a further modification, step S2 includes: according to the current pre-valve temperature CT, the supercooling degree SubCooolSP, the compressor rotating speed CS, the condensing fan rotating speed CFS and the heat transfer coefficient KFD, calculating the environmental temperature TOA:
as a further improvement, the step S3 includes: calculating the required rotating speed CFSPredict of the condensing fan according to the set value CTD of the condensing temperature, the heat transfer coefficient KFD, the ambient temperature TOA and the rotating speed CS of the compressor:
the invention has the beneficial effects that:
this air-cooled condensing engine adopts the combination between temperature sensor, evaporimeter, expansion valve, controller, compressor and the condenser, through acquireing data, calculates required condensation fan rotational speed, and the rotational speed of controlling the condensation fan again adjusts to the calculated value, has realized the prediction to outdoor ambient temperature, and makes condensation pressure and condensation temperature control in the within range of setting for, has promoted the reliability of system operation. The pressure sensor is replaced, the risk of leakage of the opening hole in the pipeline is reduced, and the cost is reduced. The calculated heat transfer coefficient can be used for monitoring the health condition of the air cooling condenser, and the running reliability of the system is improved.
Drawings
Fig. 1 is a schematic structural diagram of an air-cooled condenser according to an embodiment of the present invention.
In the figure:
1. expansion valve 2, evaporator 3, compressor
4. Temperature sensor 5, controller 6, condenser
61. Condensing fan
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, an air-cooled condensing machine includes: a condenser 6; the input end of the expansion valve 1 is connected with the output end of the condenser 6; the input end of the evaporator 2 is connected with the output end of the expansion valve 1; the input end of the compressor 3 is connected to the output end of the evaporator 2; the temperature sensor 4, the said temperature sensor 4 is connected to the input end of the said expansion valve 1; and the controller 5 is electrically connected with the temperature sensor 4, the condenser 6 and the compressor 3. This air-cooled condensing engine adopts temperature sensor 4, evaporimeter 2, expansion valve 1, controller 5, the combination between compressor 3 and the condenser 6, through acquireing data, calculates required condensation fan rotational speed, and the rotational speed of the condensation fan of controlling again adjusts to the calculated value, has realized the prediction to outdoor ambient temperature, and makes the condensation pressure and the condensation temperature control of condenser in the within range of setting for, has promoted the reliability of system operation.
As a further improvement, the condenser 6 includes a condensing fan 61, and the condensing fan 61 is electrically connected to the controller 5.
Note that the temperature sensor 4 is installed indoors and is not affected by the outdoor environment.
A control method of an air-cooled condenser comprises the following steps: s1, acquiring two sets of operation data under the same environmental temperature, wherein the operation data comprise: calculating the heat transfer coefficient of the condenser according to the rotating speed of the compressor, the rotating speed of the condensing fan and the temperature before the expansion valve; s2, calculating the environment temperature according to the current temperature before the valve, the supercooling degree, the rotating speed of the compressor, the rotating speed of the condensing fan and the heat transfer coefficient; s3, calculating the required rotating speed of the condensing fan according to the set value of the condensing temperature, the heat transfer coefficient, the environment temperature and the rotating speed of the compressor; and S4, the controller sends a signal to the condensing fan, and the rotating speed of the condensing fan is adjusted to a calculated value of the rotating speed of the condensing fan.
As a further modification, step S1 includes: the operation data comprises the rotating speed CS1/CS2 of the compressor, the rotating speed CFS1/CFS2 of the condensing fan and the temperature CT1/CT2 before the expansion valve, and the heat transfer coefficient KFD of the condenser is calculated as follows:
as a further modification, step S2 includes: according to the current pre-valve temperature CT, the supercooling degree SubCooolSP, the compressor rotating speed CS, the condensing fan rotating speed CFS and the heat transfer coefficient KFD, calculating the environmental temperature TOA:
as a further improvement, the step S3 includes: calculating the required rotating speed CFSPtredict of the condensing fan according to the set value CTD of the condensing temperature, the heat transfer coefficient KFD, the ambient temperature TOA and the rotating speed CS of the compressor,
the above examples are only for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that any modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims.
Claims (6)
1. An air-cooled condenser, comprising:
a condenser comprising a condensing fan;
the input end of the expansion valve is connected with the output end of the condenser;
the input end of the evaporator is connected with the output end of the expansion valve;
the input end of the compressor is connected to the output end of the evaporator;
the temperature sensor is connected to the input end of the expansion valve;
and the controllers are electrically connected with the temperature sensor, the condensing fan and the compressor.
2. An air-cooled condenser as claimed in claim 1 wherein the temperature sensor is mounted indoors.
3. A control method of an air-cooled condenser is characterized by comprising the following steps:
s1, acquiring two sets of operation data under the same environmental temperature, wherein the operation data comprise: calculating the heat transfer coefficient of the condenser according to the rotating speed of the compressor, the rotating speed of the condensing fan and the temperature before the expansion valve;
s2, calculating the environment temperature according to the current temperature before the valve, the supercooling degree, the rotating speed of the compressor, the rotating speed of the condensing fan and the heat transfer coefficient;
s3, calculating the required rotating speed of the condensing fan according to the set value of the condensing temperature, the heat transfer coefficient, the environment temperature and the rotating speed of the compressor;
and S4, the controller sends a signal to the condensing fan, and the rotating speed of the condensing fan is adjusted to a calculated value of the rotating speed of the condensing fan.
4. The control method of the air-cooled condenser as claimed in claim 3, wherein the step S1 includes:
the operation data comprises the rotating speed CS1/CS2 of the compressor, the rotating speed CFS1/CFS2 of the condensing fan and the temperature CT1/CT2 before the expansion valve, and the heat transfer coefficient KFD of the condenser is calculated as follows:
5. the control method of the air-cooled condenser as claimed in claim 3, wherein the step S2 includes:
according to the current pre-valve temperature CT, the supercooling degree SubCooolSP, the compressor rotating speed CS, the condensing fan rotating speed CFS and the heat transfer coefficient KFD, calculating the environmental temperature TOA:
6. the control method of the air-cooled condenser as claimed in claim 3, wherein the step S3 includes:
calculating the required rotating speed CFSPredict of the condensing fan according to the set value CTD of the condensing temperature, the heat transfer coefficient KFD, the ambient temperature TOA and the rotating speed CS of the compressor:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110747700.7A CN113566458A (en) | 2021-07-01 | 2021-07-01 | Air-cooled condensing machine and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110747700.7A CN113566458A (en) | 2021-07-01 | 2021-07-01 | Air-cooled condensing machine and control method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121848A (en) * | 1994-10-27 | 1996-05-17 | Matsushita Refrig Co Ltd | Air conditioner |
| CN102466304A (en) * | 2010-11-16 | 2012-05-23 | 力博特公司 | Air-conditioning system and control method of condensation fan thereof |
| WO2018073904A1 (en) * | 2016-10-19 | 2018-04-26 | 三菱電機株式会社 | Indoor unit of air conditioner and air conditioner |
| CN110131911A (en) * | 2018-02-02 | 2019-08-16 | 艾力集团有限责任公司-卡皮贾尼 | For treatment liquid or the machine and method of semi-liquid food products |
| CN111059709A (en) * | 2019-12-31 | 2020-04-24 | 海信（山东）空调有限公司 | Control method of air conditioner and air conditioner |
| CN215864160U (en) * | 2021-07-01 | 2022-02-18 | 福建佰时德能源科技有限公司 | Air-cooled condensing machine |
-
2021
- 2021-07-01 CN CN202110747700.7A patent/CN113566458A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08121848A (en) * | 1994-10-27 | 1996-05-17 | Matsushita Refrig Co Ltd | Air conditioner |
| CN102466304A (en) * | 2010-11-16 | 2012-05-23 | 力博特公司 | Air-conditioning system and control method of condensation fan thereof |
| WO2018073904A1 (en) * | 2016-10-19 | 2018-04-26 | 三菱電機株式会社 | Indoor unit of air conditioner and air conditioner |
| CN110131911A (en) * | 2018-02-02 | 2019-08-16 | 艾力集团有限责任公司-卡皮贾尼 | For treatment liquid or the machine and method of semi-liquid food products |
| CN111059709A (en) * | 2019-12-31 | 2020-04-24 | 海信（山东）空调有限公司 | Control method of air conditioner and air conditioner |
| CN215864160U (en) * | 2021-07-01 | 2022-02-18 | 福建佰时德能源科技有限公司 | Air-cooled condensing machine |
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