CN213687345U - Evaporative cold screw cold and hot water unit with total heat recovery - Google Patents

Evaporative cold screw cold and hot water unit with total heat recovery Download PDF

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Publication number
CN213687345U
CN213687345U CN202022096800.1U CN202022096800U CN213687345U CN 213687345 U CN213687345 U CN 213687345U CN 202022096800 U CN202022096800 U CN 202022096800U CN 213687345 U CN213687345 U CN 213687345U
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valve
heat exchanger
total heat
hot water
cold
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章立标
韩伟达
唐进军
金成召
孙春霞
梁书成
经武辉
严冬君
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Zhejiang King Co ltd
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Zhejiang King Co ltd
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Abstract

The utility model discloses a take evaporation cold screw rod hot and cold water unit of total heat recovery, including screw compressor, oil separator, cross valve and, evaporative condenser, motorised valve, reservoir, drier-filter, solenoid valve, choke valve, air conditioner water side heat exchanger, vapour and liquid separator, check valve, total heat recovery ware, the fin heat exchanger of connection in the refrigeration cycle return circuit. The utility model can realize the switching among four functions of refrigeration, heating, refrigeration + total heat recovery and hot water and the operation modes by controlling the on-off state of the electric valve and the electromagnetic valve; meanwhile, the unit can realize the independent defrosting function of the fin heat exchanger component by controlling the on-off of the four-way valve. And the requirements of refrigeration, heating, sanitation or process hot water of conventional building or industrial projects all the year round are met through the total heat recoverer, the purposes of waste heat recovery, multiple purposes of one machine, environmental protection and energy conservation are achieved, the operating cost is effectively saved, and the equipment investment cost is reduced.

Description

Evaporative cold screw cold and hot water unit with total heat recovery
Technical Field
The utility model belongs to the technical field of heat pump machinery, especially, relate to an evaporation cold screw rod hot and cold water unit of full heat recovery in area.
Background
Conventional central air conditioning systems generally employ two approaches:
(1) water-cooled chiller
When the system is used for refrigerating, a water-cooling water chilling unit provides chilled water of 7 ℃ to the tail end of an air conditioner such as a fan coil to cool air in a room, a water-cooling condenser transfers condensation heat to cooling water, and the cooling water is pumped to a cooling tower by a cooling water pump to discharge the condensation heat to outdoor atmosphere. Therefore, the water cooling system is additionally provided with a cooling water intermediate heat exchange link, the condensation temperature of the unit is high, and a high-power water pump is needed to drive cooling water to circulate, so that the system is low in energy efficiency and high in power consumption.
In order to meet the requirements of heating in winter and transition seasons, a water-cooling cold water system needs to be additionally provided with heating equipment such as a boiler and the like, so that the energy efficiency is low, the pollution is large, and the operation and maintenance are complex;
(2) air-cooled cold and hot water unit
When refrigerating in summer, the air-cooled cold and hot water unit discharges a large amount of heat released by high-temperature and high-pressure gas compressed by the compressor in the condensation process to outdoor air through the fin heat exchanger, the specific heat capacity and the density of the air are low, the temperature rise of the air is generally about 10 ℃, and the average temperature of inlet air and outlet air is high; meanwhile, the heat transfer coefficient of the air side is low, and the required heat exchange temperature difference is large. Therefore, the condensing temperature of the air-cooled cold and hot water unit is very high, the refrigeration energy efficiency is usually only 2.6-3.0, the energy consumption of the system is overlarge, and the national energy-saving and emission-reducing policy is not met.
Meanwhile, the conventional air-cooled cold and hot water unit generally adopts four-way valve reverse circulation defrosting, when the four-way valve is switched in or out of a defrosting mode, a large amount of liquid refrigerant enters a gas-liquid separator to cause the compressor to run wet, and the heating capacity of the unit and the running reliability of the compressor are seriously influenced. Meanwhile, the unit is in refrigeration operation during defrosting, and the temperature of the hot water in the air conditioner is rapidly reduced, so that the stability of the water temperature and the comfort of heat supply are influenced.
When a conventional air-cooled cold and hot water unit performs refrigeration operation in summer, a low-pressure gas refrigerant coming out of a water side heat exchanger of an air conditioner generally needs to sequentially pass through a four-way valve and a gas-liquid separator and then enters a compressor, and the on-way resistance and the local resistance of a low-pressure suction pipeline are large, so that the suction pressure of the compressor and the refrigeration efficiency of the unit are reduced.
Whether the water cooling water chilling unit or the air cooling water chilling and heating unit is adopted, a large amount of condensation waste heat needs to be discharged to the outdoor atmosphere environment in summer, so that the outdoor temperature is obviously increased, and the urban heat island effect is caused. If the part of heat can be recycled to prepare sanitary hot water, the unit can provide zero-cost hot water, so that the dual-purpose of one machine is achieved, and the energy utilization efficiency is undoubtedly and effectively improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome prior art not enough, provide an evaporation cold screw rod hot and cold water unit of taking total heat recovery.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an evaporative cold screw cold and hot water unit with total heat recovery comprises a screw compressor connected in a refrigeration cycle loop, an oil separator connected with a high-pressure outlet of the screw compressor, a first electric valve and a second electric valve connected with a gas outlet of the oil separator, a third electric valve connected with the first electric valve, an evaporative condenser connected with the second electric valve, and a first electromagnetic valve connected with an oil outlet of the oil separator and a suction side of the screw compressor, the system comprises a total heat recoverer connected with the evaporative condenser, a fourth electric valve connected with the total heat recoverer, a liquid reservoir connected with the third electric valve, a drying filter connected with the liquid reservoir, a first throttle valve connected with the drying filter, an air-conditioning water side heat exchanger connected with the first throttle valve, and a check valve connected with the first throttle valve and the fourth electric valve; the air-conditioning water side heat exchanger is connected with the third electric valve; when the unit is in a refrigeration mode, high-temperature and high-pressure gas discharged by the screw compressor enters the evaporative condenser to discharge heat to outdoor air and circulating water, then is condensed into high-pressure liquid, then is throttled and reduced in pressure by the first throttle valve to form low-temperature and low-pressure gas-liquid two-phase refrigerant, then is cooled and evaporated into low-pressure gas by the heat exchanger on the water side of the air conditioner to absorb the heat of the chilled water of the air conditioner, and then directly returns to the screw compressor by the electric valve, unlike the conventional air-cooled cold and hot water unit, the low-pressure air suction pipeline between the heat exchanger on the water side of the air conditioner and the screw compressor is not required to pass through the four-way valve and the gas-liquid separator, so that the low-pressure air suction, the air suction pressure and the air suction saturation temperature of the screw compressor are effectively improved, and therefore the refrigerating capacity and the refrigerating energy efficiency of the unit are improved.
The unit adopts the evaporative condensation technology in the summer refrigeration mode, and the condensation temperature can be reduced by about 4-5 ℃ compared with the conventional water cooling unit and can be reduced by about 15 ℃ compared with the conventional air cooling unit. And the refrigerating energy efficiency of the unit can be improved by about 60 percent compared with that of an air-cooled cold and hot water unit, and the energy-saving advantage is obvious. When the unit is in a refrigeration and total heat recovery mode, high-temperature and high-pressure gas discharged by the screw compressor enters a total heat recovery device to discharge heat to sanitary or process hot water for heating and condensing the heat into high-pressure liquid, then the high-pressure liquid is throttled and reduced in pressure by a throttle valve to form a low-temperature and low-pressure gas-liquid two-phase refrigerant, the air-conditioning water side heat exchanger absorbs the heat of air-conditioning chilled water to cool the heat and evaporate the heat into low-pressure gas, and the low-pressure gas directly returns to the screw compressor by an electric valve without entering the screw compressor after passing through a four-way valve and a gas-liquid separator like a conventional cold and hot water unit, so that a low-pressure suction pipeline between the air-conditioning water side heat exchanger and the screw compressor can be simplified, the on-way resistance of the low-pressure suction pipeline and the local, thereby improving the refrigerating capacity and the refrigerating energy efficiency of the unit.
The evaporation cold screw cold and hot water unit with total heat recovery further comprises: the second electromagnetic valve is connected with the drying filter, a second throttling valve and a third throttling valve are connected with the second electromagnetic valve, a first finned heat exchanger is connected with the second throttling valve, a finned heat exchanger is connected with the third throttling valve, a first four-way valve is connected with the first finned heat exchanger, a second four-way valve is connected with the second finned heat exchanger, and a gas-liquid separator is connected with the first four-way valve and the second four-way valve; when the unit is in a heating mode, high-temperature and high-pressure gas discharged by the screw compressor enters an air conditioner water side heat exchanger to discharge heat to air conditioner hot water to heat the air conditioner hot water, the air conditioner hot water is condensed into high-pressure liquid, the high-pressure liquid is throttled and reduced in pressure by a throttle valve to form low-temperature and low-pressure gas-liquid two-phase refrigerant, the low-pressure gas is evaporated after the heat is taken from outdoor air by a fin heat exchanger to form low-pressure gas, and the low-pressure gas finally returns to the screw compressor;
the evaporative cold screw cold and hot water unit with the total heat recovery function further comprises a second one-way valve connected with the first fin heat exchanger and a third one-way valve connected with the second fin heat exchanger; when the unit is in a hot water mode, high-temperature and high-pressure gas discharged by the screw compressor discharges heat to sanitary or process hot water through a total heat recoverer to heat the hot water, then the high-temperature and high-pressure gas is condensed into high-pressure liquid, then the high-pressure liquid is subjected to throttling and pressure reduction through a throttle valve to obtain low-temperature and low-pressure gas-liquid two-phase refrigerant, the low-temperature and low-pressure gas is evaporated into low-pressure gas after the heat is extracted from outdoor air through a fin heat exchanger, and finally the low-pressure gas returns;
a first high-pressure interface a and a second high-pressure interface a on the first four-way valve are connected with an air side outlet of the oil separator; when the unit is in a hot water or heating mode in winter, if the finned heat exchanger is frosted seriously, the corresponding four-way valve is switched, most of high-temperature and high-pressure gas discharged from the screw compressor enters a total heat recoverer or an air conditioner water side heat exchanger to heat sanitary, process hot water or air conditioner hot water and then is condensed into high-pressure liquid, the rest high-temperature and high-pressure gas enters the finned heat exchanger through a high-pressure connector a and a connector c of the four-way valve, a frost layer on the surface of a fin is heated to melt the frost and then is condensed into high-pressure liquid, and the two paths of high-pressure liquid are mixed and then enter other partial defrosting units which do not need defrosting. At the moment, the fin heat exchanger of the partial defrosting unit is used as an evaporator, high-pressure liquid is throttled and depressurized by the throttle valve of the partial defrosting unit to be low-temperature and low-pressure gas-liquid mixed refrigerant, then enters the fin heat exchanger to absorb heat from outdoor air with relatively high temperature and evaporate the heat to be low-pressure gas, then enters the gas-liquid separator through the four-way valve interface c and the low-pressure interface b of the partial defrosting unit, and finally returns to the low-pressure air suction port of the screw compressor to be compressed to be high-temperature and high-pressure gas. Therefore, when the related fin heat exchangers are subjected to independent defrosting by weight, the unit can still heat sanitary, process hot water or air-conditioning hot water so as to maintain normal heat supply capacity.
To sum up, the utility model has the advantages of it is following: through the utility model, the unit can realize the switching among four functions of refrigeration, heating, refrigeration + total heat recovery and hot water and the operation modes by controlling the on-off state of the electric valve and the electromagnetic valve; meanwhile, the unit can realize the independent defrosting function of the fin heat exchanger component by controlling the on-off of the four-way valve. The requirements of refrigeration, heating, sanitation or process hot water of conventional building or industrial projects all the year round are met through the total heat recoverer, the purposes of waste heat recovery, multiple purposes of one machine, environmental protection and energy conservation are achieved, the operating cost is effectively saved, and the equipment investment cost is reduced; the full-automatic intelligent full-heat recoverer can recycle most of waste heat and produce drinking hot water and domestic hot water, thereby reducing energy waste.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Detailed Description
In order to make the technical field personnel understand the utility model discloses the scheme, will combine the drawing in the embodiment of the utility model below, to the technical scheme in the embodiment of the utility model clear, complete description.
As shown in fig. 1, an evaporative cold screw cold and hot water unit with total heat recovery comprises a screw compressor 1, an oil separator 2, a first electric valve 16, a second electric valve 17, a third electric valve 5, an evaporative condenser 4, a first electromagnetic valve 24, a total heat recoverer 14, a fourth electric valve 19, a liquid reservoir 6, a drying filter 7, a first throttle valve 9, an air-conditioning water side heat exchanger 10 and a first check valve 12; the screw compressor 1 is connected in a refrigeration cycle loop; the oil separator 2 is connected with the high-pressure outlet side of the screw compressor 1; the second electric valve 17 and the first electric valve 16 are connected with the gas outlet of the oil separator 2; the third electric valve 5 is connected with the first electric valve 16; the evaporative condenser 4 is connected with the second electric valve 17; the first electromagnetic valve 24 is connected with the oil outlet of the oil separator 2 and the suction side of the screw compressor 1; the total heat recoverer 14 is connected with the evaporative condenser 4; the fourth electric valve 19 is connected with the total heat recoverer 14; the liquid storage device 6 is connected with the third electric valve 5; the drying filter 7 is connected with the liquid storage device 6; the first throttle valve 9 is connected with the dry filter 7; the air-conditioning water side heat exchanger 10 is connected with the first throttling valve 9; the first check valve 12 connects the first throttle valve 9 with a fourth electric valve 19; the air-conditioning water side heat exchanger 10 is connected with the third electric valve 5.
The evaporation cold screw cold and hot water unit with total heat recovery further comprises: the second electromagnetic valve 8, the second throttle valve 22, the third throttle valve 23, the first finned heat exchanger 20, the second finned heat exchanger 21, the first four-way valve 3, the second four-way valve 15 and the gas-liquid separator 11; the second electromagnetic valve 8 is connected with the drying filter 7; the second throttle 22 and the third throttle 23 are connected with the second electromagnetic valve 8; the first finned heat exchanger 20 is connected with the second throttling valve 22; the second finned heat exchanger 21 is connected with the third throttle valve 23; the first four-way valve 3 is connected with the first finned heat exchanger 20; the second four-way valve 15 is connected with the second finned heat exchanger 21; the gas-liquid separator 11 is connected with the first four-way valve 3 and the second four-way valve 15;
the evaporative cold screw cold and hot water unit with the total heat recovery function further comprises a second one-way valve 13 and a third one-way valve 18; the second check valve 13 is connected with the first finned heat exchanger 20; the third check valve 18 is connected with the second finned heat exchanger 21;
and a high-pressure interface a of a first four-way valve 3 and a high-pressure interface a of a second four-way valve 15 in the evaporative cold screw cold and hot water unit with the total heat recovery are connected with an air side outlet of the oil separator 2.
The evaporative condenser 4 is connected with the total heat recoverer 14 in series, and in the process, the evaporative condenser 4 can be arranged in front of the total heat recoverer 14 or behind the total heat recoverer 14.
The refrigeration oil separated by the oil separator 2 returns to the suction side of the screw compressor 1 after passing through the electromagnetic valve in the running process of the unit.
The finned heat exchanger and the corresponding four-way valve, throttle valve and one-way valve form 1 group of independent defrosting unit, and the number of the defrosting units of each unit can be 2 or more.
The specific working process is as follows;
1. a refrigeration mode:
in the cooling mode of the unit, the electric valve 5, the electric valve 17 and the electric valve 19 are electrified, and the electric valve 16 and the electromagnetic valve 8 are powered off.
High-temperature and high-pressure gas refrigerant discharged by the screw compressor 1 enters an evaporative condenser 4 (a fan and a water pump of the condenser are in an operating state) through an oil separator 2 and an electric valve 17 to be condensed into high-pressure liquid, the high-pressure liquid enters a liquid storage device 6 through a total heat recoverer 14 (a sanitary or process hot water valve does not pass water), the electric valve, the drying filter 7, a throttle valve 9, the low-temperature and low-pressure gas-liquid mixed refrigerant after being throttled and decompressed, the low-temperature and low-pressure gas-liquid mixed refrigerant enters an air conditioner water side heat exchanger 10, the air conditioner chilled water heat with relatively high temperature is absorbed to cool the refrigerant and then is evaporated into low-pressure gas, and the low-temperature and high-pressure gas refrigerant enters an air suction.
2. Refrigeration + total heat recovery mode:
in the refrigerating and total heat recovery mode, the electric valve 5, the electric valve 17 and the electric valve 19 are electrified, and the electric valve 16 and the electromagnetic valve 8 are powered off.
High-temperature and high-pressure gas refrigerant discharged by the screw compressor 1 enters a total heat recoverer 14 after passing through an oil separator 2, an electric valve 17 and an evaporative condenser 4 (a fan and a water pump of the condenser stop running), exchanges heat with sanitary or process hot water with relatively low temperature, discharges a large amount of condensation heat to the sanitary or process hot water to heat the sanitary or process hot water, is condensed into high-pressure liquid, the high-pressure liquid enters a throttle valve 9 after passing through an electric valve 19, a liquid storage 6 and a drying filter 7, is throttled and reduced to low-temperature and low-pressure gas-liquid mixed refrigerant and then enters an air-conditioning water side heat exchanger 10, absorbs relatively high-temperature air-conditioning chilled water heat to cool the high-temperature and low-pressure gas after cooling, then enters an air suction port of the screw compressor 1 through an electric valve 5 to be compressed into high.
3. Heating mode
And in the heating mode of the unit, the electric valve 5, the electric valve 17 and the electric valve 19 are powered off, and the electric valve 16 and the electromagnetic valve 8 are powered on.
The high-temperature high-pressure gas refrigerant discharged by the screw compressor 1 enters the air-conditioning water side heat exchanger 10 after passing through the oil separator 2 and the electric valve 16, exchanges heat with air-conditioning hot water with relatively low temperature, discharges a large amount of condensation heat to the air-conditioning hot water, heats the air-conditioning hot water, and is condensed into high-pressure liquid. The high-pressure liquid enters the throttle valves 22 and 23 after passing through the one-way valve 12, the liquid storage device 6, the drying filter 7 and the electromagnetic valve 8, is throttled and decompressed into low-temperature low-pressure gas-liquid mixed refrigerant, then enters the first finned heat exchanger 20 and the second finned heat exchanger 21, exchanges heat with outdoor air with relatively high temperature, absorbs the heat of the outdoor air, cools the outdoor air, evaporates the outdoor air into low-pressure gas refrigerant after being cooled, then enters the gas-liquid separator after passing through the interfaces c and the low-pressure interfaces b of the four-way valves 3 and 15, then enters the screw compressor 1 to be compressed into high-temperature high-pressure gas refrigerant, and the cycle is repeated.
4. A hot water mode:
the electric valve 17, the electric valve 19 and the electromagnetic valve 8 of the unit are electrified in the hot water hot mode, and the electric valve 5 and the electric valve 16 are powered off.
The high-temperature high-pressure gas refrigerant discharged from the screw compressor 1 enters the total heat recoverer 14 through the oil separator 2, the electric valve 17 and the evaporative condenser 4 (the fan and the water pump of the condenser stop running), exchanges heat with sanitary or process hot water with relatively low temperature, discharges a large amount of condensation heat to the sanitary or process hot water, heats the sanitary or process hot water, and is condensed into high-pressure liquid. The high-pressure liquid enters the throttle valves 22 and 23 after passing through the one-way valve 12, the liquid storage device 6, the drying filter 7 and the electromagnetic valve 8, is throttled and depressurized into low-temperature low-pressure gas-liquid mixed refrigerant, then enters the first finned heat exchanger 20 and the second finned heat exchanger 21, exchanges heat with outdoor air with relatively high temperature, absorbs the heat of the outdoor air, cools the outdoor air, evaporates the outdoor air into low-pressure gas refrigerant, then enters the gas-liquid separator 11 after passing through the interfaces c and the low-pressure interfaces b of the four-way valves 3 and 15, and then enters the screw compressor 1 to be compressed into high-temperature high-pressure gas refrigerant, and the process is repeated.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (4)

1. The utility model provides a take evaporation cold screw rod hot and cold water unit of total heat recovery which characterized in that: the device comprises a screw compressor (1) connected in a refrigeration cycle loop, an oil separator (2) connected with a high-pressure outlet of the screw compressor, a first electric valve (16) connected with a gas outlet of the oil separator, a second electric valve (17), a third electric valve (5) connected with the first electric valve, an evaporative condenser (4) connected with the second electric valve (17), a first electromagnetic valve (24) connected with an oil outlet of the oil separator (2) and a suction side of the screw compressor, a total heat recoverer (14) connected with the evaporative condenser (4), a fourth electric valve (19) connected with the total heat recoverer (14), a liquid reservoir (6) connected with the fourth electric valve (19), a drying filter (7) connected with the liquid reservoir (6), a first throttle valve (9) connected with the drying filter (7), An air-conditioning water side heat exchanger (10) connected with the first throttling valve, and a check valve (12) connected with the first throttling valve (9) and a fourth electric valve (19); the air-conditioning water side heat exchanger (10) is connected with the third electric valve (5).
2. The evaporative cold screw chiller/heater unit with total heat recovery of claim 1, wherein: the drying and filtering device is characterized by further comprising a second electromagnetic valve (8) connected with the drying and filtering device (7), a second throttling valve (22) and a third throttling valve (23) connected with the second electromagnetic valve (8), a first finned heat exchanger (20) connected with the second throttling valve (22), a second finned heat exchanger (21) connected with the third throttling valve (23), a first four-way valve (3) connected with the first finned heat exchanger (20), a second four-way valve (15) connected with the second finned heat exchanger (21) and a gas-liquid separator (11) connected with the first four-way valve (3) and the second four-way valve (15).
3. The evaporative cold screw chiller/heater unit with total heat recovery of claim 2, wherein: the heat exchanger also comprises a second check valve (13) connected with the first finned heat exchanger (20) and a third check valve (18) connected with the second finned heat exchanger (21).
4. The evaporative cold screw chiller/heater unit with total heat recovery of claim 3, wherein: and a high-pressure interface a of the first four-way valve (3) and a high-pressure interface a of the second four-way valve (15) are connected with an air side outlet of the oil separator (2).
CN202022096800.1U 2020-09-22 2020-09-22 Evaporative cold screw cold and hot water unit with total heat recovery Active CN213687345U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022096800.1U CN213687345U (en) 2020-09-22 2020-09-22 Evaporative cold screw cold and hot water unit with total heat recovery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022096800.1U CN213687345U (en) 2020-09-22 2020-09-22 Evaporative cold screw cold and hot water unit with total heat recovery

Publications (1)

Publication Number Publication Date
CN213687345U true CN213687345U (en) 2021-07-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022096800.1U Active CN213687345U (en) 2020-09-22 2020-09-22 Evaporative cold screw cold and hot water unit with total heat recovery

Country Status (1)

Country Link
CN (1) CN213687345U (en)

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