JP3061433B2 - Ceiling cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system provided on a ceiling which uses both radiation and convection cooling as a cooling function and also has a dehumidifying function.

[0002]

2. Description of the Related Art In recent years, indoor living environments have been improved due to the development of cooling systems. As a result, it is possible to comfortably live and work, work efficiency is improved in offices, workplaces, schools, and the like, and it is indispensable for customer service in shops and restaurants. .

[0003] Such a cooling system aims to obtain a comfortable indoor state by removing heat from the room.
The amount of heat to be removed from this room (hereinafter referred to as cooling load)
Can be roughly divided into the following four.

[0004] (1) Heat entering by solar radiation from the sun (2) Heat entering through walls and roofs because the temperature outside is higher than indoors; (3) Heat coming from indoors due to lighting, human body or equipment, etc. Heat (4) Amount of heat for cooling fresh air to be taken. These heats include sensible heat, which is heat for increasing the ambient temperature, and latent heat, which is heat given to the air as moisture. By removing both the sensible heat and the latent heat from the room, that is, by performing cooling and dehumidification, a comfortable state is obtained.

The following system is known as a cooling system for removing such a cooling load.

That is, in a system such as a fan coil unit in which a blower is installed at an appropriate place in a room, the room air is sucked in, the heat in the air is absorbed by a refrigerant to perform cooling, and the cooled air is further forced to blow air. Cooling is done by doing.

[0007] However, in this system, a part of the indoor space is occupied to install the blower in the room, and there is a problem that the living space is narrowed. Further, forced air blowing by a blower causes noise, generates an airflow that gives an unpleasant feeling of cooling, and further causes discomfort to the human body such that the floor surface is overcooled compared to the upper part of the room. This has an effect on health and has recently become a problem as cooling disease.

For this reason, there has been provided a cooling system provided on the ceiling, which does not perform forced air blowing and uses cold radiation. As this system, the following two types of systems are known.

In the first system, a cooling pipe embedded in a ceiling panel is horizontally installed on a ceiling surface.
Water cooled to about 18 ° C. by the refrigerator is passed through the cooling pipe. This cooling water lowers the surface temperature of the ceiling panel and cools the room to cool the room. At this time, since the surface temperature of the ceiling panel is higher than the indoor dew point in summer, dew condensation does not occur on the ceiling panel.

On the other hand, a second system is disclosed in
One such as shown in US Pat.

That is, in this system, a coil whose both ends are connected to a refrigerator is installed horizontally at a ceiling position in a room. Water cooled to about 7 ° C. by a refrigerator is passed through the inside of the coil. With the coil cooled by the cooling water, the air around the coil exchanges heat and becomes cooling air. Convection occurs due to the temperature difference between the cooling air and the air below the room, and the room is cooled by the convection cooling and the cooling radiation from the ceiling coil surface. When the air cooled by the ceiling coil falls below the dew point temperature, the water vapor in the air is condensed there and condensation occurs. Therefore, since the surface temperature of the cooled coil of the second system is lower than the dew point temperature of the room air, the water vapor contained in the cooled air is condensed to form dew, and the absolute humidity decreases. In addition, since the air around the coil flows by convection, the water vapor contained in the indoor air is gradually condensed. That is, in this system, when cooling, dehumidification can also be performed.

[0012]

However, each of these systems has a problem that needs to be solved.

That is, in the first system, the humidity in the air, that is, the latent heat does not decrease because dew condensation does not occur, and therefore, a dehumidifier must be provided separately. Further, since the cooling temperature cannot be lowered in order to avoid dew condensation, the cooling capacity is often insufficient in a limited space of the indoor ceiling.

On the other hand, in the second system, dehumidification is performed by the formation of dew. However, it is necessary to collect the dehumidified water. For this purpose, a drain pan connected to a drain pipe must be provided below the cooling coil. Providing this is not good for the appearance of the ceiling, and impairs the aesthetics of the room.

The present invention has been provided to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide a ceiling-mounted cooling system by combining convection cooling and cooling radiation. A cooling system that does not cause any discomfort to the human body and that exerts appropriate cooling capacity against complicated cooling loads, can adjust indoor temperature and humidity, and does not impair the appearance of the ceiling surface It is to provide.

[0016]

According to the first aspect of the present invention,
In a cooling system provided on the ceiling, a cooling pipe that is provided above the ceiling surface and passes low-temperature cooling water that causes dew condensation around the cooling pipe, and a drain pan that is provided under the cooling pipe for receiving dew condensation, Installed on the ceiling surface,
A ceiling panel provided with a cooling pipe through which cooling water having a temperature that does not cause condensation is provided, and a ventilation port provided in the ceiling panel for convection of cooled air in the room.

According to a second aspect of the present invention, a ceiling panel provided in the ceiling cooling system according to the first aspect is formed so as to double as a drain pan of a cooling pipe.

[0018]

In the ceiling cooling system according to the first aspect of the present invention, cooling water having a water temperature lower than the indoor dew point is passed through a cooling pipe provided above the ceiling surface, and the heat is exchanged. The air is cooled and the room is cooled by convection cooling, and at the same time, dehumidification is also performed by condensation. This condensation is drained by a drain pan provided below the cooling pipe. On the other hand, a ceiling panel is provided on the ceiling surface below the drain pan, and the temperature of the ceiling panel is lowered by passing cooling water with a water temperature slightly higher than the indoor dew point temperature through a cooling pipe provided inside the ceiling panel. The room is cooled by the cool radiation.

In the ceiling cooling system according to the second aspect, the ceiling panel is formed in a U-shape, so that the ceiling panel also serves as a drain pan for draining condensation of the cooling pipe.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a ceiling cooling system according to the present invention will be described below with reference to FIGS.

That is, as shown in FIG. 1, cooling pipes 1 through which cooling water flows are provided at predetermined intervals in a horizontal direction above a ceiling in a room to be cooled. A ceiling panel 2 having a cooling pipe 3 therein is provided at a position serving as a ceiling below the ceiling panel, and is formed in a U-shape which is opened upward. The ceiling panel 2 is formed of a water-resistant member, is disposed immediately below the cooling pipe 1 at regular intervals along the cooling pipe 1, and has an upper surface connected to a drain pipe (not shown) as a drain pan. A removable louver 4 is mounted in the space between the ceiling panels 2. The cooling pipe 1 and the cooling pipe 3 of the ceiling panel 2 are provided in parallel with a chiller system provided with a chiller 5 and a heat exchanger 6 as shown in FIG. It is connected.

The operation of the ceiling cooling system of the present invention configured as described above is as follows. That is, the cooling water cooled to about 7 ° C. by the water cooler 5 is sent to the cooling pipe 1 by the pump 7, and heat exchange of the cooling water causes the cooling pipe 1 to cool.
The surrounding air is cooled. This cooling air flows out of the louver 4 between the ceiling panels 2 provided at the lower portion of the cooling pipe 1, and natural convection occurs due to a temperature difference with air below the room, and the room is cooled by the convection. . At this time, the water vapor contained in the air around the cooling pipe 1 is condensed to form dew and dehumidify. The condensation at this time falls on a ceiling panel 2 provided below the cooling pipe 1. This ceiling panel 2 is formed in a U-shape with a waterproof member,
Further, since this upper surface is connected to a drain pipe, it also has a function as a drain pan.

On the other hand, the cooling pipe 3 of the ceiling panel 2 is connected to a cooling water system of about 7 ° C. and cooling water of about 18 ° C. through a heat exchanger 6.
Cooling water adjusted to ° C. is flowed by the pump 8. This cooling water lowers the surface temperature of the ceiling panel 2 and performs indoor cooling by cool radiation.

By the way, since the louver 4 is detachably provided, the upper surface used as a drain pan of the ceiling panel 2 can be cleaned, and can also be used for checking a cooling system.

According to the ceiling cooling system of the present embodiment as described above, the room is cooled by the cold radiation from the ceiling panel 2 on the ceiling surface and the convective cooling air generated by the heat exchange of the cooling pipe 1. When dew condensation occurs in the cooling pipe 1, indoor dehumidification is performed. That is, a comfortable environment can be created by a cooling radiation effect in addition to a sufficient cooling capacity and a dehumidifying function. In particular, the temperature difference between the upper and lower parts is small due to the cool air due to natural convection from the upper part, and an airflow that gives an unpleasant cool feeling due to forced air blowing can be prevented, and the degree of comfort felt by the human body is considerably higher than before.

Further, since the ceiling panel 2 also functions as a drain pan of the cooling pipe 1, there is no need to install a drain pan. Further, since the cooling pipe 1 is not seen by the ceiling panel 2 and the louver 4, the indoor beauty can be improved. Can be kept.

Note that the present invention is not limited to the above-described embodiment, and specific shapes of the respective members, or respective mounting positions and methods can be appropriately changed.

For example, the cooling water temperature is about 7 ° C. and about 18 ° C.
It is not limited to this, and can be changed by the cooling load. Also, by detecting the cooling load with a sensor, for example, by setting the temperature of the water passed through the cooling pipe of the ceiling panel to a temperature that is about 2 degrees higher than the room dew point temperature at that time, an appropriate cooling without dew condensation can be achieved. Radiation can be obtained.

The cooling pipe and the cooling pipe of the ceiling panel are not limited to being connected in parallel, but may be used in series via an appropriate temperature control device. Furthermore,
Depending on the cooling load at that time, either convection cooling or cooling radiation can be used.

Further, fins such as spiral fins and plate fins can be provided on the cooling pipe. As a result, the conduction surface can be enlarged, and heat exchange can be performed efficiently.

By providing a separate drain pan below the cooling pipe, the shape of the ceiling panel is not limited to a U-shape. This can increase the durability of the ceiling panel, although it costs more for installing the drain pan.

[0032]

According to the ceiling cooling system of the present invention, it has both cooling radiation and convection cooling without forcibly blowing air, has sufficient cooling capacity and dehumidifying function, and has a room temperature lower than that of the conventional system due to the cooling radiation effect. A comfortable feeling can be obtained even if the height is increased, so that a healthy and comfortable environment for humans can be created.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of a ceiling cooling system of the present invention.

FIG. 2 is a circuit diagram of the ceiling cooling system of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 cooling pipe 2 ceiling panel 3 cooling pipe 4 louver 5 water cooler 6 heat exchanger 7, 8 pump

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F 5/00 F24F 1/00

Claims (2)

(57) [Claims] In a cooling system provided on a ceiling, a cooling pipe is provided above a ceiling surface and through which low-temperature cooling water causing condensation is formed, and a condensation pipe provided below the cooling pipe is provided. Panel, and a ceiling panel provided on the ceiling surface with a cooling pipe through which cooling water with a temperature that does not cause condensation is provided inside the ceiling panel, and ventilation provided on the ceiling panel to convect the cooled air indoors A ceiling cooling system, comprising: a mouth; 2. A ceiling cooling system according to claim 1, wherein a ceiling panel provided in the ceiling cooling system according to claim 1 is formed so as to also serve as a drain pan of a cooling pipe.