CN112066610A - Defrosting control system of air source heat pump unit - Google Patents
Defrosting control system of air source heat pump unit Download PDFInfo
- Publication number
- CN112066610A CN112066610A CN202011079417.3A CN202011079417A CN112066610A CN 112066610 A CN112066610 A CN 112066610A CN 202011079417 A CN202011079417 A CN 202011079417A CN 112066610 A CN112066610 A CN 112066610A
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- China
- Prior art keywords
- signal acquisition
- acquisition sensor
- fixedly arranged
- heat exchanger
- temperature
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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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
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2103—Temperatures near a heat exchanger
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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 control systems, and particularly relates to a defrosting control system of an air source heat pump unit, which comprises a shell-and-tube heat exchanger, wherein a first electric valve is fixedly arranged at the left end of the shell-and-tube heat exchanger, a second electric valve is fixedly arranged at the upper end of the first electric valve, a first pressure signal acquisition sensor is fixedly arranged at the upper end of the left side of the second electric valve, a check valve is fixedly arranged at the upper end of the right side of the shell-and-tube heat exchanger, a throttling element is fixedly arranged at the upper end of the check valve, a compressor is fixedly arranged at the upper end of the first pressure signal acquisition sensor, and a temperature and humidity signal acquisition sensor is fixedly arranged at the upper end of the second electric valve.
Description
Technical Field
The invention relates to the technical field of control systems, in particular to a defrosting control system of an air source heat pump unit.
Background
Along with the increasing tension of energy and the increasing severity of greenhouse effect, the application of natural energy and clean energy is gradually expanded. The air source is used as one of natural energy sources in the air source heat pump unit, and how to utilize the air source on the air source heat pump unit to the maximum extent is an increasingly urgent need at present. Because the heat transfer material used at present can not avoid the frosting of the heat exchanger under the low temperature condition, the only method is to solve the problem of how to melt the frost after the unit frosts. At present, the defrosting mode of the air source heat pump system is mostly realized by adopting refrigeration cycle through a four-way reversing valve. High-temperature and high-pressure refrigerant gas from the compressor directly enters the frosted surface air cooler through the four-way reversing valve, refrigerant liquid after heat release and temperature reduction completes isenthalpic expansion and throttling pressure reduction after flowing through the electronic expansion valve, enters the hot water heat exchanger to absorb heat and evaporate, and returns to the compressor to complete the defrosting process. Obviously, such a defrosting process is achieved at the expense of the heat of the hot water. In the defrosting process, the unit can not provide heat, but also consumes heat to reduce the water temperature.
The defrosting control conditions are mainly timing defrosting, constant-pressure defrosting and a timing and constant-pressure combined defrosting mode, and the defrosting modes often cause incomplete defrosting or excessive defrosting, so that the unit operation is unstable and the system energy efficiency is reduced.
Disclosure of Invention
The invention aims to provide a defrosting control system of an air source heat pump unit, which aims to solve the problems that the conventional defrosting control system in the background art is easy to cause incomplete defrosting or excessive defrosting, so that the unit is unstable in operation and the energy efficiency of the system is reduced.
In order to achieve the purpose, the invention provides the following technical scheme: a defrosting control system of an air source heat pump unit comprises a shell-and-tube heat exchanger, wherein a first electric valve is fixedly arranged at the left end of the shell-and-tube heat exchanger, a second electric valve is fixedly arranged at the upper end of the first electric valve, a first pressure signal acquisition sensor is fixedly arranged at the upper end of the left side of the second electric valve, a check valve is fixedly arranged at the upper end of the right side of the shell-and-tube heat exchanger, a throttling element is fixedly arranged at the upper end of the check valve, a compressor is fixedly arranged at the upper end of the first pressure signal acquisition sensor, a temperature and humidity signal acquisition sensor is fixedly arranged at the upper end of the second electric valve, a temperature signal acquisition sensor is fixedly arranged at the left end above the temperature and humidity signal acquisition sensor, a fin-type heat exchanger is fixedly arranged at the right end of, and a fan is fixedly arranged at the upper end of the finned heat exchanger.
Preferably, the temperature signal acquisition sensor, the temperature and humidity signal acquisition sensor, the first pressure signal acquisition sensor and the second pressure signal acquisition sensor are all connected with the PLC through the AI processing module.
Preferably, a temperature signal acquisition sensor on an outlet gas collecting pipe of the fin-type heat exchanger detects the temperature in the outlet gas collecting pipe, and a temperature and humidity signal acquisition sensor at an air inlet of the fin-type heat exchanger detects the temperature and the relative humidity of an air dry bulb passing through the fin-type heat exchanger.
Preferably, a first pressure signal acquisition sensor at the exhaust end of the compressor detects the pressure in a pipe at the exhaust end; and a second pressure signal acquisition sensor at the inlet of the fin type heat exchanger detects the pressure of the refrigerant entering the fin type heat exchanger.
Preferably, the fan, the first electric valve and the second electric valve are connected with the PLC through a DO module, and the throttling element is connected with the PLC through a driving control module.
Compared with the prior art, the invention has the beneficial effects that:
through the common cooperation of the compressor, the shell-and-tube heat exchanger, the throttling element, the finned heat exchanger, the fan, the check valve, the second electric valve, the first pressure signal acquisition sensor, the temperature signal acquisition sensor, the second pressure signal acquisition sensor and the temperature and humidity signal acquisition sensor, the defrosting device can defrost frost and defrost frost more thoroughly without reducing the water temperature in the defrosting process as required.
Drawings
FIG. 1 is a schematic flow diagram of a unit system according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of the configuration of a control system according to an embodiment of the present invention.
In the figure: the system comprises a compressor 1, a shell-and-tube heat exchanger 2, a throttling element 3, a finned heat exchanger 4, a fan 5, a check valve 6, a second electric valve 7, a first electric valve 8, a first pressure signal acquisition sensor 9, a temperature signal acquisition sensor 10, a second pressure signal acquisition sensor 11, a temperature and humidity signal acquisition sensor 12, a programmable logic controller 20, an AI processing module 30, a drive control module 31 and a DO module 31.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example (b):
referring to fig. 1-2, the present invention provides a technical solution: a defrosting control system of an air source heat pump unit comprises a shell-and-tube heat exchanger 2, a first electric valve 8 is fixedly arranged at the left end of the shell-and-tube heat exchanger 2, a second electric valve 7 is fixedly arranged at the upper end of the first electric valve 8, a first pressure signal acquisition sensor 9 is fixedly arranged at the upper end of the left side of the second electric valve 7, a check valve 6 is fixedly arranged at the upper end of the right side of the shell-and-tube heat exchanger 2, a throttling element 3 is fixedly arranged at the upper end of the check valve 6, a compressor 1 is fixedly arranged at the upper end of the first pressure signal acquisition sensor 9, a temperature and humidity signal acquisition sensor 12 is fixedly arranged at the upper end of the second electric valve 7, a temperature signal acquisition sensor 10 is fixedly arranged at the left end above the temperature and humidity signal acquisition sensor 12, a fin-type heat exchanger 4 is fixedly, a fan 5 is fixedly arranged at the upper end of the finned heat exchanger 4;
the temperature signal acquisition sensor 10, the temperature and humidity signal acquisition sensor 12, the first pressure signal acquisition sensor 9 and the second pressure signal acquisition sensor 11 are all connected with the PLC 20 through the AI processing module 30;
a temperature signal acquisition sensor 10 on an outlet gas collecting pipe of the fin-type heat exchanger 4 is used for detecting the temperature in the outlet gas collecting pipe, and a temperature and humidity signal acquisition sensor 12 on an air inlet position of the fin-type heat exchanger 4 is used for detecting the temperature and the relative humidity of an air dry bulb passing through the fin-type heat exchanger 4;
a first pressure signal acquisition sensor 9 at the exhaust end of the compressor 1 detects the pressure in a pipe at the exhaust end; a second pressure signal acquisition sensor 11 at the inlet of the fin-type heat exchanger 4 detects the pressure of the refrigerant entering the fin-type heat exchanger 4;
the fan 5, the first electric valve 8 and the second electric valve 7 are connected with the PLC 20 through a DO module 32, and the throttling element 3 is connected with the PLC 20 through a driving control module 31.
The working principle is as follows: when the defrosting device is used, the temperature and humidity signals acquired by the temperature and humidity signal acquisition sensor 12 and the pressure signals acquired by the second pressure signal acquisition sensor 11 are processed by the AI processing module 30 and then are sent to the PLC 20, the acquired signals are further processed, the air source dew point temperature of the finned heat exchanger 4 and the evaporation heat absorption temperature of a refrigerant entering the finned heat exchanger 4 are calculated in real time, the evaporation heat absorption temperature and the dew point temperature are compared, the frosting condition is judged, after the operation working condition meets the frosting condition, the frosting degree is judged through the evaporation temperature, the environment dry-bulb temperature difference and the heat exchange end difference of the finned heat exchanger 4 under different air source working conditions, after the frosting degree reaches the defrosting condition, the air source heat pump unit enters a direct defrosting mode, after the air source heat pump unit enters the defrosting mode, the PLC 20 opens the second electric valve 7 through the DO module 32 and closes the first electric valve 8, The fan 5 is closed, the pressure signal acquired by the first pressure signal acquisition sensor 9 is processed by the AI processing module 30 and then sent to the PLC 20, the acquired signal is further processed by data and then is subjected to PID operation with a preset defrosting pressure set value, the PID operation result is output by the AI processing module 30 to control the opening of the throttling element 3, the refrigerant circulation quantity of the system is adjusted, the temperature signal acquired by the temperature signal acquisition sensor 10 is processed by the AI processing module 30 and then sent to the PLC 20, the acquired signal is further processed by data, the processed data is compared with the preset condition after defrosting is finished, after the defrosting exit condition is met, the fan 5 is temporarily started by the unit to carry out dehumidifying treatment on the finned heat exchanger 4, and in the dehumidifying process, the throttling element 3 maintains the state before dehumidifying unchanged, after defrosting pressure is lower than set pressure in the dehumidification process, the fan 5 is closed to finish the dehumidification process, the unit performs a second dehumidification process after defrosting pressure returns to the set value, the second dehumidification process is finished, the unit quits the defrosting process after defrosting pressure returns to the set value and enters a heating mode, and after the air source heat pump unit enters the heating mode, the PLC 20 opens the first electric valve 8 through the DO module 32 to close the second electric valve 7 and open the fan 5.
While there have been shown and described the fundamental principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A defrosting control system of an air source heat pump unit comprises a shell-and-tube heat exchanger (2) and is characterized in that a first electric valve (8) is fixedly arranged at the left end of the shell-and-tube heat exchanger (2), a second electric valve (7) is fixedly arranged at the upper end of the first electric valve (8), a first pressure signal acquisition sensor (9) is fixedly arranged at the upper end of the left side of the second electric valve (7), a check valve (6) is fixedly arranged at the upper end of the right side of the shell-and-tube heat exchanger (2), a throttling element (3) is fixedly arranged at the upper end of the check valve (6), a compressor (1) is fixedly arranged at the upper end of the first pressure signal acquisition sensor (9), a temperature and humidity signal acquisition sensor (12) is fixedly arranged at the upper end of the second electric valve (7), and a temperature signal acquisition sensor (10) is fixedly arranged, the fan-type air conditioner is characterized in that a fin type heat exchanger (4) is fixedly arranged at the right end of the temperature signal acquisition sensor (10), a second pressure signal acquisition sensor (11) is fixedly arranged at the right end of the fin type heat exchanger (4), and a fan (5) is fixedly arranged at the upper end of the fin type heat exchanger (4).
2. The defrosting control system of the air source heat pump unit according to claim 1, characterized in that: the temperature signal acquisition sensor (10), the temperature and humidity signal acquisition sensor (12), the first pressure signal acquisition sensor (9) and the second pressure signal acquisition sensor (11) are all connected with the PLC (programmable logic controller) through the AI processing module (30).
3. The defrosting control system of the air source heat pump unit according to claim 1, characterized in that: the temperature signal acquisition sensor (10) on the outlet gas collecting pipe of the finned heat exchanger (4) detects the temperature in the outlet gas collecting pipe, and the temperature and humidity signal acquisition sensor (12) at the air inlet of the finned heat exchanger (4) detects the temperature and the relative humidity of air dry balls passing through the finned heat exchanger (4).
4. The defrosting control system of the air source heat pump unit according to claim 1, characterized in that: a first pressure signal acquisition sensor (9) at the exhaust end of the compressor (1) detects the pressure in a pipe at the exhaust end; and a second pressure signal acquisition sensor (11) at the inlet of the fin-type heat exchanger (4) detects the pressure of the refrigerant entering the fin-type heat exchanger (4).
5. The defrosting control system of the air source heat pump unit according to claim 1, characterized in that: the fan (5), the first electric valve (8) and the second electric valve (7) are connected with the PLC (programmable logic controller) (20) through a DO (data only) module (32), and the throttling element (3) is connected with the PLC (programmable logic controller) (20) through a driving control module (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079417.3A CN112066610A (en) | 2020-10-10 | 2020-10-10 | Defrosting control system of air source heat pump unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079417.3A CN112066610A (en) | 2020-10-10 | 2020-10-10 | Defrosting control system of air source heat pump unit |
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| Publication Number | Publication Date |
|---|---|
| CN112066610A true CN112066610A (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011079417.3A Pending CN112066610A (en) | 2020-10-10 | 2020-10-10 | Defrosting control system of air source heat pump unit |
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| CN (1) | CN112066610A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220348054A1 (en) * | 2021-04-28 | 2022-11-03 | Nio Technology (Anhui) Co., Ltd. | Electric vehicle cabin heating system and control method therefor |
-
2020
- 2020-10-10 CN CN202011079417.3A patent/CN112066610A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220348054A1 (en) * | 2021-04-28 | 2022-11-03 | Nio Technology (Anhui) Co., Ltd. | Electric vehicle cabin heating system and control method therefor |
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