JPH04268140A - Ceiling cooling and heating system - Google Patents

Abstract

PURPOSE:To eliminate not only a heat source or cooling or heating but also a heat source for dehumidification by a method wherein a part of a circulating flow of cold air or hot air is discharged through an inflow port or an outflow port to a room. CONSTITUTION:A ceiling duct 7 is formed to a ceiling part by using a ceiling plate 1 and a lamination plate 8 being a plate, and an inlet 13 or an outlet 14 of a flow passage 10 of the ceiling duct 7 is interconnected through a duct 12 in which an air compressor 6 is located. The ceiling duct 7 having the flow passage 10 with a height of a few cm is formed of the lamination plate 8 and the ceiling material 1. The two similar ceiling ducts 7 are installed in juxtaposition, and the inlet 13 and the outlet 14 of each ceiling duct 7 are connected to an air compressor being a heat source and having a dehumidifying function through the duct 12. An air inflow port and an air outflow port, e.g. a slit or a through-hole, are formed in a ceiling surface. The interior of a room is dehumidified in a way that a part of a circulating air flow is discharged in a room therethrough, low humidity air is discharged in a room, and high humidity indoor air is recovered.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling radiant air conditioning system that cools or heats a ceiling surface to cool or heat a room.

0002

2. Description of the Related Art A conventional ceiling radiation heating and cooling system is shown in FIG.

[0003] When cooling water from a heat source 16 such as a heat pump or heated water is supplied by a pump 15 to a steel pipe 17 piped inside the ceiling slab 4, and the ceiling surface temperature is set to 20. The room temperature is heated and cooled by setting the temperature to about 35°C, or about 35°C for heating purposes.

[0004] As another example, Utility Model Application Publication No. 01-22918
There is a system as shown in Figure 6 shown in the issue. this is,
Piping 1 exposed above the lattice ceiling material 1 serving as the ceiling surface
7, and cold water or hot water is flowed through this piping to perform air conditioning and heating in the same way as the system shown in FIG.

[0005] Such heating and cooling systems that utilize heat transfer through radiation from the ceiling surface can provide comfortable indoor conditions by making it difficult to generate unpleasant air currents and by minimizing the difference in temperature distribution between the top and bottom of the room. Can be done.

[0006]

[Problems to be Solved by the Invention] However, in the conventional ceiling heating/cooling system, it is necessary to dehumidify by some method to prevent dew condensation on the ceiling surface during cooling, and a dehumidifier is usually used. In other words, in addition to the heat source for cooling,
Many had unreasonable systems that required an additional heat source for dehumidification.

Compared to the conventional example where water is used as a heating medium for ceiling cooling and heating, the specific heat of air is smaller than that of water. It is necessary to either increase the temperature significantly, or to create an environment where the temperature difference between the room temperature and the ceiling surface temperature is small.

[0008] Therefore, it is generally believed that air heating medium is not suitable for ceiling cooling. Therefore, the inventors set the thermal resistance per unit area of the ceiling material of the ceiling heating and cooling system to 0.0.
We have found that a solution can be achieved by setting the temperature to 1 m2/K/W or more and 0.2 m2/K/W or less, and circulating air cooled or heated by a heat source such as a heat pump on the back side of the ceiling material. However, when performing air conditioning, it is necessary to dehumidify the room by some method to prevent dew condensation on the ceiling surface.

An object of the present invention is to provide a ceiling heating and cooling system that does not require a separate heat source for dehumidification during cooling.

0010

[Means for Solving the Problems] The ceiling heating and cooling system of the present invention uses ceiling materials and flat plates in the ceiling of a building to extend several cm.
A ceiling duct is formed by appropriately insulating the back surface of the flat plate, and the air inlet and outlet of the ceiling duct are connected by a duct via a heat source such as a heat pump and a blower, and cold or warm air is This is a ceiling heating and cooling system that performs ceiling heating and cooling by circulating air, and has an air inlet and an air outlet on the ceiling surface made of the ceiling material, and a part of the circulating flow of cold or warm air is sent indoors through the inlet and outlet. This is a ceiling air conditioning/heating system that blows air into the ceiling, and the ceiling surface temperature is preferably set to about 20°C when the purpose is cooling, and preferably about 35°C when the purpose is heating. This is what we do.

[0011]

[Function] According to the ceiling heating and cooling system of the present invention, air inlets and air outlets such as slits or through holes are formed in the ceiling surface so that a part of the circulating air flow is blown into the room. Blows low-humidity air into the room,
Indoor dehumidification is performed by recovering high-humidity indoor air.

The amount of air blown into the room is not particularly limited, but it is preferably 30% or less of the circulating air flow rate, and more preferably about 10%.

[0013] Since the present invention uses air as a heat medium, the structure can be much simpler than when water is used as a refrigerant, such as by providing a heat pump. Furthermore, since the ceiling material is the only radiant surface that increases heat capacity, the heat capacity is small and cooling or heating starts quickly.

[0014]

Embodiments Examples of the present invention are shown in FIGS. 1 to 4.

The specific contents of these embodiments will be described below, but the present invention is not limited to the following description unless it departs from the spirit thereof.

-Example 1- In this example, a ceiling duct 7 is formed in the ceiling of an 8-tatami room using a ceiling material 1 and a flat plywood 8, as shown in FIGS. 1 and 2. The inlet 13 and outlet 14 of the flow path 10 of No. 7 are connected by a duct 12 via an air conditioner 6.

Ceiling material 1 is a rock wool ceiling material with aluminum laminate attached to the surface (thermal resistance per unit area is 0).
．． 15 m2 K/W, thickness 12 mm) was used.

In this system, as shown in FIG. 1(b), a ceiling duct 7 having a flow path 10 with a height of 2 cm is formed using a discarded plywood board 8 and a ceiling material 1, and has a width of 4 cm and a height of 2 cm.
A field edge 9 of cm 2 is installed parallel to the flow and used as a partition between each flow path 10 and a spacer between the sacrificial adhesive 8 and the ceiling 1.

Headers 11 are provided at the inlet and outlet portions of the ceiling duct 7, respectively. FIG. 2 shows details of the connection between the ceiling duct 7 and the air conditioner 6, which is a heat source.

Two similar ceiling ducts 7 are arranged in parallel, and the inlet 13 and outlet 14 of each ceiling duct 7 are connected by a duct 12 to an air conditioner which is a heat source and has a dehumidifying function.

Since the cross-sectional area of the header 11 is sufficiently large, the pressure loss in the header 11 portion is sufficiently smaller than the pressure loss in the flow path portion.

[0022] Therefore, the flow velocity of cold air or warm air in each flow path 10 is approximately uniform. In this example, air is blown into the room with a width of 5 mm and a length of 30 cm, as shown in Figure 3.
As shown in the figure, 8 slits 18 are arranged in parallel on opposite sides of the rectangular ceiling surface to form a total of 16 slits, and the slit 18 on one side is used as an air inlet, and the slit 18 on the other side is
serves as an air outlet. The amount of circulating air flowing through the heat source (air conditioner) 6 in this way is 600 m3/h.
It was designed to go in and out of the room through the slit 18.
In a cooling experiment conducted indoors with an average ceiling surface temperature of 22°C during the daytime in summer (temperature 32°C, humidity 60% RH), an indoor environment with an indoor temperature of 28°C and humidity of 50% was obtained. No condensation occurred on the ceiling surface.

- Example 2 - In a system similar to the experimental apparatus used in Example 1, a through hole 19 (diameter 10 mm) was used as an air outlet and air inlet.
An experiment was conducted by forming a large number of wafers on opposite sides of a rectangular ceiling surface as shown in FIG.

The amount of air flowing into the room from the through hole 19 is equal to the amount of air passing through the heat source (air conditioner) 6 as in the first embodiment.
60 m3/h, which is approximately 10% of 00 m3/h
The number of through holes 19 is adjusted so that

[0025] Summer daytime (temperature 32°C, humidity 60%R)
In the cooling experiment conducted indoors with an average ceiling surface temperature of 22°C in H), the indoor temperature was 28°C and the humidity was 50%.
An indoor environment was obtained, and no condensation occurred on the ceiling surface.

[0026]

[Effects of the Invention] According to the ceiling heating and cooling system of the present invention,
There is no need to use a separate dehumidifier to prevent condensation on the ceiling when cooling or heating. In other words, the ceiling heating and cooling system does not require a heat source for dehumidification in addition to a heat source for cooling or heating.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are cross-sectional views showing one embodiment of the present invention, and FIG. 1(b) is an enlarged view of the main part of FIG. 1(a).

FIG. 2 is a perspective view of the same as above.

FIG. 3 is a plan view of the same as above.

FIG. 4 is a plan view showing another embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional example.

FIG. 6 is a perspective view showing a conventional example.

[Explanation of symbols]

1 Ceiling material 2 Attic space 3 Indoor 4 Slab 5 Insulation material 6 Air conditioner (indoor unit) 7 Ceiling duct 8. Discarded plywood 9 Wild edge 10 Flow path 11 Header 12 Duct 13 Air inlet 14 Air outlet 15 Pump 16 Heat source 17 Copper tube 18 Slit 19 Through hole

Claims (1)

[Claims] Claim 1: A flow path several cm high is formed in the ceiling of a building using a ceiling material and a flat plate, the back of the flat plate is properly insulated to form a ceiling duct, and the air inlet and outlet of the ceiling duct are connected. In a ceiling heating and cooling system that performs ceiling heating and cooling by circulating dehumidified cold or warm air by connecting a heat source such as a heat pump and a blower with a duct, the ceiling surface has an inlet and an outlet for air to flow into the room.
A ceiling heating and cooling system that blows part of the circulating flow of cold air or warm air into a room.