CN1746649A - Cold-amount distribution metering method and device for central air conditioner - Google Patents
Cold-amount distribution metering method and device for central air conditioner Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 claims abstract description 15
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- 238000004891 communication Methods 0.000 claims description 30
- 238000005057 refrigeration Methods 0.000 claims description 14
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- 238000001514 detection method Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 3
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
A method for metering distribution of cooling amount generated by central air-conditioning includes calculating out cooling coefficients of KjH, Kjm and KjL according to wind speed of air-conditioning coil and calculating out cold water valve opening periods of t H, t M and t L corresponding to three different wind speed of said coil, utilizing formula of E i=t H .K j H + t m .K j M + t L .K j L to calculate out cooling amount coefficient Ei for realizing a reasonable charge manner.
Description
Technical field
The present invention relates to a kind of charging way of central air conditioner, is a kind of central air conditioner cold-amount distribution metering method and device thereof specifically.
Technical background
At present, building energy consumption has become the main reason that energy resource consumption increases.The energy consumption of central air conditioner accounts for 50～60% of whole building energy consumption.Wherein, the air-conditioning equipment energy consumption is greatly an aspect, and it is another main cause that irrational charge method causes the artificial waste in the use.
At present, Chang Yong air conditioning charging way has two big classes.
First kind, adopt the freezing water yield and the supply backwater temperature difference flow through metering central air conditioner end, though and to carry out the cooling metering mode of integrating more accurate.But it is higher also to exist equipment manufacturing cost, and the difficulty of the old building transforming project implementation is bigger, and construction wrong can influence problems such as metering and result of use.
Second kind, the fan coil that calculates the central air conditioner end divides the way of air-conditioning expense working time.But this way is just measured and is detected the working time and the wind speed of fan coil.Can't implement effectively to detect and calculate for following several situations, may occur that user's reality is not used central air conditioner and situation that the metering outfit mistake is calculated takes place.
1. the electronic cold valves of the fan coil of central air conditioner end is because other reasons can not effectively be closed, and the result reduces integrating cold coefficient.
2. the central air conditioner refrigeration host computer does not move, but the fan coil operation, and the result increases integrating cold coefficient.
3. the cold valves of the fan coil region of central air conditioner end is closed, but the fan coil operation, and the result increases integrating cold coefficient.
Summary of the invention
The present invention has overcome above-mentioned shortcoming, and a kind of simplicity of design, the rational central air conditioner cold-amount distribution metering method of metering and device thereof are provided.
The present invention solves the technical scheme that its technical matters takes: a kind of central air conditioner cold-amount distribution metering method may further comprise the steps:
(1) according to the wind speed state computation coefficient of refrigerating performance K of air-conditioning coil pipe
JH, K
JM, K
JL: calculate three kinds of refrigeration of coil pipe low-medium-high level parameter respectively with same model under the ratio of middle-grade refrigeration parameter;
(2) the opening time t of detection cold valves correspondence under three kinds of different wind speed of coil pipe
H, t
M, t
L
(3) calculate coil pipe cold coefficient E according to following formula
i:
E
i＝t
H·K
jH+t
M·K
jM+t
L·K
jL
Described step (3) is calculated coil pipe cold coefficient E
iAlso comprise temperature interlocking metering algorithm, by the wind pushing temperature of temperature in the sensing chamber and fan coil, C.T. is in refrigerating state following time, just begins to calculate described cold coefficient E before
i
Described step (3) is calculated coil pipe cold coefficient E
iAlso comprise state interlocking algorithm before, when the refrigeration host computer of central air-conditioning system brings into operation, and cold water is transported to after each zone (floor) is in the cold valves of opening, just begin the cold coefficient of integrating fan coil by chilled water pump.
A kind of central air conditioner cold distribution and computation table that adopts said method, comprise control module and output module, described control module is arranged on the indoor wall of being convenient to operate, be used for described output module is controlled, and the cold of air-conditioning carried out integrating, described output module is arranged near on the floor or wall of fan coil installation site, is used to carry out the control signal that described control module is sent.
Can comprise microprocessor and the power circuit, telecommunication circuit, display circuit, temperature sensor and the supervisory keyboard that link to each other with described microprocessor respectively in the described control module, comprise another microprocessor and the power circuit that links to each other with described microprocessor, temperature sensor, telecommunication circuit and driving executive circuit in the described output module, the telecommunication circuit by separately between described control module and the output module is connected and communicates.
Telecommunication circuit in the described control module can comprise M-BUS telecommunication circuit and analogue communication circuit, is respectively applied for upper management system and output module to communicate, and also claims the analogue communication circuit corresponding to the telecommunication circuit in the described output module.
Analog communication circuit in the described control module is used for realizing communicating by letter with output module, can comprise two optocouplers, a triode, a light emitting diode and peripheral a plurality of resistance thereof, 2 pin of wherein said first optocoupler connect the emitter of described triode after through a resistance, the grounded collector of described triode, 19 pin that base stage connects described microprocessor link to each other, 4 pin of described another optocoupler are connected with 1 pin of first optocoupler, 5 pin connect 20 pin of described microprocessor, and simultaneously through pull-up resistor connection+3.3V power supply, anodal connection+3.3V the power supply of described light emitting diode, negative pole links to each other with the emitter of described triode behind a resistance.
Analogue communication circuit in the described output module can mainly comprise two optocouplers, a triode and a reverser, 15 pin of microprocessor are through being connected to the base stage of described triode in the described output module behind the described reverser, the grounded emitter of described triode, collector connects 2 pin of described first optocoupler after through a resistance, 4 pin of described first optocoupler directly link to each other with 1 pin of second optocoupler, the 2 pin process fuse of second optocoupler links to each other with the analog communication module in the described control module, carries out exchanges data with described control module.
The present invention is according to the wind speed state computation coefficient of refrigerating performance K of air-conditioning coil pipe
JH, K
JM, K
JL, and the opening time t of cold valves correspondence under three kinds of different wind speed of coil pipe
H, t
M, t
L, pass through E
i=t
HK
IH+ t
MK
IM+ t
LK
JLCalculate coil pipe cold coefficient E
iThereby, realize reasonably charging of a kind of realization, can impel the central air conditioner user to form energy-conservation custom, improve rate of energy.Simultaneously unique detection pattern among the present invention and novel structure that central air conditioner cold billing function and radiator valve are united two into one greatly reduce cooling metering and temperature controlled cost, have reduced the expense of estate management, have improved the level of managing.
Description of drawings
Fig. 1 is the block diagram of control circuit among the present invention
Fig. 2 is a structural representation of the present invention
Fig. 3 is the partial circuit schematic diagram of control module among the present invention
Fig. 4 is communications portion circuit theory diagrams in the control module among the present invention
The circuit theory diagrams of output module among Fig. 5 the present invention
Table 6 is the refrigeration parameter list of the wind speed correspondence of fan coil in the embodiment of the invention
Table 7 is the coefficient of refrigerating performance table of the wind speed correspondence of fan coil in the embodiment of the invention
Embodiment
As shown in Figure 1, invention mainly comprises control module 101 and output module 102, comprise microprocessor 103 and the power circuit 104 that links to each other with described microprocessor 103 respectively in the described control module 101, display circuit 105, M-BUS telecommunication circuit 106, supervisory keyboard 107, temperature sensor 108 and analogue communication circuit 109, comprise another microprocessor 110 and the power circuit 113 that links to each other with described microprocessor 110 in the described output module 102, temperature sensor 112, analogue communication circuit 111 and drive executive circuit 114, the analogue communication circuit 109 by separately between described control module 101 and the output module 102 is connected with 111 and communicates.
As shown in Figure 2, described control module 201 (being 101 among Fig. 1) is inlaid on the indoor wall of being convenient to operate, the temperature sensor 205 that detects indoor temperature is installed in the inside of control panel, described output module 202 is installed near the indoor floor of fan coil installation site or near on the wall of floor, temperature sensor 206 in the described output module is arranged in the fan coil, described display circuit is the LCD display circuit, and its LCD display is arranged on the panel of described control module 201.The motorized valve 204 that is used to control cold water pipe is arranged on the chilled water pipe of described blower fan 203, and the opening and closing by described output module control motorized valve 204.Described control module 201 and output module 202 are connected by lead, and described output module 202 also connects and control the wind speed of described blower fan 203 by lead.
The circuit theory diagrams of described control module are as shown in Fig. 3,4, described microprocessor U1 is a single-chip microcomputer, be used for the The whole control module is carried out overall operation control, comprise display message, parameter is set and controls described output module etc., and have the M-BUS interface of external connected network communication and the software control of communication interface that output module is controlled.
Described power circuit is regulator block U5 and U6 and peripheral circuit formation thereof, by regulator block U5 output+5V voltage stabilizing, by regulator block U6 output+3.3V voltage stabilizing, thereby can export+5V and+two level stable voltage of 3.3V, provide working dc power for containing microprocessor and peripheral circuit thereof, communicating circuit, temperature sensor, LCD display circuit, storer etc.
A power sense circuit, form by resistance R 14, R15, R16, R38, capacitor C 2, diode D3 and operational amplifier U4, wherein operational amplifier U4 is LM393, input end is through resistance R 38 connection+3.3V power supplys in the same way, be connected to the reverse input end of described amplifier U4 after resistance R 14, the R15 general+12V dividing potential drop, connect the control end of microcontroller U1 behind the diode D3 of output terminal through oppositely connecting.
By KEY1, KEY2, KEY3, KEY4, KEY5, the keyboard matrix circuit that KEY6 forms, connect one group of control end of microprocessor U1 respectively, be responsible for being provided with relevant parameter, and LCD display circuit demonstration output menu and related data by constituting by chip for driving U2 and display screen, wherein lcd driver U2 is HT1621B, X1 is a crystal, meet the pin XIN of microcontroller U1, XOUT, for microprocessor provides clock signal, a storer U3 is the data terminal of 24C02 and described microprocessor U1, be used for storing system information and continuous data, temperature sensor U12 is DS18B20, is used to realize the measurement of indoor temperature, the pin 3 of temperature sensor U12 connects+3.3V, pin 2 connects U1 pin 9, and pin 2 connects+the 3.3V direct supply pin 1 ground connection in addition through resistance R 3.The pin 15,16 of described microprocessor U1 is the communication interface serial port, connects described M-BUS telecommunication circuit, and realization is communicated by letter with last level controlling system or zone manager or Ethernet, thereby realizes wider Total tune control.Because described M-BUS telecommunication circuit is routine techniques comparatively, and is not the emphasis that the present invention will illustrate, so in the drawings the schematic diagram of this part circuit is omitted.Described microcontroller U1 pin 19,20 is the analog communication interface, links to each other with described analogue communication circuit, realizes communicating by letter with output module.Reset circuit is made up of diode D4, capacitor C 9, resistance R 11, and the positive pole of described diode D4 and capacitor C 9, resistance R 11 have common ports and connect the resetting pin of microprocessor U1, realize the electrification reset of microprocessor.
Described analog communication circuit is used for realizing communicating by letter with output module, by two optocoupler U10, triode Q2 of U11, LED 3 and peripheral a plurality of resistance thereof are formed, 2 pin of wherein said optocoupler U10 connect the emitter of described triode Q2 through resistance R 28 backs, the grounded collector of described triode Q2,19 pin that base stage connects described microprocessor U1 link to each other, 4 pin of described optocoupler U10 are connected with 1 pin of U11,5 pin connect 20 pin of described microprocessor U1, and simultaneously through pull-up resistor R13 connection+3.3V power supply, described LED 3 anodal connection+3.3V power supplys, negative pole links to each other with the emitter of described triode Q2 after resistance R 29.
Described output module comprises microprocessor U7 and peripheral auxiliary circuits thereof, communication interface circuit, drives executive circuit, power circuit and temperature sensor as shown in Figure 5.
Power circuit is transformer T1, rectifier bridge B1, voltage stabilizer U7 and U8 and peripheral circuit thereof, provide working dc power for containing microprocessor and peripheral circuit thereof, communication interface circuit, control circuit and control panel, described transformer T1 is depressured to AC15V with AC220V, be converted to direct current by described rectifier bridge B1, constituting+the 12V mu balanced circuit via capacitor C 7, C11, regulator block U13 and capacitor C 12, C8, forming+the 3.3V mu balanced circuit by C13, C9 and U14.
Microprocessor U7 is a single-chip microcomputer also, is used to control the overall work of whole output module.X2 is a crystal, connect the pin 5,6 of described microprocessor U7, for microprocessor provides clock signal, described microprocessor U7 pin 14,15 is the analog communication interface, link to each other with described analogue communication circuit, realize communicating with control module, the pin 7 of described microprocessor U7 is connected with reset circuit, realize the electrification reset of microprocessor
Described driving executive circuit comprises one group of phase inverter U8A～U8E, Darlington driver U15, relay R ELAY1～RELAY5, resistance R 1～R5 and capacitor C 1～C5, described reverser is 74HC04, the control output end of the input end of every reverser and described microprocessor U7, the output terminal of every reverser all connects the input end of an end Darlington driver U15 respectively, the output terminal of described Darlington driver U15 connects the coil of relay R ELAY1～RELAY5 respectively, the normally opened contact of relay R ELAY1～RELAY5 then connects corresponding motorized valve, thereby control the switch and the coil pipe blower fan height of described electric two-way valve, in, the switching of low third gear wind speed, wherein RELAY1～RELAY3 is JZC-36F, realization fan unit height, in, the switching of low third gear wind speed, RELAY4～RELAY5 is JZC-32F, the switch control that realizes refrigeration or heat.
Described analogue communication circuit mainly comprises optocoupler U16, U17, triode Q1 and reverser U8F, 15 pin of described microprocessor U7 are through being connected to the base stage of described triode Q1 behind the described reverser U8F, the grounded emitter of described triode Q1, collector connects 2 pin of described optocoupler U16 through a resistance R 11 backs, 4 pin of described optocoupler U16 directly link to each other with 1 pin of optocoupler U17, the 2 pin process fuse of U17 links to each other with the analog communication module in the described control module, carries out exchanges data with described control module.
Based on said structure, the cold distribution and computation of described air-conditioning can obtain by following process integrating: the integrating of cold equivalent, be to detect the time span that electronic cold valves is opened, thereby detect the time (producing the time of refrigeration) that fan coil uses chilled water by output module.Simultaneously, the blower fan that detects fan coil by output module is among the time span that electronic cold valves is opened, and high, medium and low three speed take the length of working time respectively.
(1) table 6 is corresponding refrigeration parameter lists of different size disc manage-style speed of certain brand fan coil.According to table 5, the coil pipe that adopts the FP-10 specification is at the cold value of middle-grade wind speed benchmark as a comparison.Thereby calculate the coefficient of refrigerating performance of coil pipe under three kinds of wind friction velocities of other specifications.For example, under above-mentioned rule the FP-10 coil pipe at middle-grade coefficient of refrigerating performance=4800/4800=1.000, and at the coefficient of refrigerating performance=5300/4800=1.104 of top grade, low-grade coefficient of refrigerating performance=4100/4800=0.854.The coil pipe of other specifications by that analogy.The fan coil of the different size that table 7 calculates according to said method corresponding coefficient of refrigerating performance table under three kinds of wind speed states, i.e. K under the corresponding specification
JH, K
JM, K
JLValue.
(2) opening time of detection cold valves correspondence under three kinds of different wind speed of coil pipe, i.e. the opening time of the electric two-way valve of the high, medium and low third gear wind speed switching of coil pipe blower fan, be t
H, t
M, t
L
(3) must consider the influence of the operation of fan coil in actual applications, therefore, must avoid because system equipment causes the mistake metering to indoor central air conditioner consumption to the indoor air temperature variation.Therefore introduced the chain metering algorithm of temperature: be between 23～27 ℃ and change when control panel detects indoor temperature (summer), after the wind pushing temperature that output module detects fan coil is in and changes between 15～20 ℃.In other words, after central air-conditioning system was in normal cooling state, the central air conditioner cold distributed the constant temperature table just to begin the cold coefficient of integrating fan coil.
(4) refrigeration host computer running status and the chain algorithm of regional Cold water tap opening (Fig. 2,3).When the refrigeration host computer of central air-conditioning system brings into operation, and cold water is transported to after each zone (floor) is in the cold valves of opening by chilled water pump, be in charge of the zone manager of refrigeration host computer and regional cold valves state detection module, by being in charge of the broadcast related running state information of zone manager of central air conditioner cold allocation table.By the communication interface on the control module, receive that the control module of above-mentioned information just begins the cold coefficient of integrating fan coil.
(5) like this, the coefficient of refrigerating performance of the fan coil of different size under different wind speed states just produced.Therefore, the cold equivalent of fan coil just can calculate according to following formula:
E
i＝t
H·K
jH+t
M·K
jM+t
L·K
jL
In the formula:
E
i-Di i the cold coefficient that table consumes;
t
H-fan coil is at the time of high-grade wind speed operation, s;
t
M-fan coil is at the time of middle-grade wind speed operation, s;
t
H-fan coil is at the time of low-grade wind speed operation, s;
K
JH-j type fan coil is at the theoretical coefficient of refrigerating performance of high-grade wind speed;
K
JM-j type fan coil is at the theoretical coefficient of refrigerating performance of middle-grade wind speed;
K
JL-j type fan coil is at the theoretical coefficient of refrigerating performance of low-grade wind speed;
Control module is according to current coil pipe fan operation state, and the motorized valve on off state effectively charges, and is stored in the storer, by M-BUS communication interface and zone manager communication, is transferred in the computer management system, carries out accounting management.Described control module receives the host computer instruction by communication interface and realizes management of time type charging temperature controller and control.
In addition, can also carry out thermostatic control to indoor temperature, be by the temperature in the control module sensing chamber and with the predefined desired temperature in inside relatively after, send corresponding order, the electronic cold valves relay of control output module, the action that realization opens or closes, thus realize indoor thermostatic control.When the wind speed control of setting fan coil, during for " manually " state, carry out the manual shift of wind speed by the user; During for " automatically " state, control panel sends control commands corresponding by comparing the gap of indoor temperature value and preset temperature value, and the wind speed pilot relay in the control output module makes fan operation at corresponding wind speed gear.
Like this,, realize reasonably chargeing, can impel the central air conditioner user to form energy-conservation custom, improve rate of energy by the reasonable metering that the cold among the present invention distributes.Simultaneously unique detection pattern among the present invention and novel structure that central air conditioner cold billing function and radiator valve are united two into one greatly reduce cooling metering and temperature controlled cost, have reduced the expense of estate management, have improved the level of managing.
More than central air conditioner cold-amount distribution metering method provided by the present invention and device thereof are 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.
Table 6
Table 7
Claims (8)
1. central air conditioner cold-amount distribution metering method is characterized in that: may further comprise the steps:
(1) according to the wind speed state computation coefficient of refrigerating performance K of air-conditioning coil pipe
JH, K
JH, K
JL: calculate three kinds of refrigeration of coil pipe low-medium-high level parameter respectively with same model under the ratio of middle-grade refrigeration parameter;
(2) the opening time t of detection cold valves correspondence under three kinds of different wind speed of coil pipe
H, t
M, t
L
(3) calculate coil pipe cold coefficient E according to following formula
i:
E
i＝t
H·K
jH+t
M·K
jM?+t
L·K
jL
2. central air conditioner cold-amount distribution metering method according to claim 1 is characterized in that: described step (3) is calculated coil pipe cold coefficient E
iAlso comprise temperature interlocking metering algorithm, by the wind pushing temperature of temperature in the sensing chamber and fan coil, C.T. is in refrigerating state following time, just begins to calculate described cold coefficient E before
i
3. central air conditioner cold-amount distribution metering method according to claim 1 and 2 is characterized in that: described step (3) is calculated coil pipe cold coefficient E
iAlso comprise state interlocking algorithm before, when the refrigeration host computer of central air-conditioning system brings into operation, and cold water is transported to after each zone (floor) is in the cold valves of opening, just begin the cold coefficient of integrating fan coil by chilled water pump.
4. central air conditioner cold distribution and computation table that adopts said method, it is characterized in that: comprise control module and output module, described control module is arranged on the indoor wall of being convenient to operate, be used for described output module is controlled, and the cold of air-conditioning carried out integrating, described output module is arranged near on the floor or wall of fan coil installation site, is used to carry out the control signal that described control module is sent.
5. central air conditioner cold distribution and computation table according to claim 4, it is characterized in that: comprise microprocessor and the power circuit, telecommunication circuit, display circuit, temperature sensor and the supervisory keyboard that link to each other with described microprocessor respectively in the described control module, comprise another microprocessor and the power circuit that links to each other with described microprocessor, temperature sensor, telecommunication circuit and driving executive circuit in the described output module, the telecommunication circuit by separately between described control module and the output module is connected and communicates.
6. central air conditioner cold distribution and computation table according to claim 5, it is characterized in that: the telecommunication circuit in the described control module comprises M-BUS telecommunication circuit and analogue communication circuit, be respectively applied for upper management system and output module and communicate, also claim the analogue communication circuit corresponding to the telecommunication circuit in the described output module.
7. according to claim 5 or 6 described central air conditioner cold distribution and computation tables, it is characterized in that: the analog communication circuit in the described control module is used for realizing communicating by letter with output module, comprise two optocouplers, a triode, a light emitting diode and peripheral a plurality of resistance thereof, 2 pin of wherein said first optocoupler connect the emitter of described triode after through a resistance, the grounded collector of described triode, 19 pin that base stage connects described microprocessor link to each other, 4 pin of described another optocoupler are connected with 1 pin of first optocoupler, 5 pin connect 20 pin of described microprocessor, and simultaneously through pull-up resistor connection+3.3V power supply, anodal connection+3.3V the power supply of described light emitting diode, negative pole links to each other with the emitter of described triode behind a resistance.
8. according to claim 5 or 6 described central air conditioner cold distribution and computation tables, it is characterized in that: the analogue communication circuit in the described output module mainly comprises two optocouplers, a triode and a reverser, 15 pin of microprocessor are through being connected to the base stage of described triode in the described output module behind the described reverser, the grounded emitter of described triode, collector connects 2 pin of described first optocoupler after through a resistance, 4 pin of described first optocoupler directly link to each other with 1 pin of second optocoupler, the 2 pin process fuse of second optocoupler links to each other with the analog communication module in the described control module, carries out exchanges data with described control module.
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| CN101916463A (en) * | 2010-07-28 | 2010-12-15 | 北京海林节能设备股份有限公司 | Timing device and charging system for heating and ventilating air conditioner |
| CN102968149A (en) * | 2012-12-10 | 2013-03-13 | 广东中烟工业有限责任公司 | Novel temperature and humidity control method and system |
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- 2005-10-25 CN CNB2005101145704A patent/CN100504338C/en active Active
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| CN101916463A (en) * | 2010-07-28 | 2010-12-15 | 北京海林节能设备股份有限公司 | Timing device and charging system for heating and ventilating air conditioner |
| CN101916463B (en) * | 2010-07-28 | 2012-06-27 | 北京海林节能设备股份有限公司 | Timing device and charging system for heating and ventilating air conditioner |
| CN102968149A (en) * | 2012-12-10 | 2013-03-13 | 广东中烟工业有限责任公司 | Novel temperature and humidity control method and system |
| CN105547332A (en) * | 2016-01-27 | 2016-05-04 | 深圳市天创达科技有限公司 | VRV air-condition billing system |
| CN105547332B (en) * | 2016-01-27 | 2017-11-21 | 深圳市天创达科技有限公司 | VRV air conditioning charging systems |
| CN108915297A (en) * | 2018-07-07 | 2018-11-30 | 长沙修恒信息科技有限公司 | A kind of landscape type energy conservation resident systems |
| CN108952234A (en) * | 2018-07-07 | 2018-12-07 | 湖南环境生物职业技术学院 | A kind of green ecological guest room |
| CN108952234B (en) * | 2018-07-07 | 2021-03-05 | 湖南环境生物职业技术学院 | Green ecological guest room |
| CN108915297B (en) * | 2018-07-07 | 2021-06-04 | 江西省荣阳建设工程有限公司 | Landscape type energy-saving living system |
| CN109389759A (en) * | 2018-12-26 | 2019-02-26 | 广州柏诚智能科技有限公司 | VRV central air conditioner system charge system and its charging method |
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| CN100504338C (en) | 2009-06-24 |
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