CN112923594B - Magnetic suspension evaporation cold direct expansion unit and control method thereof - Google Patents
Magnetic suspension evaporation cold direct expansion unit and control method thereof Download PDFInfo
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- CN112923594B CN112923594B CN202110220059.1A CN202110220059A CN112923594B CN 112923594 B CN112923594 B CN 112923594B CN 202110220059 A CN202110220059 A CN 202110220059A CN 112923594 B CN112923594 B CN 112923594B
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- 238000001704 evaporation Methods 0.000 title claims abstract description 75
- 230000008020 evaporation Effects 0.000 title claims abstract description 73
- 239000000725 suspension Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 196
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 230000005494 condensation Effects 0.000 claims description 42
- 238000009833 condensation Methods 0.000 claims description 42
- 238000005339 levitation Methods 0.000 claims description 14
- 238000012790 confirmation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 14
- 238000001816 cooling Methods 0.000 description 9
- 239000007921 spray Substances 0.000 description 6
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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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
- F25B31/00—Compressor arrangements
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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
- F25B49/022—Compressor control arrangements
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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 belongs to the technical field of refrigeration, and aims to solve the problems that an oil system is mostly adopted in the existing direct expansion unit, and the heat exchange effect is poor, the maintenance is inconvenient, the noise is high, the energy consumption is high and the energy conservation is inconvenient. The invention provides a control method of a magnetic suspension evaporation direct-expansion unit, which comprises a magnetic suspension compressor, an evaporation type condenser, a liquid storage device, a gas-liquid separator and a plurality of indoor air coolers, wherein the evaporation type condenser comprises a condensing fan and a water tank temperature sensor, and the water tank temperature sensor is used for detecting the water temperature in a water tank, and the control method comprises the following steps: acquiring the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit; and controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit. The invention can ensure the heat exchange effect of the unit, is convenient to maintain and low in noise, can realize the dynamic adjustment of the condensing fan, realizes energy-saving control, and is beneficial to reducing the energy consumption of the direct expansion unit.
Description
Technical Field
The invention belongs to the technical field of refrigeration, and particularly provides a magnetic suspension evaporation cold direct expansion unit and a control method thereof.
Background
In the edible fungi cultivation industry, the traditional air conditioner has the defects of high refrigeration power consumption, easy damage to small machine with oil, high maintenance cost, high energy consumption and energy saving because of the adoption of a mode of cold water machine set for producing low-temperature cold water and the mutual heat exchange of the cold water at the indoor tail end or a direct expansion system with one room or two modules of machines, which are all oil systems.
Therefore, a new magnetic suspension evaporation cold direct expansion unit and a control method thereof are needed in the art to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, in order to solve the problems that the existing direct expansion unit mostly adopts an oil system, and has poor heat exchange effect, inconvenient maintenance, high noise and high energy consumption and unfavorable energy saving, the invention provides a control method of a magnetic suspension evaporation direct expansion unit, the magnetic suspension evaporation direct expansion unit comprises a magnetic suspension compressor, an evaporation condenser, a liquid storage device, a gas-liquid separator and a plurality of indoor air coolers, the magnetic suspension compressor, the evaporation condenser, the liquid storage device, the plurality of indoor air coolers and the gas-liquid separator are sequentially connected and jointly form a closed-loop refrigerating system, the evaporation condenser comprises a condensing fan and a water tank temperature sensor, and the water tank temperature sensor is used for detecting the water temperature in a water tank of the evaporation condenser, and the control method comprises the following steps: acquiring the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit; and controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit.
In the preferable technical scheme of the control method, the step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: if the water temperature in the water tank rises to a first temperature threshold value under the condition that the condensing fan is closed, the condensing fan is started; the specific determination mode of the first temperature threshold value is as follows: the method comprises the steps of obtaining the current environment temperature, determining the lowest water temperature of the water tank according to the current environment temperature and the current region and/or season, and determining the first temperature threshold according to the lowest water temperature of the water tank, wherein the first temperature threshold is larger than the lowest water temperature of the water tank.
In the preferable technical scheme of the control method, the step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: if the water temperature in the water tank is reduced to a second temperature threshold value under the condition that the condensing fan is started, the condensing fan is closed; the specific determination mode of the second temperature threshold value is as follows: acquiring the current ambient temperature, determining the lowest water temperature of the water tank according to the current ambient temperature and the current region and/or season, and determining the second temperature threshold according to the lowest water temperature of the water tank, wherein the second temperature threshold is larger than the lowest water temperature of the water tank.
In the preferable technical scheme of the control method, the step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: under the condition that the condensing fan is closed, if the pressure ratio of the magnetic suspension evaporation direct expansion unit is increased to a first set ratio, the condensing fan is started; the specific determination mode of the first set ratio is as follows: acquiring a current environment temperature, determining a condensation saturation temperature according to the current environment temperature and a current region and/or season, determining a corresponding condensation pressure according to the condensation saturation temperature, determining a lowest system pressure ratio according to the condensation pressure and a target evaporation pressure, determining a first set ratio according to the lowest system pressure ratio, and enabling the first set ratio to be larger than the lowest system pressure ratio.
In the preferable technical scheme of the control method, the step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: under the condition that the condensing fan is started, if the pressure ratio of the magnetic suspension evaporation direct expansion unit is reduced to a second set ratio, the condensing fan is closed; the specific determination mode of the second set ratio is as follows: acquiring a current environment temperature, determining a condensation saturation temperature according to the current environment temperature and a current region and/or season, determining a corresponding condensation pressure according to the condensation saturation temperature, determining a lowest system pressure ratio according to the condensation pressure and a target evaporation pressure, determining a second set ratio according to the lowest system pressure ratio, and enabling the second set ratio to be larger than the lowest system pressure ratio.
In the preferable technical scheme of the control method, the step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: under the condition that the condensing fan is closed, if the water temperature in the water tank rises to a first temperature threshold value or the pressure ratio of the magnetic suspension evaporation direct expansion unit rises to a first set ratio, the condensing fan is started; the specific determination mode of the first temperature threshold value is as follows: acquiring a current environment temperature, determining the lowest water temperature of the water tank according to the current environment temperature and the current region and/or season, and determining the first temperature threshold according to the lowest water temperature of the water tank, wherein the first temperature threshold is larger than the lowest water temperature of the water tank; the specific determination mode of the first setting ratio is as follows: acquiring a current environment temperature, determining a condensation saturation temperature according to the current environment temperature and a current region and/or season, determining a corresponding condensation pressure according to the condensation saturation temperature, determining a lowest system pressure ratio according to the condensation pressure and a target evaporation pressure, determining a first set ratio according to the lowest system pressure ratio, and enabling the first set ratio to be larger than the lowest system pressure ratio.
In the preferable technical scheme of the control method, the step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: under the condition that the condensing fan is started, if the water temperature in the water tank is reduced to a second temperature threshold value and the pressure ratio of the magnetic suspension evaporation direct-expansion unit is reduced to a second set ratio, the condensing fan is closed; the specific determination mode of the second temperature threshold value is as follows: acquiring the current ambient temperature, determining the lowest water temperature of the water tank according to the current ambient temperature and the current region and/or season, and determining the second temperature threshold according to the lowest water temperature of the water tank, wherein the second temperature threshold is larger than the lowest water temperature of the water tank; the specific determination mode of the second setting ratio is as follows: acquiring a current environment temperature, determining a condensation saturation temperature according to the current environment temperature and a current region and/or season, determining a corresponding condensation pressure according to the condensation saturation temperature, determining a lowest system pressure ratio according to the condensation pressure and a target evaporation pressure, determining a second set ratio according to the lowest system pressure ratio, and enabling the second set ratio to be larger than the lowest system pressure ratio.
In the preferred technical scheme of the control method, a one-way valve is arranged between the magnetic suspension compressor and the evaporative condenser.
In a preferred embodiment of the above control method, a load balancing valve is provided between the downstream side of the check valve and the gas-liquid separator.
In another aspect, the invention further provides a magnetic levitation evaporation direct expansion unit, which comprises a controller configured to execute the control method.
In the preferred technical scheme of the invention, the direct expansion unit can ensure the heat exchange effect of the unit by adopting the magnetic suspension compressor, namely the oil-free compressor, is convenient to maintain and low in noise, and can realize the start and stop control of the condensing fan by acquiring the water temperature in the water tank of the evaporative condenser and/or the pressure ratio of the magnetic suspension evaporative direct expansion unit, and then controlling the start and stop of the condensing fan according to the water temperature in the water tank of the evaporative condenser and/or the pressure ratio of the magnetic suspension evaporative direct expansion unit, thereby avoiding the continuous start state of the condensing fan as long as the evaporative condenser operates the condensing fan, realizing the dynamic regulation of the condensing fan, realizing the energy-saving control and being beneficial to reducing the energy consumption of the direct expansion unit.
Drawings
FIG. 1 is a schematic diagram of a magnetic levitation evaporation cold direct expansion unit of the present invention;
FIG. 2 is a flow chart of determining the water temperature in the water tank of the on-off condensing fan of the magnetic levitation evaporation direct expansion unit;
FIG. 3 is a flow chart of determining the pressure ratio of a unit for opening and closing a condensing fan of the magnetic suspension evaporation direct expansion unit.
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.
It should be noted that, in the description of the present invention, terms such as "medium," "upper," "lower," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
The invention provides a magnetic suspension evaporation direct expansion unit and a control method thereof, aiming at ensuring the heat exchange effect of the unit, facilitating the maintenance and the low noise, realizing the dynamic adjustment of a condensing fan, realizing the energy-saving control and being beneficial to reducing the energy consumption of the direct expansion unit.
As shown in fig. 1, the magnetic levitation evaporation direct expansion unit of the present invention includes a magnetic levitation compressor 1, an evaporation condenser, a liquid storage device 2, a gas-liquid separator 3 and a plurality of indoor air coolers (in the case of 5 indoor air coolers shown in the figure, of course, practical application is not limited to 5, and can be determined according to the number of rooms and the space size of each room), the magnetic levitation compressor 1, the evaporation condenser, the liquid storage device 2, the plurality of indoor air coolers and the gas-liquid separator 3 are sequentially connected and jointly form a closed-loop refrigerating system, the evaporation condenser includes a water tank 4, a condensing coil, a condensing fan 5, a spray pump 6, a plurality of spray nozzles 7, a water tank temperature sensor 8 and an ambient temperature sensor 9, the spray pump 6 is communicated with the lower portion of the water tank 4 through a pipeline, the spray pump 6 is also communicated with the plurality of spray nozzles 7 near the upper side inside the water tank 4 through a pipeline, the inlet of the condensing coil is communicated with the air outlet of the condensing coil 1 through a pipeline, the outlet of the condensing coil is communicated with the inlet of the liquid storage device 2, the water tank 5 is arranged at the position near the air inlet of the water tank 4, the water tank temperature sensor 8 can be arranged near the lower portion of the water tank 4, and the water tank temperature sensor 9 is arranged near the lower portion of the water tank temperature sensor 4. A check valve 10 is arranged between the condensing coil and the exhaust port of the magnetic suspension compressor 1, the check valve 10 allows refrigerant to flow to the condensing coil only from the exhaust port of the magnetic suspension compressor 1, an evaporative cooling inlet pressure sensor 11 is arranged on the downstream side of the check valve 10 and the upstream side of the condensing coil inlet, and a load balancing valve 12 is connected between the downstream side of the check valve 10 and the gas-liquid separator 3. An exhaust port of the magnetic suspension compressor 1 is provided with an exhaust pressure sensor 13, and an air inlet of the magnetic suspension compressor 1 is provided with an air suction pressure sensor 14. A pipeline communicated with the gas-liquid separator 3 is arranged between the exhaust pressure sensor 13 and the one-way valve 10, and a bypass electromagnetic valve 15 and a bypass expansion valve 16 which are connected in parallel are arranged on the pipeline. The liquid refrigerant led out of the liquid storage device 2 enters two cooling loops, one is a liquid spray cooling loop (on which an electric ball valve 17 is arranged) of the magnetic suspension compressor 1, and the other is a cooling loop which passes through a cooling expansion valve 18 to the gas-liquid separator 3 so as to prevent the gas from being excessively overheated due to gas separation. Each indoor air cooler comprises an indoor fan 19, an indoor heat exchanger 20, an electromagnetic valve 21 and a thermal expansion valve 22 (or an electronic expansion valve), wherein the thermal expansion valve 22 is taken as an example, the electromagnetic valve 21, the thermal expansion valve 22 and the indoor heat exchanger 20 are sequentially arranged along the flowing direction of a refrigerant, and the air outlet end of the indoor fan 19 is arranged towards the indoor heat exchanger 20.
In the invention, a magnetic suspension compressor 1 discharges compressed high-temperature high-pressure gas refrigerant into an evaporative condenser through a one-way valve 10, liquid refrigerant coming out of the evaporative condenser enters a liquid reservoir 2, an economizer or an uneconomical device can be added later, the liquid refrigerant flows through an electric ball valve 17 to enter a room, the liquid refrigerant is split through a split manifold and then is reduced in pressure by an indoor air cooler in different rooms through a thermostatic expansion valve 22 to cool the room, the evaporated gas refrigerant is gathered and enters a gas-liquid separator 3, the overheated low-temperature low-pressure gas refrigerant in the gas-liquid separator 3 enters the magnetic suspension compressor 1, a bypass expansion valve 16 and a bypass electromagnetic valve 15 are used for reducing the pressure ratio in the system, the magnetic suspension compressor 1 is further assisted to start and stop, and a load balance valve 12 is mainly used for energy adjustment and surge control of the magnetic suspension compressor 1. The magnetic suspension compressor 1 takes the set pressure of the touch screen as a target value, controls the evaporation pressure of the indoor air cooler by controlling the suction pressure of the air suction port, and adjusts the energy according to the suction pressure (namely, controls the detected suction pressure to run near the target value), thereby achieving the purpose of cooling the indoor to the required temperature. When the gas refrigerant flows into the evaporative condenser, the gas refrigerant flows into the condensing coil through the inlet of the condensing coil, and the gas refrigerant in the condensing coil exchanges heat with water and air outside the condensing coil, so that the gas refrigerant is changed into a liquid refrigerant.
The control method of the invention comprises the following steps: acquiring the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit; and controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit. In practical application, the start and stop of the condensing fan can be controlled by the water temperature in the water tank alone, the start and stop of the condensing fan can be controlled by the pressure ratio of the unit alone (namely the ratio of the exhaust pressure to the suction pressure of the compressor), and the start and stop of the condensing fan can be controlled together according to the water temperature in the water tank and the pressure ratio of the unit.
When the water temperature in the water tank is used to control the start and stop of the condensing fan, the water tank temperature (marked as a first temperature threshold) when the condensing fan is started and the water tank temperature (marked as a second temperature threshold) when the condensing fan is closed can be determined first, as shown in fig. 2, a specific preferred mode can be as follows: the method comprises the steps of firstly obtaining the current ambient temperature t through an ambient temperature sensor, and approximately calculating the current wet bulb temperature through a formula t1=t-Deltat 1, wherein t1 is the lowest temperature of a evaporating cold water tank, deltat 1 can be checked according to relative humidity in different areas or seasons, then determining the water tank temperature (namely a first temperature threshold) t3=t1+Deltat 3 of a condensing fan, and the water tank temperature (namely a second temperature threshold) t2=t1+Deltat 2 of a condensing fan, wherein Deltat 3 > Deltat2 > 0, and setting the water tank temperature t2 of the condensing fan to be larger than the lowest temperature t1 of an evaporating cold water tank, so that the condensing fan can be turned off, and the problem that the condensing fan is only turned on and off and cannot realize energy-saving control is avoided. In other examples, the first temperature threshold and the second temperature threshold may also be determined from empirical tables.
When the pressure ratio of the unit is used to control the start and stop of the condensing fan, the pressure ratio when the condensing fan is started (marked as a first set ratio) and the pressure ratio when the condensing fan is closed (marked as a second set ratio) can be determined first, as shown in fig. 3, a specific preferred mode can be as follows: the method comprises the steps of firstly obtaining the current ambient temperature t through an ambient temperature sensor, approximately calculating the current wet bulb temperature through a formula t1=t-Deltat 1, checking a table for Deltat 1 according to relative humidity of different areas or seasons, then calculating the evaporative cooling condensation saturated temperature according to a formula t4=t1+ Deltat4, wherein Deltat 4 is the evaporative cooling approaching temperature, and related to the evaporative cooling performance, converting the condensation saturated temperature t4 into a condensation pressure P1 through a pressure enthalpy chart, then determining the lowest system pressure ratio r=P1/P2 according to the condensation pressure P1 and the set target pressure (namely the evaporation pressure P2), wherein P1 and P2 are absolute pressures, finally determining the pressure ratio value (namely the first set ratio) r 2=r+ Deltar2 of a start-up condensation fan, and the pressure ratio value (namely the second set ratio) r 1=r+ Deltar1 > 0 of a shut-down condensation fan. In other examples, the first set ratio and the second set ratio may also be determined from empirical tables.
When the water temperature in the water tank and the pressure ratio of the unit are adopted to jointly control the start and stop of the condensing fan, the water tank temperature when the condensing fan is started and the water tank temperature when the condensing fan is closed, the pressure ratio when the condensing fan is started and the pressure ratio when the condensing fan is closed can be determined according to the mode, and the details are omitted.
The technical solution of the present invention is described below in connection with three preferred embodiments.
Example 1
The step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: under the condition that the condensing fan is closed, if the water temperature in the water tank rises to a first temperature threshold value, the condensing fan is started; and under the condition that the condensing fan is started, if the water temperature in the water tank is reduced to a second temperature threshold value, the condensing fan is turned off, and the first temperature threshold value is larger than the second temperature threshold value. Namely, when the condensing fan is closed and the water temperature in the water tank rises to a first temperature threshold value, the condensing fan is started, if the water temperature in the water tank does not fall to a second temperature threshold value, the condensing fan is always kept in an opened state, and when the water temperature in the water tank falls to the second temperature threshold value, the condensing fan is closed again; when the condensing fan is started and the water temperature in the water tank is reduced to the second temperature threshold value, the condensing fan is closed, if the water temperature in the water tank is not increased to the first temperature threshold value, the condensing fan is kept in a closed state all the time, and when the water temperature in the water tank is increased to the first temperature threshold value, the condensing fan is started again. Through such control mode, can realize the dynamic adjustment of condensing fan through the temperature in the water tank, be favorable to its energy-conserving control.
Example two
The step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: under the condition that the condensing fan is closed, if the pressure ratio of the magnetic suspension evaporation direct expansion unit is increased to a first set ratio, the condensing fan is started; under the condition that the condensing fan is started, if the pressure ratio of the magnetic suspension evaporation direct expansion unit is reduced to a second set ratio, the condensing fan is closed, and the first set ratio is larger than the second set ratio. When the condensing fan is closed and the pressure ratio of the unit is increased to a first set ratio, the condensing fan is started, if the pressure ratio of the unit is not reduced to a second set ratio, the condensing fan is always kept in an opened state, and when the pressure ratio of the unit is reduced to the second set ratio, the condensing fan is closed again; when the condensing fan is started and the pressure ratio of the unit is reduced to a second set ratio, the condensing fan is closed, if the pressure ratio of the unit is not increased to the first set ratio, the condensing fan is always kept in a closed state, and when the pressure ratio of the unit is increased to the first set ratio, the condensing fan is started again. Through the control mode, the dynamic adjustment of the condensing fan can be realized through the pressure ratio of the unit, and the energy-saving control of the condensing fan is facilitated.
Example III
The step of controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit comprises the following steps: under the condition that the condensing fan is closed, if the water temperature in the water tank rises to a first temperature threshold value or the pressure ratio of the magnetic suspension evaporation direct expansion unit rises to a first set ratio, the condensing fan is started; under the condition that the condensing fan is started, if the water temperature in the water tank is reduced to a second temperature threshold value and the pressure ratio of the magnetic suspension evaporation direct expansion unit is reduced to a second set ratio, the condensing fan is closed. That is, when the water temperature in the water tank and the pressure ratio of the unit meet the condition of closing the condensing fan at the same time, the condensing fan is closed, when the water temperature in the water tank and the pressure ratio of the unit meet the condition of opening the condensing fan at the same time, or when one of the water temperature in the water tank and the pressure ratio of the unit meets the condition of opening the condensing fan and the other one meets the condition of closing the condensing fan, the magnetic suspension evaporation direct expansion unit of the invention executes the operation of opening the condensing fan, and the heat exchange effect of the unit is ensured between energy conservation and heat exchange. In addition, the reliability of the unit can be further improved by referring to the water temperature condition in the water tank and the pressure ratio condition of the unit at the same time.
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 (10)
1. The utility model provides a control method of magnetic suspension evaporation cold direct expansion unit, its characterized in that, magnetic suspension evaporation cold direct expansion unit includes magnetic suspension compressor, evaporative condenser, reservoir, gas-liquid separator and a plurality of indoor air-cooler, magnetic suspension compressor, reservoir, a plurality of indoor air-cooler and gas-liquid separator connect gradually and constitute closed-loop refrigerating system jointly, evaporative condenser includes condensing fan and water tank temperature sensor, water tank temperature sensor is used for detecting the temperature of water in the water tank of evaporative condenser, control method includes:
acquiring the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit;
controlling the start and stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic suspension evaporation cold direct expansion unit;
when the water temperature in the water tank is used for controlling the start and stop of the condensing fan, firstly determining the water tank temperature when the condensing fan is started and the water tank temperature when the condensing fan is closed, acquiring the current environment temperature through an environment temperature sensor, calculating the current wet bulb temperature, determining the water tank temperature when the condensing fan is started, closing the water tank temperature of the condensing fan, and setting the water tank temperature when the condensing fan is closed to be higher than the lowest temperature of an evaporative cold water tank so as to ensure that the condensing fan is closed;
when the start-stop of the condensing fan is controlled by adopting the pressure ratio of the magnetic suspension evaporation direct expansion unit, the pressure ratio when the condensing fan is started and the pressure ratio when the condensing fan is closed are firstly determined, the current environment temperature is obtained through an environment temperature sensor, the current wet bulb temperature is calculated, table lookup confirmation is carried out according to the relative humidity in different areas or seasons, the evaporation condensation saturation temperature is calculated, the condensation saturation temperature is converted into the condensation pressure through a pressure enthalpy chart, the lowest system pressure ratio is determined to be absolute pressure according to the condensation pressure and the set target pressure, the pressure ratio when the condensing fan is started is finally determined, and the pressure ratio of the condensing fan is closed.
2. The control method according to claim 1, wherein the step of controlling the start-stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic levitation evaporation direct-expansion unit comprises:
if the water temperature in the water tank rises to a first temperature threshold value under the condition that the condensing fan is closed, the condensing fan is started;
the specific determination mode of the first temperature threshold value is as follows: the method comprises the steps of obtaining the current environment temperature, determining the lowest water temperature of the water tank according to the current environment temperature and the current region and/or season, and determining the first temperature threshold according to the lowest water temperature of the water tank, wherein the first temperature threshold is larger than the lowest water temperature of the water tank.
3. The control method according to claim 1, wherein the step of controlling the start-stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic levitation evaporation direct-expansion unit comprises:
if the water temperature in the water tank is reduced to a second temperature threshold value under the condition that the condensing fan is started, the condensing fan is closed;
the specific determination mode of the second temperature threshold value is as follows: acquiring the current ambient temperature, determining the lowest water temperature of the water tank according to the current ambient temperature and the current region and/or season, and determining the second temperature threshold according to the lowest water temperature of the water tank, wherein the second temperature threshold is larger than the lowest water temperature of the water tank.
4. The control method according to claim 1, wherein the step of controlling the start-stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic levitation evaporation direct-expansion unit comprises:
under the condition that the condensing fan is closed, if the pressure ratio of the magnetic suspension evaporation direct expansion unit is increased to a first set ratio, the condensing fan is started;
the specific determination mode of the first set ratio is as follows: acquiring a current environment temperature, determining a condensation saturation temperature according to the current environment temperature and a current region and/or season, determining a corresponding condensation pressure according to the condensation saturation temperature, determining a lowest system pressure ratio according to the condensation pressure and a target evaporation pressure, determining a first set ratio according to the lowest system pressure ratio, and enabling the first set ratio to be larger than the lowest system pressure ratio.
5. The control method according to claim 1, wherein the step of controlling the start-stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic levitation evaporation direct-expansion unit comprises:
under the condition that the condensing fan is started, if the pressure ratio of the magnetic suspension evaporation direct expansion unit is reduced to a second set ratio, the condensing fan is closed;
the specific determination mode of the second set ratio is as follows: acquiring a current environment temperature, determining a condensation saturation temperature according to the current environment temperature and a current region and/or season, determining a corresponding condensation pressure according to the condensation saturation temperature, determining a lowest system pressure ratio according to the condensation pressure and a target evaporation pressure, determining a second set ratio according to the lowest system pressure ratio, and enabling the second set ratio to be larger than the lowest system pressure ratio.
6. The control method according to claim 1, wherein the step of controlling the start-stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic levitation evaporation direct-expansion unit comprises:
under the condition that the condensing fan is closed, if the water temperature in the water tank rises to a first temperature threshold value or the pressure ratio of the magnetic suspension evaporation direct expansion unit rises to a first set ratio, the condensing fan is started;
the specific determination mode of the first temperature threshold value is as follows: acquiring a current environment temperature, determining the lowest water temperature of the water tank according to the current environment temperature and the current region and/or season, and determining the first temperature threshold according to the lowest water temperature of the water tank, wherein the first temperature threshold is larger than the lowest water temperature of the water tank;
the specific determination mode of the first setting ratio is as follows: acquiring a current environment temperature, determining a condensation saturation temperature according to the current environment temperature and a current region and/or season, determining a corresponding condensation pressure according to the condensation saturation temperature, determining a lowest system pressure ratio according to the condensation pressure and a target evaporation pressure, determining a first set ratio according to the lowest system pressure ratio, and enabling the first set ratio to be larger than the lowest system pressure ratio.
7. The control method according to claim 1, wherein the step of controlling the start-stop of the condensing fan according to the water temperature in the water tank and/or the pressure ratio of the magnetic levitation evaporation direct-expansion unit comprises:
under the condition that the condensing fan is started, if the water temperature in the water tank is reduced to a second temperature threshold value and the pressure ratio of the magnetic suspension evaporation direct-expansion unit is reduced to a second set ratio, the condensing fan is closed;
the specific determination mode of the second temperature threshold value is as follows: acquiring the current ambient temperature, determining the lowest water temperature of the water tank according to the current ambient temperature and the current region and/or season, and determining the second temperature threshold according to the lowest water temperature of the water tank, wherein the second temperature threshold is larger than the lowest water temperature of the water tank;
the specific determination mode of the second setting ratio is as follows: acquiring a current environment temperature, determining a condensation saturation temperature according to the current environment temperature and a current region and/or season, determining a corresponding condensation pressure according to the condensation saturation temperature, determining a lowest system pressure ratio according to the condensation pressure and a target evaporation pressure, determining a second set ratio according to the lowest system pressure ratio, and enabling the second set ratio to be larger than the lowest system pressure ratio.
8. The control method according to claim 1, wherein a check valve is provided between the magnetic levitation compressor and the evaporative condenser.
9. The control method according to claim 8, characterized in that a load balancing valve is provided between the downstream side of the check valve and the gas-liquid separator.
10. A magnetic levitation evaporation direct expansion unit, characterized in that it comprises a controller configured to be able to perform the control method according to any of claims 1 to 9.
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| CN104807139A (en) * | 2015-04-24 | 2015-07-29 | 广东美的制冷设备有限公司 | Control method of air conditioner and control device |
| CN109631377A (en) * | 2018-11-21 | 2019-04-16 | 青岛海尔空调电子有限公司 | Evaporation cooling type cold water set heat exchange system and its control method |
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| CN210663099U (en) * | 2019-09-23 | 2020-06-02 | 中国联合网络通信集团有限公司 | Air conditioning system |
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| US20180031292A1 (en) * | 2016-07-26 | 2018-02-01 | Mingsheng Liu | Condenser Pressure Control System and Method |
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| CN104807139A (en) * | 2015-04-24 | 2015-07-29 | 广东美的制冷设备有限公司 | Control method of air conditioner and control device |
| CN109631377A (en) * | 2018-11-21 | 2019-04-16 | 青岛海尔空调电子有限公司 | Evaporation cooling type cold water set heat exchange system and its control method |
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