JP2017053873A - Method for controlling environment test device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling an environment test device, configured to reduce the amount of ice sticking to heat exchange means during a test and enable a long continuous test without reducing a function of the heat exchange means, even when a test is conducted for a long time while the inside of an environment test chamber is maintained at a low temperature and high humidity.SOLUTION: An environment test device is equipped with: a test chamber 11 having an air duct 12; temperature detection means 22 for detecting a temperature in a test chamber; humidity detection means 23 for detecting a humidity in the test chamber; heat exchange means 21 for adjusting the temperature in the test chamber; and humid air supply means 40 for receiving only the outside air and generating humid air with adjusted temperature and humidity, on the basis of outputs of the temperature detection means 22 and the humidity detection means 23. The method comprises: a test chamber dew point calculation step of determining a dew point of a test chamber 11, on the basis of the outputs of the temperature detection means 22 and the humidity detection means 23; a target dew point calculation step of determining a set temperature of the test chamber 11 and a target dew point based on the set temperature; a dew point deviation calculation step of determining a dew point deviation between a test chamber dew point and the target dew point; and a dew point control step for supplying humid air so that the dew point deviation is reduced.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an environmental test apparatus for maintaining a test room at a set temperature and humidity and testing a specimen in the test room, and a control method for the environmental test apparatus.

  2. Description of the Related Art Conventionally, an environmental test apparatus for testing an automobile in a test chamber that reproduces various environmental conditions is for adjusting a temperature of a test chamber having a blow duct for circulating air and the temperature of the air in the test chamber to a set temperature. And a humidifier for humidifying the air in the test chamber (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 5-289898 (2nd page, FIG. 1)

  In the case of performing a test while maintaining the test chamber at a low temperature and high humidity using the technique disclosed in Patent Document 1, the temperature in the test chamber is set to a set temperature by a cooler maintained at a temperature lower than the set temperature. The high-temperature water vapor is sprayed from the humidifier into the test chamber in the form of a mist to maintain the test chamber at high humidity. However, mist of water vapor sprayed from a humidifier into a low-temperature test chamber is partly taken into the air in the test chamber and used to maintain the test chamber at high humidity. The state changes from water to water and from water to ice in a short time, becomes fine ice particles, circulates in the test room with the air flow in the test room, and gradually adheres to the cooler in the low temperature state. After a lapse of time, there is a problem that a large amount of ice adheres to the cooler, causing a decrease in the function of the cooler and making it difficult to perform a long-term continuous test of the automobile.

  The present invention has been made paying attention to such problems, and adheres to the heat exchanging means during the test even when the environmental test chamber is maintained at a low temperature and high humidity for a long time test. An object of the present invention is to provide an environmental test apparatus and a control method for the environmental test apparatus that can perform a continuous test for a long time without reducing the amount of ice and causing a deterioration in the function of the heat exchange means.

In order to solve the above-mentioned problem, the environmental test apparatus of the present invention provides:
A test chamber having an air duct for circulating air, temperature detection means for detecting the temperature in the test chamber, humidity detection means for detecting humidity in the test chamber, and for adjusting the temperature in the test chamber An environmental test apparatus for performing a test by installing a specimen in the test chamber,
The difference between the amount of water vapor contained in the air in the test chamber obtained based on the outputs of the temperature detecting means and the humidity detecting means and the target water vapor amount determined based on the set temperature and set humidity of the test chamber is It is characterized by comprising humid air supply means for supplying humid air whose humidity is adjusted to be small.
According to this feature, the humid air supply means supplies the humid air whose humidity is adjusted so that it does not exceed 100% humidity, so it is difficult for icing to occur in the test chamber, and it is kept at low temperature and high humidity. Even when the test is performed for a long time, the amount of ice adhering to the heat exchanging means can be reduced, so that the function of the heat exchanging means can be maintained and the continuous test can be performed for a long time.

The environmental test apparatus of the present invention
The humid air supply means takes in outside air and adjusts the temperature and humidity of the outside air to generate humid air.
According to this feature, the humid air supply means generates humid air by adjusting the temperature and humidity of the taken-in outside air, so that moisture in the outside air can be used, and a large amount of humid air can be easily generated. it can.

The environmental test apparatus of the present invention
The humid air supply means is provided between an air intake unit for taking in air and a first humid air supply unit for supplying humid air to the test chamber, and is connected to the air intake unit to adjust the temperature. And a temperature / humidity adjusting means having a humidifying source for adjusting the humidity and a dehumidifying means connected to the first humid air supply unit and adjusting the humidity by a moisture absorbing member.
According to this feature, the temperature and humidity of the air can be adjusted over a wide range by the temperature / humidity adjusting means and the dehumidifying means provided between the air intake part and the air supply part.

The environmental test apparatus of the present invention
A first water vapor supply unit for supplying water vapor to a humidification source of the temperature / humidity adjusting unit; and a second water vapor supply unit for supplying water vapor to a test chamber humidification unit installed in the air duct, It is characterized by comprising a water vapor switching means for switching the water vapor supply by the first water vapor supply unit or the second water vapor supply unit.
According to this feature, the environmental test apparatus can adjust the humidity of the test chamber by the temperature / humidity adjusting means, or can switch the water vapor switching means and humidify the test chamber by the test chamber humidifying means. Can be adjusted.

The environmental test apparatus of the present invention
The humid air supply unit supplies the humid air from the temperature / humidity adjusting unit to the first humid air supply unit, and supplies the humid air from the temperature / humidity adjusting unit to the dehumidifying unit. A third humid air supply unit, and further comprises a humid air switching means for switching the humid air by the second humid air supply unit or the third humid air supply unit.
According to this feature, the humid air supply means can generate the humid air by the temperature / humidity adjusting means, or can switch the humid air switching means to generate the humid air by the temperature / humidity adjusting means and the dehumidifying means. The conditioned air can be generated.

The control method of the environmental test apparatus of the present invention is:
A ventilation duct for circulating the air in the test chamber in which the specimen is installed, temperature detection means for detecting the temperature in the test chamber, humidity detection means for detecting the humidity in the test chamber, and temperature in the test chamber And a heat exchange means for adjusting the temperature, a humidity control means having a heat exchanger for adjusting the temperature and a humidifying source for adjusting the humidity, and a humidity absorbing member. A dehumidifying means for adjusting, and based on outputs of the temperature detecting means and the humidity detecting means, the apparatus includes a humid air supply means for taking in only the outside air and generating humid air in which the temperature and humidity of the outside air are adjusted, A test room dew point calculation step for obtaining a dew point of the test room based on the outputs of the temperature detection means and the humidity detection means, and a target dew point calculation for obtaining a target dew point based on the set temperature and the set humidity of the test room. And degree, and the dew point deviation calculation step of obtaining a dew point deviation between the target dew point and the laboratory dew point, characterized in that and a dew point control step of supplying the humid air to the dew point difference is reduced.
According to this feature, the test room has a dew point deviation between the dew point of the test room based on the outputs of the temperature detection means and the humidity detection means and the target dew point based on the set temperature and set humidity of the test room. The humidity is controlled to the set value, so even if the test is performed for a long time while maintaining low temperature and high humidity, the amount of ice adhering to the heat exchanging means can be reduced. Can be maintained for a long time.

The control method of the environmental test apparatus of the present invention is:
In the dew point control step, the dew point of the humid air supplied from the humid air supply means is controlled.
According to this feature, the humid air supply means supplies the humid air whose dew point is controlled so that the dew point deviation is small, so that the humidity in the test chamber can be easily adjusted to the set humidity.

1 is an overall configuration diagram showing an environmental test apparatus according to the present invention. It is a figure which shows the control block diagram of a temperature / humidity control means.

  An embodiment for carrying out an environmental test apparatus according to the present invention will be described below with reference to FIGS. 1 and 2. In the following description, the right side in FIG. 1 is described as the front side of the apparatus, the left side is the rear side, and the vertical direction is described as the top and bottom of the apparatus (or the ceiling surface and the floor surface).

  As shown in FIG. 1, an environmental test apparatus 10 according to the present invention includes an environmental test chamber 11 as a test chamber having an air duct 12 for circulating air, and a temperature for detecting the temperature in the environmental test chamber 11. Humidity of the test chamber connected to the detection means 22, the humidity detection means 23 for detecting the humidity in the environmental test chamber 11, the heat exchange means 21 for adjusting the temperature in the environmental test chamber 11, and the water vapor supply means 30 A humidifying nozzle 31 as a test chamber humidifying means, a humidifying means 30 for humidifying the inside of the environmental test chamber 11, a steam supply means 30 and an air intake pipe 40a as an air intake portion for taking in air such as outside air are connected to the environment. Humid air supply means 40 for supplying humid air to the test chamber 11. Hereinafter, the components constituting the environmental test apparatus 10 will be described.

  The environmental test chamber 11 has an air intake 15 formed in the front wall 11a for taking in air, and a ceiling surface for discharging the air sent from the air intake 15 to the environmental test chamber 11 to the air duct 12. The exhaust port 16 formed in the rear part of 11b is provided.

  The air duct 12 has an opening 12a side at one end connected to the air intake 15 of the environmental test chamber 11 and an opening 12b side of the other end connected to the exhaust port 16 so that the upper side of the environmental test chamber 11 can be seen. It is arranged so as to surround it, and the air in the environmental test chamber 11 can be circulated by the blower 20.

  Further, in the environmental test chamber 11, an entrance / exit 14 for taking in / out the automobile V as a specimen into / from the environmental test chamber 11, an openable / closable door 17 provided in the entrance / exit 14, and an exhaust port 16 are provided. A movable corner vane 18 that guides the air flow in the environmental test chamber 11 to the exhaust port 16 side is disposed on the lower side. The movable corner vane 18 can be moved when the vehicle V is taken in and out of the environmental test chamber 11, and is provided so as not to prevent the movement of the vehicle V.

  Further, corner vanes 19a, 19b, 19c are provided in the middle of the air duct 12, and play the role of preventing the drift of the air circulating with the movable corner vane 18 and reducing the pressure loss. In FIG. 1, movable corner vanes 18 and corner vanes 19a, 19b, 19c are provided at each corner, but the number of movable corner vanes and corner vanes may be increased or decreased as necessary.

  The floor portion of the environmental test chamber 11 is provided with a chassis dynamometer 25 that can rotatably support the driving wheel of the vehicle V in a fixed state, and a running test of the vehicle V can be performed in the environmental test chamber 11. it can. Further, an exhaust pipe 26 is provided so that the exhaust gas of the automobile V can be discharged out of the environmental test chamber 11.

  The air duct 12 is provided with heat exchange means 21 for adjusting the temperature of the air in the environmental test chamber 11 to a set temperature. In the heat exchanging means 21, a heat exchanging fluid adjusted to a temperature corresponding to the set temperature of the environmental test chamber 11 is circulated. The air flowing through the air duct 12 is adjusted so that the environment test chamber 11 has a set temperature by passing through the heat exchanging means 21. The flow rate of the air circulating in the environmental test chamber 11 can be adjusted by controlling the rotational speed of a damper or the blower 20 (not shown).

  Further, the air duct 12 is provided with a humidifying nozzle 31 as a test chamber humidifying means and a humid air supply means 40 in order to keep the inside of the environmental test chamber 11 at a set humidity. The humidifying nozzle 31 is used when reproducing the high temperature and high humidity in the environmental test chamber 11 or when the surface temperature of the heat exchanging means 21 is adjusted to 0 ° C. or higher and the heat exchanging means 21 is less likely to freeze. It is mainly used for humidity adjustment, and high-temperature water vapor is sprayed into the air duct 12 from the humidifying nozzle 31 to adjust the humidity in the environmental test chamber 11 to a substantially saturated state. On the other hand, the humid air supply means 40 is mainly used when adjusting the humidity in a low temperature state where the surface temperature of the heat exchange means 21 is set to 0 ° C. or less.

  Hereinafter, the humidifying nozzle 31 for humidifying the inside of the environmental test chamber 11 and the humid air supply means 40 for supplying humid air to the environmental test chamber 11 will be described.

  As shown in FIG. 1, the humidifying nozzle 31 is connected to a steam supply pipe 30 that is connected to a high-temperature steam generating means (not shown). The steam supply pipe 30 is a steam supply pipe 30b serving as a first steam supply section that supplies steam to the humidification source 44 of the temperature / humidity adjusting means 42, and a steam serving as a second steam supply section that supplies steam to the humidification nozzle 31. A supply pipe 30c, and valves 30g and 30h as water vapor switching means for switching water vapor supply by the water vapor supply pipe 30b or the water vapor supply pipe 30c are provided.

  Here, when the inside of the environmental test chamber 11 is tested under the conditions of low temperature, high humidity, and high wind speed, in order to prevent freezing due to powerful cooling of the humidifying nozzle 31, it is always more than a certain amount. It is necessary to keep warm by flowing high-temperature steam. However, since the amount of water vapor for keeping the humidifying nozzle 31 warm is much larger than the amount of water vapor for keeping the inside of the environmental test chamber 11 at the set humidity, the excessively sprayed water vapor changes its state into fine ice, This fine ice circulates on the air flow in the environmental test chamber 11 and the ice gradually adheres to the heat exchange means 21 in a low temperature state. As a result, a large amount of ice enters the heat exchange means 21 after a long time. In some cases, the adhesion of the heat exchanger 21 may cause a decrease in the function of the heat exchanging means 21, and the vehicle V may not be able to be continuously tested for a long time.

  As a countermeasure, the amount of ice adhering to the heat exchange means 21 is reduced by reducing the difference between the set temperature in the environmental test chamber 11 and the temperature of the refrigerant supplied to the heat exchange means 21 to 5 ° C. or less. However, depending on the conditions, the amount of ice attached to the heat exchange means 21 may not be sufficiently reduced.

  Therefore, the environmental test apparatus of the present invention uses the humidifying nozzle 31 when the surface temperature of the heat exchange means 21 is set to 0 ° C. or lower and the environmental test chamber is tested under conditions of low temperature and high humidity. Instead, the humid air is supplied from the humid air supply means 40 into the environmental test chamber 11, and the humidity in the environmental test chamber 11 can be adjusted to the set humidity by the water vapor contained in the humid air. Further, the humid air supply means 40 includes a temperature / humidity adjusting means 42 and a dehumidifying means 46 so that the humidity range can be adjusted over a wide range. Hereinafter, the temperature / humidity adjusting means 42 and the dehumidifying means 46 constituting the humid air supply means 40 will be described.

  The temperature / humidity adjusting means 42 is provided to generate and supply humid air by adjusting the temperature and humidity of air taken in from the outside to predetermined values. The temperature / humidity adjusting means 42 is connected to the outside, and an air intake pipe 40a as an air intake section for taking in air such as outside air, an intake 41a connected to the air intake pipe 40a, and a sending out of the generated humid air A casing 41 having an outlet 41b includes a heat exchanger 43, a humidification source 44 connected to the water vapor supply pipe 30b, and a blower 45 in order from the intake 41a side. The heat exchanger 43 is supplied with a refrigerant from the outside, and adjusts the air taken in from the intake 41a to a predetermined temperature. The outside air adjusted to a predetermined temperature becomes substantially saturated humid air by the high-temperature steam sprayed from the humidification source 44, and the humid air is sent out from the outlet 41b by the blower 45.

  The temperature / humidity adjusting means 42 adjusts the temperature of the air by changing the temperature of the refrigerant supplied to the heat exchanger 43 and causes the temperature-adjusted air to take in the water vapor amount to a level that is substantially saturated. Thus, the amount of water vapor contained in the air can be controlled. Further, since the temperature of the refrigerant supplied to the heat exchanger 43 of the temperature / humidity adjusting means 42 is 0 ° C. or higher and the heat exchanger 43 does not freeze, the amount of water vapor supplied from the humidification source 44 is adjusted by throttling. Thus, unsaturated humid air can be generated.

  The dehumidifying unit 46 dehumidifies the humid air supplied from the temperature / humidity adjusting unit 42 and adjusts the humid air having a low humidity to a medium humidity. The dehumidifying means 46 includes a casing 47 having a humid air inlet 47a, a dehumidified air outlet 47b, a regenerating air inlet 47c, and a regenerating air outlet 47d, a precooler 48, and a dehumidifying member as a moisture absorbing member that rotates at a constant speed. A rotor 49 and a regenerative heater 50 are provided.

  The dehumidifying rotor 49 of the dehumidifying means 46 has a moisture absorbent that absorbs moisture, a dehumidifying zone 46 a that dehumidifies the air passing through the dehumidifying rotor 49, and a regeneration zone 46 b that regenerates the dehumidifying rotor 49 that has absorbed moisture. The dehumidification cycle and the regeneration cycle are performed continuously at a constant speed. The dehumidifying zone 46 a takes in the humid air sent from the outlet 41 b of the temperature / humidity adjusting means 42 from the humid air inlet 47 a, adjusts the humid air to a predetermined temperature by the precooler 48, and then sends it to the dehumidifying rotor 49. The dehumidified humid air is sent to the dehumidified air outlet 47b. The regeneration zone 46b heats the air taken in from the regeneration air inlet 47c by the regeneration heater 50, the heated air evaporates the moisture adsorbed in the dehumidification rotor 49, and the heated air that has taken in the moisture is the regeneration air exhaust. It is discharged from the outlet 47d. Note that the humidity of the humid air dehumidified by the dehumidifying means 46 can be controlled by adjusting the heating temperature of the regenerative heater 50.

  Here, the humidification nozzle 31 and the humid air supply means 40 can be independently operated. When the humidifying nozzle 31 is used, the valve 30h of the water vapor supply pipe 30c is opened, the valve 30g of the water vapor supply pipe 30b is closed, and high-temperature water vapor is sprayed from the humidifying nozzle 31 into the air duct 12. The chamber 11 is humidified. On the other hand, when the humid air supply means 40 is used, the valve 30h of the water vapor supply pipe 30c is closed, the valve 30g of the water vapor supply pipe 30b is opened, and high-temperature water vapor is sprayed from the humidification source 44 into the casing 41. The humidity in the test chamber can be adjusted over a wide range.

  Further, the humid air supply means can supply humid air whose temperature and humidity are adjusted over a wide range by a single operation by the temperature / humidity adjustment means 42 and a combined operation by the temperature / humidity adjustment means 42 and the dehumidification means 46.

  Here, when the inside of the environmental test chamber 11 is tested under conditions of low temperature and high humidity, only the temperature / humidity adjusting means 42 is used without using the dehumidifying means 46 of the humid air supplying means 40. Specifically, the valve 30h provided in the water vapor supply pipe 30c is closed, the valve 40g as the humid air switching means provided in the air supply pipe 40c as the third humid air supply unit is closed, and the second A valve 40h serving as a humid air switching means disposed in an air supply pipe 40e serving as a humid air supply unit is opened, and the humid air generated by the temperature / humidity adjusting means 42 is supplied from the outlet 41b to the air supply pipe 40e, the first Then, the air is supplied into the air duct 12 from the humid air supply port 12c provided in the air duct 12 via the air supply pipe 40j as the humid air supply section, and the inside of the environmental test chamber 11 is adjusted to the set humidity.

  On the other hand, when the inside of the environmental test chamber 11 is tested under conditions of low temperature and medium humidity, both the temperature / humidity adjusting means 42 and the dehumidifying means 46 are used. Specifically, the valve 30h of the water vapor supply pipe 30c is closed, the valve 40g of the air supply pipe 40c is opened, the valve 40h of the air supply pipe 40e is closed, and the air supplied from the air intake pipe 40a is adjusted to the temperature / humidity adjusting means. At 42, substantially saturated humid air having a predetermined temperature is generated, and the humid air is further adjusted to a target humidity by the dehumidifying means 46. Then, humid air adjusted to the target temperature and humidity is supplied into the air duct 12 from the humid air supply port 12c through the air supply pipe 40f and the air supply pipe 40j, and the humidity set in the environmental test chamber 11 is set. Adjust to.

  As shown in FIG. 1, the air intake 15 of the environmental test chamber 11 is provided with a temperature detecting means 22 and a humidity detecting means 23 for detecting the temperature and humidity in the environmental test chamber 11. The temperature Tc and humidity Hc in the test chamber detected by the temperature detection means 22 and the humidity detection means 23 are sent to the temperature / humidity control means 60. The temperature / humidity control means 60 detects the temperature and humidity in the environmental test chamber 11, and controls the humid air supply means 40 so that the detected temperature and humidity become the temperature and humidity set according to the conditions. I have control. The temperature / humidity control means 60 may be provided in the humid air supply means 40 or may be provided outside the humid air supply means 40.

  FIG. 2 shows a control block diagram of the temperature / humidity control means 60. The temperature / humidity control means 60 takes in the temperature Tc and the humidity Hc in the test chamber detected by the temperature detection means 22 and the humidity detection means 23, and represents the amount of water vapor contained in the air per unit mass in the environmental test chamber 11. The target dew point Dpd is obtained from the dew point calculation unit 63 for obtaining the room dew point Dpc, the setting unit 61 for inputting and setting the set temperature Td and set humidity Hd of the environmental test chamber 11 from the outside, and the set temperature Td and set humidity Hd. A target dew point setting unit 62 and a deviation calculating unit 64 for obtaining a deviation ΔDp between the laboratory dew point Dpc and the target dew point Dpd are provided. The temperature / humidity control means 60 controls the humid air supply means 40 so that the dew point deviation ΔDp between the test room dew point Dpc and the target dew point Dpd becomes small, and the humid air is supplied from the humid air supply means 40 to the environmental test chamber 11. Supply.

  As shown in FIG. 2, the temperature / humidity control means 60 reduces the dew point deviation ΔDp between the test room dew point Dpc and the target dew point Dpd by dew point control, air volume control, and regeneration temperature control of the humid air supply means 40. Moist air can be generated.

  Specifically, the dew point control of the humid air supply means 40 by the temperature / humidity control means 60 controls the temperature of the refrigerant supplied to the heat exchanger 43 of the humid air supply means 40, and the amount of water vapor corresponding to the target humidity By adjusting the temperature of the air so that the dew point temperature includes the amount of water vapor until the water vapor amount is almost saturated in the air adjusted to the dew point temperature, the amount of water vapor contained in the humid air is controlled to the target value. is there.

  The rotational speed control of the humid air supply means 40 by the temperature / humidity control means 60 controls the rotational speed of the blower 45 of the temperature / humidity adjustment means 42 instead of changing the dew point of the humid air generated by the humid air supply means 40. The amount of steam supplied to the environmental test chamber 11 may be controlled by changing the air volume of the humid air generated by the temperature / humidity adjusting means 42.

  The regeneration temperature control of the humid air supply unit 40 by the temperature / humidity control unit 60 is a control performed when the environment test chamber 11 is tested under conditions of low temperature and low humidity, and is generated by the temperature / humidity adjustment unit 42. The humidity of the humid air passing through the rotor 49 is controlled by supplying saturated humid air to the dehumidifying means 46 and adjusting the heating temperature of the regeneration heater 50 of the dehumidifying means 46.

  In the environmental test apparatus of the present invention, the humid air supply means includes the amount of water vapor contained in the air per unit mass determined based on the outputs of the temperature detection means 22 and the humidity detection means 23, the set temperature of the environmental test chamber 11, and Since the humidity in the environmental test chamber 11 is adjusted by the water vapor contained in the humid air so that the deviation from the target water vapor amount determined based on the set humidity becomes small, the test is performed for a long time while maintaining a low temperature and a high humidity. Even in this case, the amount of ice adhering to the heat exchanging means 21 can be reduced, so that the function of the heat exchanging means 21 can be maintained and a continuous test can be performed for a long time.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the temperature / humidity control means 60 is such that the dew point deviation ΔDp between the test room dew point Dpc and the target dew point Dpd is reduced by the dew point control, the air volume control, and the regeneration temperature control of the humid air supply means 40. Moist air was generated. However, the present invention is not limited to this, and at least two of dew point control, rotation speed control, and regeneration temperature control are combined to generate humid air that reduces the dew point deviation ΔDp between the test room dew point Dpc and the target dew point Dpd. Also good.

  Moreover, in the said Example, although the dew point of humid air was controlled, it shows not only this but the mass of the amount of water vapor | steam contained in the air per unit mass based on the output of the temperature detection means 22 and the humidity detection means 23 is shown. The humid air supply means 40 may be controlled so as to generate humid air so that the deviation between the absolute humidity and the target absolute humidity determined based on the set temperature and set humidity of the environmental test chamber 11 is small.

  Further, the switching of the valves 30c, 30g, 40g, and 40h in FIG. 1 may be performed manually, or the temperature / humidity control means 60 is controlled by the temperature / humidity control means according to the set temperature and set humidity of the environmental test chamber 11. Switching may be performed by a command from 60.

  In the above-described embodiment, an automobile has been described as an example of a specimen. However, the specimen is not limited to an automobile, but may be a mechanical device such as an engine, clothes, food, medicines, artificial satellites, animals and plants, and the like.

  Further, in the above embodiment, humid air is generated by adjusting the temperature and humidity by taking in outside air from the outside, but the air taken in for adjustment is not limited to outside air, and is air adjusted and stored in the previous stage. Also good.

  Furthermore, the gas used in the environmental test chamber 11 is not limited to air but may be other gases such as nitrogen, oxygen, and helium.

10 Environmental test equipment 11 Environmental test room (test room)
12 Air duct 21 Heat exchange means 22 Temperature detection means 23 Humidity detection means 30b Water vapor supply pipe (first water vapor supply section)
30c steam supply pipe (second steam supply section)
30h, 30g valve (water vapor switching means)
31 Humidification nozzle 31 (Test room humidification means)
40 Wet air supply means 40a Air intake pipe (air intake part)
40c Air supply pipe (third wet air supply section)
40e Air supply pipe (second wet air supply unit)
40j Air supply pipe (first wet air supply unit)
40j Air supply pipe (air supply part)
40g, 40h Valve (wet air switching means)
42 Temperature / humidity adjusting means 43 Heat exchanger 44 Humidification source 46 Dehumidifying means 49 Dehumidifying rotor (humidity absorbing member)

Claims (5)

A ventilation duct for circulating the air in the test chamber in which the specimen is installed, temperature detection means for detecting the temperature in the test chamber, humidity detection means for detecting the humidity in the test chamber, and temperature in the test chamber A method for controlling an environmental test apparatus comprising:
A temperature / humidity adjusting means having a heat exchanger for adjusting the temperature and a humidifying source for adjusting the humidity, and a dehumidifying means for adjusting the humidity by the moisture absorbing member, based on outputs of the temperature detecting means and the humidity detecting means , Provided with humid air supply means for taking in only the outside air and generating humid air in which the temperature and humidity of the outside air are adjusted,
A laboratory dew point calculating step for obtaining a dew point of the test chamber based on outputs of the temperature detecting means and the humidity detecting means;
A target dew point calculating step for obtaining a target dew point based on the set temperature and set humidity of the test chamber;
A dew point deviation calculating step for obtaining a dew point deviation between the laboratory dew point and the target dew point;
And a dew point control step of supplying the humid air so that the dew point deviation is reduced.   The environmental test apparatus control method according to claim 1, wherein the dew point control step controls a dew point of the humid air supplied from the humid air supply means. When the set humidity is set higher than a predetermined value, the humid air is generated by passing the outside air through the temperature and humidity adjusting means and bypassing the dehumidifying means,
3. The humidified air is generated by passing the outside air in the order of the temperature / humidity adjusting unit and the dehumidifying unit when the set humidity is set to the predetermined value or less. The control method of the environmental test apparatus as described in 1 above.   The control of the environmental test apparatus according to any one of claims 1 to 3, wherein the humid air is supplied to an upstream side of the test chamber and a downstream side of the heat exchange means of the air duct. Method. A humidifying nozzle is provided for supplying water vapor to the air duct based on the outputs of the temperature detecting means and the humidity detecting means,
When the surface temperature of the heat exchange means is set higher than 0 ° C., water vapor is supplied to the air duct by the humidifying nozzle,
When the surface temperature of the heat exchanging means is set to 0 ° C. or lower, the operation of the humidifying nozzle is stopped, and the humid air generated by the humid air generating means is supplied to the air duct. The control method of the environmental test apparatus in any one of Claims 1 thru | or 4.

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