CN104457073A - Frequency conversion control method - Google Patents
Frequency conversion control method Download PDFInfo
- Publication number
- CN104457073A CN104457073A CN201410676790.5A CN201410676790A CN104457073A CN 104457073 A CN104457073 A CN 104457073A CN 201410676790 A CN201410676790 A CN 201410676790A CN 104457073 A CN104457073 A CN 104457073A
- Authority
- CN
- China
- Prior art keywords
- frequency
- water pump
- load value
- carried out
- temperature
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/13—Pump speed control
Abstract
The invention discloses a frequency conversion control method. The method includes the following steps that A, the load value is calculated according to the water inlet temperature of a water pump; B, if the load value increases, the working frequency of a heat pump compressor is increased according to the current water inlet temperature, and if the load value decreases, the working frequency of the heat pump compressor is decreased according to the current water inlet temperature and then the frequency of the water pump is decreased. According to the method, heat balance is achieved through the frequency conversion technology during load fluctuation, change situations of heating/refrigerating loads of a current room are judged according to water inlet temperature changes, the compressor and the water pump are controlled for frequency conversion to output proper capacity and water flow rate so that the requirement of current temperature compensation can be met, input of an energy storage water tank is effectively reduced, efficient and safe operation of a unit is guaranteed, and cost and use space are reduced. The frequency conversion control method can be widely applied to the field of heat pumps.
Description
Technical field
The present invention relates to art of heat pumps, especially a kind of method for controlling frequency conversion.
Background technology
Heat pump is in the past generally determines frequency system, when heating in room/when there is fluctuation in cooling load, normally utilize the energy stored in energy-accumulating water tank as temperature-compensating, although this mode can meet room to be heated/cooling load fluctuation hour temperature-compensating, but still there is following problem: 1, when room heat/cooling load fluctuation large time, the energy that energy-accumulating water tank provides cannot meet the requirement of its temperature-compensating, water temperature is greatly affected greatly, in order to the requirement that satisfied temperature compensates, unit frequently will stop machine to compensate energy, thus cause units consumption to increase, 2, increase the heat balance that is used for when realizing load fluctuation of energy-accumulating water tank, not only increase the cost of whole unit, but also taking up space very.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the invention is: thermal balance when a kind of converter technique realizes the fluctuation of load, ensure the control method that unit highly effective and safe runs.
The technical solution adopted in the present invention is: a kind of method for controlling frequency conversion, comprises the following steps:
A, inflow temperature calculated load value according to water pump;
If B load value increases, then correspondingly raising frequency is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then raising frequency is carried out to water pump;
If load value reduces, then correspondingly frequency reducing is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then frequency reducing is carried out to water pump.
Further, in described step B, described load value is cooling load value, if load value increases, then correspondingly carries out raising frequency to the operating frequency of heat pump compressor according to current inflow temperature, then carries out raising frequency to water pump; When inflow temperature exceedes refrigeration maximum temperature set point, control heat pump compressor and remain operating in maximum operating frequency; Then raising frequency is carried out to water pump.
Further, in described step B, described load value is cooling load value, if load value reduces, then correspondingly carries out frequency reducing to the operating frequency of heat pump compressor according to current inflow temperature, then carries out frequency reducing to water pump; When inflow temperature is lower than refrigeration target temperature set point, controls heat pump compressor and remain operating in lowest operating frequency, then frequency reducing is carried out to water pump.
Further, in described step B, when inflow temperature is lower than refrigeration minimum set point temperature, controls heat pump compressor and reduce operating frequency until 0Hz.
Further, in described step B, described load value is heating load value, if load value increases, then correspondingly carries out raising frequency to the operating frequency of heat pump compressor according to current inflow temperature, then carries out raising frequency to water pump; When inflow temperature is lower than when heating minimum set point temperature, control heat pump compressor and remain operating in maximum operating frequency; Then raising frequency is carried out to water pump.
Further, in described step B, described load value is heating load value, if load value reduces, then correspondingly carries out frequency reducing to the operating frequency of heat pump compressor according to current inflow temperature, then carries out frequency reducing to water pump; When inflow temperature is higher than when heating target temperature set point, control heat pump compressor and remain operating in lowest operating frequency, then frequency reducing is carried out to water pump.
Further, in described step B, when inflow temperature is higher than when heating maximum temperature set point, control heat pump compressor and reduce operating frequency until 0Hz.
Further, in described step B, raising frequency is carried out to water pump or frequency reducing comprises following sub-step:
S1, the inflow temperature obtaining water pump and leaving water temperature also calculate the Inlet and outlet water temperature difference;
S2, compare the dutycycle regulating pump working with target temperature difference according to the Inlet and outlet water temperature difference.
Further, described step S2 is specially:
S21, when the Inlet and outlet water temperature difference is less than target temperature difference, control water pump regulate to increase 5% dutycycle;
S22, when the Inlet and outlet water temperature difference equals target temperature difference, control water pump and keep current state work;
S23, when the Inlet and outlet water temperature difference is greater than target temperature difference and is less than 10 DEG C, control water pump regulate to reduce 5% dutycycle;
S24, when the Inlet and outlet water temperature difference is greater than 10 DEG C, control water pump regulate to increase 10% dutycycle.
Further, target temperature difference is for heating target temperature difference or refrigeration target temperature difference.
The invention has the beneficial effects as follows: heat balance when the inventive method realizes load fluctuation by converter technique, the load change situation that current room heats/freezes is judged according to the change of inflow temperature, then control compressor and water pump carry out frequency conversion, to export appropriate ability and discharge to meet current temperature-compensating, thus effectively reduce the input of energy-accumulating water tank, not only ensure that unit highly effective and safe runs, and reduce cost and usage space.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of the inventive method;
Fig. 2 is the frequency conversion parameter schematic diagram in refrigeration situation;
Fig. 3 is the frequency conversion parameter schematic diagram heated in situation.
Wherein: R01: refrigeration target temperature setting value, R10: refrigerated constant temperature shuts down the temperature difference, R12: refrigeration frequency conversion deviation; R02: heat target temperature setting value; R03: deviation is opened in electrical heating; R09: thermostatic heating shuts down the temperature difference; R11: heat frequency conversion deviation.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
With reference to Fig. 1, a kind of method for controlling frequency conversion, comprises the following steps:
A, inflow temperature calculated load value according to water pump;
If B load value increases, then correspondingly raising frequency is carried out to the operating frequency of compressor according to current inflow temperature, to export the demand that larger ability satisfied temperature compensates, then raising frequency is carried out to water pump, the demand compensated with increased water flow amount satisfied temperature;
If load value reduces, then correspondingly frequency reducing is carried out to the operating frequency of compressor according to current inflow temperature, to export the demand that less ability satisfied temperature compensates, then frequency reducing is carried out to water pump, to reduce the demand that discharge satisfied temperature compensates.
With reference to Fig. 2, be further used as preferred embodiment, in described step B, described load value is cooling load value, if inflow temperature uprises, then illustrates that load value increases, then correspondingly raising frequency is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then raising frequency is carried out to water pump; When inflow temperature exceedes refrigeration maximum temperature set point R01+R12, control heat pump compressor and remain operating in maximum operating frequency; Then raising frequency is carried out to water pump.
With reference to Fig. 2, be further used as preferred embodiment, in described step B, described load value is cooling load value, if inflow temperature step-down, if then illustrate, load value reduces, then correspondingly frequency reducing is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then frequency reducing is carried out to water pump; When inflow temperature is lower than refrigeration target temperature set point R01, controls heat pump compressor and be operated in lowest operating frequency, then frequency reducing is carried out to water pump.
With reference to Fig. 2, be further used as preferred embodiment, in described step B, when inflow temperature is lower than refrigeration minimum set point temperature R01-R10, controls heat pump compressor and reduce operating frequency until 0Hz.
With reference to Fig. 3, be further used as preferred embodiment, in described step B, described load value is heating load value, if inflow temperature step-down, then illustrates that load value increases, then correspondingly raising frequency is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then raising frequency is carried out to water pump; When inflow temperature is lower than when heating minimum set point temperature R02-R11, control heat pump compressor and remain operating in maximum operating frequency; Then raising frequency is carried out to water pump.
With reference to Fig. 3, be further used as preferred embodiment, in described step B, described load value is heating load value, if inflow temperature uprises, then illustrates that load value reduces, then correspondingly frequency reducing is carried out to the operating frequency of compressor according to current inflow temperature, then frequency reducing is carried out to water pump; When inflow temperature is higher than when heating target temperature set point R02, control heat pump compressor and remain operating in lowest operating frequency, then frequency reducing is carried out to water pump.
With reference to Fig. 3, be further used as preferred embodiment, in described step B, when inflow temperature is higher than when heating maximum temperature set point R02+R09, control heat pump compressor and reduce operating frequency until 0Hz.
Be further used as preferred embodiment, in described step B, raising frequency carried out to water pump or frequency reducing comprises following sub-step:
S1, the inflow temperature obtaining water pump and leaving water temperature also calculate the Inlet and outlet water temperature difference;
S2, compare the dutycycle regulating pump working with target temperature difference according to the Inlet and outlet water temperature difference.
Be further used as preferred embodiment, described step S2 is specially:
S21, when the Inlet and outlet water temperature difference is less than target temperature difference, control water pump regulate to increase 5% dutycycle;
S22, when the Inlet and outlet water temperature difference equals target temperature difference, control water pump and keep current state work;
S23, when the Inlet and outlet water temperature difference is greater than target temperature difference and is less than 10 DEG C, control water pump regulate to reduce 5% dutycycle;
S24, when the Inlet and outlet water temperature difference is greater than 10 DEG C, control water pump regulate to increase 10% dutycycle.
Be further used as preferred embodiment, target temperature difference is for heating target temperature difference or refrigeration target temperature difference.
In a heating mode, as follows to the control method of pump variable frequency:
(1), 0 DEG C≤| T01-T02| < P05, water pump regulates to increase 5% dutycycle;
(2), | T01-T02|=P05, water pump keeps present speed not regulate;
(3), P05 < | T01-T02|≤10 DEG C, water pump regulates to reduce 5% dutycycle;
(4), | T01-T02| > 10 DEG C, water pump regulates to reduce 10% dutycycle;
Wherein: T01 is inflow temperature; T02 is leaving water temperature; P05 is for heating target temperature difference.
In cooling mode, as follows to the control method of pump variable frequency:
(1), 0 DEG C≤| T01-T02| < P06, water pump regulates to increase 5% dutycycle;
(2), | T01-T02|=P06, water pump keeps present speed not regulate;
(3), P06 < | T01-T02|≤10 DEG C, water pump regulates to reduce 5% dutycycle;
(4), | T01-T02| > 10 DEG C, water pump regulates to reduce 10% dutycycle.
Wherein: T01 is inflow temperature; T02 is leaving water temperature; P06 is refrigeration target temperature difference.
Hot/cold target temperature difference processed is within 10 DEG C under normal circumstances, ensures temperature controlled accuracy with less target temperature difference.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art can also make all equivalents or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (10)
1. a method for controlling frequency conversion, is characterized in that: comprise the following steps:
A, inflow temperature calculated load value according to water pump;
If B load value increases, then correspondingly raising frequency is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then raising frequency is carried out to water pump;
If load value reduces, then correspondingly frequency reducing is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then frequency reducing is carried out to water pump.
2. a kind of method for controlling frequency conversion according to claim 1, it is characterized in that: in described step B, described load value is cooling load value, if load value increases, then correspondingly raising frequency is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then raising frequency is carried out to water pump; When inflow temperature exceedes refrigeration maximum temperature set point, control heat pump compressor and remain operating in maximum operating frequency; Then raising frequency is carried out to water pump.
3. a kind of method for controlling frequency conversion according to claim 1, it is characterized in that: in described step B, described load value is cooling load value, if load value reduces, then correspondingly frequency reducing is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then frequency reducing is carried out to water pump; When inflow temperature is lower than refrigeration target temperature set point, controls heat pump compressor and remain operating in lowest operating frequency, then frequency reducing is carried out to water pump.
4. a kind of method for controlling frequency conversion according to claim 3, is characterized in that: in described step B, when inflow temperature is lower than refrigeration minimum set point temperature, controls heat pump compressor and reduces operating frequency until 0Hz.
5. a kind of method for controlling frequency conversion according to claim 1, it is characterized in that: in described step B, described load value is heating load value, if load value increases, then correspondingly raising frequency is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then raising frequency is carried out to water pump; Inflow temperature, lower than when heating minimum set point temperature, controls heat pump compressor and remains operating in maximum operating frequency; Then raising frequency is carried out to water pump.
6. a kind of method for controlling frequency conversion according to claim 1, it is characterized in that: in described step B, described load value is heating load value, if load value reduces, then correspondingly frequency reducing is carried out to the operating frequency of heat pump compressor according to current inflow temperature, then frequency reducing is carried out to water pump; When inflow temperature is higher than when heating target temperature set point, control heat pump compressor and remain operating in lowest operating frequency, then frequency reducing is carried out to water pump.
7. a kind of method for controlling frequency conversion according to claim 6, is characterized in that: in described step B, when inflow temperature is higher than when heating maximum temperature set point, controls heat pump compressor and reduces operating frequency until 0Hz.
8. a kind of method for controlling frequency conversion according to claim arbitrary in claim 1-7, is characterized in that: carry out raising frequency to water pump in described step B or frequency reducing comprises following sub-step:
S1, the inflow temperature obtaining water pump and leaving water temperature also calculate the Inlet and outlet water temperature difference;
S2, compare the dutycycle regulating pump working with target temperature difference according to the Inlet and outlet water temperature difference.
9. a kind of method for controlling frequency conversion according to claim 8, is characterized in that: described step S2 is specially:
S21, when the Inlet and outlet water temperature difference is less than target temperature difference, control water pump regulate to increase 5% dutycycle;
S22, when the Inlet and outlet water temperature difference equals target temperature difference, control water pump and keep current state work;
S23, when the Inlet and outlet water temperature difference is greater than target temperature difference and is less than 10 DEG C, control water pump regulate to reduce 5% dutycycle;
S24, when the Inlet and outlet water temperature difference is greater than 10 DEG C, control water pump regulate to increase 10% dutycycle.
10. a kind of method for controlling frequency conversion according to claim 8, is characterized in that: target temperature difference is for heating target temperature difference or refrigeration target temperature difference.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410676790.5A CN104457073B (en) | 2014-11-21 | 2014-11-21 | Frequency conversion control method |
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| CN201410676790.5A CN104457073B (en) | 2014-11-21 | 2014-11-21 | Frequency conversion control method |
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| CN104457073A true CN104457073A (en) | 2015-03-25 |
| CN104457073B CN104457073B (en) | 2017-02-22 |
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| CN201410676790.5A Active CN104457073B (en) | 2014-11-21 | 2014-11-21 | Frequency conversion control method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833066A (en) * | 2015-04-23 | 2015-08-12 | 广东芬尼克兹节能设备有限公司 | Mode switching method for variable frequency heat pump |
| CN105318460A (en) * | 2015-10-15 | 2016-02-10 | 珠海格力电器股份有限公司 | Control system, control method and water chilling unit using control system and control method |
| CN106931661A (en) * | 2017-03-27 | 2017-07-07 | 青岛海尔智能技术研发有限公司 | Water heater energy-saving control method and energy-saving water heater |
| CN106970661A (en) * | 2016-01-13 | 2017-07-21 | 浙江理工大学 | The high accuracy temperature control method of great Rong water tanks |
| CN107300231A (en) * | 2017-07-20 | 2017-10-27 | 广东美的暖通设备有限公司 | Source pump and its control method and device |
| CN108224702A (en) * | 2017-12-18 | 2018-06-29 | 青岛海尔空调电子有限公司 | For the control method and device of central air conditioner system |
| CN108551423A (en) * | 2018-04-11 | 2018-09-18 | 浙江工业大学 | The special multichannel intelligent gateway of industry measurement pump group cluster remote monitoring |
| CN109059376A (en) * | 2018-08-13 | 2018-12-21 | 珠海格力电器股份有限公司 | A kind of full frequency conversion heat pump system constant temperature water supply control method and system |
| CN109073242A (en) * | 2015-11-20 | 2018-12-21 | Sens地质能源储存公司 | Heat pump system and method for controlling heat pump system |
| CN109556331A (en) * | 2018-12-12 | 2019-04-02 | 珠海格力电器股份有限公司 | A kind of water chiller and its temperature control method of water |
| CN109611989A (en) * | 2018-12-12 | 2019-04-12 | 广东智科电子股份有限公司 | A kind of temperature of water chiller/heater and press Frequency Synchronization regulating device and method |
| CN110779232A (en) * | 2019-10-14 | 2020-02-11 | 珠海格力电器股份有限公司 | Control method and device for multi-connected cold and hot water unit and multi-connected cold and hot water unit |
| CN111707031A (en) * | 2020-05-25 | 2020-09-25 | 广东纽恩泰新能源科技发展有限公司 | Heat pump unit starting control method and system |
| CN111972991A (en) * | 2019-05-23 | 2020-11-24 | 佛山市顺德区美的电热电器制造有限公司 | Hot water treatment device and control method and device thereof |
| CN113606782A (en) * | 2021-07-30 | 2021-11-05 | 宁波奥克斯电气股份有限公司 | Variable frequency control method and device of heat pump unit, storage medium and heat pump unit |
| WO2023071330A1 (en) * | 2021-10-26 | 2023-05-04 | 珠海格力电器股份有限公司 | Method and apparatus for regulating and controlling outlet water temperature of heat pump system, and heat pump system |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833066B (en) * | 2015-04-23 | 2017-11-14 | 广东芬尼克兹节能设备有限公司 | A kind of mode switching method of frequency conversion heat pump |
| CN104833066A (en) * | 2015-04-23 | 2015-08-12 | 广东芬尼克兹节能设备有限公司 | Mode switching method for variable frequency heat pump |
| CN105318460A (en) * | 2015-10-15 | 2016-02-10 | 珠海格力电器股份有限公司 | Control system, control method and water chilling unit using control system and control method |
| CN105318460B (en) * | 2015-10-15 | 2018-01-23 | 珠海格力电器股份有限公司 | Control system, control method and apply its handpiece Water Chilling Units |
| CN109073242A (en) * | 2015-11-20 | 2018-12-21 | Sens地质能源储存公司 | Heat pump system and method for controlling heat pump system |
| CN106970661A (en) * | 2016-01-13 | 2017-07-21 | 浙江理工大学 | The high accuracy temperature control method of great Rong water tanks |
| CN106970661B (en) * | 2016-01-13 | 2019-11-29 | 浙江理工大学 | The high accuracy temperature control method of water tank |
| CN106931661B (en) * | 2017-03-27 | 2020-12-15 | 青岛海尔智能技术研发有限公司 | Energy-saving control method for water heater and energy-saving water heater |
| CN106931661A (en) * | 2017-03-27 | 2017-07-07 | 青岛海尔智能技术研发有限公司 | Water heater energy-saving control method and energy-saving water heater |
| CN107300231A (en) * | 2017-07-20 | 2017-10-27 | 广东美的暖通设备有限公司 | Source pump and its control method and device |
| CN107300231B (en) * | 2017-07-20 | 2019-12-27 | 广东美的暖通设备有限公司 | Heat pump unit and control method and device thereof |
| CN108224702A (en) * | 2017-12-18 | 2018-06-29 | 青岛海尔空调电子有限公司 | For the control method and device of central air conditioner system |
| CN108224702B (en) * | 2017-12-18 | 2020-08-18 | 青岛海尔空调电子有限公司 | Control method and device for central air-conditioning system |
| CN108551423A (en) * | 2018-04-11 | 2018-09-18 | 浙江工业大学 | The special multichannel intelligent gateway of industry measurement pump group cluster remote monitoring |
| CN109059376A (en) * | 2018-08-13 | 2018-12-21 | 珠海格力电器股份有限公司 | A kind of full frequency conversion heat pump system constant temperature water supply control method and system |
| CN109611989A (en) * | 2018-12-12 | 2019-04-12 | 广东智科电子股份有限公司 | A kind of temperature of water chiller/heater and press Frequency Synchronization regulating device and method |
| CN109556331A (en) * | 2018-12-12 | 2019-04-02 | 珠海格力电器股份有限公司 | A kind of water chiller and its temperature control method of water |
| CN109611989B (en) * | 2018-12-12 | 2021-02-05 | 广东智科电子股份有限公司 | Device and method for synchronously adjusting temperature of cold and hot water machine and frequency of press |
| CN111972991A (en) * | 2019-05-23 | 2020-11-24 | 佛山市顺德区美的电热电器制造有限公司 | Hot water treatment device and control method and device thereof |
| CN110779232A (en) * | 2019-10-14 | 2020-02-11 | 珠海格力电器股份有限公司 | Control method and device for multi-connected cold and hot water unit and multi-connected cold and hot water unit |
| CN111707031A (en) * | 2020-05-25 | 2020-09-25 | 广东纽恩泰新能源科技发展有限公司 | Heat pump unit starting control method and system |
| CN111707031B (en) * | 2020-05-25 | 2021-06-11 | 广东纽恩泰新能源科技发展有限公司 | Heat pump unit starting control method and system |
| CN113606782A (en) * | 2021-07-30 | 2021-11-05 | 宁波奥克斯电气股份有限公司 | Variable frequency control method and device of heat pump unit, storage medium and heat pump unit |
| WO2023071330A1 (en) * | 2021-10-26 | 2023-05-04 | 珠海格力电器股份有限公司 | Method and apparatus for regulating and controlling outlet water temperature of heat pump system, and heat pump system |
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|---|---|
| CN104457073B (en) | 2017-02-22 |
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