CN113587179B - Multi-split air conditioning system - Google Patents
Multi-split air conditioning system Download PDFInfo
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- CN113587179B CN113587179B CN202110845565.XA CN202110845565A CN113587179B CN 113587179 B CN113587179 B CN 113587179B CN 202110845565 A CN202110845565 A CN 202110845565A CN 113587179 B CN113587179 B CN 113587179B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/12—Tube and panel arrangements for ceiling, wall, or underfloor heating
- F24D3/14—Tube and panel arrangements for ceiling, wall, or underfloor heating incorporated in a ceiling, wall or floor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention discloses a multi-split air conditioning system which comprises an outdoor unit, an indoor unit, a floor heating water module and a controller. According to the multi-split air conditioning system, the controller is configured to distribute the number of the outdoor units to each floor heating according to the ratio of the weight of water in each floor heating to the sum of the weights of water in all floor heating, so that the system is ensured to operate stably, and frequent shutdown is avoided. According to the multi-split air conditioning system, the controller is configured to distribute the number of outdoor units to the floor heating units in the room where each indoor unit is located according to the ratio of the number of indoor units to the sum of the number of indoor units, so that the control is simple and convenient, the system is ensured to run stably, and frequent shutdown is avoided.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a multi-split air conditioning system.
Background
With the saturation of the multi-online market, the floor heating market is continuously expanded due to the following advantages of floor heating.
(1) Comfort, sanitation and health care: the ground radiation heating is the most comfortable heating mode, the indoor ground surface temperature is uniform, the room temperature is gradually decreased from bottom to top, and good feeling of warm feet and cool head is provided for people; dirty air convection is not easy to be caused, and indoor air is clean; improving blood circulation and promoting metabolism.
(2) Saving space and beautifying rooms: the heating radiator and the branch pipe thereof are eliminated indoors, the use area is increased, and the decoration and the household arrangement are convenient.
(3) High-efficiency and energy-saving: the radiation heating mode has higher heat efficiency than the convection heating mode, and the heat is concentrated in the height beneficial to the human body; the heat loss in the transmission process is small; the low-temperature ground radiation heating can be controlled by individual household and individual chamber, and the user can regulate and control according to the condition, thereby effectively saving energy.
(4) The thermal stability is good: the ground heating ground layer and the concrete layer have large heat storage capacity and good thermal stability, and the indoor temperature changes slowly under the condition of intermittent heating.
(5) The operation cost is low: compared with other heating equipment, the energy is saved by 20%, low-temperature hot water resources or an electricity price policy can be fully utilized, and the operating cost is reduced.
(6) The service life is long: the plastic pipe or heating cable is buried underground, has no scaling, corrosion and artificial damage, and has service life synchronous with that of building. And compared with convection heat supply, the maintenance and replacement cost is saved.
In the initial stage of unit operation, when only the floor heating is operated, the floor heating of each room is output with the same power.
However, since the floor heating in each room is different, the ability required to individually control the floor heating in each room is also different. If the floor heating of each room is output with the same power, the problem that if only one floor heating of a small room is opened, the water temperature rises too fast, frequent shutdown is easy to happen, and the unit operation is unstable can be caused.
Disclosure of Invention
The invention provides a multi-split air conditioning system, which solves the problem of unstable system operation in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a multi-split air conditioning system, comprising:
an outdoor unit;
an indoor unit group including a plurality of indoor units connected in parallel;
the floor heating unit comprises a plurality of floor heating units connected in parallel;
the floor heating water module is connected with the outdoor unit through a refrigerant pipeline and is connected with the floor heating unit through a water pipeline;
the controller is configured to distribute the number of outdoor units to each floor heater according to the ratio of the weight of the water in each floor heater to the sum of the weights of the water in all floor heaters;
or the controller is configured to allocate the number of outdoor units to the floor heating in the room where each indoor unit is located according to the ratio of the number of indoor units to the sum of the number of indoor units.
Further, the method for calculating the weight of the water in the floor heating comprises the following steps:
selecting the ith floor heating to operate, keeping the rest floor heating and all indoor units from operating, operating the outdoor unit, and starting timing; i =1,2,3, … …, n; wherein n is the number of floor heating;
when the water temperature at the water inlet/water outlet of the local heating water module rises by delta T, the timing is stopped, and the timing time is b i Hours;
calculation run b i Energy consumed in hours Q i 1=a*b i Wherein a is the heating capacity of the multi-split air conditioning system; q i The unit of 1 is kilowatt-hour;
calculating Q i 2=1000*3600* Q i 1，Q i The unit of 2 is joule;
calculating formula Q from the heat i 2=c*M i * Delta T, calculating the weight M of water in the ith floor heating i (ii) a Wherein c is the specific heat capacity of water.
Still further, the method for calculating the weight sum of water in all floor heaters comprises the following steps:
all floor heating units are operated, all indoor units are not operated, the outdoor unit is operated, and timing is started;
when the water temperature at the water inlet/water outlet of the local heating water module rises by delta T, stopping timing, wherein the timing time is B hours;
calculating energy Q1= a B consumed in B hours of operation, wherein a is the heating capacity of the multi-split air conditioning system; q1 is in kilowatt-hours;
calculate Q2=1000 × 3600 × q1, Q2 in joules;
from the heat calculation formula Q2= c M General (1) * Delta T, calculating the weight and M of water in all floor heating systems General assembly (ii) a Wherein c is the specific heat capacity of water.
Further, if M is General assembly And M 1 + M 2 + M 3 + ……+ M n If the absolute value of the difference is more than or equal to the set threshold value, the weight of the water in each floor heating and the weight sum M of the water in all the floor heating are recalculated General assembly 。
Furthermore, an electronic expansion valve is arranged on a refrigerant pipeline connecting the floor heating water module and the outdoor unit;
when the indoor unit and the floor heating are simultaneously opened, determining the initial opening EVWsta of the electronic expansion valve according to the ratio of the total matching HP _ inall of the running indoor unit to the matching HP _ OU of the outdoor unit.
Further, the determining the initial opening EVWsta of the electronic expansion valve according to the ratio of the total matching HP _ all of the operating indoor units to the matching HP _ OU of the operating outdoor units specifically includes the following steps:
acquiring the total number HP _ inall of the running indoor units and the number HP _ OU of the running outdoor units;
calculating a ratio R = HP _ inall/HP _ OU;
determining an initial opening EVWsta according to the relation between the ratio R and the first set ratio, the second set ratio and the third set ratio:
EVWsta = a first set opening degree when R < a first set ratio;
when the first set ratio is less than or equal to R and less than the second set ratio, EVWsta = a second set opening degree;
when the second set ratio is less than or equal to R and less than a third set ratio, EVWsta = a third set opening degree;
when the third set ratio is less than or equal to R, EVWsta = a fourth set opening degree;
wherein the first set ratio is more than 0 and less than the second set ratio and less than the third set ratio and less than 1;
EVWmax is larger than or equal to a first set opening degree, a second set opening degree, a third set opening degree and a fourth set opening degree, and the fourth set opening degree is larger than 0; EVWmax is the maximum opening degree of the electronic expansion valve.
Still further, after the initial opening EVWsta of the electronic expansion valve is determined, the following steps are performed at set time intervals:
calculating the difference between the set temperature of each operating indoor unit and the actual indoor temperature, and selecting the maximum value delta TLmax;
determining an opening increment (delta) Evw of the electronic expansion valve according to the maximum value (delta) TLmax, wherein a target opening of the electronic expansion valve = a current opening + (delta) Evw;
and adjusting the opening degree of the electronic expansion valve to a target opening degree.
Furthermore, the determining the opening increment Δ Evw of the electronic expansion valve according to the maximum value Δ TLmax specifically includes:
when Δ TLmax is less than or equal to the first setting difference, Δ Evw = a fifth setting opening;
when the first setting difference Δ TLmax is less than or equal to the second setting difference, the Δ Evw = a sixth setting opening;
when the second setting difference Δ TLmax is less than or equal to the third setting difference, Δ Evw = a seventh setting opening;
when the third setting difference value (Δ TLmax) is less than or equal to the fourth setting difference value (Δ Evw = eighth setting opening);
(iv) when the fourth setting difference Δ t TLmax, Δ Evw = a ninth setting opening;
wherein the first set difference is less than the second set difference is less than the third set difference is less than the fourth set difference;
the fifth set opening degree > the sixth set opening degree > the seventh set opening degree > the eighth set opening degree > the ninth set opening degree.
Furthermore, a wire controller is arranged in each room, and a switch is arranged at the water inlet of each floor heating; the wire controller controls the operation of the indoor unit and the on-off of the switch.
Furthermore, the floor heating water module is a shell-and-tube heat exchanger, and a shell of the floor heating water module is provided with a water inlet, a water outlet, a refrigerant inlet and a refrigerant outlet; a water heat exchange channel communicated with the water inlet and the water outlet and a refrigerant heat exchange channel communicated with the refrigerant inlet and the refrigerant outlet are arranged in the shell of the water heater, and the water inlet and the water outlet are connected with the water pipeline; the refrigerant inlet and the refrigerant outlet are connected with the refrigerant pipeline.
Compared with the prior art, the technical scheme of the invention has the following technical effects: according to the multi-split air conditioning system, the controller is configured to distribute the number of the outdoor units to each floor heating according to the ratio of the weight of water in each floor heating to the sum of the weights of water in all floor heating, so that the system is ensured to operate stably, and frequent shutdown is avoided. According to the multi-split air conditioning system, the controller is configured to distribute the number of outdoor units to the floor heating units in the room where each indoor unit is located according to the ratio of the number of indoor units to the sum of the number of indoor units, so that the control is simple and convenient, the system is ensured to run stably, and frequent shutdown is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of a multi-split air conditioning system according to the present invention;
fig. 2 is a schematic structural diagram of a floor heating water module of a multi-split air conditioning system according to an embodiment of the invention;
fig. 3 is a flowchart of an embodiment of a floor heating water weight calculation method of a multi-split air conditioning system according to the invention;
fig. 4 is a flowchart illustrating an embodiment of all of the heating water weights and the calculation method of the multi-split air conditioning system according to the present invention;
fig. 5 is a flowchart illustrating an exemplary embodiment of determining an initial opening degree of an electronic expansion valve in a multi-split air conditioning system according to the present invention;
fig. 6 is a flowchart illustrating an exemplary embodiment of an opening control of an electronic expansion valve of a multi-split air conditioning system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The multi-split air conditioning system is one of central air conditioners and can be called as 'one split multiple', wherein one outdoor unit refers to one outdoor unit, a plurality of indoor units refer to a plurality of indoor units, the outdoor unit adopts an air cooling heat exchange mode, and the indoor units realize indoor refrigeration in an evaporation heat exchange mode.
The air conditioning system performs a refrigeration cycle and a heating cycle of the air conditioning system by using a compressor, a condenser, an expansion valve, and an evaporator, performs control by a controller, realizes flow direction control of refrigerant, opening degree control of the expansion valve, and the like. The refrigeration cycle and the heating cycle include a series of processes involving compression, condensation, expansion, and evaporation, and supply refrigerant to air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioning system may regulate the temperature of the indoor space throughout the cycle.
The air conditioning system outdoor unit refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the air conditioning system indoor unit includes an indoor heat exchanger, and an expansion valve may be provided in the air conditioning system outdoor unit or the indoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioning system is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioning system is used as a cooler in a cooling mode.
The multi-split air conditioning system of the embodiment includes an outdoor unit, an indoor unit, a floor heating water module, a controller, and the like, as shown in fig. 1 and fig. 2.
And the outdoor unit is provided with a compressor, a four-way valve, an outdoor heat exchanger and an outdoor fan.
An indoor unit group including a plurality of indoor units connected in parallel; each indoor unit comprises an indoor heat exchanger and an indoor fan. The air pipe of the outdoor unit is connected with the air pipe of each indoor unit, and the liquid pipe of the outdoor unit is connected with the liquid pipe of each indoor unit.
The floor heating unit comprises a plurality of floor heating units connected in parallel; the floor heating units are in one-to-one correspondence with the indoor units.
The floor heating water module is connected with the outdoor unit through a refrigerant pipeline and is connected with the floor heating unit through a water pipeline.
The refrigerant discharged by the outdoor unit is divided into two paths, wherein one path of refrigerant flows to the indoor unit and flows back to the outdoor unit after heat exchange; and the other path of refrigerant flows to the floor heating water module, exchanges heat and then flows back to the outdoor unit. Therefore, the refrigerant pipeline between the outdoor unit and the indoor unit and the refrigerant pipeline between the outdoor unit and the floor heating water module are connected in parallel.
An indoor unit, a floor heating unit and a wire controller are arranged in each room, and a refrigerant pipeline is connected with the indoor unit and is consistent with the general multi-split air conditioner; the water pipeline is connected with the floor heating system, and a switch is arranged at a water inlet of each floor heating system and used for controlling the on-off of the water inlet, so that each room can independently control the indoor unit and the floor heating system. The wire controller is respectively connected with the indoor unit and the switch, controls the running of the indoor unit and the on-off of the switch, conveniently controls the running of the indoor unit and the running of the floor heating system, and is convenient for users to use. Suppose there are n rooms, all have an indoor set, ground heating, a drive-by-wire ware in every room, and the indoor set is n in total promptly, and ground heating is n in total.
The floor heating water module of this embodiment is shell and tube heat exchanger, and the thermal efficiency is high, and the heat transfer is even. The floor heating water module is provided with a shell, and the shell is provided with a water inlet, a water outlet, a refrigerant inlet and a refrigerant outlet; the shell of the device is internally provided with a water heat exchange channel communicated with a water inlet and a water outlet and a refrigerant heat exchange channel communicated with a refrigerant inlet and a refrigerant outlet, wherein the water inlet and the water outlet are connected with a water pipeline; the refrigerant inlet and the refrigerant outlet are connected with a refrigerant pipeline. Water in the water heat exchange channel exchanges heat with a refrigerant in the refrigerant heat exchange channel, and after heat exchange, water in the water heat exchange channel enters the floor heating system through the water pipeline. The water heat exchange channel and the refrigerant heat exchange channel are wound together, or the refrigerant heat exchange channel is positioned inside the water heat exchange channel, so that the contact area of the two channels is increased, and the heat exchange efficiency is improved.
And a controller controlling the operation of the entire multi-split air conditioning system. The controller is configured to assign a number of outdoor units to each floor heating based on a ratio of the weight of water in each floor heating to the sum of the weights of water in all floor heating.
For example, when the floor heating of a certain room is operated independently, if the weight of water in the floor heating is small and the ratio of the weight of water in all the floor heating to the sum of the weight of water in all the floor heating is small, the number of outdoor units distributed to the floor heating is small, and the multi-split air conditioner can be operated with a very low frequency to control the floor heating; therefore, the multi-split air conditioner can stably operate and save more energy.
The multi-split air conditioning system of the embodiment distributes the outdoor units for each floor heating according to the ratio of the weight of water in each floor heating to the weight of water in all floor heating, ensures the stable operation of the system and avoids frequent shutdown.
A temperature sensor Twi and a water pump P are arranged at a water inlet/outlet of the floor heating water module, and an electronic expansion valve EVW is arranged on a refrigerant pipeline connected with the floor heating water module and the outdoor unit so as to control the flow of the refrigerant in the refrigerant pipeline.
In the embodiment, the method for calculating the weight of water in the floor heating includes the following steps, as shown in fig. 3.
Step S11: and selecting the ith floor heating to operate, enabling the rest floor heating units and all indoor units not to operate, enabling the outdoor units to operate, enabling the water temperature of the water inlet/water outlet of the floor heating water module to be T1 at the moment, and starting timing.
Wherein i =1,2,3, … …, n; wherein n is the number of floor heating.
Step S12: when the water temperature at the water inlet/water outlet of the local heating water module rises by delta T, the timing is stopped, and the timing time is b i And (4) hours. At the moment, the water temperature of a water inlet/a water outlet of the floor heating water module is T2, and delta T = T2-T1.
Step S13: operation b of computerized multi-split air conditioning system i Energy consumed in hours Q i 1=a*b i Wherein a is the heating capacity of the multi-split air conditioning system; q i The unit of 1 is kilowatt-hour.
Step S14: calculating Q i 2=1000*3600*Q i 1，Q i The unit of 2 is joule. This step is mainly used for energy unit conversion.
Step S15: calculating formula Q from the heat i 2=c*M i * Delta T, calculating the weight M of water in the ith floor heating i (ii) a Wherein c is the specific heat capacity of water and is a known quantity.
Through the steps S11-S15, the value of i is from 1 to n, the weight of water in each floor heating is calculated, and the method is simple, convenient and accurate and is easy to control and calculate.
In the present embodiment, the calculation method of the sum of the weights of water in all floor heaters includes the following steps, which are shown in fig. 4.
Step S21: all floor heating units are operated, all indoor units are not operated, the outdoor unit is operated, and timing is started. At the moment, the water temperature of the water inlet/outlet of the floor heating water module is T3.
Step S22: and when the water temperature at the water inlet/water outlet of the local heating water module rises by delta T, stopping timing, wherein the timing time is B hours. At the moment, the water temperature of a water inlet/a water outlet of the floor heating water module is T4, and delta T = T4-T3.
Step S23: calculating energy Q1= a B consumed by the multi-split air-conditioning system in B hours of operation, wherein a is the heating capacity of the multi-split air-conditioning system; q1 is in kilowatt-hours.
Step S24: q2=1000 × 3600 × q1, the unit of Q2 is joule. This step is mainly used for energy unit conversion.
Step S25: from the heat calculation formula Q2= c M General assembly * Delta T, calculating the weight and M of water in all floor heating systems General assembly (ii) a Wherein c is the specific heat capacity of water and is a known quantity.
Through the steps S21 to S25, the weight and M of the water in all the floor heating systems are calculated General assembly And is convenient and accurate.
The weight sum M of water calculated in steps S21 to S25 General assembly Adding up the weight of water in each floor heating (i.e. M) 1 + M 2 + M 3 + ……+ M n ) Theoretically identical. If M is General assembly And M 1 + M 2 + M 3 + ……+ M n If the absolute value of the difference is larger than or equal to the set threshold, the calculated weight error of the floor heating water is large, the weight of the water in each floor heating is recalculated through S11-S15, and the weight of the water in all the floor heating and the M are recalculated through S21-S25 General (1) To ensure the weight and M of water in each floor heating General assembly The accuracy of (2).
And distributing the number of outdoor units for each floor heater according to the ratio of the weight of the water in each floor heater to the sum of the weights of the water in all the floor heaters. Controller according to M i /M General assembly And distributing the outdoor unit number for the ith floor heating. Thus, the allocation of wading capacity to floor heating may be in terms of M i /M General assembly To calculate.
The multi-split air conditioning system of the embodiment estimates the floor heating water quantity of different rooms through an algorithm, and then distributes the capacity of the floor heating of the different rooms, namely distributes the wading capacity according to the floor heating water quantity.
When the indoor unit and the ground heating operate simultaneously, the outdoor unit number (capacity) HP _ OU is divided into two parts, one part of capacity is provided for the indoor unit (which can be recorded as the air cooling system capacity HP _ OU _1 of the outdoor unit), and the other part of capacity is provided for the ground heating (which can be recorded as the water system capacity HP _ OU _2 of the outdoor unit).
HP_OU= HP_OU_1+ HP_OU_2。
If all of the indoor units do not operate, the outdoor unit number HP _ OU is provided to the floor heating in its entirety, i.e., HP _ OU _1=0, HP _ou _ _2= HP _ou.
If all floor heating systems do not run, the outdoor unit number HP _ OU is provided for the indoor unit, namely HP _ OU _2=0; HP _ OU _1= HP_ou.
Thus, according to M i /M General assembly The outdoor unit number of the ith floor heating is as follows: HP _ OU _2*M i /M General assembly 。
An electronic expansion valve EVW is arranged on a refrigerant pipeline connected with the floor heating water module and the outdoor unit, and when the indoor unit and the floor heating are opened simultaneously, the opening degree of the electronic expansion valve EVW controls the amount of refrigerant entering the floor heating water module, so that the distribution of the number of the outdoor units is influenced.
The total number of the operating indoor units is different and the number of the required outdoor units is different. When the indoor unit and the floor heating are simultaneously opened, determining the initial opening EVWsta of the electronic expansion valve according to the ratio HP _ all/HP _ OU of the total matching number HP _ all of the running indoor units to the matching number HP _ OU of the outdoor units.
And determining the initial opening degree EVWsta of the electronic expansion valve EVW according to the HP _ inall/HP _ OU, and preferentially ensuring the effect of the indoor unit.
In this embodiment, the determining the initial opening EVWsta of the electronic expansion valve according to the ratio of the total indoor unit matching HP _ all to the outdoor unit matching HP _ OU includes the following steps, as shown in fig. 5.
And S31, acquiring the total matching HP _ inall of the running indoor units and the outdoor unit matching HP _ OU.
And S32, calculating a ratio R = HP _ inall/HP _ OU.
Step S33, determining the initial opening EVWsta of the electronic expansion valve according to the relation between the ratio R and the first set ratio, the second set ratio and the third set ratio:
(1) EVWsta = a first set opening degree when R < a first set ratio;
(2) When the first set ratio is less than or equal to R and less than the second set ratio, EVWsta = a second set opening degree;
(3) When the second set ratio is less than or equal to R and less than a third set ratio, EVWsta = a third set opening degree;
(4) When the third set ratio is less than or equal to R, EVWsta = a fourth set opening degree;
wherein the first set ratio is more than 0 and less than the second set ratio and less than the third set ratio and less than 1;
EVWmax is larger than or equal to a first set opening degree, a second set opening degree, a third set opening degree and a fourth set opening degree, wherein the first set opening degree is larger than the second set opening degree, the third set opening degree is larger than the fourth set opening degree, and the fourth set opening degree is larger than 0; EVWmax is the maximum opening degree of the electronic expansion valve. The unit of the opening is pls.
By designing the above S31 to S33, the initial opening degree of the electronic expansion valve is determined according to the magnitude relationship between the ratio R and the first set ratio, the second set ratio, and the third set ratio, the determination is accurate, a relatively accurate initial opening degree can be obtained, and the accurate control of the initial opening degree of the electronic expansion valve is realized.
It can be seen that the larger the total number of running indoor units is, the larger the ratio R is, the smaller the initial opening EVWsta of the electronic expansion valve is, the smaller the amount of refrigerant entering the floor heating water module is, the smaller the number of outdoor units allocated to the floor heating is, and the larger the number of outdoor units allocated to the indoor units is, so as to preferentially ensure the heating effect of the indoor units and improve the user experience.
In the present embodiment, the first set ratio =10%, the second set ratio =20%, the third set ratio =30%, the first set opening =100% EVWmax, the second set opening =60% EVWmax, the third set opening =40% EVWmax, and the fourth set opening =20% EVWmax. Namely:
EVWsta =100% EVWmax when R < 10%;
when R is more than or equal to 10% and less than 20%, EVWsta =60% EVWmax;
when R is more than or equal to 20% and less than 30%, EVWsta =40% EVWmax;
when 30% ≦ R, EVWsta =20% EVWmax.
By selecting the value, more accurate initial opening degree can be obtained, and the initial opening degree of the electronic expansion valve is more accurately controlled.
After the initial opening EVWsta of the electronic expansion valve is determined, the following steps are performed at set time intervals (e.g., 1 minute), as shown in fig. 6.
Step S41: the difference between the set temperature of each operating indoor unit and the actual temperature of the room is calculated and the maximum value Δ TLmax is selected from these differences.
Step S42: and determining an opening increment (delta) Evw of the electronic expansion valve according to the maximum value (delta) TLmax, wherein the target opening of the electronic expansion valve = the current opening (delta) + Evw.
Step S43: and adjusting the opening degree of the electronic expansion valve to a target opening degree.
Through designing S41-S43, the maximum value delta TLmax in the difference is calculated, then the opening delta Evw of the electronic expansion valve is determined, the target opening is adjusted, and the opening of the electronic expansion valve is accurately controlled to meet the effect of the indoor unit.
In this embodiment, determining the opening delta Δ Evw of the electronic expansion valve according to the maximum value Δ TLmax, specifically includes:
(1) When Δ TLmax is less than or equal to the first setting difference, Δ Evw = a fifth setting opening;
(2) When the first setting difference value (Δ TLmax) is less than or equal to the second setting difference value (Δ Evw = sixth setting opening);
(3) When the second setting difference Δ TLmax is less than or equal to the third setting difference, the Δ Evw = a seventh setting opening degree;
(4) When the third setting difference value (Δ TLmax) is less than or equal to the fourth setting difference value (Δ Evw = eighth setting opening);
(5) When the fourth setting difference value Δ TLmax, Δ Evw = the ninth setting opening;
wherein the first set difference is less than the second set difference and less than the third set difference and less than the fourth set difference;
the fifth set opening degree > the sixth set opening degree > the seventh set opening degree > the eighth set opening degree > the ninth set opening degree.
According to the size relation between the delta TLmax and the first setting difference, the second setting difference, the third setting difference and the fourth setting difference, the opening increment delta Evw is determined, the accurate delta Evw can be obtained, and then the opening of the electronic expansion valve can be accurately controlled, so that the effect of the indoor unit is met, and the user experience is improved.
The larger the difference between the set temperature of the running indoor unit and the actual indoor temperature is, the more the outdoor unit number required to be allocated to the indoor unit is, and the less the outdoor unit number allocated to the floor heating is, so that the smaller the opening degree of the electronic expansion valve is required to be, the smaller the Δ Evw is required to be, the effect of the indoor unit is preferentially ensured, and the user experience is improved.
In this embodiment, the first set difference =1, the second set difference =2, the third set difference =3, the fourth set difference =4, the fifth set opening = + (0.35% × EVWmax), the sixth set opening = + (0.1% × EVWmax), the seventh set opening = - (0.35% × EVWmax), the eighth set opening = - (0.75% × EVWmax), and the ninth set opening = - (1.5% × EVWmax). Namely:
when Δ TLmax is less than or equal to 1, Δ Evw = + (0.35%. Left EVWmax);
Δ Evw = + (0.1%. EVWmax) when 1 <Δtlmax ≦ 2;
Δ Evw = - (0.35%. EVWmax) when 2 <Δtlmax ≦ 3;
Δ Evw = - (0.75%. EVWmax) when 3 <Δtlmax ≦ 4;
when 4 <Δtlmax, Δ Evw = - (1.5%. Dvwmax).
By selecting the value, more accurate opening increment delta Evw can be obtained, and the opening of the electronic expansion valve is more accurately controlled.
The multi-split air conditioning system of the embodiment can realize the functions of refrigerating, heating, dehumidifying and the like of the indoor unit, can realize the function of heating by floor heating, can simultaneously use the mixed heating of the indoor unit and the floor heating, and simultaneously uses the comfortable dehumidification of the indoor unit and the floor heating.
Example II,
The multi-split air conditioning system of the second embodiment is different from the first embodiment in that: the controller is configured to distribute the outdoor unit number to the floor heating in the room where each indoor unit is located according to the ratio of the number of the indoor units to the sum of the number of all the indoor units.
Suppose that there are n rooms, each room has an indoor unit and a floor heating, that is, there are n indoor units and n floor heating.
HP _ in _ j represents the number of pieces of the j-th indoor unit; j =1,2,3, … …, n; wherein n is the number of the indoor units. HP _ in represents the sum of the numbers of all indoor units (n indoor units).
HP _ in _1, HP _ in _2, HP _ in _3, … …, and HP _ in _ n respectively indicate the number of indoor units 1,2,3, … …, and n.
And the controller distributes the outdoor unit number for the floor heating in the room where the jth indoor unit is located according to the ratio HP _ in _ j/HP _ in.
The number of outdoor units distributed to the floor heating in the room where the jth indoor unit is located according to the HP _ in _ j/HP _ in is as follows: HP _ OU _2 _ HP _in _j/HP _ in.
HP _ OU _2 represents the number of outdoor units allocated to floor heating, which has already been described in the first embodiment and will not be described herein again.
A method for determining an initial opening EVWsta of the electronic expansion valve EVW, a method for determining an opening delta EVW, and an opening control of the electronic expansion valve are described in the first embodiment, and are not described herein again.
The multi-split air conditioning system of the embodiment allocates the outdoor unit number to the floor heating in the room where each indoor unit is located according to the ratio of the number of the indoor units to the sum of the number of the indoor units, is simple and convenient to control, ensures stable operation of the system, and avoids frequent shutdown.
Therefore, the multi-split air conditioning system can estimate the capacity required by floor heating of the room according to the number of indoor units in different rooms, and is simple, convenient and easy to control.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A multi-split air conditioning system comprising:
an outdoor unit;
an indoor unit group including a plurality of indoor units connected in parallel;
the floor heating unit comprises a plurality of floor heating units connected in parallel;
the floor heating water module is connected with the outdoor unit through a refrigerant pipeline and is connected with the floor heating unit through a water pipeline;
it is characterized by also comprising:
the controller is configured to distribute the number of outdoor units to each floor heating according to the ratio of the weight of water in each floor heating to the sum of the weights of water in all floor heating;
the method for calculating the weight sum of water in all floor heaters comprises the following steps:
all floor heating units are operated, all indoor units are not operated, the outdoor unit is operated, and timing is started;
when the water temperature of the water inlet/water outlet of the local heating water module rises by delta T, stopping timing, wherein the timing time is B hours;
calculating energy Q1= a B consumed in B hours of operation, wherein a is the heating capacity of the multi-split air conditioning system; q1 is in kilowatt-hours;
calculate Q2=1000 × 3600 × q1, Q2 in joules;
from the heat calculation formula Q2= c M General assembly * Delta T, calculating the weight and M of water in all floor heating systems General assembly (ii) a Wherein c is the specific heat capacity of water.
2. A multi-split air conditioning system as set forth in claim 1, wherein: the method for calculating the weight of water in the floor heater comprises the following steps:
selecting the ith floor heating to operate, keeping the rest floor heating and all indoor units from operating, operating the outdoor unit, and starting timing; i =1,2,3, … …, n; wherein n is the number of floor heating;
when the water temperature at the water inlet/water outlet of the local heating water module rises by delta T, the timing is stopped, and the timing time is b i Hours;
calculation run b i Energy consumed in hours Q i 1=a*b i Wherein a is the heating capacity of the multi-split air conditioning system; q i Unit of 1 is kilowatt-hour;
calculating Q i 2=1000*3600* Q i 1，Q i The unit of 2 is joule;
calculating formula Q from the heat i 2=c*M i * Delta T, calculating the weight M of water in the ith floor heating i (ii) a Wherein c is the specific heat capacity of water.
3. A multi-split air conditioning system as set forth in claim 1, wherein:
if M is General (1) And M 1 + M 2 + M 3 + ……+ M n If the absolute value of the difference is more than or equal to the set threshold value, the weight of the water in each floor heating and the weight sum M of the water in all the floor heating are recalculated General assembly 。
4. A multi-split air conditioning system as set forth in claim 1, wherein: an electronic expansion valve is arranged on a refrigerant pipeline connecting the floor heating water module and the outdoor unit;
when the indoor unit and the floor heating are simultaneously opened, determining the initial opening EVWsta of the electronic expansion valve according to the ratio of the total matching HP _ inall of the running indoor unit to the matching HP _ OU of the outdoor unit.
5. The multi-split air conditioning system as claimed in claim 4, wherein: the method for determining the initial opening EVWsta of the electronic expansion valve according to the ratio of the total matching HP _ inoll of the running indoor unit to the matching HP _ OU of the outdoor unit specifically comprises the following steps:
acquiring the total number HP _ inall of the running indoor units and the number HP _ OU of the running outdoor units;
calculating a ratio R = HP _ inall/HP _ OU;
determining an initial opening EVWsta according to the relation between the ratio R and the first set ratio, the second set ratio and the third set ratio:
EVWsta = a first set opening degree when R < a first set ratio;
when the first set ratio is less than or equal to R and less than the second set ratio, EVWsta = a second set opening degree;
when the second set ratio is less than or equal to R and less than a third set ratio, EVWsta = a third set opening degree;
when the third set ratio is less than or equal to R, EVWsta = a fourth set opening degree;
wherein the first set ratio is more than 0 and less than the second set ratio and less than the third set ratio and less than 1;
EVWmax is larger than or equal to a first set opening degree, a second set opening degree, a third set opening degree and a fourth set opening degree, and the fourth set opening degree is larger than 0; EVWmax is the maximum opening degree of the electronic expansion valve.
6. The multi-split air conditioning system as claimed in claim 4, wherein: after the initial opening EVWsta of the electronic expansion valve is determined, the following steps are executed at set time intervals:
calculating the difference between the set temperature of each operating indoor unit and the actual indoor temperature, and selecting a maximum value delta TLmax from the difference;
determining an opening increment (delta) Evw of the electronic expansion valve according to the maximum value (delta) TLmax, wherein a target opening of the electronic expansion valve = a current opening + (delta) Evw;
and adjusting the opening degree of the electronic expansion valve to a target opening degree.
7. A multi-split air conditioning system as claimed in claim 6, wherein: determining an opening increment Δ Evw of the electronic expansion valve according to the maximum value Δ TLmax, which specifically includes:
when Δ TLmax is less than or equal to the first setting difference, Δ Evw = a fifth setting opening;
when the first setting difference value (Δ TLmax) is less than or equal to the second setting difference value (Δ Evw = sixth setting opening);
when the second setting difference Δ TLmax is less than or equal to the third setting difference, Δ Evw = a seventh setting opening;
when the third setting difference value (Δ TLmax) is less than or equal to the fourth setting difference value (Δ Evw = eighth setting opening);
when the fourth setting difference value Δ TLmax, Δ Evw = the ninth setting opening;
wherein the first set difference is less than the second set difference is less than the third set difference is less than the fourth set difference;
the fifth set opening degree > the sixth set opening degree > the seventh set opening degree > the eighth set opening degree > the ninth set opening degree.
8. A multi-split air conditioning system as set forth in any one of claims 1 to 7, wherein: a wire controller is arranged in each room, and a switch is arranged at the water inlet of each floor heating; the wire controller controls the operation of the indoor unit and the on-off of the switch.
9. A multi-split air conditioning system as claimed in any one of claims 1 to 7, wherein: the floor heating water module is a shell-and-tube heat exchanger, and a shell of the floor heating water module is provided with a water inlet, a water outlet, a refrigerant inlet and a refrigerant outlet; a water heat exchange channel communicated with the water inlet and the water outlet and a refrigerant heat exchange channel communicated with the refrigerant inlet and the refrigerant outlet are arranged in the shell of the water heater, and the water inlet and the water outlet are connected with the water pipeline; the refrigerant inlet and the refrigerant outlet are connected with the refrigerant pipeline.
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| CN104633869B (en) * | 2015-03-16 | 2017-06-06 | 珠海格力电器股份有限公司 | The control method and system of air-conditioner outdoor unit |
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