US20180106483A1 - Method and system for controlling frequency of variable-frequency compressor in heat pump water heater - Google Patents
Method and system for controlling frequency of variable-frequency compressor in heat pump water heater Download PDFInfo
- Publication number
- US20180106483A1 US20180106483A1 US15/501,122 US201515501122A US2018106483A1 US 20180106483 A1 US20180106483 A1 US 20180106483A1 US 201515501122 A US201515501122 A US 201515501122A US 2018106483 A1 US2018106483 A1 US 2018106483A1
- Authority
- US
- United States
- Prior art keywords
- frequency
- temperature
- water
- preset
- working frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 247
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012937 correction Methods 0.000 claims description 49
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 12
- 239000003507 refrigerant Substances 0.000 claims description 7
- 230000015654 memory Effects 0.000 description 10
- 230000006870 function Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/375—Control of heat pumps
- F24H15/38—Control of compressors of heat pumps
-
- 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
- F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
- F24D19/1054—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water the system uses a heat pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/10—Control of fluid heaters characterised by the purpose of the control
- F24H15/174—Supplying heated water with desired temperature or desired range of temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/219—Temperature of the water after heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/258—Outdoor temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
- F24H4/04—Storage heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
- F24H9/2021—Storage heaters
-
- 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
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
- F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
Definitions
- the present disclosure relates to heat pump water heater technology, and more particularly relates to a method and a system for controlling frequency of a variable-frequency compressor in a heat pump water heater.
- variable-frequency heat pump water heater In recent years, as an effective energy-saving and environment-friendly equipment, the heat pump water heater has been used increasingly around the world. With the development of variable-frequency technology, the variable-frequency heat pump water heater is emerging. A heating capacity and an energy efficiency of the variable-frequency heat pump water heater are higher than those of the fixed-frequency heat pump water heater, especially under low environment temperature.
- a difference between target temperature of a water tank and current temperature of the water tank is regarded as a feedback, i.e., when the difference is greater than a certain value, the variable-frequency compressor is working at a high frequency as far as possible to produce more heat and shorten a heating time; and when the difference is smaller than the certain value, the frequency of the variable-frequency compressor is adjusted dynamically, and in order to ensure that temperature of the water tank is maintained within a target temperature range, the variable-frequency compressor is working at a lower frequency generally.
- heat produced by the variable-frequency heat pump water heater may increase with an increase of the frequency of the variable-frequency compressor thereof.
- an energy efficiency ratio of the heat pump water heater changes in shape of a parabola, which means that the energy efficiency ratio may decrease with an increase of the frequency of the variable-frequency compressor when the frequency is higher than a certain frequency, and the energy efficiency ratio may decrease with a decrease of the frequency of the variable-frequency compressor when the frequency is lower than the certain frequency.
- a maximum pressure of the variable-frequency compressor may increase firstly and decrease subsequently with an increase of the frequency.
- Embodiments of the present disclosure seek to solve at least one of the problems existing in the related art to at least some extent.
- a first objective of the present disclosure is to provide a method for controlling frequency of a variable-frequency compressor in a heat pump water heater.
- a second objective of the present disclosure is to provide a system for controlling frequency of a variable-frequency compressor in a heat pump water heater.
- the method for controlling frequency of the variable-frequency compressor in the heat pump water heater includes: detecting a water temperature of water flowing out from a heat exchanger and a water tank temperature of a water tank; determining a preset water temperature of the water flowing out from the heat exchanger according to the water tank temperature; and controlling the frequency of the variable-frequency compressor according to the water temperature and the preset water temperature.
- the system for controlling frequency of the variable-frequency compressor in the heat pump water heater includes: the variable-frequency compressor; a heat exchanger connected to the variable-frequency compressor; a first temperature sensor disposed at a water outlet of the heat exchanger, configured to detect a water temperature of water flowing out from the heat exchanger; a water tank connected to the heat exchanger; a second temperature sensor disposed in the water tank, configured to detect a water tank temperature; and a controller, configured to acquire the water temperature from the first temperature sensor and the water tank temperature from the second temperature sensor, and to determine a preset water temperature of the water flowing out from the heat exchanger according to the water tank temperature, and to control the frequency of the variable-frequency compressor according to the water temperature and the preset water temperature.
- FIG. 1 is a flow chart of a method for controlling frequency of a variable-frequency compressor in a heat pump water heater according to an embodiment of the present disclosure
- FIG. 2 is a schematic diagram of a system for controlling frequency of a variable-frequency compressor in a heat pump water heater according to an embodiment of the present disclosure
- FIG. 3 is a schematic diagram of a system for controlling frequency of a variable-frequency compressor in a heat pump water heater according to an embodiment of the present disclosure.
- Variable-frequency compressor 10 heat exchanger 20 , first temperature sensor 30 , water tank 40 , second temperature sensor 50 , controller 60 , throttle 70 , circulating water pump 80 , water-water heat exchanger 90 in the water tank and water-refrigerant heat exchanger 21 .
- FIG. 1 is a flow chart of the method for controlling frequency of the variable-frequency compressor in the heat pump water heater according to an embodiment of the present disclosure.
- the method for controlling frequency of the variable-frequency compressor in the heat pump water heater may include following acts.
- act S 101 water temperature of water flowing out from a heat exchanger and water tank temperature of a water tank are detected.
- a first temperature sensor disposed at a water outlet of the heat exchanger may detect the water temperature of the water flowing out from the heat exchanger, and a second temperature sensor disposed in the water tank may detect the water tank temperature.
- act S 102 preset water temperature of the water flowing out from the heat exchanger is determined according to the water tank temperature.
- the preset water temperature T1S may be determined according to:
- T5 is the water tank temperature
- T1S a1*a2*a3*T5+b, where a1 is a first correction factor for a water-water heat exchanger in the water tank, a2 is a second correction factor for a capacity of a heat pump group, a3 is a third correction factor, and b is a temperature difference correction factor.
- the first correction factor for the water-water heat exchanger in the water tank, the second correction factor for a capacity of a heat pump group, the third correction factor and the temperature difference correction factor may be set according to a practical operating condition, which means that different values may be assigned to each of the water-water heat exchanger in the water tank, the second correction factor for a capacity of a heat pump group, the third correction factor and the temperature difference correction factor in different operating conditions.
- act S 103 the frequency of the variable-frequency compressor is controlled according to the water temperature and the preset water temperature.
- a temperature difference between the water temperature and the preset water temperature may be acquired firstly, and then a temperature range including the temperature difference may be determined, and a correction value may be acquired according to the temperature range, and a target frequency of the variable-frequency compressor may be determined according to the current frequency of the variable-frequency compressor and the correction value.
- a corresponding relationship between the temperature range including the temperature difference and the correction value for the frequency of the variable-frequency compressor may be pre-stored in a frequency controlling system of the variable-frequency compressor, and the temperature difference is a result obtained by subtracting the preset water temperature from the water temperature.
- Table. 1 For example, a table of the pre-stored corresponding relationship between the temperature range and the correction value is shown in Table. 1.
- Table. 1 only shows an example or a part of the corresponding relationship.
- the preset water temperature measured by a thermometer in the water tank is 14° C.
- the water temperature of the water flowing out from the heat exchanger acquired by the second temperature sensor is 15.6° C.
- the current frequency of the variable-frequency compressor is 18 Hz
- the temperature difference between the water temperature and the preset water temperature is computed as 1.6° C. which falls into the temperature range (1, 2] according to Table. 1
- the temperature range (1, 2] corresponds the correction value ⁇ 4 Hz.
- the target frequency of the variable-frequency compressor is acquired by adding the correction value to the current frequency of the variable-frequency compressor, i.e., the target frequency is 12 Hz.
- the target frequency after the target frequency is determined according to the current frequency of the variable-frequency compressor and the correction value, the target frequency can also be adjusted according to a working frequency of the heat pump group.
- the working frequency closest to the target frequency may be acquired by comparing the target frequency with the working frequency of the heat pump group in a set of working frequencies.
- the heat pump group works at different frequencies belong to different working frequency ranges under different water tank temperatures.
- a minimum working frequency and a maximum working frequency of the heat pump group may be acquired firstly under the current water tank temperature, and the working frequency may be compared with the minimum working frequency and the maximum working frequency respectively.
- the working frequency may be determined as the target frequency if the working frequency is between the minimum working frequency and the maximum working frequency, and the maximum working frequency may be determined as the target frequency if the working frequency is greater than the maximum working frequency, and the minimum working frequency may be determined as the target frequency if the working frequency is smaller than the minimum working frequency.
- the minimum working frequency and the maximum working frequency may be determined according to outdoor temperature T4 and the water tank temperature T5.
- a working frequency range of the variable-frequency compressor relates to the outdoor temperature T4 and the water tank temperature T5. Specifically, if the outdoor temperature T4 is smaller than or equal to a first preset temperature threshold and the water tank temperature T5 is greater than or equal to a second preset temperature threshold, or if the outdoor temperature T4 is greater than a third preset temperature threshold and the water tank temperature T5 is greater than or equal to the second preset temperature threshold, the variable-frequency compressor is working at a frequency in a first preset frequency range, the minimum working frequency and the maximum working frequency may be determined according to the first preset frequency range; and if the outdoor temperature T4 is in a first preset temperature range and the water tank temperature T5 is in a second preset temperature range, the variable-frequency compressor is working at a frequency in a second preset frequency range, the minimum working frequency and the maximum working frequency may be determined according to the second
- the first preset temperature threshold is smaller than the third preset temperature threshold and the first preset frequency range is narrower than the second preset frequency range.
- the first temperature threshold is ⁇ 5° C.
- the second temperature threshold is 50° C.
- the third temperature threshold is 30° C.
- the second temperature threshold is 50° C.
- the first temperature range is 5° C.-20° C.
- the second temperature range is 20° C.-40° C. If the outdoor temperature T4 is smaller than or equal to ⁇ 5° C. and the water tank temperature T5 is greater than or equal to 50° C., or if the outdoor temperature T4 is greater than 30° C.
- variable-frequency compressor is working at a frequency in a range of 42-60 Hz, and the minimum working frequency may be determined as 42 Hz and the maximum working frequency may be determined as 60 Hz; and if the outdoor temperature T4 is in 5° C.-20° C. and the water tank temperature T5 is in 20° C.-40° C., the variable-frequency compressor is working at a frequency in a range of 10-92 Hz, and the minimum working frequency may be determined as 10 Hz and the maximum working frequency may be determined as 92 Hz.
- the set of working frequencies of the heat pump group includes a first working frequency F1 equal to 10 Hz, a second working frequency F2 equal to 14 Hz, a third working frequency F3 equal to 18 Hz and a fourth working frequency F4 equal to 22 Hz.
- the working frequency closest to the target frequency Fs is the second working frequency F2 by comparing the target frequency Fs with each of the set of working frequencies, and because 14 Hz is between 11 Hz and 17 Hz, the second working frequency F2 is determined as the target frequency, such that the variable-frequency compressor works at 14 Hz.
- the working frequency of the variable-frequency compressor may be reduced and the working energy efficiency of the heat pump group may be improved effectively.
- the minimum frequency of the heat pump group may be limited when the water temperature is high, such that the reliability of the variable-frequency compressor may be guaranteed.
- the water temperature of the water flowing out from the heat exchanger and the water tank temperature of the water tank are firstly detected, and then the preset water temperature of the water flowing out from the heat exchanger is determined according to the water tank temperature; and the frequency of the variable-frequency compressor is controlled according to the water temperature and the preset water temperature.
- the embodiments of the present disclosure provide a method for controlling the frequency of the variable-frequency compressor based on the water temperature of the water flowing out from the heat exchanger.
- working frequency of the variable-frequency compressor may be reduced effectively, such that working energy efficiency of a heat pump group may be improved.
- working minimum frequency of the variable-frequency compressor may be controlled effectively and thus reliability of the variable-frequency compressor may be guaranteed.
- embodiments of the present disclosure also provide a system for controlling frequency of a variable-frequency compressor in a heat pump water heater.
- FIG. 2 is a schematic diagram of a system for controlling frequency of a variable-frequency compressor in a heat pump water heater according to an embodiment of the present disclosure.
- the system for controlling the frequency of the variable-frequency compressor in the heat pump water heater includes the variable-frequency compressor 10 , a heat exchanger 20 connected to the variable-frequency compressor 10 , a first temperature sensor 30 disposed at a water outlet of the heat exchanger 20 , a water tank 40 connected to the heat exchanger 20 , a second temperature sensor 50 disposed in the water tank 40 and a controller 60 .
- the first temperature sensor 30 is configured to detect water temperature of water flowing out from the heat exchanger 20 ;
- the second temperature sensor 50 is configured to detect water tank temperature of the water tank 40 ; and the controller is configured to acquire the water temperature of the water flowing out from the heat exchanger 20 from the first temperature sensor 30 and the water tank temperature of the water tank 40 from the second temperature sensor 50 , and to determine preset water temperature of the water flowing out from the heat exchanger 20 according to the water tank temperature, and to control the frequency of the variable-frequency compressor 10 according to the water temperature and the preset water temperature of the water flowing out from the heat exchanger 20 .
- the controller 60 may determine the preset water temperature T1S according to:
- T5 is the water tank temperature
- T1S a1*a2*a3*T5+b, in which a1 is a first correction factor for a water-water heat exchanger in the water tank, a2 is a second correction factor for a capacity of a heat pump group, a3 is a third correction factor, and b is a temperature difference correction factor.
- the first correction factor for the water-water heat exchanger in the water tank, the second correction factor for a capacity of a heat pump group, the third correction factor and the temperature difference correction factor may be set according to a practical operating condition, which means that each of the water-water heat exchanger in the water tank, the second correction factor for a capacity of a heat pump group, the third correction factor and the temperature difference correction factor may be have different values in different operating conditions.
- the controller 60 may acquire a temperature difference between the water temperature of the water flowing out from the heat exchanger 20 and the preset water temperature firstly, determine a temperature range including the temperature difference and acquire a correction value according to the temperature range, and determine a target frequency of the variable-frequency compressor 10 according to the current frequency of the variable-frequency compressor 10 and the correction value.
- Table. 1 For example, a table of the pre-stored corresponding relationship between the temperature range and the correction value is shown in Table. 1.
- Table. 1 only shows an example or a part of the corresponding relationship.
- the preset water temperature of the water flowing out from the heat exchanger 20 computed according to the water tank temporary is 14° C.
- the water temperature of the water flowing out from the heat exchanger acquired by the second temperature sensor 50 is 15.6° C.
- the current frequency of the variable-frequency compressor 10 is 18 Hz.
- the temperature difference between the water temperature and the preset water temperature is computed as 1.6° C. which falls into the temperature range (1, 2] according to Table. 1, and the temperature range (1, 2] corresponds the correction value ⁇ 4 Hz.
- the target frequency of the variable-frequency compressor is acquired by adding the correction value to the current frequency of the variable-frequency compressor, i.e., the target frequency is 12 Hz.
- the controller 60 may also adjust the target frequency according to a working frequency of the heat pump group.
- the controller 60 may acquire the working frequency closest to the target frequency of the variable-frequency compressor 10 by comparing the target frequency with a working frequency of the heat pump group in a set of working frequencies.
- working frequency ranges of the heat pump group are different in different water tank temperatures.
- a minimum working frequency and a maximum working frequency of the heat pump group may be acquired firstly under the current water tank temperature, and the working frequency closest to the target frequency may be compared with the minimum working frequency and the maximum working frequency respectively.
- the working frequency closest to the target frequency may be determined as the target frequency if the working frequency closest to the target frequency is between the minimum working frequency and the maximum working frequency
- the maximum working frequency may be determined as the target frequency if the working frequency closest to the target frequency is greater than the maximum working frequency
- the minimum working frequency may be determined as the target frequency if the working frequency closest to the target frequency is smaller than the minimum working frequency.
- the controller 60 may determine the minimum working frequency and the maximum working frequency according to outdoor temperature T4 and the water tank temperature T5. Specifically, a working frequency range of the variable-frequency compressor relates to the outdoor temperature T4 and the water tank temperature T5.
- the variable-frequency compressor is working at a frequency in a first preset frequency range, and the minimum working frequency and the maximum working frequency may be determined according to the first preset frequency range; and if the outdoor temperature T4 is in a first preset temperature range and the water tank temperature T5 is in a second preset temperature range, the variable-frequency compressor is working at a frequency in a second preset frequency range, and the minimum working frequency and the maximum working frequency may be determined according to the second preset frequency range.
- the first preset temperature threshold is smaller than the third preset temperature threshold and the first preset frequency range is narrower than the second preset frequency range.
- the first temperature threshold is ⁇ 5° C.
- the second temperature threshold is 50° C.
- the third temperature threshold is 30° C.
- the first temperature range is 5° C.-20° C.
- the second temperature range is 20° C.-40° C. If the outdoor temperature T4 is smaller than or equal to ⁇ 5° C. and the water tank temperature T5 is greater than or equal to 50° C., or if the outdoor temperature T4 is greater than 30° C.
- the working frequency range of the variable-frequency compressor is 42-60 Hz and then the control 60 may determine the minimum working frequency as 42 Hz and the maximum working frequency as 60 Hz; and if the outdoor temperature T4 is in 5° C.-20° C., the water tank temperature T5 is in 20° C.-40° C., the working frequency range of the variable-frequency compressor is 10-92 Hz and then the controller 60 may determine that the minimum working frequency is 10 Hz and the maximum working frequency is 92 Hz.
- the set of working frequencies of the heat pump group includes a first working frequency F1 equal to 10 Hz, a second working frequency F2 equal to 14 Hz, a third working frequency F3 equal to 18 Hz and a fourth working frequency F4 equal to 22 Hz.
- the controller 60 may determine that the second working frequency F2 is the target frequency of the variable-frequency compressor 10 and enables the variable-frequency compressor 10 to work at 14 Hz.
- FIG. 3 illustrates a schematic diagram of a system for controlling frequency of a variable-frequency compressor in a heat pump water heater.
- the heat exchanger 20 between variable-frequency compressor 10 and the throttle 70 may be a water- refrigerant heat exchanger or an air-refrigerant heat exchanger.
- the water tank 40 includes a second temperature sensor 50 and a water-water heat exchanger 90 , and the water-water heat exchanger 90 in the water tank is connected to the water-refrigerant heat exchanger 21 via a circulating water pump 80 .
- the controller acquires the water temperature from the first temperature sensor and the water tank temperature from the second temperature sensor, and then determines preset water temperature according to the water tank temperature, and controls the frequency of the variable-frequency compressor according to the water temperature and the preset water temperature.
- the embodiments of the present disclosure provide a method for controlling the frequency of the variable-frequency compressor based on the water temperature of the water flowing out from the heat exchanger. When temperature in a water tank is low, working frequency of the variable-frequency compressor may be reduced effectively, such that working energy efficiency may be improved. Meanwhile, in case of ensuring the water temperature is constant, working minimum frequency of the variable-frequency compressor may be controlled effectively and thus reliability of the variable-frequency compressor may be ensured.
- first and second are used herein for purposes of description and are not intended to indicate or imply relative importance or significance.
- the feature defined with “first” and “second” may comprise one or more this feature.
- a plurality of means two or more than two, unless specified otherwise.
- the flow chart or any process or method described herein in other manners may represent a module, segment, or portion of code that comprises one or more executable instructions to implement the specified logic function(s) or that comprises one or more executable instructions of the steps of the progress.
- the scope of a preferred embodiment of the present disclosure includes other implementations in which the order of execution may differ from that which is depicted in the flow chart, which should be understood by those skilled in the art.
- the logic and/or step described in other manners herein or shown in the flow chart, for example, a particular sequence table of executable instructions for realizing the logical function may be specifically achieved in any computer readable medium to be used by the instruction execution system, device or equipment (such as the system based on computers, the system comprising processors or other systems capable of obtaining the instruction from the instruction execution system, device and equipment and executing the instruction), or to be used in combination with the instruction execution system, device and equipment.
- the computer readable medium may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment.
- the computer readable medium comprise but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or a flash memory), an optical fiber device and a portable compact disk read-only memory (CDROM).
- the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.
- a plurality of steps or methods may be stored in a memory and achieved by software or firmware executed by a suitable instruction executing system.
- the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.
- each function cell of the embodiments of the present disclosure may be integrated in a processing module, or these cells may be separate physical existence, or two or more cells are integrated in a processing module.
- the integrated module may be realized in a form of hardware or in a form of software function modules. When the integrated module is realized in a form of software function module and is sold or used as a standalone product, the integrated module may be stored in a computer readable memory medium.
- the above-mentioned memory medium may be a read-only memory, a magnetic disc, an optical disc, etc.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
- This application is a U.S. national phase application of International Application No. PCT/CN2015/084252, filed with the State Intellectual Property Office of P. R. China on Jul. 16, 2015, which claims priority to and benefits of Chinese Patent Application Serial No. 201510268372.7, entitled “Method and system for controlling frequency of variable-frequency compressor in heat pump water heater”, filed with the State Intellectual Property Office of P. R. China on May. 22, 2015, the entire content of which is incorporated herein by reference.
- The present disclosure relates to heat pump water heater technology, and more particularly relates to a method and a system for controlling frequency of a variable-frequency compressor in a heat pump water heater.
- In recent years, as an effective energy-saving and environment-friendly equipment, the heat pump water heater has been used increasingly around the world. With the development of variable-frequency technology, the variable-frequency heat pump water heater is emerging. A heating capacity and an energy efficiency of the variable-frequency heat pump water heater are higher than those of the fixed-frequency heat pump water heater, especially under low environment temperature.
- At present, in the frequency control method used for the variable-frequency compressor in the heat pump water heater, a difference between target temperature of a water tank and current temperature of the water tank is regarded as a feedback, i.e., when the difference is greater than a certain value, the variable-frequency compressor is working at a high frequency as far as possible to produce more heat and shorten a heating time; and when the difference is smaller than the certain value, the frequency of the variable-frequency compressor is adjusted dynamically, and in order to ensure that temperature of the water tank is maintained within a target temperature range, the variable-frequency compressor is working at a lower frequency generally.
- In general, heat produced by the variable-frequency heat pump water heater may increase with an increase of the frequency of the variable-frequency compressor thereof. However, an energy efficiency ratio of the heat pump water heater changes in shape of a parabola, which means that the energy efficiency ratio may decrease with an increase of the frequency of the variable-frequency compressor when the frequency is higher than a certain frequency, and the energy efficiency ratio may decrease with a decrease of the frequency of the variable-frequency compressor when the frequency is lower than the certain frequency. Thus, with an existing method for controlling the frequency of the variable-frequency compressor in the heat pump water heater by controlling the temperature in the water tank, the energy-saving advantage of the variable-frequency heat pump water heater cannot be exploited sufficiently and reliability of the variable-frequency compressor cannot be guaranteed. Additionally, a maximum pressure of the variable-frequency compressor may increase firstly and decrease subsequently with an increase of the frequency.
- Embodiments of the present disclosure seek to solve at least one of the problems existing in the related art to at least some extent.
- Accordingly, a first objective of the present disclosure is to provide a method for controlling frequency of a variable-frequency compressor in a heat pump water heater.
- A second objective of the present disclosure is to provide a system for controlling frequency of a variable-frequency compressor in a heat pump water heater.
- In order to achieve the above objectives, the method for controlling frequency of the variable-frequency compressor in the heat pump water heater according to embodiments of a first aspect of the present disclosure includes: detecting a water temperature of water flowing out from a heat exchanger and a water tank temperature of a water tank; determining a preset water temperature of the water flowing out from the heat exchanger according to the water tank temperature; and controlling the frequency of the variable-frequency compressor according to the water temperature and the preset water temperature.
- In order to achieve the above objectives, the system for controlling frequency of the variable-frequency compressor in the heat pump water heater according to embodiments of a second aspect of the present disclosure includes: the variable-frequency compressor; a heat exchanger connected to the variable-frequency compressor; a first temperature sensor disposed at a water outlet of the heat exchanger, configured to detect a water temperature of water flowing out from the heat exchanger; a water tank connected to the heat exchanger; a second temperature sensor disposed in the water tank, configured to detect a water tank temperature; and a controller, configured to acquire the water temperature from the first temperature sensor and the water tank temperature from the second temperature sensor, and to determine a preset water temperature of the water flowing out from the heat exchanger according to the water tank temperature, and to control the frequency of the variable-frequency compressor according to the water temperature and the preset water temperature.
- Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.
- These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which:
-
FIG. 1 is a flow chart of a method for controlling frequency of a variable-frequency compressor in a heat pump water heater according to an embodiment of the present disclosure; -
FIG. 2 is a schematic diagram of a system for controlling frequency of a variable-frequency compressor in a heat pump water heater according to an embodiment of the present disclosure; -
FIG. 3 is a schematic diagram of a system for controlling frequency of a variable-frequency compressor in a heat pump water heater according to an embodiment of the present disclosure. - Variable-
frequency compressor 10,heat exchanger 20,first temperature sensor 30,water tank 40,second temperature sensor 50,controller 60,throttle 70, circulatingwater pump 80, water-water heat exchanger 90 in the water tank and water-refrigerant heat exchanger 21. - Reference will be made in detail to embodiments of the present disclosure, where the same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions. The embodiments described herein with reference to drawings are explanatory, and used to generally understand the present disclosure. The embodiments shall not be construed to limit the present disclosure.
- A method and a system for controlling frequency of a variable-frequency compressor in a heat pump water heater according to embodiments of the present disclosure will be further described with reference to drawings.
-
FIG. 1 is a flow chart of the method for controlling frequency of the variable-frequency compressor in the heat pump water heater according to an embodiment of the present disclosure. - As shown in
FIG. 1 , the method for controlling frequency of the variable-frequency compressor in the heat pump water heater may include following acts. - In act S101, water temperature of water flowing out from a heat exchanger and water tank temperature of a water tank are detected.
- Specifically, when the variable-frequency heat pump water heater is working, a first temperature sensor disposed at a water outlet of the heat exchanger may detect the water temperature of the water flowing out from the heat exchanger, and a second temperature sensor disposed in the water tank may detect the water tank temperature.
- In act S102, preset water temperature of the water flowing out from the heat exchanger is determined according to the water tank temperature.
- After the water tank temperature is acquired, the preset water temperature T1S may be determined according to:
-
T1S=f(T5) - where T5 is the water tank temperature.
- For example, T1S=a1*a2*a3*T5+b, where a1 is a first correction factor for a water-water heat exchanger in the water tank, a2 is a second correction factor for a capacity of a heat pump group, a3 is a third correction factor, and b is a temperature difference correction factor.
- It should be noted that the first correction factor for the water-water heat exchanger in the water tank, the second correction factor for a capacity of a heat pump group, the third correction factor and the temperature difference correction factor may be set according to a practical operating condition, which means that different values may be assigned to each of the water-water heat exchanger in the water tank, the second correction factor for a capacity of a heat pump group, the third correction factor and the temperature difference correction factor in different operating conditions.
- In act S103, the frequency of the variable-frequency compressor is controlled according to the water temperature and the preset water temperature.
- In an embodiment of the present disclosure, after the preset water temperature of the water flowing out from the heat exchanger is determined according to the water tank temperature, a temperature difference between the water temperature and the preset water temperature may be acquired firstly, and then a temperature range including the temperature difference may be determined, and a correction value may be acquired according to the temperature range, and a target frequency of the variable-frequency compressor may be determined according to the current frequency of the variable-frequency compressor and the correction value.
- A corresponding relationship between the temperature range including the temperature difference and the correction value for the frequency of the variable-frequency compressor may be pre-stored in a frequency controlling system of the variable-frequency compressor, and the temperature difference is a result obtained by subtracting the preset water temperature from the water temperature.
- For example, a table of the pre-stored corresponding relationship between the temperature range and the correction value is shown in Table. 1.
-
TABLE 1 Table of the corresponding relationship temperature range (° C.) correction value (Hz) (2, 3] −8 Hz (1, 2] −4 Hz [−1, 1] 0 Hz (−1, −2] 4 Hz (−2, −3] 8 Hz - It should be noted that Table. 1 only shows an example or a part of the corresponding relationship.
- For example, assume that the corresponding relationship is shown in Table. 1, the preset water temperature measured by a thermometer in the water tank is 14° C., the water temperature of the water flowing out from the heat exchanger acquired by the second temperature sensor is 15.6° C., and the current frequency of the variable-frequency compressor is 18 Hz, then the temperature difference between the water temperature and the preset water temperature is computed as 1.6° C. which falls into the temperature range (1, 2] according to Table. 1, and the temperature range (1, 2] corresponds the correction value −4 Hz. Thus, the target frequency of the variable-frequency compressor is acquired by adding the correction value to the current frequency of the variable-frequency compressor, i.e., the target frequency is 12 Hz.
- Additionally, in this embodiment, after the target frequency is determined according to the current frequency of the variable-frequency compressor and the correction value, the target frequency can also be adjusted according to a working frequency of the heat pump group.
- Specifically, the working frequency closest to the target frequency may be acquired by comparing the target frequency with the working frequency of the heat pump group in a set of working frequencies.
- Generally, the heat pump group works at different frequencies belong to different working frequency ranges under different water tank temperatures. After the working frequency closest to the target frequency is acquired, a minimum working frequency and a maximum working frequency of the heat pump group may be acquired firstly under the current water tank temperature, and the working frequency may be compared with the minimum working frequency and the maximum working frequency respectively. The working frequency may be determined as the target frequency if the working frequency is between the minimum working frequency and the maximum working frequency, and the maximum working frequency may be determined as the target frequency if the working frequency is greater than the maximum working frequency, and the minimum working frequency may be determined as the target frequency if the working frequency is smaller than the minimum working frequency.
- In an embodiment of the present disclosure, the minimum working frequency and the maximum working frequency may be determined according to outdoor temperature T4 and the water tank temperature T5. Specifically, a working frequency range of the variable-frequency compressor relates to the outdoor temperature T4 and the water tank temperature T5. Specifically, if the outdoor temperature T4 is smaller than or equal to a first preset temperature threshold and the water tank temperature T5 is greater than or equal to a second preset temperature threshold, or if the outdoor temperature T4 is greater than a third preset temperature threshold and the water tank temperature T5 is greater than or equal to the second preset temperature threshold, the variable-frequency compressor is working at a frequency in a first preset frequency range, the minimum working frequency and the maximum working frequency may be determined according to the first preset frequency range; and if the outdoor temperature T4 is in a first preset temperature range and the water tank temperature T5 is in a second preset temperature range, the variable-frequency compressor is working at a frequency in a second preset frequency range, the minimum working frequency and the maximum working frequency may be determined according to the second preset frequency range.
- It should be noted that the first preset temperature threshold is smaller than the third preset temperature threshold and the first preset frequency range is narrower than the second preset frequency range.
- For example, assume that the first temperature threshold is −5° C., the second temperature threshold is 50° C., the third temperature threshold is 30° C., the second temperature threshold is 50° C., the first temperature range is 5° C.-20° C. and the second temperature range is 20° C.-40° C. If the outdoor temperature T4 is smaller than or equal to −5° C. and the water tank temperature T5 is greater than or equal to 50° C., or if the outdoor temperature T4 is greater than 30° C. and the water tank temperature T5 is greater than or equal to 50° C., the variable-frequency compressor is working at a frequency in a range of 42-60 Hz, and the minimum working frequency may be determined as 42 Hz and the maximum working frequency may be determined as 60 Hz; and if the outdoor temperature T4 is in 5° C.-20° C. and the water tank temperature T5 is in 20° C.-40° C., the variable-frequency compressor is working at a frequency in a range of 10-92 Hz, and the minimum working frequency may be determined as 10 Hz and the maximum working frequency may be determined as 92 Hz. For example, assume that the target frequency Fs of the variable-frequency compressor computed according to the water temperature and the preset water temperature is 15 Hz, the set of working frequencies of the heat pump group includes a first working frequency F1 equal to 10 Hz, a second working frequency F2 equal to 14 Hz, a third working frequency F3 equal to 18 Hz and a fourth working frequency F4 equal to 22 Hz. If the maximum working frequency Fmax of the heat pump group under the current water tank temperature is 17 Hz and the minimum working frequency Fmin of the heat pump group under the current water tank temperature is 11 Hz, after the target frequency Fs is acquired, the working frequency closest to the target frequency Fs is the second working frequency F2 by comparing the target frequency Fs with each of the set of working frequencies, and because 14 Hz is between 11 Hz and 17 Hz, the second working frequency F2 is determined as the target frequency, such that the variable-frequency compressor works at 14 Hz.
- Thus, by using the water temperature of the water flowing out from the heat exchanger to control the frequency of the variable-frequency compressor, the working frequency of the variable-frequency compressor may be reduced and the working energy efficiency of the heat pump group may be improved effectively. The minimum frequency of the heat pump group may be limited when the water temperature is high, such that the reliability of the variable-frequency compressor may be guaranteed.
- With the method according to embodiments of the present disclosure, the water temperature of the water flowing out from the heat exchanger and the water tank temperature of the water tank are firstly detected, and then the preset water temperature of the water flowing out from the heat exchanger is determined according to the water tank temperature; and the frequency of the variable-frequency compressor is controlled according to the water temperature and the preset water temperature. The embodiments of the present disclosure provide a method for controlling the frequency of the variable-frequency compressor based on the water temperature of the water flowing out from the heat exchanger. When temperature in a water tank is low, working frequency of the variable-frequency compressor may be reduced effectively, such that working energy efficiency of a heat pump group may be improved. Meanwhile, in case of ensuring constant water temperature, working minimum frequency of the variable-frequency compressor may be controlled effectively and thus reliability of the variable-frequency compressor may be guaranteed.
- In order to achieve the above objectives, embodiments of the present disclosure also provide a system for controlling frequency of a variable-frequency compressor in a heat pump water heater.
-
FIG. 2 is a schematic diagram of a system for controlling frequency of a variable-frequency compressor in a heat pump water heater according to an embodiment of the present disclosure. - As shown in
FIG. 2 , the system for controlling the frequency of the variable-frequency compressor in the heat pump water heater includes the variable-frequency compressor 10, aheat exchanger 20 connected to the variable-frequency compressor 10, afirst temperature sensor 30 disposed at a water outlet of theheat exchanger 20, awater tank 40 connected to theheat exchanger 20, asecond temperature sensor 50 disposed in thewater tank 40 and acontroller 60. - The
first temperature sensor 30 is configured to detect water temperature of water flowing out from theheat exchanger 20; thesecond temperature sensor 50 is configured to detect water tank temperature of thewater tank 40; and the controller is configured to acquire the water temperature of the water flowing out from theheat exchanger 20 from thefirst temperature sensor 30 and the water tank temperature of thewater tank 40 from thesecond temperature sensor 50, and to determine preset water temperature of the water flowing out from theheat exchanger 20 according to the water tank temperature, and to control the frequency of the variable-frequency compressor 10 according to the water temperature and the preset water temperature of the water flowing out from theheat exchanger 20. - The
controller 60 may determine the preset water temperature T1S according to: -
T1S=f(T5), - in which T5 is the water tank temperature.
- For example, T1S=a1*a2*a3*T5+b, in which a1 is a first correction factor for a water-water heat exchanger in the water tank, a2 is a second correction factor for a capacity of a heat pump group, a3 is a third correction factor, and b is a temperature difference correction factor.
- It should be noted that the first correction factor for the water-water heat exchanger in the water tank, the second correction factor for a capacity of a heat pump group, the third correction factor and the temperature difference correction factor may be set according to a practical operating condition, which means that each of the water-water heat exchanger in the water tank, the second correction factor for a capacity of a heat pump group, the third correction factor and the temperature difference correction factor may be have different values in different operating conditions.
- After the
controller 60 determines the preset water temperature of the water flowing out from theheat exchanger 20 according to the water tank temperature, thecontroller 60 may acquire a temperature difference between the water temperature of the water flowing out from theheat exchanger 20 and the preset water temperature firstly, determine a temperature range including the temperature difference and acquire a correction value according to the temperature range, and determine a target frequency of the variable-frequency compressor 10 according to the current frequency of the variable-frequency compressor 10 and the correction value. - For example, a table of the pre-stored corresponding relationship between the temperature range and the correction value is shown in Table. 1.
-
TABLE 1 Table of the corresponding relationship temperature range (° C.) correction value (Hz) (2, 3] −8 Hz (1, 2] −4 Hz [−1, 1] 0 Hz (−1, −2] 4 Hz (−2, −3] 8 Hz - It should be noted that Table. 1 only shows an example or a part of the corresponding relationship.
- For example, assume that the corresponding relationship is shown in Table. 1, the preset water temperature of the water flowing out from the
heat exchanger 20 computed according to the water tank temporary is 14° C., the water temperature of the water flowing out from the heat exchanger acquired by thesecond temperature sensor 50 is 15.6° C., and the current frequency of the variable-frequency compressor 10 is 18 Hz. The temperature difference between the water temperature and the preset water temperature is computed as 1.6° C. which falls into the temperature range (1, 2] according to Table. 1, and the temperature range (1, 2] corresponds the correction value −4 Hz. Thus, the target frequency of the variable-frequency compressor is acquired by adding the correction value to the current frequency of the variable-frequency compressor, i.e., the target frequency is 12 Hz. - Additionally, in this embodiment, after the
controller 60 determines the target frequency of the variable-frequency compressor 10 according to the current frequency of the variable-frequency compressor 10 and the correction value, thecontroller 60 may also adjust the target frequency according to a working frequency of the heat pump group. - Specifically, the
controller 60 may acquire the working frequency closest to the target frequency of the variable-frequency compressor 10 by comparing the target frequency with a working frequency of the heat pump group in a set of working frequencies. - Generally, working frequency ranges of the heat pump group are different in different water tank temperatures. After the
controller 60 acquires the working frequency closest to the target frequency, a minimum working frequency and a maximum working frequency of the heat pump group may be acquired firstly under the current water tank temperature, and the working frequency closest to the target frequency may be compared with the minimum working frequency and the maximum working frequency respectively. The working frequency closest to the target frequency may be determined as the target frequency if the working frequency closest to the target frequency is between the minimum working frequency and the maximum working frequency, and the maximum working frequency may be determined as the target frequency if the working frequency closest to the target frequency is greater than the maximum working frequency, and the minimum working frequency may be determined as the target frequency if the working frequency closest to the target frequency is smaller than the minimum working frequency. - In an embodiment of the present disclosure, the
controller 60 may determine the minimum working frequency and the maximum working frequency according to outdoor temperature T4 and the water tank temperature T5. Specifically, a working frequency range of the variable-frequency compressor relates to the outdoor temperature T4 and the water tank temperature T5. Specifically, if the outdoor temperature T4 is smaller than or equal to a first preset temperature threshold and the water tank temperature T5 is greater than or equal to a second preset temperature threshold, or if the outdoor temperature T4 is greater than a third preset temperature threshold and the water tank temperature T5 is greater than or equal to the second preset temperature threshold, the variable-frequency compressor is working at a frequency in a first preset frequency range, and the minimum working frequency and the maximum working frequency may be determined according to the first preset frequency range; and if the outdoor temperature T4 is in a first preset temperature range and the water tank temperature T5 is in a second preset temperature range, the variable-frequency compressor is working at a frequency in a second preset frequency range, and the minimum working frequency and the maximum working frequency may be determined according to the second preset frequency range. - It should be noted that the first preset temperature threshold is smaller than the third preset temperature threshold and the first preset frequency range is narrower than the second preset frequency range.
- For example, assume that the first temperature threshold is −5° C., the second temperature threshold is 50° C., the third temperature threshold is 30° C., the first temperature range is 5° C.-20° C. and the second temperature range is 20° C.-40° C. If the outdoor temperature T4 is smaller than or equal to −5° C. and the water tank temperature T5 is greater than or equal to 50° C., or if the outdoor temperature T4 is greater than 30° C. and the water tank temperature T5 is greater than or equal to 50° C., the working frequency range of the variable-frequency compressor is 42-60 Hz and then the
control 60 may determine the minimum working frequency as 42 Hz and the maximum working frequency as 60 Hz; and if the outdoor temperature T4 is in 5° C.-20° C., the water tank temperature T5 is in 20° C.-40° C., the working frequency range of the variable-frequency compressor is 10-92 Hz and then thecontroller 60 may determine that the minimum working frequency is 10 Hz and the maximum working frequency is 92 Hz. - For example, assume that the target frequency Fs of the variable-
frequency compressor 10 computed according to the water temperature and the preset water temperature is 15 Hz, the set of working frequencies of the heat pump group includes a first working frequency F1 equal to 10 Hz, a second working frequency F2 equal to 14 Hz, a third working frequency F3 equal to 18 Hz and a fourth working frequency F4 equal to 22 Hz. If the maximum working frequency Fmax of the heat pump group under the current water tank temperature is 17 Hz and the minimum working frequency Fmin of the heat pump group under the current water tank temperature is 11 Hz, after the target frequency Fs is acquired, it may be determined that the working frequency closest to the target frequency Fs is the second working frequency F2 by comparing the target frequency Fs with each of the set of working frequencies, and because 14 Hz is between 11 Hz and 17 Hz, thecontroller 60 may determine that the second working frequency F2 is the target frequency of the variable-frequency compressor 10 and enables the variable-frequency compressor 10 to work at 14 Hz. -
FIG. 3 illustrates a schematic diagram of a system for controlling frequency of a variable-frequency compressor in a heat pump water heater. Theheat exchanger 20 between variable-frequency compressor 10 and thethrottle 70 may be a water- refrigerant heat exchanger or an air-refrigerant heat exchanger. Thewater tank 40 includes asecond temperature sensor 50 and a water-water heat exchanger 90, and the water-water heat exchanger 90 in the water tank is connected to the water-refrigerant heat exchanger 21 via a circulatingwater pump 80. - With the system according to embodiments of the present disclosure, the controller acquires the water temperature from the first temperature sensor and the water tank temperature from the second temperature sensor, and then determines preset water temperature according to the water tank temperature, and controls the frequency of the variable-frequency compressor according to the water temperature and the preset water temperature. The embodiments of the present disclosure provide a method for controlling the frequency of the variable-frequency compressor based on the water temperature of the water flowing out from the heat exchanger. When temperature in a water tank is low, working frequency of the variable-frequency compressor may be reduced effectively, such that working energy efficiency may be improved. Meanwhile, in case of ensuring the water temperature is constant, working minimum frequency of the variable-frequency compressor may be controlled effectively and thus reliability of the variable-frequency compressor may be ensured.
- In the description of embodiments of the present disclosure, reference throughout this specification to “one embodiment”, “some embodiments,” “an embodiment” , “a specific example,” or “some examples,” means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the appearances of the phrases in various places throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples. In addition, in a case without contradictions, different embodiments or examples or features of different embodiments or examples may be combined by those skilled in the art.
- Those skilled in the art shall understand that terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance. Thus, the feature defined with “first” and “second” may comprise one or more this feature. In the description of the present disclosure, “a plurality of” means two or more than two, unless specified otherwise.
- It will be understood that, the flow chart or any process or method described herein in other manners may represent a module, segment, or portion of code that comprises one or more executable instructions to implement the specified logic function(s) or that comprises one or more executable instructions of the steps of the progress. And the scope of a preferred embodiment of the present disclosure includes other implementations in which the order of execution may differ from that which is depicted in the flow chart, which should be understood by those skilled in the art.
- The logic and/or step described in other manners herein or shown in the flow chart, for example, a particular sequence table of executable instructions for realizing the logical function, may be specifically achieved in any computer readable medium to be used by the instruction execution system, device or equipment (such as the system based on computers, the system comprising processors or other systems capable of obtaining the instruction from the instruction execution system, device and equipment and executing the instruction), or to be used in combination with the instruction execution system, device and equipment. As to the specification, “the computer readable medium” may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment. More specific examples of the computer readable medium comprise but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or a flash memory), an optical fiber device and a portable compact disk read-only memory (CDROM). In addition, the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.
- It should be understood that the various parts of the present disclosure may be realized by hardware, software, firmware or combinations thereof. In the above embodiments, a plurality of steps or methods may be stored in a memory and achieved by software or firmware executed by a suitable instruction executing system. For example, if it is realized by the hardware, likewise in another embodiment, the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.
- Those skilled in the art shall understand that all or parts of the steps in the above exemplifying method of the present disclosure may be achieved by commanding the related hardware with programs. The programs may be stored in a computer readable memory medium, and the programs comprise one or a combination of the steps in the method embodiments of the present disclosure when run on a computer.
- In addition, each function cell of the embodiments of the present disclosure may be integrated in a processing module, or these cells may be separate physical existence, or two or more cells are integrated in a processing module. The integrated module may be realized in a form of hardware or in a form of software function modules. When the integrated module is realized in a form of software function module and is sold or used as a standalone product, the integrated module may be stored in a computer readable memory medium.
- The above-mentioned memory medium may be a read-only memory, a magnetic disc, an optical disc, etc. Although explanatory embodiments have been shown and described, it would be appreciated that the above embodiments are explanatory and cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from scope of the present disclosure by those skilled in the art.
Claims (19)
T1S=f(T5),
T1S=a1*a2*a3*T5+b,
T1S=f(T5),
T1S=a1*a2*a3*T5+b,
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201510268372.7 | 2015-05-22 | ||
CN201510268372.7A CN104833102A (en) | 2015-05-22 | 2015-05-22 | Frequency control method and system for electric frequency conversion heat pump hot water machine compressor |
PCT/CN2015/084252 WO2016187939A1 (en) | 2015-05-22 | 2015-07-16 | Frequency control method and system for variable frequency compressor of heat pump hot water machine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20180106483A1 true US20180106483A1 (en) | 2018-04-19 |
Family
ID=53811159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/501,122 Abandoned US20180106483A1 (en) | 2015-05-22 | 2015-07-16 | Method and system for controlling frequency of variable-frequency compressor in heat pump water heater |
Country Status (4)
Country | Link |
---|---|
US (1) | US20180106483A1 (en) |
EP (1) | EP3299744A4 (en) |
CN (1) | CN104833102A (en) |
WO (1) | WO2016187939A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20200011569A1 (en) * | 2017-04-19 | 2020-01-09 | Mitsubishi Electric Corporation | Heat pump apparatus |
CN112963897A (en) * | 2021-03-17 | 2021-06-15 | 北京华远意通热力科技股份有限公司 | Distributed variable frequency control system |
US20210199343A1 (en) * | 2019-12-30 | 2021-07-01 | Lg Electronics Inc. | Water heater controlled by frequency regulation of inverter |
CN114704959A (en) * | 2022-03-29 | 2022-07-05 | 广东纽恩泰新能源科技发展有限公司 | Control method and device for variable-frequency heat pump water heater, electronic equipment and storage medium |
CN118289863A (en) * | 2024-06-06 | 2024-07-05 | 瑞纳智能设备股份有限公司 | Self-adaptive adjusting method for water processor, electronic equipment and water processor |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105091242B (en) * | 2015-08-31 | 2018-03-02 | 青岛海尔空调器有限总公司 | A kind of wall-hanging air conditioner control method |
CN105042797B (en) * | 2015-08-31 | 2018-01-23 | 青岛海尔空调器有限总公司 | A kind of wall-mounted transducer air conditioning control method |
CN105180357B (en) * | 2015-08-31 | 2018-01-23 | 青岛海尔空调器有限总公司 | Wall-hanging air conditioner control method |
CN105805953A (en) * | 2016-03-18 | 2016-07-27 | 广东美的暖通设备有限公司 | Compressor control method and device in water heating mode |
CN108253630A (en) * | 2016-12-29 | 2018-07-06 | 青岛经济技术开发区海尔热水器有限公司 | Control method of variable-frequency heat pump water heater |
CN106949623A (en) * | 2017-03-29 | 2017-07-14 | 广东美的暖通设备有限公司 | A kind of air-source water heater method for heating and controlling and device |
CN107131616A (en) * | 2017-06-13 | 2017-09-05 | 珠海格力电器股份有限公司 | Variable frequency air conditioner and anti-freezing method, device and system thereof |
CN108800423A (en) * | 2018-05-25 | 2018-11-13 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioner adopting method |
CN109237751B (en) * | 2018-07-25 | 2021-06-11 | 广东芬尼能源技术有限公司 | Method, device, equipment and medium for quickly achieving unit target capacity |
CN109140710B (en) * | 2018-08-24 | 2021-05-04 | 重庆美的通用制冷设备有限公司 | Modular air conditioning unit series-parallel connection identification method and device and electronic equipment |
CN110160126B (en) * | 2019-04-18 | 2021-02-09 | 广东智科电子股份有限公司 | Variable-frequency heating multi-split control method, device, equipment and storage medium |
CN110145906B (en) * | 2019-05-16 | 2021-10-26 | 广东美的暖通设备有限公司 | Refrigerant circulation system, control method thereof and computer readable storage medium |
CN112013447B (en) * | 2019-05-30 | 2022-04-22 | 青岛海尔新能源电器有限公司 | Control method for air source heat pump heating unit |
CN110319596B (en) * | 2019-07-12 | 2021-01-01 | 四川虹美智能科技有限公司 | Method and device for adjusting frequency of compressor of air energy water heater |
CN110513930B (en) * | 2019-09-05 | 2021-07-13 | 四川长虹空调有限公司 | Loading and unloading control method for variable-frequency compressor of air source heat pump unit |
CN110793088A (en) * | 2019-10-29 | 2020-02-14 | 广东芬尼克兹节能设备有限公司 | Water temperature control method of heat pump system and heat pump system |
WO2021191949A1 (en) * | 2020-03-23 | 2021-09-30 | 東芝キヤリア株式会社 | Heat pump heat source device and heat pump water heater |
CN111426059A (en) * | 2020-04-29 | 2020-07-17 | 广东芬尼能源技术有限公司 | Control method and device of multi-unit parallel heat pump system |
CN111735242A (en) * | 2020-06-28 | 2020-10-02 | 广东华天成新能源科技股份有限公司 | Intelligent control scheme of heat pump system |
CN115046308B (en) * | 2021-03-08 | 2024-05-03 | 青岛海尔新能源电器有限公司 | Water heater control method and device, water heater and storage medium |
CN113834150B (en) * | 2021-09-27 | 2022-09-27 | 广东美的制冷设备有限公司 | Multi-online heat pump system, control method thereof and computer readable storage medium |
CN114046603B (en) * | 2021-10-26 | 2023-04-11 | 广东芬尼克兹节能设备有限公司 | Frequency adjustment and hot water control method, device, terminal device and storage medium |
CN114754464B (en) * | 2022-04-18 | 2023-11-24 | 青岛海尔空调电子有限公司 | Air conditioner control method, system, device, medium and air conditioner |
CN114739013B (en) * | 2022-04-26 | 2023-11-14 | 浙江中广电器集团股份有限公司 | Variable frequency control method of heat pump water heater and variable frequency water heater system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130312443A1 (en) * | 2011-02-14 | 2013-11-28 | Mitsubishi Electric Corporation | Refrigeration cycle apparatus and refrigeration cycle control method |
US9562696B2 (en) * | 2010-04-15 | 2017-02-07 | Mitsubishi Electric Corporation | Hot water supply system control apparatus and hot water supply system control program and hot water supply system operating method |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005098546A (en) * | 2003-09-22 | 2005-04-14 | Matsushita Electric Ind Co Ltd | Heat pump type water heater |
JP3918804B2 (en) * | 2003-11-17 | 2007-05-23 | 松下電器産業株式会社 | Heat pump water heater |
JP2006317038A (en) * | 2005-05-11 | 2006-11-24 | Matsushita Electric Ind Co Ltd | Heat pump type water heater |
JP5034367B2 (en) * | 2006-08-10 | 2012-09-26 | パナソニック株式会社 | Heat pump water heater |
CN101846389B (en) * | 2009-06-11 | 2012-05-23 | 苏州大学 | Air source heat pump water heater |
KR20110097203A (en) * | 2010-02-25 | 2011-08-31 | 삼성전자주식회사 | Heat pump system and control method thereof |
JP2012013356A (en) * | 2010-07-02 | 2012-01-19 | Panasonic Corp | Heat pump type hot water heating device |
CN101957067B (en) * | 2010-11-01 | 2012-09-05 | 江苏天舒电器有限公司 | Frequency conversion control method for heat pump water heater |
JP6076583B2 (en) * | 2011-01-19 | 2017-02-08 | 三菱重工業株式会社 | heat pump |
CN202452684U (en) * | 2011-10-28 | 2012-09-26 | 陕西隆科来福节能设备有限责任公司 | Air-source heat pump water heater system |
CN102818364A (en) * | 2012-08-28 | 2012-12-12 | 黄染 | Instant heat-pump water heater and control method thereof |
CN103836789B (en) * | 2012-11-22 | 2016-08-10 | 珠海格力电器股份有限公司 | Method for increasing maximum outlet water temperature of heat pump water heater |
-
2015
- 2015-05-22 CN CN201510268372.7A patent/CN104833102A/en active Pending
- 2015-07-16 EP EP15893020.6A patent/EP3299744A4/en not_active Withdrawn
- 2015-07-16 US US15/501,122 patent/US20180106483A1/en not_active Abandoned
- 2015-07-16 WO PCT/CN2015/084252 patent/WO2016187939A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9562696B2 (en) * | 2010-04-15 | 2017-02-07 | Mitsubishi Electric Corporation | Hot water supply system control apparatus and hot water supply system control program and hot water supply system operating method |
US20130312443A1 (en) * | 2011-02-14 | 2013-11-28 | Mitsubishi Electric Corporation | Refrigeration cycle apparatus and refrigeration cycle control method |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20200011569A1 (en) * | 2017-04-19 | 2020-01-09 | Mitsubishi Electric Corporation | Heat pump apparatus |
US10890355B2 (en) * | 2017-04-19 | 2021-01-12 | Mitsubishi Electric Corporation | Heat pump apparatus |
US20210199343A1 (en) * | 2019-12-30 | 2021-07-01 | Lg Electronics Inc. | Water heater controlled by frequency regulation of inverter |
CN112963897A (en) * | 2021-03-17 | 2021-06-15 | 北京华远意通热力科技股份有限公司 | Distributed variable frequency control system |
CN114704959A (en) * | 2022-03-29 | 2022-07-05 | 广东纽恩泰新能源科技发展有限公司 | Control method and device for variable-frequency heat pump water heater, electronic equipment and storage medium |
CN118289863A (en) * | 2024-06-06 | 2024-07-05 | 瑞纳智能设备股份有限公司 | Self-adaptive adjusting method for water processor, electronic equipment and water processor |
Also Published As
Publication number | Publication date |
---|---|
CN104833102A (en) | 2015-08-12 |
WO2016187939A1 (en) | 2016-12-01 |
EP3299744A1 (en) | 2018-03-28 |
EP3299744A4 (en) | 2019-01-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20180106483A1 (en) | Method and system for controlling frequency of variable-frequency compressor in heat pump water heater | |
US11293657B2 (en) | Air conditioning system and pressure ratio control method and device thereof | |
US11181956B2 (en) | Controlling fan speed of server | |
US9861014B2 (en) | Automatic control system and method of chillers for data center | |
US10359750B2 (en) | Frequency control method for micro-grid and control device | |
US9436241B2 (en) | Electronic device and method for adjusting fan of electronic device | |
WO2017071483A1 (en) | Room-level air-conditioning adjustment method and apparatus, and controller | |
CN103912990A (en) | Control method for heat-pump water heater | |
US8963465B2 (en) | Multi-pressure-quantity fan control system and computer system having the same | |
US20200141619A1 (en) | Multi-split system and method and apparatus for adjusting oil volume of compressor of multi-split system | |
EP3477214A1 (en) | Active control method and device for inverter air conditioner | |
US20210063040A1 (en) | Air-conditioning control apparatus, air-conditioning control method, and computer readable medium | |
CN113075982A (en) | Server intelligent network card heat dissipation method, device, system and medium | |
CN107045379B (en) | Cabinet server temperature control method and device | |
US20190305348A1 (en) | Method, Device and System for Controlling Fuel Cell and Rail Vehicle | |
CN105514838A (en) | Heating control method and device for converter cabinet of wind generating set | |
EP3242183B1 (en) | Method for tracking control of maximum power point of solar cell and tracking device | |
CN103558876B (en) | Cooling control method, cooling control system and the network equipment | |
CN103821746B (en) | Fan monitoring method and server system | |
CN117353651B (en) | Photovoltaic system control method, device, equipment and medium | |
US10212860B2 (en) | Adaptive automatic computer room air conditioners (CRAC) master control method and system | |
US10523015B2 (en) | Power generation apparatus, power generation system, and power generation method | |
CN108509018B (en) | Control method, electronic device and storage medium | |
KR102126158B1 (en) | multi control system with engineering space cooling function | |
CN109995087B (en) | Frequency modulation control method and device for power station and frequency modulation system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MIDEA GROUP CO., LTD., CHINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ZHANG, DENGKE;REEL/FRAME:041471/0476 Effective date: 20170217 Owner name: GD MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ZHANG, DENGKE;REEL/FRAME:041471/0476 Effective date: 20170217 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |