Specific embodiment
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Practice them.Other embodiments may include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual components and functionality is optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The range of bright embodiment includes equivalent obtained by the entire scope of claims and all of claims
Object.Herein, each embodiment individually or can be indicated generally with term " invention ", and it is convenient that this is used for the purpose of,
And if in fact disclosing the invention more than one, the range for being not meant to automatically limit the application is any single invention
Or inventive concept.Herein, relational terms such as first and second and the like be used only for by an entity or operation with
Another entity or operation distinguish, and without requiring or implying, there are any actual relationships between these entities or operation
Or sequence.Moreover, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, thus
So that process, method or equipment including a series of elements not only include those elements, but also including being not explicitly listed
Other element, or further include for this process, method or the intrinsic element of equipment.In the feelings not limited more
Under condition, the element that is limited by sentence "including a ...", it is not excluded that in process, method or equipment including the element
In there is also other identical elements.Each embodiment herein is described in a progressive manner, and each embodiment stresses
Be the difference from other embodiments, the same or similar parts in each embodiment may refer to each other.For implementing
For method, product etc. disclosed in example, since it is corresponding with method part disclosed in embodiment, so the comparison of description is simple
Single, reference may be made to the description of the method.
Fig. 1 is a kind of structural schematic diagram at energy stores station shown according to an exemplary embodiment.As shown in Figure 1, this
The energy stores station for inventing a kind of embodiment provides a kind of energy stores station, comprising: heat storage device 3 or cooling capacity are deposited
Storage device 13, or, including heat storage device 3 and cooling capacity storage device 13;Further include: middle heat exchanger 2, medium distributive mixing
Device 5 and terminal heat exchanger 4;Wherein, the input terminal of the heat storage device 3 passes through corresponding middle heat exchanger 2 and heat release
Equipment 1 is of coupled connections, and output end connects the input terminal of terminal heat exchanger 4, and the terminal heat exchanger 4 distributes mixed through the medium
It attaches together and sets 5 and be of coupled connections with heating equipment 6;The input terminal of the cooling capacity storage device 13 by heat exchanger 2 in corresponding with
Heat sink 12 is of coupled connections;The input terminal of the output end connection terminal heat exchanger 4 of the cooling capacity storage device 13, the terminal
Heat exchanger 4 is of coupled connections through the medium distributive mixing device 5 with refrigeration equipment 14;Wherein, the medium distributive mixing device 5
It is connect with two or more terminal heat exchangers 4;The refrigeration equipment 14 is air conditioner or refrigerator.
There are two ports for heat storage device tool, are connected respectively with external equipment, are thermal input 8 and heat respectively
Energy output end 9, thermal input 8 connect external heating equipment, carry out heat supply to heat storage sites.Pass through heat energy output end 9
The equipment for connecting outside need heat, the heat of heat storage sites is exported, and carries out heat supply to other equipment.
Cooling capacity storage station structure is similar to heat storage sites, using the material of storage cooling capacity.Chemistry side can equally be used
Formula storage, is such as converted to solid-state for liquid and stores.Cooling capacity is stored using a kind of material.The external tool of storage material
There is thermal insulation material, the diffusion of heat can be effectively prevent, can effectively keep heat (cooling capacity).
The connection type of equipment and heat or cooling capacity storage sites passes through two piping connections, intake line and output respectively
The connector of pipeline, intake line and output pipe has controlled valve, the control switched according to need of work.
Such as, heat storage sites, intake line input the medium of high temperature, by the thermal input of heat storage sites, into
Heat is imported heat storage sites by row heat exchange, and the medium after then cooling down is flowed back to equipment again by output pipe.
In above scheme, middle heat exchanger 2 carries out the transmission of heat by the medium in it, and middle heat exchanger 2 has two
End, that is, couple unconnected two circuits, the medium in input circuit by heat-releasing apparatus 1 such as refrigerator heat-dissipating casing at heat
Collect, when by heat-absorbing material in it, absorb the heat of the medium in input circuit, then with another circuit, that is, output loop
It couples, heat is taken to the flowing of medium and be conducted to heat by the heat that the medium in output loop absorbs in heat-absorbing material
Storage device 3 is measured, the accumulation of heat module 11 constituted in heat storage device 3 with heat-absorbing material stores heat, then from heat
Amount storage device 3 is transmitted to through terminal heat exchanger 4 needs the heating equipment 6 that absorbs heat, such as water heater, heating installation, heat preservation are cooked
It prepares food utensil etc.;Input circuit and output loop are coupled by the heat-absorbing material of middle heat exchanger 2, allow heat never equality of temperature
Heat storage device 3 is arrived in the storage of heat-releasing apparatus 1 of degree, is not in the temperature when heat-releasing apparatus 1 lower than heat storage device 3,
The case where heat reverse flow;Terminal heat exchanger 4 is identical as the structure of middle heat exchanger 2, is mounted on heat storage device 3
Heat energy output end 9 is connect through medium distributive mixing device 5 with two or more heating equipments 6 or refrigeration equipment 14, often
The input terminal of a medium distributive mixing device 5 connects two or more terminal heat exchangers 4, each terminal heat exchanger 4
The temperature of output end is different, and it is mixed that medium distribution is adjusted in the ratio of the medium of the terminal heat exchanger 4 by controlling different temperatures
Attach together set 5 temperature, to adjust the temperature of medium distributive mixing device 5, to adjust heating equipment 6 or refrigeration equipment 14
Temperature.
Air conditioner, for the different equipment such as refrigerator due to the difference of equipment, heat exchange amount is different, the medium temp exported from equipment
Also different.Meanwhile when generally carrying out heat transmitting, the low one end of temperature can only be transmitted to from the high one end of temperature, if heat stores
Temperature itself in device 3 is higher than the medium temp of equipment output, and at this point, heat storage device 3 is deposited there are many more heating load
The capacity of storage to the temperature storage of heat storage device 3, can not then will cause instead the heat stream of heat storage device 3 at this time
It loses, plays opposite effect.When heat storage device 3 carries out heat release, and identical problem can be encountered.Therefore one is needed
Heat exchanger 2 in kind, to from equipment guiding 3/ cooling capacity storage device 13 of heat storage device medium temp, and from heat/
The medium temp of 13 guide device of cooling capacity storage device is adjusted, and can normally carry out heat transfer.
Fig. 2 is terminal heat exchanger and medium distributive mixing device attachment structure schematic diagram, as shown in Fig. 2, middle heat exchanger 2
There are two ends, respectively heat absorption end and heat release end for tool.Respectively there are two pipelines at both ends, are separately connected heat storage device
3 or cooling capacity storage device 13 and heat-releasing apparatus 1 or heat sink 12.
The heat exchanger apparatus of heat exchanger apparatus and heat release in middle heat exchanger 2 with heat absorption, such as evaporator
Deng.
Inside it, both ends are connected with the medium that can carry out liquid, gaseous state conversion.The port of each piping connection has
Controlled valve 10 can control its opening and closing, can control opening size, to control uninterrupted.When being exchanged heat,
The controlled valve 10 for opening respective line, can carry out heat exchange work.When not needing work, controlled valve 10 is closed,
Stop heat transfer.
When carrying out equipment and working the accumulation of heat of heat storage device 3, the medium at heat absorption end is from liquid in middle heat exchanger 2
State becomes gaseous state, absorbs the heat of heat input pipeline, and the medium temp for connecting the output pipe of equipment can then reduce.Middle conversion
After medium in hot device 2 reaches heat release end, medium becomes liquid from gaseous state, discharges heat, heat storage device 3 is reached
The medium of the intake line of middle heat exchanger 2 is heated, and after temperature increases, is flowed back to heat storage device 3, middle heat exchanger
The intake line of 2 output pipe i.e. heat storage device 3 at this time rejects heat to after reaching heat storage device 3
In heat storage device 3, the medium after reducing temperature then continues through heat exchanger 2 in its output pipe flow direction.Therefore, pass through
Middle heat exchanger 2 is constantly realized and is absorbed heat from equipment end pipeline, carries out heat release heating to the pipeline medium of heat storage end,
Realize the transmitting of heat.Even if the temperature of exothermic equipment release lower than the temperature in heat storage device 3, also can be into
The transmitting of row heat.
The work of middle heat exchanger 2 be equally applicable to heat storage device 3 equipment is heated or cooling capacity storage dress
13 absorption cooling capacity are set, the work of released cold quantity is used as terminal heat exchanger 4.
Middle heat exchanger 2 may be used also other than realizing heat transfer using this liquid gaseous state conversion by internal media
To carry out the transmitting of both ends heat by other means.
In above scheme, wherein the heating equipment 6 is at least one of following: humidifier, heating installation and heat
Hydrophone.
In above scheme, the terminal heat exchanger 4 is connect with two or more medium distributive mixing devices 5.
In above scheme, further includes: heat absorption valve is arranged in the terminal connecting with the cooling capacity storage device 13 and changes
On the output end of hot device 4.
In above scheme, further includes: control device is used for: receiving the refrigeration equipment 14 or the instruction of user;And
The stream that terminal heat exchanger 4 enters the medium of medium distributive mixing device 5 is adjusted according to the instruction of the refrigeration equipment 14 or user
Amount.
Fig. 3 is terminal heat exchanger and medium distributive mixing device attachment structure schematic diagram.
Fig. 4 is a kind of structural schematic diagram for energy stores station shown according to an exemplary embodiment.Such as Fig. 4 institute
Show, the control method for energy stores station of one embodiment of the present invention, the energy stores station includes: heat storage dress
3 and cooling capacity storage device 13, heat storage device 3 or cooling capacity storage device 13 are set, or, including heat storage device 3 and cooling capacity
Storage device 13;Further include: middle heat exchanger 2, medium distributive mixing device 5 and terminal heat exchanger 4;Wherein, the heat is deposited
The input terminal of storage device 3 is of coupled connections by corresponding middle heat exchanger 2 with heat-releasing apparatus 1, and output end connects terminal heat exchange
The input terminal of device 4, the terminal heat exchanger 4 are of coupled connections through the medium distributive mixing device 5 with heating equipment 6;It is described cold
The input terminal of amount storage device 13 is of coupled connections by corresponding middle heat exchanger 2 with heat sink 12;The cooling capacity storage dress
Set the input terminal of 13 output end connection terminal heat exchanger 4, the terminal heat exchanger 4 through the medium distributive mixing device 5 with
Refrigeration equipment 14 is of coupled connections;Wherein, the medium distributive mixing device 5 connects with two or more terminal heat exchangers 4
It connects;The refrigeration equipment 14 is air conditioner or refrigerator;This method comprises: receiving the refrigeration equipment 14 or the instruction of user;With
And the medium of medium distributive mixing device 5 is entered according to the instruction adjusting terminal heat exchanger 4 of the refrigeration equipment 14 or user
Flow.
In above scheme, control device receives user instruction by reception device such as key, pronunciation receiver etc., uses
It include the control instruction to refrigeration equipment 14 in the instruction of family, such as switching on and shutting down, temperature are adjusted;Control device is adjusted according to user instructions
The flow that terminal heat exchanger 4 enters the medium of medium distributive mixing device 5 is saved, to adjust the operation of refrigeration equipment 14.
In above scheme, wherein the refrigeration equipment 14 or the instruction of user of receiving includes: in step s 110, to receive
The refrigeration instruction of refrigeration equipment or user include target temperature in the refrigeration instruction.
When the instruction for receiving refrigeration equipment, according to target temperature wherein included, two or more terminals are adjusted
Heat exchanger enters the flow of medium distributive mixing device, and each terminal heat exchanger is configured as different temperature, such as passes through control
Flow/flow velocity of system and the medium of cooling capacity storage device adjusts heat exchange amount to adjust the temperature of terminal heat exchanger.
It is described that medium distribution is entered according to the instruction of the refrigeration equipment or user adjusting terminal heat exchanger in above scheme
The flow of the medium of mixing arrangement includes: the aperture that each heat absorption valve is adjusted according to the target temperature.
In above scheme, the two or more terminal heat exchangers connecting with medium distributive mixing device are adjusted to
Different temperature calculates the ratio of the terminal heat exchanger of each different temperatures according to target temperature, to adjust each heat absorption valve
The aperture of door, so that the medium mixing in the terminal heat exchanger of different temperatures reaches the target temperature of refrigeration equipment.For two
Or same system pair can be used in the energy stores station of more than two refrigeration equipments, the medium distributive mixing scheme of above scheme
The refrigeration equipment of multiple and different temperature requirements is energized, and is simplified system, is improved the applicability and flexibility of system.
In above scheme, refrigeration equipment can be refrigerator, refrigerator, soda fountain, air conditioner in refrigeration mode etc., heat release
Equipment can be compressor/shell of refrigerator and cartridge element/structure of other household electrical appliance such as kitchen ventilator etc..
In above scheme, wherein the instruction for receiving the refrigeration equipment includes: to obtain user in step S1102
Image or ambient image;In step S1104, the user images or ambient image are analyzed, it is true based on historical data
The target temperature of fixed and user or environmental correclation connection.
In above scheme, the instruction for receiving refrigeration equipment can receive user by switch button, user's touch key-press etc.
Instruction can also be identified according to the previous use habit combination user images of user and be obtained, such as being identified according to user images will
Operation/control instruction of user is associated, operation mode corresponding with user images is generated, when pattern recognition device recognizes use
When the image of family, the temperature of refrigeration equipment is controlled according to matched operation mode.For example, when receive air conditioner in the environment
Image when progress image recognition determines that user is AA, obtains user AA in historical data and grasps to the temperature of the remote controler of air conditioner
Make, determines history target temperature, target temperature is determined according to the use habit of user, adjusts the temperature of air conditioner, such as user
The target temperature of AA historical operation is 22 DEG C, adjusts each terminal heat exchanger connecting with the air conditioner according to the target temperature
The aperture of heat absorption valve;When connecting with medium distributive mixing device 5, there are two terminal heat exchanger, the temperature of two terminal heat exchangers
Respectively 20 DEG C and 24 DEG C, then by two terminal heat exchangers 4 according to 1;1 is mixed and can reach 22 DEG C;Wherein, first terminal
The temperature of heat exchanger is T1, and the temperature of second terminal heat exchanger 4 is T2, and required target temperature is TX, calculates two terminal heat exchange
4 first terminal heat exchanger of device and second terminal heat exchanger heat release valve or absorb heat valve switch ratio formula are as follows:
(TX-T2): (T1-TX).
In above scheme, wherein the medium distributive mixing device is connect with two or more terminal heat exchangers;
The heating equipment is at least one of following: humidifier, heating installation, temperature controlled bed and water heater etc..
The control method for energy stores station of another embodiment of the present invention, the energy stores station further include:
Heat storage device 3;Further include: middle heat exchanger 2, medium distributive mixing device 5 and terminal heat exchanger 4;Wherein, the heat
The input terminal of storage device 3 is of coupled connections by corresponding middle heat exchanger 2 with heat-releasing apparatus 1, and output end connection terminal is changed
The input terminal of hot device 4, the terminal heat exchanger 4 through the medium distributive mixing device 5 and heating equipment 6 such as humidifier, take
At least one of heater device and water heater are of coupled connections;Wherein, the medium distributive mixing device 5 and two or more
Terminal heat exchanger 4 connect;This method comprises: in step s 110, receiving the heating equipment 6 or the instruction of user;And
In the step s 120, terminal heat exchanger is adjusted according to the instruction of the heating equipment 6 or user and enters medium distributive mixing device
Medium flow.
In above scheme, control device receives user instruction by reception device such as key, pronunciation receiver etc., uses
It include the control instruction to heating equipment in the instruction of family, such as switching on and shutting down, temperature are adjusted;Control device is adjusted according to user instructions
Terminal heat exchanger enters the flow of the medium of medium distributive mixing device 5, to adjust the operation of heating equipment.
In above scheme, wherein the heating equipment or the instruction of user of receiving includes: to receive heating equipment or user
Refrigeration instruction includes target temperature in heating instruction.
When the instruction for receiving heating equipment, according to target temperature wherein included, two or more terminals are adjusted
Heat exchanger enters the flow of medium distributive mixing device, and each terminal heat exchanger 4 is configured as different temperature, such as passes through control
Flow/flow velocity of system and the medium of cooling capacity storage device adjusts heat exchange amount to adjust the temperature of terminal heat exchanger.
It is described that medium distribution is entered according to the instruction of the heating equipment or user adjusting terminal heat exchanger in above scheme
The flow of the medium of mixing arrangement includes: the aperture that each heat release valve is adjusted according to the target temperature.
In above scheme, the two or more terminal heat exchangers connecting with medium distributive mixing device are adjusted to
Different temperature calculates the ratio of the terminal heat exchanger of each different temperatures according to target temperature, to adjust each heat release valve
The aperture of door, so that the medium mixing in the terminal heat exchanger of different temperatures reaches the target temperature of heating equipment.For two
Or same system pair can be used in the energy stores station of more than two heating equipments, the medium distributive mixing scheme of above scheme
The heating equipment of multiple and different temperature requirements is energized, and is simplified system, is improved the applicability and flexibility of system.
In above scheme, heat-releasing apparatus can also be solar energy heat collector or the release end of heat of heating installation or charging unit
Deng.
In upper scheme, the heat-releasing apparatus of the input terminal of heat storage device can be one kind/platform or two kinds/platform or more,
System for the energy stores station being made of multiple heat-releasing apparatus 1, heat storage device 3 and heat sink 12, can control
A/kind heat-releasing apparatus 1 is formed to the corresponding relationship of two or more heat sink 12, also may be constructed two or two
The above heat-releasing apparatus 1 realizes that a variety of flowings of energy are closed to the system of the corresponding relationship of two or more heat sink 12
The energy negotiability at energy storage station improves in system, improves system availability.
Such as the corresponding relationship of a refrigerator and two or more water heaters can be formed, the heat that a refrigerator is released
It measures and is energized to multiple water heaters;It can also be closed for two or more refrigerators are corresponding with two or more water heaters
System;Alternatively, a kitchen ventilator with or more than two water heater it is corresponding, two or more kitchen ventilators and two or two with
Upper water heater is corresponding;Or, a refrigerator and two or more temperature controlled bed corresponding relationships, the heat that a refrigerator is released
To multiple temperature controlled bed energy supplies;It can also be two or more refrigerators and two or more temperature controlled bed corresponding relationships;
Or, the corresponding relationship of a solar energy heat collector/heating installation and two or more water heaters, a solar energy heating
The heat that device/heating installation is released is energized to multiple water heaters;Can also for two or more solar energy heat collectors/
The corresponding relationship of heating installation and two or more water heaters.
The energy stores station of above scheme may be mounted in single family, can also be as unit of community/cell to each
The energy of a family is managed collectively and is deployed.
In above scheme, heat storage device 3 and/or cooling capacity storage device 13 in each family pass through respectively in transition heat
Device 2 connects heat storage pool and/or cooling capacity storage pool, the heat and/or cooling capacity of each family are input to the thermal energy storage of concentration
It is stored in pond 15, needs the family of heat and/or cooling capacity to supply into this community and other communities, realize the system of the energy
One allotment, improves energy utilization rate.
The energy storage station of exemplary embodiment of the present further include: temperature difference electricity generation device 16, setting are stored in heat and filled
It sets between 3 and cooling capacity storage device 13, generates electric current using the temperature difference at both ends, externally charge;Such as it can be to household
Electric appliance charging or the charging of electric power storage station 17 carry out energy storage.
In above scheme, the heat and cooling capacity that heat storage device 3 and cooling capacity storage device 13 may store are limited, have
When, after heat/cold storage device 13 stores full heat/cold, after needing to discharge heat/cold, it can just continue work
Make, and if directly discharged, cause the waste of the energy.It can use this portion of energy to generate electricity, be transformed into electric energy,
It is further continued for utilizing, energy-saving and emission-reduction.
As shown, setting temperature difference electricity generation device 16, optional semiconductor temperature differential power generating sheet, the hot end of semiconductor and cold end point
It is not connect with heat storage device 3 and cooling capacity storage device 13, centre can connect middle heat exchanger 2 and carry out temperature adjusting.
The electric quantity output end of temperature difference electricity generation device 16 connects electrical equipment, can connect voltage regulating device between the two,
16 electricity of temperature difference electricity generation device is changed into voltage required for electrical equipment or direct current and becomes exchange, carried out for it using.
When electrical equipment needs electricity consumption, temperature difference electricity generation device 16 works, and opens heat/cold storage device 13 and middle heat exchanger 2
Controlled valve 10, carry out heat and cooling capacity release, so that power generator both ends is formed the stable temperature difference, generate electricity.And pass through
Voltage regulator module realizes voltage transformation, and supply electrical equipment carries out electricity consumption.
The work of temperature-difference power generation module can generate electricity according to equipment use demand, at this point, institute's generated energy directly provides
To equipment.But often heat/cold storage device 13 is when carrying out heat/cold release and the use of equipment might not
Time match is also required to temperature-difference power generation module at this time and generates electricity.Moreover, sometimes, electrical equipment institute's electricity demand and thermo-electric generation
Module institute generated energy also mismatches, for example generated energy is greater than electricity consumption, at this point, electricity is caused to waste;And generated energy is lower than electricity consumption
Amount, then equipment can not work normally, it is therefore desirable to a kind of electric energy storage device.
Electric power storage station 17 of the invention connects temperature difference electricity generation device 16, voltage regulator module and electrical equipment, and other
Power generator.16 generated energy of temperature difference electricity generation device can charge after voltage regulator module to electric power storage station 17, other
Power generator such as mechanical energy power generator, treadmill etc. can equally charge for electric power storage station 17.The output end at electric power storage station 17
Equally there is voltage regulator module, voltage is adjusted to voltage needed for electrical equipment.
Working method 1: 16 generated energy of temperature difference electricity generation device pass to electric power storage station 17 by voltage regulator module, by electric power storage
It stands and 17 stores electricity, when electrical equipment needs electricity consumption, electricity output is directly carried out by electric power storage station 17.
Working method 2: when temperature difference electricity generation device 16 is powered directly to electrical equipment, if institute's generated energy is greater than electricity consumption
Amount, then the electricity of power generator is divided into two-way, is powered all the way directly to equipment, and another part charges to electric power storage station 17
Storage.
Working method 3: when generated energy is less than electricity consumption, working method 1 can be used, is directly supplied using electric power storage station 17
Electricity, temperature difference electricity generation device 16 charge to electric power storage station 17 simultaneously.It can also be by temperature difference electricity generation device 16 and electric power storage station 17 simultaneously
It is powered to electrical equipment, the two electricity is integrated, supply electrical equipment.
The energy stores station of exemplary embodiment of the present further includes dynamoelectric and power generation system, dynamoelectric and power generation system and running
Machine etc. has the household electrical appliance connection of kinetic energy output, and dynamoelectric and power generation system includes motor, motor and sports apparatus as run
The mechanical movement axis of machine, bicycle, dumbbell etc. is of coupled connections, and treadmill drives generator operation, and mechanical energy is converted to electric energy and deposits
Storage is in electric power storage station 17.
It will be appreciated by those of skill in the art that unit described in conjunction with the examples disclosed in the embodiments of the present disclosure and
Algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually with hard
Part or software mode execute, the specific application and design constraint depending on technical solution.Those of skill in the art can be with
Each specific application is used different methods to achieve the described function, but this realization is it is not considered that exceed this hair
Bright range.It is apparent to those skilled in the art that for convenience and simplicity of description, foregoing description is
The specific work process of system, device and unit, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In embodiments disclosed herein, it should be understood that disclosed method, product (including but not limited to device, equipment etc.), it can
To realize by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
Division, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or group
Part can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown
Or the mutual correspondence discussed or directly corresponding or communication connection can be through some interfaces, device or unit it is indirect
Corresponding or communication connection can be electrical property, mechanical or other forms.The unit as illustrated by the separation member can be or
Person, which may not be, to be physically separated, and component shown as a unit may or may not be physical unit
With in one place, or may be distributed over multiple network units.Portion therein can be selected according to the actual needs
Point or whole unit achieve the purpose of the solution of this embodiment.In addition, each functional unit in each embodiment of the present invention
It can integrate in one processing unit, be also possible to each unit and physically exist alone, it can also be with two or more lists
Member is integrated in one unit.