JP5410169B2 - Radiant air conditioner - Google Patents

Description

  The present invention relates to a radiation cooling / heating device.

  Conventionally, the environment of perimeters such as general office buildings (peripheral areas in contact with windows and outer walls) is easily affected by direct sunlight and is the most severe thermal condition. Needed equipment. Examples of such equipment include equipment such as a fan coil unit (FCU), a double skin, and an airflow window, or a window system.

  As equipment for processing the load of the perimeter environment, convection type air conditioning equipment is used, and there are currently few perimeter processing equipment using radiation type air conditioning equipment. In addition, as a conventional radiation type | formula air conditioning installation, the apparatus disclosed by patent document 1 and 2 is known, for example.

  In overseas cases, a system is known in which the interior load is processed by the ceiling radiation air conditioning equipment, while the perimeter load is processed by a chilled beam. Here, a chilled beam is a coiled device with a rough fin pitch installed on the ceiling. Cool water is passed through this coil to cool the air around the coil, and the cooled air is cooled down indoors by natural convection. The heat load on the lower side of the room is removed.

  The one that cools down the air by natural convection is called a passive chilled beam, and the one that introduces air-conditioned primary air to forcibly cool the air down is called the active chilled beam. As an ability to remove the thermal load, the active chilled beam is superior to the passive chilled beam.

  FIG. 7 is a cross-sectional view showing an example of a passive chilled beam, and FIG. 8 is a cross-sectional view showing an example of an active chilled beam. As shown in FIG. 7, in the passive chilled beam, the air below the ceiling 3 passes through the surface of the coil 2 fixed by the connecting plate 1, and the air cooled by the coil 2 descends through the air passage 4 and blows out. It descends from the mouth 5 to the lower side of the room. Further, as shown in FIG. 8, the active chilled beam forcibly lowers the cold air conditioned by the heat exchanger 7 in the casing 6 to the indoor lower side by the fan 8 and the air passage 9.

  In the chilled beam, the temperature of the chilled water to be sent is 16 to 18 ° C. as in the case of the radiant panel, and it is not a dew condensation temperature as in the case of the FCU, so there is no need to provide a drain. Moreover, by adopting it together with the ceiling radiation air conditioning system, the air conditioning piping system can be made the same, and the increase in the number of pipes due to the introduction of the chilled beam is small, and it can be considered as a perimeter processing facility suitable for the ceiling radiation air conditioning system.

JP 2003-227632 A JP-A-9-42752

  By the way, when considering the application of the above-mentioned conventional chilled beam in Japan, it is rare that the load is reduced by measures such as solar shading that are often implemented overseas, such as the blind on the outer wall. Since the perimeter load is larger than in Northern Europe, an active chilled beam with a larger load processing capacity is considered suitable. However, since the conventional active chilled beam requires a duct for introducing air-conditioned primary air, the inherent advantage of the ceiling radiant panel that the use of the duct is minimized is lost.

  When using the active type that increases the processing capacity by attracting a perimeter with a large load, a device having a larger coil must be selected. Therefore, when the load is large (for example, when it is a midsummer west day), it will be fully effective, but overload will occur when the other load is relatively small (such as a time zone other than the evening) As a result, the cost increases.

  This invention is made | formed in view of the above, Comprising: It aims at providing the radiation cooling / heating apparatus which can reduce cost.

In order to solve the above-described problems and achieve the object, a radiant cooling / heating device according to claim 1 of the present invention is provided on a ceiling, and circulates cold water or hot water through a coiled pipe. A heat exchange means for cooling or heating the air, and a fan capable of sucking the air cooled or heated by the heat exchange means and blowing it out downward in the room, as an active chilled beam when the load is large, and when the load is small A ventilated radiant cooling and heating device that is a passive-active combined chilled beam that operates as a passive chilled beam, and when the load is large and operates as an active chilled beam, the heat exchanger is disposed on the side of the heat exchanger. The fan operates and air in the ceiling and indoor air exchanges heat from the upper and lower surfaces of the coiled piping. Passed into the stage and cooled or heated by the coiled pipe, the cooled or heated air is guided to the fan and forced out from the outlet toward the lower side of the room, and the load is small and a passive chilled beam. In the case where the air in the ceiling enters the heat exchange means from the upper surface of the coiled pipe and is cooled or heated by the coiled pipe, the cooled or heated air is It is configured to descend from the lower surface of the coiled pipe to the lower side of the room by natural convection, and in the case of heating, the room is heated by a radiation effect .

  A radiant cooling / heating device according to the present invention is provided on a ceiling and circulates cold water or hot water in a coiled pipe, thereby cooling or heating air around the pipe, and cooling by the heat exchange means. Alternatively, a ventilated radiant cooling / heating device including a fan that sucks heated air and blows it out downward in the room, and when the load is small, convection of the air cooled by the heat exchange means during cooling The air is lowered to the lower side of the room due to the effect, and the room is air-conditioned by the radiation effect during heating. On the other hand, when the load is large, the air cooled or heated by the heat exchanging means is forcibly lowered by the operation of the fan. The fan is operated only when necessary according to the magnitude of the load. This eliminates the need for a duct, and increases the degree of freedom by selecting the necessary capacity and fan, thereby reducing the cost.

FIG. 1 is a cross-sectional view showing an embodiment of a radiant cooling and heating apparatus according to the present invention. FIG. 2 is a side view showing an embodiment of the radiant cooling and heating apparatus according to the present invention. FIG. 3 is a plan view showing an embodiment of the radiant cooling and heating apparatus according to the present invention. FIG. 4 is a side view showing an embodiment of the radiant cooling and heating apparatus according to the present invention. FIG. 5 is an indoor temperature distribution diagram in the height direction obtained in the experiment. FIG. 6 is a distribution diagram of indoor temperature in the height direction obtained in an experiment. FIG. 7 is a cross-sectional view showing an example of a passive chilled beam. FIG. 8 is a cross-sectional view showing an example of an active chilled beam.

  Hereinafter, embodiments of a radiant cooling and heating apparatus according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a cross-sectional view showing an embodiment of a radiant cooling and heating apparatus according to the present invention. FIG. 2 is a side view showing an embodiment of the radiant cooling and heating apparatus according to the present invention, FIG. 3 is a plan view, and FIG. 4 is a side view.

  As shown in FIGS. 1 to 4, the radiant cooling and heating apparatus 10 according to the present invention is attached under the ceiling 12, and cools or heats the air around the coil 14 by circulating cold water or hot water through the coil 14. This is a box-shaped, ventilated radiant cooling and heating apparatus that includes a heat exchanging means 16 and a fan 20 that sucks air cooled or heated by the heat exchanging means 16 and blows it out to the lower side of the room 18.

  The radiant cooling / heating apparatus 10 is a passive-active combined chilled beam that operates as an active chilled beam when the load is large, and as a passive chilled beam when the load is small.

  When operating as an active chilled beam, the fan 20 disposed beside the heat exchanging means 16 operates, and the air in the ceiling 12 and the air in the room 18 enter the heat exchanging means 16 from the coil upper surface 14a and the lower surface 14b. Then, the coil 14 is cooled or heated. The cooled or heated air is guided to the side fan 20 and forcibly blown out from the outlet 22 toward the lower side of the room 18.

  On the other hand, when operating as a passive chilled beam, the air in the ceiling 12 enters the heat exchange means 16 from the coil upper surface 14 a and is cooled or heated by the coil 14. In the case of cooling, the cooled or heated air is lowered from the coil lower surface 14b to the lower side of the room 18 by natural convection. In the case of heating, room heating is performed by the radiation effect.

  Here, switching between the mode operating as the active chilled beam and the mode operating as the passive chilled beam may be performed by an operation input to a switch (not shown) provided in the room, or a sensor for detecting the magnitude of the load is set in the room. The mode may be automatically switched based on the detection signal of the sensor.

Next, an experiment conducted for verifying the effect of the present invention will be described.
As a prototype of the radiant cooling and heating apparatus 10, the one shown in FIGS. The dimensions of the prototype are about 1400 length × 500 width × 150 mm height, and the ability of the prototype as an active chilled beam is as shown in Table 1.

The cooling experiment conditions when this prototype was operated as an active chilled beam were the room temperature set value of 26 ° C. for both the interior and perimeter, the external load 3627.1 W (572 W / m), and the internal load 2640 W (40 W / m ² ). . The three prototypes are installed near the windows in the laboratory for air conditioning, and are compared with the room temperature distribution when the three prototypes are not installed. Note that a general ceiling radiant panel is provided on the ceiling in the laboratory, and this ceiling radiant panel is mainly responsible for air conditioning of the interior of the laboratory.

  FIG. 5 is an indoor temperature distribution diagram in the height direction obtained in the experiment. This figure shows the measurement results of the temperature distribution in the height direction in the interior and the perimeter for the case where the three prototypes are provided indoors and in the case where they are not provided. As shown in FIG. 5, when three prototypes are not provided (indicated as “no chilled beam installation” in FIG. 5), and when three prototypes are provided (indicated as “chilled beam installation” in FIG. 5). It can be seen that the temperature difference between the perimeter and the interior is alleviated. For this reason, it was confirmed that the perimeter load (at the maximum time of the year) shown in the above experimental conditions can be removed by the three prototypes.

  On the other hand, the capability of this prototype as a passive chilled beam is shown in Table 2.

The cooling experiment conditions when this prototype was operated as a passive chilled beam were set to a room temperature set value of 26 ° C. for both the interior and perimeter, an external load of 918 W (144 W / m), and an internal load of 2640 W (40 W / m ² ). Similar to the experimental conditions when operating as an active chilled beam, the three prototypes are installed near the windows in the laboratory for air conditioning, and compared with the room temperature distribution when three prototypes are not installed. Note that a general ceiling radiant panel is provided on the ceiling in the laboratory, and this ceiling radiant panel is mainly responsible for air conditioning of the interior of the laboratory.

  FIG. 6 is a distribution diagram of indoor temperature in the height direction obtained in an experiment. This figure shows the measurement result of the temperature distribution in the height direction at the position of the interior 6 m away from the window and the position of the perimeter 1 m away from the window. As shown in FIG. 6, it can be seen that there is almost no temperature difference between the position of the interior (indicated as 6 m from the window in FIG. 6) and the position of the perimeter (indicated as 1 m from the window in FIG. 6). For this reason, it was confirmed that the perimeter load (when only the amount of diffuse solar radiation) shown in the above experimental conditions can be removed by the three prototypes.

  In the above experiment, the effectiveness of the perimeter portion as a countermeasure was shown, but it can be applied to other load fluctuation countermeasures. For example, load fluctuation countermeasures can be considered for equipment such as copiers and printers installed in offices, where there are fluctuations in heat generation, and rooms such as conference rooms where many people come and go.

  As described above, the radiant cooling / heating device according to the present invention is useful for a general office building air-conditioning / heating device, and in particular, for a facility device that fluctuates in heat generation, such as a copying machine or a printer installed in an office. It is suitable as a heat removal device for removing heat and a cooling / heating device for a room such as a conference room where many people come and go.

DESCRIPTION OF SYMBOLS 10 Radiant cooling and heating apparatus 12 Ceiling 14 Coil 14a Coil upper surface 14b Coil lower surface 16 Heat exchange means 18 Indoor 20 Fan 22 Outlet

Claims (1)

Provided on the ceiling, by circulating cold water or hot water through the coiled pipe, heat exchange means for cooling or heating the air around the pipe, and the air cooled or heated by the heat exchange means is sucked into the room A ventilated radiant cooling and heating device that is a passive-active combined chilled beam that operates as an active chilled beam when the load is high, and as a passive chilled beam when the load is small ,
When the load is large and operates as an active chilled beam, the fan disposed on the side of the heat exchanging means operates, and the air in the ceiling and the air in the room are from the upper surface and the lower surface of the coiled pipe. It enters the heat exchanging means and is cooled or heated by the coiled pipe, and the cooled or heated air is guided to the fan and forcedly blown out from the outlet toward the indoor lower side,
When operating as a passive chilled beam with a small load, air in the ceiling enters the heat exchange means from the upper surface of the coiled pipe and is cooled or heated by the coiled pipe, and the cooled or heated air Is a radiant cooling and heating apparatus configured to descend downward from the lower surface of the coiled pipe by natural convection in the case of cooling, and to perform indoor heating by a radiant effect in the case of heating.

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