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plants, and animals. This phenomenon is known as a global warming and it is believed to be the result
of the increased in atmospheric greenhouse gases.

Methodology
In designing the prototype of the product, we use an Autodesk Inventor Professional 2010. This
software has a user-friendly interface and very easy to use. This is as our reference to produce a real
prototype in the workshop. Rather than that, with the design parts that we have developed, we can
make a several modification without any problem if it is necessary.
In order to make a performance comparison between the existing product and our design
product, we must have a complete performance result of the existing product that we test by our own.
The method that we use to investigate the performance characteristic is by recording the temperature
inside the car by using a thermometer within a certain time intervals. Then from the temperature that
we obtain, we can determine the rate of heat transfer that takes place within the car and in the same
time we can plot the temperature versus time graph for a comparison purposes. After we have gained
the desired results, we can make a comparison with our designed product to determine which one is
better.
Before we conduct our experiment we must calibrate the temperature sensor first. We will set
up the preset temperature manually by rotating the temperature set point. First we will determine the
suitable preset temperature by referring to the room temperature. To calibrate the temperature sensor,
we will heat up the water temperature to the preset temperature. Then, we will sink the temperature
sensor in the water and rotate the temperature set point slowly until it will switch on the circuit. This
means at the preset level, the temperature sensor will switch on the circuit.
We will measure the temperature by using a digital thermometer to give more accurate result.
The thermometer will be placed inside the vehicle and the temperatures are taken for every 10
minutes interval until one hour. Then the graph of temperature versus time will be set up to analyse
the product performance. From this method, we can observe the performance of our design product.
Theoretically, we will get a higher average temperature for a vehicle without hot air extractor and
lower average temperature for vehicle with hot air extractor. Here, we used average temperature as a
reference since the weather is changing over time and it is not constant.

Figure 1: Flowchart of Testing Process