CN115560497B - A low-temperature air source heat pump with improved air supply and enthalpy increase control method and control method thereof - Google Patents
A low-temperature air source heat pump with improved air supply and enthalpy increase control method and control method thereofInfo
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- CN115560497B CN115560497B CN202211298007.7A CN202211298007A CN115560497B CN 115560497 B CN115560497 B CN 115560497B CN 202211298007 A CN202211298007 A CN 202211298007A CN 115560497 B CN115560497 B CN 115560497B
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- expansion valve
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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 discloses a low-temperature air source heat pump for improving a control method of air supplementing and enthalpy increasing and a control method, and relates to the technical field of air conditioner and control method processing. One end fixedly connected with reservoir of check valve subassembly, the one end fixedly connected with gas of water side heat exchanger divides one end fixedly connected with of compressor. On one hand, the situations that the control of the main electronic expansion valve and the auxiliary electronic expansion valve is not coordinated, targets are inconsistent, and control effects are counteracted are effectively solved, on the other hand, the situations that the system state is unstable and the control time is long due to overshoot or overshoot of the main electronic expansion valve and the auxiliary electronic expansion valve are also effectively solved, the system state is fast in convergence, good in stability, and more reliable and stable in operation.
Description
Technical Field
The invention relates to the technical field of air conditioner and control method processing, in particular to a low-temperature air source heat pump for improving an air supplementing and enthalpy increasing control method and a control method.
Background
At present, the low-temperature air source heat pump is widely applied to heating in northern areas, and the air supplementing and enthalpy increasing technology can provide normal heat pump heating in a low-temperature environment of-25 ℃, so that the air supplementing and enthalpy increasing technology is widely applied to a low-temperature air source heat pump unit.
The control method of the in-period air supplementing and enthalpy increasing mainly comprises the steps of controlling the superheat degree of the air supplementing loop and the exhaust temperature of the compressor through an auxiliary electronic expansion valve of the air supplementing loop, or opening the auxiliary electronic expansion valve to perform protection control when the exhaust temperature is too high and the main electronic expansion valve is opened to the maximum. The existing control method has the following defects:
1. The main electronic expansion valve controls the main electronic expansion valve to act according to the exhaust temperature and the exhaust superheat degree, the auxiliary electronic expansion valve controls the auxiliary electronic expansion valve to act through the exhaust temperature, the exhaust superheat degree and the air supplementing loop superheat degree, and if the main electronic expansion valve and the auxiliary electronic expansion valve are not cooperatively controlled, the problems of inconsistent control targets and counteracted control effects exist.
2. The main and auxiliary electronic expansion valves are controlled only according to the deviation of the exhaust temperature, the exhaust superheat degree and the target value, the change trend of the exhaust temperature along with the time is not judged, and the overshoot or overshoot phenomenon exists, so that the system state is unstable and the control time is longer.
Therefore, an improvement is needed to better meet the market demand, and we propose a low-temperature air source heat pump with improved air-supplementing enthalpy-increasing control method and control method for solving the above problems.
Disclosure of Invention
The invention aims to provide a low-temperature air source heat pump and a control method for improving an air supplementing enthalpy increasing control method, which are used for solving the problems that in the background art, a main electronic expansion valve controls the action of the main electronic expansion valve according to the exhaust temperature and the exhaust superheat degree, an auxiliary electronic expansion valve controls the action of the auxiliary electronic expansion valve through the exhaust temperature, the exhaust superheat degree and the air supplementing loop superheat degree, and if the main electronic expansion valve and the auxiliary electronic expansion valve are not cooperatively controlled, the control targets are inconsistent, and the control effect is counteracted.
In order to achieve the aim, the low-temperature air source heat pump for improving the air supplementing and enthalpy increasing control method comprises an air supplementing and enthalpy increasing compressor, wherein one end of the compressor is connected with an exhaust pipe, one end of the exhaust pipe, which is far away from the compressor, is fixedly provided with a four-way valve assembly, and one end of the four-way valve assembly is fixedly connected with an outdoor heat exchanger. One end fixedly connected with reservoir of check valve subassembly, the water side heat exchanger includes shell and tube, sleeve pipe or board and trades, the one end fixedly connected with gas of water side heat exchanger divides one end fixed connection with the compressor. The one-way valve assembly, the liquid accumulator and the auxiliary electronic expansion valve are fixedly connected with the compressor at one end, connected with the silencer, of the outside of the main electronic expansion valve, which is arranged between the one-way valve assembly, the economizer and the auxiliary electronic expansion valve.
By adopting the technical scheme, the situations that the control of the main electronic expansion valve and the auxiliary electronic expansion valve is not coordinated, targets are inconsistent and control effects are offset are effectively solved, and the situations that the system state is unstable and the control time is long due to overshoot or overshoot of the main electronic expansion valve and the auxiliary electronic expansion valve are also effectively solved, so that the system state is fast in convergence, good in stability and more reliable and stable in operation are also effectively solved. Moreover, the invention can cover all low-temperature air source heat pump units with air supplementing and enthalpy increasing functions, and has wide application value.
Preferably, an exhaust temperature probe for detecting the exhaust temperature Td is arranged on the exhaust side of the compressor, an exhaust pressure sensor for detecting the exhaust pressure Pd is arranged on the exhaust side of the compressor, a temperature probe for detecting the air-supplementing inlet temperature tv_in is arranged at the inlet of the economizer air-supplementing loop, and a temperature probe for detecting the air-supplementing outlet temperature tv_out is arranged at the outlet of the economizer air-supplementing loop.
A control method of a low-temperature air source heat pump for improving an air supplementing enthalpy increasing control method comprises the following steps:
S1, starting up and running a unit;
S2, detecting the starting operation time of the compressor, wherein the starting operation time is more than or equal to 5min, and turning to the step S3, otherwise turning to the step S4;
s3, if Td1 is more than 100 ℃, the main electronic expansion valve is opened to the maximum, the auxiliary electronic expansion valve is opened to the maximum, otherwise, the step S5 is carried out;
s4, the main electronic expansion valve and the auxiliary electronic expansion valve keep the initial opening degree, and the step S2 is returned;
s5, if TdSH is higher than 30 ℃, turning to a step S6, otherwise turning to a step S8;
s6, if k is more than 0 ℃, opening the valve 2 (TdSH-25) +3*k of the main electronic expansion valve, otherwise, opening the valve 2 (TdSH-25) of the main electronic expansion valve, and switching to the step S7
S7, if TvSH ℃ is higher than 5 ℃, opening the auxiliary electronic expansion valve by 2 (TdSH-25), otherwise, keeping the opening of the auxiliary electronic expansion valve;
S8, if the temperature is 20 ℃ which is less than TdSH ℃ and less than or equal to 30 ℃, turning to a step S9, otherwise, turning to a step S14;
s9, if the k is more than 2 ℃, the main electronic expansion valve is opened 3*k to go to step S10, otherwise, go to step S11.
S10, if TvSH ℃ is higher than 5 ℃, opening the auxiliary electronic expansion valve 2*k, otherwise, keeping the opening of the auxiliary electronic expansion valve;
S11, if the temperature of k is less than-2 ℃, closing the valve-3*k of the main electronic expansion valve, otherwise, keeping the opening degree of the main electronic expansion valve, and turning to the step S12.
S12, if TvSH is higher than 10 ℃, opening the auxiliary electronic expansion valve TvSH-10, returning to the step S3, otherwise, turning to the step S13;
S13, if TvSH is lower than 3 ℃, closing the auxiliary electronic expansion valve by 4 steps, otherwise, keeping the opening of the auxiliary electronic expansion valve;
s14, if the temperature is 10 ℃ and is less than TdSH ℃ and less than or equal to 20 ℃, turning to a step S15, otherwise, turning to a step S17;
s15, if k is more than 3 ℃, the main electronic expansion valve keeps the opening degree, otherwise, the main electronic expansion valve closes the valve-2 (TdSH-25), and the process goes to step S16.
S16, if TvSH ℃ is higher than 5 ℃, the auxiliary electronic expansion valve keeps the opening degree, otherwise, the auxiliary electronic expansion valve closes valve-2 (TdSH-25), and the step S3 is returned.
S17, closing the main electronic expansion valve-3 (TdSH-25), closing the auxiliary electronic expansion valve-3 (TdSH-25), and returning to the step S3.
Further, the minimum opening degree of the main electronic expansion valve is 70 steps, the maximum opening degree of the main electronic expansion valve is 450 steps, the minimum opening degree of the auxiliary electronic expansion valve is 0 steps, and the maximum opening degree of the auxiliary electronic expansion valve is 450 steps.
The invention has the beneficial effects that:
According to the invention, the main electronic expansion valve, the auxiliary electronic expansion valve and other parts are combined together, so that the design is reasonable, the logic is clear, the control is convenient, on one hand, the situations that the control of the main electronic expansion valve and the auxiliary electronic expansion valve is not coordinated, the targets are inconsistent and the control effect is counteracted are effectively solved, on the other hand, the situations that the system state is unstable and the control time is longer due to overshoot or overshoot of the main electronic expansion valve and the auxiliary electronic expansion valve are also effectively solved, the system state is fast in convergence, the stability is good, and the operation is more reliable and stable. Moreover, the invention can cover all low-temperature air source heat pump units with air supplementing and enthalpy increasing functions, and has wide application value.
Drawings
FIG. 1 is a schematic diagram of the structure and system of the present invention.
Fig. 2 is a control flow chart of the present invention.
The device comprises a compressor 1, a four-way valve assembly, an outdoor heat exchanger 3, a heat exchange fan 4, a one-way valve assembly 5, a main electronic expansion valve 6, an economizer 7, an auxiliary electronic expansion valve 8, a silencer 9, a muffler 10, a liquid reservoir 11, a water side heat exchanger 12 and gas components.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1-2, The invention provides a low-temperature air source heat pump for improving a gas supplementing and enthalpy increasing control method, which comprises a gas supplementing and enthalpy increasing compressor 1, wherein one end of the compressor 1 is connected with an exhaust pipe, one end of the exhaust pipe, which is far away from the compressor 1, is fixedly provided with a four-way valve assembly 2, and one end of the four-way valve assembly 2 is fixedly connected with an outdoor heat exchanger 3. The compressor 1 compresses a low-pressure low-temperature refrigerant into a high-temperature high-pressure superheated gas, and the gas passes through an exhaust pipe to reach the four-way valve assembly 2 and then to reach the outdoor heat exchanger 3 for condensation.
The outdoor heat exchanger 3 is provided with a heat exchange fan 4, and one end of the outdoor heat exchanger 3 is fixedly connected with a one-way valve assembly 5. An economizer 7 and an auxiliary electronic expansion valve 8 are arranged between the one-way valve assembly 5 and the liquid reservoir 10, and a main electronic expansion valve 6 is arranged between the one-way valve assembly 5 and the economizer 7 and the auxiliary electronic expansion valve 8. The refrigerant is condensed by the outdoor heat exchanger, then reaches the economizer 7 through the one-way valve assembly 5, and exchanges heat with the air supplementing loop refrigerant throttled by the auxiliary electronic expansion valve 8, so as to obtain the supercooled high-pressure medium-temperature refrigerant, wherein one end of the one-way valve assembly 5 is fixedly connected with the liquid storage 10, the supercooled high-pressure medium-temperature refrigerant throttled by the main electronic expansion valve 6 and then reaches the liquid storage 10 through the one-way valve assembly 5, in addition, one end of the liquid storage 10 is fixedly connected with the water side heat exchanger 11, and the refrigerant reaches the water side heat exchanger 11 after passing through the liquid storage 10.
The water side heat exchanger 11 comprises a shell tube, a sleeve tube or a plate exchanger, one end of the water side heat exchanger 11 is fixedly connected with an air component 12, and one end of the air component 12 away from the water side heat exchanger 11 is fixedly connected with one end of the compressor 1. The outside of the economizer 7 is connected with a silencer 9, and one end, far away from the economizer 7, of the silencer 9 is fixedly connected with the compressor 1. The water side heat exchanger 11 can be a shell-tube, a sleeve or a plate, and after the refrigerant exchanges heat with water, the obtained low-pressure low-temperature superheated steam returns to the air component 12 through the four-way valve and then returns to the compressor 1 through the air component. The air supplementing loop refrigerant throttled by the auxiliary electronic expansion valve 8 is subjected to heat exchange by the economizer 7 to obtain medium-pressure medium-temperature superheated steam, and the medium-pressure medium-temperature superheated steam is returned to the medium-pressure cavity of the compressor 1 after pulsation and noise are eliminated by the silencer 9.
The exhaust side of the compressor 1 is provided with an exhaust temperature probe for detecting the exhaust temperature Td, the exhaust side of the compressor 1 is provided with an exhaust pressure sensor for detecting the exhaust pressure Pd, the inlet of the air supplementing loop of the economizer 7 is provided with a temperature probe for detecting the air supplementing inlet temperature Tv_in, the outlet of the air supplementing loop of the economizer 7 is provided with a temperature probe for detecting the air supplementing outlet temperature Tv_out, the inside of the compressor 1 is provided with a controller, and the controller calculates the corresponding condensation temperature Tc according to the exhaust pressure.
If the current exhaust temperature, exhaust pressure, and condensing temperature are Td1, pd1, tc1, the exhaust temperature before one valve adjustment cycle is Td0. The controller calculates the exhaust superheat degree TdSH =Td1-Tc1 according to the current exhaust temperature and the condensation temperature, and calculates the air supplementing superheat degree TvSH =Tv_out-Tv_in according to the inlet and outlet temperature of the air supplementing loop of the economizer. Exhaust temperature variation trend k=td1-Td 0, k >0 indicates an exhaust temperature rise, k <0 indicates an exhaust temperature drop, and the larger the absolute value, the stronger the trend.
A control method of a low-temperature air source heat pump for improving an air supplementing enthalpy increasing control method comprises the following steps:
S1, starting up and running a unit;
S2, detecting the starting operation time of the compressor, wherein the starting operation time is more than or equal to 5min, and turning to the step S3, otherwise turning to the step S4;
s3, if Td1 is more than 100 ℃, the main electronic expansion valve is opened to the maximum, the auxiliary electronic expansion valve is opened to the maximum, otherwise, the step S5 is carried out;
s4, the main electronic expansion valve and the auxiliary electronic expansion valve keep the initial opening degree, and the step S2 is returned;
s5, if TdSH is higher than 30 ℃, turning to a step S6, otherwise turning to a step S8;
s6, if k is more than 0 ℃, opening the valve 2 (TdSH-25) +3*k of the main electronic expansion valve, otherwise, opening the valve 2 (TdSH-25) of the main electronic expansion valve, and switching to the step S7
S7, if TvSH ℃ is higher than 5 ℃, opening the auxiliary electronic expansion valve by 2 (TdSH-25), otherwise, keeping the opening of the auxiliary electronic expansion valve;
S8, if the temperature is 20 ℃ which is less than TdSH ℃ and less than or equal to 30 ℃, turning to a step S9, otherwise, turning to a step S14;
s9, if the k is more than 2 ℃, the main electronic expansion valve is opened 3*k to go to step S10, otherwise, go to step S11.
S10, if TvSH ℃ is higher than 5 ℃, opening the auxiliary electronic expansion valve 2*k, otherwise, keeping the opening of the auxiliary electronic expansion valve;
S11, if the temperature of k is less than-2 ℃, closing the valve-3*k of the main electronic expansion valve, otherwise, keeping the opening degree of the main electronic expansion valve, and turning to the step S12.
S12, if TvSH is higher than 10 ℃, opening the auxiliary electronic expansion valve TvSH-10, returning to the step S3, otherwise, turning to the step S13;
S13, if TvSH is lower than 3 ℃, closing the auxiliary electronic expansion valve by 4 steps, otherwise, keeping the opening of the auxiliary electronic expansion valve;
s14, if the temperature is 10 ℃ and is less than TdSH ℃ and less than or equal to 20 ℃, turning to a step S15, otherwise, turning to a step S17;
s15, if k is more than 3 ℃, the main electronic expansion valve keeps the opening degree, otherwise, the main electronic expansion valve closes the valve-2 (TdSH-25), and the process goes to step S16.
S16, if TvSH ℃ is higher than 5 ℃, the auxiliary electronic expansion valve keeps the opening degree, otherwise, the auxiliary electronic expansion valve closes valve-2 (TdSH-25), and the step S3 is returned.
S17, closing the main electronic expansion valve-3 (TdSH-25), closing the auxiliary electronic expansion valve-3 (TdSH-25), and returning to the step S3.
Further, the minimum opening degree of the main electronic expansion valve is 70 steps, the maximum opening degree of the main electronic expansion valve is 450 steps, the minimum opening degree of the auxiliary electronic expansion valve is 0 steps, and the maximum opening degree of the auxiliary electronic expansion valve is 450 steps.
When the air conditioner is used, the compressor 1 compresses low-pressure low-temperature refrigerant into high-temperature high-pressure superheated air, the high-pressure high-temperature high-pressure superheated air reaches the four-way valve assembly 2 through the exhaust pipe and then reaches the outdoor heat exchanger 3 for condensation, the refrigerant is condensed through the outdoor heat exchanger 3 and then reaches the economizer 7 through the one-way valve assembly 5, heat exchange is carried out on the refrigerant and the air supplementing loop refrigerant throttled by the auxiliary electronic expansion valve 8, so that supercooled high-pressure medium-temperature refrigerant is obtained, the supercooled high-pressure medium-temperature refrigerant is throttled by the main electronic expansion valve 6 and then reaches the liquid accumulator 10 through the one-way valve assembly 5, the refrigerant reaches the water side heat exchanger 11 after passing through the liquid accumulator 10, and the low-pressure low-temperature superheated air is obtained after heat exchange of the refrigerant and water returns to the air component 12 through the four-way valve and then returns to the compressor 1 through the air component 12. The air supplementing loop refrigerant throttled by the auxiliary electronic expansion valve 8 is subjected to heat exchange by the economizer 7 to obtain medium-pressure medium-temperature superheated steam, and the medium-pressure medium-temperature superheated steam is returned to the medium-pressure cavity of the compressor 1 after pulsation and noise are eliminated by the silencer 9. The exhaust temperature Td is detected by an exhaust temperature probe on the exhaust side of the compressor 1, the exhaust pressure Pd is detected by an exhaust pressure sensor, the intake temperature tv_in is detected by a temperature probe at the inlet of the air make-up circuit of the air make-up economizer 7, and the outlet temperature tv_out is detected by a temperature probe at the outlet of the air make-up circuit of the air make-up economizer 7. The controller calculates a corresponding condensation temperature Tc from the exhaust pressure. The current exhaust temperature, exhaust pressure, condensing temperature are Td1, pd1, tc1, and exhaust temperature before one valve adjustment period is Td0. The controller calculates the exhaust superheat degree TdSH =Td1-Tc1 according to the current exhaust temperature and the condensation temperature, and calculates the air supplementing superheat degree TvSH =Tv_out-Tv_in according to the inlet and outlet temperature of the air supplementing loop of the economizer. Exhaust temperature variation trend k=td1-Td 0, k >0 indicates an exhaust temperature rise, k <0 indicates an exhaust temperature drop, and the larger the absolute value, the stronger the trend.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The control method of the low-temperature air source heat pump for improving the air supplementing and enthalpy increasing control method comprises an air supplementing and enthalpy increasing compressor (1) and is characterized in that one end of the compressor (1) is connected with an exhaust pipe, one end of the exhaust pipe, which is far away from the compressor (1), is fixedly provided with a four-way valve assembly (2), one end of the four-way valve assembly (2) is fixedly connected with an outdoor heat exchanger (3), the outdoor heat exchanger (3) is provided with a heat exchange fan (4), and one end of the outdoor heat exchanger (3) is fixedly connected with a one-way valve assembly (5);
One end of the one-way valve assembly (5) is fixedly connected with a liquid storage device (10), one end of the liquid storage device (10) is fixedly connected with a water side heat exchanger (11), the water side heat exchanger (11) comprises a shell pipe, a sleeve pipe or a plate exchanger, one end of the water side heat exchanger (11) is fixedly connected with a gas component (12), and one end of the gas component (12) far away from the water side heat exchanger (11) is fixedly connected with one end of the compressor (1);
An economizer (7) and an auxiliary electronic expansion valve (8) are arranged between the one-way valve assembly (5) and the liquid reservoir (10), a main electronic expansion valve (6) is arranged between the one-way valve assembly (5) and the economizer (7) and the auxiliary electronic expansion valve (8), a silencer (9) is connected to the outside of the economizer (7), one end, far away from the economizer (7), of the silencer (9) is fixedly connected with the compressor (1), an exhaust temperature probe for detecting the exhaust temperature Td is arranged on the exhaust side of the compressor (1), an exhaust pressure sensor for detecting the exhaust pressure Pd is arranged on the exhaust side of the compressor (1), a temperature probe for detecting the air supplementing inlet temperature Tv_in is arranged at the inlet of an air supplementing loop of the economizer (7), and a temperature probe for detecting the air supplementing outlet temperature Tv_out is arranged at the outlet of the air supplementing loop of the economizer (7);
The method comprises the following steps:
S1, starting up and running a unit;
S2, detecting the starting operation time of the compressor, wherein the starting operation time is more than or equal to 5min, and turning to the step S3, otherwise turning to the step S4;
s3, if Td1 is more than 100 ℃, the main electronic expansion valve is opened to the maximum, the auxiliary electronic expansion valve is opened to the maximum, otherwise, the step S5 is carried out;
s4, the main electronic expansion valve and the auxiliary electronic expansion valve keep the initial opening degree, and the step S2 is returned;
s5, if TdSH is higher than 30 ℃, turning to a step S6, otherwise turning to a step S8;
s6, if k is more than 0 ℃, opening the valve 2 (TdSH-25) +3*k of the main electronic expansion valve, otherwise, opening the valve 2 (TdSH-25) of the main electronic expansion valve, and switching to the step S7
S7, if TvSH ℃ is higher than 5 ℃, opening the auxiliary electronic expansion valve by 2 (TdSH-25), otherwise, keeping the opening of the auxiliary electronic expansion valve;
S8, if the temperature is 20 ℃ which is less than TdSH ℃ and less than or equal to 30 ℃, turning to a step S9, otherwise, turning to a step S14;
S9, if the k is more than 2 ℃, opening the valve 3*k by the main electronic expansion valve, and turning to the step S10, otherwise turning to the step S11;
s10, if TvSH ℃ is higher than 5 ℃, opening the auxiliary electronic expansion valve 2*k, otherwise, keeping the opening of the auxiliary electronic expansion valve;
s11, if the temperature k is less than-2 ℃, closing the main electronic expansion valve to-3*k, otherwise, keeping the opening of the main electronic expansion valve;
s12, if TvSH is higher than 10 ℃, opening the auxiliary electronic expansion valve TvSH-10, returning to the step S3, otherwise, turning to the step S13;
S13, if TvSH is lower than 3 ℃, closing the auxiliary electronic expansion valve by 4 steps, otherwise, keeping the opening of the auxiliary electronic expansion valve;
s14, if the temperature is 10 ℃ and is less than TdSH ℃ and less than or equal to 20 ℃, turning to a step S15, otherwise, turning to a step S17;
S15, if k is more than 3 ℃, the main electronic expansion valve keeps the opening degree, otherwise, the main electronic expansion valve closes valve-2 (TdSH-25);
s16, if TvSH ℃ is higher than 5 ℃, the auxiliary electronic expansion valve keeps the opening degree, otherwise, the auxiliary electronic expansion valve closes valve-2 (TdSH-25);
S17, closing the main electronic expansion valve-3 (TdSH-25), closing the auxiliary electronic expansion valve-3 (TdSH-25), and returning to the step S3;
Further, the minimum opening degree of the main electronic expansion valve is 70 steps, the maximum opening degree of the main electronic expansion valve is 450 steps, the minimum opening degree of the auxiliary electronic expansion valve is 0 steps, and the maximum opening degree of the auxiliary electronic expansion valve is 450 steps.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211298007.7A CN115560497B (en) | 2022-10-21 | 2022-10-21 | A low-temperature air source heat pump with improved air supply and enthalpy increase control method and control method thereof |
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|---|---|---|---|
| CN202211298007.7A CN115560497B (en) | 2022-10-21 | 2022-10-21 | A low-temperature air source heat pump with improved air supply and enthalpy increase control method and control method thereof |
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| CN115560497A CN115560497A (en) | 2023-01-03 |
| CN115560497B true CN115560497B (en) | 2025-09-23 |
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| CN116085944B (en) * | 2023-01-10 | 2025-09-23 | 上海泰恩特环境技术有限公司 | An intelligent full-frequency rooftop unit with self-diagnosis for incorrect insertion of electronic expansion valve coil and its control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997514A (en) * | 2011-09-09 | 2013-03-27 | 常州晶冷工业制冷设备有限公司 | Water-cooled type low-temperature refrigerant compressor unit with economizer and silencer |
| CN203880998U (en) * | 2012-12-31 | 2014-10-15 | 特灵国际有限公司 | Heat pump system |
| CN114294715A (en) * | 2021-12-29 | 2022-04-08 | 郑州之铂智能科技有限公司 | Multi-split air-supplementing enthalpy-increasing system with economizer and control method thereof |
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| CN105157270A (en) * | 2015-09-24 | 2015-12-16 | 无锡同方人工环境有限公司 | Low-environment-temperature air source heat pump system with undercooling loop |
| CN107655246A (en) * | 2017-09-15 | 2018-02-02 | 广东芬尼能源技术有限公司 | It is a kind of effectively to prevent from being vented too low double electronic expansion-valve control system and method |
| CN114992803B (en) * | 2022-05-30 | 2024-07-09 | 青岛海尔空调电子有限公司 | Control method and device for air replenishment and enthalpy increase of heat pump air conditioner and heat pump air conditioner |
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| CN102997514A (en) * | 2011-09-09 | 2013-03-27 | 常州晶冷工业制冷设备有限公司 | Water-cooled type low-temperature refrigerant compressor unit with economizer and silencer |
| CN203880998U (en) * | 2012-12-31 | 2014-10-15 | 特灵国际有限公司 | Heat pump system |
| CN114294715A (en) * | 2021-12-29 | 2022-04-08 | 郑州之铂智能科技有限公司 | Multi-split air-supplementing enthalpy-increasing system with economizer and control method thereof |
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