JP2019184518A - Air conditioning system of environmental test room for vehicle - Google Patents

Abstract

To prevent an air conditioner from being affected by the airflow of a vehicle wind speed fan as much as possible when installing the air conditioner in an environmental test room and miniaturizing the environmental test room.SOLUTION: An air conditioning system of an environmental test room for a vehicle in which a dynamometer and a vehicle wind speed fan mounted on the dynamometer for sending a traveling wind to the vehicle are installed indoors includes: an air conditioner which is installed near the vehicle wind speed fan on a ceiling surface of the environmental test room for the vehicle and which has an air conditioning fan generating the airflow in a direction opposite to a wind direction of the vehicle wind speed fan; and a first straightening vane which is a plate-like member arranged on an upper part of the environmental test room for the vehicle and which at least extends from an upper part of a roller for a front wheel of the dynamometer to a bottom of the air conditioner.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioning system for a vehicle environment test room.

  Various test apparatuses are used in automobile development sites (see, for example, Patent Documents 1-3 and Non-Patent Document 1).

JP-A-9-61307 JP 2012-163389 A Japanese Patent Laid-Open No. 55-117938

Hiroshi Ichibashi, “Direct Expansion Air Conditioning System for Automotive Environmental Test Chamber Aiming at Energy Saving”, Japan Society of Refrigerating and Air Conditioning, February 2012, Vol. 87, No. 1012, p. 43-49

  An environmental test room that tests vehicles in a desired environment includes an air conditioner that adjusts the temperature and humidity in the environmental test room, a vehicle wind speed fan that simulates the traveling wind received by the traveling vehicle, and the traveling vehicle from the road surface. A dynamometer that simulates the resistance received and other various devices are provided. In vehicle testing, for example, not only when simulating an environment in a warm region, but also in an extremely low temperature environment such as the Arctic Circle, there is a conventional cooling capacity for air conditioning in an environmental test room. Large air conditioners with large size were used. Large air conditioners require a large installation space and are often installed outside the environmental test room. However, when an air conditioner is installed outside the environmental test room, an air conditioning duct that connects the air conditioner and the environmental test room is required, so loss of air conditioning power due to the ventilation resistance of the duct is inevitable. Arise.

  Therefore, in view of the remarkable performance and energy savings of air conditioners in recent years and the high performance of heat insulating materials that insulate the environmental test room, ducts are omitted by installing air conditioners in the environmental test room, duct ventilation resistance, etc. It is conceivable to reduce the loss of air conditioning power caused by this. However, when the air conditioner is installed in the environmental test chamber, the airflow of the vehicle wind speed fan whose air volume increases or decreases in conjunction with the vehicle speed of the vehicle mounted on the dynamometer may affect the air intake of the air conditioner.

  The present invention has been made in view of such a problem. When the air conditioner is installed in the environmental test chamber and the environmental test chamber is downsized, the influence of the airflow of the vehicle wind speed fan on the air conditioner is affected. The problem is to suppress as much as possible.

  In order to solve the above problems, in the present invention, an air conditioner is installed in the vicinity of a vehicle wind speed fan on the ceiling surface of a vehicle environmental test room, and at least rectification from the top of a front wheel roller of the dynamometer to the bottom of the air conditioner The board was placed at the top of the vehicle environmental test chamber.

Specifically, the present invention relates to an air conditioning system for a vehicle environmental test room in which a dynamometer and a vehicle wind speed fan that sends traveling wind to a vehicle mounted on the dynamometer are installed indoors. An air conditioner having an air conditioning fan that is installed near the vehicle wind speed fan on the ceiling surface and generates an airflow in a direction opposite to the wind direction of the vehicle wind speed fan, and a plate-like member disposed at the top of the vehicle environmental test chamber And at least a first current plate extending from the upper part of the front wheel roller of the dynamometer to the bottom part of the air conditioner.

  If it is said air conditioning system, the 1st baffle installed in the intake side of an air conditioner will prevent the airflow which flowed upwards, hitting vehicles, and will not flow to a vehicle wind speed fan via the air conditioner. Therefore, the intake side of the air conditioner is not easily affected by the airflow generated by the vehicle wind speed fan.

  The ceiling surface of the vehicle environmental test chamber may be a horizontal surface, and the first rectifying plate may be disposed in parallel with the ceiling surface. If the first rectifying plate is installed in this manner in the vehicle environmental test room where the ceiling surface is a horizontal surface, the wind of the vehicle wind speed fan that hits the vehicle flows smoothly to the air conditioner along the ceiling surface. . Therefore, the flow of the airflow toward the air conditioner is stabilized, and the airflow of the vehicle wind speed fan hardly affects the intake air of the air conditioner.

  Further, the first rectifying plate is configured so that the traveling wind sent from the vehicle wind speed fan to the vehicle is such that the air conditioner can control the temperature of the vehicle environment test chamber according to the design conditions of the vehicle environment test chamber. You may have the length which suppresses the quantity which returns to a vehicle wind speed fan, without passing through. Here, the design conditions of the vehicle environmental test room are various conditions required for the vehicle environmental test room in order to appropriately perform the environmental test of the vehicle. Transition time is listed. In order to appropriately control the temperature of the vehicle environment test chamber, it is desirable that the air conditioner appropriately sucks air in the vehicle environment test chamber. In this regard, if the first rectifying plate has the above length, the air conditioner can appropriately suck the air in the vehicle environmental test chamber and air-condition the vehicle environmental test chamber according to the design conditions. It becomes possible.

  If the air conditioning system of the environmental test room for vehicles described above is used, the influence of the airflow of the vehicle wind speed fan on the air conditioner will be as much as possible when the air conditioner is installed in the environmental test room and the environmental test room is downsized. It is possible to suppress it.

FIG. 1 is a schematic diagram showing the overall configuration of a vehicle environmental test chamber. FIG. 2 is a diagram showing the internal structure of the air conditioner. FIG. 3 is a view showing the air conditioner from the air inlet side. FIG. 4 is a diagram showing the internal structure of the vehicle environmental test chamber from the side (left side of the vehicle). FIG. 5 is a diagram showing the internal structure of the vehicle environmental test chamber from above. FIG. 6 is a diagram showing a modification of the air conditioning system. FIG. 7 is a diagram showing a first comparative example of the air conditioning system in the vehicle environmental test room. FIG. 8 is a schematic diagram illustrating the overall configuration of the vehicle environmental test chamber according to the first comparative example. FIG. 9 is a schematic diagram showing the overall configuration of the vehicle environmental test chamber according to the second comparative example. FIG. 10A is a diagram of a simulation result obtained by analyzing the influence on the airflow with respect to the length of the rectifying plate. FIG. 10B is a diagram of a simulation result obtained by analyzing the effect of the current plate. FIG. 10C is a diagram of a simulation result obtained by analyzing an air flow and a temperature distribution when the ceiling height is 8 m in the vehicle environment test chamber corresponding to Comparative Example 2. FIG. 10D is a diagram of a simulation result obtained by analyzing the distribution of airflow and wind speed when the ceiling height is 8 m in the vehicle environment test chamber corresponding to Comparative Example 2. FIG. 10E is a diagram of a simulation result when the ceiling height is 4 m in the vehicle environment test chamber corresponding to Comparative Example 2. FIG. 10F is a diagram of a simulation result when the length of the rectifying plate is 1.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10G is a diagram of a simulation result when the length of the rectifying plate is 2.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10H is a diagram of a simulation result when the length of the rectifying plate is 3.00 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10I is a diagram of a simulation result when the length of the rectifying plate is 3.30 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10J is a diagram of a simulation result when the length of the rectifying plate is 3.30 m in the vehicle environmental test chamber corresponding to the second embodiment. FIG. 10K is a diagram of a simulation result when the length of the current plate is 3.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10L is a diagram of a simulation result when the length of the rectifying plate is 4.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10M is a diagram of a simulation result when the length of the rectifying plate is 5.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10N is a diagram of a simulation result when the length of the rectifying plate is 6.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10O is a diagram of a simulation result when the length of the rectifying plate is 7.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10P is a diagram of a simulation result of the vehicle environmental test chamber corresponding to Comparative Example 1.

  Hereinafter, embodiments of the present invention will be described. Embodiment shown below is an example of embodiment of this invention, and does not limit the technical scope of this invention to the following aspects.

  FIG. 1 is a schematic diagram showing the overall configuration of a vehicle environmental test chamber. The vehicle environment test chamber 1 is a space surrounded by a floor 1F, a ceiling surface 1R, a wall surface 1WF, a wall surface 1WB, a wall surface 1WL, and a wall surface 1WR. The chassis dynamometer facility 2 The vehicle wind speed fan 3 is installed. The chassis dynamometer facility 2 is a device for simulating resistance and the like received from the road surface during traveling of the vehicle 4 to be tested, and includes a roller 2F that supports the front wheels of the vehicle 4 and a roller 2R that supports the rear wheels of the vehicle 4. Have The roller 2F and the roller 2R are configured to interlock with each other via a power transmission mechanism. Even if the vehicle 4 is a front-wheel drive vehicle or a rear-wheel drive vehicle, a roller (roller 2F or roller 2R on the non-drive wheel side). ) Rotates. The vehicle wind speed fan 3 is an electric fan that simulates the traveling wind that the vehicle 4 receives while traveling, and the rotational speed of the motor is controlled by an inverter so that traveling wind with a wind speed that matches the vehicle speed of the vehicle 4 is generated. .

  In the vehicle environment test chamber 1, the chassis dynamometer facility 2 is embedded in the floor 1F in order to prevent the traveling wind generated by the vehicle wind speed fan 3 from being disturbed by the chassis dynamometer facility 2. However, the vehicle environmental test chamber 1 is not limited to the form in which the chassis dynamometer facility 2 is embedded in the floor 1F. The vehicle environment test chamber 1 may have, for example, a small chassis dynamometer facility placed on the floor 1F. Further, the chassis dynamometer facility 2 is provided with rollers 2F and 2R respectively corresponding to both the front wheels and the rear wheels of the vehicle 4, but the chassis dynamometer facility 2 has only rollers corresponding to the drive wheels of the vehicle 4. It may be a simple type provided with.

  The vehicle environment test chamber 1 is provided with an air conditioning system 5. The air conditioning system 5 includes an air conditioner 6 and a current plate 7 (which is an example of a “first current plate” in the present application). The air conditioner 6 is installed in the vicinity of the vehicle wind speed fan 3 in the ceiling surface 1 </ b> R of the vehicle environment test chamber 1, and incorporates an air conditioning fan that generates an airflow in a direction opposite to the wind direction of the vehicle wind speed fan 3. The rectifying plate 7 is a plate member that is horizontally arranged in parallel with the horizontal ceiling surface 1R, and has a length from the upper part of the roller 2F provided in the chassis dynamometer facility 2 to the bottom part of the air conditioner 6.

  The length of the rectifying plate 7 is sent from the vehicle wind speed fan 3 to the vehicle 4 to such an extent that the air conditioner 6 can control the temperature of the vehicle environment test chamber 1 according to the design conditions of the vehicle environment test chamber 1. This is a length that suppresses the amount of traveling wind that returns to the vehicle wind speed fan 3 without passing through the air conditioner 6. The design conditions of the vehicle environmental test chamber 1 are various conditions required for the vehicle environmental test chamber 1 in order to appropriately perform the environmental test of the vehicle 4. For example, the temperature accuracy of the vehicle environmental test chamber 1 (Acceptable temperature error) and transition time (time from changing the set temperature to reaching the set temperature). If the current plate 7 has such a length, the air conditioner 6 appropriately sucks the air in the vehicle environmental test chamber 1 and quickly air-conditions the vehicle environmental test chamber 1 according to the design conditions. It becomes possible.

  FIG. 2 is a diagram showing the internal structure of the air conditioner 6. Moreover, FIG. 3 is the figure which showed the air conditioner 6 from the inlet side. The air conditioner 6 is an air conditioning unit including an air conditioning fan 6A, a humidifying nozzle 6C, an electric heater 6D, a direct expansion coil 6E, and a drain pan 6F. Three air conditioning fans 6 </ b> A are built in the air conditioner 6 in parallel. The electric heater 6D and the direct expansion coil 6E are configured to straddle all the flow paths of the three air conditioning fans 6A. On the other hand, the humidifying nozzle 6C is configured to straddle the flow path of one air conditioning fan 6A among the three air conditioning fans 6A for weight reduction. The electric heater 6D is connected with an electric cable whose energization state is controlled by the control device of the vehicle environment test chamber 1. The direct expansion coil 6E is provided with a refrigerant inlet 6E-in that receives hot gas (compressed refrigerant gas) supplied from the refrigerator and a refrigerant outlet 6E-out that outputs the refrigerant gas to the refrigerator. . The hot gas flowing into the direct expansion coil 6E from the refrigerant inlet 6E-in expands in the direct expansion coil 6E, lowers the coil surface of the direct expansion coil 6E, and cools the air blown from the air conditioning fan 6A.

  The air-conditioning fan 6 </ b> A is preferably one that can withstand the temperature condition of the test environment created in the vehicle environment test chamber 1. In addition, the air conditioning fan 6A preferably has a capability of maintaining a predetermined air volume even under the influence of the airflow by the vehicle wind speed fan 3. For example, when the range of the temperature condition of the test environment created in the vehicle environment test chamber 1 is −40 ° C. to + 25 ° C., a pressure fan having a low-temperature specification motor is suitable as the air conditioning fan 6A.

  It is preferable that the humidifying nozzle 6 </ b> C has the ability to satisfy the humidity condition of the test environment created in the vehicle environment test chamber 1. For example, when the humidity condition range of the test environment created in the vehicle environment test chamber 1 is as wide as 40% to 75%, whether the steam supplied from the humidifier to the humidifying nozzle 6C is small or large, It is preferable to have a nozzle shape in which the vapor is condensed by the humidifying nozzle 6C and hardly drops to the drain pan 6F. In addition, when creating a sub-freezing test environment in the vehicle environment test chamber 1, the humidifying nozzle 6C has a vapor condensing inside so as not to cause damage or blockage due to freezing of water remaining in the humidifying nozzle 6C. Also, it is preferable that the condensed water does not remain inside. As a structure in which condensed water does not remain inside, for example, there is a structure in which a drain outlet for draining condensed water is provided at the lowermost portion of the humidifying nozzle 6C.

FIG. 4 is a view showing the internal structure of the vehicle environmental test chamber 1 from the side (the left side of the vehicle 4). FIG. 5 is a diagram showing the internal structure of the vehicle environmental test chamber 1 from above. As shown in FIG. 4, the rectifying plate 7 is disposed in parallel with the ceiling surface 1 </ b> R and has a length from the top of the roller 2 </ b> F to the bottom of the air conditioner 6. The rectifying plate 7 has a lateral width from the wall surface 1WL to the wall surface 1WR. The rectifying plate 7 is provided with an inspection door 7A for inspecting the inside of the air conditioner 6 from the intake side. The material of the rectifying plate 7 may be any material that can control the airflow and can withstand the wind pressure of the vehicle wind speed fan 3. For example, a metal plate such as stainless steel or aluminum, a resin plate such as acrylic, a heat insulating panel, Punching metal with many holes and other various materials can be applied.

  In addition to the air conditioner 6 and the current plate 7, the air conditioning system 5 includes a control device 8, a refrigerator 9, a cooling tower 10, a humidifier 11, and a dehumidifier 12. The control device 8 is a control device that increases or decreases the air volume of the air conditioning fan 6 </ b> A in proportion to the control amount of the vehicle wind speed fan 3 that increases or decreases the air volume according to the vehicle speed of the vehicle 4. The refrigerator 9 is a refrigerator that supplies the refrigerant to the direct expansion coil 6E, and is connected to the refrigerant inlet 6E-in and the refrigerant outlet 6E-out of the direct expansion coil 6E via a refrigerant pipe. The cooling tower 10 is a cooling tower that supplies cooling water to the refrigerator 9, and is connected to the condenser of the refrigerator 9 through a cooling water pipe. The humidifier 11 is a humidifier that generates steam for humidifying the vehicle environment test chamber 1, and is connected to the humidifying nozzle 6C via a steam pipe. The dehumidifier 12 is a dehumidifier that dehumidifies the vehicle environment test chamber 1, and dehumidifies the air in the vehicle environment test chamber 1 through the intake and exhaust ports provided in the ceiling surface 1R. When the vehicle environmental test chamber 1 is adjusted to a temperature of about minus 40 ° C., for example, even if the room of the vehicle environmental test chamber 1 has a relative humidity of 50%, the room temperature is 25 ° C. The absolute humidity is about 1/300, and since the temperature is extremely low, the condensed water freezes on the surface of the direct expansion coil 6E. Therefore, the dehumidifier 12 is a chemical adsorption type dehumidifier using silica gel or the like.

  FIG. 6 is a view showing a modification of the air conditioning system 5. For example, as shown in FIG. 6, the air conditioning system 5 includes a screen-like rectifying plate 7 </ b> L standing on the left side of the vehicle 4 near the front wheel of the vehicle 4, and the right side of the vehicle 4 near the front wheel of the vehicle 4. A screen-like rectifying plate 7R may be further provided (rectifying plates 7L and 7R are examples of the “second rectifying plate” in the present application). The rectifying plate 7L is a rectifying plate for preventing the wind from the vehicle wind speed fan 3 that hits the vehicle 4 from flowing to the vehicle wind speed fan 3 without passing through the air conditioner 6, and therefore, from the vicinity of the left front wheel of the vehicle 4. It has a width that extends to the wall surface 1WL and a height that extends from the floor 1F to the current plate 7. The rectifying plate 7R is the same as the rectifying plate 7L. The plate surfaces of the rectifying plate 7L and the rectifying plate 7R are inclined obliquely at an angle of about 45 degrees with respect to the direction of the wind blown from the vehicle wind speed fan 3, and from the vehicle wind speed fan 3 hitting the vehicle 4 Are arranged so as to gradually widen the flow path from the front to the rear of the vehicle 4 so that the wind flows smoothly to the rear of the vehicle 4.

  FIG. 7 is a diagram showing a first comparative example of the air conditioning system in the vehicle environmental test room. As an example of an air conditioning system conventionally used in an environmental test room for vehicles, for example, as shown in FIG. 7, there is a system in which an air conditioner is installed in a machine room prepared separately from the environmental test room. When the air conditioner is installed outside the environmental test room, an air conditioning duct that connects the air conditioner and the environmental test room is necessary, and thus loss of air conditioning power due to the ventilation resistance of the duct inevitably occurs. In addition, loss of heat energy through the heat insulating material of the duct and the air conditioner inevitably occurs.

  On the other hand, when the air conditioner 6 is arranged in the vehicle environmental test chamber 1 as in the air conditioning system 5 of the above-described embodiment or modification, a duct that connects the vehicle environmental test chamber 1 and the air conditioner 6 is unnecessary. In addition, there is no loss of heat energy through the insulation material of ducts and air conditioners.

Further, in the air conditioning system 5 of the above-described embodiment or modification, the air conditioning fan 6A is controlled by the control device 8 so that the air volume of the air conditioner 6 is proportional to the air volume of the vehicle wind speed fan 3, so that the chassis dynamometer facility 2 The influence of the airflow of the vehicle wind speed fan 3 whose air volume increases or decreases in conjunction with the vehicle speed of the mounted vehicle 4 on the intake side of the air conditioner 6 is suppressed as much as possible. In other words, the degree of the influence of the airflow between the vehicle wind speed fan 3 and the air conditioner 6 increases as the size of the space in which the vehicle wind speed fan 3 and the air conditioner 6 are installed becomes smaller. Therefore, when the vehicle environment test chamber 1 is relatively small, if the vehicle wind speed fan 3 and the air conditioner 6 independently increase or decrease the air volume, the air intake of the air conditioner 6 becomes unstable. In this regard, in the air conditioning system 5 of the above-described embodiment and the modified example, the air volume of the air conditioner 6 is controlled to be proportional to the air volume of the vehicle wind speed fan 3, so that the intake and exhaust amounts of the vehicle wind speed fan 3 and the air conditioner 6 are It balances and the air intake of the air conditioner 6 is stabilized.

  Since the effects of the air conditioning system 5 of the above embodiment and the modification are verified by simulation, the results are shown below. FIG. 8 is a schematic diagram illustrating the overall configuration of the vehicle environmental test chamber according to the first comparative example. FIG. 9 is a schematic diagram showing the overall configuration of the vehicle environmental test chamber according to the second comparative example. In this verification, as shown in FIG. 8, a comparative example is an air conditioning system in which an air conditioner is provided outside the environmental test room and air-conditions the environmental test room through the intake and exhaust ports provided on the ceiling surface of the environmental test room. (Hereinafter referred to as “Comparative Example 1”). Further, in this verification, as shown in FIG. 9, a comparative example is an air conditioning system in which the rectifying plate 7 is omitted from the air conditioning system 5 and the air conditioner 6 is suspended from the ceiling surface 1 </ b> R of the vehicle environmental test chamber 1. (Hereinafter referred to as “Comparative Example 2”). In this verification, the air conditioning system 5 of the embodiment shown in FIG. 1 is hereinafter referred to as “Example 1”, and the air conditioning system 5 of the modified example shown in FIG. 6 is referred to as “Example 2”.

In this verification, the dimensions of the environmental test chamber, the dimensions of the air conditioner, and the position of the rectifying plate 7 are as follows.
<Dimensions of environmental test room> Depth: about 12m; Width: about 7m; Height: about 4m
<Dimensions of air conditioner> Depth: about 1.6m; Width: about 3m; Height: about 1.2m
<Position of rectifying plate 7> Position about 3m high from the floor

  FIG. 10A is a diagram of a simulation result obtained by analyzing the influence on the airflow with respect to the length of the rectifying plate 7. Each figure of FIG. 10A has shown the simulation result in the vertical cross section of the approximate center of the width direction of a vehicle. Similarly, FIGS. 10C to 10P to be described later show simulation results in a vertical section at the center in the width direction of the vehicle. 10A corresponds to the comparative example 2, and the other figures correspond to the example 1. FIG. In FIG. 10A, “1.85 m”, “2.85 m”, “3.00 m”, “3.30 m”, “3.85 m”, “4.85 m”, “5.85 m”, “6.85 m”. , “7.85 m” is the dimension of the rectifying plate 7 and indicates the length from the top of the roller 2F to the bottom of the air conditioner 6.

  10A, when the wind blown from the vehicle wind speed fan 3 hits the vehicle 4, it flows upward along the hood and windshield of the vehicle 4. However, as can be seen from the view corresponding to Comparative Example 2 described as “None” in FIG. 10A, when the rectifying plate 7 is omitted, the wind that has flowed upward upon hitting the vehicle 4 is at the top of the vehicle 4. It can be seen that the air flows backward and is sucked into the vehicle wind speed fan 3 without passing through the air conditioner 6. On the other hand, in FIG. 10A, “1.85 m”, “2.85 m”, “3.00 m”, “3.30 m”, “3.85 m”, “4.85 m”, “5.85 m”, “6. As can be seen from the drawings corresponding to Example 1 described as “85 m” and “7.85 m”, when the rectifying plate 7 is present, the wind hitting the vehicle 4 does not pass through the air conditioner 6 and the vehicle wind speed. The amount of wind sucked into the fan 3 is suppressed. From this verification result, in the case where the rectifying plate 7 is present, the airflow blown from the vehicle wind speed fan 3 is compared with the case where the rectifying plate 7 is not present, even in a relatively narrow environmental test chamber as described above in terms of dimensions. It can be seen that the short circuit phenomenon sucked into the vehicle wind speed fan 3 again does not occur and the influence of the airflow generated by the vehicle wind speed fan 3 on the intake of the air conditioner 6 is suppressed. For example, the air outlet of the vehicle wind speed fan 3 is separated from the front end of the vehicle 4 by about 1 to 2 m, and the air conditioner 6 is attached near the air outlet of the vehicle wind speed fan 3 as shown in FIG. If so, the optimum length of the rectifying plate 7 is at least 2.85 m or more, more preferably 3.3 m or more. It turns out that generation | occurrence | production of the airflow sucked into the vehicle wind speed fan 3 without going through the machine 6 can be suppressed. If the length of the rectifying plate 7 is about 3.3 m, the rectifying plate 7 may block the illumination light of the vehicle 4 and its surroundings even if lighting is installed on the ceiling surface 1R of the environmental test chamber 1 for vehicles. Almost no.

If the current plate 7 has such a length, a short circuit phenomenon is unlikely to occur in the vehicle wind speed fan 3, so the air conditioner 6 appropriately sucks the air in the vehicle environmental test chamber 1 and The environmental test chamber 1 can be quickly air-conditioned according to the design conditions. The design conditions of the vehicle environment test chamber 1 are, for example, as follows.
<Temperature conditions>
-40 to + 25 ° C ± 2.0 ° C
<Humidity conditions>
40-75% (exercise)
<Transition conditions>
Transition from + 25 ° C. to 0 ° C. (cooling): within 25 minutes Transition from 0 ° C. to −40 ° C. (cooling): within 80 minutes Transition from −40 ° C. to 0 ° C. (heating): within 80 minutes From 0 ° C. Transition to 25 ° C (heating): within 25 minutes

  When the design conditions of the vehicle environment test chamber 1 are defined as described above, for example, the capacity of the air conditioner 6 can be determined as follows. That is, first, based on the specific heat and weight of each material (for example, wall materials and various devices) constituting the vehicle environment test chamber 1, the capacity of the air conditioner 6 among the design conditions of the vehicle environment test chamber 1 is described. Calculate the heat capacity (kJ / h) necessary for satisfying the most required conditions (for example, the shortest transition time and the maximum transition temperature range) for each material. Thereafter, the total value of the heat capacities (W) of all the components is calculated, and the shortest transition time defined by the design conditions of the vehicle environment test chamber 1 is achieved by using a numerical value with some margin added. Therefore, the capacity (heat capacity) of all the air conditioners 6 necessary for the calculation is calculated. Then, the calculated value is divided by the number of air conditioners to calculate the necessary capacity per unit.

  In this way, when the capacity of the air conditioner 6 is set based on the shortest transition time defined by the design conditions of the vehicle environment test chamber 1, if the short circuit phenomenon occurs in the vehicle wind speed fan 3, the vehicle The shortest transition time stipulated by the design conditions of the environmental test room 1 cannot be satisfied. In this regard, if the rectifying plate 7 is provided as in the above-described embodiment, a shortcut in the vehicle wind speed fan 3 is prevented, so there is no need to allow an excessive margin for the capacity of the air conditioner 6 and an inexpensive air conditioner. Can be selected.

  The capacity of the air conditioner 6 is not limited to that determined by the above method. When the design conditions of the vehicle environment test chamber 1 define requirements other than those described above, the capacity of the air conditioner 6 can be determined so as to meet these requirements.

FIG. 10B is a diagram of a simulation result obtained by analyzing the effects of the rectifying plate 7L and the rectifying plate 7R. The simulation result of FIG. 10B is a result of performing a simulation by setting the dimensions of the environmental test chamber and the air flow of the air conditioner and the vehicle wind speed fan to the same conditions as in FIG. 10A. In FIG. 10B, the figure described as “air conditioner system” corresponds to Comparative Example 1, and the figure described as “Ceiling air conditioner system + rectifying plate 3.30 m” corresponds to Example 1. The figure described as “Ceiling-suspended air conditioner system + rectifier plate + screen” corresponds to the second embodiment. As can be seen from the diagram described as “air conditioner system” in FIG. 10B, when there is no rectifying plate 7 as in Comparative Example 1, even if the wind blown from the vehicle wind speed fan 3 hits the vehicle 4, the vehicle 4 It flows diagonally backward on both the left and right sides. However, as can be seen from the figure described as “Ceiling-suspended air conditioner system + rectifying plate 3.30 m” in FIG. 10B, when there is the rectifying plate 7 as in the first embodiment, it blows out from the vehicle wind speed fan 3. When the wind hits the vehicle 4, it flows toward the side of the vehicle 4 on both the left and right sides of the vehicle 4, and part of the airflow flows directly to the vehicle wind speed fan 3 without passing through the air conditioner 6. On the other hand, as can be seen from the diagram described in FIG. 10B as “Ceiling-suspended air conditioner system + rectifier plate + screen”, when there are the rectifier plate 7L and the rectifier plate 7R as in the second embodiment, the vehicle wind speed fan When the wind blown from 3 hits the vehicle 4 and flows to the left and right sides of the vehicle 4, it is guided by the plate surfaces of the rectifying plates 7 </ b> L and 7 </ b> R and flows obliquely rearward on both the left and right sides of the vehicle 4. That is, in the second embodiment, the airflow directly flowing to the vehicle wind speed fan 3 without hitting the air conditioner 6 after hitting the vehicle 4 is blocked by the rectifying plate 7L and the rectifying plate 7R. It can be seen that the generation of airflow sucked into the vehicle wind speed fan 3 can be suppressed without going through.

  Further, when the power of the air conditioning fan is calculated, for example, in the comparative example 1, if the power required for the air conditioning fan is 30 kW, the total power of the six air conditioning fans 6A is 4.5 kW when replaced with the first embodiment. The result of Example 1 was that the power of the air conditioning fan could be reduced by about 85% compared to Comparative Example 1. In addition, when the refrigeration capacity of the refrigerator is estimated, for example, when the refrigeration capacity required for the refrigeration machine is 207 kW in Comparative Example 1, the refrigeration capacity of the refrigeration machine 9 is 190 kW when replaced with the first embodiment. Compared to Comparative Example 1, the refrigeration capacity of the refrigerator can be reduced by about 15%. This is because ducts are not required, so the pressure loss of the air conditioning fan can be reduced, the heat dissipation loss from the air conditioner body and duct to the machine room can be reduced, and the heat capacity of the air conditioner body and duct can be reduced. Conceivable.

  FIG. 10C is a diagram of a simulation result obtained by analyzing the airflow and the temperature distribution when the ceiling height is 8 m in the vehicle environment test chamber corresponding to Comparative Example 2. FIG. 10D is a diagram of a simulation result obtained by analyzing the distribution of airflow and wind speed when the ceiling height is 8 m in the vehicle environment test chamber corresponding to Comparative Example 2. FIG. 10E is a diagram of a simulation result when the ceiling height is 4 m in the vehicle environment test chamber corresponding to Comparative Example 2. 10E shows a simulation result obtained by analyzing the airflow and the temperature distribution, and a figure described as “velocity” in FIG. 10E shows a simulation result obtained by analyzing the airflow and the velocity distribution. Yes. 10C, FIG. 10D, and FIG. 10E, when the ceiling height of the vehicle environment test room is 8 m, the air conditioner 6 and the vehicle wind speed fan 3 are separated from each other compared to the case where the ceiling height is 4 m. Therefore, the airflow flowing toward the air conditioner 6 is difficult to be sucked into the intake port of the vehicle wind speed fan 3. That is, the airflow of the vehicle wind speed fan 3 hardly affects the air conditioner 6. From this, when it is desired to reduce the ceiling height of the environmental test room for vehicles, the airflow of the vehicle wind speed fan 3 affects the air conditioner 6 in the form of Comparative Example 2, and therefore the form of Example 1 and Example 2 is effective. It turns out that it is.

  FIG. 10F is a diagram of a simulation result when the length of the rectifying plate 7 is 1.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10G is a diagram of a simulation result when the length of the rectifying plate 7 is 2.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10H is a diagram of a simulation result when the length of the rectifying plate 7 is 3.00 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10I is a diagram of simulation results when the length of the rectifying plate 7 is 3.30 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10J is a diagram of a simulation result when the length of the rectifying plate 7 is 3.30 m in the vehicle environmental test chamber corresponding to the second embodiment. FIG. 10K is a diagram of a simulation result when the length of the rectifying plate 7 is 3.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10L is a diagram of a simulation result when the length of the rectifying plate 7 is 4.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10M is a diagram of a simulation result when the length of the rectifying plate 7 is 5.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10N is a diagram of a simulation result when the length of the rectifying plate 7 is 6.85 m in the vehicle environmental test chamber corresponding to the first embodiment. FIG. 10O is a diagram of simulation results when the length of the rectifying plate 7 is 7.85 m in the vehicle environmental test chamber corresponding to the first embodiment.

As can be seen from FIG. 10F, when the length of the current plate 7 is about 1.85 m, a part of the wind hitting the vehicle 4 is sucked into the vehicle wind speed fan 3 without passing through the air conditioner 6. I understand that. On the other hand, as can be seen from FIGS. 10G to 10O, when the length of the current plate 7 is 2.85 m or more, the wind hitting the vehicle 4 is sucked into the air conditioner 6 and the vehicle wind speed It can be seen that the airflow of the fan 3 hardly affects the intake air of the air conditioner 6.

  FIG. 10P is a diagram of a simulation result of the vehicle environmental test chamber corresponding to Comparative Example 1. When the air inlet of the air conditioner is on the ceiling as in Comparative Example 1, since the air inlet of the air conditioner is separated from the vehicle wind speed fan 3, the airflow of the car wind speed fan 3 has little influence on the air intake of the air conditioner. It turns out that there is no.

1. ・ Vehicle environment test room: 1F ・ ・ Floor: 1R ・ ・ Ceiling: 1WF, 1WB, 1WL, 1WR ・ ・ Wall: 2 ・ ・ Chassis dynamometer equipment: 2F, 2R ・ ・ Roller: 3 ・ ・ Car Wind speed fan: 4.Vehicle: 5.Air conditioning system: 6.Air conditioner: 6A ... Air conditioning fan: 6C ... Humidification nozzle: 6D ... Electric heater: 6E ... Direct expansion coil: 6F ... Drain pan: 6E-in ··· Refrigerant inlet: 6E-out · · Refrigerant outlet: 7 · · Current plate: 7L · · Current plate: 7R · · Current plate: 7A · · Inspection door: 8 · Control device: 9 · Refrigeration Machine: 10. Cooling tower: 11. Humidifier: 12. Dehumidifier

Claims (3)

An air conditioning system for an environmental test room for a vehicle in which a dynamometer and a vehicle wind speed fan that sends traveling wind to a vehicle mounted on the dynamometer are installed indoors,
An air conditioner having an air conditioning fan installed near the vehicle wind speed fan in the ceiling surface of the vehicle environmental test chamber and generating an airflow in a direction opposite to the wind direction of the vehicle wind speed fan;
A plate-like member disposed at an upper part of the vehicle environmental test chamber, and includes at least a first current plate extending from an upper part of a front wheel roller of the dynamometer to a bottom part of the air conditioner.
Air conditioning system for vehicle environmental test room. The ceiling surface of the vehicle environmental test chamber is a horizontal plane,
The first rectifying plate is disposed in parallel with the ceiling surface.
The air conditioning system of the environmental test room for vehicles according to claim 1. The first rectifying plate is traveled from the vehicle wind speed fan to the vehicle to such an extent that the air conditioner can control the temperature of the environmental test chamber for the vehicle according to the design conditions of the environmental test chamber for the vehicle. Having a length to suppress the amount of wind returning to the vehicle wind speed fan without passing through the air conditioner,
The air conditioning system of the environmental test room for vehicles according to claim 1 or 2.