CN110594982B - Air conditioner return air temperature detection, correction and control method - Google Patents
Air conditioner return air temperature detection, correction and control method Download PDFInfo
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- CN110594982B CN110594982B CN201910889127.6A CN201910889127A CN110594982B CN 110594982 B CN110594982 B CN 110594982B CN 201910889127 A CN201910889127 A CN 201910889127A CN 110594982 B CN110594982 B CN 110594982B
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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
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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
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Abstract
The invention discloses a method for detecting, correcting and controlling return air temperature of an air conditioner, which is used for heating operation of the air conditioner and shutdown or reaching temperature of partial indoor unitsThe detection and correction of the return air temperature during shutdown, and the correction control method comprises the following steps: before the whole machine is started, the return air temperature detection value T of each internal machine is recorded1(ii) a After a part of internal machines are started, the return air temperature detection value T of the internal machines is detected by the return air temperature of the internal machines which are shut down1Determining the return air temperature correction value T of the shutdown internal machine together with the temperature correction deviation value1 correction(ii) a Or after the internal machine which is started up is stopped at the temperature, the return air temperature value T is changed from the temperature when the internal machine is stopped at the temperature2Determining the return air temperature correction value T of the warm shutdown internal machine according to the temperature correction deviation value2 correctionThrough revising return air temperature, it is big to have avoided leading to return air temperature to detect the deviation because the heat gathers, has promoted the detection precision, avoids the fan frequently to start the comfortable experience nature that influences the user.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a detection, correction and control method for return air temperature of an air conditioner.
Background
When the multi-connected air conditioning unit is used for heating, the conditions that one part of the internal machines are operated and one part of the internal machines are shut down or shut down when the temperature is reached frequently exist.
Because the expansion valve of the shutdown internal machine or the shutdown internal machine at the temperature needs to keep a certain opening degree during heating, the operation requirement of the refrigerant of the whole system can be conveniently adjusted. Therefore, the refrigerant can also dissipate heat to the outside when circulating in the shutdown/to-temperature shutdown internal machine. At the moment, the fans of the indoor units are all in a stop state, so that the dissipated heat can be gathered inside the units, and the detection value of the return air sensor of the indoor unit is higher and distorted.
The detection value of the return air sensor is distorted when the heat is accumulated, and when the detection value is higher than the set value, the detection value is misjudged to be high in environmental temperature and does not need to be started, so that the return air sensor is not started. In order to solve the problem, the fan is usually started at regular time to circulate air, so that heat accumulation is avoided. However, this method requires periodic and frequent starting of the blower, and is poor in comfort and experience for users.
Disclosure of Invention
The invention aims to provide a method for detecting, correcting and controlling air-conditioning return air temperature, which aims to solve the technical problem that when an air conditioner is in heating operation and part of internal machines are shut down or shut down when reaching a temperature, the normal control on the start-up of a unit is influenced due to inaccurate return air temperature detection caused by heat accumulation in the internal machines.
In order to achieve the purpose, the invention adopts the following technical scheme,
a detection and correction control method for air conditioner return air temperature is used for detection and correction of return air temperature when an air conditioner is in heating operation and part of internal machines are shut down or shut down to a temperature, and comprises the following steps:
s1, before the whole machine is started, the return air temperature detection value T of each internal machine is recorded1；
S2, after partial internal machines are started, calculating the temperature correction deviation value of the shutdown internal machine according to the running time of the complete machine and the heat leakage quantity of the shutdown internal machine, and calculating the temperature correction deviation value of the shutdown internal machine according to the return air temperature detection value T of the shutdown internal machine1Determining the return air temperature correction value T of the shutdown internal machine together with the temperature correction deviation value1 correction(ii) a And/or the presence of a gas in the gas,
s2', after the internal machine is started and is stopped at a temperature, the return air temperature value T when the machine is stopped at the temperature is recorded2Calculating the temperature correction deviation value of the internal machine of the warm shutdown according to the time after the internal machine of the warm shutdown from the startup to the warm shutdown and the temperature rise rate of the internal machine of the warm shutdown from the startup to the warm shutdown and the heat leakage quantity of the internal machine of the warm shutdown, and calculating the return air temperature value T when the internal machine of the warm shutdown is reached2Determining the return air temperature correction value T of the warm shutdown internal machine together with the temperature correction deviation value2 correction。
Further, step S2 specifically includes:
s21, after partial internal machines are started, the internal machines are shut down every interval delta T according to the temperature T in the running pipe of the whole machinemCalculating the heat leakage quantity Q of the shutdown internal machine;
s22, calculating a temperature correction deviation value delta T of the shutdown internal machine according to the heat leakage quantity Q of the shutdown internal machine at each interval delta T;
s23. every interval delta tThe return air temperature of the internal machine is corrected, and the machine set corrects the value T according to the return air temperature of the internal machine1 correctionAnd (6) performing operation judgment.
Further, in step S21, the calculation formula of the heat leakage Q of the internal machine during the time interval Δ t is as follows,
Q＝C1*[(Tm/100)4-(T1/100)4]*A
wherein, C1And A is the surface area of the heat exchanger of the shutdown internal machine.
Further, in step S22, the temperature correction deviation Δ T of the internal machine during the time interval Δ T is calculated as,
ΔT＝B*Q/(C2*(3*Q1/200)*ρ)
wherein B is a correction coefficient, C2Is an air state constant, Q1ρ is the air density for the rated capacity of the internal machine when the machine is turned off.
Further, in step S23, the return air temperature correction value T for the off-internal unit1 correctionThe formula for calculating (a) is as follows,
T1 correction＝T1 last correction+ΔT
Wherein, T1 last correctionThe return air temperature correction value of the shutdown internal machine obtained after the last delta t time correction;
when the unit is judged to operate, if the condition 1 is met: t is1 correction≤T1 is provided with+ΔT1setIf the condition 1 is not met, the starting is not needed;
wherein, T1 is provided withSetting the starting temperature, Δ T, for the internal machine to be shut down1setAnd setting a temperature allowable fluctuation error value for the shutdown internal machine.
Further, step S2' specifically includes:
s21', recording the return air temperature value T when the engine is stopped at a warm state2And the total time t' from start-up to warm-stop; after the machine is stopped at the temperature, the temperature reduction temperature difference value delta T after the machine is stopped at the temperature is calculated according to the temperature rise speed before the machine is stopped at the temperature at intervals delta T1′；
S22'. when the machine is shut down at a temperature, the time of each interval delta T of the machine when the machine is shut down at the temperature is according to the temperature T in the running pipe of the whole machinem' calculating the heat leakage quantity Q ' of the warm shutdown internal machine, and calculating the temperature rise difference value delta T of the warm shutdown internal machine according to the heat leakage quantity Q ' of the warm shutdown internal machine2′；
S23', correcting the return air temperature of the warm shutdown internal machine every delta T time, and enabling the machine set to be in accordance with the return air temperature correction value T of the warm shutdown internal machine2 correctionAnd (6) performing operation judgment.
Further, in step S21 ', the temperature drop temperature difference value Δ T1' from the time interval Δ T to the warm-up shutdown internal machine is calculated as,
ΔT1′＝(T2-T1)/t′*Δt。
further, in step S22 ', the amount of heat leakage Q' per time interval Δ t to the warm-stop internal machine is calculated by the formula,
Q′＝C1*[(Tm′/100)4-(T2/100)4]*A
wherein, C1A is a heat exchange constant, and A is the surface area of a heat exchanger of the machine in the machine halt at the temperature;
the temperature rise temperature difference value delta T of the internal machine is stopped when the temperature reaches the temperature every delta T time2The formula for the calculation of' is that,
ΔT2′＝B*Q′/(C2*(3*Q1′/200)*ρ)
wherein B is a correction coefficient, C2Is an air state constant, Q1' is the rated capacity of the internal machine at the shutdown to temperature, and ρ is the air density.
Further, in step S23', the corrected value T of the return air temperature to the warm-stop internal machine2 correctionThe formula for calculating (a) is as follows,
T2 correction＝T2 last correction-ΔT1′+ΔT2′，
Wherein, T2 last correctionThe return air temperature correction value of the internal machine which is shut down to the temperature is obtained after the last delta t time correction;
when the unit is judged to operate, if the condition 2 is met: t is2 correction≤T2 is provided with+ΔT2setIf the condition 2 is not met, continuing to warm shutdown;
wherein, T2 is provided withTo reach the set temperature of the warm-up shutdown internal machine, Δ T2setAnd setting a temperature allowable fluctuation error value for the internal machine of the temperature shutdown machine.
Further, if the operation of the external unit is changed into a shutdown state in the process of the shutdown of the internal unit when the temperature is reached, the air conditioner return air temperature correction control is quitted, and the unit is judged to operate according to the actually detected return air temperature of the shutdown internal unit when the temperature is reached.
The invention has the following beneficial effects:
the invention relates to a method for detecting, correcting and controlling the return air temperature of an air conditioner, which is characterized in that when the air conditioner is in heating operation, after a part of internal machines are started, the return air temperature detection value of the internal machine which is shut down and the temperature correction deviation value of the internal machine which is shut down determine the return air temperature correction value T of the internal machine which is shut down according to the return air temperature1 correction(ii) a Or after the internal machine which is started up is stopped at the temperature, the return air temperature value T is changed from the temperature when the internal machine is stopped at the temperature2Determining the return air temperature correction value T of the warm shutdown internal machine from the temperature correction deviation value of the warm shutdown internal machine2 correctionThe air return temperature of the shutdown inner machine or the temperature-reached shutdown inner machine is corrected, so that the problem that the air return temperature detection deviation is large due to heat collection is avoided, the detection precision is improved, and the influence on the comfort experience of a user due to frequent starting of the fan is avoided.
Drawings
FIG. 1 is a flow chart of the operation state of each internal unit during the heating operation of the air conditioner;
FIG. 2 is a flow chart of return air temperature detection and correction when part of the internal machine is turned off;
FIG. 3 is a flow chart of the return air temperature detection and correction when the internal unit of the invention is shut down to a warm state.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
Fig. 1 is a flow chart of the operation state of each internal unit when the air conditioner is in heating operation.
As shown in fig. 1, when the multi-connected air conditioning unit of the present invention is operated for heating, there are situations that a part of the indoor units are turned on and a part of the indoor units are turned off. The starting-up internal machines stop at the temperature after reaching the set temperature, and the external machines keep running if other internal machines still run after part of the internal machines stop at the temperature; and if all the internal machines are shut down or shut down when reaching the temperature, the external machine is shut down.
When some internal machines are started, refrigerants circulate in the shutdown internal machines or the temperature-reaching shutdown internal machines to form heat leakage, meanwhile, because fans of the shutdown internal machines or the temperature-reaching shutdown internal machines are not started, heat is gathered in the internal machines, the detection value of the return air temperature sensor of the unit is high and distorted, if the actual ambient temperature is 18 ℃, the detection value of the return air temperature can reach more than 25 ℃, if the user sets 20 ℃ for starting, the unit can misjudge that the current temperature reaches the user requirement, and the unit does not need to be started, so that the unit cannot be normally started. In order to avoid the influence of heat accumulation on the normal control starting of the unit during heating operation, the return air temperature of the shutdown internal unit or the temperature-reaching shutdown internal unit needs to be corrected and controlled.
Example 1:
fig. 2 is a flow chart of the return air temperature detection and correction when part of the internal unit is turned off.
As shown in fig. 2, the present embodiment provides a method for detecting, correcting and controlling return air temperature of an air conditioner, which is used for detecting and correcting return air temperature during heating operation of the air conditioner and when part of an internal machine is turned off, and the method for correcting and controlling the return air temperature of the air conditioner includes:
s1, before the whole machine is started, the return air temperature detection value T of each internal machine is recorded1；
S2, after partial internal machines are started, calculating the temperature correction deviation value of the shutdown internal machine according to the running time of the complete machine and the heat leakage quantity of the shutdown internal machine, and calculating the temperature correction deviation value of the shutdown internal machine according to the return air temperature detection value T of the shutdown internal machine1Determining the return air temperature correction value T of the shutdown internal machine together with the temperature correction deviation value1 correction。
The invention relates to a method for detecting, correcting and controlling the return air temperature of an air conditioner, which is characterized in that when the air conditioner is in heating operation, after a part of internal machines are started, the return air temperature detection value T of the internal machines which are shut down is used for detecting and correcting the return air temperature of the air conditioner1With the temperature of the internal machine being turned offDetermining the return air temperature correction value T of the shutdown internal machine by the corrected deviation value1 correctionThe unit is corrected according to the return air temperature of the internal machine1 correctionThe operation judgment is carried out, the condition that the return air temperature detection deviation of the shutdown internal machine is large due to heat collection is avoided, the detection precision is improved, fine control is realized, and the user comfort is improved.
As shown in fig. 2, in this embodiment, step S2 specifically includes:
s21, after partial internal machines are started, the internal machines are shut down every interval delta T according to the temperature T in the running pipe of the whole machinemCalculating the heat leakage quantity Q of the shutdown internal machine;
s22, calculating a temperature correction deviation value delta T of the shutdown internal machine according to the heat leakage quantity Q of the shutdown internal machine at each interval delta T;
s23, correcting the return air temperature of the shutdown internal machine every delta T time, and correcting the unit according to the return air temperature correction value T of the shutdown internal machine1 correctionAnd (6) performing operation judgment.
In particular, the temperature T in the running pipe of the complete machinemThe tube temperature in the middle of the inner evaporator is indicated.
In step S21 of the present embodiment, the calculation formula of the heat leakage Q of the internal machine during the time interval Δ t is as follows,
Q＝C1*[(Tm/100)4-(T1/100)4]*A
wherein, C1And (3) determining a heat exchange constant according to experiment determination, wherein A is the surface area of the heat exchanger of the shutdown internal machine and is determined according to the specific structure of the shutdown internal machine.
In step S22, the calculation formula of the temperature correction deviation Δ T of the shutdown internal machine at each time interval Δ T is,
ΔT＝B*Q/(C2*(3*Q1/200)*ρ)
wherein B is a correction coefficient determined according to the installation form of the internal machine, and C2Is an air state constant, Q1ρ is the air density for the rated capacity of the internal machine when the machine is turned off.
In step S23, the return air temperature correction value T for the off-internal unit1 correctionThe formula for calculating (a) is as follows,
T1 correction＝T1 last correction+ΔT
Wherein, T1 last correctionAnd the corrected value of the return air temperature of the shutdown internal machine is obtained after the last delta t time correction.
Specifically, if the total unit operation time T is equal to Δ T, the return air temperature correction value T of the internal unit is turned off1 correction＝T1+ Δ T; if the running time T of the whole machine meets the condition that T is not more than n delta T and T is less than (n +1) delta T, the return air temperature correction value T of the shutdown internal machine1 correction＝T1 last correction+ Δ T, where T1 last correctionAnd delta T is a return air temperature correction value obtained after the nth-1 time of correction, and is a temperature correction deviation value of the internal machine which is turned off at the nth time. Can be further deduced from1 correction＝T1And c, sigma delta T, wherein the sigma delta T is the sum of the deviation values of the temperature correction of the internal machine from 0 to n times when the internal machine is shut down.
The air-conditioning return air temperature detection correction control method of the invention integrates the running time of the whole machine and the heat leakage quantity of the shutdown internal machine to calculate the temperature correction deviation value of the shutdown internal machine, and the return air temperature detection value T of the shutdown internal machine is used1Determining the return air temperature correction value T of the shutdown internal machine together with the temperature correction deviation value1 correction。
In this embodiment, the unit is corrected according to the return air temperature of the internal unit1 correctionWhen the operation judgment is carried out, if the condition 1 is met: t is1 correction≤T1 is provided with+ΔT1setIf so, the starting condition is met; if the condition 1 is not met, starting up is not needed;
wherein, T1 is provided withSetting the starting temperature, Δ T, for the internal machine to be shut down1setAnd setting a temperature allowable fluctuation error value for the shutdown internal machine.
The invention corrects the return air temperature of the shutdown internal machine to enable the return air temperature of the shutdown internal machine to be corrected to be the corrected value T1 correctionThe temperature is closer to the actual temperature of the environment, so that the unit is prevented from being influenced by heat collection during heating operation, and the start-up can be normally controlled.
Example 2:
fig. 3 is a flow chart of return air temperature detection and correction when part of the internal unit is shut down to a warm state.
As shown in fig. 3, the present embodiment provides a detection and correction control method for air-conditioning return air temperature, which is used for detection and correction of return air temperature during heating operation of an air conditioner and when part of internal machines are stopped to warm, and the correction control method includes:
s1, before the whole machine is started, the return air temperature detection value T of each internal machine is recorded1；
S2', after the internal machine is started and is stopped at a temperature, the return air temperature value T when the machine is stopped at the temperature is recorded2Calculating the temperature correction deviation value of the internal machine of the warm shutdown according to the time after the internal machine of the warm shutdown from the startup to the warm shutdown and the temperature rise rate of the internal machine of the warm shutdown from the startup to the warm shutdown and the heat leakage quantity of the internal machine of the warm shutdown, and calculating the return air temperature value T when the internal machine of the warm shutdown is reached2Determining the return air temperature correction value T of the warm shutdown internal machine together with the temperature correction deviation value2 correction。
In particular, the return air temperature value T at the time of warm shutdown2＝T2 is provided with+ΔT2set，
Wherein, T2 is provided withTo reach the set temperature of the warm-up shutdown internal machine, Δ T2setAnd setting a temperature allowable fluctuation error value for the internal machine of the temperature shutdown machine.
The invention relates to a method for detecting, correcting and controlling the return air temperature of an air conditioner, which is characterized in that when the air conditioner is in heating operation, part of internal machines stop working when reaching the temperature and the internal machines still run, the return air temperature value T is obtained when the machines stop working when reaching the temperature2Determining the return air temperature correction value T of the warm shutdown internal machine from the temperature correction deviation value of the warm shutdown internal machine2 correctionThe unit stops the internal machine according to the return air temperature correction value T2 correctionCarry out the operation and judge, it is big to have avoided because the heat gathers and lead to the return air temperature detection deviation of warm shutdown internal unit, has promoted the detection precision, realizes the control that becomes more meticulous, promotes user's travelling comfort.
In this embodiment, step S2' specifically includes:
s21', recording the return air temperature value T when the engine is stopped at a warm state2And the total time t' from start-up to warm-stop; after the machine is stopped at the temperature, the temperature reduction temperature difference value delta T after the machine is stopped at the temperature is calculated according to the temperature rise speed before the machine is stopped at the temperature at intervals delta T1′；
S22'. TheAfter warm shutdown, the time of each interval delta T of the internal machine of the warm shutdown is determined according to the temperature T in the running pipe of the whole machinem' calculating the heat leakage quantity Q ' of the warm shutdown internal machine, and calculating the temperature rise difference value delta T of the warm shutdown internal machine according to the heat leakage quantity Q ' of the warm shutdown internal machine2′；
S23', correcting the return air temperature of the warm shutdown internal machine every delta T time, and enabling the machine set to be in accordance with the return air temperature correction value T of the warm shutdown internal machine2 correctionAnd (6) performing operation judgment.
In step S21 ', the calculation formula of the temperature reduction temperature difference value Δ T1' from the time interval Δ T to the warm-up shutdown internal machine is as follows,
ΔT1′＝(T2-T1)/t′*Δt。
in step S22 ', the calculation formula of the amount Q' of heat leakage per time interval Δ t to the warm stop internal machine is,
Q′＝C1*[(Tm′/100)4-(T2/100)4]*A
wherein, C1A is the surface area of a heat exchanger of the shutdown internal machine when reaching the temperature according to experimental determination and is determined according to the specific structure of the shutdown internal machine;
the temperature rise temperature difference value delta T of the internal machine is stopped when the temperature reaches the temperature every delta T time2The formula for the calculation of' is that,
ΔT2′＝B*Q′/(C2*(3*Q1′/200)*ρ)
wherein B is a correction coefficient determined according to the installation form of the warm shutdown internal machine, and C is2Is an air state constant, Q1' is the rated capacity of the internal machine at the shutdown to temperature, and ρ is the air density.
In step S23', return air temperature correction value T of internal machine for warm stop2 correctionThe formula for calculating (a) is as follows,
T2 correction＝T2 last correction-ΔT1′+ΔT2′，
Wherein, T2 last correctionAnd the return air temperature correction value of the internal machine which is shut down to the temperature is obtained after the last delta t time correction.
Specifically, if aWhen the shutdown time T is equal to delta T after the internal machine stops at the temperature, the temperature reduction temperature difference value delta T is obtained1′＝(T2-T1) Temperature rise delta T, temperature rise delta T2′＝B*Q′/(C2*(3*Q1'/200). rho) to the return air temperature correction value T of the warm shutdown internal machine2 correction＝T2-ΔT1′+ΔT2′；
If the running time T of the whole machine meets the condition that T is not more than n delta T and T is less than (n +1) delta T, the return air temperature correction value T of the internal machine of the warm shutdown machine2 correction＝T2 last correction-ΔT1′+ΔT2', wherein, T2 last correctionIs the return air temperature corrected value obtained after the n-1 th correction, delta T1' is the temperature drop difference, delta T, of the internal machine in the nth to warm shutdown2' is the temperature rise difference value of the internal machine in the nth to warm shutdown. Can be further deduced from2 correction＝T2-∑ΔT1′+∑ΔT2', where Σ Δ T1' is the sum of temperature reduction temperature difference values of 0 to n times of the internal machine at the temperature stop, sigma delta T2' is the sum of temperature rise and temperature difference values of the internal machine for 0-n times when the machine is stopped at the temperature.
The method for detecting, correcting and controlling the return air temperature of the air conditioner integrates the time after the air conditioner is stopped at the temperature, the temperature rise rate of the internal machine at the time of the air conditioner is stopped at the temperature from the startup to the temperature, and the heat leakage quantity of the internal machine at the time of the air conditioner is calculated to the temperature correction deviation value of the internal machine at the temperature stop from the return air temperature value T at the time of the air conditioner is stopped at the temperature2Determining the return air temperature correction value T of the warm shutdown internal machine together with the temperature correction deviation value2 correction。
In this embodiment, the unit stops the internal machine according to the return air temperature correction value T2 correctionWhen the operation judgment is carried out, if the condition 2 is met: t is2 correction≤T2 is provided with+ΔT2setIf the condition 2 is not met, continuing to warm shutdown;
wherein, T2 is provided withTo reach the set temperature of the warm-up shutdown internal machine, Δ T2setAnd setting a temperature allowable fluctuation error value for the internal machine of the temperature shutdown machine.
Particularly, in this embodiment, if all the internal machines are turned off or shut down when reaching the temperature during the shutdown process of the internal machines, and the external machines are switched to the shutdown state from the operation, the air-conditioning return air temperature correction control is exited, and the unit is judged to operate according to the actually detected return air temperature of the internal machines which are shut down when reaching the temperature.
Example 3:
the embodiment provides a method for detecting, correcting and controlling air-conditioning return air temperature, which is used for correcting and controlling the return air temperature of an air-conditioning heating operation, when a part of internal machines are turned off, and when the part of internal machines are turned on and operated for a certain time and then are turned off and shut down at a temperature, the internal machines are turned off and shut down at the temperature. The method for correcting and controlling the return air temperature of the shutdown internal machine is the same as that in embodiment 1, and the method for correcting and controlling the return air temperature of the shutdown internal machine to the warm temperature is the same as that in embodiment 2, and the details are not repeated here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A detection and correction control method for air conditioner return air temperature is used for detection and correction of return air temperature when an air conditioner is in heating operation and part of internal machines are shut down or shut down to a temperature, and is characterized in that the correction control method comprises the following steps:
s1, before the whole machine is started, the return air temperature detection value T of each internal machine is recorded1；
S2, after partial internal machines are started, calculating temperature correction deviation values of the shutdown internal machines according to the running time of the complete machines and the heat leakage quantity of the shutdown internal machines, and calculating the return air temperature detection values T of the shutdown internal machines1Determining the return air temperature correction value T of the shutdown internal machine together with the temperature correction deviation value1 correction(ii) a And/or the presence of a gas in the gas,
s2', after the internal machine is started and is stopped at a temperature, the return air temperature value T when the machine is stopped at the temperature is recorded2Calculating the temperature correction deviation value of the internal machine of the warm shutdown according to the time after the internal machine of the warm shutdown from the startup to the warm shutdown and the temperature rise rate of the internal machine of the warm shutdown from the startup to the warm shutdown and the heat leakage quantity of the internal machine of the warm shutdown, wherein the temperature correction deviation value is calculated according to the time after the internal machine of the warm shutdown from the startup to theReturn air temperature value T when stopping at temperature2Determining the return air temperature correction value T of the warm shutdown internal machine together with the temperature correction deviation value2 correction。
2. The method for detecting, correcting and controlling return air temperature of an air conditioner according to claim 1,
step S2 specifically includes:
s21, after partial internal machines are started, the internal machines are shut down every interval delta T according to the temperature T in the running pipe of the whole machinemCalculating the heat leakage quantity Q of the shutdown internal machine;
s22, calculating a temperature correction deviation value delta T of the shutdown internal machine according to the heat leakage quantity Q of the shutdown internal machine at each interval delta T;
s23, correcting the return air temperature of the shutdown internal machine every delta T time, and enabling the unit to correct the return air temperature according to the return air temperature correction value T of the shutdown internal machine1 correctionAnd (6) performing operation judgment.
3. The method for detecting, correcting and controlling return air temperature of an air conditioner according to claim 2,
in step S21, the calculation formula of the amount of heat leakage Q of the internal machine during the time interval Δ t when the internal machine is turned off is as follows,
Q＝C1*[(Tm/100)4-(T1/100)4]*A
wherein, C1And A is the surface area of the heat exchanger of the shutdown internal machine.
4. The method for detecting, correcting and controlling return air temperature of an air conditioner according to claim 3,
in step S22, the calculation formula of the temperature correction deviation Δ T of the shutdown internal machine at each time interval Δ T is,
ΔT＝B*Q/(C2*(3*Q1/200)*ρ)
wherein B is a correction coefficient, C2Is an air state constant, Q1ρ is the air density for the rated capacity of the internal machine when the machine is turned off.
5. The method for detecting, correcting and controlling return air temperature of an air conditioner according to claim 4,
in step S23, the return air temperature correction value T for the off-internal unit1 correctionThe formula for calculating (a) is as follows,
T1 correction＝T1 last correction+ΔT
Wherein, T1 last correctionThe return air temperature correction value of the shutdown internal machine obtained after the last delta t time correction;
when the unit is judged to operate, if the condition 1 is met: t is1 correction≤T1 is provided with+ΔT1setIf the condition 1 is not met, the starting is not needed;
wherein, T1 is provided withSetting the starting temperature, Δ T, for the internal machine to be shut down1setAnd setting a temperature allowable fluctuation error value for the shutdown internal machine.
6. The detection and correction control method for return air temperature of air conditioner as claimed in any one of claims 1 to 5,
step S2' specifically includes:
s21', recording the return air temperature value T when the engine is stopped at a warm state2And the total time t' from start-up to warm-stop; after the machine is stopped at the temperature, the temperature reduction temperature difference value delta T after the machine is stopped at the temperature is calculated according to the temperature rise speed before the machine is stopped at the temperature at intervals delta T1′；
S22' after shutdown to warm, stopping the internal machine at the warm shutdown every delta T interval according to the temperature T in the running pipe of the whole machinem' calculating the heat leakage quantity Q ' of the warm shutdown internal machine, and calculating the temperature rise difference value delta T of the warm shutdown internal machine according to the heat leakage quantity Q ' of the warm shutdown internal machine2′；
S23', correcting the return air temperature of the warm shutdown internal machine every delta T time, and enabling the machine set to be in accordance with the return air temperature correction value T of the warm shutdown internal machine2 correctionAnd (6) performing operation judgment.
7. The method for detecting, correcting and controlling return air temperature of an air conditioner according to claim 6,
in step S21 ', the temperature reduction temperature difference value Δ T1' between every Δ T time and the warm-stop internal machine is calculated as,
ΔT1′＝(T2-T1)/t′*Δt。
8. the method for detecting, correcting and controlling return air temperature of an air conditioner according to claim 7,
in step S22 ', the calculation formula of the amount Q' of heat leakage per time interval Δ t to the warm stop internal machine is,
Q′＝C1*[(Tm′/100)4-(T2/100)4]*A
wherein, C1A is a heat exchange constant, and A is the surface area of a heat exchanger of the machine in the machine halt at the temperature;
the temperature rise temperature difference value delta T of the internal machine is stopped when the temperature reaches the temperature every delta T time2The formula for the calculation of' is that,
ΔT2′＝B*Q′/(C2*(3*Q1′/200)*ρ)
wherein B is a correction coefficient, C2Is an air state constant, Q1' is the rated capacity of the internal machine at the shutdown to temperature, and ρ is the air density.
9. The method for detecting, correcting and controlling return air temperature of an air conditioner according to claim 8,
in step S23', return air temperature correction value T of internal machine for warm stop2 correctionThe formula for calculating (a) is as follows,
T2 correction＝T2 last correction-ΔT1′+ΔT2′，
Wherein, T2 last correctionThe return air temperature correction value of the internal machine which is shut down to the temperature is obtained after the last delta t time correction;
when the unit is judged to operate, if the condition 2 is met: t is2 correction≤T2 is provided with+ΔT2setIf the condition 2 is not met, continuing to warm shutdown;
wherein, T2 is provided withTo bring the set temperature, delta, of the internal machine to a warm shutdownT2setAnd setting a temperature allowable fluctuation error value for the internal machine of the temperature shutdown machine.
10. The return air temperature detection, correction and control method of an air conditioner according to any one of claims 1 to 5 and 7 to 9,
if the internal machine is in the process of stopping at the temperature, the external machine is switched to a stop state from running, the air-conditioning return air temperature correction control is quitted, and the machine set is judged to run according to the actually detected return air temperature of the internal machine at the temperature stop.
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