JP2602090Y2 - Air temperature setting device for wind tunnel equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air temperature setting device for a wind tunnel facility for setting the temperature of air supplied by a blower to a required temperature in a wind tunnel facility used for automobile testing or the like.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional air temperature setting device for wind tunnel equipment. In this device, a blower 13 is arranged on one side of a duct 11.

[0003] Then, on the blower 13 side of the duct 11,
A cooling coil 15 is arranged, and a heating coil 17 is arranged on the downstream side. A refrigerator 19 is arranged corresponding to the cooling coil 15, and the refrigerator 19 cools the heat medium sent from the cooling coil 15 via the return line 21.

[0004] The cooled heat medium is supplied to the cooling coil 15 through a supply pipe 23. A three-way valve 25 is arranged in the return line 21, and a pump 27 is arranged in the supply line 23.

[0005] A bypass line 29 is provided branching from the downstream side of the pump 27, and the bypass line 29 is connected to the three-way valve 25. On the other hand, a heat exchanger 31 is arranged corresponding to the heating coil 17, and this heat exchanger heats the heat medium sent from the heating coil 17 via the return line 33.

[0006] The heated heat medium is supplied to the heating coil 17 via a supply pipe 35. A three-way valve 37 is arranged in the return line 33, and a pump 39 is arranged in the supply line 35.

[0007] A bypass pipe 41 is provided branching from the downstream side of the pump 39, and the bypass pipe 41 is connected to the three-way valve 37. In the air temperature setting device of the wind tunnel equipment described above, the opening degree of the three-way valve 25 or 37 is controlled,
By controlling the flow rate so that the temperature of the cold or hot water supplied to the cooling coil 15 or the heating coil 17 becomes constant, the temperature of the air supplied by the blower 13 is set to a required predetermined temperature. .

[0008] In the flow control method for controlling the flow rate so that the temperature of the cold or hot water supplied to the cooling coil 15 or the heating coil 17 becomes constant,
High load followability can be obtained.

[0009]

However, such a conventional air temperature setting device for wind tunnel equipment employs a flow rate control method. As shown in FIG. 5, there is a problem that the temperature distribution of the air blown out from the front surface of the cooling coil 15 varies.

That is, in this example, since the supply pipe 23 for supplying the heat medium to the cooling coil 15 is connected to the lower surface of the cooling coil 15,
When the temperature becomes high and the heating coil 17 is not used, the air is finally blown out at this temperature distribution, and it becomes difficult to satisfy the uniformity of the temperature distribution of the air required in the wind tunnel equipment. There was a problem.

The present invention has been made in order to solve such a conventional problem. When the cooling coil is partially loaded, the temperature distribution of the final blown air is greatly reduced without lowering the load followability. It is an object of the present invention to provide an air temperature setting device of a wind tunnel facility that can be made into a wind tunnel.

[0012]

According to the air temperature setting device of the wind tunnel equipment of the present invention, a cooling coil to which a cooling medium is supplied is arranged in a passage of air supplied by a blower, and a downstream side of the cooling coil. In an air temperature setting device of a wind tunnel facility, in which a heating coil to which a heating medium is supplied is provided, a flow rate of supplying the cooling medium to the cooling coil by changing the flow rate while keeping the temperature of the cooling medium constant. And a temperature control means for supplying the heating medium to the heating coil by changing the temperature while keeping the flow rate of the heating medium constant.

[0013]

In the air temperature setting device of the wind tunnel equipment according to the present invention, the supply of the heating medium to the heating coil is performed by a temperature control method in which the flow rate of the heating medium is kept constant and the temperature is changed. The temperature distribution of the air blown from the coil becomes substantially uniform.

Then, when the cooling coil is partially loaded, simply circulating a constant flow rate of the heating medium to the heating coil, the circulating heating medium is equalized by the air from the cooling coil, and the temperature is equalized. When the air from the cooling coil flows through the heating coil in which the heating medium circulates, the temperature distribution of the air from the cooling coil becomes more uniform.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of an air temperature setting device for wind tunnel equipment according to the present invention. In this device, a blower 53 is arranged on one side of a duct 51.

Then, on the blower 53 side of the duct 51,
A cooling coil 55 is arranged, and a heating coil 57 is arranged on the downstream side. A refrigerator 59 is arranged corresponding to the cooling coil 55, and the refrigerator 59 cools the heat medium sent from the cooling coil 55 via the return line 61.

The cooled heat medium is supplied to the cooling coil 55 via the supply pipe 63. A three-way valve 65 is disposed in the return line 61, and a constant flow pump 6 is provided in the supply line 63.
7 are arranged.

A bypass pipe 69 is provided branching from the downstream side of the pump 67, and the bypass pipe 69 is connected to the three-way valve 65. On the other hand, a heat exchanger 71 is arranged corresponding to the heating coil 57, and this heat exchanger heats the heat medium sent from the heating coil 57 via the return line 73.

The heated heat medium is supplied to the heating coil 57 via a supply pipe 75. A three-way valve 77 is disposed in the supply line 75, and a constant flow pump 79 is disposed downstream of the three-way valve 77.

The bypass line 8 branches from the return line 73.
The bypass line 81 is connected to the three-way valve 77. Reference numeral 83 denotes a flow rate control device. The flow rate control device 83 receives a temperature signal from a thermometer 85 disposed at the outlet of the duct 51 and a required set temperature signal S _1, and The opening degree of the three-way valve 65 is controlled so that the air temperature at the outlet of the outlet 51 becomes the set temperature.

The flow rate control device 83 controls the temperature of the heating medium supplied to the cooling coil 55 so as to be constant.
The flow rate is controlled by controlling the opening of the three-way valve 65. Code 89
Indicates a temperature control device.
The temperature signal from the thermometer 85 disposed at the outlet of the duct 51, and inputs the set temperature signal S ₂ that required, so that the air temperature at the outlet of the duct 51 becomes the set temperature, the three-way valve The opening of 77 is controlled.

The temperature control device 89 supplies the heating medium to the heating coil 57 by changing the temperature while keeping the flow rate of the heating medium constant. That is, in this embodiment, the temperature of the heat medium upstream of the three-way valve 77 of the supply pipe 75 subjected to heat exchange in the heat exchanger 71 is, for example, 60 ° C.

The temperature of the heat medium is set by controlling a flow control valve 95 by a control device 93 based on a temperature signal from a thermometer 91 disposed in a supply pipe 75,
The control is performed by controlling the flow rate of the steam on the primary side to be supplied to the fuel cell.

Therefore, when the three-way valve 77 is fully opened, the entire amount of the heat medium exchanged in the heat exchanger 71 flows into the heating coil 57. Therefore, the supply temperature of the heating medium to the heating coil 57 is: For example, the temperature is 60 ° C.

On the other hand, when the heating coil 57 is partially loaded, the three-way valve 77 is not fully opened.
7 and the heat medium from the bypass pipe 81 cooled by the heating coil 57 are mixed together.
7 is supplied.

In the above-described air temperature setting device of the wind tunnel equipment, the supply of the heat medium to the cooling coil 55 is performed by changing the flow rate while keeping the temperature of the heat medium constant. Since the supply of the heat medium is performed by changing the temperature while keeping the flow rate of the heat medium constant, the cooling coil 55
In the case of the partial load, the temperature distribution of the final blown air can be considerably equalized without lowering the load following ability.

That is, in the air temperature setting device of the wind tunnel equipment described above, the supply of the heat medium to the cooling coil 55 is performed by changing the flow rate while keeping the temperature of the heat medium constant. Followability can be obtained.

On the other hand, the supply of the heat medium to the cooling coil 55
Since the flow rate control method is adopted, the temperature distribution of the blown air blown out of the cooling coil 55 when the cooling coil 55 is partially loaded, as shown by the curve a in FIG.
The temperature distribution becomes lower at the lower part and becomes higher at the upper part.
It is possible to reduce by simply circulating a constant flow rate of the heat medium.

That is, as shown in FIG. 3, when the cooling coil 55 is partially loaded, the flow of the heat medium from the heat exchanger 71 of the three-way valve 77 disposed in the supply line 75 of the heating coil 57 is prevented. Then, when the heating medium at a fixed flow rate is simply circulated to the heating coil 57, the circulating heating medium is equalized in temperature by the air from the cooling coil 55, and the heating coil 57 in which the equalized heating medium circulates is When the air from the cooling coil 55 flows, the temperature distribution of the air from the cooling coil 55 becomes as shown by the curve b in FIG. 2, and a more uniform temperature distribution can be obtained.

In the embodiment described above, the three-way valve 6
5, 77, the heat medium on the refrigerator 59 side or the heat exchanger 71
Although the example in which the flow path to the side is set has been described, the present invention is not limited to such an embodiment, and for example, the flow path may be set by a plurality of two-way on-off valves and the like. Of course.

In the embodiment described above, an example in which the heat medium is exchanged by the heat exchanger 71 has been described. However, the present invention is not limited to this embodiment. Needless to say, the medium may be supplied directly.

Further, in the embodiment described above, the example in which the heat medium is cooled by the refrigerator 59 has been described. However, the present invention is not limited to such an embodiment, and for example, the heat medium is cooled by a heat exchanger. Needless to say, cooling may be performed.

Further, in the above-described embodiment, an example was described in which the flow control device 83 and the temperature control device 89 were separately arranged. However, the present invention is not limited to such an embodiment, and the same control is performed. Of course, it may be incorporated in the device.

[0034]

As described above, in the air temperature setting device of the wind tunnel equipment of the present invention, the supply of the cooling medium to the cooling coil is performed by changing the flow rate while keeping the temperature of the cooling medium constant. The heating medium is supplied to the heating coil by changing the temperature while keeping the flow rate of the heating medium constant. There is an advantage that the temperature of the distribution can be significantly equalized than before.

[Brief description of the drawings]

FIG. 1 is a piping system diagram showing an embodiment of an air temperature setting device for wind tunnel equipment of the present invention.

FIG. 2 is an explanatory diagram showing an outlet air temperature distribution of a cooling coil and an outlet air temperature distribution of a heating coil in the air temperature setting device of the wind tunnel equipment of FIG.

FIG. 3 is a piping diagram showing a state in which air is being cooled by an air temperature setting device of the wind tunnel equipment of FIG. 1;

FIG. 4 is a piping diagram showing a conventional air temperature setting device for wind tunnel equipment.

FIG. 5 is an explanatory diagram showing an outlet air temperature distribution of a cooling coil in the air temperature setting device of the wind tunnel equipment of FIG. 4;

[Explanation of symbols]

 53 Blower 55 Cooling coil 57 Heating coil 59 Refrigerator 71 Heat exchanger

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01M 9/04 F24F 5/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A passage for air supplied by a blower,
A cooling coil to which a cooling medium is supplied, and a heating coil to which a heating medium is supplied downstream of the cooling coil. Flow control means for changing the flow rate while keeping the temperature of the cooling medium constant, and temperature control for changing the temperature while keeping the flow rate of the heating medium constant to supply the heating medium to the heating coil. Means for setting the air temperature of a wind tunnel facility.