CN203848548U - Multipurpose air source heat pump unit - Google Patents
Multipurpose air source heat pump unit Download PDFInfo
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- CN203848548U CN203848548U CN201420269424.3U CN201420269424U CN203848548U CN 203848548 U CN203848548 U CN 203848548U CN 201420269424 U CN201420269424 U CN 201420269424U CN 203848548 U CN203848548 U CN 203848548U
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- compressor
- heat pump
- cooled condenser
- water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 78
- 238000010438 heat treatment Methods 0.000 abstract description 20
- 238000005057 refrigeration Methods 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- 239000007788 liquid Substances 0.000 description 12
- 238000009833 condensation Methods 0.000 description 11
- 230000005494 condensation Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009102 absorption Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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- Other Air-Conditioning Systems (AREA)
Abstract
The utility model provides a multipurpose air source heat pump unit. The multipurpose air source heat pump unit comprises a compressor, an air cooled condenser, a plate heat exchanger, a throttling element and a shell-tube type evaporator which are sequentially serially connected to form a closed circulation pipeline. The plate heat exchanger is serially connected to the pipeline between the compressor and the air cooled condenser. A four-way valve is disposed on the pipeline and comprise a first port, a second port, a third port and a fourth port which can be communicated with one another. The first port is connected with the outlet of the plate heat exchanger. The second port is connected with the inlet of the air cooled condenser. The third port is connected with the inlet of the shell-tube type evaporator. The fourth port is connected with the inlet of the compressor. The multipurpose air source heat pump unit has the advantages that refrigeration, heating and all-day domestic hot water supply are achieved, and high conversion efficiency is achieved.
Description
Technical field
The utility model relates to air-conditioning equipment manufacturing technology, relates in particular to the multiplex unit of a kind of air source heat pump, belongs to Thermal Power Engineering technical field.
Background technology
Heat pump techniques is the new energy technology receiving much attention in the whole world in recent years.Heat pump is with condenser liberated heat, to carry out the refrigeration system of heat supply, and it is by be called " the heat multiplier " of image.
Air source heat pump Hot water units Shortcomings part in prior art, such as wasted a large amount of colds when producing domestic hot-water; Another kind of waste heat recovery air-conditioning unit weak point in prior art, only in the situation that freezing summer, obtain free domestic water, all the other time periods adopt electrical heating or other forms of heating means to meet client's demand, the multiplex unit function singleness of most of air source heat pumps in prior art in a word, air can be under-utilized, there is within the specific limits limitation, can not meet the round-the-clock use of users domestic hot-water.
Utility model content
Technical problem to be solved in the utility model is: provide a kind of air conditioner refrigerating technology, heat pump heat technology, Condensation Heat Recovery Technology effectively integrate in one realized respectively refrigeration, heated, round-the-clock not at times provide domestic hot-water, the multiplex unit of air source heat pump that can a tractor serves several purposes.
For solving the problems of the technologies described above, the multiplex unit of air source heat pump of the present utility model, comprising: compressor, air cooled condenser, plate type heat exchanger, restricting element and shell and tube evaporator; Described compressor, described air cooled condenser, described restricting element and described shell and tube evaporator are connected successively, take and connect as a closed circulation pipeline; Described plate type heat exchanger is connected on the pipeline between described compressor and described air cooled condenser;
On described pipeline, be provided with cross valve, this cross valve comprises first interface, the second interface, the 3rd interface and the 4th interface that can be interconnected; Described first interface is connected with the outlet of described plate type heat exchanger, and described the second interface is connected with the entrance of described air cooled condenser, and described the 3rd interface is connected with the entrance of described shell and tube evaporator, and described the 4th interface is connected with the entrance of described compressor.
The multiplex unit of air source heat pump as above, wherein, is provided with magnetic valve on four interfaces of described cross valve.
The multiplex unit of air source heat pump as above, wherein, the port of export of described air cooled condenser is provided with reservoir.
The multiplex unit of air source heat pump as above, wherein, described restricting element is arranged between described reservoir and described shell and tube evaporator.
The multiplex unit of air source heat pump as above, wherein, the suction end of described compressor is provided with auxiliary compressor.
The multiplex unit of air source heat pump as above, wherein, entrance and the port of export of described reservoir are provided with check valve.
The multiplex unit of air source heat pump as above, wherein, the arrival end of described reservoir is provided with the first check valve and the 4th check valve, the port of export of described air cooled condenser is connected with described reservoir by described the first check valve, and described shell and tube evaporator arrival end is connected with described reservoir by the 4th check valve;
The port of export of described reservoir is provided with the second check valve and the 3rd check valve, the port of export of described air cooled condenser is connected with described reservoir by described the second check valve, and described shell and tube evaporator arrival end is connected with described reservoir by the 3rd check valve.
The multiplex unit of air source heat pump of the present utility model has really been realized energy-saving and environmental protection, low-carbon (LC), environmental pollution zero-emission, and when allowing user obtain result of use, operating cost and maintenance cost are lower.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the multiplex unit of the utility model embodiment air source heat pump;
Fig. 2 is the structure chart of the multiplex unit of the utility model embodiment air source heat pump;
Fig. 3 is the first running status schematic diagram of Fig. 2;
Fig. 4 is the second running status schematic diagram of Fig. 2;
Fig. 5 is the 3rd running status schematic diagram of Fig. 2;
Fig. 6 is the 4th running status schematic diagram of Fig. 2;
Fig. 7 is the 5th running status schematic diagram of Fig. 2.
The specific embodiment
Below in conjunction with accompanying drawing, describe specific embodiments of the present utility model in detail.
Fig. 1 is the schematic diagram of the multiplex unit of the utility model embodiment air source heat pump, and in conjunction with Fig. 2, the present embodiment comprises: compressor 1, air cooled condenser 2, shell and tube evaporator 4, restricting element 3 and plate type heat exchanger 5.Compressor 1, air cooled condenser 2, restricting element 3 and shell and tube evaporator 4 are connected successively, take and connect as a circulation line that annular is closed; Plate type heat exchanger 5 is connected on the pipeline between compressor 1 and air cooled condenser 2; The special pipe-line system of pipeline in the present embodiment, for connecting the entrance and exit of all parts.Be the port of export connecting plate type heat exchanger 5, air cooled condenser 2, restricting element 3 and the shell and tube evaporator 4 successively of compressor 1, the outlet of shell and tube evaporator 4 is connected with the arrival end of compressor 1.
On the pipeline of the present embodiment, be provided with cross valve 6, this cross valve 6 comprises first interface, the second interface, the 3rd interface and the 4th interface that can be interconnected; First interface is connected with the outlet of plate type heat exchanger 5, and the second interface is connected with the entrance of air cooled condenser 2, and the 3rd interface is connected with the entrance of shell and tube evaporator 4, and the 4th interface is connected with the entrance of compressor 1.
Generally, on the pipeline between the 3rd interface and the entrance of compressor 1, be also provided with gas-liquid separator 7, the suction gas of gas-liquid separator 7 for guaranteeing that the suction end of compressor 1 can be good.
In addition, as shown in Fig. 3 to Fig. 7, between the 3rd interface and the entrance of compressor 1, be also provided with auxiliary compressor 9.That is, the suction end of compressor 1 is provided with auxiliary compressor 9.Auxiliary compressor 9 is for gas is carried out to supercharging, to improve the operating efficiency of compressor 1.
On the basis of above-described embodiment, on four interfaces of cross valve 6, be provided with magnetic valve, the adjusting flowing to the gas in pipeline or liquid.
On the basis of above-described embodiment, further, the port of export of air cooled condenser 2 is provided with reservoir 8, for cooled high temperature high pressure liquid is stored.Generally, restricting element 3 is arranged between reservoir 8 and shell and tube evaporator 4.The effect of restricting element 3 is mainly throttling and decompression.Certainly, restricting element 3 (Fig. 2 to Fig. 7 does not mark restricting element) also can be arranged in shell and tube evaporator 4, makes liquid directly in shell and tube evaporator 4, carry out throttling action.Entrance and the port of export of reservoir 8 are provided with check valve.Concrete, the arrival end of reservoir 8 is provided with the first check valve 11 and the 4th check valve 14, the port of export of air cooled condenser 2 is connected with the arrival end of reservoir 8 by the first check valve 11, and shell and tube evaporator 4 arrival ends are connected with the arrival end of reservoir 8 by the 4th check valve 14; The port of export of reservoir 8 is provided with the second check valve 12 and the 3rd check valve 13, the port of export of air cooled condenser 2 is connected with the port of export of reservoir 8 by the second check valve 12, and shell and tube evaporator 4 arrival ends are connected with the port of export of reservoir 8 by the 3rd check valve 13.
The multiplex unit of air source heat pump of the present embodiment, when operation, is divided into refrigerating state, heats state and hot water preparing state.
During refrigerating state: compressor 1 compressed gaseous cold-producing medium, high temperature and high pressure gas after compression is flowed to air cooled condenser 2, heat release condensation in air cooled condenser 2, through restricting element, 3 step-downs become liquid-vapor mixture again, by shell and tube evaporator 4 heat absorptions, flash to gaseous refrigerant again, finally by compressor 1, absorbed and enter next circulation.
While heating state: compressor 1 compressed gaseous cold-producing medium, flow to shell and tube evaporator 4 (now shell and tube evaporator 4 is done condenser use), heat release condensation in shell and tube evaporator 4, through restricting element, 3 step-downs become liquid-vapor mixture, by air cooled condenser 2 (air cooled condenser 2 is made evaporimeter and used) heat absorption, flash to steam again, finally by compressor 1, absorbed and enter next circulation.
Hot water preparing state: namely on the basis of refrigerating state operation, between compressor 1 and cross valve 6, add a plate type heat exchanger 5, the heat that absorbs high temperature and high pressure gaseous refrigerant, the water by transfer of heat to plate type heat exchanger 5, makes the water of flowing through become 50 ℃ of-55 ℃ of domestic hot-waters.
The multiplex unit of air source heat pump of the present embodiment is as follows at the state of runtime system:
As Fig. 3, unit enters separate refrigeration pattern;
Now the domestic hot-water's side water route water pump on plate type heat exchanger 5 cuts out, and valve 23 is closed.Freon refrigerant becomes high temperature and high pressure steam and enters efficient plate-type heat-exchanger 5 after compressor 1 compression, through valve 22, cross valve 6 enters air cooled condenser 2, in air cooled condenser 2, heat release condensation becomes the liquid refrigerant of high normal pressure and temperature, through the first check valve 11, enter reservoir 8, after dry filter, after valve 21 and reducing pressure by regulating flow, form gas-liquid mixture again, again through the 3rd check valve 13, valve 24, flow to shell and tube evaporator 4, in shell and tube evaporator 4, cold-producing medium is drawn the heat explosive evaporation of air conditioner water, through cross valve 6, enter gas-liquid separator 7, by compressor 1, absorbed and enter next kind of refrigeration cycle.The air conditioner water temperature of being absorbed heat is reduced under the effect of water circulating pump and enters air conditioner end equipment, air carries out after cold and hot exchange with low-temperature air conditioner water, air conditioner water temperature raises and enters shell and tube evaporator 4 recirculation, the air of processed cooling is sent into indoor under the effect of blower fan, has reached the effect of refrigeration.
As Fig. 4, in the time of refrigeration, provide domestic hot-water;
On the basis of separate refrigeration, now domestic hot-water's side water route water pump is opened, and the high-temperature high-pressure refrigerant after compression is through efficient plate-type heat-exchanger 5, condensation heat release in efficient plate-type heat-exchanger 5, transfer heat to the water in the plate type heat exchanger 5 of flowing through, water is heated and becomes domestic hot-water.After hot water temperature reaches, the cold-producing medium that contains waste heat enters air cooled condenser 2 and carries out heat release through valve 22, cross valve 6 again.So not only play refrigeration and also produced domestic hot-water.
As Fig. 5, unit is transformed into independent heating mode;
Now domestic hot-water's side water route water pump cuts out, and valve 23 is closed, and cross valve 6 starts to change refrigerant flow direction.Freon refrigerant becomes high temperature and high pressure gaseous refrigerant through plate type heat exchanger 5 after compressor 1 compression, valve 22, cross valve 6 enters shell and tube evaporator 4 (shell and tube evaporator 4 is when condenser use), heat release condensation in shell and tube evaporator 4, heat in cold-producing medium is passed to air conditioner water, thereby cold-producing medium becomes the refrigerant liquid of high normal pressure and temperature, through valve 24, the 4th check valve 14 enters reservoir 8, after dry filter, after valve 2 reducing pressure by regulating flow, form liquid-vapor mixture, again through the second check valve 12, flow to air cooled condenser 2, in air cooled condenser 2 (air cooled condenser 2 is made evaporimeter and used), draw airborne heat explosive evaporation, through cross valve 6, enter gas-liquid separator 7, finally by compressor 1, absorbed and enter next circulation.The air conditioner water temperature that is passed heat raises, under the effect of water circulating pump, enter air conditioner end equipment, cold air carries out after cold and hot exchange with air conditioner water, air conditioner water cooling enters shell and tube evaporator 4 recirculation, the air of processed intensification is sent into indoor under the effect of blower fan, has reached the effect of indoor heating.
As Fig. 6, unit is transformed into independent heating mode and domestic hot-water is provided simultaneously;
On the basis heating separately, now domestic hot-water's side water route water pump is opened, and the high-temperature high-pressure refrigerant after compression is through efficient plate-type heat-exchanger 5, condensation heat release in efficient plate-type heat-exchanger 5, transfer heat to the water in the plate type heat exchanger 5 of flowing through, water is heated and becomes domestic hot-water.Then, cold-producing medium enters shell and tube evaporator 4 (when condenser uses) through valve 22, cross valve 6, and in shell and tube evaporator, heat release condensation, passes to air conditioner water heat.Domestic hot-water's object is provided when heating to realize, and this pattern is general to be used in the winter time.
It should be noted that in addition, wherein work as using amount of hot water and heating consumption in section running at full capacity in rush hour situation, both must lose one, reach domestic hot-water's temperature, heating effect does not reach, and reaches heating effect, domestic hot-water's temperature does not reach, and occurs the situation that both can not take into account.In the unit of the present embodiment, be provided with auxiliary compressor 9, can meet that different time sections is round-the-clock to be provided at full capacity domestic hot-water and heat heating.When air-conditioning side water temperature does not reach preset temperature, auxiliary compressor starts, and the former loop that heats communicates, and increases heating capacity, has played and has produced Living Water and heat both effects of taking into account of heating.In unit, set up auxiliary compressor, can in the situation that compressor 1 occurs damaging maintain and replace, still form an intact air-conditioning system, do not delay user's round-the-clock use throughout the year.Solved the irrealizable object that heats at full capacity in prior art.
As Fig. 7, unit is switched to single water heating pattern;
Now domestic hot-water's side water route water pump is opened, and valve 23 is opened, and valve 24, valve 22 and auxiliary compressor 9 are all closed, and cross valve 6 starts, conversion refrigerant flow direction.Freon refrigerant becomes high temperature and high pressure steam and enters plate type heat exchanger 5 after compressor 1 compression, through condensation heat release in plate type heat exchanger 5, transfers heat to the water of flowing through in plate type heat exchanger 5, and water is heated and becomes domestic hot-water.Heat release condensation becomes high-temperature pressure liquid refrigerant through valve 23, enter reservoir 8, after dry filter again through valve 21, form the liquid-vapor mixture after reducing pressure by regulating flow, finally by crossing the second check valve 12, flow to air-cooled condenser 2, in air-cooled condenser 2, draw airborne heat explosive evaporation, through cross valve 6, enter gas-liquid separator 7, by compressor 1, absorbed and enter next circulation.The coolant-temperature gage that is passed the plate type heat exchanger 5 of flowing through raises and becomes domestic hot-water, is transported to the place that need to use hot water, has reached the effect of independent water heating.
Unit of the present utility model has following technique effect:
1, unit a tractor serves several purposes of the present utility model, throughout the year round-the-clock regardless of time section produce domestic hot-water; Domestic hot-water's water temperature can be to 50 ℃-60 ℃; Under refrigeration standard condition, air conditioner water is: intake 7 ℃ of 12 ℃, water outlet; Heating air conditioner water under standard condition is: intake 45 ℃ of 40 ℃, water outlet;
2, the utilization rate of maximized raising air energy and electric energy, use freon environmental protection refrigerant to realize refrigeration, heat, domestic hot-water three is provided large effect, and the in the situation that of refrigeration, provide free domestic hot-water, simultaneously than traditional coal fired boiler, gas fired-boiler, oil burning boiler, electric heating hot water operation and maintenance cost is lower, energy loss-rate is higher, and low-carbon environment-friendly is pollution-free;
3, for warm, produce domestic hot-water simultaneously in the winter time, according to interior chamber heating temperature and using amount of hot water, automatically regulate proportionate relationship between them, meet the demand of user heating and hot water; Unit arranges auxiliary compressor, and rush hour in winter, section heated when producing domestic hot-water for warming up at full capacity, and both take into account, and do not affect client and use simultaneously; In the situation that main compressor damages repair and replacement, do not affect client's round-the-clock use throughout the year.
4, collection group is provided with air-cooled condensation mode, has saved the cooling tower in traditional air-conditioning system, cooling water pump and air pipe, hot water preparing equipment has more been saved in domestic hot-water aspect, and simplicity of design is easy for installation, be applicable to outdoor placement, separately refrigerator machine room.
Unit of the present utility model is specially adapted to hotel, bath center, leisure club, hospital, school etc., freeze, heat, provide domestic hot-water, than traditional coal fired boiler, gas fired-boiler, oil burning boiler, electric heating hot water operation and maintenance cost is lower, safe and reliable, and low-carbon environment-friendly is pollution-free.
Finally it should be noted that: each embodiment, only in order to the technical solution of the utility model to be described, is not intended to limit above; Although the utility model is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (7)
1. the multiplex unit of air source heat pump, is characterized in that, comprising: compressor, air cooled condenser, plate type heat exchanger, restricting element and shell and tube evaporator; Described compressor, described air cooled condenser, described restricting element and described shell and tube evaporator are connected successively, take and connect as a closed circulation pipeline; Described plate type heat exchanger is connected on the pipeline between described compressor and described air cooled condenser;
On described pipeline, be provided with cross valve, this cross valve comprises first interface, the second interface, the 3rd interface and the 4th interface that can be interconnected; Described first interface is connected with the outlet of described plate type heat exchanger, and described the second interface is connected with the entrance of described air cooled condenser, and described the 3rd interface is connected with the entrance of described shell and tube evaporator, and described the 4th interface is connected with the entrance of described compressor.
2. the multiplex unit of air source heat pump according to claim 1, is characterized in that, on four interfaces of described cross valve, is provided with magnetic valve.
3. the multiplex unit of air source heat pump according to claim 1, is characterized in that, the port of export of described air cooled condenser is provided with reservoir.
4. the multiplex unit of air source heat pump according to claim 3, is characterized in that, described restricting element is arranged between described reservoir and described shell and tube evaporator.
5. the multiplex unit of air source heat pump according to claim 1, is characterized in that, the suction end of described compressor is provided with auxiliary compressor.
6. the multiplex unit of air source heat pump according to claim 3, is characterized in that, entrance and the port of export of described reservoir are provided with check valve.
7. the multiplex unit of air source heat pump according to claim 6, it is characterized in that, the arrival end of described reservoir is provided with the first check valve and the 4th check valve, the port of export of described air cooled condenser is connected with described reservoir by described the first check valve, and described shell and tube evaporator arrival end is connected with described reservoir by the 4th check valve;
The port of export of described reservoir is provided with the second check valve and the 3rd check valve, the port of export of described air cooled condenser is connected with described reservoir by described the second check valve, and described shell and tube evaporator arrival end is connected with described reservoir by the 3rd check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420269424.3U CN203848548U (en) | 2014-05-26 | 2014-05-26 | Multipurpose air source heat pump unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420269424.3U CN203848548U (en) | 2014-05-26 | 2014-05-26 | Multipurpose air source heat pump unit |
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| CN203848548U true CN203848548U (en) | 2014-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420269424.3U Expired - Fee Related CN203848548U (en) | 2014-05-26 | 2014-05-26 | Multipurpose air source heat pump unit |
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| CN (1) | CN203848548U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105402925A (en) * | 2015-12-15 | 2016-03-16 | 江苏朗肯空气空调有限公司 | Low-loop-temperature liquid spraying type air source triple co-generation unit |
| CN108302840A (en) * | 2018-03-22 | 2018-07-20 | 杭州河源空调有限公司 | High-efficiency falling film type organic whole of double source heat pump unit |
| CN111256194A (en) * | 2019-12-13 | 2020-06-09 | 宁夏塞上阳光太阳能有限公司 | Cold and hot dual-purpose integral type heat pump cooling and heating machine |
-
2014
- 2014-05-26 CN CN201420269424.3U patent/CN203848548U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105402925A (en) * | 2015-12-15 | 2016-03-16 | 江苏朗肯空气空调有限公司 | Low-loop-temperature liquid spraying type air source triple co-generation unit |
| CN108302840A (en) * | 2018-03-22 | 2018-07-20 | 杭州河源空调有限公司 | High-efficiency falling film type organic whole of double source heat pump unit |
| CN111256194A (en) * | 2019-12-13 | 2020-06-09 | 宁夏塞上阳光太阳能有限公司 | Cold and hot dual-purpose integral type heat pump cooling and heating machine |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20180526 |
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| CF01 | Termination of patent right due to non-payment of annual fee |