CN1851337B - Control method for domestic multi-connection air conditioner low temperature heating outdoor unit frequency - Google Patents

Abstract

The invention offers an outer machine frequency control method used in air conditioning low temperature heat production. It separates refrigeration highest running frequency from heat production. Thehighest running frequency of compressor heat production is gained by calculating outer machine temperature and inner machine total power. It also adds heat production effect factor to optimize by controlling frequency.

Description

The control method of domestic multi-connection air conditioner low temperature heating outdoor unit frequency

Technical field

The control method of outdoor unit frequency when the present invention relates to a kind of air conditioner low temperature heating, the especially control method of outdoor unit frequency during domestic multi-connection air conditioner low temperature heating.

Background technology

Combined air conditioners belongs to a kind of of central air-conditioning, the outer machine of one or several that is meant connects the air-conditioning of realization different spaces air conditioning of the interior machine of many same models or different model, residential central air conditioning generally be an outer machine drag a plurality of in the small-sized central air-conditioning that moves of machines.

The heating method that present most of air-conditioning adopted is identical with refrigeration machine in itself, the direction difference of working medium circulation just, (can cryogenic refrigeration).Its operation principle that heats is: in heat pump, refrigerant is endothermic gasification in the heat exchanger of machine outside, by electric energy drive compression machine high temperature and high pressure gas is transported to interior machine, the heat release (absorb heat and acting in theory and equal to emit heat) of in interior machine heat exchanger, liquefying, the shuttling movement generation physical phase transition process of refrigerant, make heat constantly obtain exchange and transmit, make unit realize heating, freezing the replacing function by the valve switching.

The ability of compressor and frequency, environment temperature and system architecture all have relation.The ability of compressor must be consistent with the requirement capability of air-conditioning system.So just require the running frequency of compressor must be in suitable scope by the decision of environment temperature and system architecture.Under the situation that system architecture is determined, if outer machine environment temperature is crossed when low, the heat that absorbs in gasification of refrigerant is few generally, just requires the frequency of compressor to want suitable big, improve the acting ability of compressor, could satisfy the Capability Requirement of set interior machine.If underfrequency will cause effect undesirable.Otherwise if the frequency of compressor is excessive, the energy consumption of air-conditioning will increase, and the ability of system also may not have effective lifting.

Maximum running frequency is meant the maximum of the frequency-changeable compressor running frequency of qualification.Compressor allows the frequency of operation generally than higher, and in order to be complementary with air-conditioning system, we define compressor in the operating maximum frequency of operation of cooling and warming.

Present some domestic multi-connection air conditioner freezes and the maximum running frequency that the heats identical frequency values of all sampling, and separately control.Under identical system architecture state, low if maximum running frequency is set, when outdoor temperature was relatively lower, compressor can can't promote the acting ability because of frequency limited, and the heating effect of machine is relatively poor in causing.If maximum running frequency is set high, have during the refrigerating operaton worst hot case that can electric current to occur too high, compressor is caused damage.In addition, do not have the factor of machine-processed thermal effect in the control in the control of frequency, when this had caused indoor temperature relatively lower, the heating effect of interior machine was undesirable.

Summary of the invention

The present invention provides a kind of outdoor unit frequency control method that can improve heating effect under the lower situation of outdoor temperature in order to overcome above-mentioned deficiency.

The present invention solves the technical scheme that its technical problem takes: may further comprise the steps:

Whether 1) judge operational mode, be the heating operation pattern;

2) heat startup;

3) temperature T outside the sensing chamber _Out

4) calculate interior machine total capacity demand P _Total

5) by temperature T outside the sensing chamber _OutWith interior machine total capacity demand P _TotalCalculate the object run frequency f _Ref, and move to stable state by this frequency;

Step 3), 4 wherein) carries out simultaneously or is regardless of order successively carrying out.

After step 5), also comprise: the hot factor of interior mechanism is defined as correction value Δ f, utilizes this Δ f described object run frequency f _RefRevise.

Utilize this Δ f to described object run frequency f _RefRevise and be specially: with described object run frequency and described frequency correction value and be defined as final running frequency, promptly

f _out＝f _ref+Δf。

The correction value Δ f of described frequency can be by the mean value T of coiler temperature in each _zDecision.

Described object run frequency can draw by following formula operation:

f _ref＝C1(P _total-C2)+C3(7-T _out)+C4，

Wherein C1～C4 is a constant.

The correction value Δ f of described frequency can draw by following formula operation:

Wherein C5, C6 are constant.

Described outdoor temperature T _OutCan detect by the temperature sensor of the inlet side that is arranged on outer machine condenser and obtain.

The mean value T of coiler temperature in described _z, can the temperature sensor on the coiler detects in each by being arranged on, and calculate by averaging.

Machine total capacity demand P in described _TotalEqual the ability need P of machine in all _nSum, P _nBy calculated value P _{Rate_n}With parameter S _nCommon definite, this parameter S _nDifference by design temperature and indoor environment temperature is determined.

Machine total capacity demand P in the described calculating _TotalCan obtain by the following method:

The determined parameter of the difference of design temperature and indoor environment temperature is by S _nExpression, and be divided into 8 sections, respectively corresponding 0,1,2,3,4,5,6,7 these 8 constant parameters, S _nBe the temperature difference section parameter of machine in the n platform, n 〉=1 wherein, and poor according to design temperature and indoor environment temperature obtain the corresponding parameters value by the table of comparisons; Function power calculated value P in the n platform _{Rate_n}, be practical capacity by interior machine, just in a number of machine, by

P _{Rate_n}=a 10 * number,

Calculate, the power demand Pn of machine obtains by following formula in the n platform

P _n＝(S _n+1)P _{rate_n}

And pass through

$P_{\mathrm{total}}=\underset{n}{\mathrm{\Σ}}{P}_n$

Machine service ability demand P in calculating _Total

Calculate, the power demand Pn of machine obtains by following formula in the n platform

P _n＝(S _n+1)P _{rate_n}

And pass through

$P_{\mathrm{total}}=\underset{n}{\mathrm{\Σ}}{P}_n$

Machine service ability demand P in calculating _Total

The present invention separates by the maximum running frequency that will freeze and heat, in the heating operation pattern, the lower environment temperature that respective chamber/chambers is outer is by calculating the highest frequency that press is heated, and with this frequency operation, thereby improve the acting ability of press when low temperature.In addition, added the interior machine-processed thermal effect factor of the relevant parameter of machine-processed thermal effect in characterizing in the determining of outdoor unit frequency, equally by the control of frequency, machine-processed thermal effect is tending towards optimization in making.

Description of drawings

Fig. 1 is a flow chart of the present invention;

The specific embodiment

Implementation procedure of the present invention and is set at an outer machine with system architecture and drives three interior machine work as shown in Figure 1, and the present invention realizes by following steps:

1) after the user controlled the air-conditioning system start, by the operational mode after the master controller judgement start, whether setting present mode of operation was the heating operation pattern;

2) if present mode of operation is the heating operation pattern, then air-conditioning system begins to enter and heats start-up course;

3) the compressor work that enters in the outer machine of system's control is prepared, and simultaneously, the temperature sensor that control is fixed on the inlet side of outer machine condenser detects outdoor temperature T _Out

When 4) interior machine moved, the design temperature of every interior machine and the difference of indoor environment temperature were determined by parameter S _nRepresent that be the temperature difference section parameter of machine in the n platform, wherein, design temperature is operated control by the user, indoor environment temperature then obtains described temperature difference section parameter S by the temperature sensor detection that is arranged in the indoor set _nIn, n=1,2,3, represent the temperature difference section parameter of three interior machines, each temperature difference section parameter is divided into 8 sections, difference corresponding 0,1,2,3,4,5,6,7 these 8 constant parameters, as shown in table 2, and poor according to design temperature and indoor environment temperature, obtain corresponding parameters value S respectively by the table of comparisons 2 ₁, S ₂, S ₃, for example, when the difference of first indoor set design temperature and indoor environment temperature is 1.5 ℃, then corresponding S ₁Be 2, when the difference of second indoor set design temperature and indoor environment temperature is 1.8 ℃, then corresponding S ₂Be 3, the rest may be inferred for other each interior machines, when temperature difference just is when separating point value, to get more higher leveled temperature difference section parameter value;

5) function power calculated value P in the n platform _{Rate_n}, wherein n=1,2,3 is the practical capacities by interior machine, just in a number of machine, by

P _{Rate_n}=a 10 * number,

Calculate P respectively _{Rate_1}, P _{Rate_2}, P _{Rate_3}, the power demand P of machine in the n platform _n, n=1,2,3 wherein is again according to the P that calculates _{Rate_n}The S that determines in rapid with previous step _nObtain corresponding P by following formula ₁, P ₂, P ₃,

P _n＝(S _n+1)P _{rate_n}

And pass through

$P_{\mathrm{total}}=\underset{3}{\mathrm{\Σ}}{P}_n$

Machine service ability demand P in calculating _Total

6) by detected outdoor temperature value T in the step 3) _OutWith the interior machine total capacity P that calculates _Total, calculate the target frequency f of operation by following formula _Ref,

f _ref＝C1(P _total-C2)+C3(7-T _out)+C4，

Wherein C1～C4 is a constant, and outdoor machine of air-conditioner is with above-mentioned target frequency f _RefThe operation heating mode is until the frequency of compressor propradation arrival state more stably during from firm startups;

7) in each, be set with a temperature sensor on the liquid pipe of machine turnover refrigerant, detect the temperature of coiler position in each by described temperature sensor, and calculate the mean value T of three interior coiler temperature _z

8) the temperature-averaging value T that aforementioned calculation is gone out _z, calculate the correction value Δ f of frequency by following formula, promptly

, wherein C5, C6 are constant;

9) correction value of operational objective frequency and frequency is synthetic, obtain final running frequency, promptly

f _out＝f _ref+Δf

Make outdoor machine of air-conditioner continue operation, thereby realize external machine running frequency adjusting, machine-processed thermal effect in optimizing with this frequency;

10) repeating step 6 in the running)～8), the running frequency of air-conditioning in the process of whole heating operation constantly adjusted, after reaching design temperature, shut down or control shutdown by the user.

The present invention is equally applicable to n=1, be about to system architecture and be set at the situation that an outer machine only drives an interior machine job, or the outer machine of multi-section only drives the situation of an interior machine job.

More than during to multi-connection air conditioner low temperature heating provided by the present invention the control method of outdoor unit frequency be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (10)

1. the control method of outdoor unit frequency during a multi-connection air conditioner low temperature heating is characterized in that: may further comprise the steps:

Whether 1) judge operational mode, be the heating operation pattern;

2) heat startup;

3) temperature T outside the sensing chamber _Out

4) calculate interior machine total capacity demand P _Total

5) by temperature T outside the sensing chamber _OutWith interior machine total capacity demand P _TotalCalculate the object run frequency f _Ref, and move to stable state by this frequency;

Step 3), 4 wherein) carries out simultaneously or is regardless of order successively carrying out.

2. the control method of outdoor unit frequency is characterized in that during multi-connection air conditioner low temperature heating as claimed in claim 1, after step 5), also comprises: the hot factor of interior mechanism is defined as correction value Δ f, utilizes this Δ f to described object run frequency f _RefRevise.

3. the control method of outdoor unit frequency is characterized in that: utilize this Δ f to described object run frequency f during multi-connection air conditioner low temperature heating as claimed in claim 2 _RefRevise and be specially: with described object run frequency and described frequency correction value and be defined as final running frequency, promptly

f _out＝f _ref+Δf。

4. the control method of outdoor unit frequency during as claim 2 or 3 described multi-connection air conditioner low temperature heatings, it is characterized in that: the correction value Δ f of described frequency is by the mean value T of coiler temperature in each _zDecision.

5. the control method of outdoor unit frequency during as claim 1 or 2 or 3 described multi-connection air conditioner low temperature heatings, it is characterized in that: described operational objective frequency draws by following formula operation:

f _ref＝C1(P _total-C2)+C3(7-T _out)+C4，

Wherein C1～C4 is a constant.

6. the control method of outdoor unit frequency during multi-connection air conditioner low temperature heating as claimed in claim 4, it is characterized in that: the correction value Δ f of described frequency draws by following formula operation:

Wherein C5, C6 are constant.

7. the control method of outdoor unit frequency is characterized in that: described outdoor temperature T during as claim 1 or 2 or 3 described multi-connection air conditioner low temperature heatings _OutTemperature sensor detection by the inlet side that is arranged on outer machine condenser obtains.

8. the control method of outdoor unit frequency during multi-connection air conditioner low temperature heating as claimed in claim 4 is characterized in that: the mean value T of coiler temperature in described _z, the temperature sensor on the coiler detects in each by being arranged on, and calculates by averaging.

9. the control method of outdoor unit frequency during multi-connection air conditioner low temperature heating as claimed in claim 5 is characterized in that: machine total capacity demand P in described _TotalEqual the ability need P of machine in all _nSum, P _nBy calculated value P _{Rate_n}With parameter S _nCommon definite, this parameter S _nDifference by design temperature and indoor environment temperature is determined.

10. the control method of outdoor unit frequency during multi-connection air conditioner low temperature heating as claimed in claim 9 is characterized in that: machine total capacity demand P in the described calculating _TotalObtain by the following method:

The determined parameter of the difference of design temperature and indoor environment temperature is by S _nExpression, and be divided into 8 sections, respectively corresponding 0,1,2,3,4,5,6,7 these 8 constant parameters, S _nBe the temperature difference section parameter of machine in the n platform, n 〉=1 wherein, and poor according to design temperature and indoor environment temperature obtain the corresponding parameters value by the table of comparisons; Function power calculated value P in the n platform _{Rate_n}, be practical capacity by interior machine, just in a number of machine, by

P _{Rate_n}=a 10 * number,

Calculate, the power demand Pn of machine obtains by following formula in the n platform

P _n＝(S _n+1)P _{rate_n}

And pass through

$P_{\mathrm{total}}=\underset{n}{\mathrm{\Σ}}{P}_n$

Machine service ability demand P in calculating _Total

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