JP2005121280A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system that performs air conditioning in a different temperature setting between an internal zone (interior zone) in space and an outer wall section zone (perimeter zone) at the periphery of the internal zone, reduces the scale of heat source facilities used in that case, and reduces the amount of energy used in the entire system. <P>SOLUTION: In the air conditioning system for air conditioning the inside of the space 1 comprising the interior zone 2 and a perimeter zone 3 by air conditioning facilities, a number of radiation panels 5 having a pipe for passing water inside are arranged on the ceiling at the interior zone 2, radiation cooling is made by the heat exchange of water passed to the inside of the pipe, and the perimeter zone 3 is air conditioned by an air conditioner 13 in a heat source heat pump system. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air conditioning system that increases energy efficiency.

  Conventionally, an air conditioning system that performs air conditioning in a relatively large area such as an office, an auditorium, or a library has a tube placed on a panel or the like, and cold water at a temperature of about 15 ° C or hot water at a temperature of about 35 ° C is passed through the tube. Air conditioning equipment that performs air conditioning by maintaining the panel surface at a predetermined temperature and performing heat exchange by radiation, air conditioning equipment that performs cooling and heating using water as a heat source (see Patent Document 1), or a plurality of these air conditioning equipment An air conditioning system that performs air conditioning over a wide area is known.

Japanese Patent Publication No. 7-104019

  In the air conditioning system, in a relatively wide area, there are an outer wall zone (perimeter zone) that is susceptible to external factors such as the weather at the windows and walls, and an internal zone (interior zone) where people are mainly active. Air conditioning equipment that performs air conditioning by changing the temperature setting is provided, and air conditioning is performed so that people who are active in the area have a comfortable temperature.

  These air-conditioning facilities are air-conditioning facilities that utilize heat exchange of the water, and require a temperature difference between the radiant panel and the room. For example, the outer wall zone (perimeter zone) of a building has a climate such as solar radiation and outside temperature. Due to the large influence of air conditioning, the daily load fluctuations in air conditioning equipment are severe, and heating is required in winter. However, the internal zone (interior zone) is mostly heated by lighting and office equipment, and the human body. In many cases, there is no load fluctuation and cooling is necessary throughout the year. Therefore, when air conditioning is performed without distinguishing the outer wall zone (perimeter zone) and the inner zone (interior zone), either the outer wall zone (perimeter zone) or the inner zone (interior zone) must be prioritized. The other must be sacrificed. In general, an air-conditioning system to which the radiant panel is applied takes time until the effect of air-conditioning and heating appears. Therefore, there is a problem in response to load fluctuations, and water is passed through the panel to improve the efficiency of air-conditioning. When the temperature of the water is lowered, condensation may occur on the panel surface due to the temperature difference between the temperature of the cold water being passed and the temperature of the air in the zone.

  The present invention has been made paying attention to such problems, and performs air conditioning at different temperature settings in the inner zone (interior zone) of the space and the outer wall zone (perimeter zone) around the inner zone. It is an object of the present invention to provide an air conditioning system capable of reducing the amount of energy used in the entire system while reducing the size of the heat source equipment used at the time.

In order to solve the above-described problem, the air conditioning system according to claim 1 of the present invention is an air conditioning system that performs air conditioning with air conditioning equipment in a space constituted by an interior zone and a perimeter zone. A large number of radiant panels having pipes for water passage are arranged on the ceiling, radiantly cooled by heat exchange of water passed through the pipes, and the perimeter zone is of a forced convection system using a blower It is characterized by being air-conditioned by an air conditioner.
According to this feature, outdoor temperature effects can be completely blocked by the perimeter zone, so that uniform air conditioning can be performed throughout the interior zone, energy-saving radiant cooling is possible, and the interior zone is quiet and soft. Air conditioning can be performed and the cost of air conditioning equipment can be reduced.

The air conditioning system according to claim 2 of the present invention is an air conditioning system that air-conditions a space constituted by an interior zone and a perimeter zone by air conditioning equipment, and the interior zone has a pipe for water passage inside. A large number of radiant panels are arranged on the ceiling, radiated and cooled by heat exchange of water passed through the pipe, and the perimeter zone is air-conditioned by a water heat source heat pump type air conditioner. Yes.
According to this feature, outdoor temperature effects can be completely blocked by the perimeter zone, so that uniform air conditioning can be performed over the entire interior zone, energy-saving radiant cooling is possible, and the interior zone is quiet and soft. Air conditioning can be performed.

The air conditioning system according to claim 3 of the present invention is the air conditioning system according to claim 2,
The air conditioning facility is provided with a heat source facility, and cold water having a predetermined temperature is supplied to the radiation panel by the heat source facility, and the cold water heated by the radiation panel is used as the heat source water. The heat source water supplied to the heat source heat pump type air conditioner and heated or lowered by the air conditioner is returned to the heat source facility, cooled or heated, and supplied again to the radiation panel as cold water having the predetermined temperature. It is characterized by air conditioning.
According to this feature, since the cold water heat-exchanged with the room temperature of the interior zone by the radiation panel can be used as the heat source water of the water source heat pump type air conditioner, the waste heat of the interior zone is effective as the heating heat source of the perimeter zone. It can be used for the energy saving air conditioning system.

The air conditioning system according to claim 4 of the present invention is the air conditioning system according to claim 2 or 3,
The temperature of the cold water supplied to the radiant panel is 15 ° C. to 20 ° C., and the temperature of the cold water supplied to the water heat source heat pump type air conditioner is 15 ° C. to 25 ° C.
According to this feature, since the temperature of the cold water is close to the set room temperature of the interior zone, there is no fear that condensation occurs in the radiant panel, and in order to use relatively high temperature cold water, The energy efficiency is improved because the machine is not overloaded, and the energy loss can be reduced, air conditioning can be performed, and even heat source equipment with a small capacity can be applied. Efficiency is further improved.
In addition, since the water temperature of ground water, river water, etc. is close to the temperature of the cold water, it becomes possible to use the ground water and the like. Depending on the season, the cooling water from the cooling tower can be used as it is as the supply water.

The air conditioning system according to claim 5 of the present invention is the air conditioning system according to claim 2,
Cooling / warming air outlets discharged from the water source heat pump type air conditioner are arranged at predetermined locations in the perimeter zone.
According to this feature, the space of the perimeter zone from the ceiling to the floor surface can be reliably cooled in a short time by the momentum of the cool air blown from the air outlet during cooling, and the air is blown out from the air outlet during heating. With the momentum of warm air, it is possible to reliably stir warm air that tends to stay in the upper space of the perimeter zone, to uniformly heat the space from the ceiling to the floor, and to prevent the temperature effect of the perimeter zone from affecting the interior zone it can.

The air conditioning system according to claim 6 of the present invention is the air conditioning system according to claim 5,
The outlet is characterized by being arranged at a predetermined position in the longitudinal direction along a boundary line with the radiation panel on the ceiling of the perimeter zone.
According to this feature, since the air curtain is formed at the boundary between the interior zone and the perimeter zone, the influence of the outdoor temperature difference can be reliably blocked by the perimeter zone, and the air conditioning of the interior zone is not affected. be able to.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the present embodiment, a library constructed in a university or the like will be described as an example as a relatively wide area for air conditioning.

  First, FIG. 1 is a schematic plan view of a library 1 to which an air conditioning system according to an embodiment of the present invention is applied, FIG. 2 is a schematic plan view of a ceiling surface of the library 1, and FIG. A-A enlarged schematic cross-sectional view is shown.

  The air conditioning system in the present embodiment performs air conditioning of a vast space of the library 1, and the library 1 has a space surrounded by a wall portion 1C, and the space occupies a central portion. It is divided into an interior zone 2 and a perimeter zone 3 around the interior zone 2, and each of the interior zone 2 and the perimeter zone 3 is provided with air conditioning equipment for adjusting the air temperature in each zone. The air conditioning inside is to be implemented.

  In the interior zone 2, the library 1 is a reading place where a reading desk 1a, a bookshelf 1b, and the like are arranged, and the set temperature of the air temperature is generally said to be a temperature that people feel comfortable 26 ° C. The set humidity is 50%. In the interior zone 2, heat of a temperature higher than the indoor air temperature is always released from a user, a computer, etc., so the indoor air temperature tends to constantly rise, and the interior zone 2 is always cooled. It is like that.

  On the other hand, the perimeter zone 3 is a zone other than the viewing place such as the entrance and the window in the library. This is due to various external factors such as outside temperature, sunshine, weather, and ventilation. Since the temperature of the air is likely to change, the temperature is often higher than that of the interior zone 2 in the summer and the opposite in the winter. In many cases, the air temperature is lowered by changing the setting of the cooling / heating in the perimeter zone 3.

  Here, the air conditioning equipment applied in the air conditioning system of the present embodiment will be described. First, in the interior zone 2, as shown in FIG. 2, a plurality of pipes for passing water are arranged on the ceiling portion. The radiant panel 5 is provided, cold water having a constant temperature (15 ° C. to 20 ° C.) is passed through the pipe, and the heat is exchanged by the temperature of the cold water and the air temperature in the room, so that the air in the interior zone 2 The temperature is adjusted, and a plurality of air outlets 4 are arranged on the ceiling of the perimeter zone 3. As shown in FIG. 3, the air blown out in the arrow direction from the air outlets 4. 14, the temperature of the air in the perimeter zone 3 is adjusted.

  The structure of the radiation panel 5 applied to the air conditioning equipment in the interior zone 2 in this embodiment will be described with reference to FIG. FIG. 4A shows a partially broken rear view of the radiation panel 5, and FIG. 4B shows an BB enlarged cross-sectional view of FIG. 4A.

  The radiation panel 5 is provided with a heat insulating material 8 between the upper surface 7 and the lower surface 11 thereof. Below the eight layers of the heat insulating material, that is, directly above the lower surface 11, a plurality of substantially U-shaped water passage pipes 6 are arranged so that the intervals are uniform, and one end of the water passage pipe 6 is an inlet into which water enters. 9, the other end is connected to a discharge port 10 through which water exits the radiation panel 5, and water is passed through the water inlet pipe 6 from the inlet 9, and the passed water passes through the water pipe 6. The air passes through the interior air while exchanging heat, and is discharged from the discharge port 10 to the outside of the radiation panel 5. A plurality of these radiation panels 5 are connected and provided on the ceiling surface of the library 1.

  In this way, for the air conditioning in the interior zone 2, the radiation panel 5 that performs air conditioning by heat exchange of the water that is passed through the interior is applied, so that the cold air blows out directly from the air conditioning equipment and directly hits a person. Therefore, quiet and soft air conditioning can be performed without sound from the air conditioning equipment.

  As described above, the perimeter zone 3 is provided on the outer periphery of the interior zone 2, and the perimeter zone 3 is cooled and heated by the air 14 blown out from the outlet 4 so that the influence of the outdoor temperature difference is blocked by the perimeter zone 3. In addition, since the air conditioning in the interior zone 2 is not affected as much as possible, the interior zone 2 can perform a quiet and soft air conditioning by the radiation panel 5 described above.

  For example, when the air temperature in the perimeter zone 3 is higher than the air temperature set in the interior zone 2, cooling is performed, and conversely, the air temperature in the perimeter zone 3 is lower than the air temperature set in the interior zone 2. It is supposed to do heating.

  In addition, since the air outlet 4 is provided at a predetermined position on the ceiling of the perimeter zone 3, the ceiling is reliably and in a short time due to the momentum of the cool air (air 14) blown from the air outlet 4 on the ceiling during cooling. In addition to cooling the perimeter zone 3 from the floor to the floor, the warm air that tends to stay in the space above the perimeter zone 2 is reliably stirred by the momentum of the warm air (air 14) blown from the outlet 4 on the ceiling during heating. Since the space from the ceiling to the floor can be heated uniformly, as described above, the influence of the outdoor temperature difference can be blocked by the perimeter zone 3, and the air conditioning of the interior zone 2 is not affected as much as possible. Yes.

  The air outlet 4 is connected to a water heat source heat pump type air conditioner 13 (hereinafter referred to as a heat pump air conditioner), and the heat pump air conditioner 13 performs air conditioning by exchanging heat of water passed through the air outlet. It is an air conditioner.

  The heat pump air conditioner 13 will be briefly described. The heat pump air conditioner 13 according to the present embodiment is an air conditioner to which a water heat source heat pump unit that performs air conditioning using water as a heat source is applied, and includes a compressor inside. When the compressor is operated, heat is taken from the room, the heat taken from the room is radiated to the water passed through the interior, cooling is performed, and when heating is performed, The compressor is operated to take heat from the water that has flowed into the interior, and the taken heat is radiated into the room for heating.

  By connecting the radiant panel 5 and the water heat source heat pump unit in series, the conveyance power of the circulation pump can be reduced, and in the winter season, the cooling heat of the interior zone 2 can be reduced by using the water heat source heat pump unit. It can be used as a heating heat source for the perimeter zone 3 to save energy.

  However, in order to perform cooling when the temperature of the water supplied into the heat pump air conditioner 13 is higher than 15 ° C. to 25 ° C., a large load is applied to the air conditioner. In order to perform heating when the temperature is lower than 25 ° C. to 25 ° C., the efficiency of heat exchange is deteriorated in the air conditioner, and thus the energy efficiency of the air conditioning is deteriorated.

  Therefore, as described above, by connecting the radiation panel 5 and the water heat source heat pump unit in series, the water supplied into the heat pump air conditioner 13 is generally stable at 15 ° C. to 25 ° C. Temperature water can be supplied and energy efficient air conditioning can be performed.

  Further, a function of dehumidification or humidification may be added in the heat pump air conditioner 13, and in this way, humidity adjustment in the air can be performed without newly providing a dehumidifier or a humidifier. Therefore, it is possible to perform air conditioning in which consideration is given not only to the temperature of air but also to humidity.

  Next, FIG. 5 shows a piping diagram of the air conditioning system in the present embodiment.

  The air conditioning system of the present embodiment is provided with a heat source facility 12 for supplying water at a constant temperature to the above-described air conditioning facility, and the temperature of the water is adjusted by the heat source facility 12. .

  Moreover, although the said heat source equipment 12 is comprised from the refrigerator and the cooling tower, natural energy, such as groundwater and river water, can also be utilized as a heat source, without installing these apparatuses.

  A predetermined temperature supplied from the heat source facility 12 when the air temperature in both the interior zone 2 and the perimeter zone 3 fluctuates from the set temperature by temperature sensors (not shown) provided in the interior zone 2 and the perimeter zone 3. Cold water having a temperature of 18 ° C. in this embodiment is supplied into the radiant panel 5 in the interior zone 2 by the circulation pump 15, and the cold water supplied in the radiant panel 5 is supplied to the interior zone 2 in the radiant panel 5. After heat exchange with the air inside, the heat pump air conditioner 13 is supplied.

  After the air in the perimeter zone 3 and the cold water passed through the heat pump air conditioner 13 are subjected to heat exchange, the cold water returns to the heat source facility 12 again, and the supplied water is supplied from these heat sources. It circulates in the facility 12, the radiation panel 5, and the heat pump air conditioner 13.

  When assuming a temperature of 26 ° C. and a humidity of 50%, which is a general indoor condition during cooling, the temperature of the panel surface needs to be maintained at about 20 ° C. The temperature of the cold water supplied from the heat source facility 12 is as follows. 15 ° C. to 20 ° C. is preferable, and when cold water having a temperature of 7 ° C. manufactured by a general refrigerator lower than this temperature is supplied, not only an excessive load is applied to the refrigerator, but also in the interior zone 2 The temperature difference described above may cause condensation on the surface of the radiant panel 5 due to a temperature difference from the air, and conversely, if the temperature of the chilled water is higher than 15 ° C. to 20 ° C., the radiation cooling effect becomes extremely weak. Is preferred.

  Further, if the temperature of the cold water is 15 ° C. to 20 ° C., it becomes possible to use groundwater or the like whose temperature is relatively stable. In addition, although the temperature of groundwater varies somewhat depending on the region, the temperature of groundwater is distributed in the range of 14 ° C to 20 ° C at a depth (between 10m and 26m) where the temperature is constant throughout the year, which is called the constant temperature depth. It is said that

  Next, actual air conditioning will be described with reference to FIG. Here, the air temperature of the interior zone 2 when air conditioning is performed is 28 ° C., the air temperature of the perimeter zone 3 is 30 ° C., which is measured by the above-described temperature sensor, that is, the air temperature of the interior zone 2 A case where the air temperature in the perimeter zone 3 is high will be described.

  The air conditioning set temperature in the interior zone 2 is 26 ° C. as described above, and in the heat source facility 12, the temperature of the cold water supplied to the radiation panel 5 is set to 15 ° C. to 20 ° C., here 18 ° C. , And supplied to the radiation panel 5.

  When cold water is supplied into the radiant panel 5, cold water passes through the water pipe 6 and the air temperature in the interior zone 2 is 28 ° C., so that the radiant panel 5 having a temperature of 18 ° C., which is lower than the air temperature, passes through the radiant panel 5. The cold water in the water pipe 6 is heat-exchanged with the air in the interior zone 2, the air temperature drops to the set temperature of 26 ° C., and the cold water is discharged from the radiation panel 5 with the water temperature raised to 20 ° C.

  Next, the cold water that has reached 20 ° C. is supplied into the heat pump air conditioner 13 that air-conditions the perimeter zone 3.

  On the other hand, since the air temperature in the perimeter zone 3 is 30 ° C., the air temperature in the perimeter zone 3 must be lowered to the set temperature of 26 ° C. so as not to affect the air temperature in the interior zone 2 as much as possible. Instead, the perimeter zone 3 is cooled, and the 20 ° C. water supplied into the heat pump air conditioner 13 absorbs heat, the water temperature rises to 23 ° C., and returns to the heat source facility 12 again. .

  In the heat source facility 12, the water that has become 23 ° C. is cooled again to 18 ° C. and supplied again to the radiation panel 6 in the interior zone 2.

  Here, in order to supply and use the cold water whose temperature has increased by 2 ° C. by absorbing the heat of the air in the interior zone 2 as the heat source water of the heat pump air conditioner 13 that performs air conditioning in the perimeter zone 3 in the interior zone 2, It is not necessary to provide the heat source facility 12 for each air conditioning facility (radiation panel 5, heat pump air conditioner 13) provided for each zone, and only by using a single heat source facility, the interior zone 2 and the perimeter zone 3 Air conditioning in both zones can be carried out, and the energy efficiency of the entire air conditioning system can be improved and energy saving can be achieved.

  Moreover, since the temperature of the cold water supplied to the heat pump air conditioner 13 is 20 ° C., cold water having a high energy efficiency in the heat pump air conditioner 13 is supplied as described above. Air conditioning can be performed.

  In this embodiment, the radiant panel 5 is provided with a control valve 17, and the interior zone 2 can be kept at a set room temperature by controlling the amount of cold water supplied to the radiant panel 5, and is necessary. Accordingly, the supply of cold water to the radiation panel 5 can be stopped. In this case, since cold water is supplied to the heat pump air conditioner 13 via the bypass pipe 18, energy saving air conditioning can be performed without performing unnecessary heat exchange in the radiation panel 5.

  Further, the heat pump air conditioner 13 is provided with a circulation pump 16, and the circulation pump 16 is operated in conjunction with the operation of the heat pump air conditioner 13. The heat source water supply can be stopped. In this case, since the heat source water is returned to the heat source device 12 via the bypass pipe 19, energy saving air conditioning can be performed without performing unnecessary heat exchange in the heat pump air conditioner 13.

  In this embodiment, as described above, the amount of cold water supplied and circulated to the radiation panel 5 and the heat pump air conditioner 13 is controlled, but the present invention is not limited to this. In this case, the equipment such as the control valve 17 for controlling the amount of cold water can be omitted, and the equipment cost can be reduced.

  Further, as shown in FIG. 6, by providing a blowout port 4 'in the longitudinal direction at the boundary between the interior zone 2 and the perimeter zone 3, the air blown from the blowout port 4' forms an air curtain 14 '. However, the air layer of the interior zone 2 and the perimeter zone 3 is divided by the layer of the air curtain 14 ′, and the influence of the outdoor temperature difference can be surely blocked by the perimeter zone 3. The air conditioning can be prevented from being affected.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the radiation panel 5, a large number of water pipes 6 are placed in parallel so as to repeat a U-shape (see FIG. 4) in the longitudinal direction of the radiation panel, but one water pipe is repeated in an S-shape. It is sufficient that the pipe is a water pipe that can be surely radiatively cooled, such as being mounted, and the radiation panel 5 is provided with a heat insulating material 8 between the upper surface 7 and the lower surface 11. If there is no problem with radiation cooling, it may be omitted.

  For example, the air outlet 4 of the heat pump air conditioner 13 is arranged on the ceiling of the perimeter zone 3, but the arrangement position is not limited to the ceiling but may be a wall or a floor. It only has to be able to heat. Further, an indoor exposure type heat pump air conditioner to which a blowout port is attached may be arranged directly in the room.

  For example, the heat pump air conditioner 13 is arranged to cool an outer wall zone (perimeter zone), but the heat pump air conditioner 13 is located in an internal zone (interior zone) such as a conference room or a break lobby. However, you may arrange | position in order to air-condition and cool the room from which the use time of a room and the condition of an air-conditioning load differ greatly from the surrounding interior zone.

  For example, in this embodiment, a water heat source heat pump type air conditioner (heat pump air conditioner) using heat source water of 15 ° C. to 25 ° C. for cooling and heating the perimeter zone is arranged. Temperature setting of the perimeter zone Depending on the condition of the air conditioning load, the air may be directly cooled or heated with heat source water, or a fan coil unit type air conditioner may be used instead of the heat pump air conditioner.

It is a schematic plan view of the library applied in the present embodiment. It is a schematic plan view of the ceiling surface of the library applied in the present embodiment. It is an AA expanded sectional view of FIG. (A) is a partially broken figure which shows the mode of the radiation panel applied in the present Example, (b) is BB expanded sectional drawing of (a). It is a piping diagram of the air-conditioning system of a present Example. It is AA expanded sectional drawing of another Example of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Library 1a Desk 1b Bookcase 1c Wall part 2 Interior zone 3 Perimeter zone 4 Outlet 4 'Outlet 5 Radiant panel 6 Water pipe 7 Upper surface 8 Heat insulating material 9 Inlet 10 Outlet 11 Lower surface 12 Heat source equipment 13 Water source heat pump type air conditioning (Heat pump air conditioner)
14 Air 14 ′ Air curtain 15 Circulation pump 16 Circulation pump 17 Control valve 18 Bypass pipe 19 Bypass pipe

Claims (6)

  In an air conditioning system that air-conditions a space composed of an interior zone and a perimeter zone using air conditioning equipment, the interior zone has a large number of radiant panels arranged on the ceiling, each having a water passage pipe. An air conditioning system, wherein the perimeter zone is radiatively cooled by heat exchange of water passed through the air, and the perimeter zone is air-conditioned by a forced convection type air conditioner using a blower.   In an air conditioning system that air-conditions a space composed of an interior zone and a perimeter zone using air conditioning equipment, the interior zone has a large number of radiant panels arranged on the ceiling, each having a water passage pipe. An air conditioning system characterized in that the perimeter zone is radiatively cooled by heat exchange of water passed through the air and is cooled and heated by a water heat source heat pump type air conditioner.   The air conditioning facility is provided with a heat source facility, and cold water having a predetermined temperature is supplied to the radiation panel by the heat source facility, and the cold water heated by the radiation panel is used as the heat source water. The heat source water supplied to the heat source heat pump type air conditioner and heated or lowered by the air conditioner is returned to the heat source facility, cooled or heated, and supplied again to the radiation panel as cold water having the predetermined temperature. The air conditioning system according to claim 2, wherein the air conditioning is performed.   The air conditioning according to claim 2 or 3, wherein the temperature of the cold water supplied to the radiation panel is 15 ° C to 20 ° C, and the temperature of the cold water supplied to the water heat source heat pump type air conditioner is 15 ° C to 25 ° C. system.   The air conditioning system according to claim 2, wherein cold air and warm air outlets discharged from the water heat source heat pump type air conditioner are disposed at predetermined positions in the perimeter zone.   6. The air conditioning system according to claim 5, wherein the outlet is disposed at a predetermined position in a longitudinal direction along a boundary line between the ceiling of the perimeter zone and the radiation panel.

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