CN114198827B - Target exhaust superheat detection method and device, storage medium and air conditioner - Google Patents
Target exhaust superheat detection method and device, storage medium and air conditioner Download PDFInfo
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- CN114198827B CN114198827B CN202111350656.2A CN202111350656A CN114198827B CN 114198827 B CN114198827 B CN 114198827B CN 202111350656 A CN202111350656 A CN 202111350656A CN 114198827 B CN114198827 B CN 114198827B
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- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 239000003507 refrigerant Substances 0.000 claims abstract description 86
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000004364 calculation method Methods 0.000 claims description 28
- 238000012545 processing Methods 0.000 claims description 12
- 238000012937 correction Methods 0.000 claims description 8
- 238000004378 air conditioning Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract description 5
- 230000000704 physical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
Abstract
The invention belongs to the technical field of air conditioners, and particularly provides a target exhaust superheat degree detection method, a target exhaust superheat degree detection device, a storage medium and an air conditioner, aiming at solving the problem of how to obtain the target exhaust superheat degree according to a near isentropic compression principle. To this end, the method of the invention comprises: acquiring suction pressure and discharge pressure of a compressor; acquiring entropy of refrigerant saturated gas at the position of an air suction port of the compressor according to suction pressure; acquiring theoretical optimal exhaust temperature according to entropy and exhaust pressure of refrigerant saturated gas; and obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust pressure. By applying the method of the invention, a more stable detection method of the target exhaust superheat degree which does not depend on the sensor data such as the indoor and outdoor temperature and/or the outlet water temperature can be obtained, more accurate data can be provided for the control of the electronic expansion valve, and the control precision and the anti-interference capability of the air conditioning equipment are further improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a target exhaust superheat degree detection method and device, a storage medium and an air conditioner.
Background
In the operation process of the heat pump air conditioning system, the control of the electronic expansion valve is very critical, and the reliability and the economy of the operation of the whole system are directly affected. Currently, when a heat pump air conditioner is used for heating, an electronic expansion valve is generally controlled according to a target exhaust superheat degree or a target exhaust temperature value, wherein, the electronic expansion valve is controlled according to the target exhaust superheat degree.
At present, a function related to parameters such as an ambient temperature, a water outlet temperature (a hot water system), an internal machine ambient temperature, a system working pressure, a system running frequency and the like is generally adopted for calculating the target exhaust superheat degree, and a great amount of experimental data is often required to be used for obtaining the target exhaust superheat degree function through fitting. When the temperature of the environment in which the heat pump air conditioning system operates is extremely high or extremely low, a large measurement error exists in a temperature sensor of the system, and the result of calculating the target exhaust superheat function according to the parameters is greatly deviated, so that the performance of the heat pump air conditioning system is seriously affected. Therefore, how to obtain a target exhaust superheat calculation method independent of sensor measurement data such as indoor and outdoor environment temperature or water outlet temperature has become a problem to be solved.
Accordingly, there is a need in the art for a new solution to the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problems, namely the problem of how to obtain the target exhaust superheat degree calculation method which does not depend on the measured data of the environmental temperature sensors such as indoor and outdoor environment temperatures or water outlet temperatures.
In a first aspect, the present invention provides a target exhaust superheat detection method, the method comprising:
acquiring suction pressure and discharge pressure of a compressor;
acquiring entropy of refrigerant saturated gas at the position of an air suction port of the compressor according to the suction pressure;
acquiring theoretical optimal exhaust temperature according to the entropy of the refrigerant saturated gas and the exhaust pressure;
and obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust pressure.
In one embodiment of the above target discharge superheat detection method, the step of "obtaining entropy of refrigerant saturated gas at the position of the compressor suction port based on the suction pressure" specifically includes:
obtaining an inhalation absolute pressure according to the inhalation pressure;
according to the suction absolute pressure, obtaining entropy of refrigerant saturated gas at the position of the suction port of the compressor, wherein the calculation method of the entropy of the refrigerant saturated gas comprises the following steps:
S＝a1*Pss 3 +a2*Pss 2 +a3*Pss+a4
wherein S is the entropy of the refrigerant saturated gas, ps is the suction absolute pressure, and a1, a2, a3 and a4 are the triple saturation entropy curve coefficients determined based on the refrigerant in the compressor.
In one embodiment of the above target exhaust superheat detection method, the step of "obtaining a theoretical optimal exhaust temperature according to the entropy of the refrigerant saturated gas and the exhaust pressure" specifically includes:
obtaining the absolute pressure of exhaust according to the exhaust pressure;
according to the entropy of the refrigerant saturated gas and the absolute pressure of the exhaust gas, the theoretical optimal exhaust gas temperature is obtained, and the calculation method of the theoretical optimal exhaust gas temperature is as follows:
Tdcal＝b0+b1*Pdd+b2*S+b3*Pdd 2 +b4*Pdd*S+b5*S 2 +ΔT
wherein Tdcal is the theoretical optimal discharge temperature, pdd is the absolute discharge pressure, S is the entropy of the refrigerant saturated gas, b0, b1, b2, b3, b4 and b5 are the pressure entropy quadric coefficients, which are determined based on the refrigerant in the compressor, and Δt is the discharge temperature correction value.
In one embodiment of the above method for detecting a target exhaust superheat degree, the step of "obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust pressure" specifically includes:
according to the exhaust absolute pressure, obtaining an exhaust saturation temperature corresponding to the exhaust absolute pressure, wherein the exhaust saturation temperature calculating method comprises the following steps:
Pdt＝c1*Pdd 2 +c2*Pdd+c3
wherein Pdt is the exhaust saturation temperature, pdd is the exhaust absolute pressure, c1, c2, c3 are the secondary saturation pressure curve coefficients, which are determined based on the refrigerant in the compressor;
obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust saturation temperature, wherein the calculation method of the target exhaust superheat degree comprises the following steps:
Tdsh＝max(min(Tdcal，Tdismax)-Pdt，25)
wherein Tdsh is a target exhaust superheat degree, tdimax is an exhaust temperature maximum limit value, and Pdt is an exhaust saturation temperature.
In a second aspect, the present invention provides a target exhaust superheat detection device, the device comprising:
the data acquisition module is configured to acquire the suction pressure and the discharge pressure of the compressor;
a data processing module configured to perform the operations of:
acquiring entropy of refrigerant saturated gas at the position of an air suction port of the compressor according to the suction pressure;
acquiring theoretical optimal exhaust temperature according to the entropy of the refrigerant saturated gas and the exhaust pressure;
and obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust pressure.
In one embodiment of the above target exhaust superheat detection device, the data processing module specifically further performs the following operations:
obtaining an inhalation absolute pressure according to the inhalation pressure;
according to the suction absolute pressure, obtaining entropy of refrigerant saturated gas at the position of the suction port of the compressor, wherein the calculation method of the entropy of the refrigerant saturated gas comprises the following steps:
S＝a1*Pss 3 +a2*Pss 2 +a3*Pss+a4
wherein S is the entropy of the refrigerant saturated gas, ps is the suction absolute pressure, and a1, a2, a3 and a4 are the triple saturation entropy curve coefficients determined based on the refrigerant in the compressor.
In one embodiment of the above target exhaust superheat detection device, the data processing module specifically further performs the following operations:
obtaining the absolute pressure of exhaust according to the exhaust pressure;
according to the entropy of the refrigerant saturated gas and the absolute pressure of the exhaust gas, the theoretical optimal exhaust gas temperature is obtained, and the calculation method of the theoretical optimal exhaust gas temperature is as follows:
Tdcal＝b0+b1*Pdd+b2*S+b3*Pdd 2 +b4*Pdd*S+b5*S 2 +ΔT
wherein Tdcal is the theoretical optimal discharge temperature, pdd is the absolute discharge pressure, S is the entropy of the refrigerant saturated gas, b0, b1, b2, b3, b4 and b5 are the pressure entropy quadric coefficients, which are determined based on the refrigerant in the compressor, and Δt is the discharge temperature correction value.
In one embodiment of the above target exhaust superheat detection device, the data processing module specifically further performs the following operations:
according to the exhaust absolute pressure, obtaining an exhaust saturation temperature corresponding to the exhaust absolute pressure, wherein the exhaust saturation temperature calculating method comprises the following steps:
Pdt＝c1*Pdd 2 +c2*Pdd+c3
wherein Pdt is the exhaust saturation temperature, pdd is the exhaust absolute pressure, c1, c2, c3 are the secondary saturation pressure curve coefficients, which are determined based on the refrigerant in the compressor;
obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust saturation temperature, wherein the calculation method of the target exhaust superheat degree comprises the following steps:
Tdsh＝max(min(Tdcal，Tdismax)-Pdt，25)
wherein Tdsh is a target exhaust superheat degree, tdimax is an exhaust temperature maximum limit value, and Pdt is an exhaust saturation temperature.
In a third aspect, the present invention provides a storage medium adapted to store a plurality of program codes adapted to be loaded and executed by a processor to perform the target exhaust superheat detection method of any of the above aspects.
In a fourth aspect, the present invention provides an air conditioner including an air conditioner body, a pressure sensor, a memory, and a processor,
the pressure sensor is used for detecting the suction pressure and the discharge pressure of the compressor of the air conditioner;
the memory is used for storing a plurality of program codes;
the program code is adapted to be loaded and executed by the processor to perform the target exhaust superheat detection method of any of the above aspects.
Under the condition of adopting the technical scheme, the method and the device can accurately detect the target exhaust superheat degree of the air conditioning equipment according to the suction pressure and the exhaust pressure of the compressor and the near isentropic compression principle of the compressor. The method can obtain a more stable detection method of the target exhaust superheat degree which does not depend on the measured data of the sensors such as the indoor and outdoor ambient temperature and/or the outlet water temperature, and the like, provides more accurate control data for the control of the electronic expansion valve, and further improves the control precision and the anti-interference capability of the air conditioning equipment.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of main steps of a target exhaust superheat detection method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the composition structure of a target exhaust superheat detection device according to an embodiment of the present invention.
Fig. 3 is a structural view showing the composition of an air conditioner according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are 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.
It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can adapt it as desired to suit a particular application. For example, although the embodiments of the present invention are described in connection with a heat pump air conditioner, the scope of the present invention is obviously not limited to a heat pump air conditioner, and the method of the present invention is equally applicable to other air conditioning apparatuses having a compressor and capable of acquiring both a suction pressure and a discharge pressure of the compressor.
First, referring to fig. 1, fig. 1 is a flowchart of main steps of a target exhaust superheat detection method according to an embodiment of the present invention. As shown in fig. 1, the target exhaust superheat detection method according to the embodiment of the present invention includes:
step S101: acquiring suction pressure and discharge pressure of a compressor;
step S102: acquiring entropy of refrigerant saturated gas at the position of an air suction port of the compressor according to suction pressure;
step S103: acquiring theoretical optimal exhaust temperature according to entropy and exhaust pressure of refrigerant saturated gas;
step S104: and obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust pressure.
In step S101, the suction pressure is measured by a pressure sensor installed in the compressor inlet line of the heat pump air conditioner, and the discharge pressure is measured by a pressure sensor installed in the compressor outlet line.
In order to ensure the consistency of pressure data in the invention, the pressure data of the sensor are uniformly converted into absolute pressure before data processing, and Mpa is taken as a pressure unit.
In this embodiment, when the gauge pressure data of the suction pressure and the discharge pressure measured by the pressure sensor is the pressure unit, according to the conversion relationship between the pressure unit Bar and the Mpa, the difference relationship between the gauge pressure and the absolute pressure may be obtained, where the suction absolute pressure is:
Pss＝Ps/10+0.1 (1)
in the formula (1), ps is an inhalation absolute pressure, and Ps is an inhalation pressure measured by a pressure sensor:
the absolute pressure of the exhaust gas is:
Pdd＝Pd/10+0.1 (2)
in the formula (2), pdd is the absolute pressure of exhaust gas, and Pd is the pressure of exhaust gas measured by the pressure sensor.
In step S102, assuming that the refrigerant in the air intake of the compressor is saturated gas, the entropy of the saturated gas in the refrigerant at the position of the air intake of the compressor can be obtained from the suction pressure (to be converted into the suction absolute pressure), and the method for calculating the entropy of the saturated gas in the refrigerant is as follows:
S＝a1*Pss 3 +a2*Pss 2 +a3*Pss+a4 (3)
in the formula (3), S is the entropy of the refrigerant saturated gas, ps is the suction absolute pressure, a1, a2, a3, and a4 are the triple saturation entropy curve coefficients, which are a set of constants determined by the refrigerant in the compressor.
When the refrigerant used by the compressor is determined, the method for obtaining the triple saturation entropy curve coefficient according to the refrigerant is not limited by the invention, and the triple saturation entropy curve coefficient can be obtained by performing polynomial fitting according to the saturated pressure of the refrigerant and the gas entropy value corresponding to the saturated pressure, which are provided by a refrigerant manufacturer, as an example. Or the physical property data query of the refrigerant is carried out by internationally authoritative physical property calculation software Nist Refprop, and polynomial fitting is carried out, so as to obtain the triple saturation entropy curve coefficient. The person skilled in the art can choose a suitable technical solution according to the actual situation.
Preferably, in the present embodiment, the refrigerant is R32 refrigerant, and the values of the coefficients of the third-order saturation entropy curves are respectively: a1 -0.1864, a2= 0.5227, a3= -0.6114, a4= 2.4063. Thus, a calculation formula of the entropy of the refrigerant saturated gas when the refrigerant of the heat pump air conditioner compressor shown in the formula (4) is the R32 refrigerant is obtained.
S＝-0.1864*Pss 3 +0.5227*Pss 2 -0.6114*Pss+2.4063 (4)
In step S103, according to the principle of near isentropic compression, the theoretical optimal discharge temperature can be obtained from the entropy S of the refrigerant saturated gas at the air suction port of the compressor and the discharge pressure Pd (to be converted into the discharge absolute pressure Pdd), and the calculation method of the theoretical optimal discharge temperature is as follows:
Tdcal＝b0+b1*Pdd+b2*S+b3*Pdd 2 +b4*Pdd*S+b5*S 2 +ΔT (5)
in the formula (5), tdcal is a theoretical optimum discharge temperature, pdd is a discharge absolute pressure, S is entropy of refrigerant saturated gas, b0, b1, b2, b3, b4, and b5 are pressure entropy quadric coefficients, the pressure entropy quadric coefficients are a set of constants determined by a refrigerant in the compressor, and Δt is a discharge temperature correction value.
When the refrigerant used by the compressor is determined, the method for acquiring the quadric surface coefficient of the pressure entropy according to the refrigerant is not limited. As an example, the method for obtaining the triple saturation entropy curve coefficient may be referred to, and the pressure entropy quadric surface coefficient may be obtained according to a "pressure enthalpy diagram and physical property parameter table" of the refrigerant provided by a refrigerant manufacturer, or by international authoritative physical property calculation software Nist Refprop. The person skilled in the art can choose a suitable technical solution according to the actual situation.
Preferably, in the present embodiment, the refrigerant is R32 refrigerant, and the values of the pressure entropy quadric coefficients are respectively: b0 = 630.157, b1= 37.662, b2= -854.755, b3= -4.027, b4=5.103, b5= 255.5203. Thus, a calculation formula of the theoretical optimal discharge temperature when the refrigerant of the heat pump air conditioner compressor shown in the formula (6) is R32 refrigerant is obtained.
Tdcal＝630.157+37.662*Pdd-854.755*S-4.027*Pdd 2 +5.103*Pdd*S+255.5203*S 2 +ΔT (6)
The exhaust temperature correction value Δt is an empirical value related to the type of air conditioner, the environment of use, etc., and for example, the exhaust temperature correction value Δt of the heat pump air conditioner is usually set to a value ranging from 1 ℃ to 5 ℃, for example, 3 ℃ in the present embodiment.
In step S104, first, an exhaust saturation temperature corresponding to the exhaust absolute pressure is calculated according to the exhaust pressure Pd (to be converted into the exhaust absolute pressure Pdd), and the exhaust saturation temperature is calculated by:
Pdt＝c1*Pdd 2 +c2*Pdd+c3 (7)
in the formula (7), pdt is the exhaust saturation temperature, pdd is the exhaust absolute pressure, c1, c2, and c3 are the secondary saturation pressure curve coefficients, and the secondary saturation pressure curve coefficients are a set of constants determined by the refrigerant in the compressor.
When the refrigerant used by the compressor is determined, the method for acquiring the secondary saturation pressure curve coefficient according to the refrigerant is not limited. As an example, the above-mentioned method for obtaining the triple saturation entropy curve coefficient or the pressure entropy quadric curve coefficient may be referred to, and the secondary saturation pressure curve coefficient may be obtained according to the "pressure enthalpy diagram and physical property parameter table" of the refrigerant provided by the refrigerant manufacturer, or by the internationally authoritative physical property calculation software Nist Refprop. The person skilled in the art can choose a suitable technical solution according to the actual situation.
Preferably, in the present embodiment, the refrigerant is R32 refrigerant, and the values of the secondary saturation pressure curve coefficients are respectively: c1 = -2.0763, c2= 26.849, c3= -13.82. Thus, a calculation formula of the discharge saturation temperature when the refrigerant of the heat pump air conditioner compressor shown in formula (8) is R32 refrigerant is obtained.
Pdt＝-2.0763*Pdd 2 +26.849*Pdd-13.82 (8)
After the exhaust saturation temperature Pdt is obtained, the target exhaust superheat degree can be obtained according to the theoretical optimal exhaust temperature Tdcal and the exhaust saturation temperature Pdt, and the calculation method of the target exhaust superheat degree comprises the following steps:
Tdsh＝max(min(Tdcal，Tdismax)-Pdt，25) (9)
in the formula (9), tdsh is a target exhaust superheat degree, tdimax is an exhaust temperature maximum limit value, tdimax is a maximum tolerance temperature of the compressor itself to the exhaust temperature, and the value range is typically 110 ℃ to 115 ℃, for example, 112 ℃ in this embodiment.
In this embodiment, after the third-order saturation entropy curve coefficient, the pressure entropy quadric curve coefficient, the second-order saturation pressure curve coefficient, the exhaust temperature correction value Δt and Tdismax are determined as the air conditioner operation parameters such as the maximum limit value of the exhaust temperature, the relevant data may be stored in a memory chip inside the heat pump air conditioner, where the memory chip may be an EEPROM chip, a FRAM chip, a FLASH chip, or other types of nonvolatile readable and writable memory chips.
When the refrigerant is determined, the method for acquiring the target exhaust superheat degree is only related to the suction pressure and the exhaust pressure of the compressor, and when the suction pressure is changed severely, the entropy fluctuation of saturated gas is usually small, so that the target exhaust superheat degree has high stability. Moreover, the method is almost suitable for all heat pump air conditioners because the calculation of the target exhaust superheat degree is based on the near isentropic compression principle, and has extremely high universality.
Further, the invention also provides a target exhaust superheat degree detection device. As shown in fig. 2, the target exhaust superheat detection device 2 of the embodiment of the present invention mainly includes: a data acquisition module 21 and a data processing module 22.
The data acquisition module 21 performs step S101 to acquire the suction pressure and the discharge pressure of the heat pump air conditioner compressor by the pressure sensor. In one embodiment, the data acquisition module 21 may also include an intake pressure acquisition sub-module 21a and an exhaust pressure acquisition sub-module 21b.
The suction pressure acquisition sub-module 21a measures the suction pressure by a pressure sensor installed in the air intake pipe of the heat pump air conditioner compressor.
The discharge pressure acquisition sub-module 21b measures the discharge pressure by a pressure sensor installed in the discharge port line of the compressor.
The data processing module 22 executes step S102, step S103 and step S104 to obtain the target exhaust superheat degree according to the suction pressure and the exhaust pressure of the heat pump air conditioner compressor obtained in step S101 according to the near isentropic compression principle. In one embodiment, the data processing module 22 may also include an entropy calculation sub-module 22a, a theoretical optimal exhaust temperature calculation sub-module 22b, and a target exhaust superheat calculation sub-module 22c.
The entropy calculation submodule 22a obtains entropy of the refrigerant saturated gas at the position of the air suction port of the compressor based on the suction pressure.
The theoretical optimal exhaust temperature calculation sub-module 22b obtains the theoretical optimal exhaust temperature according to the entropy of the refrigerant saturated gas and the exhaust pressure.
The target exhaust superheat calculation sub-module 22c obtains the target exhaust superheat according to the theoretical optimum exhaust temperature and exhaust pressure.
Further, the present invention also provides a storage medium, which may be configured to store a program for executing the target exhaust superheat detection method of the above-described method embodiment, where the program may be loaded and executed by a processor to implement the above-described target exhaust superheat detection method. For convenience of explanation, only those portions of the embodiments of the present invention that are relevant to the embodiments of the present invention are shown, and specific technical details are not disclosed, please refer to the method portions of the embodiments of the present invention. The storage medium may be a storage device formed of various electronic devices, and optionally, in an embodiment of the present invention, the storage medium is a non-transitory writable and readable storage medium.
Further, the invention also provides an air conditioner, which is shown in fig. 3 and comprises an air conditioner body 31, a pressure sensor 32, a memory 33 and a processor 34. Preferably, the air conditioner body 31 is a heat pump air conditioner. The pressure sensor 32 is used to acquire the suction pressure and discharge pressure of the air conditioner compressor. The memory 33 and the processor 34 are installed on the air conditioning body 31, and the memory 33 may be configured to store program codes for performing the target exhaust superheat detection method of the above-described method embodiment, which may be loaded and executed by the processor 34 to implement the target exhaust superheat detection method described above. For convenience of explanation, only those portions of the embodiments of the present invention that are relevant to the embodiments of the present invention are shown, and specific technical details are not disclosed, please refer to the method portions of the embodiments of the present invention. The memory 33 may be a storage device formed of various electronic devices, and alternatively, the memory 33 is a non-transitory writable and readable storage medium in an embodiment of the invention.
Those of skill in the art will appreciate that the various illustrative method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of functionality in order to clearly illustrate the interchangeability of electronic hardware and software. Whether such functionality is implemented as electronic hardware or software depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not intended to be limiting.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and the above figures are used for distinguishing between similar objects and not for describing or indicating a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in other sequences than those illustrated or otherwise described herein.
It should be noted that in the description of the present application, the term "a and/or B" indicates all possible combinations of a and B, such as a alone, B alone or a and B.
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 (8)
1. A target exhaust superheat detection method, characterized by comprising:
acquiring suction pressure and discharge pressure of a compressor;
acquiring entropy of refrigerant saturated gas at the position of an air suction port of the compressor according to the suction pressure;
acquiring theoretical optimal exhaust temperature according to the entropy of the refrigerant saturated gas and the exhaust pressure;
acquiring the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust pressure;
the step of obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust pressure specifically includes:
according to the absolute pressure of the exhaust gas, obtaining the exhaust gas saturation temperature corresponding to the absolute pressure of the exhaust gas, wherein the calculation method of the exhaust gas saturation temperature comprises the following steps:
Pdt＝c1*Pdd 2 +c2*Pdd+c3
wherein Pdt is the exhaust saturation temperature, pdd is the exhaust absolute pressure, c1, c2, c3 are the secondary saturation pressure curve coefficients, which are determined based on the refrigerant in the compressor;
obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust saturation temperature, wherein the calculation method of the target exhaust superheat degree comprises the following steps:
Tdsh＝max(min(Tdcal，Tdismax)-Pdt，25)
wherein Tdsh is a target exhaust superheat degree, tdcal is a theoretical optimal exhaust temperature, tdimax is an exhaust temperature maximum limit value, and Pdt is an exhaust saturation temperature.
2. The method of detecting target discharge superheat according to claim 1, wherein the step of obtaining entropy of refrigerant saturated gas at the compressor suction port position based on the suction pressure comprises:
obtaining an inhalation absolute pressure according to the inhalation pressure;
according to the suction absolute pressure, obtaining entropy of refrigerant saturated gas at the position of the suction port of the compressor, wherein the calculation method of the entropy of the refrigerant saturated gas comprises the following steps:
S＝a1*Pss 3 +a2*Pss 2 +a3*Pss+a4
wherein S is the entropy of the refrigerant saturated gas, ps is the suction absolute pressure, and a1, a2, a3 and a4 are the triple saturation entropy curve coefficients determined based on the refrigerant in the compressor.
3. The method according to claim 2, wherein the step of obtaining a theoretical optimum discharge temperature based on the entropy of the refrigerant saturated gas and the discharge pressure comprises:
obtaining the absolute exhaust pressure according to the exhaust pressure;
according to the entropy of the refrigerant saturated gas and the absolute pressure of the exhaust gas, the theoretical optimal exhaust gas temperature is obtained, and the calculation method of the theoretical optimal exhaust gas temperature is as follows:
Tdcal＝b0+b1*Pdd+b2*S+b3*Pdd 2 +b4*Pdd*S+b5*S 2 +ΔT
wherein Tdcal is the theoretical optimal discharge temperature, pdd is the absolute discharge pressure, S is the entropy of the refrigerant saturated gas, b0, b1, b2, b3, b4 and b5 are the pressure entropy quadric coefficients, which are determined based on the refrigerant in the compressor, and Δt is the discharge temperature correction value.
4. A target exhaust superheat detection device, the device comprising:
the data acquisition module is configured to acquire the suction pressure and the discharge pressure of the compressor;
a data processing module configured to perform the operations of:
acquiring entropy of refrigerant saturated gas at the position of an air suction port of the compressor according to the suction pressure;
acquiring theoretical optimal exhaust temperature according to the entropy of the refrigerant saturated gas and the exhaust pressure;
acquiring the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust pressure;
the data processing module specifically further performs the following operations:
according to the absolute pressure of the exhaust gas, obtaining the exhaust gas saturation temperature corresponding to the absolute pressure of the exhaust gas, wherein the calculation method of the exhaust gas saturation temperature comprises the following steps:
Pdt＝c1*Pdd 2 +c2*Pdd+c3
wherein Pdt is the exhaust saturation temperature, pdd is the exhaust absolute pressure, c1, c2, c3 are the secondary saturation pressure curve coefficients, which are determined based on the refrigerant in the compressor;
obtaining the target exhaust superheat degree according to the theoretical optimal exhaust temperature and the exhaust saturation temperature, wherein the calculation method of the target exhaust superheat degree comprises the following steps:
Tdsh＝max(min(Tdcal，Tdismax)-Pdt，25)
wherein Tdsh is a target exhaust superheat degree, tdcal is a theoretical optimal exhaust temperature, tdimax is an exhaust temperature maximum limit value, and Pdt is an exhaust saturation temperature.
5. The target exhaust superheat detection device of claim 4, wherein the data processing module specifically further performs the following operations:
obtaining an inhalation absolute pressure according to the inhalation pressure;
according to the suction absolute pressure, obtaining entropy of refrigerant saturated gas at the position of the suction port of the compressor, wherein the calculation method of the entropy of the refrigerant saturated gas comprises the following steps:
S＝a1*Pss 3 +a2*Pss 2 +a3*Pss+a4
wherein S is the entropy of the refrigerant saturated gas, ps is the suction absolute pressure, and a1, a2, a3 and a4 are the triple saturation entropy curve coefficients determined based on the refrigerant in the compressor.
6. The target exhaust superheat detection device of claim 5, wherein the data processing module specifically further performs the following operations:
obtaining the absolute exhaust pressure according to the exhaust pressure;
according to the entropy of the refrigerant saturated gas and the absolute pressure of the exhaust gas, the theoretical optimal exhaust gas temperature is obtained, and the calculation method of the theoretical optimal exhaust gas temperature is as follows:
Tdcal＝b0+b1*Pdd+b2*S+b3*Pdd 2 +b4*Pdd*S+b5*S 2 +ΔT
wherein Tdcal is the theoretical optimal discharge temperature, pdd is the absolute discharge pressure, S is the entropy of the refrigerant saturated gas, b0, b1, b2, b3, b4 and b5 are the pressure entropy quadric coefficients, which are determined based on the refrigerant in the compressor, and Δt is the discharge temperature correction value.
7. A storage medium adapted to store a plurality of program codes, characterized in that the program codes are adapted to be loaded and executed by a processor to perform the target exhaust superheat detection method of any one of claims 1 to 3.
8. An air conditioner is characterized by comprising an air conditioner body, a pressure sensor, a memory and a processor,
the pressure sensor is used for detecting the suction pressure and the discharge pressure of the compressor of the air conditioner;
the memory is used for storing a plurality of program codes;
the program code, when executed by the processor, implements the target exhaust superheat detection method as claimed in any one of claims 1 to 3.
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