JP2559204B2 - Radiant cooling system with ice heat storage tank - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiant cooling system having an ice storage tank for comfortably cooling each room in a general building such as a building.

[0002]

2. Description of the Related Art Conventionally, a radiation type air conditioner has been known as a device capable of preventing partial cooling or excessive cooling of a human body due to direct cooling air and obtaining a refreshing feeling of the entire room. For example, JP-A-1-230940 and JP-A-2-1575.
There is one disclosed in Japanese Patent No. 53, etc.

The radiant cooling apparatus disclosed in these publications cools the heat transfer body by passing cooling air (air heating medium) to the back surface side of the heat transfer body, and thereby from the front surface side of the heat transfer body. It is intended to cool the whole room by the action of radiation. The cooling by radiation is excellent in that an overall cooling feeling can be obtained, and is often used to realize a comfortable cooling system.

It is also known in the prior art to perform the above-mentioned radiation type cooling apparatus using an air heating medium by using a water heating medium. In this case, a pipe for passing cooling water is provided on the back surface side of the heat transfer body provided on the ceiling, and the heat transfer body is cooled by passing the cooling water therethrough. When the water heating medium is used, the heat transfer body can be cooled more efficiently than when the air heating medium is used, so that a radiant cooling device having a higher cooling capacity can be realized. .

On the other hand, a cooling device having an ice heat storage tank is known as a device using a system other than the radiant cooling system described above. For example, those disclosed in Japanese Examined Patent Publication No. 1-273343 and Japanese Examined Patent Publication No. 2-5978 can be cited.

The cooling device having the ice heat storage tank makes ice in the ice heat storage tank by using the surplus electric power at midnight, and cools the cooling water through the ice heat storage tank during the daytime cooling. It is a thing. Since the latent heat when the state changes from ice to water can be used, it is characterized in that it can secure sufficient cooling capacity.

[0007]

The radiant cooling system using the above-mentioned air heating medium has a problem that the radiation efficiency is low and the radiation cooling is insufficient. For example, when a rock wool sound absorbing plate, which is usually used as a ceiling material, is used as a heat transfer body for radiation, the surface temperature is only about 24 to 24.5 ° C. when the room temperature is about 26 ° C. Even if the heat transfer body is changed to a metal material such as aluminum or stainless steel, the surface temperature is 2
It is about 3 to 23.5 ° C, and it cannot be said that the radiation efficiency is sufficient.

Further, in the radiant cooling apparatus using the water heating medium described above, when a metal material is used as the heat transfer body, the surface temperature can be lowered to about 20 ° C., but the cooling is performed around the ceiling. Since water circulates, there is a risk of water leakage, and the facilities behind the ceiling are complicated and the ceiling structure is required to have strength, which is not preferable.

In particular, when cooling is performed by utilizing the radiation from the various heat mediums as described above, a part of the heat transfer body is caused by the contact of the air heat medium or the water heat medium depending on the humidity in the room. However, there is a problem in that dew condensation occurs in the cooled part. Such condensation occurs only on the surface when the heat transfer element is made of a material such as metal, while when it is made of a hygroscopic material such as a rock wool sound absorbing board, it absorbs the rock wool sound. It occurs at the metal fittings that connect the plates together.

Further, in the cooling device having the ice heat storage tank described above, cold air (for example, about 7 to 10 DEG C.) is produced by using the cooling water of about 0 to 3 DEG C. which has passed through the ice heat storage tank. Therefore, when this cold air is sent directly to the room which is the room to be cooled, there is a problem that the air volume becomes small and the agitation of the room air becomes insufficient, resulting in uneven temperature depending on the location. In particular, when the stirring is insufficient, it is expected that only the vicinity of the air outlet will be locally cooled, and the human body will be adversely affected.

The present invention was created in view of the above points, and it is possible to secure a sufficient cooling capacity,
An object of the present invention is to provide a radiant cooling system having an ice storage tank capable of realizing comfortable cooling by radiation without the risk of water leakage around the ceiling and the occurrence of dew condensation, and without complicating the ceiling structure. And

[0012]

In order to solve the above-mentioned problems, the invention of claim 1 provides a radiator of a metal material, which is provided on a ceiling surface of a room to be cooled and radiates cold heat by cooling, A cooling space provided on the back side of the radiator for cooling the radiator by introducing cooled air, and a blower for discharging the air passing through the cooling space to the room to be cooled. An air cooler that cools the fresh air or the return air from the room to be cooled by performing heat exchange between the outlet and the air using the cold water that has passed through the ice heat storage tank, and cooling by the air cooler. A duct for guiding the cooled air to the cooling space; and a mixing mechanism for mixing the cooling air discharged from the duct and the room air of the cooling target chamber in the cooling space. To do.

According to a second aspect of the present invention, in the above-mentioned first aspect of the invention, the cooling space is formed by a box body whose surfaces are each made of a heat insulating material and whose radiator side is open. And

According to a third aspect of the present invention, in the first or second aspect of the present invention, the mixing mechanism is a part of a ceiling surface of the room to be cooled, and a flow of cooling air in the cooling space. Of the indoor air of the room to be cooled through the inlet, the indoor air and the cooling air introduced into the cooling space from the duct are agitated and mixed. A blower fan to open, and only when the blower fan is rotating, to open the intake, otherwise open and close the intake,
It is characterized in that dust and the like are prevented from entering the cooling space by closing the intake port during non-operation.

Further, in a fourth aspect of the invention, in the third aspect of the invention, a dew condensation sensor is provided on the surface of the radiating body on the side of the room to be cooled, and cooling air is supplied from the air cooler to the duct. And a blower that sends out a dew condensation sensor, the amount of room air blown by the blower fan, the amount of cooling air blown by the blower,
A control device that variably controls at least one of the cooling capacities of the air by the air cooler, and prevents partial condensation on the surface of the radiator while keeping the temperature of the cooling target chamber constant. It is characterized by

[0016]

According to the first aspect of the present invention, the air is cooled by using the cold water that has passed through the ice heat storage tank, and the radiator of the metallic material provided on the ceiling surface is cooled by the cooled air. that time,
The cooling air discharged from the duct by the mixing mechanism and the room air in the room to be cooled are mixed to stir and mix the cooling air. This prevents the radiator of the metal material from being locally cooled by the cooling air, and also uses the cold heat radiated from this radiator and the cool air emitted from the air outlet after cooling this radiator. Then, the room to be cooled is cooled.

According to the first aspect of the invention, the radiator is cooled by the cold air cooled by using the ice heat storage tank, so that the radiation efficiency can be improved. Moreover, since the radiant body is cooled and the air whose temperature has risen is discharged from the air outlet and used for cooling, it is possible to secure a sufficient cooling capacity in combination with the above-described cooling by the radiant body. . Further, since the radiator is cooled by cold air, there is no risk of water leakage, and moreover, the structure above the ceiling is only for passing cold air, and there is no particular need to complicate the structure. Further, since the cooling air discharged from the duct and the room air are agitated and mixed by the mixing mechanism, the radiator of the metal material is not partially cooled, so that dew condensation due to local cooling is not generated. Can be prevented. Furthermore, the air for cooling discharged from the air outlet rises in temperature when cooling the radiator, so that it is not blown out at an extremely low temperature, and local excessive cooling can be prevented. You can
It is possible to realize comfortable cooling that also uses cooling by radiation.

According to the second aspect of the present invention, the cooling space provided on the back surface of the radiator is formed by a box body whose surfaces are made of a heat insulating material and whose radiator side is open. This cooling space can be minimized as compared with the case of introducing a cooler by insulating the entire back surface, which enables reduction of material cost and highly efficient cooling.

Further, according to the invention of claim 3, as a part of the above-mentioned mixing mechanism, an intake is provided in a part of the ceiling surface and near the upstream side of the flow of the cooling air, and the intake is opened and closed. It is provided with an opening / closing part for operating and a fan for introducing indoor air through the intake. Then, the inlet is opened by the opening / closing portion only when the blower fan is rotating, and the cooling air introduced from the duct and the room air are stirred and mixed. Thereby, the cooling air introduced from the duct does not directly hit the radiator of the metal material,
The cooling air after being stirred and mixed by the indoor air comes into contact with the back surface side of the radiator. Therefore, it is possible to prevent partial cooling of the radiator, and suppress local occurrence of surface dew condensation.

On the other hand, when the blower fan is not rotating, since the inlet is closed by the opening / closing portion, it is possible to prevent dust and the like from entering the cooling space from the indoor side through the inlet.

According to the invention of claim 4, a dew condensation sensor is provided on the surface of the radiator. When the dew condensation is detected, the control device variably controls at least one of the amount of room air blown by the blower fan, the amount of cooling air blown by the blower, and the air cooling capacity of the air cooler. In other words, by sending more indoor air,
The degree of stirring and mixing of the cooling air by the room air is further increased, and the temperature distribution of the radiator is made more uniform to prevent dew condensation. Alternatively, by increasing the blowing amount of the cooling air sent to the cooling space through the duct, the cooling air rises under the condition that the cooling capacity is constant, and the occurrence of dew condensation is prevented. Alternatively, the generation of dew condensation is prevented by changing the cooling capacity of the air by the air cooler and increasing the blowing amount of the cooling air to raise the temperature of the cooling air. These controls are performed so that the temperature of the room to be cooled becomes constant. In this way, by controlling the air flow rate including the cooling capacity, it is possible to prevent the occurrence of dew condensation and to keep the temperature of the cooling target chamber constant.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

First Embodiment FIG. 1 is a diagram showing the overall construction of a first embodiment to which a radiant cooling system having an ice heat storage tank of the present invention is applied.

As shown in the figure, the ceiling surface of the room to be cooled 10 is formed by a radiator 12 made of a metal material, and a part of the radiator 12 is opened to form an outlet 14. Also,
A box body 20 for forming a cooling space 18 is provided on the back side of the radiator 12 (on the side of the space 16 behind the ceiling). The box body 20 has an outlet 22 formed in a part thereof.
This is for introducing the cold air sent out from the cooling space 18 into the cooling space 18 and further guiding it to the air outlet 14 to the cooling target chamber 10 provided at a position apart from the air outlet 22. The radiator 12 is passed through the cooling space 18.
Is designed to be sufficiently cooled. Specifically, the box body 20 is formed by forming each surface with a heat insulating material 23 and opening the radiator 12 side, and the details will be described later.

In particular, in the radiant cooling apparatus of this embodiment, the radiator 12 is made of a metallic material, and the radiator 12 is cooled by cold air produced by using ice heat storage, which will be described later. There is a possibility that the portion that the cold air hits is locally cooled and that dew condensation occurs on the indoor surface of the radiator 12. Therefore, in this embodiment, the mixing mechanism 80 is provided to prevent the occurrence of dew condensation.

The mixing mechanism 80 is provided at a portion where a part of the radiator 12 is open, and is provided at a position apart from the above-mentioned blowout port 14 with the blowout port 22 interposed therebetween. By arranging the mixing mechanism 80 in this way, it becomes possible to stir and mix the cool air sent out from the air outlet 22 and the room air introduced from the mixing mechanism 80, and the air after stirring and mixing becomes the radiator 12. After being moved along, the air is discharged into the cooling target chamber 10 from the blowout port 14. The detailed configuration and operation of the mixing mechanism 80 will be described later.

In addition, the cooling device of the present embodiment, in order to send the cooling air to the cooling space 18 formed by the box body 20 described above, the ice heat storage tank 24, the three air conditioning chambers 26,
28 and 30 are provided.

The first air conditioning chamber 26 is for precooling the fresh air sucked through the suction port 32 formed in a part of the first air conditioning chamber 26, and is provided with a cold water coil 34 and a blower 36 for that purpose. There is. The ice water storage tank 2 is provided in the cold water coil 34.
4, cold water having a water temperature of about 0 to 3 ° C. is supplied through a cold water pipe 37, and heat is exchanged between the air sucked from the suction port 32 and the supplied cold water, thereby cooling by precooling. It is designed to get air. Then, this cooling air is sent to the supply duct 38 by the blower 36 and sent to the air conditioning chamber 30.

A three-way valve 39 is inserted in a part of a cold water pipe 37 connecting the cold water coil 34 and the ice heat storage tank 24, and a part of the cooling water warmed by passing the cold water coil 34 The cold water coil 34 is supplied to the cold water coil 34 itself through the three-way valve 39. This allows
The temperature of the cold water supplied from the ice heat storage tank 24 to the cold water coil 34 can be arbitrarily raised, and the cooling capacity of the cooling coil 34 can be variably controlled by adjusting the valve opening / closing amount of the three-way valve 39. it can.

The second air conditioning chamber 28 is dehumidified by cooling a part of the air (exhaust gas) collected through the exhaust port 40 formed in the ceiling surface or part of the wall surface of the cooling target room 10. For cold water coil 4
2 and an opening / closing valve 44.

The return air collected through the exhaust port 40 passes through the return duct 46, and a part of the return air is introduced into the third air conditioning chamber 30 through the sub duct 48. Further, a part of the return air passing through the sub duct 48 is supplied to the cold water coil 42 in the second air conditioning chamber 28 via the opening / closing valve 44. The chilled water coil 42 is supplied with chilled water discharged from the chilled water coil 34 in the air conditioning chamber 26 through the chilled water pipe 50, and a part of the return air introduced through the opening / closing valve 44 is heated to a temperature below the dew point. Cool to. As a result, the return air is partially dehumidified, and the dehumidified air is introduced into the third air conditioning chamber 30.

A three-way valve 52 is inserted in a part of a cold water pipe 50 for supplying cold water to the cold water coil 42.
The point that the cooling capacity of the cooling coil 42 can be variably controlled by partially taking in the cooling water discharged from the cold water coil 42 is the same as the case of the cold water coil 34 described above.

Further, from the exhaust port 40 to the return duct 46.
A part of the return air collected in (1) is introduced into the air conditioning chambers 28, 30 via the sub-duct 48, and the rest is discharged outside by the blower 56 via the opening / closing valve 54. In this way, while partially exhausting the return air,
By using a part of it again for cooling, we are trying to achieve both cleaning of indoor air and improvement of cooling efficiency.

In the third air conditioning chamber 30, the cooling air introduced through the first air conditioning chamber 26 and the second air conditioning chamber 28 and part of the return air introduced through the sub duct 48. Is further cooled to generate cooling air to be supplied to the cooling space 18 provided on the back surface side of the radiator 12, and includes a cold water coil 58 and a blower 60.

In the cold water coil 58, the air conditioning chamber 28
The cooling water sent from the cold water coil 42 inside is the cold water pipe 62.
Is supplied via the above-mentioned cooling water and heat is exchanged between the cold water and the air introduced through the above-mentioned three paths to cool the air. The cooled air is sent to the supply duct 64 by the blower 60. The supply duct 64 is connected to the air outlet 22 formed in a part of the box body 20 forming the cooling space 18, and the cooling air sent to the supply duct 64 is sent into the cooling space 18. It is supposed to be done.

In the cooling device of this embodiment, the air conditioning chamber 2 is cooled before the air is cooled in the air conditioning chamber 30 for sending the cooling air to the cooling space 18.
6 pre-cools fresh air, and air conditioning room 2
8 partially cools the return air. Therefore, dehumidification is performed to some extent before being introduced into the air conditioning chamber 30, and the cooling air sent from the outlet 14 to the cooling target chamber 10 becomes dry with low humidity.

FIG. 2 is a perspective view showing a concrete example in which the box body 20 is formed of a heat insulating material. The box 20 shown in FIG.
The case where the box-shaped body 20 having a U-shaped cross section is formed by bending a part of the rectangular heat insulating material 23 is shown.
Has become. In this case, a film or a metal foil for increasing airtightness is attached to at least one surface of the heat insulating material 23, and the end portion of the heat insulating material 23 and the radiator 12 are attached.
It is necessary to attach a tape for improving airtightness or apply a sealing material to the contact portion with. Further, when the heat insulating material 23 is formed of glass wool or the like, it is desirable to devise a part thereof (for example, a portion indicated by a chain line in FIG. 2) by compression in order to increase the strength.

In this way, the box body 20 is provided by the heat insulating material 23.
By forming the space and forming the interior thereof as the cooling space 18, it is possible to reduce the amount of the heat insulating material 23 used as compared with the case of thermally insulating the entire large ceiling space 16, and the cooling space 18 can be made small. By doing so, the radiator 1
The cooling efficiency of No. 2 can be increased, and cooling with high efficiency can be achieved at low cost as a whole.

FIG. 3 is a diagram showing a detailed structure of the mixing mechanism 80. FIG. 1A shows the configuration when the blower fan is placed horizontally, and FIG. 6B shows the configuration when the blower fan is placed vertically.

As shown in these figures, the mixing mechanism 80 of the present embodiment controls the intake 82 of the room air formed by opening a part of the radiator 12 and the opening / closing operation of the intake 82. Opening / closing unit 84, inlet 82 and opening / closing unit 8
4 and a blower fan 86 provided in the cooling space 18 in the vicinity thereof. The intake port 82 is composed of, for example, three rectangular window parts,
An opening / closing section 84 is provided on each cooling space 18 side. Each opening / closing part 84 is formed of a rectangular plate-shaped member, and one of its long sides is configured to rotate about a rotation axis fixed to the back side of the radiator 12. Therefore, when a negative pressure is generated in the cooling space 18 between the opening / closing part 84 and the blowing fan 86 by rotating the blowing fan 86, the opening / closing part 84 opens as shown in FIG. To be On the other hand, when the blower fan 86 is not rotating, the opening / closing part 84 closes the intake port 82 by its own weight, so that dust or the like on the indoor side does not enter the cooling space 18 via the intake port 82.

When the blower fan 86 is placed horizontally as shown in FIG. 3 (a), the flow of the indoor air taken in through the intake port 82 is restricted by the wall surface of the box body 20. Flow in the direction of arrow e. Therefore, the cool air sent out from the outlet 22 through the supply duct 64 and the room air introduced from the intake 82 are agitated and mixed, and only the cool air does not directly hit the back surface of the radiator 12. As a result, it is possible to avoid a situation in which the radiator 12 is partially cooled by the cool air and dew condensation occurs on the indoor surface of the radiator 12. Since the temperature of the indoor air introduced from the intake port 82 is higher than that of the cold air introduced through the blowout port 22, the temperature of the cold air rises by mixing the air of this high temperature. In terms of meaning, it is also effective in preventing the occurrence of dew condensation.

On the other hand, when the blower fan 86 is placed vertically as shown in FIG. 3B, the same point is obtained in which cold air and room air are mixed, but in this case, further stirring and mixing is required. The effect can be enhanced. That is, the vertically arranged blower fan 86 sends the room air almost perpendicularly (in the direction of arrow f) to the flow of the cool air sent from the outlet 22 to stir and mix the two airs.
Especially, as shown in FIG.
By providing it in the immediate vicinity of 2, it is possible to maximize the amount of air blown to the indoor side and obtain a sufficient stirring effect.
Thereby, the partial cooling of the radiator 12 is further improved, and the occurrence of dew condensation can be suppressed.

The mixing mechanism shown in FIG.
Since the intake port 82 is formed in a part of 2, it is not necessary to process the wall surface and the like, and the mixing mechanism 80 can be attached as a part of the radiator 12 at a factory or the like.

When the mixing mechanism 80 is actually provided, a filter 88 is provided in front of the blower fan 86 or the intake port 82, and cigarette smoke or dust contained in the air sucked from the indoor side by the filter 88 is provided. It is preferable to remove impurities such as.

As described above, in this embodiment, the radiator 12 is cooled by the cold air cooled by using the ice heat storage. Particularly, since the radiator 12 is made of the metal material, the radiation efficiency is improved. Can be increased. Moreover, the air whose temperature has risen by cooling the radiator 12 is cooled by the cooling target chamber 10
Since the air is discharged to the room, the air that has risen to some extent is discharged into the room, and local excessive cooling can be prevented. Moreover, since no cooling water is passed through the ceiling, there is no danger of water leakage and a simple structure is sufficient.

Further, in this embodiment, the mixing mechanism 8
The room air and the cooling air are agitated by 0, so that the cooling air introduced into the cooling space 18 does not come into direct contact with the radiator 12 of the metallic material. Therefore, the radiator 12
It is possible to avoid a situation in which the part is excessively cooled and dew condensation occurs on the indoor surface of that part. Further, the mixing mechanism 80 opens the intake port 82 only when performing the stirring / mixing operation, and otherwise closes the intake port 82 by the opening / closing section 84, so that the cooling space is not operating. It is possible to prevent dust and the like from entering the 18 from the indoor side.

Second Embodiment Next, a cooling device according to a second embodiment of the present invention will be described.

In the cooling device of the second embodiment, a dew condensation sensor is provided on the surface of the radiator 12, and the entire cooling device is controlled according to the output of this sensor to prevent dew condensation occurring on the surface of the radiator 12. There is a feature in doing it.

FIG. 4 is a diagram showing the structure of the cooling device of the second embodiment, and shows a part of the structure of the first embodiment shown in FIG. 1 and the structure added in this embodiment. .

In the figure, the dew condensation sensor 70 is the radiator 1.
It is provided on the surface of No. 2 and is for detecting whether or not dew condensation occurs at these installation positions. For example, the occurrence of dew condensation is detected by the change in electrical resistance at the installation position.

FIG. 5 is a diagram showing an example of a mounting position of the dew condensation sensor 70. In the present embodiment, the cooling air sent from the outlet 22 into the cooling space 18 is the cooling target chamber 1
Since the air is agitated and mixed by the indoor air introduced from 0, the radiator 12 located directly below the air outlet 22 is not always the coolest. Therefore, it is necessary to set the attachment position of the dew condensation sensor 70 in consideration of the flow path of the cooling air. FIG. 1A shows a case where the degree of stirring and mixing is light, and in this case, a dew condensation sensor is provided between the air outlet 14 and the air outlet 22 toward the indoor side and near the air outlet 22. 70
Is attached. Further, FIG. 2B shows a case where the degree of stirring and mixing is strong. In this case, the dew condensation sensor 70 is attached at a position slightly closer to the blowout port 14 toward the indoor side according to the degree of stirring and mixing. To be Further, FIG. 7C shows a case where the degree of stirring and mixing changes, and a plurality of dew condensation sensors 70 are attached in consideration of this changing range. In this case, one of the dew condensation sensors 70
When the dew condensation is detected, the control described later is performed.

Further, when the controller 72 shown in FIG. 4 detects the surface dew condensation of the radiator 12 according to the output of the dew condensation sensor 70, it changes the air volume / temperature of the cooling air or the air volume of the indoor air to be introduced. Control. Although it is easy to prevent dew condensation by raising the cooling temperature, it is not preferable that the set temperature changes depending on the presence or absence of dew condensation. Therefore, dew condensation occurs while the room temperature of the cooling target room 10 is kept constant. Need to be suppressed. Specifically, the control device 72 that has detected the occurrence of dew condensation raises the indoor air blowing ability of the blower fan 86 and raises the cooling ability of the cold water coil 58, increases the cooling air blowing ability of the blower 60, and blowers. Control is performed such that the cooling air blowing capacity of 60 is increased and the cooling capacity of the cold water coil 58 is decreased or increased.

According to the control of (1), by increasing the rotation speed of the blower fan 86, a large amount of room air is taken in and the degree of stirring and mixing with the cooling air is strengthened. Therefore,
The radiator 12 is also cooled uniformly, and the generated dew condensation disappears again. It should be noted that the temperature inside the cooling space 18 rises only by increasing the intake amount of the indoor air, and the indoor temperature cannot be kept constant. Therefore, at the same time, the controller 72 increases the cooling capacity of the cooling coil 58. Control is performed to keep the room temperature constant. The cooling capacity of the cooling coil 58 can be variably controlled by opening / closing the three-way valve 68, and the above-described control is performed by closing the three-way valve 63 by the control device 72.

According to the control of, the cold water coil 58
The blower capacity of the blower 60 is increased while keeping the cooling capacity by the constant. Therefore, the amount of cooling air delivered from the outlet 22 increases and its temperature rises. Therefore, the temperature after mixing the cooling air and the room air also rises, and the dew condensation generated on the surface of the radiator 12 disappears again. Even if the temperature of the cooling air sent out from the air outlet 22 rises, the air volume increases, so that the cooling capacity as a whole can be kept substantially constant, and as a result, the cooling target room 1
A room temperature of 0 is kept constant.

In the control of, the cooling target room 10 is controlled by variably controlling the cooling capacity of the cooling coil 58 when the room temperature fluctuates due to the above-mentioned control.
This is done when the indoor temperature inside is kept constant.
When the indoor temperature of the cooling target room 10 is lowered by increasing the air volume of the blower 60, the temperature of the cooling water supplied to the cold water coil 58 is raised by lowering the cooling capacity by opening the three-way valve 63. , This keeps the room temperature constant. On the contrary, when the room temperature rises, the three-way valve 63 is closed to close the cooling coil 5.
The temperature of the cooling water supplied to No. 8 is lowered, thereby increasing the cooling capacity and keeping the room temperature constant.

The above-mentioned control of and is not limited to the case where the blower 60 and the three-way valve 63 in the air conditioning chamber 30 are controlled, and the blower 36 and the three-way valve 39 in the air conditioning chamber 26 are controlled. Good.

As described above, in the cooling device of the present embodiment, the occurrence of dew condensation is detected by the dew condensation sensor 70 on the surface of the radiant body 12, particularly at the portion where the temperature may be the lowest, at the portion where the temperature becomes the lowest. When dew condensation occurs, the controller 72 variably controls the air volume of the indoor air or the cooling air or the cooling capacity of the cold water coils 58 and 34, thereby increasing the temperature of the dew condensation occurrence location and reducing the dew condensation. Can be prevented. On the other hand, the temperature of the cooling air fluctuates during the above-described control, but control such as increasing the air volume is performed and the room temperature is kept constant.

As described above, according to the present embodiment, it is possible to keep the room temperature always constant and to surely suppress the generation of dew condensation, and it is possible to realize a comfortable cooling that also uses radiation cooling.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention.

For example, in the above-described embodiment, the cooling space 18 is formed by installing the box body 20 in a part of the ceiling space 16, but the entire ceiling space 16 is cooled. Alternatively, one or a plurality of boxes 20 may be formed corresponding to a part of the ceiling. In particular, when the space 16 behind the ceiling is narrow, it is not always necessary to install the box body 20 in a part thereof, and the heat insulating material 23 may be provided on the entire wall surface of the space 16 behind the ceiling.

Further, in the above-mentioned embodiment, the case where the air outlet 14 for the indoor side is provided in a part of the ceiling and the exhaust port 40 is provided in a part of the wall surface has been described as an example. May be formed on a part of the wall surface or the exhaust port 40 may be formed on a part of the ceiling.

Further, in the above-mentioned embodiment, the flat radiator 12 is considered, but it may be in the form of an uneven plate having a large surface area in order to increase the radiation efficiency. In this case, it is necessary to take measures such as forming concave and convex grooves along the air flow so as not to block the flow of the cooling air.

In the above-described embodiment, the room air is mixed by the mixing mechanism 80 having the configuration shown in FIG. The introduced cooling air and the room air are mixed, and the mixed air is used as the cooling space 1
8 may be released.

[0064]

As described above, according to the present invention, the radiator is cooled by the cold air cooled by using the ice heat storage tank, and the radiation efficiency can be improved. Moreover,
Since the radiant body is cooled and the air whose temperature has risen is discharged from the air outlet to be used for cooling, a sufficient cooling capacity can be secured in combination with the above-described cooling by the radiant body.

Since the radiator is cooled by cold air, there is no risk of water leakage, and the ceiling only needs to have a structure for passing cold air, and there is no particular need to complicate the structure.

Further, since the cooling air discharged from the duct and the room air are stirred and mixed, the radiator of the metal material is not partially cooled, so that dew condensation due to local cooling is generated. Can be prevented.

Further, the cooling air discharged from the air outlet rises when cooling the radiator, so that it is not blown out at an extremely low temperature, and local excessive cooling is prevented. Therefore, it is possible to realize a comfortable cooling that also uses cooling of radiation.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a first embodiment to which a radiation type cooling device having an ice heat storage tank of the present invention is applied.

FIG. 2 is a perspective view showing a specific example in the case of forming a box solid with a heat insulating material.

FIG. 3 is a diagram showing a detailed configuration of a mixing mechanism.

FIG. 4 is a diagram showing a configuration of a cooling device according to a second embodiment. .

FIG. 5 is a diagram showing an example of a mounting position of a dew condensation sensor.

[Explanation of symbols]

 10 Cooling target room 12 Radiant body 14,22 Air outlet 18 Cooling space 20 Box body 23 Insulation material 24 Ice heat storage tank 34,42,58 Cold water coil 36,60 Blower 38,64 Supply duct 70 Condensation sensor 72 Control device 80 Mixing Mechanism 82 Intake 84 Opening / closing part 86 Blower fan

Claims (4)

(57) [Claims] 1. A radiant body made of a metal material, which is provided on a ceiling surface of a cooling target room and radiates cold heat by cooling, and a radiant body provided on a back surface side of the radiant body, by introducing cooled air. Heat exchange between the cooling space for cooling the body, the air outlet for discharging the air passing through the cooling space to the room to be cooled, and the air using the cold water passing through the ice storage tank. By performing an air cooler that cools the fresh air or the return air from the cooling target chamber, a duct that guides the air cooled by the air cooler to the cooling space, and in the cooling space, A radiant cooling apparatus having an ice heat storage tank, comprising: a mixing mechanism that mixes the cooling air discharged from the duct with the room air of the cooling target room. 2. The radiant cooling apparatus having an ice heat storage tank according to claim 1, wherein each of the cooling spaces is formed by a box body whose surfaces are made of a heat insulating material and whose radiator side is open. . 3. The mixing mechanism according to claim 1, wherein the mixing mechanism is a part of a ceiling surface of the cooling target chamber and is provided near an upstream side of a flow of cooling air in the cooling space. An inlet, a blower fan that sucks indoor air of the cooling target chamber through the intake port, and agitates and mixes the indoor air and the cooling air introduced into the cooling space from the duct, and the blower fan is By opening and closing the intake port only when rotating, and closing the intake port otherwise, by closing the intake port when not operating,
A radiant cooling device having an ice heat storage tank, characterized in that dust and the like are prevented from entering the cooling space. 4. The dew condensation sensor according to claim 3, wherein the dew sensor is provided on a surface of the radiator that faces the cooling target chamber, a blower that sends cooling air from the air cooler to the duct, and the dew sensor. A controller for variably controlling at least one of the amount of room air blown by the blower fan, the amount of cooling air blown by the blower, and the cooling capacity of air by the air cooler when dew condensation is detected by The radiation-type cooling device having an ice heat storage tank, further comprising: preventing the partial condensation on the surface of the radiator while keeping the temperature of the cooling target chamber constant.