The purpose of this project is 1) to create a demonstration of loss rate inside the pipe 3 model, equipped with the loss within the surf to 90 degrees. 45 degrees. The reduction and increase the size of pipe. 2) for materials working principle demonstration of loss rate inside the pipe 3 form 3) to determine the quality of the demonstration of rate of flow in pipe 3 format. 4) and the efficiency of demonstration of rate of flow in pipe 3 format. By experts who are experts in a training set of 3. The structural characteristics, the average level of 4.51. Well, the applications, the average level of 4.5. Good and the suitability of application. The average level of 4.05. Good and the maintenance, the average total value 4.8 rated as good, which is consistent with the expert demonstration of loss rate inside the pipe 3 format. It was tested with the samples. This is the first year undergraduate students of mechanical engineering, Faculty of industrial 3 Rajamangala University of technology the airport. The academic year 2558 20 people to the performance. The pre-test and post-test were test and 65.8 85.2 respectively.Therefore, the efficiency of the lesson 80 / 80 criteria for test for the achievement of students, which analyzed to compare the mean score of statistical formula Is a distribution (t-test) values t calculated 19.91 was higher than the critical value at the level of significance 0.05 (1.699). Which shows that the students gain knowledge by using demonstration of air conditioning.
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