JAF verifies how to cool down the room which became hot in summer parking, the earliest method is

The hot air inside the car that was parked on a hot day of summer may be unimaginable and I want to lower the temperature inside the car as soon as possible. How is it possible to lower the indoor temperature as fast as possible,Japan Automobile Federation (JAF)I tried 5 ways to verify.

JAF | Eco & Safety | JAF User Test | In-Car Temperature | How do I lower the temperature inside the car at the earliest time during summer parking?
http://www.jaf.or.jp/eco-safety/safety/usertest/temperature/detail5.htm

The test was conducted on May 7, 2016, with five Honda's fittings at Saitama prefecture's Saito Green Park parking lot. When the temperature inside the car reaches 55 degrees, we tried five methods and measured the change in indoor temperature with a temperature sensor installed at the height of the passenger's face at the center of the driver's seat / front passenger seat.


There are five ways to lower the temperature inside the car as follows.

◆ 1: Door opening and closing


A state where only the window of the passenger seat is opened, Opening and closing the door of the driver's seat 5 times to let the hot air inside the car escape, known as "Ito family system"

◆ 2: Cooling spray


Spray a cooling spray on the sheet for about 10 seconds.

◆ 3: Air conditioner fresh air


Can not open the window, set the air conditioner (auto) to "outside air introduction" mode, temperature setting is "Lo (lowest)"

◆ 4: Air-conditioning inside


Without opening the window, set the air conditioner (auto) to "inside air circulation" mode, set the temperature to "Lo (lowest)"

◆ 5: Air conditioning + driving


Open the window fullyThen, run the air conditioner as "outside air introduction" and the temperature setting as "Lo (lowest)".Close the window in 2 minutes, Air conditioner "inside air circulation" and run for 3 minutes.

The result
The temperature change in the five ways is as follows. The most effective thing was "air conditioning + driving". It turned out that the room temperature fell more quickly when running the window with the window fully open than by putting the air conditioner in the stopped state. Although "door opening and closing" has a limitation that there is an effect of lowering the room temperature only while opening and closing the door, the speed of lowering the temperature is a level comparable to "air conditioner + running", so there is an effect That's right. By the way, the most effective thing was "cooling spray".


JAF also tried the method of putting water on the body, but when we sprinkled three cups of water with 8 L bucket, the temperature inside the car dropped only 0.9 degrees and it was not effective. Also, since the cooling spray is flammable, we advise that it is better not to use fire in a car with insufficient ventilation after use.


From the above experiments, JAF is "Since "air conditioner + run" was able to lower the temperature the most quickly, it is most efficient to shut down the inside air circulation by closing the window when the hot air inside the car is released, with the window fully open and the air conditioner being introduced to the outside air It is a wayWe conclude that. However, there seems to be room for further verification because there is no comparison under different conditions, such as what it would be like if the windows are fully opened with no air conditioner in the first place, what happens when the window closing timing is further delayed instead of two minutes .

Also,""Air conditioner + run" can greatly lower the temperature in a short time, so consumption of fuel and exhaust gas are suppressed, and there are also many merits in terms of the environmentAlthough it is said, it feels more "eco" if you use "door opening and closing" in combination before turning on air conditioner and running.

In either case, rather than waiting in a state with the air-conditioner turned on, the conclusion that the room temperature can be lowered quickly and efficiently is better, if the windows are fully opened and finally started running with the air conditioner turned on. JAF said, "Even if the inside temperature drops, heat is accumulated in the steering wheel and the dashboard, the temperature does not go down so much," "By the surface of the child seat that is at high temperature and the metal fittings of the belt , There are cases in which children have burns, so it is important to pay close attention when riding kids etc. "