JPH08178403A - Air cooling apparatus - Google Patents

Abstract

PURPOSE: To prevent an outlet from dewing, while maintaining confortableness. CONSTITUTION: An air cooling apparatus is composed of an inlet 20, a heat- exchanger 11 with an electrically operated valve 14, a fan 15 with a variable means 18 for the rate of air flow, an outlet 22 with a detector 21 for blowoff temperature, and a controller 23 which increases the rate of the air flow from the fan 15 by the variable means 18 when it is detected that the blowoff temperature is at a critical temperature for dewing or lower or that blowoff humidity is at a critical humidity for dewing or lower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for cooling a relatively wide space such as an office or a factory.

[0002]

2. Description of the Related Art Conventionally, this type of cooling device has a structure as shown in FIG. That is, the suction port 1, the heat exchanger 4 including the electric valve 2 and the drain pan 3, the blower 5, and the blowout port 7 including the blowout temperature detector 6.
And a control device 8, and the blowout temperature detector 6
The opening degree of the electric valve 2 is adjusted by the control device 8 so that the blowout temperature detected by the heat exchanger 4 becomes the set temperature.
The flow rate of cold water flowing inside was adjusted.

[0003]

However, in such a structure, when the blowout temperature is lower than the dew point temperature around the cooling device, the temperature of the blowout port surface 7b is lower than the dew point temperature by the cool air passing through the blowout port inside 7a. There is a problem that the water drops down and dew drops on the surface 7b of the air outlet to drop water droplets. In particular, if the blowing temperature is set to around 15 ° C to improve comfort, a large amount of dew water will be generated, causing damage to the surroundings. There is also a problem that it is necessary and therefore costly.

Therefore, the present invention is intended to prevent dew condensation at the outlet while maintaining comfort.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a suction port, a heat exchanger having an electric valve, a blower having an air volume changing means, and an outlet temperature detector. An air outlet and a control device for increasing the air volume of the blower by the air volume changing means when it is detected that the air outlet temperature is below the dew condensation limit temperature or the air outlet humidity is above the dew condensation limit humidity.

[0006]

According to the present invention, with the above-described structure, when the blowing temperature detector and the suction absolute humidity detector or the blowing relative humidity detector detect that the blowing temperature is below the dew condensation limit temperature or the blowing humidity is above the dew condensation limit humidity,
The controller adjusts the opening degree of the electric valve so that the blowout temperature does not drop below it, and adjusts the flow rate of the cold water flowing through the heat exchanger. It is possible to increase the amount of airflow and to obtain the same comfort as a low blowout temperature depending on the wind speed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system sectional view of a cooling device according to an embodiment of the present invention, and FIGS. 2 and 3 are system sectional views of a cooling device according to another embodiment of the present invention.

In FIG. 1, 11 is a heat exchanger comprising a coil 12 and fins 13 and equipped with an electric valve 14. Reference numeral 15 is a blower which is composed of a motor 16 and a fan 17 and is provided with an air volume changing means 18 (rotation speed changing device in this embodiment). Reference numeral 19 denotes an exterior body surrounding the heat exchanger 11 and the blower 15. In the present embodiment, a suction port 20 as an opening is provided at the end of the heat exchanger 11 side, and a blow-out temperature detector 21 is provided on the blower 15 side. Outlet 22 with attached
It has each. Reference numeral 23 is a control device that controls the electric valve 14, the air volume changing means 18, and the like.

In the embodiment of FIG. 2, the suction port 20
A suction absolute humidity detector 24 is attached in the vicinity, and in the embodiment of FIG. 3, a blowout relative humidity detector 25 is attached near the blowout port 22.

Next, the operation will be described. The air sucked from the suction port 20 exchanges heat with the cold water flowing through the coil 12 when passing through the fins 13 of the heat exchanger 11, and is cooled. The fan 17 is driven by the motor 16 of the blower 15.
Is pressurized by the rotation of No. 2 and is supplied as cold air from the outlet 22 to people around (in the present embodiment, the lower side).
At this time, the blowout temperature detector 21 controls the blowout port 2
2 The temperature of the cold air passing through the inside is detected, and if the temperature is higher than a preset temperature, the controller 23 controls the electric valve 14
Is increased to increase the flow rate of cold water flowing in the coil 12 of the heat exchanger 11 to increase the heat exchange amount and lower the blowout temperature. Conversely, if the temperature is lower than the preset temperature, The opening degree of the electric valve 14 is reduced to reduce the flow rate of the cold water flowing through the coil 12 of the heat exchanger 11, and the heat exchange amount is reduced to increase the blowout temperature. To control.

In the configuration and operation described above, in the embodiment of FIG. 1, when the blowout temperature detector 21 detects that the blowout temperature is below a predetermined limit temperature at which condensation may occur, the blowout temperature is changed by the controller 23. The opening degree of the electric valve 14 is adjusted so as not to drop below, the flow rate of the chilled water flowing through the coil 12 of the heat exchanger 11 is adjusted, and when a lower set temperature is required, the control device 23 and the air volume are adjusted. In this embodiment, the rotation speed of the motor 16 of the blower 15 is increased by the variable means 18 to increase the fan 17
It increases the amount of air sent by. As a result, the blowing temperature does not fall below the predetermined limit temperature at which dew condensation may occur, so that dew condensation on the surface of the blowing port 22 and water droplets are prevented from dropping, and at the same time, by increasing the wind speed hitting a person, a low blowing temperature can be achieved. It is possible to obtain equal comfort.

In the embodiment of FIG. 2, the dew condensation limit temperature of the blown air can be accurately grasped by detecting the absolute humidity around the cooling device by the suction absolute humidity detector 24, and in the embodiment of FIG. By directly detecting the relative humidity of the blown air with the blowing relative humidity detector 25, the dew point limit humidity near the dew point temperature can be accurately grasped. In either case, the occurrence of dew condensation can be accurately predicted and the dew condensation can be prevented. It is possible to prevent it in advance.

[0013]

INDUSTRIAL APPLICABILITY As described above, the present invention can prevent dew condensation and water droplets from dripping on the surface of the outlet, and can provide the same level of comfort even when a low outlet temperature is required. It is something to do.

Further, it is not necessary to add a new heat insulating material for preventing dew condensation, and the drain pan of the heat exchanger, which is required in the conventional cooling device, is also unnecessary, so that the cost of the device is greatly reduced. It is also possible to achieve the effect.

[Brief description of drawings]

FIG. 1 is a system cross-sectional view of a cooling device according to an embodiment of the present invention.

FIG. 2 is a system cross-sectional view of a cooling device according to another embodiment.

FIG. 3 is a system cross-sectional view of a cooling device according to another embodiment.

FIG. 4 is a system sectional view of a conventional cooling device.

[Explanation of symbols]

 11 Heat Exchanger 14 Electric Valve 15 Blower 18 Air Volume Variable Means 20 Suction Port 21 Blowout Temperature Detector 22 Blowout Port 23 Control Device 24 Suction Absolute Humidity Detector 25 Blowout Relative Humidity Detector

Claims (3)

[Claims] 1. A suction port, a heat exchanger provided with an electric valve, a blower provided with an air flow rate varying means, an outlet provided with an outlet temperature detector, and an outlet provided when the outlet temperature falls below a predetermined limit temperature. A cooling device comprising: a controller for increasing the air volume of the blower by the air volume changing means. 2. A suction port provided with a suction absolute humidity detector, a heat exchanger provided with an electric valve, a blower provided with an air volume changing means, a blow outlet provided with a blowout temperature detector, and a blowout temperature A cooling device comprising: a controller for increasing the air flow rate of the blower by the air flow rate changing means when the temperature falls below a dew condensation limit temperature. 3. Condensation of blowout relative humidity and a blower provided with a heat exchanger having a suction port, an electric valve, an air volume varying means, a blowout temperature detector and a blowout relative humidity detector, and a blowout relative humidity. A cooling device comprising: a controller for increasing the air volume of the blower by the air volume changing means when the humidity exceeds a limit humidity.