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They are a series of tubes where fins have been added on the outside to increase the contact area with the outside fluid, to exchange heat and between the fluid inside the tube and the fluid outside the tube.
Finned tube exchangers are known for maximizing heat transfer surface area, by design. Finned tube heat exchangers have tubes with extended outer surface area or fins to enhance the heat transfer rate from the additional area of fins. The fluid surrounding finned tubes maybe process fluid or air.
New vehicle system can project information to front glass dashboard can be retired
Many motorists have had this kind of experience, that is when you look down at the dashboard or mobile phone information, it is very difficult for you to observe the road ahead, and this is very easy to accident. The data shows that when the driver's eyes leave the road ahead, the accident rate of the vehicles they drive will increase by a factor of three.
Now, a company called Navdy has launched a portable device of the same name that can nearly solve this seemingly contradictory problem. Consider a scenario where you see relevant information in your field of vision when you look at driving ahead. This is the solution that Navdy offers.
The San Francisco-based start-up company said: "The Navdy device can transmit transparent images in front of the driver's field of vision, and you will feel that it seems to levitate in the air outside the windshield." Currently the device has begun to accept bookings, The core idea of ​​the design is to try to allow the driver to see the necessary information without having to look away.
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The Navdy device can be attached to the driving dashboard. After installing this device, you no longer have to look down to see those complicated buttons or monitors. The company’s CEO said: “Navdy can be achieved in one step by the driver: the safest and most intuitive solution. You can make calls, use navigation to listen to music or view information and notifications without even having to shift your sight. †  Navdy will provide an app that connects the driver’s iphone or Android phone to the device host. The Navdy projection will be projected according to the settings of the system on the mobile phone, and the relevant information will be displayed in the driver's field of vision. Navdy displays contact information when there is a phone call. The driver can also view the currently playing music information.
According to the design, Navdy is dedicated to relaying and displaying information, and the required operations can be accomplished only by voice or simple gestures. The service provided by this company will hopefully enable the driver to answer the phone while driving, without having to divert the line of sight. There is also a camera on this device to capture the driver's gestures.
Use your hand to wave to the left to answer the phone and swipe to the right to let a notice that you do not want to see disappear from your eyes. Google Voice or Siri is also compatible with this device. You can send microblogs or make phone calls directly. According to the design, the Navdy device is connected to the on-board diagnostic system interface (OBD II)
  The company said: "Do not worry about the battery problem, as long as your car can open, Navdy will be able to work." The current pre-sale stage of the company's pricing for each Navdy system is 299 US dollars, and when the retail officially started, its The price will be 499 US dollars, and it is expected that it will be officially introduced to the market in early 2015. Â