JPH0544578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for preventing dew condensation at an outlet for preventing water droplets from forming at an outlet for conditioned air.

[Conventional technology]

Air outlets are installed on ceilings, walls, etc. to blow out conditioned air indoors, etc., but most ceiling air outlets are usually air outlets with a face frame, such as an anemo type air outlet. . In addition to general buildings, such air outlets are also installed in railway station buildings, airport terminal buildings, department stores, etc., and because these buildings have a high number of people coming and going,
The air conditioning outlet near the inlet is affected by outside air, causing condensation on the face frame of the outlet.
The problem of water droplets falling on people, products, or terminals for selling tickets such as computers is frequently occurring.

Therefore, in order to prevent such condensation, the blowing airflow of conditioned air is made uniform to prevent outside air from being drawn in, and dew condensation prevention tape is attached to the surface of the face frame.

[Problem that the invention seeks to solve]

However, with such conventional countermeasures, for example, even if the blowout airflow is made uniform, it cannot counteract the disturbance caused by intruding outside air and condensation occurs, and the application of anti-condensation tape also makes it difficult to ensure that the insulation material is sufficiently thick. Therefore, when used for a long time, the face frame is cooled by conditioned air and reaches the dew point relative to the incoming outside air.
In the end, there was a problem with condensation.

This invention was made in view of these conventional problems.The face frame is provided with a heating means such as an electric heater, and the power of the heating means is turned on and off according to the rise and fall of the temperature of the face frame. It is an object of the present invention to solve the above-mentioned problems by providing a method and a device for the same.

[Means for solving problems]

This invention provides a heating means in the face frame of a conditioned air outlet, and measures the dew point temperature of indoor air near this outlet and the temperature of conditioned air in a duct that supplies conditioned air to the outlet. When the measured temperature of the conditioned air reaches the dew point temperature, the power to the heating means is turned ON, and when the temperature does not reach the dew point temperature, the power to the heating means is turned OFF, thereby keeping the temperature of the face frame constant. As an invention of a method for preventing dew condensation that maintains the dew point temperature above the dew point temperature, and a device used when carrying out this method, a heating means provided on a face frame of a conditioned air outlet and a dew point temperature of indoor air near the outlet are provided. a dew point temperature detector that detects the temperature of the conditioned air in the duct that supplies conditioned air to the outlet; and a temperature sensor that detects the temperature of the conditioned air in the duct that supplies conditioned air to the outlet, This is a dew condensation prevention device equipped with a temperature difference controller that turns on and off the power of the heating means provided in the air conditioner.

[Effect]

A dew point temperature sensor detects the dew point temperature of the air by detecting the temperature and humidity of the air, and the dew point temperature on the indoor side near the conditioned air outlet is detected. Detects the temperature of conditioned air in the duct that supplies conditioned air. These detected temperature values are then input to a temperature difference controller and compared, and as a result, when the conditioned air temperature approaches or reaches the dew point temperature, the heating provided in the face frame by the temperature difference controller is When the power of the means is turned on and the face frame is heated, and the face frame temperature rises above the dew point temperature due to heating, dew condensation no longer occurs on the face frame. Furthermore, as a result of the above comparison, since no condensation occurs on the face frame while the conditioned air temperature has not reached the dew point temperature, the power supply for the heating means is controlled by the temperature difference controller.
Maintained in OFF state.

〔Example〕

The present invention will be explained below based on the drawings. 1 to 3 are diagrams showing an embodiment of the present invention.

In the figure, 1 indicates an indoor room of a building, and 2 is a duct provided in the ceiling 1a for supplying conditioned air to this room. Reference numeral 3 denotes a conditioned air outlet, which is an anemo type in this embodiment.
Reference numeral 3a denotes a face frame of this outlet, and 4 an electric heater (a surface heating type in this embodiment) as a heating means attached to this face frame, which is connected to a temperature difference controller 6 via a transformer 5. controlled. 7
is a dew point temperature detector attached to the ceiling 1a near the air outlet 3, which detects the temperature and humidity of the indoor air near the air outlet 3, detects the dew point temperature based on that value, and uses this detected value as 8 is a temperature sensor attached to the duct 2, which detects the temperature of the conditioned air in the duct 2 and sends the detected value to the temperature difference controller 6. It's summery.

FIG. 3 is a broken perspective view showing details of the electric heater 4 as a heating means, which is called a surface heating type. 4a is a conductive wire, and 4b is a self-regulating resistor which is a heating element and forms a parallel circuit heater, which has the characteristic of always keeping the amount of heat generated per unit length constant. 4c is a covering body that covers and insulates the heating element 4b. The electric heater 4 is attached along the periphery of the face frame 3a as shown in FIG. 2, and is connected to a power source via a transformer 5.

Now, when outside air A is blown into the air-conditioned room 1 through the opening 1b due to people coming in and going out, etc., the temperature of the surface of the face frame 3a, that is, the temperature of the conditioned air blown out from the face frame 3a, will change to the outside air A. When the dew point temperature of the indoor air in the vicinity of the disturbed face frame 3a is lowered to the dew point temperature, water vapor in the air condenses to form water droplets 9 at the edges of the face frame 3a. However, at this time, the face frame 3a
The dew point temperature of the nearby indoor air is determined by the dew point temperature detector 7.
is constantly input to the temperature difference controller 6 by
On the other hand, since the temperature of the conditioned air is similarly input to the temperature difference controller 6 by the temperature detector 8 provided in the duct 2, the temperature controller 6 constantly compares these two temperature signals. If the conditioned air temperature reaches the dew point temperature, the electric heater 4 is turned on via the transformer 5 and the face frame 3a is turned on.
By heating and raising the temperature, condensation is prevented from forming on the face frame 3a, and since condensation will not occur unless the temperature of the conditioned air reaches the dew point temperature, the electric heater 4 is turned off. It is maintained.

With the above configuration, the face frame 3a is heated by the electric heater 4 only when necessary, so that dew condensation is always prevented.

Figures 4 to 6 show other types of conditioned air outlets; Figure 4 is a nozzle type outlet, and Figure 5 is a nozzle type outlet.
The VHS type air outlet and the one shown in FIG. 6 are a breeze line type air outlet, both of which were equipped with the electric heater 4 used in the previous embodiment along the periphery of the end, and equipped with a temperature control device similar to that of the previous example. It is something.

〔Effect of the invention〕

As described above, according to the present invention, water droplets are prevented from falling from the outlet near the entrance of a department store or store, and products, etc. can be laid out freely. In addition, unhygienic problems caused by condensation in restaurants and the like with high humidity can be solved. In addition, various effects can be obtained in places where moisture is averse, such as computer rooms and electrical equipment rooms.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment according to the present invention, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a cutaway perspective view showing the configuration of an electric heater as heating means,
Figures 5 and 6 illustrate various types of conditioned air outlets. 1... Chamber, 2... Duct, 3... Air outlet, 3a
... face frame, 4 ... heating means (electric heater),
6... Temperature difference controller, 7... Dew point temperature detector, 8
...Temperature detector.

Claims (1)

[Scope of Claims] 1. A heating means is provided in the face frame of the conditioned air outlet, and the dew point temperature of the indoor air near the outlet and the temperature of the conditioned air in the duct that supplies conditioned air to the outlet are determined. When the measured temperature of the conditioned air approaches or reaches the dew point temperature, the heating means is turned on, and when the dew point temperature is not reached, the heating means is turned off. A method for preventing dew condensation at an air outlet, characterized in that the temperature of the face frame is always kept above the dew point temperature. 2. A heating means provided on the face frame of the conditioned air outlet, a dew point temperature detector that detects the dew point temperature of the indoor air near the outlet, and a conditioned air in a duct that supplies conditioned air to the outlet. and a temperature difference controller that turns on and off the heating means provided in the face frame according to the temperature difference between the detected dew point temperature and the conditioned air temperature. Features a dew condensation prevention device at the air outlet.